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From abroekh...@apache.org
Subject svn commit: r1352863 [2/3] - in /incubator/celix/trunk/remote_services: remote_service_admin/private/src/ remote_service_admin_http/ remote_service_admin_http/META-INF/ remote_service_admin_http/private/ remote_service_admin_http/private/include/ remot...
Date Fri, 22 Jun 2012 12:39:57 GMT
Added: incubator/celix/trunk/remote_services/remote_service_admin_http/private/src/mongoose.c
URL: http://svn.apache.org/viewvc/incubator/celix/trunk/remote_services/remote_service_admin_http/private/src/mongoose.c?rev=1352863&view=auto
==============================================================================
--- incubator/celix/trunk/remote_services/remote_service_admin_http/private/src/mongoose.c (added)
+++ incubator/celix/trunk/remote_services/remote_service_admin_http/private/src/mongoose.c Fri Jun 22 12:39:56 2012
@@ -0,0 +1,4258 @@
+// Copyright (c) 2004-2011 Sergey Lyubka
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#if defined(_WIN32)
+#define _CRT_SECURE_NO_WARNINGS // Disable deprecation warning in VS2005
+#else
+#define _XOPEN_SOURCE 600 // For flockfile() on Linux
+#define _LARGEFILE_SOURCE // Enable 64-bit file offsets
+#define __STDC_FORMAT_MACROS // <inttypes.h> wants this for C++
+#endif
+
+#if defined(__SYMBIAN32__)
+#define NO_SSL // SSL is not supported
+#define NO_CGI // CGI is not supported
+#define PATH_MAX FILENAME_MAX
+#endif // __SYMBIAN32__
+
+#ifndef _WIN32_WCE // Some ANSI #includes are not available on Windows CE
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <signal.h>
+#include <fcntl.h>
+#endif // !_WIN32_WCE
+
+#include <time.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <assert.h>
+#include <string.h>
+#include <ctype.h>
+#include <limits.h>
+#include <stddef.h>
+#include <stdio.h>
+
+#if defined(_WIN32) && !defined(__SYMBIAN32__) // Windows specific
+#define _WIN32_WINNT 0x0400 // To make it link in VS2005
+#include <windows.h>
+
+#ifndef PATH_MAX
+#define PATH_MAX MAX_PATH
+#endif
+
+#ifndef _WIN32_WCE
+#include <process.h>
+#include <direct.h>
+#include <io.h>
+#else // _WIN32_WCE
+#include <winsock2.h>
+#define NO_CGI // WinCE has no pipes
+
+typedef long off_t;
+#define BUFSIZ  4096
+
+#define errno   GetLastError()
+#define strerror(x)  _ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10)
+#endif // _WIN32_WCE
+
+#define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \
+      ((uint64_t)((uint32_t)(hi))) << 32))
+#define RATE_DIFF 10000000 // 100 nsecs
+#define EPOCH_DIFF MAKEUQUAD(0xd53e8000, 0x019db1de)
+#define SYS2UNIX_TIME(lo, hi) \
+  (time_t) ((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF)
+
+// Visual Studio 6 does not know __func__ or __FUNCTION__
+// The rest of MS compilers use __FUNCTION__, not C99 __func__
+// Also use _strtoui64 on modern M$ compilers
+#if defined(_MSC_VER) && _MSC_VER < 1300
+#define STRX(x) #x
+#define STR(x) STRX(x)
+#define __func__ "line " STR(__LINE__)
+#define strtoull(x, y, z) strtoul(x, y, z)
+#define strtoll(x, y, z) strtol(x, y, z)
+#else
+#define __func__  __FUNCTION__
+#define strtoull(x, y, z) _strtoui64(x, y, z)
+#define strtoll(x, y, z) _strtoi64(x, y, z)
+#endif // _MSC_VER
+
+#define ERRNO   GetLastError()
+#define NO_SOCKLEN_T
+#define SSL_LIB   "ssleay32.dll"
+#define CRYPTO_LIB  "libeay32.dll"
+#define DIRSEP '\\'
+#define IS_DIRSEP_CHAR(c) ((c) == '/' || (c) == '\\')
+#define O_NONBLOCK  0
+#if !defined(EWOULDBLOCK)
+#define EWOULDBLOCK  WSAEWOULDBLOCK
+#endif // !EWOULDBLOCK
+#define _POSIX_
+#define INT64_FMT  "I64d"
+
+#define WINCDECL __cdecl
+#define SHUT_WR 1
+#define snprintf _snprintf
+#define vsnprintf _vsnprintf
+#define sleep(x) Sleep((x) * 1000)
+
+#define pipe(x) _pipe(x, BUFSIZ, _O_BINARY)
+#define popen(x, y) _popen(x, y)
+#define pclose(x) _pclose(x)
+#define close(x) _close(x)
+#define dlsym(x,y) GetProcAddress((HINSTANCE) (x), (y))
+#define RTLD_LAZY  0
+#define fseeko(x, y, z) fseek((x), (y), (z))
+#define fdopen(x, y) _fdopen((x), (y))
+#define write(x, y, z) _write((x), (y), (unsigned) z)
+#define read(x, y, z) _read((x), (y), (unsigned) z)
+#define flockfile(x) (void) 0
+#define funlockfile(x) (void) 0
+
+#if !defined(fileno)
+#define fileno(x) _fileno(x)
+#endif // !fileno MINGW #defines fileno
+
+typedef HANDLE pthread_mutex_t;
+typedef struct {HANDLE signal, broadcast;} pthread_cond_t;
+typedef DWORD pthread_t;
+#define pid_t HANDLE // MINGW typedefs pid_t to int. Using #define here.
+
+struct timespec {
+  long tv_nsec;
+  long tv_sec;
+};
+
+static int pthread_mutex_lock(pthread_mutex_t *);
+static int pthread_mutex_unlock(pthread_mutex_t *);
+static FILE *mg_fopen(const char *path, const char *mode);
+
+#if defined(HAVE_STDINT)
+#include <stdint.h>
+#else
+typedef unsigned int  uint32_t;
+typedef unsigned short  uint16_t;
+typedef unsigned __int64 uint64_t;
+typedef __int64   int64_t;
+#define INT64_MAX  9223372036854775807
+#endif // HAVE_STDINT
+
+// POSIX dirent interface
+struct dirent {
+  char d_name[PATH_MAX];
+};
+
+typedef struct DIR {
+  HANDLE   handle;
+  WIN32_FIND_DATAW info;
+  struct dirent  result;
+} DIR;
+
+#else    // UNIX  specific
+#include <sys/wait.h>
+#include <sys/socket.h>
+#include <sys/select.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <sys/time.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <netdb.h>
+
+#include <pwd.h>
+#include <unistd.h>
+#include <dirent.h>
+#if !defined(NO_SSL_DL) && !defined(NO_SSL)
+#include <dlfcn.h>
+#endif
+#include <pthread.h>
+#if defined(__MACH__)
+#define SSL_LIB   "libssl.dylib"
+#define CRYPTO_LIB  "libcrypto.dylib"
+#else
+#if !defined(SSL_LIB)
+#define SSL_LIB   "libssl.so"
+#endif
+#if !defined(CRYPTO_LIB)
+#define CRYPTO_LIB  "libcrypto.so"
+#endif
+#endif
+#define DIRSEP   '/'
+#define IS_DIRSEP_CHAR(c) ((c) == '/')
+#ifndef O_BINARY
+#define O_BINARY  0
+#endif // O_BINARY
+#define closesocket(a) close(a)
+#define mg_fopen(x, y) fopen(x, y)
+#define mg_mkdir(x, y) mkdir(x, y)
+#define mg_remove(x) remove(x)
+#define mg_rename(x, y) rename(x, y)
+#define ERRNO errno
+#define INVALID_SOCKET (-1)
+#define INT64_FMT PRId64
+typedef int SOCKET;
+#define WINCDECL
+
+#endif // End of Windows and UNIX specific includes
+
+#include "mongoose.h"
+
+#define MONGOOSE_VERSION "3.1"
+#define PASSWORDS_FILE_NAME ".htpasswd"
+#define CGI_ENVIRONMENT_SIZE 4096
+#define MAX_CGI_ENVIR_VARS 64
+#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
+
+#ifdef _WIN32
+static pthread_t pthread_self(void) {
+  return GetCurrentThreadId();
+}
+#endif // _WIN32
+
+#if defined(DEBUG)
+#define DEBUG_TRACE(x) do { \
+  flockfile(stdout); \
+  printf("*** %lu.%p.%s.%d: ", \
+         (unsigned long) time(NULL), (void *) pthread_self(), \
+         __func__, __LINE__); \
+  printf x; \
+  putchar('\n'); \
+  fflush(stdout); \
+  funlockfile(stdout); \
+} while (0)
+#else
+#define DEBUG_TRACE(x)
+#endif // DEBUG
+
+// Darwin prior to 7.0 and Win32 do not have socklen_t
+#ifdef NO_SOCKLEN_T
+typedef int socklen_t;
+#endif // NO_SOCKLEN_T
+
+typedef void * (*mg_thread_func_t)(void *);
+
+static const char *http_500_error = "Internal Server Error";
+
+// Snatched from OpenSSL includes. I put the prototypes here to be independent
+// from the OpenSSL source installation. Having this, mongoose + SSL can be
+// built on any system with binary SSL libraries installed.
+typedef struct ssl_st SSL;
+typedef struct ssl_method_st SSL_METHOD;
+typedef struct ssl_ctx_st SSL_CTX;
+
+#define SSL_ERROR_WANT_READ 2
+#define SSL_ERROR_WANT_WRITE 3
+#define SSL_FILETYPE_PEM 1
+#define CRYPTO_LOCK  1
+
+#if defined(NO_SSL_DL)
+extern void SSL_free(SSL *);
+extern int SSL_accept(SSL *);
+extern int SSL_connect(SSL *);
+extern int SSL_read(SSL *, void *, int);
+extern int SSL_write(SSL *, const void *, int);
+extern int SSL_get_error(const SSL *, int);
+extern int SSL_set_fd(SSL *, int);
+extern SSL *SSL_new(SSL_CTX *);
+extern SSL_CTX *SSL_CTX_new(SSL_METHOD *);
+extern SSL_METHOD *SSLv23_server_method(void);
+extern int SSL_library_init(void);
+extern void SSL_load_error_strings(void);
+extern int SSL_CTX_use_PrivateKey_file(SSL_CTX *, const char *, int);
+extern int SSL_CTX_use_certificate_file(SSL_CTX *, const char *, int);
+extern int SSL_CTX_use_certificate_chain_file(SSL_CTX *, const char *);
+extern void SSL_CTX_set_default_passwd_cb(SSL_CTX *, mg_callback_t);
+extern void SSL_CTX_free(SSL_CTX *);
+extern unsigned long ERR_get_error(void);
+extern char *ERR_error_string(unsigned long, char *);
+extern int CRYPTO_num_locks(void);
+extern void CRYPTO_set_locking_callback(void (*)(int, int, const char *, int));
+extern void CRYPTO_set_id_callback(unsigned long (*)(void));
+#else
+// Dynamically loaded SSL functionality
+struct ssl_func {
+  const char *name;   // SSL function name
+  void  (*ptr)(void); // Function pointer
+};
+
+#define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr)
+#define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr)
+#define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr)
+#define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr)
+#define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr)
+#define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5].ptr)
+#define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr)
+#define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr)
+#define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr)
+#define SSLv23_server_method (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr)
+#define SSL_library_init (* (int (*)(void)) ssl_sw[10].ptr)
+#define SSL_CTX_use_PrivateKey_file (* (int (*)(SSL_CTX *, \
+        const char *, int)) ssl_sw[11].ptr)
+#define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \
+        const char *, int)) ssl_sw[12].ptr)
+#define SSL_CTX_set_default_passwd_cb \
+  (* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr)
+#define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr)
+#define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr)
+#define SSL_CTX_use_certificate_chain_file \
+  (* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr)
+
+#define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr)
+#define CRYPTO_set_locking_callback \
+  (* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr)
+#define CRYPTO_set_id_callback \
+  (* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr)
+#define ERR_get_error (* (unsigned long (*)(void)) crypto_sw[3].ptr)
+#define ERR_error_string (* (char * (*)(unsigned long,char *)) crypto_sw[4].ptr)
+
+// set_ssl_option() function updates this array.
