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From hinde...@apache.org
Subject svn commit: r539793 [3/4] - in /harmony/enhanced/classlib/trunk: depends/build/ make/ modules/archive/ modules/archive/src/main/native/archive/shared/ modules/archive/src/main/native/archive/unix/ modules/archive/src/main/native/archive/windows/ module...
Date Sat, 19 May 2007 19:22:03 GMT
Added: harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/shared/zipsup.c
URL: http://svn.apache.org/viewvc/harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/shared/zipsup.c?view=auto&rev=539793
==============================================================================
--- harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/shared/zipsup.c (added)
+++ harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/shared/zipsup.c Sat May 19 12:22:00 2007
@@ -0,0 +1,2302 @@
+/* 
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file
+ * @ingroup ZipSupport
+ * @brief Zip Support for Java VM
+*/
+
+#include <string.h>
+
+#include "hyport.h"
+#include "zipsup.h"
+#include "hyzipnls.h"
+
+#include "zlib.h"
+
+/* Globals for the zip library */
+UDATA zipDLLDescriptor = 0;
+int (*inflateInit2Func) (void *, int, const char *, int);
+int (*inflateFunc) (void *, int);
+int (*inflateEndFunc) (void *);
+
+#define ZIP_NEXT_U8(value, index) (value = *(index++))
+#define ZIP_NEXT_U16(value, index) ((value = (index[1] << 8) | index[0]), index += 2, value)
+#define ZIP_NEXT_U32(value, index) ((value = ((U_32)index[3] << 24) | ((U_32)index[2] << 16) | ((U_32)index[1] << 8) | (U_32)index[0]), index += 4, value)
+
+#define WORK_BUFFER_SIZE 64000
+
+#define SCAN_CHUNK_SIZE 1024
+
+struct workBuffer
+{
+  HyPortLibrary *portLib;
+  UDATA *bufferStart;
+  UDATA *bufferEnd;
+  UDATA *currentAlloc;
+  UDATA cntr;
+};
+
+#define CDEV_CURRENT_FUNCTION _prototypes_private
+I_32 zip_populateCache
+PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile));
+
+static I_32 inflateData
+PROTOTYPE ((struct workBuffer * workBuf, U_8 * inputBuffer,
+            U_32 inputBufferSize, U_8 * outputBuffer, U_32 outputBufferSize));
+
+I_32 checkZipLibrary PROTOTYPE ((HyPortLibrary * portLib));
+
+I_32 scanForDataDescriptor
+PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile,
+            HyZipEntry * zipEntry));
+void zdatafree PROTOTYPE ((void *opaque, void *address));
+static I_32 readZipEntry
+PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile,
+            HyZipEntry * zipEntry, const char *filename,
+            IDATA * enumerationPointer, IDATA * entryStart,
+            BOOLEAN findDirectory));
+I_32 scanForCentralEnd
+PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile,
+            HyZipCentralEnd * endEntry));
+void *zdataalloc PROTOTYPE ((void *opaque, U_32 items, U_32 size));
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION _prototypes_public
+I_32 zip_getZipEntryData
+PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile, HyZipEntry * entry,
+            U_8 * buffer, U_32 bufferSize));
+I_32 zip_getZipEntryFromOffset
+PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile, HyZipEntry * entry,
+            IDATA offset));
+I_32 zip_establishCache
+PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile));
+void zip_resetZipFile
+PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile,
+            IDATA * nextEntryPointer));
+I_32 zip_getNextZipEntry
+PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile,
+            HyZipEntry * zipEntry, IDATA * nextEntryPointer));
+I_32 zip_getZipEntry
+PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile, HyZipEntry * entry,
+            const char *filename, BOOLEAN findDirectory));
+I_32 zip_getZipEntryExtraField
+PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile, HyZipEntry * entry,
+            U_8 * buffer, U_32 bufferSize));
+void zip_initZipEntry
+PROTOTYPE ((HyPortLibrary * portLib, HyZipEntry * entry));
+I_32 zip_openZipFile
+PROTOTYPE ((HyPortLibrary * portLib, char *filename, HyZipFile * zipFile,
+            HyZipCachePool * cachePool));
+void zip_freeZipEntry
+PROTOTYPE ((HyPortLibrary * portLib, HyZipEntry * entry));
+I_32 VMCALL zip_closeZipFile
+PROTOTYPE ((HyPortLibrary * portLib, struct HyZipFile * zipFile));
+I_32 zip_getZipEntryComment
+PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile, HyZipEntry * entry,
+            U_8 * buffer, U_32 bufferSize));
+
+#undef CDEV_CURRENT_FUNCTION
+
+#include "hythread.h"
+#define ENTER() hythread_monitor_enter(hythread_global_monitor())
+#define EXIT() hythread_monitor_exit(hythread_global_monitor())
+
+#define CDEV_CURRENT_FUNCTION checkZipLibrary
+
+/*
+	Ensure that the zip library is loaded.
+	Return 0 on success, -1 on failure.
+*/
+I_32
+checkZipLibrary (HyPortLibrary * portLib)
+{
+  PORT_ACCESS_FROM_PORT (portLib);
+
+  /* if the library has already been loaded return success/failure */
+  if (zipDLLDescriptor > 1)
+    return 0;
+  if (zipDLLDescriptor == 1)
+    return -1;
+
+  /* open up the zip library by name */
+
+  if (hysl_open_shared_library (HY_ZIP_DLL_NAME, &zipDLLDescriptor, TRUE))
+    goto openFailed;
+
+  /* look up the functions */
+  if (hysl_lookup_name
+      (zipDLLDescriptor, "inflateInit2_", (void *) &inflateInit2Func,
+       "ILILI"))
+    goto loadFailed;
+  if (hysl_lookup_name
+      (zipDLLDescriptor, "inflate", (void *) &inflateFunc, "IPI"))
+    goto loadFailed;
+  if (hysl_lookup_name
+      (zipDLLDescriptor, "inflateEnd", (void *) &inflateEndFunc, "IP"))
+    goto loadFailed;
+
+  /* good to go */
+  return 0;
+
+loadFailed:
+  hysl_close_shared_library (zipDLLDescriptor);
+
+  /* mark the descriptor as a failed load. only report the error once */
+  zipDLLDescriptor = 1;
+
+  /* Unable to open %s (Missing export) */
+  hynls_printf (PORTLIB, HYNLS_WARNING, HYNLS_ZIP_MISSING_EXPORT,
+                HY_ZIP_DLL_NAME);
+
+  return -1;
+
+openFailed:
+  /* mark the descriptor as a failed load. only report the error once */
+  zipDLLDescriptor = 1;
+
+  /* Unable to open %s (%s) */
+  hynls_printf (PORTLIB, HYNLS_WARNING, HYNLS_ZIP_UNABLE_TO_OPEN_ZIP_DLL,
+                HY_ZIP_DLL_NAME, hyerror_last_error_message ());
+  return -1;
+}
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION inflateData
+
+/*
+	Returns 0 on success or one of the following:
+			ZIP_ERR_UNSUPPORTED_FILE_TYPE
+			ZIP_ERR_FILE_CORRUPT
+			ZIP_ERR_OUT_OF_MEMORY
+			ZIP_ERR_INTERNAL_ERROR
+*/
+static I_32
+inflateData (struct workBuffer *workBuf, U_8 * inputBuffer,
+             U_32 inputBufferSize, U_8 * outputBuffer, U_32 outputBufferSize)
+{
+  PORT_ACCESS_FROM_PORT (workBuf->portLib);
+
+  z_stream stream;
+  I_32 err;
+
+  stream.next_in = inputBuffer;
+  stream.avail_in = inputBufferSize;
+  stream.next_out = outputBuffer;
+  stream.avail_out = outputBufferSize;
+
+  stream.opaque = workBuf;
+  stream.zalloc = zdataalloc;
+  stream.zfree = zdatafree;
+
+  /* Initialize stream. Pass "-15" as max number of window bits, negated
+     to indicate that no zlib header is present in the data. */
+  err = inflateInit2Func (&stream, -15, ZLIB_VERSION, sizeof (z_stream));
+  if (err != Z_OK)
+    return -1;
+
+  /* Inflate the data. */
+  err = inflateFunc (&stream, Z_SYNC_FLUSH);
+
+  /* Clean up the stream. */
+  inflateEndFunc (&stream);
+
+  /* Check the return code. Did we complete the inflate? */
+  if ((err == Z_STREAM_END) || (err == Z_OK))
+    {
+      if (stream.total_out == outputBufferSize)
+        {
+          return 0;
+        }
+    }
+
+  switch (err)
+    {
+    case Z_OK:                 /* an error if file is incomplete */
+    case Z_STREAM_END:         /* an error if file is incomplete */
+    case Z_ERRNO:              /* a random error */
+    case Z_STREAM_ERROR:       /* stream inconsistent */
+    case Z_DATA_ERROR:         /* corrupted zip */
+      return ZIP_ERR_FILE_CORRUPT;
+
+    case Z_VERSION_ERROR:      /* wrong zlib version */
+    case Z_NEED_DICT:          /* needs a preset dictionary that we can't provide */
+      return ZIP_ERR_UNSUPPORTED_FILE_TYPE;
+
+    case Z_MEM_ERROR:          /* out of memory */
+      return ZIP_ERR_OUT_OF_MEMORY;
+
+    case Z_BUF_ERROR:          /* no progress / out of output buffer */
+    default:                   /* jic */
+      return ZIP_ERR_INTERNAL_ERROR;
+    }
+}
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION scanForCentralEnd
+/*
+	Scan backward from end of file for a central end header. Read from zipFile and update the HyZipCentralEnd provided.
