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From phroc...@apache.org
Subject [10/51] [partial] nifi-minifi-cpp git commit: MINIFICPP-72: Add Tar and Zip Support for MergeContent
Date Fri, 20 Oct 2017 17:18:21 GMT
http://git-wip-us.apache.org/repos/asf/nifi-minifi-cpp/blob/3781b52f/thirdparty/libarchive-3.3.2/libarchive/archive_read_support_format_warc.c
----------------------------------------------------------------------
diff --git a/thirdparty/libarchive-3.3.2/libarchive/archive_read_support_format_warc.c b/thirdparty/libarchive-3.3.2/libarchive/archive_read_support_format_warc.c
new file mode 100644
index 0000000..e875385
--- /dev/null
+++ b/thirdparty/libarchive-3.3.2/libarchive/archive_read_support_format_warc.c
@@ -0,0 +1,825 @@
+/*-
+ * Copyright (c) 2014 Sebastian Freundt
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "archive_platform.h"
+__FBSDID("$FreeBSD$");
+
+/**
+ * WARC is standardised by ISO TC46/SC4/WG12 and currently available as
+ * ISO 28500:2009.
+ * For the purposes of this file we used the final draft from:
+ * http://bibnum.bnf.fr/warc/WARC_ISO_28500_version1_latestdraft.pdf
+ *
+ * Todo:
+ * [ ] real-world warcs can contain resources at endpoints ending in /
+ *     e.g. http://bibnum.bnf.fr/warc/
+ *     if you're lucky their response contains a Content-Location: header
+ *     pointing to a unix-compliant filename, in the example above it's
+ *     Content-Location: http://bibnum.bnf.fr/warc/index.html
+ *     however, that's not mandated and github for example doesn't follow
+ *     this convention.
+ *     We need a set of archive options to control what to do with
+ *     entries like these, at the moment care is taken to skip them.
+ *
+ **/
+
+#ifdef HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+#ifdef HAVE_LIMITS_H
+#include <limits.h>
+#endif
+#ifdef HAVE_CTYPE_H
+#include <ctype.h>
+#endif
+#ifdef HAVE_TIME_H
+#include <time.h>
+#endif
+
+#include "archive.h"
+#include "archive_entry.h"
+#include "archive_private.h"
+#include "archive_read_private.h"
+
+typedef enum {
+	WT_NONE,
+	/* warcinfo */
+	WT_INFO,
+	/* metadata */
+	WT_META,
+	/* resource */
+	WT_RSRC,
+	/* request, unsupported */
+	WT_REQ,
+	/* response, unsupported */
+	WT_RSP,
+	/* revisit, unsupported */
+	WT_RVIS,
+	/* conversion, unsupported */
+	WT_CONV,
+	/* continuation, unsupported at the moment */
+	WT_CONT,
+	/* invalid type */
+	LAST_WT
+} warc_type_t;
+
+typedef struct {
+	size_t len;
+	const char *str;
+} warc_string_t;
+
+typedef struct {
+	size_t len;
+	char *str;
+} warc_strbuf_t;
+
+struct warc_s {
+	/* content length ahead */
+	size_t cntlen;
+	/* and how much we've processed so far */
+	size_t cntoff;
+	/* and how much we need to consume between calls */
+	size_t unconsumed;
+
+	/* string pool */
+	warc_strbuf_t pool;
+	/* previous version */
+	unsigned int pver;
+	/* stringified format name */
+	struct archive_string sver;
+};
+
+static int _warc_bid(struct archive_read *a, int);
+static int _warc_cleanup(struct archive_read *a);
+static int _warc_read(struct archive_read*, const void**, size_t*, int64_t*);