+// It loads SSL library dynamically and changes NULLs to the actual addresses
+// of respective functions. The macros above (like SSL_connect()) are really
+// just calling these functions indirectly via the pointer.
+static struct ssl_func ssl_sw[] = {
+  {"SSL_free",   NULL},
+  {"SSL_accept",   NULL},
+  {"SSL_connect",   NULL},
+  {"SSL_read",   NULL},
+  {"SSL_write",   NULL},
+  {"SSL_get_error",  NULL},
+  {"SSL_set_fd",   NULL},
+  {"SSL_new",   NULL},
+  {"SSL_CTX_new",   NULL},
+  {"SSLv23_server_method", NULL},
+  {"SSL_library_init",  NULL},
+  {"SSL_CTX_use_PrivateKey_file", NULL},
+  {"SSL_CTX_use_certificate_file",NULL},
+  {"SSL_CTX_set_default_passwd_cb",NULL},
+  {"SSL_CTX_free",  NULL},
+  {"SSL_load_error_strings", NULL},
+  {"SSL_CTX_use_certificate_chain_file", NULL},
+  {NULL,    NULL}
+};
+
+// Similar array as ssl_sw. These functions could be located in different lib.
+static struct ssl_func crypto_sw[] = {
+  {"CRYPTO_num_locks",  NULL},
+  {"CRYPTO_set_locking_callback", NULL},
+  {"CRYPTO_set_id_callback", NULL},
+  {"ERR_get_error",  NULL},
+  {"ERR_error_string", NULL},
+  {NULL,    NULL}
+};
+#endif // NO_SSL_DL
+
+static const char *month_names[] = {
+  "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+  "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+};
+
+// Unified socket address. For IPv6 support, add IPv6 address structure
+// in the union u.
+struct usa {
+  socklen_t len;
+  union {
+    struct sockaddr sa;
+    struct sockaddr_in sin;
+  } u;
+};
+
+// Describes a string (chunk of memory).
+struct vec {
+  const char *ptr;
+  size_t len;
+};
+
+// Structure used by mg_stat() function. Uses 64 bit file length.
+struct mgstat {
+  int is_directory;  // Directory marker
+  int64_t size;      // File size
+  time_t mtime;      // Modification time
+};
+
+// Describes listening socket, or socket which was accept()-ed by the master
+// thread and queued for future handling by the worker thread.
+struct socket {
+  struct socket *next;  // Linkage
+  SOCKET sock;          // Listening socket
+  struct usa lsa;       // Local socket address
+  struct usa rsa;       // Remote socket address
+  int is_ssl;           // Is socket SSL-ed
+  int is_proxy;
+};
+
+enum {
+  CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER,
+  PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, ACCESS_LOG_FILE,
+  SSL_CHAIN_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE,
+  GLOBAL_PASSWORDS_FILE, INDEX_FILES,
+  ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST, MAX_REQUEST_SIZE,
+  EXTRA_MIME_TYPES, LISTENING_PORTS,
+  DOCUMENT_ROOT, SSL_CERTIFICATE, NUM_THREADS, RUN_AS_USER,
+  NUM_OPTIONS
+};
+
+static const char *config_options[] = {
+  "C", "cgi_extensions", ".cgi,.pl,.php",
+  "E", "cgi_environment", NULL,
+  "G", "put_delete_passwords_file", NULL,
+  "I", "cgi_interpreter", NULL,
+  "P", "protect_uri", NULL,
+  "R", "authentication_domain", "mydomain.com",
+  "S", "ssi_extensions", ".shtml,.shtm",
+  "a", "access_log_file", NULL,
+  "c", "ssl_chain_file", NULL,
+  "d", "enable_directory_listing", "yes",
+  "e", "error_log_file", NULL,
+  "g", "global_passwords_file", NULL,
+  "i", "index_files", "index.html,index.htm,index.cgi",
+  "k", "enable_keep_alive", "no",
+  "l", "access_control_list", NULL,
+  "M", "max_request_size", "16384",
+  "m", "extra_mime_types", NULL,
+  "p", "listening_ports", "8080",
+  "r", "document_root",  ".",
+  "s", "ssl_certificate", NULL,
+  "t", "num_threads", "10",
+  "u", "run_as_user", NULL,
+  NULL
+};
+#define ENTRIES_PER_CONFIG_OPTION 3
+
+struct mg_context {
+  volatile int stop_flag;       // Should we stop event loop
+  SSL_CTX *ssl_ctx;             // SSL context
+  char *config[NUM_OPTIONS];    // Mongoose configuration parameters
+  mg_callback_t user_callback;  // User-defined callback function
+  void *user_data;              // User-defined data
+
+  struct socket *listening_sockets;
+
+  volatile int num_threads;  // Number of threads
+  pthread_mutex_t mutex;     // Protects (max|num)_threads
+  pthread_cond_t  cond;      // Condvar for tracking workers terminations
+
+  struct socket queue[20];   // Accepted sockets
+  volatile int sq_head;      // Head of the socket queue
+  volatile int sq_tail;      // Tail of the socket queue
+  pthread_cond_t sq_full;    // Singaled when socket is produced
+  pthread_cond_t sq_empty;   // Signaled when socket is consumed
+};
+
+struct mg_connection {
+  struct mg_connection *peer; // Remote target in proxy mode
+  struct mg_request_info request_info;
+  struct mg_context *ctx;
+  SSL *ssl;                   // SSL descriptor
+  struct socket client;       // Connected client
+  time_t birth_time;          // Time connection was accepted
+  int64_t num_bytes_sent;     // Total bytes sent to client
+  int64_t content_len;        // Content-Length header value
+  int64_t consumed_content;   // How many bytes of content is already read
+  char *buf;                  // Buffer for received data
+  int buf_size;               // Buffer size
+  int request_len;            // Size of the request + headers in a buffer
+  int data_len;               // Total size of data in a buffer
+};
+
+const char **mg_get_valid_option_names(void) {
+  return config_options;
+}
+
+static void *call_user(struct mg_connection *conn, enum mg_event event) {
+  conn->request_info.user_data = conn->ctx->user_data;
+  return conn->ctx->user_callback == NULL ? NULL :
+    conn->ctx->user_callback(event, conn, &conn->request_info);
+}
+
+static int get_option_index(const char *name) {
+  int i;
+
+  for (i = 0; config_options[i] != NULL; i += ENTRIES_PER_CONFIG_OPTION) {
+    if (strcmp(config_options[i], name) == 0 ||
+        strcmp(config_options[i + 1], name) == 0) {
+      return i / ENTRIES_PER_CONFIG_OPTION;
+    }
+  }
+  return -1;
+}
+
+const char *mg_get_option(const struct mg_context *ctx, const char *name) {
+  int i;
+  if ((i = get_option_index(name)) == -1) {
+    return NULL;
+  } else if (ctx->config[i] == NULL) {
+    return "";
+  } else {
+    return ctx->config[i];
+  }
+}
+
+// Print error message to the opened error log stream.
+static void cry(struct mg_connection *conn, const char *fmt, ...) {
+  char buf[BUFSIZ];
+  va_list ap;
+  FILE *fp;
+  time_t timestamp;
+
+  va_start(ap, fmt);
+  (void) vsnprintf(buf, sizeof(buf), fmt, ap);
+  va_end(ap);
+
+  // Do not lock when getting the callback value, here and below.
+  // I suppose this is fine, since function cannot disappear in the
+  // same way string option can.
+  conn->request_info.log_message = buf;
+  if (call_user(conn, MG_EVENT_LOG) == NULL) {
+    fp = conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL :
+      mg_fopen(conn->ctx->config[ERROR_LOG_FILE], "a+");
+
+    if (fp != NULL) {
+      flockfile(fp);
+      timestamp = time(NULL);
+
+      (void) fprintf(fp,
+          "[%010lu] [error] [client %s] ",
+          (unsigned long) timestamp,
+          inet_ntoa(conn->client.rsa.u.sin.sin_addr));
+
+      if (conn->request_info.request_method != NULL) {
+        (void) fprintf(fp, "%s %s: ",
+            conn->request_info.request_method,
+            conn->request_info.uri);
+      }
+
+      (void) fprintf(fp, "%s", buf);
+      fputc('\n', fp);
+      funlockfile(fp);
+      if (fp != stderr) {
+        fclose(fp);
+      }
+    }
+  }
+  conn->request_info.log_message = NULL;
+}
+
+// Return OpenSSL error message
+static const char *ssl_error(void) {
+  unsigned long err;
+  err = ERR_get_error();
+  return err == 0 ? "" : ERR_error_string(err, NULL);
+}
+
+// Return fake connection structure. Used for logging, if connection
+// is not applicable at the moment of logging.
+static struct mg_connection *fc(struct mg_context *ctx) {
+  static struct mg_connection fake_connection;
+  fake_connection.ctx = ctx;
+  return &fake_connection;
+}
+
+const char *mg_version(void) {
+  return MONGOOSE_VERSION;
+}
+
+static void mg_strlcpy(register char *dst, register const char *src, size_t n) {
+  for (; *src != '\0' && n > 1; n--) {
+    *dst++ = *src++;
+  }
+  *dst = '\0';
+}
+
+static int lowercase(const char *s) {
+  return tolower(* (const unsigned char *) s);
+}
+
+static int mg_strncasecmp(const char *s1, const char *s2, size_t len) {
+  int diff = 0;
+
+  if (len > 0)
+    do {
+      diff = lowercase(s1++) - lowercase(s2++);
+    } while (diff == 0 && s1[-1] != '\0' && --len > 0);
+
+  return diff;
+}
+
+static int mg_strcasecmp(const char *s1, const char *s2) {
+  int diff;
+
+  do {
+    diff = lowercase(s1++) - lowercase(s2++);
+  } while (diff == 0 && s1[-1] != '\0');
+
+  return diff;
+}
+
+static char * mg_strndup(const char *ptr, size_t len) {
+  char *p;
+
+  if ((p = (char *) malloc(len + 1)) != NULL) {
+    mg_strlcpy(p, ptr, len + 1);
+  }
+
+  return p;
+}
+
+static char * mg_strdup(const char *str) {
+  return mg_strndup(str, strlen(str));
+}
+
+// Like snprintf(), but never returns negative value, or the value
+// that is larger than a supplied buffer.
+// Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability
+// in his audit report.
+static int mg_vsnprintf(struct mg_connection *conn, char *buf, size_t buflen,
+                        const char *fmt, va_list ap) {
+  int n;
+
+  if (buflen == 0)
+    return 0;
+
+  n = vsnprintf(buf, buflen, fmt, ap);
+
+  if (n < 0) {
+    cry(conn, "vsnprintf error");
+    n = 0;
+  } else if (n >= (int) buflen) {
+    cry(conn, "truncating vsnprintf buffer: [%.*s]",
+        n > 200 ? 200 : n, buf);
+    n = (int) buflen - 1;
+  }
+  buf[n] = '\0';
+
+  return n;
+}
+
+static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen,
+                       const char *fmt, ...) {
+  va_list ap;
+  int n;
+
+  va_start(ap, fmt);
+  n = mg_vsnprintf(conn, buf, buflen, fmt, ap);
+  va_end(ap);
+
+  return n;
+}
+
+// Skip the characters until one of the delimiters characters found.
+// 0-terminate resulting word. Skip the delimiter and following whitespaces if any.
+// Advance pointer to buffer to the next word. Return found 0-terminated word.
