1 files changed, 307 insertions, 173 deletions

diff --git a/ext/zip/lib/zip_open.c b/ext/zip/lib/zip_open.c
index 5ce1c1070a..d91fe469db 100644
--- a/ext/zip/lib/zip_open.c
+++ b/ext/zip/lib/zip_open.c
@@ -1,6 +1,6 @@
 /*
   zip_open.c -- open zip archive by name
-  Copyright (C) 1999-2011 Dieter Baron and Thomas Klausner
+  Copyright (C) 1999-2012 Dieter Baron and Thomas Klausner
 
   This file is part of libzip, a library to manipulate ZIP archives.
   The authors can be contacted at <libzip@nih.at>
@@ -42,38 +42,53 @@
 
 #include "zipint.h"
 
-static void set_error(int *, struct zip_error *, int);
-static struct zip *_zip_allocate_new(const char *, int *);
-static int _zip_checkcons(FILE *, struct zip_cdir *, struct zip_error *);
-static void _zip_check_torrentzip(struct zip *);
-static struct zip_cdir *_zip_find_central_dir(FILE *, int, int *, off_t);
-static int _zip_file_exists(const char *, int, int *);
-static int _zip_headercomp(struct zip_dirent *, int,
-			   struct zip_dirent *, int);
-static unsigned char *_zip_memmem(const unsigned char *, int,
-				  const unsigned char *, int);
-static struct zip_cdir *_zip_readcdir(FILE *, off_t, unsigned char *, unsigned char *,
-				 int, int, struct zip_error *);
+static void set_error(int *, const struct zip_error *, int);
+static struct zip *_zip_allocate_new(const char *, unsigned int, int *);
+static zip_int64_t _zip_checkcons(FILE *, struct zip_cdir *, struct zip_error *);
+static void _zip_check_torrentzip(struct zip *, const struct zip_cdir *);
+static struct zip_cdir *_zip_find_central_dir(FILE *, unsigned int, int *, off_t);
+static int _zip_file_exists(const char *, unsigned int, int *);
+static int _zip_headercomp(const struct zip_dirent *, const struct zip_dirent *);
+static unsigned char *_zip_memmem(const unsigned char *, size_t,
+				  const unsigned char *, size_t);
+static struct zip_cdir *_zip_readcdir(FILE *, off_t, unsigned char *, const unsigned char *,
+				 size_t, unsigned int, struct zip_error *);
+static struct zip_cdir *_zip_read_eocd(const unsigned char *, const unsigned char *, off_t,
+				       size_t, unsigned int, struct zip_error *);
+static struct zip_cdir *_zip_read_eocd64(FILE *, const unsigned char *, const unsigned char *,
+					 off_t, size_t, unsigned int, struct zip_error *);
 
 
 
-ZIP_EXTERN(struct zip *)
-zip_open(const char *fn, int flags, int *zep)
+ZIP_EXTERN struct zip *
+zip_open(const char *fn, int _flags, int *zep)
 {
     FILE *fp;
-
-    if (flags & ZIP_OVERWRITE) {
-	return _zip_allocate_new(fn, zep);
+    unsigned int flags;
+    
+    if (_flags < 0) {
+        if (zep)
+            *zep = ZIP_ER_INVAL;
+        return NULL;
     }
-
+    flags = (unsigned int)_flags;
+        
     switch (_zip_file_exists(fn, flags, zep)) {
     case -1:
-			if (!(flags & ZIP_OVERWRITE)) {
-				return NULL;
-			}
+	return NULL;
     case 0:
-	return _zip_allocate_new(fn, zep);
+	return _zip_allocate_new(fn, flags, zep);
     default:
+	if (flags & ZIP_TRUNCATE) {
+	    FILE *f;
+	    
+	    if ((f = fopen(fn, "rb")) == NULL) {
+		set_error(zep, NULL, ZIP_ER_OPEN);
+		return NULL;
+	    }
+	    fclose(f);
+	    return _zip_allocate_new(fn, flags, zep);
+	}
 	break;
     }
 
@@ -82,17 +97,36 @@ zip_open(const char *fn, int flags, int *zep)
 	return NULL;
     }
 