+static int _warc_skip(struct archive_read *a);
+static int _warc_rdhdr(struct archive_read *a, struct archive_entry *e);
+
+/* private routines */
+static unsigned int _warc_rdver(const char buf[10], size_t bsz);
+static unsigned int _warc_rdtyp(const char *buf, size_t bsz);
+static warc_string_t _warc_rduri(const char *buf, size_t bsz);
+static ssize_t _warc_rdlen(const char *buf, size_t bsz);
+static time_t _warc_rdrtm(const char *buf, size_t bsz);
+static time_t _warc_rdmtm(const char *buf, size_t bsz);
+static const char *_warc_find_eoh(const char *buf, size_t bsz);
+static const char *_warc_find_eol(const char *buf, size_t bsz);
+
+int
+archive_read_support_format_warc(struct archive *_a)
+{
+	struct archive_read *a = (struct archive_read *)_a;
+	struct warc_s *w;
+	int r;
+
+	archive_check_magic(_a, ARCHIVE_READ_MAGIC,
+	    ARCHIVE_STATE_NEW, "archive_read_support_format_warc");
+
+	if ((w = calloc(1, sizeof(*w))) == NULL) {
+		archive_set_error(&a->archive, ENOMEM,
+		    "Can't allocate warc data");
+		return (ARCHIVE_FATAL);
+	}
+
+	r = __archive_read_register_format(
+		a, w, "warc",
+		_warc_bid, NULL, _warc_rdhdr, _warc_read,
+		_warc_skip, NULL, _warc_cleanup, NULL, NULL);
+
+	if (r != ARCHIVE_OK) {
+		free(w);
+		return (r);
+	}
+	return (ARCHIVE_OK);
+}
+
+static int
+_warc_cleanup(struct archive_read *a)
+{
+	struct warc_s *w = a->format->data;
+
+	if (w->pool.len > 0U) {
+		free(w->pool.str);
+	}
+	archive_string_free(&w->sver);
+	free(w);
+	a->format->data = NULL;
+	return (ARCHIVE_OK);
+}
+
+static int
+_warc_bid(struct archive_read *a, int best_bid)
+{
+	const char *hdr;
+	ssize_t nrd;
+	unsigned int ver;
+
+	(void)best_bid; /* UNUSED */
+
+	/* check first line of file, it should be a record already */
+	if ((hdr = __archive_read_ahead(a, 12U, &nrd)) == NULL) {
+		/* no idea what to do */
+		return -1;
+	} else if (nrd < 12) {
+		/* nah, not for us, our magic cookie is at least 12 bytes */
+		return -1;
+	}
+
+	/* otherwise snarf the record's version number */
+	ver = _warc_rdver(hdr, nrd);
+	if (ver < 1200U || ver > 10000U) {
+		/* we only support WARC 0.12 to 1.0 */
+		return -1;
+	}
+
+	/* otherwise be confident */
+	return (64);
+}
+
+static int
+_warc_rdhdr(struct archive_read *a, struct archive_entry *entry)
+{
+#define HDR_PROBE_LEN		(12U)
+	struct warc_s *w = a->format->data;
+	unsigned int ver;
+	const char *buf;
+	ssize_t nrd;
+	const char *eoh;
+	/* for the file name, saves some strndup()'ing */
+	warc_string_t fnam;
+	/* warc record type, not that we really use it a lot */
+	warc_type_t ftyp;
+	/* content-length+error monad */
+	ssize_t cntlen;
+	/* record time is the WARC-Date time we reinterpret it as ctime */
+	time_t rtime;
+	/* mtime is the Last-Modified time which will be the entry's mtime */
+	time_t mtime;
+
+start_over:
+	/* just use read_ahead() they keep track of unconsumed
+	 * bits and bobs for us; no need to put an extra shift in
+	 * and reproduce that functionality here */
+	buf = __archive_read_ahead(a, HDR_PROBE_LEN, &nrd);
+
+	if (nrd < 0) {
+		/* no good */