+// Delimiters can be quoted with quotechar.
+static char *skip_quoted(char **buf, const char *delimiters, const char *whitespace, char quotechar) {
+  char *p, *begin_word, *end_word, *end_whitespace;
+
+  begin_word = *buf;
+  end_word = begin_word + strcspn(begin_word, delimiters);
+
+  // Check for quotechar
+  if (end_word > begin_word) {
+    p = end_word - 1;
+    while (*p == quotechar) {
+      // If there is anything beyond end_word, copy it
+      if (*end_word == '\0') {
+        *p = '\0';
+        break;
+      } else {
+        size_t end_off = strcspn(end_word + 1, delimiters);
+        memmove (p, end_word, end_off + 1);
+        p += end_off; // p must correspond to end_word - 1
+        end_word += end_off + 1;
+      }
+    }
+    for (p++; p < end_word; p++) {
+      *p = '\0';
+    }
+  }
+
+  if (*end_word == '\0') {
+    *buf = end_word;
+  } else {
+    end_whitespace = end_word + 1 + strspn(end_word + 1, whitespace);
+
+    for (p = end_word; p < end_whitespace; p++) {
+      *p = '\0';
+    }
+
+    *buf = end_whitespace;
+  }
+
+  return begin_word;
+}
+
+// Simplified version of skip_quoted without quote char
+// and whitespace == delimiters
+static char *skip(char **buf, const char *delimiters) {
+  return skip_quoted(buf, delimiters, delimiters, 0);
+}
+
+
+// Return HTTP header value, or NULL if not found.
+static const char *get_header(const struct mg_request_info *ri,
+                              const char *name) {
+  int i;
+
+  for (i = 0; i < ri->num_headers; i++)
+    if (!mg_strcasecmp(name, ri->http_headers[i].name))
+      return ri->http_headers[i].value;
+
+  return NULL;
+}
+
+const char *mg_get_header(const struct mg_connection *conn, const char *name) {
+  return get_header(&conn->request_info, name);
+}
+
+// A helper function for traversing comma separated list of values.
+// It returns a list pointer shifted to the next value, of NULL if the end
+// of the list found.
+// Value is stored in val vector. If value has form "x=y", then eq_val
+// vector is initialized to point to the "y" part, and val vector length
+// is adjusted to point only to "x".
+static const char *next_option(const char *list, struct vec *val,
+                               struct vec *eq_val) {
+  if (list == NULL || *list == '\0') {
+    // End of the list
+    list = NULL;
+  } else {
+    val->ptr = list;
+    if ((list = strchr(val->ptr, ',')) != NULL) {
+      // Comma found. Store length and shift the list ptr
+      val->len = list - val->ptr;
+      list++;
+    } else {
+      // This value is the last one
+      list = val->ptr + strlen(val->ptr);
+      val->len = list - val->ptr;
+    }
+
+    if (eq_val != NULL) {
+      // Value has form "x=y", adjust pointers and lengths
+      // so that val points to "x", and eq_val points to "y".
+      eq_val->len = 0;
+      eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len);
+      if (eq_val->ptr != NULL) {
+        eq_val->ptr++;  // Skip over '=' character
+        eq_val->len = val->ptr + val->len - eq_val->ptr;
+        val->len = (eq_val->ptr - val->ptr) - 1;
+      }
+    }
+  }
+
+  return list;
+}
+
+static int match_extension(const char *path, const char *ext_list) {
+  struct vec ext_vec;
+  size_t path_len;
+
+  path_len = strlen(path);
+
+  while ((ext_list = next_option(ext_list, &ext_vec, NULL)) != NULL)
+    if (ext_vec.len < path_len &&
+        mg_strncasecmp(path + path_len - ext_vec.len,
+          ext_vec.ptr, ext_vec.len) == 0)
+      return 1;
+
+  return 0;
+}
+
+// HTTP 1.1 assumes keep alive if "Connection:" header is not set
+// This function must tolerate situations when connection info is not
+// set up, for example if request parsing failed.
+static int should_keep_alive(const struct mg_connection *conn) {
+  const char *http_version = conn->request_info.http_version;
+  const char *header = mg_get_header(conn, "Connection");
+  return (header == NULL && http_version && !strcmp(http_version, "1.1")) ||
+      (header != NULL && !mg_strcasecmp(header, "keep-alive"));
+}
+
+static const char *suggest_connection_header(const struct mg_connection *conn) {
+  return should_keep_alive(conn) ? "keep-alive" : "close";
+}
+
+static void send_http_error(struct mg_connection *conn, int status,
+                            const char *reason, const char *fmt, ...) {
+  char buf[BUFSIZ];
+  va_list ap;
+  int len;
+
+  conn->request_info.status_code = status;
+
+  if (call_user(conn, MG_HTTP_ERROR) == NULL) {
+    buf[0] = '\0';
+    len = 0;
+
+    // Errors 1xx, 204 and 304 MUST NOT send a body
+    if (status > 199 && status != 204 && status != 304) {
+      len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason);
+      cry(conn, "%s", buf);
+      buf[len++] = '\n';
+
+      va_start(ap, fmt);
+      len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap);
+      va_end(ap);
+    }
+    DEBUG_TRACE(("[%s]", buf));
+
+    mg_printf(conn, "HTTP/1.1 %d %s\r\n"
+              "Content-Type: text/plain\r\n"
+              "Content-Length: %d\r\n"
+              "Connection: %s\r\n\r\n", status, reason, len,
+              suggest_connection_header(conn));
+    conn->num_bytes_sent += mg_printf(conn, "%s", buf);
+  }
+}
+
+#if defined(_WIN32) && !defined(__SYMBIAN32__)
+static int pthread_mutex_init(pthread_mutex_t *mutex, void *unused) {
+  unused = NULL;
+  *mutex = CreateMutex(NULL, FALSE, NULL);
+  return *mutex == NULL ? -1 : 0;
+}
+
+static int pthread_mutex_destroy(pthread_mutex_t *mutex) {
+  return CloseHandle(*mutex) == 0 ? -1 : 0;
+}
+
+static int pthread_mutex_lock(pthread_mutex_t *mutex) {
+  return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
+}
+
+static int pthread_mutex_unlock(pthread_mutex_t *mutex) {
+  return ReleaseMutex(*mutex) == 0 ? -1 : 0;
+}
+
+static int pthread_cond_init(pthread_cond_t *cv, const void *unused) {
+  unused = NULL;
+  cv->signal = CreateEvent(NULL, FALSE, FALSE, NULL);
+  cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL);
+  return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1;
+}
+
+static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) {
+  HANDLE handles[] = {cv->signal, cv->broadcast};
+  ReleaseMutex(*mutex);
+  WaitForMultipleObjects(2, handles, FALSE, INFINITE);
+  return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1;
+}
+
+static int pthread_cond_signal(pthread_cond_t *cv) {
+  return SetEvent(cv->signal) == 0 ? -1 : 0;
+}
+
+static int pthread_cond_broadcast(pthread_cond_t *cv) {
+  // Implementation with PulseEvent() has race condition, see
+  // http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
+  return PulseEvent(cv->broadcast) == 0 ? -1 : 0;
+}
+
+static int pthread_cond_destroy(pthread_cond_t *cv) {
+  return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1;
+}
+
+// For Windows, change all slashes to backslashes in path names.
+static void change_slashes_to_backslashes(char *path) {
+  int i;
+
+  for (i = 0; path[i] != '\0'; i++) {
+    if (path[i] == '/')
+      path[i] = '\\';
+    // i > 0 check is to preserve UNC paths, like \\server\file.txt
+    if (path[i] == '\\' && i > 0)
+      while (path[i + 1] == '\\' || path[i + 1] == '/')
+        (void) memmove(path + i + 1,
+            path + i + 2, strlen(path + i + 1));
+  }
+}
+
+// Encode 'path' which is assumed UTF-8 string, into UNICODE string.
+// wbuf and wbuf_len is a target buffer and its length.
+static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) {
+  char buf[PATH_MAX], buf2[PATH_MAX], *p;
+
+  mg_strlcpy(buf, path, sizeof(buf));
+  change_slashes_to_backslashes(buf);
+
+  // Point p to the end of the file name
+  p = buf + strlen(buf) - 1;
+
+  // Trim trailing backslash character
+  while (p > buf && *p == '\\' && p[-1] != ':') {
+    *p-- = '\0';
+  }
+
+   // Protect from CGI code disclosure.
+   // This is very nasty hole. Windows happily opens files with
+   // some garbage in the end of file name. So fopen("a.cgi    ", "r")
+   // actually opens "a.cgi", and does not return an error!
+  if (*p == 0x20 ||               // No space at the end
+      (*p == 0x2e && p > buf) ||  // No '.' but allow '.' as full path
+      *p == 0x2b ||               // No '+'
+      (*p & ~0x7f)) {             // And generally no non-ascii chars
+    (void) fprintf(stderr, "Rejecting suspicious path: [%s]", buf);
+    wbuf[0] = L'\0';
+  } else {
+    // Convert to Unicode and back. If doubly-converted string does not
+    // match the original, something is fishy, reject.
+    MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
+    WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
+                        NULL, NULL);
+    if (strcmp(buf, buf2) != 0) {
+      wbuf[0] = L'\0';
+    }
+  }
+}
+
+#if defined(_WIN32_WCE)
+static time_t time(time_t *ptime) {
+  time_t t;
+  SYSTEMTIME st;
+  FILETIME ft;
+
+  GetSystemTime(&st);
+  SystemTimeToFileTime(&st, &ft);
+  t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime);
+
+  if (ptime != NULL) {
+    *ptime = t;
+  }
+
+  return t;
+}
+
+static struct tm *localtime(const time_t *ptime, struct tm *ptm) {
+  int64_t t = ((int64_t) *ptime) * RATE_DIFF + EPOCH_DIFF;
+  FILETIME ft, lft;
+  SYSTEMTIME st;
+  TIME_ZONE_INFORMATION tzinfo;
+
+  if (ptm == NULL) {
+    return NULL;
+  }
+
+  * (int64_t *) &ft = t;
+  FileTimeToLocalFileTime(&ft, &lft);
+  FileTimeToSystemTime(&lft, &st);
+  ptm->tm_year = st.wYear - 1900;
+  ptm->tm_mon = st.wMonth - 1;
+  ptm->tm_wday = st.wDayOfWeek;
+  ptm->tm_mday = st.wDay;
+  ptm->tm_hour = st.wHour;
+  ptm->tm_min = st.wMinute;
+  ptm->tm_sec = st.wSecond;
+  ptm->tm_yday = 0; // hope nobody uses this
+  ptm->tm_isdst =
+    GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0;
+
+  return ptm;
+}
+
+static struct tm *gmtime(const time_t *ptime, struct tm *ptm) {
+  // FIXME(lsm): fix this.