+
+	Returns 0 on success or one of the following:
+			ZIP_ERR_FILE_READ_ERROR
+			ZIP_ERR_FILE_CORRUPT
+*/
+I_32
+scanForCentralEnd (HyPortLibrary * portLib, HyZipFile * zipFile,
+                   HyZipCentralEnd * endEntry)
+{
+  U_8 *current;
+  U_8 buffer[SCAN_CHUNK_SIZE];
+  I_32 i, size, state;
+  U_32 dataSize = 0;
+  I_64 seekResult;
+  I_32 fileSize;
+  I_32 bytesAlreadyRead = 0;
+
+  PORT_ACCESS_FROM_PORT (portLib);
+
+  /* Haven't seen anything yet. */
+  state = 0;
+
+  seekResult = hyfile_seek (zipFile->fd, 0, HySeekEnd);
+  if ((seekResult < 0) || (seekResult > HYCONST64 (0x7FFFFFFF)))
+    {
+      zipFile->pointer = -1;
+      return ZIP_ERR_FILE_READ_ERROR;
+    }
+  fileSize = (I_32) seekResult;
+  zipFile->pointer = fileSize;
+
+  while (TRUE)
+    {
+      /* Fill the buffer. */
+      if (bytesAlreadyRead == fileSize)
+        {
+          zipFile->pointer = -1;
+          return ZIP_ERR_FILE_CORRUPT;
+        }
+
+      size = SCAN_CHUNK_SIZE;
+      if (size > fileSize - bytesAlreadyRead)
+        size = fileSize - bytesAlreadyRead;
+      bytesAlreadyRead += size;
+      seekResult =
+        hyfile_seek (zipFile->fd, fileSize - bytesAlreadyRead, HySeekSet);
+      if ((seekResult < 0) || (seekResult > HYCONST64 (0x7FFFFFFF)))
+        {
+          zipFile->pointer = -1;
+          return ZIP_ERR_FILE_READ_ERROR;
+        }
+      zipFile->pointer = (I_32) seekResult;
+
+      if (hyfile_read (zipFile->fd, buffer, size) != size)
+        {
+          zipFile->pointer = -1;
+          return ZIP_ERR_FILE_READ_ERROR;
+        }
+      zipFile->pointer += size;
+
+      /* Scan the buffer (backwards) for CentralEnd signature = PK^E^F. */
+      for (i = size; i--; dataSize++)
+        {
+          switch (state)
+            {
+            case 0:
+              /* Nothing yet. */
+              if (buffer[i] == 6)
+                state = 1;
+              break;
+
+            case 1:
+              /* Seen ^F */
+              if (buffer[i] == 5)
+                state = 2;
+              else
+                state = 0;
+              break;
+
+            case 2:
+              /* Seen ^E^F */
+              if (buffer[i] == 'K')
+                state = 3;
+              else
+                state = 0;
+              break;
+
+            case 3:
+              /* Seen K^E^F */
+              if (buffer[i] == 'P' && dataSize >= 21)
+                {
+                  /* Found it.  Read the data from the end-of-central-dir record. */
+                  current = buffer + i + 4;
+                  ZIP_NEXT_U16 (endEntry->diskNumber, current);
+                  ZIP_NEXT_U16 (endEntry->dirStartDisk, current);
+                  ZIP_NEXT_U16 (endEntry->thisDiskEntries, current);
+                  ZIP_NEXT_U16 (endEntry->totalEntries, current);
+                  ZIP_NEXT_U32 (endEntry->dirSize, current);
+                  ZIP_NEXT_U32 (endEntry->dirOffset, current);
+                  ZIP_NEXT_U16 (endEntry->commentLength, current);
+
+                  /* Quick test to ensure that the header isn't invalid. 
+                     Current dataSize is the number of bytes of data scanned, up to the ^H in the stream. */
+                  if (dataSize >= (U_32) (21 + endEntry->commentLength))
+                    return 0;
+
+                  /* Header looked invalid. Pretend we didn't see it and keep scanning.. */
+                }
+              state = 0;
+              break;
+            }
+        }
+    }
+}
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION scanForDataDescriptor
+/*
+	Scan ahead for a data descriptor. Read from zipFile and update the HyZipLocalHeader provided.
+
+	Returns 0 on success or one of the following:
+			ZIP_ERR_FILE_READ_ERROR
+			ZIP_ERR_FILE_CORRUPT
+*/
+I_32
+scanForDataDescriptor (HyPortLibrary * portLib, HyZipFile * zipFile,
+                       HyZipEntry * zipEntry)
+{
+  U_8 *current;
+  U_8 buffer[SCAN_CHUNK_SIZE], descriptor[16];
+  I_32 i, size, state;
+  U_32 dataSize, blockPointer;
+  I_64 seekResult;
+
+  PORT_ACCESS_FROM_PORT (portLib);
+
+  /* Skip ahead and read the data descriptor. The compressed size should be 0. */
+  if (zipFile->pointer !=
+      (IDATA) (zipEntry->dataPointer + zipEntry->compressedSize))
+    {
+      seekResult =
+        hyfile_seek (zipFile->fd,
+                     zipEntry->dataPointer + zipEntry->compressedSize,
+                     HySeekSet);
+      if ((seekResult < 0) || (seekResult > HYCONST64 (0x7FFFFFFF)))
+        {
+          zipFile->pointer = -1;
+          return ZIP_ERR_FILE_READ_ERROR;
+        }
+      zipFile->pointer = (I_32) seekResult;
+    }
+
+  /* Haven't seen anything yet. */
+  blockPointer = dataSize = zipEntry->compressedSize;
+  state = 0;
+
+  /* Scan until we find PK^G^H (otherwise it's an error). */
+  while (1)
+    {
+      /* Fill the buffer. */
+      size = hyfile_read (zipFile->fd, buffer, SCAN_CHUNK_SIZE);
+      if (size == 0)
+        {
+          return ZIP_ERR_FILE_CORRUPT;
+        }
+      else if (size < 0)
+        {
+          zipFile->pointer = -1;
+          return ZIP_ERR_FILE_READ_ERROR;
+        }
+      zipFile->pointer += size;
+      blockPointer += size;
+
+      /* Scan the buffer. */
+      for (i = 0; i < size; i++, dataSize++)
+        {
+          switch (state)
+            {
+            case 0:
+              /* Nothing yet. */
+              if (buffer[i] == 'P')
+                {
+                  state = 1;
+                }
+              break;
+
+            case 1:
+              /* Seen P */
+              if (buffer[i] == 'K')
+                {
+                  state = 2;
+                }
+              else
+                state = 0;
+              break;
+
+            case 2:
+              /* Seen PK */
+              if (buffer[i] == 7)
+                {
+                  state = 3;
+                }
+              else
+                {
+                  state = 0;
+                }
+              break;
+
+            case 3:
+              /* Seen PK^G */
+              if (buffer[i] == 8)
+                {
+                  /* Found it! Read the descriptor */
+                  if (i + 12 < size)
+                    {
+                      current = &buffer[i + 1];
+                    }
+                  else
+                    {
+                      seekResult =
+                        hyfile_seek (zipFile->fd,
+                                     zipEntry->dataPointer + dataSize + 1,
+                                     HySeekSet);
+                      if ((seekResult < 0)
+                          || (seekResult > HYCONST64 (0x7FFFFFFF)))
+                        {
+                          zipFile->pointer = -1;
+                          return ZIP_ERR_FILE_READ_ERROR;
+                        }
+                      zipFile->pointer = (I_32) seekResult;
+                      if (hyfile_read (zipFile->fd, descriptor, 12) != 12)
+                        {
+                          zipFile->pointer = -1;
+                          return ZIP_ERR_FILE_READ_ERROR;
+                        }
+                      zipFile->pointer += 12;
+                      current = descriptor;
+                    }
+
+                  /* Read the data from the descriptor. */
+                  ZIP_NEXT_U32 (zipEntry->crc32, current);
+                  ZIP_NEXT_U32 (zipEntry->compressedSize, current);
+                  ZIP_NEXT_U32 (zipEntry->uncompressedSize, current);
+
+                  /* Quick test to ensure that the header isn't invalid. 
+                     Current dataSize is the number of bytes of data scanned, up to the ^H in the stream. */
+                  if (dataSize - 3 == zipEntry->compressedSize)
+                    {
+                      return 0;
+                    }
+
+                  /* Header looked invalid. Reset the pointer and continue scanning. */
+                  seekResult =
+                    hyfile_seek (zipFile->fd,
+                                 zipEntry->dataPointer + blockPointer,
+                                 HySeekSet);
+                  if ((seekResult < 0)
+                      || (seekResult > HYCONST64 (0x7FFFFFFF)))
+                    {
+                      zipFile->pointer = -1;
+                      return ZIP_ERR_FILE_READ_ERROR;
+                    }
+                  zipFile->pointer = (I_32) seekResult;
+                }
+              else
+                state = 0;
+              break;
+            }
+        }
+    }
+}
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION zip_populateCache
+/*
+	Fill in the cache of a given zip file.  This should only be called once during zip_openZipFile!
+
+	Returns 0 on success or one of the following:
+			ZIP_ERR_FILE_READ_ERROR
+			ZIP_ERR_FILE_OPEN_ERROR
+			ZIP_ERR_UNKNOWN_FILE_TYPE
+			ZIP_ERR_UNSUPPORTED_FILE_TYPE
+			ZIP_ERR_OUT_OF_MEMORY
+			ZIP_ERR_INTERNAL_ERROR
+*/
+I_32
+zip_populateCache (HyPortLibrary * portLib, HyZipFile * zipFile)
+{
+  PORT_ACCESS_FROM_PORT (portLib);
+
+  I_32 result = 0;
+  IDATA bufferSize = 65536;
+  IDATA unreadSize = 0;
+  IDATA bufferedSize = 0;
+  IDATA bytesToRead = 0;
+  IDATA filenameCopied;
+  HyZipEntry entry;
+  HyZipCentralEnd endEntry;
+  U_8 *buffer = NULL;
+  U_8 *filename = NULL;
+  IDATA filenameSize = 256;     /* Should be sufficient for most filenames */
+  U_8 *current;
+  U_32 sig;
+  U_32 localHeaderOffset;
+  IDATA startCentralDir;
+  I_64 seekResult;
+
+  if (!zipFile->cache)
+    return ZIP_ERR_INTERNAL_ERROR;
+
+  /* Find and read the end-of-central-dir record. */
+  result = scanForCentralEnd (portLib, zipFile, &endEntry);
+  if (result != 0)
+    return result;
+
+  unreadSize = endEntry.dirSize + 4 /* slop */ ;
+#ifndef HY_ZIP_API
+  zipFile->cache->startCentralDir = startCentralDir =
+#else /* HY_ZIP_API */
+  ((HyZipCache *)(zipFile->cache))->startCentralDir = startCentralDir =
+#endif /* HY_ZIP_API */
+    (IDATA) ((UDATA) endEntry.dirOffset);
+
+  if (zipFile->pointer != startCentralDir)
+    {
+      seekResult = hyfile_seek (zipFile->fd, startCentralDir, HySeekSet);
+      if ((seekResult < 0) || (seekResult > HYCONST64 (0x7FFFFFFF)))
+        {
+          zipFile->pointer = -1;
+          result = ZIP_ERR_FILE_READ_ERROR;
+          goto finished;
+        }
+
+      zipFile->pointer = (I_32) seekResult;
+      if (zipFile->pointer != startCentralDir)
+        {
+          result = ZIP_ERR_FILE_READ_ERROR;
+          zipFile->pointer = -1;
+          goto finished;
+        }
+    }
+
+  /* No point in allocating more than we'll actually need.. */
+  if (bufferSize > unreadSize)
+    bufferSize = unreadSize;
+
+  filename = hymem_allocate_memory (filenameSize);
+  if (!filename)
+    {
+      result = ZIP_ERR_OUT_OF_MEMORY;
+      goto finished;
+    }
+
+  /* Allocate some space to hold central directory goo as we eat through it */
+  buffer = hymem_allocate_memory (bufferSize);
+  if (!buffer && (bufferSize > 4096))
+    {
+      /* Not enough memory, fall back to a smaller buffer! */
+      bufferSize = 4096;
+      buffer = hymem_allocate_memory (bufferSize);
+    }
+  if (!buffer)
+    {
+      result = ZIP_ERR_OUT_OF_MEMORY;
+      goto finished;
+    }
+
+  while (unreadSize)
+    {
+
+      /* Read as much as needed into buffer. */
+      bytesToRead = bufferSize - bufferedSize;
+      if (bytesToRead > unreadSize)
+        bytesToRead = unreadSize;
+      result = hyfile_read (zipFile->fd, buffer + bufferedSize, bytesToRead);
+      if (result < 0)
+        {
+          result = ZIP_ERR_FILE_READ_ERROR;
+          zipFile->pointer = -1;
+          goto finished;
+        }
+      zipFile->pointer += result;
+      unreadSize -= result;