+		archive_set_error(
+			&a->archive, ARCHIVE_ERRNO_MISC,
+			"Bad record header");
+		return (ARCHIVE_FATAL);
+	} else if (buf == NULL) {
+		/* there should be room for at least WARC/bla\r\n
+		 * must be EOF therefore */
+		return (ARCHIVE_EOF);
+	}
+ 	/* looks good so far, try and find the end of the header now */
+	eoh = _warc_find_eoh(buf, nrd);
+	if (eoh == NULL) {
+		/* still no good, the header end might be beyond the
+		 * probe we've requested, but then again who'd cram
+		 * so much stuff into the header *and* be 28500-compliant */
+		archive_set_error(
+			&a->archive, ARCHIVE_ERRNO_MISC,
+			"Bad record header");
+		return (ARCHIVE_FATAL);
+	}
+	ver = _warc_rdver(buf, eoh - buf);
+	/* we currently support WARC 0.12 to 1.0 */
+	if (ver == 0U) {
+		archive_set_error(
+			&a->archive, ARCHIVE_ERRNO_MISC,
+			"Invalid record version");
+		return (ARCHIVE_FATAL);
+	} else if (ver < 1200U || ver > 10000U) {
+		archive_set_error(
+			&a->archive, ARCHIVE_ERRNO_MISC,
+			"Unsupported record version: %u.%u",
+			ver / 10000, (ver % 10000) / 100);
+		return (ARCHIVE_FATAL);
+	}
+	cntlen = _warc_rdlen(buf, eoh - buf);
+	if (cntlen < 0) {
+		/* nightmare!  the specs say content-length is mandatory
+		 * so I don't feel overly bad stopping the reader here */
+		archive_set_error(
+			&a->archive, EINVAL,
+			"Bad content length");
+		return (ARCHIVE_FATAL);
+	}
+	rtime = _warc_rdrtm(buf, eoh - buf);
+	if (rtime == (time_t)-1) {
+		/* record time is mandatory as per WARC/1.0,
+		 * so just barf here, fast and loud */
+		archive_set_error(
+			&a->archive, EINVAL,
+			"Bad record time");
+		return (ARCHIVE_FATAL);
+	}
+
+	/* let the world know we're a WARC archive */
+	a->archive.archive_format = ARCHIVE_FORMAT_WARC;
+	if (ver != w->pver) {
+		/* stringify this entry's version */
+		archive_string_sprintf(&w->sver,
+			"WARC/%u.%u", ver / 10000, (ver % 10000) / 100);
+		/* remember the version */
+		w->pver = ver;
+	}
+	/* start off with the type */
+	ftyp = _warc_rdtyp(buf, eoh - buf);
+	/* and let future calls know about the content */
+	w->cntlen = cntlen;
+	w->cntoff = 0U;
+	mtime = 0;/* Avoid compiling error on some platform. */
+
+	switch (ftyp) {
+	case WT_RSRC:
+	case WT_RSP:
+		/* only try and read the filename in the cases that are
+		 * guaranteed to have one */
+		fnam = _warc_rduri(buf, eoh - buf);
+		/* check the last character in the URI to avoid creating
+		 * directory endpoints as files, see Todo above */
+		if (fnam.len == 0 || fnam.str[fnam.len - 1] == '/') {
+			/* break here for now */
+			fnam.len = 0U;
+			fnam.str = NULL;
+			break;
+		}
+		/* bang to our string pool, so we save a
+		 * malloc()+free() roundtrip */
+		if (fnam.len + 1U > w->pool.len) {
+			w->pool.len = ((fnam.len + 64U) / 64U) * 64U;
+			w->pool.str = realloc(w->pool.str, w->pool.len);
+		}
+		memcpy(w->pool.str, fnam.str, fnam.len);
+		w->pool.str[fnam.len] = '\0';
+		/* let no one else know about the pool, it's a secret, shhh */
+		fnam.str = w->pool.str;
+
+		/* snarf mtime or deduce from rtime
+		 * this is a custom header added by our writer, it's quite