-    return _zip_open(fn, fp, flags, 0, zep);
+    return _zip_open(fn, fp, flags, zep);
 }
 
+
+ZIP_EXTERN int
+zip_archive_set_tempdir(struct zip *za, const char *tempdir)
+{
+    char *new_tempdir;
+    
+    if (tempdir) {
+        if ((new_tempdir = strdup(tempdir)) == NULL) {
+            _zip_error_set(&za->error, ZIP_ER_MEMORY, errno);
+            return -1;
+        }
+    }
+    else
+        new_tempdir = NULL;
+    
+    free(za->tempdir);
+    za->tempdir = new_tempdir;
+    
+    return 0;
+}
 
 
 struct zip *
-_zip_open(const char *fn, FILE *fp, int flags, int aflags, int *zep)
+_zip_open(const char *fn, FILE *fp, unsigned int flags, int *zep)
 {
     struct zip *za;
     struct zip_cdir *cdir;
-    int i;
     off_t len;
 
     if (fseeko(fp, 0, SEEK_END) < 0) {
@@ -103,7 +137,7 @@ _zip_open(const char *fn, FILE *fp, int flags, int aflags, int *zep)
 
     /* treat empty files as empty archives */
     if (len == 0) {
-	if ((za=_zip_allocate_new(fn, zep)) == NULL)
+	if ((za=_zip_allocate_new(fn, flags, zep)) == NULL)
 	    fclose(fp);
 	else
 	    za->zp = fp;
@@ -116,34 +150,32 @@ _zip_open(const char *fn, FILE *fp, int flags, int aflags, int *zep)
 	return NULL;
     }
 
-    if ((za=_zip_allocate_new(fn, zep)) == NULL) {
+    if ((za=_zip_allocate_new(fn, flags, zep)) == NULL) {
 	_zip_cdir_free(cdir);
 	fclose(fp);
 	return NULL;
     }
 
-    za->cdir = cdir;
+    za->entry = cdir->entry;
+    za->nentry = cdir->nentry;
+    za->nentry_alloc = cdir->nentry_alloc;
+    za->comment_orig = cdir->comment;
+    
     za->zp = fp;
 
-    if ((za->entry=(struct zip_entry *)malloc(sizeof(*(za->entry))
-					      * cdir->nentry)) == NULL) {
-	set_error(zep, NULL, ZIP_ER_MEMORY);
-	_zip_free(za);
-	return NULL;
-    }
-    for (i=0; i<cdir->nentry; i++)
-	_zip_entry_new(za);
+    _zip_check_torrentzip(za, cdir);
 
-    _zip_check_torrentzip(za);
     za->ch_flags = za->flags;
 
+    free(cdir);
+
     return za;
 }
 
 
 
 static void
-set_error(int *zep, struct zip_error *err, int ze)
+set_error(int *zep, const struct zip_error *err, int ze)
 {
     int se;
 
@@ -166,16 +198,17 @@ set_error(int *zep, struct zip_error *err, int ze)
    entries, or NULL if unsuccessful. */
 
 static struct zip_cdir *
-_zip_readcdir(FILE *fp, off_t buf_offset, unsigned char *buf, unsigned char *eocd, int buflen,
-	      int flags, struct zip_error *error)
+_zip_readcdir(FILE *fp, off_t buf_offset, unsigned char *buf, const unsigned char *eocd, size_t buflen,
+	      unsigned int flags, struct zip_error *error)
 {
     struct zip_cdir *cd;
-    unsigned char *cdp, **bufp;
-    int i, comlen, nentry;
-    zip_uint32_t left;
+    const unsigned char *cdp;
+    const unsigned char **bufp;
+    zip_int64_t tail_len, comment_len;
+    zip_uint64_t i, left;
 
-    comlen = buf + buflen - eocd - EOCDLEN;
-    if (comlen < 0) {
+    tail_len = buf + buflen - eocd - EOCDLEN;
+    if (tail_len < 0) {
 	/* not enough bytes left for comment */
 	_zip_error_set(error, ZIP_ER_NOZIP, 0);
 	return NULL;
@@ -192,46 +225,32 @@ _zip_readcdir(FILE *fp, off_t buf_offset, unsigned char *buf, unsigned char *eoc
 	return NULL;
     }
 