+      bufferedSize += result;
+      current = buffer;
+
+      /* consume entries until we run out. */
+      while (current + 46 < buffer + bufferedSize)
+        {
+          IDATA entryPointer;
+
+          entryPointer =
+            zipFile->pointer + (current - (buffer + bufferedSize));
+
+          sig = 0;
+          ZIP_NEXT_U32 (sig, current);
+          if (sig == ZIP_CentralEnd)
+            {
+              /* We're done here. */
+              result = 0;
+              goto finished;
+            }
+          if (sig != ZIP_CentralHeader)
+            {
+              /* Umm...What the Hell? */
+              result = ZIP_ERR_FILE_CORRUPT;
+              goto finished;
+            }
+
+          /* Read ZIP_CentralHeader entry */
+          ZIP_NEXT_U16 (entry.versionCreated, current);
+          ZIP_NEXT_U16 (entry.versionNeeded, current);
+          ZIP_NEXT_U16 (entry.flags, current);
+          ZIP_NEXT_U16 (entry.compressionMethod, current);
+          ZIP_NEXT_U16 (entry.lastModTime, current);
+          ZIP_NEXT_U16 (entry.lastModDate, current);
+          ZIP_NEXT_U32 (entry.crc32, current);
+          ZIP_NEXT_U32 (entry.compressedSize, current);
+          ZIP_NEXT_U32 (entry.uncompressedSize, current);
+          ZIP_NEXT_U16 (entry.filenameLength, current);
+          ZIP_NEXT_U16 (entry.extraFieldLength, current);
+          ZIP_NEXT_U16 (entry.fileCommentLength, current);
+          current += sizeof (U_16);     /* skip disk number field */
+          ZIP_NEXT_U16 (entry.internalAttributes, current);
+          current += sizeof (U_32);     /* skip external attributes field */
+          ZIP_NEXT_U32 (localHeaderOffset, current);
+
+          /* Increase filename buffer size if necessary. */
+          if (filenameSize < entry.filenameLength + 1)
+            {
+              hymem_free_memory (filename);
+              filenameSize = entry.filenameLength + 1;
+              filename = hymem_allocate_memory (filenameSize);
+              if (!filename)
+                {
+                  result = ZIP_ERR_OUT_OF_MEMORY;
+                  goto finished;
+                }
+            }
+
+          filenameCopied = 0;
+          while (filenameCopied < entry.filenameLength)
+            {
+              IDATA size;
+              /* Copy as much of the filename as we can see in the buffer (probably the whole thing). */
+
+              size = entry.filenameLength - filenameCopied;
+              if (size > bufferedSize - (current - buffer))
+                {
+                  size = bufferedSize - (current - buffer);
+                }
+              memcpy (filename + filenameCopied, current, size);
+              filenameCopied += size;
+              current += size;
+              if (filenameCopied >= entry.filenameLength)
+                break;          /* done */
+
+              /* Otherwise, we ran out of source string.  Load another chunk.. */
+              bufferedSize = 0;
+              if (!unreadSize)
+                {
+                  /* Central header is supposedly done?  Bak */
+                  result = ZIP_ERR_FILE_CORRUPT;
+                  goto finished;
+                }
+              bytesToRead = bufferSize - bufferedSize;
+              if (bytesToRead > unreadSize)
+                bytesToRead = unreadSize;
+              result =
+                hyfile_read (zipFile->fd, buffer + bufferedSize, bytesToRead);
+              if (result < 0)
+                {
+                  result = ZIP_ERR_FILE_READ_ERROR;
+                  zipFile->pointer = -1;
+                  goto finished;
+                }
+              zipFile->pointer += result;
+              unreadSize -= result;
+              bufferedSize += result;
+              current = buffer;
+            }
+          filename[entry.filenameLength] = '\0';        /* null-terminate */
+
+          if (((entry.compressionMethod == ZIP_CM_Deflated)
+               && (entry.flags & 0x8)) || (entry.fileCommentLength != 0))
+            {
+              /* Either local header doesn't know the compressedSize, or this entry has a file
+                 comment.  In either case, cache the central header instead of the local header
+                 so we can find the information we need later. */
+
+              result =
+                zipCache_addElement (zipFile->cache, (char *) filename,
+                                     entryPointer);
+
+            }
+          else
+            {
+              result =
+                zipCache_addElement (zipFile->cache, (char *) filename,
+                                     localHeaderOffset);
+            }
+
+          if (!result)
+            {
+              result = ZIP_ERR_OUT_OF_MEMORY;
+              goto finished;
+            }
+
+          /* Skip the data and comment. */
+          bytesToRead = entry.extraFieldLength + entry.fileCommentLength;
+          if (bufferedSize - (current - buffer) >= bytesToRead)
+            {
+              current += bytesToRead;
+            }
+          else
+            {
+              /* The rest of the buffer is uninteresting.  Skip ahead to where the good stuff is */
+              bytesToRead -= (bufferedSize - (current - buffer));
+              current = buffer + bufferedSize;
+              unreadSize -= bytesToRead;
+
+              seekResult = hyfile_seek (zipFile->fd, bytesToRead, HySeekCur);
+              if ((seekResult < 0) || (seekResult > HYCONST64 (0x7FFFFFFF)))
+                {
+                  zipFile->pointer = -1;
+                  result = ZIP_ERR_FILE_READ_ERROR;
+                  goto finished;
+                }
+              zipFile->pointer = (I_32) seekResult;
+            }
+        }
+      bufferedSize -= (current - buffer);
+      memmove (buffer, current, bufferedSize);
+    }
+
+  result = 0;
+
+finished:
+  if (filename)
+    hymem_free_memory (filename);
+  if (buffer)
+    hymem_free_memory (buffer);
+  return result;
+}
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION readZipEntry
+/*
+	Read the next zip entry for the zipFile into the zipEntry provided.  If filename is non-NULL, it is expected to match
+	the filename read for the entry.  If (cachePointer != -1) the filename of the entry will be looked up in the cache (assuming
+	there is one) to help detect use of an invalid cache.  If enumerationPointer is non-NULL, sequential access is assumed and
+	either a local zip entry or a data descriptor will be accepted, but a central zip entry will cause ZIP_ERR_NO_MORE_ENTRIES
+	to be returned.  If enumerationPointer is NULL, random access is assumed and either a local zip entry or a central zip
+	entry will be accepted.
+
+	Returns 0 on success or one of the following:
+			ZIP_ERR_FILE_READ_ERROR
+			ZIP_ERR_FILE_CORRUPT
+			ZIP_ERR_OUT_OF_MEMORY
+			ZIP_ERR_NO_MORE_ENTRIES
+*/
+static I_32
+readZipEntry (HyPortLibrary * portLib, HyZipFile * zipFile,
+              HyZipEntry * zipEntry, const char *filename,
+              IDATA * enumerationPointer, IDATA * entryStart,
+              BOOLEAN findDirectory)
+{
+  PORT_ACCESS_FROM_PORT (portLib);
+
+  I_32 result;
+  U_8 buffer[46 + 128];
+  U_8 *current;
+  U_32 sig;
+  IDATA readLength;
+  I_64 seekResult;
+  U_8 *readBuffer;
+  IDATA currentEntryPointer, localEntryPointer;
+  IDATA headerSize;
+  IDATA filenameLength = filename ? strlen (filename) : 0;
+
+retry:
+  if (entryStart)
+    *entryStart = zipFile->pointer;
+  readBuffer = NULL;
+  /* Guess how many bytes we'll need to read.  If we guess correctly we will do fewer I/O operations */
+  headerSize = 30;              /* local zip header size */
+#ifndef HY_ZIP_API
+  if (zipFile->cache && (zipFile->pointer >= zipFile->cache->startCentralDir))
+#else /* HY_ZIP_API */
+  if (zipFile->cache && (zipFile->pointer >= ((HyZipCache *)(zipFile->cache))->startCentralDir))
+#endif /* HY_ZIP_API */
+    {
+      headerSize = 46;          /* central zip header size */
+    }
+  readLength = headerSize + (filename ? filenameLength : 128);
+  if (findDirectory)
+    {
+      /* Extra byte for possible trailing '/' */
+      readLength++;
+    }
+
+  /* Allocate some memory if necessary */
+  if (readLength <= sizeof (buffer))
+    {
+      current = buffer;
+    }
+  else
+    {
+      current = readBuffer = hymem_allocate_memory (readLength);
+      if (!readBuffer)
+        return ZIP_ERR_OUT_OF_MEMORY;
+    }
+
+  currentEntryPointer = localEntryPointer = zipFile->pointer;
+
+  result = hyfile_read (zipFile->fd, current, readLength);
+  if ((result < 22)
+      || (filename
+          && !(result == readLength
+               || (findDirectory && result == (readLength - 1)))))
+    {
+      /* We clearly didn't get enough bytes */
+      result = ZIP_ERR_FILE_READ_ERROR;
+      goto finished;
+    }
+  zipFile->pointer += result;
+  readLength = result;          /* If it's not enough, we'll catch that later */
+  ZIP_NEXT_U32 (sig, current);
+
+  if (enumerationPointer)
+    {
+      if ((sig == ZIP_CentralEnd))
+        {
+          result = ZIP_ERR_NO_MORE_ENTRIES;
+          goto finished;
+        }
+    }
+  if ((enumerationPointer || (!zipFile->cache))
+      && (sig == ZIP_DataDescriptor))
+    {
+      /* We failed to predict a data descriptor here.  This should be an error (i.e. only happens in malformed zips?) 
+         but, but we will silently skip over it */
+      seekResult =
+        hyfile_seek (zipFile->fd, currentEntryPointer + 16, HySeekSet);
+      if ((seekResult < 0) || (seekResult > HYCONST64 (0x7FFFFFFF)))
+        {
+          zipFile->pointer = -1;
+          result = ZIP_ERR_FILE_READ_ERROR;
+          goto finished;
+        }
+      zipFile->pointer = (I_32) seekResult;
+
+      if (zipFile->pointer == currentEntryPointer + 16)
+        {
+          if (readBuffer)
+            {
+              hymem_free_memory (readBuffer);
+            }
+          goto retry;
+        }
+      result = ZIP_ERR_FILE_READ_ERROR;
+      goto finished;
+    }
+
+  if ((sig != ZIP_CentralHeader) && (sig != ZIP_LocalHeader))
+    {
+      /* Unexpected. */
+      result = ZIP_ERR_FILE_CORRUPT;
+      goto finished;
+    }
+  headerSize = ((sig == ZIP_CentralHeader) ? 46 : 30);
+  if (readLength < headerSize)
+    {
+      /* We didn't get the whole header (and none of the filename).. */
+      /* NOTE: this could happen in normal use if the assumed filename length above is <16.  Since it's 128, we don't 
+         handle the impossible case where we would have to read more header.  It could also happen if the caller
+         supplied a filename of length <16 but that only happens when we have a cache (so we'll know the header size) 
+       */
+      result = ZIP_ERR_FILE_READ_ERROR;
+    }
+  readLength -= headerSize;
+
+  if (sig == ZIP_CentralHeader)
+    {
+      current += 2;             /* skip versionCreated field */
+    }
+  ZIP_NEXT_U16 (zipEntry->versionNeeded, current);
+  ZIP_NEXT_U16 (zipEntry->flags, current);
+  ZIP_NEXT_U16 (zipEntry->compressionMethod, current);
+  ZIP_NEXT_U16 (zipEntry->lastModTime, current);
+  ZIP_NEXT_U16 (zipEntry->lastModDate, current);
+  ZIP_NEXT_U32 (zipEntry->crc32, current);
+  ZIP_NEXT_U32 (zipEntry->compressedSize, current);
+  ZIP_NEXT_U32 (zipEntry->uncompressedSize, current);
+  ZIP_NEXT_U16 (zipEntry->filenameLength, current);
+  ZIP_NEXT_U16 (zipEntry->extraFieldLength, current);
+  zipEntry->fileCommentLength = 0;
+
+  if (sig == ZIP_CentralHeader)
+    {
+      ZIP_NEXT_U16 (zipEntry->fileCommentLength, current);
+      current += 8;             /* skip disk number start + internal attrs + external attrs */
+      ZIP_NEXT_U32 (localEntryPointer, current);
+    }
+
+  if (filename)
+    {
+      if (zipFile->cache)
+        {
+          if (!