+  return localtime(ptime, ptm);
+}
+
+static size_t strftime(char *dst, size_t dst_size, const char *fmt,
+                       const struct tm *tm) {
+  (void) snprintf(dst, dst_size, "implement strftime() for WinCE");
+  return 0;
+}
+#endif
+
+static int mg_rename(const char* oldname, const char* newname) {
+  wchar_t woldbuf[PATH_MAX];
+  wchar_t wnewbuf[PATH_MAX];
+
+  to_unicode(oldname, woldbuf, ARRAY_SIZE(woldbuf));
+  to_unicode(newname, wnewbuf, ARRAY_SIZE(wnewbuf));
+
+  return MoveFileW(woldbuf, wnewbuf) ? 0 : -1;
+}
+
+
+static FILE *mg_fopen(const char *path, const char *mode) {
+  wchar_t wbuf[PATH_MAX], wmode[20];
+
+  to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
+  MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode));
+
+  return _wfopen(wbuf, wmode);
+}
+
+static int mg_stat(const char *path, struct mgstat *stp) {
+  int ok = -1; // Error
+  wchar_t wbuf[PATH_MAX];
+  WIN32_FILE_ATTRIBUTE_DATA info;
+
+  to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
+
+  if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) {
+    stp->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh);
+    stp->mtime = SYS2UNIX_TIME(info.ftLastWriteTime.dwLowDateTime,
+                               info.ftLastWriteTime.dwHighDateTime);
+    stp->is_directory =
+      info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY;
+    ok = 0;  // Success
+  }
+
+  return ok;
+}
+
+static int mg_remove(const char *path) {
+  wchar_t wbuf[PATH_MAX];
+  to_unicode(path, wbuf, ARRAY_SIZE(wbuf));
+  return DeleteFileW(wbuf) ? 0 : -1;
+}
+
+static int mg_mkdir(const char *path, int mode) {
+  char buf[PATH_MAX];
+  wchar_t wbuf[PATH_MAX];
+
+  mode = 0; // Unused
+  mg_strlcpy(buf, path, sizeof(buf));
+  change_slashes_to_backslashes(buf);
+
+  (void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, sizeof(wbuf));
+
+  return CreateDirectoryW(wbuf, NULL) ? 0 : -1;
+}
+
+// Implementation of POSIX opendir/closedir/readdir for Windows.
+static DIR * opendir(const char *name) {
+  DIR *dir = NULL;
+  wchar_t wpath[PATH_MAX];
+  DWORD attrs;
+
+  if (name == NULL) {
+    SetLastError(ERROR_BAD_ARGUMENTS);
+  } else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) {
+    SetLastError(ERROR_NOT_ENOUGH_MEMORY);
+  } else {
+    to_unicode(name, wpath, ARRAY_SIZE(wpath));
+    attrs = GetFileAttributesW(wpath);
+    if (attrs != 0xFFFFFFFF &&
+        ((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) {
+      (void) wcscat(wpath, L"\\*");
+      dir->handle = FindFirstFileW(wpath, &dir->info);
+      dir->result.d_name[0] = '\0';
+    } else {
+      free(dir);
+      dir = NULL;
+    }
+  }
+
+  return dir;
+}
+
+static int closedir(DIR *dir) {
+  int result = 0;
+
+  if (dir != NULL) {
+    if (dir->handle != INVALID_HANDLE_VALUE)
+      result = FindClose(dir->handle) ? 0 : -1;
+
+    free(dir);
+  } else {
+    result = -1;
+    SetLastError(ERROR_BAD_ARGUMENTS);
+  }
+
+  return result;
+}
+
+struct dirent * readdir(DIR *dir) {
+  struct dirent *result = 0;
+
+  if (dir) {
+    if (dir->handle != INVALID_HANDLE_VALUE) {
+      result = &dir->result;
+      (void) WideCharToMultiByte(CP_UTF8, 0,
+          dir->info.cFileName, -1, result->d_name,
+          sizeof(result->d_name), NULL, NULL);
+
+      if (!FindNextFileW(dir->handle, &dir->info)) {
+        (void) FindClose(dir->handle);
+        dir->handle = INVALID_HANDLE_VALUE;
+      }
+
+    } else {
+      SetLastError(ERROR_FILE_NOT_FOUND);
+    }
+  } else {
+    SetLastError(ERROR_BAD_ARGUMENTS);
+  }
+
+  return result;
+}
+
+#define set_close_on_exec(fd) // No FD_CLOEXEC on Windows
+
+static int start_thread(struct mg_context *ctx, mg_thread_func_t f, void *p) {
+  return _beginthread((void (__cdecl *)(void *)) f, 0, p) == -1L ? -1 : 0;
+}
+
+static HANDLE dlopen(const char *dll_name, int flags) {
+  wchar_t wbuf[PATH_MAX];
+  flags = 0; // Unused
+  to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf));
+  return LoadLibraryW(wbuf);
+}
+
+#if !defined(NO_CGI)
+#define SIGKILL 0
+static int kill(pid_t pid, int sig_num) {
+  (void) TerminateProcess(pid, sig_num);
+  (void) CloseHandle(pid);
+  return 0;
+}
+
+static pid_t spawn_process(struct mg_connection *conn, const char *prog,
+                           char *envblk, char *envp[], int fd_stdin,
+                           int fd_stdout, const char *dir) {
+  HANDLE me;
+  char *p, *interp, cmdline[PATH_MAX], buf[PATH_MAX];
+  FILE *fp;
+  STARTUPINFOA si;
+  PROCESS_INFORMATION pi;
+
+  envp = NULL; // Unused
+
+  (void) memset(&si, 0, sizeof(si));
+  (void) memset(&pi, 0, sizeof(pi));
+
+  // TODO(lsm): redirect CGI errors to the error log file
+  si.cb  = sizeof(si);
+  si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
+  si.wShowWindow = SW_HIDE;
+
+  me = GetCurrentProcess();
+  (void) DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdin), me,
+      &si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS);
+  (void) DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdout), me,
+      &si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS);
+
+  // If CGI file is a script, try to read the interpreter line
+  interp = conn->ctx->config[CGI_INTERPRETER];
+  if (interp == NULL) {
+    buf[2] = '\0';
+    mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%c%s", dir, DIRSEP, prog);
+    if ((fp = fopen(cmdline, "r")) != NULL) {
+      (void) fgets(buf, sizeof(buf), fp);
+      if (buf[0] != '#' || buf[1] != '!') {
+        // First line does not start with "#!". Do not set interpreter.
+        buf[2] = '\0';
+      } else {
+        // Trim whitespaces in interpreter name
+        for (p = &buf[strlen(buf) - 1]; p > buf && isspace(*p); p--) {
+          *p = '\0';
+        }
+      }
+      (void) fclose(fp);
+    }
+    interp = buf + 2;
+  }
+
+  (void) mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s%s%c%s",
+                     interp, interp[0] == '\0' ? "" : " ", dir, DIRSEP, prog);
+
+  DEBUG_TRACE(("Running [%s]", cmdline));
+  if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE,
+        CREATE_NEW_PROCESS_GROUP, envblk, dir, &si, &pi) == 0) {
+    cry(conn, "%s: CreateProcess(%s): %d",
+        __func__, cmdline, ERRNO);
+    pi.hProcess = (pid_t) -1;
+  } else {
+    (void) close(fd_stdin);
+    (void) close(fd_stdout);
+  }
+
+  (void) CloseHandle(si.hStdOutput);
+  (void) CloseHandle(si.hStdInput);
+  (void) CloseHandle(pi.hThread);
+
+  return (pid_t) pi.hProcess;
+}
+#endif // !NO_CGI
+
+static int set_non_blocking_mode(SOCKET sock) {
+  unsigned long on = 1;
+  return ioctlsocket(sock, FIONBIO, &on);
+}
+
+#else
+static int mg_stat(const char *path, struct mgstat *stp) {
+  struct stat st;
+  int ok;
+
+  if (stat(path, &st) == 0) {
+    ok = 0;
+    stp->size = st.st_size;
+    stp->mtime = st.st_mtime;
+    stp->is_directory = S_ISDIR(st.st_mode);
+  } else {
+    ok = -1;
+  }
+
+  return ok;
+}
+
+static void set_close_on_exec(int fd) {
+  (void) fcntl(fd, F_SETFD, FD_CLOEXEC);
+}
+
+static int start_thread(struct mg_context *ctx, mg_thread_func_t func,
+                        void *param) {
+  pthread_t thread_id;
+  pthread_attr_t attr;
+  int retval;
+
+  (void) pthread_attr_init(&attr);
+  (void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+  // TODO(lsm): figure out why mongoose dies on Linux if next line is enabled
+  // (void) pthread_attr_setstacksize(&attr, sizeof(struct mg_connection) * 5);
+
+  if ((retval = pthread_create(&thread_id, &attr, func, param)) != 0) {
+    cry(fc(ctx), "%s: %s", __func__, strerror(retval));
+  }
+
+  return retval;
+}
+
+#ifndef NO_CGI
+static pid_t spawn_process(struct mg_connection *conn, const char *prog,
+                           char *envblk, char *envp[], int fd_stdin,
+                           int fd_stdout, const char *dir) {
+  pid_t pid;
+  const char *interp;
+
+  envblk = NULL; // Unused
+
+  if ((pid = fork()) == -1) {
+    // Parent
+    send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO));
+  } else if (pid == 0) {
+    // Child
+    if (chdir(dir) != 0) {
+      cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO));
+    } else if (dup2(fd_stdin, 0) == -1) {
+      cry(conn, "%s: dup2(%d, 0): %s", __func__, fd_stdin, strerror(ERRNO));
+    } else if (dup2(fd_stdout, 1) == -1) {
+      cry(conn, "%s: dup2(%d, 1): %s", __func__, fd_stdout, strerror(ERRNO));
+    } else {
+      (void) dup2(fd_stdout, 2);
+      (void) close(fd_stdin);
+      (void) close(fd_stdout);
+
+      // Execute CGI program. No need to lock: new process
+      interp = conn->ctx->config[CGI_INTERPRETER];
+      if (interp == NULL) {
+        (void) execle(prog, prog, NULL, envp);
+        cry(conn, "%s: execle(%s): %s", __func__, prog, strerror(ERRNO));
+      } else {
+        (void) execle(interp, interp, prog, NULL, envp);
+        cry(conn, "%s: execle(%s %s): %s", __func__, interp, prog,
+            strerror(ERRNO));
+      }
+    }
+    exit(EXIT_FAILURE);
+  } else {
+    // Parent. Close stdio descriptors
+    (void) close(fd_stdin);
+    (void) close(fd_stdout);
+  }
+
+  return pid;
+}
+#endif // !NO_CGI
+
+static int set_non_blocking_mode(SOCKET sock) {
+  int flags;
+
+  flags = fcntl(sock, F_GETFL, 0);
+  (void) fcntl(sock, F_SETFL, flags | O_NONBLOCK);
+
+  return 0;
+}
+#endif // _WIN32
+
+// Write data to the IO channel - opened file descriptor, socket or SSL
+// descriptor. Return number of bytes written.
+static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf,
+                    int64_t len) {
+  int64_t sent;
+  int n, k;
+
+  sent = 0;
+  while (sent < len) {
+
+    // How many bytes we send in this iteration
+    k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent);
+
+    if (ssl != NULL) {
+      n = SSL_write(ssl, buf + sent, k);
+    } else if (fp != NULL) {
+      n = fwrite(buf + sent, 1, (size_t)k, fp);
+      if (ferror(fp))
+        n = -1;
+    } else {
+      n = send(sock, buf + sent, (size_t)k, 0);
+    }
+
+    if (n < 0)
+      break;
+
+    sent += n;
+  }
+
+  return sent;
+}
+
+// Read from IO channel - opened file descriptor, socket, or SSL descriptor.
+// Return number of bytes read.
+static int pull(FILE *fp, SOCKET sock, SSL *ssl, char *buf, int len) {
+  int nread;
+
+  if (ssl != NULL) {
+    nread = SSL_read(ssl, buf, len);
+  } else if (fp != NULL) {
+    // Use read() instead of fread(), because if we're reading from the CGI
+    // pipe, fread() may block until IO buffer is filled up. We cannot afford
+    // to block and must pass all read bytes immediately to the client.
+    nread = read(fileno(fp), buf, (size_t) len);
+    if (ferror(fp))
+      nread = -1;
+  } else {
+    nread = recv(sock, buf, (size_t) len, 0);
+  }
+
+  return nread;
+}
+
+int mg_read(struct mg_connection *conn, void *buf, size_t len) {
+  int n, buffered_len, nread;
+  const char *buffered;
+
+  assert((conn->content_len == -1 && conn->consumed_content == 0) ||
+         conn->consumed_content <= conn->content_len);
+  DEBUG_TRACE(("%p %zu %lld %lld", buf, len,
+               conn->content_len, conn->consumed_content));
+  nread = 0;
+  if (conn->consumed_content < conn->content_len) {
+
+    // Adjust number of bytes to read.