+		 * hard to believe anyone else would go through with it
+		 * (apart from being part of some http responses of course) */
+		if ((mtime = _warc_rdmtm(buf, eoh - buf)) == (time_t)-1) {
+			mtime = rtime;
+		}
+		break;
+	default:
+		fnam.len = 0U;
+		fnam.str = NULL;
+		break;
+	}
+
+	/* now eat some of those delicious buffer bits */
+	__archive_read_consume(a, eoh - buf);
+
+	switch (ftyp) {
+	case WT_RSRC:
+	case WT_RSP:
+		if (fnam.len > 0U) {
+			/* populate entry object */
+			archive_entry_set_filetype(entry, AE_IFREG);
+			archive_entry_copy_pathname(entry, fnam.str);
+			archive_entry_set_size(entry, cntlen);
+			archive_entry_set_perm(entry, 0644);
+			/* rtime is the new ctime, mtime stays mtime */
+			archive_entry_set_ctime(entry, rtime, 0L);
+			archive_entry_set_mtime(entry, mtime, 0L);
+			break;
+		}
+		/* FALLTHROUGH */
+	default:
+		/* consume the content and start over */
+		_warc_skip(a);
+		goto start_over;
+	}
+	return (ARCHIVE_OK);
+}
+
+static int
+_warc_read(struct archive_read *a, const void **buf, size_t *bsz, int64_t *off)
+{
+	struct warc_s *w = a->format->data;
+	const char *rab;
+	ssize_t nrd;
+
+	if (w->cntoff >= w->cntlen) {
+	eof:
+		/* it's our lucky day, no work, we can leave early */
+		*buf = NULL;
+		*bsz = 0U;
+		*off = w->cntoff + 4U/*for \r\n\r\n separator*/;
+		w->unconsumed = 0U;
+		return (ARCHIVE_EOF);
+	}
+
+	rab = __archive_read_ahead(a, 1U, &nrd);
+	if (nrd < 0) {
+		*bsz = 0U;
+		/* big catastrophe */
+		return (int)nrd;
+	} else if (nrd == 0) {
+		goto eof;
+	} else if ((size_t)nrd > w->cntlen - w->cntoff) {
+		/* clamp to content-length */
+		nrd = w->cntlen - w->cntoff;
+	}
+	*off = w->cntoff;
+	*bsz = nrd;
+	*buf = rab;
+
+	w->cntoff += nrd;
+	w->unconsumed = (size_t)nrd;
+	return (ARCHIVE_OK);
+}
+
+static int
+_warc_skip(struct archive_read *a)
+{
+	struct warc_s *w = a->format->data;
+
+	__archive_read_consume(a, w->cntlen + 4U/*\r\n\r\n separator*/);
+	w->cntlen = 0U;
+	w->cntoff = 0U;
+	return (ARCHIVE_OK);
+}
+
+
+/* private routines */
+static void*
+deconst(const void *c)
+{
+	return (char *)0x1 + (((const char *)c) - (const char *)0x1);
+}
+
+static char*
+xmemmem(const char *hay, const size_t haysize,
+	const char *needle, const size_t needlesize)
+{
+	const char *const eoh = hay + haysize;
+	const char *const eon = needle + needlesize;
+	const char *hp;
+	const char *np;
+	const char *cand;
+	unsigned int hsum;
+	unsigned int nsum;
+	unsigned int eqp;
+
+	/* trivial checks first
+         * a 0-sized needle is defined to be found anywhere in haystack
+         * then run strchr() to find a candidate in HAYSTACK (i.e. a portion
+         * that happens to begin with *NEEDLE) */
+	if (needlesize == 0UL) {
+		return deconst(hay);
+	} else if ((hay = memchr(hay, *needle, haysize)) == NULL) {
+		/* trivial */
+		return NULL;
+	}
+
+	/* First characters of haystack and needle are the same now. Both are
+	 * guaranteed to be at least one character long.  Now computes the sum
+	 * of characters values of needle together with the sum of the first