+              (readLength == zipEntry->filenameLength
+               || (findDirectory
+                   && (readLength - 1) == zipEntry->filenameLength)))
+            {
+              /* We knew exactly how much we were supposed to read, and this wasn't it */
+              result = ZIP_ERR_FILE_CORRUPT;
+              goto finished;
+            }
+        }
+    }
+
+  /* Allocate space for filename */
+  if (zipEntry->filenameLength >= ZIP_INTERNAL_MAX)
+    {
+      zipEntry->filename =
+        hymem_allocate_memory (zipEntry->filenameLength + 1);
+      if (!zipEntry->filename)
+        {
+          result = ZIP_ERR_OUT_OF_MEMORY;
+          goto finished;
+        }
+    }
+  else
+    {
+      zipEntry->filename = zipEntry->internalFilename;
+    }
+  if (readLength > zipEntry->filenameLength)
+    {
+      readLength = zipEntry->filenameLength;
+    }
+  memcpy (zipEntry->filename, current, readLength);
+
+  /* Read the rest of the filename if necessary.  Allocate space in HyZipEntry for it! */
+  if (readLength < zipEntry->filenameLength)
+    {
+      result =
+        hyfile_read (zipFile->fd, zipEntry->filename + readLength,
+                     zipEntry->filenameLength - readLength);
+      if (result != (zipEntry->filenameLength - readLength))
+        {
+          result = ZIP_ERR_FILE_READ_ERROR;
+          goto finished;
+        }
+      zipFile->pointer += result;
+    }
+  zipEntry->filename[zipEntry->filenameLength] = '\0';
+
+  /* If we know what filename is supposed to be, compare it and make sure it matches */
+  /* Note: CASE-SENSITIVE COMPARE because filenames in zips are case sensitive (even on platforms with
+     case-insensitive file systems) */
+  if (filename)
+    {
+      if (!
+          ((findDirectory && zipEntry->filenameLength == (filenameLength + 1)
+            && zipEntry->filename[filenameLength] == '/'
+            && !strncmp ((char *) zipEntry->filename, (const char *) filename,
+                         filenameLength))
+           || !strcmp ((const char *) zipEntry->filename,
+                       (const char *) filename)))
+        {
+          /* We seem to have read something totally invalid.. */
+          result = ZIP_ERR_FILE_CORRUPT;
+          goto finished;
+        }
+    }
+
+  zipEntry->filenamePointer = currentEntryPointer + headerSize;
+  zipEntry->extraFieldPointer =
+    localEntryPointer + 30 + zipEntry->filenameLength;
+  zipEntry->dataPointer =
+    zipEntry->extraFieldPointer + zipEntry->extraFieldLength;
+  zipEntry->extraField = NULL;
+  zipEntry->fileCommentPointer = 0;
+  zipEntry->fileComment = NULL;
+  zipEntry->data = NULL;
+
+  if (sig == ZIP_CentralHeader)
+    {
+      U_8 buf[2];
+      U_8 *buf2 = buf;
+      U_16 lost;
+      /* Also, we know where the comment is */
+      zipEntry->fileCommentPointer = currentEntryPointer + headerSize +
+        zipEntry->filenameLength + zipEntry->extraFieldLength;
+      if (hyfile_seek (zipFile->fd, localEntryPointer + 28, HySeekSet) ==
+          localEntryPointer + 28)
+        {
+          if (hyfile_read (zipFile->fd, buf, 2) == 2)
+            {
+              ZIP_NEXT_U16 (lost, buf2);
+              zipEntry->dataPointer = zipEntry->extraFieldPointer + lost;
+              zipFile->pointer = localEntryPointer + 30;
+            }
+        }
+    }
+
+  if ((sig == ZIP_LocalHeader)
+      && (zipEntry->compressionMethod == ZIP_CM_Deflated)
+      && (zipEntry->flags & 0x8))
+    {
+      /* What we just read doesn't tell us how big the compressed data is.  We have to do a heuristic search for a
+         valid data descriptor at the end of the compressed text */
+      result = scanForDataDescriptor (portLib, zipFile, zipEntry);
+      if (result < 0)
+        goto finished;
+    }
+
+  /* Entry read successfully */
+
+  if (enumerationPointer)
+    {
+      /* Work out where the next entry is supposed to be */
+      *enumerationPointer =
+        zipEntry->fileCommentPointer + zipEntry->fileCommentLength;
+    }
+
+  if (readBuffer)
+    hymem_free_memory (readBuffer);
+  return 0;
+
+finished:
+  if (readBuffer)
+    {
+      hymem_free_memory (readBuffer);
+    }
+  if ((zipEntry->filename)
+      && (zipEntry->filename != zipEntry->internalFilename))
+    {
+      hymem_free_memory (zipEntry->filename);
+    }
+  zipEntry->filename = NULL;
+  if (result == ZIP_ERR_FILE_READ_ERROR)
+    {
+      zipFile->pointer = -1;
+    }
+  return result;
+}
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION zip_closeZipFile
+/**
+ * Attempt to close the zipfile. 
+ *
+ * @param[in] portLib the port library
+ * @param[in] zipFile The zip file to be closed
+ *
+ * @return 0 on success
+ * @return 	ZIP_ERR_FILE_CLOSE_ERROR if there is an error closing the file
+ * @return 	ZIP_ERR_INTERNAL_ERROR if there is an internal error
+ *
+*/
+I_32 VMCALL
+zip_closeZipFile (HyPortLibrary * portLib, struct HyZipFile * zipFile)
+{
+  PORT_ACCESS_FROM_PORT (portLib);
+#if defined(HY_NO_THR)
+  THREAD_ACCESS_FROM_PORT(portLib);
+#endif /* HY_NO_THR */
+  IDATA fd;
+
+  ENTER ();
+
+  fd = zipFile->fd;
+  zipFile->fd = -1;
+
+  if (zipFile->cache && zipFile->cachePool)
+    {
+      zipCachePool_release (zipFile->cachePool, zipFile->cache);
+      zipFile->cache = NULL;
+    }
+  if ((zipFile->filename) && (zipFile->filename != zipFile->internalFilename))
+    {
+      hymem_free_memory (zipFile->filename);
+    }
+  zipFile->filename = NULL;
+
+  if (fd == -1)
+    {
+      EXIT ();
+      return ZIP_ERR_INTERNAL_ERROR;
+    }
+  if (hyfile_close (fd))
+    {
+      EXIT ();
+      return ZIP_ERR_FILE_CLOSE_ERROR;
+    }
+  EXIT ();
+  return 0;
+}
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION zip_establishCache
+/** 
+ * Called to set up a cache when a zip file is opened with a cachePool but without a cache, or when the
+ *	current cache is found to be invalid in some way.
+ * 
+ * @param[in] portLib the port library
+ * @param[in] zipFile the zip file for which we want to establish a cache
+ * 
+ * The current cache is marked as invalid such that new instances of zip files 
+ * won't try to use it and an attempt is made to establish a new cache.
+ *
+ * @return 0 on success
+ * @return 	ZIP_ERR_FILE_READ_ERROR if there is an error reading from zipFile 
+ * @return	ZIP_ERR_FILE_OPEN_ERROR if is there is an error opening the file 
+ * @return	ZIP_ERR_UNKNOWN_FILE_TYPE if the file type is unknown
+ * @return	ZIP_ERR_UNSUPPORTED_FILE_TYPE if the file type is unsupported
+ * @return	ZIP_ERR_OUT_OF_MEMORY  if there is not enough memory to complete this call
+ * @return	ZIP_ERR_INTERNAL_ERROR if there was an internal error
+*/
+
+I_32
+zip_establishCache (HyPortLibrary * portLib, HyZipFile * zipFile)
+{
+  PORT_ACCESS_FROM_PORT (portLib);
+  I_32 result;
+  I_64 timeStamp, actualFileSize;
+  IDATA fileSize, filenameLength;
+
+  if (zipFile->cache)
+    {
+      if (zipFile->cachePool)
+        {
+          /* Whack cache timestamp to keep other people from starting to use it (we will create a new one for them
+             to start to use instead).  Once all the current users of the cache have stopped using it, it will go away */
+#ifndef HY_ZIP_API
+          zipFile->cache->zipTimeStamp = -2;
+#else /* HY_ZIP_API */
+    	  ((HyZipCache *)(zipFile->cache))->zipTimeStamp = -2;
+#endif /* HY_ZIP_API */
+          zipCachePool_release (zipFile->cachePool, zipFile->cache);
+        }
+      zipFile->cache = NULL;
+    }
+  if (!zipFile->cachePool)
+    {
+      return ZIP_ERR_INTERNAL_ERROR;
+    }
+
+  /* Check the cachePool for a suitable cache. */
+  filenameLength = strlen ((const char *) zipFile->filename);
+  timeStamp = hyfile_lastmod ((const char *) zipFile->filename);
+  actualFileSize = hyfile_length ((const char *) zipFile->filename);
+  if ((actualFileSize < 0) || (actualFileSize > HYCONST64 (0x7FFFFFFF)))
+    {
+      return ZIP_ERR_INTERNAL_ERROR;
+    }
+  fileSize = (IDATA) actualFileSize;
+
+  zipFile->cache =
+    zipCachePool_findCache (zipFile->cachePool,
+                            (const char *) zipFile->filename, filenameLength,
+                            fileSize, timeStamp);
+  if (!zipFile->cache)
+    {
+      /* Build a new cache.  Because caller asked for a cache, fail if we can't provide one */
+      zipFile->cache =
+        zipCache_new (portLib, (char *) zipFile->filename, filenameLength);
+      if (!zipFile->cache)
+        return ZIP_ERR_OUT_OF_MEMORY;
+
+#ifndef HY_ZIP_API
+      zipFile->cache->zipFileSize = fileSize;
+      zipFile->cache->zipTimeStamp = timeStamp;
+#else /* HY_ZIP_API */
+      ((HyZipCache *)(zipFile->cache))->zipFileSize = fileSize;
+      ((HyZipCache *)(zipFile->cache))->zipTimeStamp = timeStamp;
+#endif /* HY_ZIP_API */
+
+      result = zip_populateCache (portLib, zipFile);
+      if (result != 0)
+        {
+          zipCache_kill (zipFile->cache);
+          zipFile->cache = NULL;
+          return result;
+        }
+      if (!zipCachePool_addCache (zipFile->cachePool, zipFile->cache))
+        {
+          zipCache_kill (zipFile->cache);
+          zipFile->cache = NULL;
+          return ZIP_ERR_OUT_OF_MEMORY;
+        }
+    }
+  return 0;
+}
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION zip_initZipEntry
+/**
+ * Initialize a zip entry.