+    int64_t to_read = conn->content_len - conn->consumed_content;
+    if (to_read < (int64_t) len) {
+      len = (int) to_read;
+    }
+
+    // How many bytes of data we have buffered in the request buffer?
+    buffered = conn->buf + conn->request_len + conn->consumed_content;
+    buffered_len = conn->data_len - conn->request_len;
+    assert(buffered_len >= 0);
+
+    // Return buffered data back if we haven't done that yet.
+    if (conn->consumed_content < (int64_t) buffered_len) {
+      buffered_len -= (int) conn->consumed_content;
+      if (len < (size_t) buffered_len) {
+        buffered_len = len;
+      }
+      memcpy(buf, buffered, (size_t)buffered_len);
+      len -= buffered_len;
+      buf = (char *) buf + buffered_len;
+      conn->consumed_content += buffered_len;
+      nread = buffered_len;
+    }
+
+    // We have returned all buffered data. Read new data from the remote socket.
+    while (len > 0) {
+      n = pull(NULL, conn->client.sock, conn->ssl, (char *) buf, (int) len);
+      if (n <= 0) {
+        break;
+      }
+      buf = (char *) buf + n;
+      conn->consumed_content += n;
+      nread += n;
+      len -= n;
+    }
+  }
+  return nread;
+}
+
+int mg_write(struct mg_connection *conn, const void *buf, size_t len) {
+  return (int) push(NULL, conn->client.sock, conn->ssl,
+      (const char *) buf, (int64_t) len);
+}
+
+int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
+  char buf[BUFSIZ];
+  int len;
+  va_list ap;
+
+  va_start(ap, fmt);
+  len = mg_vsnprintf(conn, buf, sizeof(buf), fmt, ap);
+  va_end(ap);
+
+  return mg_write(conn, buf, (size_t)len);
+}
+
+// URL-decode input buffer into destination buffer.
+// 0-terminate the destination buffer. Return the length of decoded data.
+// form-url-encoded data differs from URI encoding in a way that it
+// uses '+' as character for space, see RFC 1866 section 8.2.1
+// http://ftp.ics.uci.edu/pub/ietf/html/rfc1866.txt
+static size_t url_decode(const char *src, size_t src_len, char *dst,
+                         size_t dst_len, int is_form_url_encoded) {
+  size_t i, j;
+  int a, b;
+#define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W')
+
+  for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
+    if (src[i] == '%' &&
+        isxdigit(* (const unsigned char *) (src + i + 1)) &&
+        isxdigit(* (const unsigned char *) (src + i + 2))) {
+      a = tolower(* (const unsigned char *) (src + i + 1));
+      b = tolower(* (const unsigned char *) (src + i + 2));
+      dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));
+      i += 2;
+    } else if (is_form_url_encoded && src[i] == '+') {
+      dst[j] = ' ';
+    } else {
+      dst[j] = src[i];
+    }
+  }
+
+  dst[j] = '\0'; // Null-terminate the destination
+
+  return j;
+}
+
+// Scan given buffer and fetch the value of the given variable.
+// It can be specified in query string, or in the POST data.
+// Return NULL if the variable not found, or allocated 0-terminated value.
+// It is caller's responsibility to free the returned value.
+int mg_get_var(const char *buf, size_t buf_len, const char *name,
+               char *dst, size_t dst_len) {
+  const char *p, *e, *s;
+  size_t name_len, len;
+
+  name_len = strlen(name);
+  e = buf + buf_len;
+  len = -1;
+  dst[0] = '\0';
+
+  // buf is "var1=val1&var2=val2...". Find variable first
+  for (p = buf; p != NULL && p + name_len < e; p++) {
+    if ((p == buf || p[-1] == '&') && p[name_len] == '=' &&
+        !mg_strncasecmp(name, p, name_len)) {
+
+      // Point p to variable value
+      p += name_len + 1;
+
+      // Point s to the end of the value
+      s = (const char *) memchr(p, '&', (size_t)(e - p));
+      if (s == NULL) {
+        s = e;
+      }
+      assert(s >= p);
+
+      // Decode variable into destination buffer
+      if ((size_t) (s - p) < dst_len) {
+        len = url_decode(p, (size_t)(s - p), dst, dst_len, 1);
+      }
+      break;
+    }
+  }
+
+  return len;
+}
+
+int mg_get_cookie(const struct mg_connection *conn, const char *cookie_name,
+                  char *dst, size_t dst_size) {
+  const char *s, *p, *end;
+  int name_len, len = -1;
+
+  dst[0] = '\0';
+  if ((s = mg_get_header(conn, "Cookie")) == NULL) {
+    return 0;
+  }
+
+  name_len = strlen(cookie_name);
+  end = s + strlen(s);
+
+  for (; (s = strstr(s, cookie_name)) != NULL; s += name_len)
+    if (s[name_len] == '=') {
+      s += name_len + 1;
+      if ((p = strchr(s, ' ')) == NULL)
+        p = end;
+      if (p[-1] == ';')
+        p--;
+      if (*s == '"' && p[-1] == '"' && p > s + 1) {
+        s++;
+        p--;
+      }
+      if ((size_t) (p - s) < dst_size) {
+        len = (p - s) + 1;
+        mg_strlcpy(dst, s, (size_t)len);
+      }
+      break;
+    }
+
+  return len;
+}
+
+// Mongoose allows to specify multiple directories to serve,
+// like /var/www,/~bob=/home/bob. That means that root directory depends on URI.
+// This function returns root dir for given URI.
+static int get_document_root(const struct mg_connection *conn,
+                             struct vec *document_root) {
+  const char *root, *uri;
+  int len_of_matched_uri;
+  struct vec uri_vec, path_vec;
+
+  uri = conn->request_info.uri;
+  len_of_matched_uri = 0;
+  root = next_option(conn->ctx->config[DOCUMENT_ROOT], document_root, NULL);
+
+  while ((root = next_option(root, &uri_vec, &path_vec)) != NULL) {
+    if (memcmp(uri, uri_vec.ptr, uri_vec.len) == 0) {
+      *document_root = path_vec;
+      len_of_matched_uri = uri_vec.len;
+      break;
+    }
+  }
+
+  return len_of_matched_uri;
+}
+
+static void convert_uri_to_file_name(struct mg_connection *conn,
+                                     const char *uri, char *buf,
+                                     size_t buf_len) {
+  struct vec vec;
+  int match_len;
+
+  match_len = get_document_root(conn, &vec);
+  mg_snprintf(conn, buf, buf_len, "%.*s%s", vec.len, vec.ptr, uri + match_len);
+
+#if defined(_WIN32) && !defined(__SYMBIAN32__)
+  change_slashes_to_backslashes(buf);
+#endif // _WIN32
+
+  DEBUG_TRACE(("[%s] -> [%s], [%.*s]", uri, buf, (int) vec.len, vec.ptr));
+}
+
+static int sslize(struct mg_connection *conn, int (*func)(SSL *)) {
+  return (conn->ssl = SSL_new(conn->ctx->ssl_ctx)) != NULL &&
+    SSL_set_fd(conn->ssl, conn->client.sock) == 1 &&
+    func(conn->ssl) == 1;
+}
+
+static struct mg_connection *mg_connect(struct mg_connection *conn,
+                                 const char *host, int port, int use_ssl) {
+  struct mg_connection *newconn = NULL;
+  struct sockaddr_in sin;
+  struct hostent *he;
+  int sock;
+
+  if (conn->ctx->ssl_ctx == NULL && use_ssl) {
+    cry(conn, "%s: SSL is not initialized", __func__);
+  } else if ((he = gethostbyname(host)) == NULL) {
+    cry(conn, "%s: gethostbyname(%s): %s", __func__, host, strerror(ERRNO));
+  } else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
+    cry(conn, "%s: socket: %s", __func__, strerror(ERRNO));
+  } else {
+    sin.sin_family = AF_INET;
+    sin.sin_port = htons((uint16_t) port);
+    sin.sin_addr = * (struct in_addr *) he->h_addr_list[0];
+    if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) {
+      cry(conn, "%s: connect(%s:%d): %s", __func__, host, port,
+          strerror(ERRNO));
+      closesocket(sock);
+    } else if ((newconn = (struct mg_connection *)
+                calloc(1, sizeof(*newconn))) == NULL) {
+      cry(conn, "%s: calloc: %s", __func__, strerror(ERRNO));
+      closesocket(sock);
+    } else {
+      newconn->client.sock = sock;
+      newconn->client.rsa.u.sin = sin;
+      if (use_ssl) {
+        sslize(newconn, SSL_connect);
+      }
+    }
+  }
+
+  return newconn;
+}
+
+// Check whether full request is buffered. Return:
+//   -1  if request is malformed
+//    0  if request is not yet fully buffered
+//   >0  actual request length, including last \r\n\r\n
+static int get_request_len(const char *buf, int buflen) {
+  const char *s, *e;
+  int len = 0;
+
+  DEBUG_TRACE(("buf: %p, len: %d", buf, buflen));
+  for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++)
+    // Control characters are not allowed but >=128 is.
+    if (!isprint(* (const unsigned char *) s) && *s != '\r' &&
+        *s != '\n' && * (const unsigned char *) s < 128) {
+      len = -1;
+    } else if (s[0] == '\n' && s[1] == '\n') {
+      len = (int) (s - buf) + 2;
+    } else if (s[0] == '\n' && &s[1] < e &&
+        s[1] == '\r' && s[2] == '\n') {
+      len = (int) (s - buf) + 3;
+    }
+
+  return len;
+}
+
+// Convert month to the month number. Return -1 on error, or month number
+static int get_month_index(const char *s) {
+  size_t i;
+
+  for (i = 0; i < ARRAY_SIZE(month_names); i++)
+    if (!strcmp(s, month_names[i]))
+      return (int) i;
+
+  return -1;
+}
+
+// Parse UTC date-time string, and return the corresponding time_t value.