+	 * needle_len characters of haystack. */
+	for (hp = hay + 1U, np = needle + 1U, hsum = *hay, nsum = *hay, eqp = 1U;
+	     hp < eoh && np < eon;
+	     hsum ^= *hp, nsum ^= *np, eqp &= *hp == *np, hp++, np++);
+
+	/* HP now references the (NEEDLESIZE + 1)-th character. */
+	if (np < eon) {
+		/* haystack is smaller than needle, :O */
+		return NULL;
+	} else if (eqp) {
+		/* found a match */
+		return deconst(hay);
+	}
+
+	/* now loop through the rest of haystack,
+	 * updating the sum iteratively */
+	for (cand = hay; hp < eoh; hp++) {
+		hsum ^= *cand++;
+		hsum ^= *hp;
+
+		/* Since the sum of the characters is already known to be
+		 * equal at that point, it is enough to check just NEEDLESIZE - 1
+		 * characters for equality,
+		 * also CAND is by design < HP, so no need for range checks */
+		if (hsum == nsum && memcmp(cand, needle, needlesize - 1U) == 0) {
+			return deconst(cand);
+		}
+	}
+	return NULL;
+}
+
+static int
+strtoi_lim(const char *str, const char **ep, int llim, int ulim)
+{
+	int res = 0;
+	const char *sp;
+	/* we keep track of the number of digits via rulim */
+	int rulim;
+
+	for (sp = str, rulim = ulim > 10 ? ulim : 10;
+	     res * 10 <= ulim && rulim && *sp >= '0' && *sp <=
'9';
+	     sp++, rulim /= 10) {
+		res *= 10;
+		res += *sp - '0';
+	}
+	if (sp == str) {
+		res = -1;
+	} else if (res < llim || res > ulim) {
+		res = -2;
+	}
+	*ep = (const char*)sp;
+	return res;
+}
+
+static time_t
+time_from_tm(struct tm *t)
+{
+#if HAVE_TIMEGM
+        /* Use platform timegm() if available. */
+        return (timegm(t));
+#elif HAVE__MKGMTIME64
+        return (_mkgmtime64(t));
+#else
+        /* Else use direct calculation using POSIX assumptions. */
+        /* First, fix up tm_yday based on the year/month/day. */
+        if (mktime(t) == (time_t)-1)
+                return ((time_t)-1);
+        /* Then we can compute timegm() from first principles. */
+        return (t->tm_sec
+            + t->tm_min * 60
+            + t->tm_hour * 3600
+            + t->tm_yday * 86400
+            + (t->tm_year - 70) * 31536000
+            + ((t->tm_year - 69) / 4) * 86400
+            - ((t->tm_year - 1) / 100) * 86400
+            + ((t->tm_year + 299) / 400) * 86400);
+#endif
+}
+
+static time_t
+xstrpisotime(const char *s, char **endptr)
+{
+/** like strptime() but strictly for ISO 8601 Zulu strings */
+	struct tm tm;
+	time_t res = (time_t)-1;
+
+	/* make sure tm is clean */
+	memset(&tm, 0, sizeof(tm));
+
+	/* as a courtesy to our callers, and since this is a non-standard
+	 * routine, we skip leading whitespace */
+	while (*s == ' ' || *s == '\t')
+		++s;
+
+	/* read year */
+	if ((tm.tm_year = strtoi_lim(s, &s, 1583, 4095)) < 0 || *s++ != '-') {
+		goto out;
+	}
+	/* read month */
+	if ((tm.tm_mon = strtoi_lim(s, &s, 1, 12)) < 0 || *s++ != '-') {
+		goto out;
+	}
+	/* read day-of-month */
+	if ((tm.tm_mday = strtoi_lim(s, &s, 1, 31)) < 0 || *s++ != 'T') {
+		goto out;
+	}
+	/* read hour */
+	if ((tm.tm_hour = strtoi_lim(s, &s, 0, 23)) < 0 || *s++ != ':') {
+		goto out;
+	}
+	/* read minute */