+ * 
+ * Should be called before the entry is passed to any other zip support functions 
+ *
+ * @param[in] portLib the port library
+ * @param[in] entry the zip entry to init
+ *
+ * @return none
+*/
+
+void
+zip_initZipEntry (HyPortLibrary * portLib, HyZipEntry * entry)
+{
+  memset (entry, 0, sizeof (*entry));
+}
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION zip_freeZipEntry
+/**
+ * Free any memory associated with a zip entry.
+ * 
+ * @param[in] portLib the port library
+ * @param[in] entry the zip entry we are freeing 
+ * 
+ * @return none 
+ * 
+ * @note This does not free the entry itself.
+*/
+
+void
+zip_freeZipEntry (HyPortLibrary * portLib, HyZipEntry * entry)
+{
+  PORT_ACCESS_FROM_PORT (portLib);
+
+  if ((entry->filename) && (entry->filename != entry->internalFilename))
+    {
+      hymem_free_memory (entry->filename);
+    }
+  entry->filename = NULL;
+  if (entry->extraField)
+    {
+      hymem_free_memory (entry->extraField);
+      entry->extraField = NULL;
+    }
+  if (entry->data)
+    {
+      hymem_free_memory (entry->data);
+      entry->data = NULL;
+    }
+  if (entry->fileComment)
+    {
+      hymem_free_memory (entry->fileComment);
+      entry->fileComment = NULL;
+    }
+}
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION zip_getNextZipEntry
+/**
+ *	Read the next zip entry at nextEntryPointer into zipEntry.
+ *	
+ * Any memory held onto by zipEntry may be lost, and therefore
+ *	MUST be freed with @ref zip_freeZipEntry first.
+ *
+ * @param[in] portLib the port library
+ * @param[in] zipFile The zip file being read
+ * @param[out] zipEntry compressed data is placed here
+ * @param[in] nextEntryPointer
+ * 
+ * @return 0 on success
+ * @return 	ZIP_ERR_FILE_READ_ERROR if there is an error reading zipFile
+ * @return ZIP_ERR_FILE_CORRUPT if zipFile is corrupt
+ * @return 	ZIP_ERR_NO_MORE_ENTRIES if there are no more entries in zipFile
+ * @return 	ZIP_ERR_OUT_OF_MEMORY if there is not enough memory to complete this call
+ *
+ * @see zip_freeZipEntry
+ *
+*/
+I_32
+zip_getNextZipEntry (HyPortLibrary * portLib, HyZipFile * zipFile,
+                     HyZipEntry * zipEntry, IDATA * nextEntryPointer)
+{
+  PORT_ACCESS_FROM_PORT (portLib);
+#if defined(HY_NO_THR)
+  THREAD_ACCESS_FROM_PORT(portLib);
+#endif /* HY_NO_THR */
+  IDATA result;
+  BOOLEAN retryAllowed = TRUE;
+  IDATA pointer;
+  IDATA entryStart;
+  I_64 seekResult;
+
+  ENTER ();
+
+retry:
+  pointer = *nextEntryPointer;
+
+  /* Seek to the entry's position in the file. */
+  if (pointer != zipFile->pointer)
+    {
+      seekResult = hyfile_seek (zipFile->fd, pointer, HySeekSet);
+      if ((seekResult < 0) || (seekResult > HYCONST64 (0x7FFFFFFF)))
+        {
+          zipFile->pointer = -1;
+          EXIT ();
+          return ZIP_ERR_FILE_READ_ERROR;
+        }
+      zipFile->pointer = (I_32) seekResult;
+
+      if (pointer != zipFile->pointer)
+        {
+          zipFile->pointer = -1;
+          EXIT ();
+          return ZIP_ERR_FILE_READ_ERROR;
+        }
+    }
+
+  /* Read the entry */
+  entryStart = *nextEntryPointer;
+  result =
+    readZipEntry (portLib, zipFile, zipEntry, NULL, &pointer, &entryStart,
+                  FALSE);
+  if (result != 0)
+    {
+      if (!retryAllowed || (result == ZIP_ERR_NO_MORE_ENTRIES))
+        {
+          EXIT ();
+          return result;
+        }
+      zip_establishCache (portLib, zipFile);
+      retryAllowed = FALSE;
+      goto retry;
+    }
+
+  if (zipFile->cache)
+    {
+      /* Validity check: look up filename in the cache... */
+      result =
+        (IDATA) zipCache_findElement (zipFile->cache,
+                                      (const char *) zipEntry->filename,
+                                      FALSE);
+      if (result != entryStart)
+        {
+#ifndef HY_ZIP_API
+          if (result >= zipFile->cache->startCentralDir)
+#else /* HY_ZIP_API */
+          if (result >= ((HyZipCache *)(zipFile->cache))->startCentralDir)
+#endif /* HY_ZIP_API */
+            {
+              /* ! Cache contents are not valid.  Invalidate it and make a new one */
+              if (!retryAllowed)
+                {
+                  EXIT ();
+                  return ZIP_ERR_FILE_CORRUPT;  /* should never happen! */
+                }
+              result = zip_establishCache (portLib, zipFile);
+              if (result)
+                {
+                  /* (silently start operating without a cache if we couldn't make a new one) */
+                }
+              else
+                {
+                  retryAllowed = FALSE;
+                  goto retry;
+                }
+            }
+          else
+            {
+              /* We know that the central header for this entry contains info that the
+                 local header is missing (comment length and/or uncompressed size) */
+              zipEntry->fileCommentPointer = -1;
+            }
+        }
+    }
+
+  *nextEntryPointer = pointer;
+  EXIT ();
+  return 0;
+}
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION zip_getZipEntry
+/**
+ *	Attempt to find and read the zip entry corresponding to filename.
+ *	If found, read the entry into the parameter entry. 
+ *
+ * If an uncached entry is found, the filename field will be filled in. This
+ * memory will have to be freed with @ref zip_freeZipEntry.
+ * 
+ * @param[in] portLib the port library
+ * @param[in] zipFile the file being read from
+ * @param[out] entry the zip entry found in zipFile is read to here
+ * @param[in] filename the name of the file that corresponds to entry
+ * @param[in] findDirectory when true, match a directory even if filename does not end in '/'.
+ *			Note findDirectory is only supported (for the JCL) when there is a cache
+ *
+ * @return 0 on success or one of the following:
+ * @return	ZIP_ERR_FILE_READ_ERROR if there is an error reading from zipFile
+ * @return	ZIP_ERR_FILE_CORRUPT if zipFile is corrupt
+ * @return	ZIP_ERR_ENTRY_NOT_FOUND if a zip entry with name filename was not found
+ * @return 	ZIP_ERR_OUT_OF_MEMORY if there is not enough memory to complete this call
+ *
+ * @see zip_freeZipEntry
+*/
+
+I_32
+zip_getZipEntry (HyPortLibrary * portLib, HyZipFile * zipFile,
+                 HyZipEntry * entry, const char *filename,
+                 BOOLEAN findDirectory)
+{
+  PORT_ACCESS_FROM_PORT (portLib);
+#if defined(HY_NO_THR)
+  THREAD_ACCESS_FROM_PORT(portLib);
+#endif /* HY_NO_THR */
+  IDATA result, position;
+  BOOLEAN retryAllowed = TRUE;
+  I_64 seekResult;
+
+  ENTER ();
+
+retry:
+  if (zipFile->cache)
+    {
+      /* Look up filename in the cache. */
+      position =
+        (IDATA) zipCache_findElement (zipFile->cache, filename,
+                                      findDirectory);
+      if (position == -1)
+        {
+          /* Note: we assume the cache is still valid here */
+          EXIT ();
+          return ZIP_ERR_ENTRY_NOT_FOUND;
+        }
+
+      /* Seek to the entry's position in the file. */
+      if (zipFile->pointer != position)
+        {
+          seekResult = hyfile_seek (zipFile->fd, position, HySeekSet);
+          if ((seekResult < 0) || (seekResult > HYCONST64 (0x7FFFFFFF)))
+            {
+              zipFile->pointer = -1;
+              EXIT ();
+              return ZIP_ERR_FILE_READ_ERROR;
+            }
+          zipFile->pointer = (I_32) seekResult;
+
+          if (zipFile->pointer != position)
+            {
+              zipFile->pointer = -1;
+              EXIT ();
+              return ZIP_ERR_FILE_READ_ERROR;
+            }
+        }
+
+      /* Read the entry */
+      result =
+        readZipEntry (portLib, zipFile, entry, filename, NULL, NULL,
+                      findDirectory);
+      if (result != 0)
+        {
+          if (!retryAllowed)
+            {
+              EXIT ();
+              return result;
+            }
+          result = zip_establishCache (portLib, zipFile);       /* invalidate existing cache */
+          if (result)
+            {
+              EXIT ();
+              return result;
+            }
+          retryAllowed = FALSE;
+          goto retry;
+        }
+      EXIT ();
+      return 0;
+    }
+  else
+    {
+      /* Uh oh -- random access without a cache (SLOW!) */
+      position = 0;
+      zip_resetZipFile (PORTLIB, zipFile, &position);
+      while (TRUE)
+        {
+
+          if (zipFile->pointer != position)
+            {
+              seekResult = hyfile_seek (zipFile->fd, position, HySeekSet);
+              if ((seekResult < 0) || (seekResult > HYCONST64 (0x7FFFFFFF)))
+                {
+                  zipFile->pointer = -1;
+                  EXIT ();
+                  return ZIP_ERR_FILE_READ_ERROR;
+                }
+              zipFile->pointer = (I_32) seekResult;
+
+              if (zipFile->pointer != position)
+                {
+                  zipFile->pointer = -1;
+                  EXIT ();
+                  return ZIP_ERR_FILE_READ_ERROR;
+                }
+            }
+
+          result =
+            readZipEntry (portLib, zipFile, entry, NULL, &position, NULL,
+                          FALSE);
+          if (result || !strcmp ((const char *) entry->filename, filename))
+            {
+              EXIT ();
+              return result;
+            }
+
+          /* No match.  Reset for next entry */
+          zip_freeZipEntry (portLib, entry);
+          zip_initZipEntry (portLib, entry);
+        }
+    }
+}
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION zip_getZipEntryData
+/** 
+ *	Attempt to read and uncompress the data for the zip entry entry.
+ * 
+ *	If buffer is non-NULL it is used, but not explicitly held onto by the entry.
+ *	If buffer is NULL, memory is allocated and held onto by the entry, and thus
+ *	should later be freed with @ref zip_freeZipEntry.
+ *
+ * @param[in] portLib the port library
+ * @param[in] zipFile the zip file being read from.