+static time_t parse_date_string(const char *datetime) {
+  static const unsigned short days_before_month[] = {
+    0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
+  };
+  char month_str[32];
+  int second, minute, hour, day, month, year, leap_days, days;
+  time_t result = (time_t) 0;
+
+  if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d",
+               &day, month_str, &year, &hour, &minute, &second) == 6) ||
+       (sscanf(datetime, "%d %3s %d %d:%d:%d",
+               &day, month_str, &year, &hour, &minute, &second) == 6) ||
+       (sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d",
+               &day, month_str, &year, &hour, &minute, &second) == 6) ||
+       (sscanf(datetime, "%d-%3s-%d %d:%d:%d",
+               &day, month_str, &year, &hour, &minute, &second) == 6)) &&
+      year > 1970 &&
+      (month = get_month_index(month_str)) != -1) {
+    year -= 1970;
+    leap_days = year / 4 - year / 100 + year / 400;
+    days = year * 365 + days_before_month[month] + (day - 1) + leap_days;
+    result = days * 24 * 3600 + hour * 3600 + minute * 60 + second;
+  }
+
+  return result;
+}
+
+// Protect against directory disclosure attack by removing '..',
+// excessive '/' and '\' characters
+static void remove_double_dots_and_double_slashes(char *s) {
+  char *p = s;
+
+  while (*s != '\0') {
+    *p++ = *s++;
+    if (s[-1] == '/' || s[-1] == '\\') {
+      // Skip all following slashes and backslashes
+      while (*s == '/' || *s == '\\') {
+        s++;
+      }
+
+      // Skip all double-dots
+      while (*s == '.' && s[1] == '.') {
+        s += 2;
+      }
+    }
+  }
+  *p = '\0';
+}
+
+static const struct {
+  const char *extension;
+  size_t ext_len;
+  const char *mime_type;
+  size_t mime_type_len;
+} builtin_mime_types[] = {
+  {".html", 5, "text/html",   9},
+  {".htm", 4, "text/html",   9},
+  {".shtm", 5, "text/html",   9},
+  {".shtml", 6, "text/html",   9},
+  {".css", 4, "text/css",   8},
+  {".js",  3, "application/x-javascript", 24},
+  {".ico", 4, "image/x-icon",   12},
+  {".gif", 4, "image/gif",   9},
+  {".jpg", 4, "image/jpeg",   10},
+  {".jpeg", 5, "image/jpeg",   10},
+  {".png", 4, "image/png",   9},
+  {".svg", 4, "image/svg+xml",  13},
+  {".torrent", 8, "application/x-bittorrent", 24},
+  {".wav", 4, "audio/x-wav",   11},
+  {".mp3", 4, "audio/x-mp3",   11},
+  {".mid", 4, "audio/mid",   9},
+  {".m3u", 4, "audio/x-mpegurl",  15},
+  {".ram", 4, "audio/x-pn-realaudio",  20},
+  {".xml", 4, "text/xml",   8},
+  {".xslt", 5, "application/xml",  15},
+  {".ra",  3, "audio/x-pn-realaudio",  20},
+  {".doc", 4, "application/msword",  19},
+  {".exe", 4, "application/octet-stream", 24},
+  {".zip", 4, "application/x-zip-compressed", 28},
+  {".xls", 4, "application/excel",  17},
+  {".tgz", 4, "application/x-tar-gz",  20},
+  {".tar", 4, "application/x-tar",  17},
+  {".gz",  3, "application/x-gunzip",  20},
+  {".arj", 4, "application/x-arj-compressed", 28},
+  {".rar", 4, "application/x-arj-compressed", 28},
+  {".rtf", 4, "application/rtf",  15},
+  {".pdf", 4, "application/pdf",  15},
+  {".swf", 4, "application/x-shockwave-flash",29},
+  {".mpg", 4, "video/mpeg",   10},
+  {".mpeg", 5, "video/mpeg",   10},
+  {".mp4", 4, "video/mp4", 9},
+  {".m4v", 4, "video/x-m4v", 11},
+  {".asf", 4, "video/x-ms-asf",  14},
+  {".avi", 4, "video/x-msvideo",  15},
+  {".bmp", 4, "image/bmp",   9},
+  {NULL,  0, NULL,    0}
+};
+
+// Look at the "path" extension and figure what mime type it has.
+// Store mime type in the vector.
+static void get_mime_type(struct mg_context *ctx, const char *path,
+                          struct vec *vec) {
+  struct vec ext_vec, mime_vec;
+  const char *list, *ext;
+  size_t i, path_len;
+
+  path_len = strlen(path);
+
+  // Scan user-defined mime types first, in case user wants to
+  // override default mime types.
+  list = ctx->config[EXTRA_MIME_TYPES];
+  while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) {
+    // ext now points to the path suffix
+    ext = path + path_len - ext_vec.len;
+    if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) {
+      *vec = mime_vec;
+      return;
+    }
+  }
+
+  // Now scan built-in mime types
+  for (i = 0; builtin_mime_types[i].extension != NULL; i++) {
+    ext = path + (path_len - builtin_mime_types[i].ext_len);
+    if (path_len > builtin_mime_types[i].ext_len &&
+        mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) {
+      vec->ptr = builtin_mime_types[i].mime_type;
+      vec->len = builtin_mime_types[i].mime_type_len;
+      return;
+    }
+  }
+
+  // Nothing found. Fall back to "text/plain"
+  vec->ptr = "text/plain";
+  vec->len = 10;
+}
+
+#ifndef HAVE_MD5
+typedef struct MD5Context {
+  uint32_t buf[4];
+  uint32_t bits[2];
+  unsigned char in[64];
+} MD5_CTX;
+
+#if defined(__BYTE_ORDER) && (__BYTE_ORDER == 1234)
+#define byteReverse(buf, len) // Do nothing
+#else
+static void byteReverse(unsigned char *buf, unsigned longs) {
+  uint32_t t;
+  do {
+    t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
+      ((unsigned) buf[1] << 8 | buf[0]);
+    *(uint32_t *) buf = t;
+    buf += 4;
+  } while (--longs);
+}
+#endif
+
+#define F1(x, y, z) (z ^ (x & (y ^ z)))
+#define F2(x, y, z) F1(z, x, y)
+#define F3(x, y, z) (x ^ y ^ z)
+#define F4(x, y, z) (y ^ (x | ~z))
+
+#define MD5STEP(f, w, x, y, z, data, s) \
+  ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
+
+// Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
+// initialization constants.
+static void MD5Init(MD5_CTX *ctx) {
+  ctx->buf[0] = 0x67452301;
+  ctx->buf[1] = 0xefcdab89;
+  ctx->buf[2] = 0x98badcfe;
+  ctx->buf[3] = 0x10325476;
+
+  ctx->bits[0] = 0;
+  ctx->bits[1] = 0;
+}
+
+static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) {
+  register uint32_t a, b, c, d;
+
+  a = buf[0];
+  b = buf[1];
+  c = buf[2];
+  d = buf[3];
+
+  MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
+  MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
+  MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
+  MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
+  MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
+  MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
+  MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
+  MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
+  MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
+  MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
+  MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
+  MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
+  MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
+  MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
+  MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
+  MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
+
+  MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
+  MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
+  MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
+  MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
+  MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
+  MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
+  MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
+  MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
+  MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
+  MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
+  MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
+  MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
+  MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
+  MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
+  MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
+  MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
+
+  MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
+  MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
+  MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
+  MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
+  MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
+  MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
+  MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
+  MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
+  MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
+  MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
+  MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
+  MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
+  MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
+  MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
+  MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
+  MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
+
+  MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
+  MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
+  MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
+  MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
+  MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
+  MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
+  MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
+  MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
+  MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
+  MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
+  MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
+  MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
+  MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
+  MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
+  MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
+  MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
+
+  buf[0] += a;
+  buf[1] += b;
+  buf[2] += c;
+  buf[3] += d;
+}
+
+static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) {
+  uint32_t t;
+
+  t = ctx->bits[0];
+  if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
+    ctx->bits[1]++;
+  ctx->bits[1] += len >> 29;
+
+  t = (t >> 3) & 0x3f;
+
+  if (t) {
+    unsigned char *p = (unsigned char *) ctx->in + t;
+
+    t = 64 - t;
+    if (len < t) {
+      memcpy(p, buf, len);
+      return;
+    }
+    memcpy(p, buf, t);
+    byteReverse(ctx->in, 16);
+    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+    buf += t;
+    len -= t;
+  }
+
+  while (len >= 64) {
+    memcpy(ctx->in, buf, 64);
+    byteReverse(ctx->in, 16);
+    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+    buf += 64;
+    len -= 64;
+  }
+
+  memcpy(ctx->in, buf, len);
+}
+
+static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) {
+  unsigned count;
+  unsigned char *p;
+
+  count = (ctx->bits[0] >> 3) & 0x3F;
+
+  p = ctx->in + count;
+  *p++ = 0x80;
+  count = 64 - 1 - count;
+  if (count < 8) {
+    memset(p, 0, count);
+    byteReverse(ctx->in, 16);
+    MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+    memset(ctx->in, 0, 56);
+  } else {
+    memset(p, 0, count - 8);
+  }
+  byteReverse(ctx->in, 14);
+
+  ((uint32_t *) ctx->in)[14] = ctx->bits[0];
+  ((uint32_t *) ctx->in)[15] = ctx->bits[1];
+
+  MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+  byteReverse((unsigned char *) ctx->buf, 4);
+  memcpy(digest, ctx->buf, 16);
+  memset((char *) ctx, 0, sizeof(*ctx));
+}
+#endif // !HAVE_MD5
+
+// Stringify binary data. Output buffer must be twice as big as input,
+// because each byte takes 2 bytes in string representation
+static void bin2str(char *to, const unsigned char *p, size_t len) {
+  static const char *hex = "0123456789abcdef";
+
+  for (; len--; p++) {
+    *to++ = hex[p[0] >> 4];
+    *to++ = hex[p[0] & 0x0f];
+  }
+  *to = '\0';
+}
+
+// Return stringified MD5 hash for list of vectors. Buffer must be 33 bytes.
+void mg_md5(char *buf, ...) {
+  unsigned char hash[16];
+  const char *p;
+  va_list ap;
+  MD5_CTX ctx;
+
+  MD5Init(&ctx);
+
+  va_start(ap, buf);
+  while ((p = va_arg(ap, const char *)) != NULL) {
+    MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p));
+  }
+  va_end(ap);
+
+  MD5Final(hash, &ctx);
+  bin2str(buf, hash, sizeof(hash));
+}
+
+// Check the user's password, return 1 if OK
+static int check_password(const char *method, const char *ha1, const char *uri,
+                          const char *nonce, const char *nc, const char *cnonce,
+                          const char *qop, const char *response) {
+  char ha2[32 + 1], expected_response[32 + 1];
+
+  // Some of the parameters may be NULL
+  if (method == NULL || nonce == NULL || nc == NULL || cnonce == NULL ||
+      qop == NULL || response == NULL) {
+    return 0;
+  }
+
+  // NOTE(lsm): due to a bug in MSIE, we do not compare the URI
+  // TODO(lsm): check for authentication timeout
+  if (// strcmp(dig->uri, c->ouri) != 0 ||
+      strlen(response) != 32
+      // || now - strtoul(dig->nonce, NULL, 10) > 3600
+      ) {
+    return 0;
+  }
+
+  mg_md5(ha2, method, ":", uri, NULL);
+  mg_md5(expected_response, ha1, ":", nonce, ":", nc,
+      ":", cnonce, ":", qop, ":", ha2, NULL);
+
+  return mg_strcasecmp(response, expected_response) == 0;
+}
+
+// Use the global passwords file, if specified by auth_gpass option,
+// or search for .htpasswd in the requested directory.
+static FILE *open_auth_file(struct mg_connection *conn, const char *path) {
+  struct mg_context *ctx = conn->ctx;
+  char name[PATH_MAX];
+  const char *p, *e;
+  struct mgstat st;
+  FILE *fp;
+
+  if (ctx->config[GLOBAL_PASSWORDS_FILE] != NULL) {
+    // Use global passwords file
+    fp =  mg_fopen(ctx->config[GLOBAL_PASSWORDS_FILE], "r");
+    if (fp == NULL)
+      cry(fc(ctx), "fopen(%s): %s",
+          ctx->config[GLOBAL_PASSWORDS_FILE], strerror(ERRNO));
+  } else if (!mg_stat(path, &st) && st.is_directory) {
+    (void) mg_snprintf(conn, name, sizeof(name), "%s%c%s",
+        path, DIRSEP, PASSWORDS_FILE_NAME);
+    fp = mg_fopen(name, "r");
+  } else {
+     // Try to find .htpasswd in requested directory.
+    for (p = path, e = p + strlen(p) - 1; e > p; e--)
+      if (IS_DIRSEP_CHAR(*e))
+        break;
+    (void) mg_snprintf(conn, name, sizeof(name), "%.*s%c%s",
+        (int) (e - p), p, DIRSEP, PASSWORDS_FILE_NAME);
+    fp = mg_fopen(name, "r");
+  }
+
+  return fp;
+}
+
+// Parsed Authorization header
+struct ah {
+  char *user, *uri, *cnonce, *response, *qop, *nc, *nonce;
+};
+
+static int parse_auth_header(struct mg_connection *conn, char *buf,
+                             size_t buf_size, struct ah *ah) {
+  char *name, *value, *s;
+  const char *auth_header;
+
+  if ((auth_header = mg_get_header(conn, "Authorization")) == NULL ||
+      mg_strncasecmp(auth_header, "Digest ", 7) != 0) {
+    return 0;
+  }
+
+  // Make modifiable copy of the auth header
+  (void) mg_strlcpy(buf, auth_header + 7, buf_size);
+
+  s = buf;
+  (void) memset(ah, 0, sizeof(*ah));
+
+  // Parse authorization header
+  for (;;) {
+    // Gobble initial spaces
+    while (isspace(* (unsigned char *) s)) {
+      s++;
+    }
+    name = skip_quoted(&s, "=", " ", 0);
+    // Value is either quote-delimited, or ends at first comma or space.