+	if ((tm.tm_min = strtoi_lim(s, &s, 0, 59)) < 0 || *s++ != ':') {
+		goto out;
+	}
+	/* read second */
+	if ((tm.tm_sec = strtoi_lim(s, &s, 0, 60)) < 0 || *s++ != 'Z') {
+		goto out;
+	}
+
+	/* massage TM to fulfill some of POSIX' constraints */
+	tm.tm_year -= 1900;
+	tm.tm_mon--;
+
+	/* now convert our custom tm struct to a unix stamp using UTC */
+	res = time_from_tm(&tm);
+
+out:
+	if (endptr != NULL) {
+		*endptr = deconst(s);
+	}
+	return res;
+}
+
+static unsigned int
+_warc_rdver(const char *buf, size_t bsz)
+{
+	static const char magic[] = "WARC/";
+	const char *c;
+	unsigned int ver = 0U;
+	unsigned int end = 0U;
+
+	if (bsz < 12 || memcmp(buf, magic, sizeof(magic) - 1U) != 0) {
+		/* buffer too small or invalid magic */
+		return ver;
+	}
+	/* looks good so far, read the version number for a laugh */
+	buf += sizeof(magic) - 1U;
+
+	if (isdigit((unsigned char)buf[0U]) && (buf[1U] == '.') &&
+	    isdigit((unsigned char)buf[2U])) {
+		/* we support a maximum of 2 digits in the minor version */
+		if (isdigit((unsigned char)buf[3U]))
+			end = 1U;
+		/* set up major version */
+		ver = (buf[0U] - '0') * 10000U;
+		/* set up minor version */
+		if (end == 1U) {
+			ver += (buf[2U] - '0') * 1000U;
+			ver += (buf[3U] - '0') * 100U;
+		} else
+			ver += (buf[2U] - '0') * 100U;
+		/*
+		 * WARC below version 0.12 has a space-separated header
+		 * WARC 0.12 and above terminates the version with a CRLF
+		 */
+		c = buf + 3U + end;
+		if (ver >= 1200U) {
+			if (memcmp(c, "\r\n", 2U) != 0)
+				ver = 0U;
+		} else if (ver < 1200U) {
+			if (*c != ' ' && *c != '\t')
+				ver = 0U;
+		}
+	}
+	return ver;
+}
+
+static unsigned int
+_warc_rdtyp(const char *buf, size_t bsz)
+{
+	static const char _key[] = "\r\nWARC-Type:";
+	const char *val, *eol;
+
+	if ((val = xmemmem(buf, bsz, _key, sizeof(_key) - 1U)) == NULL) {
+		/* no bother */
+		return WT_NONE;
+	}
+	val += sizeof(_key) - 1U;
+	if ((eol = _warc_find_eol(val, buf + bsz - val)) == NULL) {
+		/* no end of line */
+		return WT_NONE;
+	}
+
+	/* overread whitespace */
+	while (val < eol && (*val == ' ' || *val == '\t'))
+		++val;
+
+	if (val + 8U == eol) {
+		if (memcmp(val, "resource", 8U) == 0)
+			return WT_RSRC;
+		else if (memcmp(val, "response", 8U) == 0)
+			return WT_RSP;
+	}
+	return WT_NONE;
+}
+
+static warc_string_t
+_warc_rduri(const char *buf, size_t bsz)
+{
+	static const char _key[] = "\r\nWARC-Target-URI:";
+	const char *val, *uri, *eol, *p;
+	warc_string_t res = {0U, NULL};
+
+	if ((val = xmemmem(buf, bsz, _key, sizeof(_key) - 1U)) == NULL) {
+		/* no bother */
+		return res;
+	}
+	/* overread whitespace */
+	val += sizeof(_key) - 1U;
+	if ((eol = _warc_find_eol(val, buf + bsz - val)) == NULL) {
+		/* no end of line */
+		return res;
+	}
+
+	while (val < eol && (*val == ' ' || *val == '\t'))
+		++val;
+
+	/* overread URL designators */
+	if ((uri = xmemmem(val, eol - val, "://", 3U)) == NULL) {
+		/* not touching that! */
+		return res;
+	}
+
+	/* spaces inside uri are not allowed, CRLF should follow */
+	for (p = val; p < eol; p++) {
+		if (isspace((unsigned char)*p))