+ * @param[in,out] entry the zip entry
+ * @param[in] buffer may or may not be NULL
+ * @param[in] bufferSize
+
+ * @return 0 on success
+ * @return	ZIP_ERR_FILE_READ_ERROR if there is an error reading from zipEntry
+ * @return	ZIP_ERR_FILE_CORRUPT if zipFile is corrupt
+ * @return	ZIP_ERR_ENTRY_NOT_FOUND if entry is not found
+ * @return 	ZIP_ERR_OUT_OF_MEMORY  if there is not enough memory to complete this call
+ * @return 	ZIP_ERR_BUFFER_TOO_SMALL if buffer is too small to hold the comment for zipFile
+ *
+ * @see zip_freeZipEntry
+ *
+*/
+I_32
+zip_getZipEntryData (HyPortLibrary * portLib, HyZipFile * zipFile,
+                     HyZipEntry * entry, U_8 * buffer, U_32 bufferSize)
+{
+  PORT_ACCESS_FROM_PORT (portLib);
+#if defined(HY_NO_THR)
+  THREAD_ACCESS_FROM_PORT(portLib);
+#endif /* HY_NO_THR */
+
+  I_32 result;
+  U_8 *dataBuffer;
+  struct workBuffer wb;
+  I_64 seekResult;
+
+  ENTER ();
+
+  wb.portLib = portLib;
+  wb.bufferStart = wb.bufferEnd = wb.currentAlloc = 0;
+
+  if (buffer)
+    {
+      if (bufferSize < entry->uncompressedSize)
+        {
+          EXIT ();
+          return ZIP_ERR_BUFFER_TOO_SMALL;
+        }
+      dataBuffer = buffer;
+    }
+  else
+    {
+      /* Note that this is the first zalloc. This memory must be available to the calling method and is freed explicitly in zip_freeZipEntry. */
+      /* Note that other allocs freed in zip_freeZipEntry are not alloc'd using zalloc */
+      dataBuffer = zdataalloc (&wb, 1, entry->uncompressedSize);
+      if (!dataBuffer)
+        {
+          EXIT ();
+          return ZIP_ERR_OUT_OF_MEMORY;
+        }
+      entry->data = dataBuffer;
+    }
+
+  if (entry->compressionMethod == ZIP_CM_Stored)
+    {
+      /* No compression - just read the data in. */
+      if (zipFile->pointer != entry->dataPointer)
+        {
+          seekResult =
+            hyfile_seek (zipFile->fd, entry->dataPointer, HySeekSet);
+          if ((seekResult < 0) || (seekResult > HYCONST64 (0x7FFFFFFF)))
+            {
+              zipFile->pointer = -1;
+              result = ZIP_ERR_FILE_READ_ERROR;
+              goto finished;
+            }
+          zipFile->pointer = (I_32) seekResult;
+
+          if (zipFile->pointer != entry->dataPointer)
+            {
+              result = ZIP_ERR_FILE_READ_ERROR;
+              goto finished;
+            }
+        }
+      result = hyfile_read (zipFile->fd, dataBuffer, entry->compressedSize);
+      if (result != (I_32) entry->compressedSize)
+        {
+          result = ZIP_ERR_FILE_READ_ERROR;
+          goto finished;
+        }
+      zipFile->pointer += result;
+      EXIT ();
+      return 0;
+    }
+
+  if (entry->compressionMethod == ZIP_CM_Deflated)
+    {
+      U_8 *readBuffer;
+
+      /* Ensure that the library is loaded. */
+      if (checkZipLibrary (portLib))
+        {
+          result = ZIP_ERR_UNSUPPORTED_FILE_TYPE;
+          goto finished;
+        }
+
+      /* Read the file contents. */
+      readBuffer = zdataalloc (&wb, 1, entry->compressedSize);
+      if (!readBuffer)
+        {
+          result = ZIP_ERR_OUT_OF_MEMORY;
+          goto finished;
+        }
+      if (zipFile->pointer != entry->dataPointer)
+        {
+          seekResult =
+            hyfile_seek (zipFile->fd, entry->dataPointer, HySeekSet);
+          if ((seekResult < 0) || (seekResult > HYCONST64 (0x7FFFFFFF)))
+            {
+              zipFile->pointer = -1;
+              zdatafree (&wb, readBuffer);
+              result = ZIP_ERR_FILE_READ_ERROR;
+              goto finished;
+            }
+          zipFile->pointer = (I_32) seekResult;
+
+          if (zipFile->pointer != entry->dataPointer)
+            {
+              zdatafree (&wb, readBuffer);
+              result = ZIP_ERR_FILE_READ_ERROR;
+              goto finished;
+            }
+        }
+      if (hyfile_read (zipFile->fd, readBuffer, entry->compressedSize) !=
+          (I_32) entry->compressedSize)
+        {
+          zdatafree (&wb, readBuffer);
+          result = ZIP_ERR_FILE_READ_ERROR;
+          goto finished;
+        }
+      zipFile->pointer += (I_32) entry->compressedSize;
+
+      /* Deflate the data. */
+      result =
+        inflateData (&wb, readBuffer, entry->compressedSize, dataBuffer,
+                     entry->uncompressedSize);
+      zdatafree (&wb, readBuffer);
+      if (result)
+        goto finished;
+      EXIT ();
+      return 0;
+    }
+
+  /* Whatever this is, we can't decompress it */
+  result = ZIP_ERR_UNSUPPORTED_FILE_TYPE;
+
+finished:
+  if (!buffer)
+    {
+      entry->data = NULL;
+      zdatafree (&wb, dataBuffer);
+    }
+  if (result == ZIP_ERR_FILE_READ_ERROR)
+    {
+      zipFile->pointer = -1;
+    }
+  EXIT ();
+  return result;
+}
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION zip_getZipEntryExtraField
+/** 
+ *	Read the extra field of entry from the zip file filename. 
+ *
+ * buffer is used if non-NULL, but is not held onto by entry. 
+ *
+ * If buffer is NULL, memory is allocated and held onto by entry, and MUST be freed later with
+ *	@ref zip_freeZipEntry.
+ *
+ * @param[in] portLib the port library
+ * @param[in] zipFile the zip file being read from.
+ * @param[in,out] entry the zip entry concerned
+ * @param[in] buffer may or may not be NULL
+ * @param[in] bufferSize
+ *
+ * @return 0 on success or one of the following:
+ * @return ZIP_ERR_FILE_READ_ERROR if there is an error reading from zipFile
+ * @return 	ZIP_ERR_FILE_CORRUPT if zipFile is corrupt
+ * @return 	ZIP_ERR_OUT_OF_MEMORY if there is not enough memory to complete this call
+ * @return 	ZIP_ERR_BUFFER_TOO_SMALL if the buffer was non-Null but not large enough to hold the contents of entry
+ *
+ * @see zip_freeZipEntry
+*/
+I_32
+zip_getZipEntryExtraField (HyPortLibrary * portLib, HyZipFile * zipFile,
+                           HyZipEntry * entry, U_8 * buffer, U_32 bufferSize)
+{
+  PORT_ACCESS_FROM_PORT (portLib);
+#if defined(HY_NO_THR)
+  THREAD_ACCESS_FROM_PORT(portLib);
+#endif /* HY_NO_THR */
+
+  I_32 result;
+  U_8 *extraFieldBuffer;
+  I_64 seekResult;
+
+  ENTER ();
+
+  if (entry->extraFieldLength == 0)
+    {
+      EXIT ();
+      return 0;
+    }
+
+  if (buffer)
+    {
+      if (bufferSize < entry->extraFieldLength)
+        {
+          EXIT ();
+          return ZIP_ERR_BUFFER_TOO_SMALL;
+        }
+      extraFieldBuffer = buffer;
+    }
+  else
+    {
+      extraFieldBuffer = hymem_allocate_memory (entry->extraFieldLength);
+      if (!extraFieldBuffer)
+        {
+          EXIT ();
+          return ZIP_ERR_OUT_OF_MEMORY;
+        }
+      entry->extraField = extraFieldBuffer;
+    }
+
+  if (zipFile->pointer != entry->extraFieldPointer)
+    {
+      seekResult =
+        hyfile_seek (zipFile->fd, entry->extraFieldPointer, HySeekSet);
+      if ((seekResult < 0) || (seekResult > HYCONST64 (0x7FFFFFFF)))
+        {
+          zipFile->pointer = -1;
+          result = ZIP_ERR_FILE_READ_ERROR;
+          goto finished;
+        }
+      zipFile->pointer = (I_32) seekResult;
+      if (zipFile->pointer != entry->extraFieldPointer)
+        {
+          result = ZIP_ERR_FILE_READ_ERROR;
+          goto finished;
+        }
+    }
+  result =
+    hyfile_read (zipFile->fd, extraFieldBuffer, entry->extraFieldLength);
+  if (result != (I_32) entry->extraFieldLength)
+    {
+      result = ZIP_ERR_FILE_READ_ERROR;
+      goto finished;
+    }
+  zipFile->pointer += result;
+  EXIT ();
+  return 0;
+
+finished:
+  if (!buffer)
+    {
+      entry->extraField = NULL;
+      hymem_free_memory (extraFieldBuffer);
+    }
+  if (result == ZIP_ERR_FILE_READ_ERROR)
+    zipFile->pointer = -1;
+  EXIT ();
+  return result;
+
+}
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION zip_getZipEntryFilename
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION zip_getZipEntryComment
+/**
+ *	Read the file comment for entry. 
+ *
+ * If buffer is non-NULL, it is used, but not held onto by entry. 
+ *
+ * If buffer is NULL, memory is allocated and
+ *	held onto by entry, and thus should later be freed with @ref zip_freeZipEntry.
+ *
+ * @param[in] portLib the port library
+ * @param[in] zipFile the zip file concerned
+ * @param[in] entry the entry who's comment we want
+ * @param[in] buffer may or may not be NULL
+ * @param[in] bufferSize
+
+ * @return 0 on success or one of the following
+ * @return	ZIP_ERR_FILE_READ_ERROR if there is an error reading the file comment from zipEntry
+ * @return	ZIP_ERR_FILE_CORRUPT if zipFile is corrupt
+ * @return	ZIP_ERR_ENTRY_NOT_FOUND if entry is not found
+ * @return 	ZIP_ERR_OUT_OF_MEMORY  if there is not enough memory to complete this call
+ * @return 	ZIP_ERR_BUFFER_TOO_SMALL if buffer is too small to hold the comment for zipFile
+*/
+
+I_32
+zip_getZipEntryComment (HyPortLibrary * portLib, HyZipFile * zipFile,
+                        HyZipEntry * entry, U_8 * buffer, U_32 bufferSize)
+{
+  PORT_ACCESS_FROM_PORT (portLib);
+#if defined(HY_NO_THR)
+  THREAD_ACCESS_FROM_PORT(portLib);
+#endif /* HY_NO_THR */
+
+  I_32 result;
+  U_8 *fileCommentBuffer;
+  I_64 seekResult;
+
+  ENTER ();
+
+  if (entry->fileCommentLength == 0)
+    {
+      if (entry->fileCommentPointer == -1)
+        {
+          /* TODO: we don't know where the comment is (or even if there is one)! This only happens if you're running
+             without a cache, so too bad for now */
+        }
+      EXIT ();
+      return 0;
+    }
+
+  if (buffer)
+    {
+      if (bufferSize < entry->fileCommentLength)
+        {
+          EXIT ();
+          return ZIP_ERR_BUFFER_TOO_SMALL;
+        }
+      fileCommentBuffer = buffer;
+    }
+  else
+    {
+      fileCommentBuffer = hymem_allocate_memory (entry->fileCommentLength);
+      if (!fileCommentBuffer)
+        {
+          EXIT ();
+          return ZIP_ERR_OUT_OF_MEMORY;
+        }
+      entry->fileComment = fileCommentBuffer;
+    }
+
+  if (zipFile->pointer != entry->fileCommentPointer)
+    {
+      seekResult =
+        hyfile_seek (zipFile->fd, entry->fileCommentPointer, HySeekSet);
+      if ((seekResult < 0) || (seekResult > HYCONST64 (0x7FFFFFFF)))
+        {
+          zipFile->pointer = -1;
+          result = ZIP_ERR_FILE_READ_ERROR;
+          goto finished;
+        }
+      zipFile->pointer = (I_32) seekResult;
+
+      if (zipFile->pointer != entry->fileCommentPointer)
+        {
+          result = ZIP_ERR_FILE_READ_ERROR;
+          goto finished;
+        }
+    }
+  result =
+    hyfile_read (zipFile->fd, fileCommentBuffer, entry->fileCommentLength);
+  if (result != (I_32) entry->fileCommentLength)
+    {
+      result = ZIP_ERR_FILE_READ_ERROR;
+      goto finished;
+    }
+  zipFile->pointer += result;
+  EXIT ();
+  return 0;
+
+finished:
+  if (!buffer)
+    {
+      entry->fileComment = NULL;
+      hymem_free_memory (fileCommentBuffer);
+    }
+  if (result == ZIP_ERR_FILE_READ_ERROR)
+    {
+      zipFile->pointer = -1;
+    }
+  EXIT ();
+  return result;
+
+}
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION zip_openZipFile
+/**
+ * Attempt to open a zip file. 