+    if (s[0] == '\"') {
+      s++;
+      value = skip_quoted(&s, "\"", " ", '\\');
+      if (s[0] == ',') {
+        s++;
+      }
+    } else {
+      value = skip_quoted(&s, ", ", " ", 0);  // IE uses commas, FF uses spaces
+    }
+    if (*name == '\0') {
+      break;
+    }
+
+    if (!strcmp(name, "username")) {
+      ah->user = value;
+    } else if (!strcmp(name, "cnonce")) {
+      ah->cnonce = value;
+    } else if (!strcmp(name, "response")) {
+      ah->response = value;
+    } else if (!strcmp(name, "uri")) {
+      ah->uri = value;
+    } else if (!strcmp(name, "qop")) {
+      ah->qop = value;
+    } else if (!strcmp(name, "nc")) {
+      ah->nc = value;
+    } else if (!strcmp(name, "nonce")) {
+      ah->nonce = value;
+    }
+  }
+
+  // CGI needs it as REMOTE_USER
+  if (ah->user != NULL) {
+    conn->request_info.remote_user = mg_strdup(ah->user);
+  } else {
+    return 0;
+  }
+
+  return 1;
+}
+
+// Authorize against the opened passwords file. Return 1 if authorized.
+static int authorize(struct mg_connection *conn, FILE *fp) {
+  struct ah ah;
+  char line[256], f_user[256], ha1[256], f_domain[256], buf[BUFSIZ];
+
+  if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) {
+    return 0;
+  }
+
+  // Loop over passwords file
+  while (fgets(line, sizeof(line), fp) != NULL) {
+    if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) {
+      continue;
+    }
+
+    if (!strcmp(ah.user, f_user) &&
+        !strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain))
+      return check_password(
+            conn->request_info.request_method,
+            ha1, ah.uri, ah.nonce, ah.nc, ah.cnonce, ah.qop,
+            ah.response);
+  }
+
+  return 0;
+}
+
+// Return 1 if request is authorised, 0 otherwise.
+static int check_authorization(struct mg_connection *conn, const char *path) {
+  FILE *fp;
+  char fname[PATH_MAX];
+  struct vec uri_vec, filename_vec;
+  const char *list;
+  int authorized;
+
+  fp = NULL;
+  authorized = 1;
+
+  list = conn->ctx->config[PROTECT_URI];
+  while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) {
+    if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) {
+      (void) mg_snprintf(conn, fname, sizeof(fname), "%.*s",
+          filename_vec.len, filename_vec.ptr);
+      if ((fp = mg_fopen(fname, "r")) == NULL) {
+        cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno));
+      }
+      break;
+    }
+  }
+
+  if (fp == NULL) {
+    fp = open_auth_file(conn, path);
+  }
+
+  if (fp != NULL) {
+    authorized = authorize(conn, fp);
+    (void) fclose(fp);
+  }
+
+  return authorized;
+}
+
+static void send_authorization_request(struct mg_connection *conn) {
+  conn->request_info.status_code = 401;
+  (void) mg_printf(conn,
+      "HTTP/1.1 401 Unauthorized\r\n"
+      "Content-Length: 0\r\n"
+      "WWW-Authenticate: Digest qop=\"auth\", "
+      "realm=\"%s\", nonce=\"%lu\"\r\n\r\n",
+      conn->ctx->config[AUTHENTICATION_DOMAIN],
+      (unsigned long) time(NULL));
+}
+
+static int is_authorized_for_put(struct mg_connection *conn) {
+  FILE *fp;
+  int ret = 0;
+
+  fp = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL ? NULL :
+    mg_fopen(conn->ctx->config[PUT_DELETE_PASSWORDS_FILE], "r");
+
+  if (fp != NULL) {
+    ret = authorize(conn, fp);
+    (void) fclose(fp);
+  }
+
+  return ret;
+}
+
+int mg_modify_passwords_file(const char *fname, const char *domain,
+                             const char *user, const char *pass) {
+  int found;
+  char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX];
+  FILE *fp, *fp2;
+
+  found = 0;
+  fp = fp2 = NULL;
+
+  // Regard empty password as no password - remove user record.
+  if (pass != NULL && pass[0] == '\0') {
+    pass = NULL;
+  }
+
+  (void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname);
+
+  // Create the file if does not exist
+  if ((fp = mg_fopen(fname, "a+")) != NULL) {
+    (void) fclose(fp);
+  }
+
+  // Open the given file and temporary file
+  if ((fp = mg_fopen(fname, "r")) == NULL) {
+    return 0;
+  } else if ((fp2 = mg_fopen(tmp, "w+")) == NULL) {
+    fclose(fp);
+    return 0;
+  }
+
+  // Copy the stuff to temporary file
+  while (fgets(line, sizeof(line), fp) != NULL) {
+    if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) {
+      continue;
+    }
+
+    if (!strcmp(u, user) && !strcmp(d, domain)) {
+      found++;
+      if (pass != NULL) {
+        mg_md5(ha1, user, ":", domain, ":", pass, NULL);
+        fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
+      }
+    } else {
+      (void) fprintf(fp2, "%s", line);
+    }
+  }
+
+  // If new user, just add it
+  if (!found && pass != NULL) {
+    mg_md5(ha1, user, ":", domain, ":", pass, NULL);
+    (void) fprintf(fp2, "%s:%s:%s\n", user, domain, ha1);
+  }
+
+  // Close files
+  (void) fclose(fp);
+  (void) fclose(fp2);
+
+  // Put the temp file in place of real file
+  (void) mg_remove(fname);
+  (void) mg_rename(tmp, fname);
+
+  return 1;
+}
+
+struct de {
+  struct mg_connection *conn;
+  char *file_name;
+  struct mgstat st;
+};
+
+static void url_encode(const char *src, char *dst, size_t dst_len) {
+  static const char *dont_escape = "._-$,;~()";
+  static const char *hex = "0123456789abcdef";
+  const char *end = dst + dst_len - 1;
+
+  for (; *src != '\0' && dst < end; src++, dst++) {
+    if (isalnum(*(const unsigned char *) src) ||
+        strchr(dont_escape, * (const unsigned char *) src) != NULL) {
+      *dst = *src;
+    } else if (dst + 2 < end) {
+      dst[0] = '%';
+      dst[1] = hex[(* (const unsigned char *) src) >> 4];
+      dst[2] = hex[(* (const unsigned char *) src) & 0xf];
+      dst += 2;
+    }
+  }
+
+  *dst = '\0';
+}
+
+static void print_dir_entry(struct de *de) {
+  char size[64], mod[64], href[PATH_MAX];
+
+  if (de->st.is_directory) {
+    (void) mg_snprintf(de->conn, size, sizeof(size), "%s", "[DIRECTORY]");
+  } else {
+     // We use (signed) cast below because MSVC 6 compiler cannot
+     // convert unsigned __int64 to double. Sigh.
+    if (de->st.size < 1024) {
+      (void) mg_snprintf(de->conn, size, sizeof(size),
+          "%lu", (unsigned long) de->st.size);
+    } else if (de->st.size < 1024 * 1024) {
+      (void) mg_snprintf(de->conn, size, sizeof(size),
+          "%.1fk", (double) de->st.size / 1024.0);
+    } else if (de->st.size < 1024 * 1024 * 1024) {
+      (void) mg_snprintf(de->conn, size, sizeof(size),
+          "%.1fM", (double) de->st.size / 1048576);
+    } else {
+      (void) mg_snprintf(de->conn, size, sizeof(size),
+          "%.1fG", (double) de->st.size / 1073741824);
+    }
+  }
+  (void) strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M", localtime(&de->st.mtime));
+  url_encode(de->file_name, href, sizeof(href));
+  de->conn->num_bytes_sent += mg_printf(de->conn,
+      "<tr><td><a href=\"%s%s%s\">%s%s</a></td>"
+      "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
+      de->conn->request_info.uri, href, de->st.is_directory ? "/" : "",
+      de->file_name, de->st.is_directory ? "/" : "", mod, size);
+}
+
+// This function is called from send_directory() and used for
+// sorting directory entries by size, or name, or modification time.
+// On windows, __cdecl specification is needed in case if project is built
+// with __stdcall convention. qsort always requires __cdels callback.
+static int WINCDECL compare_dir_entries(const void *p1, const void *p2) {
+  const struct de *a = (const struct de *) p1, *b = (const struct de *) p2;
+  const char *query_string = a->conn->request_info.query_string;
+  int cmp_result = 0;
+
+  if (query_string == NULL) {
+    query_string = "na";
+  }
+
+  if (a->st.is_directory && !b->st.is_directory) {
+    return -1;  // Always put directories on top
+  } else if (!a->st.is_directory && b->st.is_directory) {
+    return 1;   // Always put directories on top
+  } else if (*query_string == 'n') {
+    cmp_result = strcmp(a->file_name, b->file_name);
+  } else if (*query_string == 's') {
+    cmp_result = a->st.size == b->st.size ? 0 :
+      a->st.size > b->st.size ? 1 : -1;
+  } else if (*query_string == 'd') {
+    cmp_result = a->st.mtime == b->st.mtime ? 0 :
+      a->st.mtime > b->st.mtime ? 1 : -1;
+  }
+
+  return query_string[1] == 'd' ? -cmp_result : cmp_result;
+}
+
+static int scan_directory(struct mg_connection *conn, const char *dir,
+                          void *data, void (*cb)(struct de *, void *)) {
+  char path[PATH_MAX];
+  struct dirent *dp;
+  DIR *dirp;
+  struct de de;
+
+  if ((dirp = opendir(dir)) == NULL) {
+    return 0;
+  } else {
+    de.conn = conn;
+
+    while ((dp = readdir(dirp)) != NULL) {
+      // Do not show current dir and passwords file
+      if (!strcmp(dp->d_name, ".") ||
+          !strcmp(dp->d_name, "..") ||
+          !strcmp(dp->d_name, PASSWORDS_FILE_NAME))
+        continue;
+
+      mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, DIRSEP, dp->d_name);
+
+      // If we don't memset stat structure to zero, mtime will have
+      // garbage and strftime() will segfault later on in
+      // print_dir_entry(). memset is required only if mg_stat()
+      // fails. For more details, see
+      // http://code.google.com/p/mongoose/issues/detail?id=79
+      if (mg_stat(path, &de.st) != 0) {
+        memset(&de.st, 0, sizeof(de.st));
+      }
+      de.file_name = dp->d_name;
+
+      cb(&de, data);
+    }
+    (void) closedir(dirp);
+  }
+  return 1;
+}
+
+struct dir_scan_data {
+  struct de *entries;
+  int num_entries;
+  int arr_size;
+};
+
+static void dir_scan_callback(struct de *de, void *data) {
+  struct dir_scan_data *dsd = (struct dir_scan_data *) data;
+
+  if (dsd->entries == NULL || dsd->num_entries >= dsd->arr_size) {
+    dsd->arr_size *= 2;
+    dsd->entries = (struct de *) realloc(dsd->entries, dsd->arr_size *
+                                         sizeof(dsd->entries[0]));
+  }
+  if (dsd->entries == NULL) {
+    // TODO(lsm): propagate an error to the caller
+    dsd->num_entries = 0;
+  } else {
+    dsd->entries[dsd->num_entries].file_name = mg_strdup(de->file_name);
+    dsd->entries[dsd->num_entries].st = de->st;
+    dsd->entries[dsd->num_entries].conn = de->conn;
+    dsd->num_entries++;
+  }
+}
+
+static void handle_directory_request(struct mg_connection *conn,
+                                     const char *dir) {
+  int i, sort_direction;
+  struct dir_scan_data data = { NULL, 0, 128 };
+
+  if (!scan_directory(conn, dir, &data, dir_scan_callback)) {
+    send_http_error(conn, 500, "Cannot open directory",
+                    "Error: opendir(%s): %s", dir, strerror(ERRNO));
+    return;
+  }
+
+  sort_direction = conn->request_info.query_string != NULL &&
+    conn->request_info.query_string[1] == 'd' ? 'a' : 'd';
+
+  mg_printf(conn, "%s",
+            "HTTP/1.1 200 OK\r\n"
+            "Connection: close\r\n"
+            "Content-Type: text/html; charset=utf-8\r\n\r\n");
+
+  conn->num_bytes_sent += mg_printf(conn,
+      "<html><head><title>Index of %s</title>"
+      "<style>th {text-align: left;}</style></head>"
+      "<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">"
+      "<tr><th><a href=\"?n%c\">Name</a></th>"
+      "<th><a href=\"?d%c\">Modified</a></th>"
+      "<th><a href=\"?s%c\">Size</a></th></tr>"
+      "<tr><td colspan=\"3\"><hr></td></tr>",
+      conn->request_info.uri, conn->request_info.uri,
+      sort_direction, sort_direction, sort_direction);
+
+  // Print first entry - link to a parent directory
+  conn->num_bytes_sent += mg_printf(conn,
+      "<tr><td><a href=\"%s%s\">%s</a></td>"
+      "<td>&nbsp;%s</td><td>&nbsp;&nbsp;%s</td></tr>\n",
+      conn->request_info.uri, "..", "Parent directory", "-", "-");
+
+  // Sort and print directory entries
+  qsort(data.entries, (size_t) data.num_entries, sizeof(data.entries[0]),
+        compare_dir_entries);
+  for (i = 0; i < data.num_entries; i++) {
+    print_dir_entry(&data.entries[i]);
+    free(data.entries[i].file_name);
+  }
+  free(data.entries);
+
+  conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>");
+  conn->request_info.status_code = 200;
+}
+
+// Send len bytes from the opened file to the client.