-    cdp = eocd + 8;
-    /* number of cdir-entries on this disk */
-    i = _zip_read2(&cdp);
-    /* number of cdir-entries */
-    nentry = _zip_read2(&cdp);
+    if (eocd-EOCD64LOCLEN >= buf && memcmp(eocd-EOCD64LOCLEN, EOCD64LOC_MAGIC, 4) == 0)
+	cd = _zip_read_eocd64(fp, eocd-EOCD64LOCLEN, buf, buf_offset, buflen, flags, error);
+    else
+	cd = _zip_read_eocd(eocd, buf, buf_offset, buflen, flags, error);
 
-    if ((cd=_zip_cdir_new(nentry, error)) == NULL)
+    if (cd == NULL)
 	return NULL;
 
-    cd->size = _zip_read4(&cdp);
-    cd->offset = _zip_read4(&cdp);
-    cd->comment = NULL;
-    cd->comment_len = _zip_read2(&cdp);
+    cdp = eocd + 20;
+    comment_len = _zip_read2(&cdp);
 
-    if (((zip_uint64_t)cd->offset)+cd->size > buf_offset + (eocd-buf)) {
+    if ((zip_uint64_t)cd->offset+(zip_uint64_t)cd->size > (zip_uint64_t)buf_offset + (zip_uint64_t)(eocd-buf)) {
 	/* cdir spans past EOCD record */
 	_zip_error_set(error, ZIP_ER_INCONS, 0);
-	cd->nentry = 0;
 	_zip_cdir_free(cd);
 	return NULL;
     }
 
-    if ((comlen < cd->comment_len) || (cd->nentry != i)) {
-	_zip_error_set(error, ZIP_ER_NOZIP, 0);
-	cd->nentry = 0;
-	_zip_cdir_free(cd);
-	return NULL;
-    }
-    if ((flags & ZIP_CHECKCONS) && comlen != cd->comment_len) {
+    if (tail_len < comment_len || ((flags & ZIP_CHECKCONS) && tail_len != comment_len)) {
 	_zip_error_set(error, ZIP_ER_INCONS, 0);
-	cd->nentry = 0;
 	_zip_cdir_free(cd);
 	return NULL;
     }
 
-    if (cd->comment_len) {
-	if ((cd->comment=(char *)_zip_memdup(eocd+EOCDLEN,
-					     cd->comment_len, error))
-	    == NULL) {
-	    cd->nentry = 0;
+    if (comment_len) {
+	if ((cd->comment=_zip_string_new(eocd+EOCDLEN, (zip_uint16_t)comment_len, ZIP_FL_ENC_GUESS, error)) == NULL) {
 	    _zip_cdir_free(cd);
 	    return NULL;
 	}
@@ -249,40 +268,32 @@ _zip_readcdir(FILE *fp, off_t buf_offset, unsigned char *buf, unsigned char *eoc
 	fseeko(fp, cd->offset, SEEK_SET);
 	/* possible consistency check: cd->offset =
 	   len-(cd->size+cd->comment_len+EOCDLEN) ? */
-	if (ferror(fp) || ((unsigned long)ftello(fp) != cd->offset)) {
+	if (ferror(fp) || (ftello(fp) != cd->offset)) {
 	    /* seek error or offset of cdir wrong */
 	    if (ferror(fp))
 		_zip_error_set(error, ZIP_ER_SEEK, errno);
 	    else
 		_zip_error_set(error, ZIP_ER_NOZIP, 0);
-	    cd->nentry = 0;
 	    _zip_cdir_free(cd);
 	    return NULL;
 	}
     }
 