+ * 
+ * If the cache pool is non-NULL, the cachePool will be used to find a suitable cache, and if none can be found it will create one and add it to cachePool.
+ * Zip support is responsible for managing the lifetime of the cache.  
+ *
+ * @note If cachePool is NULL, zipFile will be opened without a cache.
+ *
+ * @param[in] portLib the port library
+ * @param[in] filename the zip file to open
+ * @param[out] zipFile the zip file structure to populate
+ * @param[in] cachePool the cache pool
+ * 
+ * @return 0 on success
+ * @return 	ZIP_ERR_FILE_OPEN_ERROR if is there is an error opening the file
+ * @return	ZIP_ERR_FILE_READ_ERROR if there is an error reading the file
+ * @return	ZIP_ERR_FILE_CORRUPT if the file is corrupt
+ * @return	ZIP_ERR_UNKNOWN_FILE_TYPE if the file type is not known
+ * @return	ZIP_ERR_UNSUPPORTED_FILE_TYPE if the file type is unsupported
+ * @return	ZIP_ERR_OUT_OF_MEMORY if we are out of memory
+*/
+I_32
+zip_openZipFile (HyPortLibrary * portLib, char *filename, HyZipFile * zipFile,
+                 HyZipCachePool * cachePool)
+{
+  PORT_ACCESS_FROM_PORT (portLib);
+#if defined(HY_NO_THR)
+  THREAD_ACCESS_FROM_PORT(portLib);
+#endif /* HY_NO_THR */
+
+  IDATA fd = -1;
+  I_32 result = 0;
+  I_64 seekResult;
+  U_8 buffer[4];
+  I_32 len;
+
+  ENTER ();
+
+  len = strlen (filename);
+  zipFile->fd = -1;
+  zipFile->type = ZIP_Unknown;
+  zipFile->cache = NULL;
+  zipFile->cachePool = NULL;
+  zipFile->pointer = -1;
+  /* Allocate space for filename */
+  if (len >= ZIP_INTERNAL_MAX)
+    {
+      zipFile->filename = hymem_allocate_memory (len + 1);
+      if (!zipFile->filename)
+        {
+          EXIT ();
+          return ZIP_ERR_OUT_OF_MEMORY;
+        }
+    }
+  else
+    {
+      zipFile->filename = zipFile->internalFilename;
+    }
+
+  strcpy ((char *) zipFile->filename, filename);
+
+  fd = hyfile_open (filename, HyOpenRead, 0);
+  if (fd == -1)
+    {
+      result = ZIP_ERR_FILE_OPEN_ERROR;
+      goto finished;
+    }
+
+  if (hyfile_read (fd, buffer, 4) != 4)
+    {
+      result = ZIP_ERR_FILE_READ_ERROR;
+      goto finished;
+    }
+
+  if ((buffer[0] == 'P') && (buffer[1] == 'K'))
+    {
+      /* If not the central header or local file header, its corrupt */
+      if (!
+          ((buffer[2] == 1 && buffer[3] == 2)
+           || (buffer[2] == 3 && buffer[3] == 4)))
+        {
+          result = ZIP_ERR_FILE_CORRUPT;
+          goto finished;
+        }
+      /* PKZIP file. Back up the pointer to the beginning. */
+      seekResult = hyfile_seek (fd, 0, HySeekSet);
+      if (seekResult != 0)
+        {
+          result = ZIP_ERR_FILE_READ_ERROR;
+          goto finished;
+        }
+
+      zipFile->fd = fd;
+      zipFile->type = ZIP_PKZIP;
+      zipFile->pointer = 0;
+    }
+
+  if ((buffer[0] == 0x1F) && (buffer[1] == 0x8B))
+    {
+      /* GZIP - currently unsupported. 
+         zipFile->fd = fd;
+         zipFile->type = ZIP_GZIP;
+         zipFile->pointer = 2;
+       */
+      result = ZIP_ERR_UNSUPPORTED_FILE_TYPE;
+      goto finished;
+    }
+
+  if (zipFile->type == ZIP_Unknown)
+    {
+      result = ZIP_ERR_UNKNOWN_FILE_TYPE;
+      goto finished;
+    }
+
+  result = 0;
+
+  if (cachePool)
+    {
+      zipFile->cachePool = cachePool;
+      result = zip_establishCache (portLib, zipFile);
+    }
+
+finished:
+  if (result == 0)
+    {
+      zipFile->fd = fd;
+      EXIT ();
+      return 0;
+    }
+  if (fd != -1)
+    {
+      hyfile_close (fd);
+    }
+  if ((zipFile->filename) && (zipFile->filename != zipFile->internalFilename))
+    {
+      hymem_free_memory (zipFile->filename);
+    }
+  zipFile->filename = NULL;
+  EXIT ();
+  return result;
+}
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION zip_resetZipFile
+/**
+ * Reset nextEntryPointer to the first entry in the file.
+ *
+ * @param[in] portLib the port library
+ * @param[in] zipFile the zip being read from
+ * @param[out] nextEntryPointer will be reset to the first entry in the file
+ *
+ * @return none
+ *
+ * 
+*/
+void
+zip_resetZipFile (HyPortLibrary * portLib, HyZipFile * zipFile,
+                  IDATA * nextEntryPointer)
+{
+  *nextEntryPointer = 0;
+  if (zipFile)
+    {
+      if (zipFile->cache)
+#ifndef HY_ZIP_API
+        *nextEntryPointer = zipFile->cache->startCentralDir;
+#else /* HY_ZIP_API */
+        *nextEntryPointer = ((HyZipCache *)(zipFile->cache))->startCentralDir;
+#endif /* HY_ZIP_API */
+      else
+        {
+          I_32 result;
+          HyZipCentralEnd endEntry;
+          result = scanForCentralEnd (portLib, zipFile, &endEntry);
+          if (result != 0)
+            return;
+          *nextEntryPointer = (IDATA) ((UDATA) endEntry.dirOffset);
+        }
+    }
+}
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION zip_getZipEntryFromOffset
+/**
+ * Attempt to read a zip entry at offset from the zip file provided.
+ *	If found, read into entry.
+ *
+ * @note If an uncached entry is found, the filename field will be filled in. This
+ *	memory MUST be freed with @ref zip_freeZipEntry.
+ *
+ * @param[in] portLib the port library
+ * @param[in] zipFile the zip file being read
+ * @param[in] offset the offset into the zipFile of the desired zip entry
+ * @param[out] entry the compressed data
+ *
+ * @return 0 on success
+ * @return ZIP_ERR_FILE_READ_ERROR if there is an error reading from @ref zipFile
+ * @return 	ZIP_ERR_FILE_CORRUPT if @ref zipFile is corrupt
+ * @return 	ZIP_ERR_ENTRY_NOT_FOUND if the entry is not found 
+ * @return 	ZIP_ERR_OUT_OF_MEMORY if there is not enough memory to complete this call
+ *
+ * @see zip_freeZipEntry
+*/
+I_32
+zip_getZipEntryFromOffset (HyPortLibrary * portLib, HyZipFile * zipFile,
+                           HyZipEntry * entry, IDATA offset)
+{
+  PORT_ACCESS_FROM_PORT (portLib);
+#if defined(HY_NO_THR)
+  THREAD_ACCESS_FROM_PORT(portLib);
+#endif /* HY_NO_THR */
+  I_32 result;
+  I_64 seekResult;
+
+  ENTER ();
+
+  if (zipFile->pointer != offset)
+    {
+      seekResult = hyfile_seek (zipFile->fd, offset, HySeekSet);
+      if ((seekResult < 0) || (seekResult > HYCONST64 (0x7FFFFFFF)))
+        {
+          zipFile->pointer = -1;
+          EXIT ();
+          return ZIP_ERR_FILE_READ_ERROR;
+        }
+      zipFile->pointer = (I_32) seekResult;
+      if (zipFile->pointer != offset)
+        {
+          zipFile->pointer = -1;
+          EXIT ();
+          return ZIP_ERR_FILE_READ_ERROR;
+        }
+    }
+
+  result = readZipEntry (portLib, zipFile, entry, NULL, NULL, NULL, FALSE);
+  EXIT ();
+  return result;
+}
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION zdataalloc
+/*
+	cached alloc management for zip_getZipEntryData.
+*/
+void *
+zdataalloc (void *opaque, U_32 items, U_32 size)
+{
+  UDATA *returnVal = 0;
+  U_32 byteSize = items * size;
+  U_32 allocSize = WORK_BUFFER_SIZE;
+  struct workBuffer *wb = (struct workBuffer *) opaque;
+
+  PORT_ACCESS_FROM_PORT (wb->portLib);
+
+  /* Round to UDATA multiple */
+  byteSize = (byteSize + (sizeof (UDATA) - 1)) & ~(sizeof (UDATA) - 1);
+
+  if (wb->bufferStart == 0)
+    {
+      if (byteSize > WORK_BUFFER_SIZE)
+        {
+          allocSize = byteSize;
+        }
+      wb->bufferStart = hymem_allocate_memory (allocSize);
+      if (wb->bufferStart)
+        {
+          wb->bufferEnd = (UDATA *) ((UDATA) wb->bufferStart + allocSize);
+          wb->currentAlloc = wb->bufferStart;
+          wb->cntr = 0;
+        }
+    }
+
+  if ((wb->bufferStart == 0)
+      || (((UDATA) wb->currentAlloc + byteSize) > (UDATA) wb->bufferEnd))
+    {
+      returnVal = hymem_allocate_memory (byteSize);
+    }
+  else
+    {
+      ++(wb->cntr);
+      returnVal = wb->currentAlloc;
+      wb->currentAlloc = (UDATA *) ((UDATA) wb->currentAlloc + byteSize);
+    }
+  return returnVal;
+}
+
+#undef CDEV_CURRENT_FUNCTION
+
+#define CDEV_CURRENT_FUNCTION zdatafree
+/*
+	cached alloc management for zip_getZipEntryData.