+static void send_file_data(struct mg_connection *conn, FILE *fp, int64_t len) {
+  char buf[BUFSIZ];
+  int to_read, num_read, num_written;
+
+  while (len > 0) {
+    // Calculate how much to read from the file in the buffer
+    to_read = sizeof(buf);
+    if ((int64_t) to_read > len)
+      to_read = (int) len;
+
+    // Read from file, exit the loop on error
+    if ((num_read = fread(buf, 1, (size_t)to_read, fp)) == 0)
+      break;
+
+    // Send read bytes to the client, exit the loop on error
+    if ((num_written = mg_write(conn, buf, (size_t)num_read)) != num_read)
+      break;
+
+    // Both read and were successful, adjust counters
+    conn->num_bytes_sent += num_written;
+    len -= num_written;
+  }
+}
+
+static int parse_range_header(const char *header, int64_t *a, int64_t *b) {
+  return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b);
+}
+
+static void gmt_time_string(char *buf, size_t buf_len, time_t *t) {
+  strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t));
+}
+
+static void handle_file_request(struct mg_connection *conn, const char *path,
+                                struct mgstat *stp) {
+  char date[64], lm[64], etag[64], range[64];
+  const char *msg = "OK", *hdr;
+  time_t curtime = time(NULL);
+  int64_t cl, r1, r2;
+  struct vec mime_vec;
+  FILE *fp;
+  int n;
+
+  get_mime_type(conn->ctx, path, &mime_vec);
+  cl = stp->size;
+  conn->request_info.status_code = 200;
+  range[0] = '\0';
+
+  if ((fp = mg_fopen(path, "rb")) == NULL) {
+    send_http_error(conn, 500, http_500_error,
+        "fopen(%s): %s", path, strerror(ERRNO));
+    return;
+  }
+  set_close_on_exec(fileno(fp));
+
+  // If Range: header specified, act accordingly
+  r1 = r2 = 0;
+  hdr = mg_get_header(conn, "Range");
+  if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0) {
+    conn->request_info.status_code = 206;
+    (void) fseeko(fp, (off_t) r1, SEEK_SET);
+    cl = n == 2 ? r2 - r1 + 1: cl - r1;
+    (void) mg_snprintf(conn, range, sizeof(range),
+        "Content-Range: bytes "
+        "%" INT64_FMT "-%"
+        INT64_FMT "/%" INT64_FMT "\r\n",
+        r1, r1 + cl - 1, stp->size);
+    msg = "Partial Content";
+  }
+
+  // Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to
+  // http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3
+  gmt_time_string(date, sizeof(date), &curtime);
+  gmt_time_string(lm, sizeof(lm), &stp->mtime);
+  (void) mg_snprintf(conn, etag, sizeof(etag), "%lx.%lx",
+      (unsigned long) stp->mtime, (unsigned long) stp->size);
+
+  (void) mg_printf(conn,
+      "HTTP/1.1 %d %s\r\n"
+      "Date: %s\r\n"
+      "Last-Modified: %s\r\n"
+      "Etag: \"%s\"\r\n"
+      "Content-Type: %.*s\r\n"
+      "Content-Length: %" INT64_FMT "\r\n"
+      "Connection: %s\r\n"
+      "Accept-Ranges: bytes\r\n"
+      "%s\r\n",
+      conn->request_info.status_code, msg, date, lm, etag,
+      mime_vec.len, mime_vec.ptr, cl, suggest_connection_header(conn), range);
+
+  if (strcmp(conn->request_info.request_method, "HEAD") != 0) {
+    send_file_data(conn, fp, cl);
+  }
+  (void) fclose(fp);
+}
+
+void mg_send_file(struct mg_connection *conn, const char *path) {
+  struct mgstat st;
+  if (mg_stat(path, &st) == 0) {
+    handle_file_request(conn, path, &st);
+  } else {
+    send_http_error(conn, 404, "Not Found", "%s", "File not found");
+  }
+}
+
+
+// Parse HTTP headers from the given buffer, advance buffer to the point
+// where parsing stopped.
+static void parse_http_headers(char **buf, struct mg_request_info *ri) {
+  int i;
+
+  for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) {
+    ri->http_headers[i].name = skip_quoted(buf, ":", " ", 0);
+    ri->http_headers[i].value = skip(buf, "\r\n");
+    if (ri->http_headers[i].name[0] == '\0')
+      break;
+    ri->num_headers = i + 1;
+  }
+}
+
+static int is_valid_http_method(const char *method) {
+  return !strcmp(method, "GET") || !strcmp(method, "POST") ||
+    !strcmp(method, "HEAD") || !strcmp(method, "CONNECT") ||
+    !strcmp(method, "PUT") || !strcmp(method, "DELETE") ||
+    !strcmp(method, "OPTIONS") || !strcmp(method, "PROPFIND");
+}
+
+// Parse HTTP request, fill in mg_request_info structure.
+static int parse_http_request(char *buf, struct mg_request_info *ri) {
+  int status = 0;
+
+  // RFC says that all initial whitespaces should be ingored
+  while (*buf != '\0' && isspace(* (unsigned char *) buf)) {
+    buf++;
+  }
+
+  ri->request_method = skip(&buf, " ");
+  ri->uri = skip(&buf, " ");
+  ri->http_version = skip(&buf, "\r\n");
+
+  if (is_valid_http_method(ri->request_method) &&
+      strncmp(ri->http_version, "HTTP/", 5) == 0) {
+    ri->http_version += 5;   // Skip "HTTP/"
+    parse_http_headers(&buf, ri);
+    status = 1;
+  }
+
+  return status;
+}
+
+// Keep reading the input (either opened file descriptor fd, or socket sock,
+// or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the
+// buffer (which marks the end of HTTP request). Buffer buf may already
+// have some data. The length of the data is stored in nread.
+// Upon every read operation, increase nread by the number of bytes read.
+static int read_request(FILE *fp, SOCKET sock, SSL *ssl, char *buf, int bufsiz,
+                        int *nread) {
+  int n, request_len;
+
+  request_len = 0;
+  while (*nread < bufsiz && request_len == 0) {
+    n = pull(fp, sock, ssl, buf + *nread, bufsiz - *nread);
+    if (n <= 0) {
+      break;
+    } else {
+      *nread += n;
+      request_len = get_request_len(buf, *nread);
+    }
+  }
+
+  return request_len;
+}
+
+// For given directory path, substitute it to valid index file.
+// Return 0 if index file has been found, -1 if not found.
+// If the file is found, it's stats is returned in stp.
+static int substitute_index_file(struct mg_connection *conn, char *path,
+                                 size_t path_len, struct mgstat *stp) {
+  const char *list = conn->ctx->config[INDEX_FILES];
+  struct mgstat st;
+  struct vec filename_vec;
+  size_t n = strlen(path);
+  int found = 0;
+
+  // The 'path' given to us points to the directory. Remove all trailing
+  // directory separator characters from the end of the path, and
+  // then append single directory separator character.
+  while (n > 0 && IS_DIRSEP_CHAR(path[n - 1])) {
+    n--;
+  }
+  path[n] = DIRSEP;
+
+  // Traverse index files list. For each entry, append it to the given
+  // path and see if the file exists. If it exists, break the loop
+  while ((list = next_option(list, &filename_vec, NULL)) != NULL) {
+
+    // Ignore too long entries that may overflow path buffer
+    if (filename_vec.len > path_len - n)
+      continue;
+
+    // Prepare full path to the index file
+    (void) mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1);
+
+    // Does it exist?
+    if (mg_stat(path, &st) == 0) {
+      // Yes it does, break the loop
+      *stp = st;
+      found = 1;
+      break;
+    }
+  }
+
+  // If no index file exists, restore directory path
+  if (!found) {
+    path[n] = '\0';
+  }
+
+  return found;
+}
+
+// Return True if we should reply 304 Not Modified.
+static int is_not_modified(const struct mg_connection *conn,
+                           const struct mgstat *stp) {
+  const char *ims = mg_get_header(conn, "If-Modified-Since");
+  return ims != NULL && stp->mtime <= parse_date_string(ims);
+}
+
+static int forward_body_data(struct mg_connection *conn, FILE *fp,
+                             SOCKET sock, SSL *ssl) {
+  const char *expect, *buffered;
+  char buf[BUFSIZ];
+  int to_read, nread, buffered_len, success = 0;
+
+  expect = mg_get_header(conn, "Expect");
+  assert(fp != NULL);
+
+  if (conn->content_len == -1) {
+    send_http_error(conn, 411, "Length Required", "");
+  } else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) {
+    send_http_error(conn, 417, "Expectation Failed", "");
+  } else {
+    if (expect != NULL) {
+      (void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n");
+    }
+
+    buffered = conn->buf + conn->request_len;
+    buffered_len = conn->data_len - conn->request_len;
+    assert(buffered_len >= 0);
+    assert(conn->consumed_content == 0);
+
+    if (buffered_len > 0) {
+      if ((int64_t) buffered_len > conn->content_len) {
+        buffered_len = (int) conn->content_len;
+      }
+      push(fp, sock, ssl, buffered, (int64_t) buffered_len);
+      conn->consumed_content += buffered_len;
+    }
+
+    while (conn->consumed_content < conn->content_len) {
+      to_read = sizeof(buf);
+      if ((int64_t) to_read > conn->content_len - conn->consumed_content) {
+        to_read = (int) (conn->content_len - conn->consumed_content);
+      }
+      nread = pull(NULL, conn->client.sock, conn->ssl, buf, to_read);
+      if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) {
+        break;
+      }
+      conn->consumed_content += nread;
+    }
+
+    if (conn->consumed_content == conn->content_len) {
+      success = 1;
+    }
+
+    // Each error code path in this function must send an error
+    if (!success) {

[... 1510 lines stripped ...]


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