-    left = cd->size;
+    left = (zip_uint64_t)cd->size;
     i=0;
     while (i<cd->nentry && left > 0) {
-	if ((_zip_dirent_read(cd->entry+i, fp, bufp, &left, 0, error)) < 0) {
-	    cd->nentry = i;
+	if ((cd->entry[i].orig=_zip_dirent_new()) == NULL
+	    || (_zip_dirent_read(cd->entry[i].orig, fp, bufp, &left, 0, error)) < 0) {
 	    _zip_cdir_free(cd);
 	    return NULL;
 	}
 	i++;
-	
-	if (i == cd->nentry && left > 0) {
-	    /* Infozip extension for more than 64k entries:
-	       nentries wraps around, size indicates correct EOCD */
-	    if (_zip_cdir_grow(cd, cd->nentry+ZIP_UINT16_MAX, error) < 0) {
-		cd->nentry = i;
-		_zip_cdir_free(cd);
-		return NULL;
-	    }
-	}
     }
-
-    cd->nentry = i;
+    if (i != cd->nentry || ((flags & ZIP_CHECKCONS) && left != 0)) {
+        _zip_error_set(error, ZIP_ER_INCONS, 0);
+        _zip_cdir_free(cd);
+        return NULL;
+    }
     
     return cd;
 }
@@ -295,54 +306,59 @@ _zip_readcdir(FILE *fp, off_t buf_offset, unsigned char *buf, unsigned char *eoc
    file and header offsets. Returns -1 if not plausible, else the
    difference between the lowest and the highest fileposition reached */
 
-static int
+static zip_int64_t
 _zip_checkcons(FILE *fp, struct zip_cdir *cd, struct zip_error *error)
 {
-    int i;
-    unsigned int min, max, j;
+    zip_uint64_t i;
+    zip_uint64_t min, max, j;
     struct zip_dirent temp;
 
     if (cd->nentry) {
-	max = cd->entry[0].offset;
-	min = cd->entry[0].offset;
+	max = cd->entry[0].orig->offset;
+	min = cd->entry[0].orig->offset;
     }
     else
 	min = max = 0;
 
     for (i=0; i<cd->nentry; i++) {
-	if (cd->entry[i].offset < min)
-	    min = cd->entry[i].offset;
-	if (min > cd->offset) {
+	if (cd->entry[i].orig->offset < min)
+	    min = cd->entry[i].orig->offset;
+	if (min > (zip_uint64_t)cd->offset) {
 	    _zip_error_set(error, ZIP_ER_NOZIP, 0);
 	    return -1;
 	}
 	
-	j = cd->entry[i].offset + cd->entry[i].comp_size
-	    + cd->entry[i].filename_len + LENTRYSIZE;
+	j = cd->entry[i].orig->offset + cd->entry[i].orig->comp_size
+	    + _zip_string_length(cd->entry[i].orig->filename) + LENTRYSIZE;
 	if (j > max)
 	    max = j;
-	if (max > cd->offset) {
+	if (max > (zip_uint64_t)cd->offset) {
 	    _zip_error_set(error, ZIP_ER_NOZIP, 0);
 	    return -1;
 	}
 	
-	if (fseeko(fp, cd->entry[i].offset, SEEK_SET) != 0) {
-	    _zip_error_set(error, ZIP_ER_SEEK, 0);
+	if (fseeko(fp, (off_t)cd->entry[i].orig->offset, SEEK_SET) != 0) {
+	    _zip_error_set(error, ZIP_ER_SEEK, errno);
 	    return -1;
 	}
 	
 	if (_zip_dirent_read(&temp, fp, NULL, NULL, 1, error) == -1)
 	    return -1;
 	
-	if (_zip_headercomp(cd->entry+i, 0, &temp, 1) != 0) {
+	if (_zip_headercomp(cd->entry[i].orig, &temp) != 0) {
 	    _zip_error_set(error, ZIP_ER_INCONS, 0);
 	    _zip_dirent_finalize(&temp);
 	    return -1;
 	}
+	
+	cd->entry[i].orig->extra_fields = _zip_ef_merge(cd->entry[i].orig->extra_fields, temp.extra_fields);
+	cd->entry[i].orig->local_extra_fields_read = 1;
+	temp.extra_fields = NULL;
+	
 	_zip_dirent_finalize(&temp);
     }
 
-    return max - min;
+    return (max-min) < ZIP_INT64_MAX ? (zip_int64_t)(max-min) : ZIP_INT64_MAX;
 }
 
 
@@ -351,28 +367,27 @@ _zip_checkcons(FILE *fp, struct zip_cdir *cd, struct zip_error *error)
    check whether ZA has a valid TORRENTZIP comment, i.e. is torrentzipped */
 
 static void
-_zip_check_torrentzip(struct zip *za)
+_zip_check_torrentzip(struct zip *za, const struct zip_cdir *cdir)
 {
     uLong crc_got, crc_should;
     char buf[8+1];
     char *end;
 