+*/
+void
+zdatafree (void *opaque, void *address)
+{
+  struct workBuffer *wb = (struct workBuffer *) opaque;
+
+  PORT_ACCESS_FROM_PORT (wb->portLib);
+
+  if ((address < (void *) wb->bufferStart)
+      || (address >= (void *) wb->bufferEnd))
+    {
+      hymem_free_memory (address);
+    }
+  else if (--(wb->cntr) == 0)
+    {
+      hymem_free_memory (wb->bufferStart);
+      wb->bufferStart = wb->bufferEnd = wb->currentAlloc = 0;
+    }
+
+}
+
+#undef CDEV_CURRENT_FUNCTION

Propchange: harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/shared/zipsup.c
------------------------------------------------------------------------------
    svn:eol-style = native

Added: harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/shared/zipsup.h
URL: http://svn.apache.org/viewvc/harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/shared/zipsup.h?view=auto&rev=539793
==============================================================================
--- harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/shared/zipsup.h (added)
+++ harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/shared/zipsup.h Sat May 19 12:22:00 2007
@@ -0,0 +1,137 @@
+/* 
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+* Zip Support Header
+*/
+
+#if !defined(ZIPSUP_H)
+#define ZIPSUP_H
+#if defined(__cplusplus)
+extern "C"
+{
+#endif
+#include "hyport.h"
+#include "hyzip.h"
+
+#define HY_ZIP_DLL_NAME "hyzlib"
+
+  typedef struct HyZipCache
+  {
+    U_8 *zipFileName;
+    IDATA zipFileSize;
+    I_64 zipTimeStamp;
+    IDATA startCentralDir;
+    struct HyPortLibrary *portLib;
+    void *cachePool;
+    void *cachePoolEntry;
+  } HyZipCache;
+
+
+  typedef struct HyZipCentralEnd
+  {
+    U_16 diskNumber;
+    U_16 dirStartDisk;
+    U_16 thisDiskEntries;
+    U_16 totalEntries;
+    U_32 dirSize;
+    U_32 dirOffset;
+    U_16 commentLength;
+    char _hypadding0012[2];   /* 2 bytes of automatic padding */
+    U_8 *comment;
+  } HyZipCentralEnd;
+
+
+  typedef struct HyZipDataDescriptor
+  {
+    U_32 crc32;
+    U_32 compressedSize;
+    U_32 uncompressedSize;
+  } HyZipDataDescriptor;
+
+
+/* HySourceZipSupport*/
+  extern HY_CFUNC I_32 zip_getZipEntryData
+    PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile,
+                HyZipEntry * entry, U_8 * buffer, U_32 bufferSize));
+  extern HY_CFUNC I_32 zip_getZipEntryFromOffset
+    PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile,
+                HyZipEntry * entry, IDATA offset));
+  extern HY_CFUNC I_32 zip_establishCache
+    PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile));
+  extern HY_CFUNC void zip_resetZipFile
+    PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile,
+                IDATA * nextEntryPointer));
+  extern HY_CFUNC I_32 zip_getNextZipEntry
+    PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile,
+                HyZipEntry * zipEntry, IDATA * nextEntryPointer));
+  extern HY_CFUNC I_32 zip_getZipEntry
+    PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile,
+                HyZipEntry * entry, const char *filename,
+                BOOLEAN findDirectory));
+  extern HY_CFUNC I_32 zip_getZipEntryExtraField
+    PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile,
+                HyZipEntry * entry, U_8 * buffer, U_32 bufferSize));
+  extern HY_CFUNC void zip_initZipEntry
+    PROTOTYPE ((HyPortLibrary * portLib, HyZipEntry * entry));
+  extern HY_CFUNC I_32 zip_openZipFile
+    PROTOTYPE ((HyPortLibrary * portLib, char *filename, HyZipFile * zipFile,
+                HyZipCachePool * cachePool));
+  extern HY_CFUNC void zip_freeZipEntry
+    PROTOTYPE ((HyPortLibrary * portLib, HyZipEntry * entry));
+  struct HyZipFile;
+  extern HY_CFUNC I_32 VMCALL zip_closeZipFile
+    PROTOTYPE ((HyPortLibrary * portLib, struct HyZipFile * zipFile));
+  extern HY_CFUNC I_32 zip_getZipEntryComment
+    PROTOTYPE ((HyPortLibrary * portLib, HyZipFile * zipFile,
+                HyZipEntry * entry, U_8 * buffer, U_32 bufferSize));
+/* HySourceZipCache*/
+  extern HY_CFUNC UDATA zipCache_findElement
+    PROTOTYPE ((HyZipCache * zipCache, const char *elementName,
+                BOOLEAN searchDirList));
+  extern HY_CFUNC void zipCache_kill PROTOTYPE ((HyZipCache * zipCache));
+  extern HY_CFUNC IDATA zipCache_enumGetDirName
+    PROTOTYPE ((void *handle, char *nameBuf, UDATA nameBufSize));
+  extern HY_CFUNC HyZipCache *zipCache_new
+    PROTOTYPE ((HyPortLibrary * portLib, char *zipName, IDATA zipNameLength));
+  extern HY_CFUNC IDATA zipCache_enumNew
+    PROTOTYPE ((HyZipCache * zipCache, char *directoryName, void **handle));
+  extern HY_CFUNC IDATA zipCache_enumElement
+    PROTOTYPE ((void *handle, char *nameBuf, UDATA nameBufSize,
+                UDATA * offset));
+  extern HY_CFUNC void zipCache_enumKill PROTOTYPE ((void *handle));
+  extern HY_CFUNC BOOLEAN zipCache_addElement
+    PROTOTYPE ((HyZipCache * zipCache, char *elementName,
+                UDATA elementOffset));
+/* HySourceZipCachePool*/
+  extern HY_CFUNC BOOLEAN zipCachePool_release
+    PROTOTYPE ((HyZipCachePool * zcp, HyZipCache * zipCache));
+  extern HY_CFUNC void zipCachePool_kill PROTOTYPE ((HyZipCachePool * zcp));
+  extern HY_CFUNC HyZipCache *zipCachePool_findCache
+    PROTOTYPE ((HyZipCachePool * zcp, char const *zipFileName,
+                IDATA zipFileNameLength, IDATA zipFileSize,
+                I_64 zipTimeStamp));
+  extern HY_CFUNC HyZipCachePool *zipCachePool_new
+    PROTOTYPE ((HyPortLibrary * portLib));
+  extern HY_CFUNC BOOLEAN zipCachePool_addCache
+    PROTOTYPE ((HyZipCachePool * zcp, HyZipCache * zipCache));
+  extern HY_CFUNC BOOLEAN zipCachePool_addRef
+    PROTOTYPE ((HyZipCachePool * zcp, HyZipCache * zipCache));
+#if defined(__cplusplus)
+}
+#endif
+#endif /* ZIPSUP_H */

Propchange: harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/shared/zipsup.h
------------------------------------------------------------------------------
    svn:eol-style = native

Added: harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/unix/DoxygenSupport.txt
URL: http://svn.apache.org/viewvc/harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/unix/DoxygenSupport.txt?view=auto&rev=539793
==============================================================================
--- harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/unix/DoxygenSupport.txt (added)
+++ harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/unix/DoxygenSupport.txt Sat May 19 12:22:00 2007
@@ -0,0 +1,28 @@
+/* 
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * This file provides the group definitions required to create the Doxygen generated
+ * output for compounds.  There is one group per directory (port, pool, thread, etc.).
+ */
+ 
+/**
+ * @defgroup ZipSupport Zip Support
+ * @brief Zip file  support for the Java VM.
+ */
+
+

Propchange: harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/unix/DoxygenSupport.txt
------------------------------------------------------------------------------
    svn:eol-style = native

Added: harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/unix/makefile
URL: http://svn.apache.org/viewvc/harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/unix/makefile?view=auto&rev=539793
==============================================================================
--- harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/unix/makefile (added)
+++ harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/unix/makefile Sat May 19 12:22:00 2007
@@ -0,0 +1,27 @@
+#  Licensed to the Apache Software Foundation (ASF) under one or more
+#  contributor license agreements.  See the NOTICE file distributed with
+#  this work for additional information regarding copyright ownership.
+#  The ASF licenses this file to You under the Apache License, Version 2.0
+#  (the "License"); you may not use this file except in compliance with
+#  the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+#
+# Makefile for module 'hyzip'
+#
+
+include $(HY_HDK)/build/make/defines.mk
+
+INCLUDES += -I../../include/shared
+BUILDFILES = $(SHAREDSUB)hyzip.o $(SHAREDSUB)zcpool.o $(SHAREDSUB)zipalloc.o \
+	$(SHAREDSUB)zipcache.o $(SHAREDSUB)zipsup.o
+LIBNAME = $(LIBPATH)libhyzip.a
+
+include $(HY_HDK)/build/make/rules.mk

Added: harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/windows/DoxygenSupport.txt
URL: http://svn.apache.org/viewvc/harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/windows/DoxygenSupport.txt?view=auto&rev=539793
==============================================================================
--- harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/windows/DoxygenSupport.txt (added)
+++ harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/windows/DoxygenSupport.txt Sat May 19 12:22:00 2007
@@ -0,0 +1,28 @@
+/* 
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * This file provides the group definitions required to create the Doxygen generated
+ * output for compounds.  There is one group per directory (port, pool, thread, etc.).
+ */
+ 
+/**
+ * @defgroup ZipSupport Zip Support
+ * @brief Zip file  support for the Java VM.
+ */
+
+

Propchange: harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/windows/DoxygenSupport.txt
------------------------------------------------------------------------------
    svn:eol-style = native

Added: harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/windows/makefile
URL: http://svn.apache.org/viewvc/harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/windows/makefile?view=auto&rev=539793
==============================================================================
--- harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/windows/makefile (added)
+++ harmony/enhanced/classlib/trunk/modules/luni/src/main/native/hyzip/windows/makefile Sat May 19 12:22:00 2007
@@ -0,0 +1,30 @@
+#  Licensed to the Apache Software Foundation (ASF) under one or more
+#  contributor license agreements.  See the NOTICE file distributed with
+#  this work for additional information regarding copyright ownership.
+#  The ASF licenses this file to You under the Apache License, Version 2.0
+#  (the "License"); you may not use this file except in compliance with
+#  the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+#
+# Makefile for module 'hyzip'
+#
+
+!include <$(HY_HDK)\build\make\defines.mak>
+
+LIBNAME=$(LIBPATH)hyzip.lib
+
+BUILDFILES = \
+	$(SHAREDSUB)hyzip.obj $(SHAREDSUB)zcpool.obj $(SHAREDSUB)zipalloc.obj \
+	$(SHAREDSUB)zipcache.obj $(SHAREDSUB)zipsup.obj
+
+HYCFLAGS = $(HYCFLAGS) /I$(SHAREDSUB) /I..\..\include\shared /I..\..\include\windows
+
+!include <$(HY_HDK)\build\make\rules.mak>



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