+			return res;
+	}
+
+	/* there must be at least space for ftp */
+	if (uri < (val + 3U))
+		return res;
+
+	/* move uri to point to after :// */
+	uri += 3U;
+
+	/* now then, inspect the URI */
+	if (memcmp(val, "file", 4U) == 0) {
+		/* perfect, nothing left to do here */
+
+	} else if (memcmp(val, "http", 4U) == 0 ||
+		   memcmp(val, "ftp", 3U) == 0) {
+		/* overread domain, and the first / */
+		while (uri < eol && *uri++ != '/');
+	} else {
+		/* not sure what to do? best to bugger off */
+		return res;
+	}
+	res.str = uri;
+	res.len = eol - uri;
+	return res;
+}
+
+static ssize_t
+_warc_rdlen(const char *buf, size_t bsz)
+{
+	static const char _key[] = "\r\nContent-Length:";
+	const char *val, *eol;
+	char *on = NULL;
+	long int len;
+
+	if ((val = xmemmem(buf, bsz, _key, sizeof(_key) - 1U)) == NULL) {
+		/* no bother */
+		return -1;
+	}
+	val += sizeof(_key) - 1U;
+	if ((eol = _warc_find_eol(val, buf + bsz - val)) == NULL) {
+		/* no end of line */
+		return -1;
+	}
+
+	/* skip leading whitespace */
+	while (val < eol && (*val == ' ' || *val == '\t'))
+		val++;
+	/* there must be at least one digit */
+	if (!isdigit((unsigned char)*val))
+		return -1;
+	len = strtol(val, &on, 10);
+	if (on != eol) {
+		/* line must end here */
+		return -1;
+	}
+
+	return (size_t)len;
+}
+
+static time_t
+_warc_rdrtm(const char *buf, size_t bsz)
+{
+	static const char _key[] = "\r\nWARC-Date:";
+	const char *val, *eol;
+	char *on = NULL;
+	time_t res;
+
+	if ((val = xmemmem(buf, bsz, _key, sizeof(_key) - 1U)) == NULL) {
+		/* no bother */
+		return (time_t)-1;
+	}
+	val += sizeof(_key) - 1U;
+	if ((eol = _warc_find_eol(val, buf + bsz - val)) == NULL ) {
+		/* no end of line */
+		return -1;
+	}
+
+	/* xstrpisotime() kindly overreads whitespace for us, so use that */
+	res = xstrpisotime(val, &on);
+	if (on != eol) {
+		/* line must end here */
+		return -1;
+	}
+	return res;
+}
+
+static time_t
+_warc_rdmtm(const char *buf, size_t bsz)
+{
+	static const char _key[] = "\r\nLast-Modified:";
+	const char *val, *eol;
+	char *on = NULL;
+	time_t res;
+
+	if ((val = xmemmem(buf, bsz, _key, sizeof(_key) - 1U)) == NULL) {
+		/* no bother */
+		return (time_t)-1;
+	}
+	val += sizeof(_key) - 1U;
+	if ((eol = _warc_find_eol(val, buf + bsz - val)) == NULL ) {
+		/* no end of line */
+		return -1;
+	}
+
+	/* xstrpisotime() kindly overreads whitespace for us, so use that */
+	res = xstrpisotime(val, &on);
+	if (on != eol) {
+		/* line must end here */
+		return -1;
+	}
+	return res;
+}
+
+static const char*
+_warc_find_eoh(const char *buf, size_t bsz)
+{
+	static const char _marker[] = "\r\n\r\n";
+	const char *hit = xmemmem(buf, bsz, _marker, sizeof(_marker) - 1U);
+
+	if (hit != NULL) {
+		hit += sizeof(_marker) - 1U;
+	}
+	return hit;
+}
+
+static const char*
+_warc_find_eol(const char *buf, size_t bsz)
+{
+	static const char _marker[] = "\r\n";
+	const char *hit = xmemmem(buf, bsz, _marker, sizeof(_marker) - 1U);
+
+	return hit;
+}
+/* archive_read_support_format_warc.c ends here */


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