-    if (za->zp == NULL || za->cdir == NULL)
+    if (za->zp == NULL || cdir == NULL)
 	return;
 
-    if (za->cdir->comment_len != TORRENT_SIG_LEN+8
-	|| strncmp(za->cdir->comment, TORRENT_SIG, TORRENT_SIG_LEN) != 0)
+    if (_zip_string_length(cdir->comment) != TORRENT_SIG_LEN+8
+	|| strncmp((const char *)cdir->comment->raw, TORRENT_SIG, TORRENT_SIG_LEN) != 0)
 	return;
 
-    memcpy(buf, za->cdir->comment+TORRENT_SIG_LEN, 8);
+    memcpy(buf, cdir->comment->raw+TORRENT_SIG_LEN, 8);
     buf[8] = '\0';
     errno = 0;
     crc_should = strtoul(buf, &end, 16);
     if ((crc_should == UINT_MAX && errno != 0) || (end && *end))
 	return;
 
-    if (_zip_filerange_crc(za->zp, za->cdir->offset, za->cdir->size,
-			   &crc_got, NULL) < 0)
+    if (_zip_filerange_crc(za->zp, cdir->offset, cdir->size, &crc_got, NULL) < 0)
 	return;
 
     if (crc_got == crc_should)
@@ -383,68 +398,32 @@ _zip_check_torrentzip(struct zip *za)
 
 
 /* _zip_headercomp:
-   compares two headers h1 and h2; if they are local headers, set
-   local1p or local2p respectively to 1, else 0. Return 0 if they
-   are identical, -1 if not. */
+   compares a central directory entry and a local file header
+   Return 0 if they are consistent, -1 if not. */
 
 static int
-_zip_headercomp(struct zip_dirent *h1, int local1p, struct zip_dirent *h2,
-	   int local2p)
+_zip_headercomp(const struct zip_dirent *central, const struct zip_dirent *local)
 {
-    if ((h1->version_needed != h2->version_needed)
+    if ((central->version_needed != local->version_needed)
 #if 0
 	/* some zip-files have different values in local
 	   and global headers for the bitflags */
-	|| (h1->bitflags != h2->bitflags)
+	|| (central->bitflags != local->bitflags)
 #endif
-	|| (h1->comp_method != h2->comp_method)
-	|| (h1->last_mod != h2->last_mod)
-	|| (h1->filename_len != h2->filename_len)
-	|| !h1->filename || !h2->filename
-	|| strcmp(h1->filename, h2->filename))
+	|| (central->comp_method != local->comp_method)
+	|| (central->last_mod != local->last_mod)
+	|| !_zip_string_equal(central->filename, local->filename))
 	return -1;
 
-    /* check that CRC and sizes are zero if data descriptor is used */
-    if ((h1->bitflags & ZIP_GPBF_DATA_DESCRIPTOR) && local1p
-	&& (h1->crc != 0
-	    || h1->comp_size != 0
-	    || h1->uncomp_size != 0))
-	return -1;
-    if ((h2->bitflags & ZIP_GPBF_DATA_DESCRIPTOR) && local2p
-	&& (h2->crc != 0
-	    || h2->comp_size != 0
-	    || h2->uncomp_size != 0))
-	return -1;
-    
-    /* check that CRC and sizes are equal if no data descriptor is used */
-    if (((h1->bitflags & ZIP_GPBF_DATA_DESCRIPTOR) == 0 || local1p == 0)
-	&& ((h2->bitflags & ZIP_GPBF_DATA_DESCRIPTOR) == 0 || local2p == 0)) {
-	if ((h1->crc != h2->crc)
-	    || (h1->comp_size != h2->comp_size)
-	    || (h1->uncomp_size != h2->uncomp_size))
+
+    if ((central->crc != local->crc) || (central->comp_size != local->comp_size)
+	|| (central->uncomp_size != local->uncomp_size)) {
+	/* InfoZip stores valid values in local header even when data descriptor is used.
+	   This is in violation of the appnote. */
+	if (((local->bitflags & ZIP_GPBF_DATA_DESCRIPTOR) == 0
+	     || local->crc != 0 || local->comp_size != 0 || local->uncomp_size != 0))
 	    return -1;
     }
-    
-    if ((local1p == local2p)
-	&& ((h1->extrafield_len != h2->extrafield_len)
-	    || (h1->extrafield_len && h2->extrafield
-		&& memcmp(h1->extrafield, h2->extrafield,
-			  h1->extrafield_len))))
-	return -1;
-
-    /* if either is local, nothing more to check */
-    if (local1p || local2p)
-	return 0;
-
-    if ((h1->version_madeby != h2->version_madeby)
-	|| (h1->disk_number != h2->disk_number)
-	|| (h1->int_attrib != h2->int_attrib)
-	|| (h1->ext_attrib != h2->ext_attrib)
-	|| (h1->offset != h2->offset)
-	|| (h1->comment_len != h2->comment_len)
-	|| (h1->comment_len && h2->comment
-	    && memcmp(h1->comment, h2->comment, h1->comment_len)))
-	return -1;
 
     return 0;
 }
@@ -452,7 +431,7 @@ _zip_headercomp(struct zip_dirent *h1, int local1p, struct zip_dirent *h2,
 
 
 static struct zip *
-_zip_allocate_new(const char *fn, int *zep)
+_zip_allocate_new(const char *fn, unsigned int flags, int *zep)
 {
     struct zip *za;
     struct zip_error error;
@@ -467,18 +446,19 @@ _zip_allocate_new(const char *fn, int *zep)
     else {
 	za->zn = strdup(fn);
 	if (!za->zn) {
-	    _zip_free(za);
+	    zip_discard(za);
 	    set_error(zep, NULL, ZIP_ER_MEMORY);
 	    return NULL;
 	}
     }
+    za->open_flags = flags;
     return za;
 }
 
 
 
 static int
-_zip_file_exists(const char *fn, int flags, int *zep)
+_zip_file_exists(const char *fn, unsigned int flags, int *zep)
 {
     struct stat st;
 
@@ -488,7 +468,7 @@ _zip_file_exists(const char *fn, int flags, int *zep)
     }
     
     if (stat(fn, &st) != 0) {
-	if (flags & ZIP_CREATE || flags & ZIP_OVERWRITE)
+	if (flags & ZIP_CREATE)
 	    return 0;
 	else {
 	    set_error(zep, NULL, ZIP_ER_OPEN);
@@ -508,14 +488,21 @@ _zip_file_exists(const char *fn, int flags, int *zep)
 
 
 static struct zip_cdir *
-_zip_find_central_dir(FILE *fp, int flags, int *zep, off_t len)
+_zip_find_central_dir(FILE *fp, unsigned int flags, int *zep, off_t len)
 {
     struct zip_cdir *cdir, *cdirnew;
     unsigned char *buf, *match;
     off_t buf_offset;
-    int a, best, buflen, i;
+    size_t buflen;
+    zip_int64_t a, i;
+    zip_int64_t best;
     struct zip_error zerr;
 
+    if (len < (off_t)EOCDLEN) {
+        set_error(zep, NULL, ZIP_ER_NOZIP);
+        return NULL;
+    }
+    
     i = fseeko(fp, -(len < CDBUFSIZE ? len : CDBUFSIZE), SEEK_END);
     if (i == -1 && errno != EFBIG) {
 	/* seek before start of file on my machine */
@@ -541,10 +528,10 @@ _zip_find_central_dir(FILE *fp, int flags, int *zep, off_t len)
     
     best = -1;
     cdir = NULL;
-    match = buf;
+    match = buf+ (buflen < CDBUFSIZE ? 0 : EOCD64LOCLEN);
     _zip_error_set(&zerr, ZIP_ER_NOZIP, 0);
 
-    while ((match=_zip_memmem(match, buflen-(match-buf)-18,
+    while ((match=_zip_memmem(match, buflen-(size_t)(match-buf)-(EOCDLEN-4),
 			      (const unsigned char *)EOCD_MAGIC, 4))!=NULL) {
 	/* found match -- check, if good */
 	/* to avoid finding the same match all over again */
@@ -589,8 +576,7 @@ _zip_find_central_dir(FILE *fp, int flags, int *zep, off_t len)
 
 
 static unsigned char *
-_zip_memmem(const unsigned char *big, int biglen, const unsigned char *little, 
-       int littlelen)
+_zip_memmem(const unsigned char *big, size_t biglen, const unsigned char *little, size_t littlelen)
 {
     const unsigned char *p;
     
@@ -598,11 +584,159 @@ _zip_memmem(const unsigned char *big, int biglen, const unsigned char *little,
 	return NULL;
     p = big-1;
     while ((p=(const unsigned char *)
-	        memchr(p+1, little[0], (size_t)(big-(p+1)+biglen-littlelen+1)))
-	   != NULL) {
+	        memchr(p+1, little[0], (size_t)(big-(p+1))+(size_t)(biglen-littlelen)+1)) != NULL) {
 	if (memcmp(p+1, little+1, littlelen-1)==0)
 	    return (unsigned char *)p;
     }
 
     return NULL;
 }
+
+
+
+static struct zip_cdir *
+_zip_read_eocd(const unsigned char *eocd, const unsigned char *buf, off_t buf_offset, size_t buflen,
+	       unsigned int flags, struct zip_error *error)
+{
+    struct zip_cdir *cd;
+    const unsigned char *cdp;
+    zip_uint64_t i, nentry, size, offset;
+
+    if (eocd+EOCDLEN > buf+buflen) {
+	_zip_error_set(error, ZIP_ER_INCONS, 0);
+	return NULL;
+    }
+
+    cdp = eocd + 8;
+
+    /* number of cdir-entries on this disk */
+    i = _zip_read2(&cdp);
+    /* number of cdir-entries */
+    nentry = _zip_read2(&cdp);
+
+    if (nentry != i) {
+	_zip_error_set(error, ZIP_ER_NOZIP, 0);
+	return NULL;
+    }
+
+    size = _zip_read4(&cdp);
+    offset = _zip_read4(&cdp);
+
+    if (size > ZIP_OFF_MAX || offset > ZIP_OFF_MAX || offset+size > ZIP_OFF_MAX) {
+        _zip_error_set(error, ZIP_ER_SEEK, EFBIG);
+        return NULL;
+    }
+    
+    if (offset+size > (zip_uint64_t)(buf_offset + (eocd-buf))) {
+	/* cdir spans past EOCD record */
+	_zip_error_set(error, ZIP_ER_INCONS, 0);
+	return NULL;
+    }
+
+    if ((flags & ZIP_CHECKCONS) && offset+size != (zip_uint64_t)(buf_offset + (eocd-buf))) {
+	_zip_error_set(error, ZIP_ER_INCONS, 0);
+	return NULL;
+    }
+
+    if ((cd=_zip_cdir_new(nentry, error)) == NULL)
+	return NULL;
+
+    cd->size = (off_t)size;
+    cd->offset = (off_t)offset;
+    
+    return cd;
+}
+
+
+
+static struct zip_cdir *
+_zip_read_eocd64(FILE *f, const zip_uint8_t *eocd64loc, const zip_uint8_t *buf,
+		 off_t buf_offset, size_t buflen, unsigned int flags, struct zip_error *error)
+{
+    struct zip_cdir *cd;
+    zip_uint64_t offset;
+    const zip_uint8_t *cdp;
+    zip_uint8_t eocd[EOCD64LEN];
+    zip_uint64_t eocd_offset;
+    zip_uint64_t size, nentry, i;
+
+    cdp = eocd64loc+8;
+    eocd_offset = _zip_read8(&cdp);
+    
+    if (eocd_offset > ZIP_OFF_MAX || eocd_offset + EOCD64LEN > ZIP_OFF_MAX) {
+        _zip_error_set(error, ZIP_ER_SEEK, EFBIG);
+        return NULL;
+    }
+
+    if (eocd64loc < buf || (off_t)eocd_offset+EOCD64LEN > (buf_offset+(eocd64loc-buf))) {
+	_zip_error_set(error, ZIP_ER_INCONS, 0);
+	return NULL;
+    }
+
+    if ((off_t)eocd_offset >= buf_offset && (off_t)eocd_offset+EOCD64LEN <= buf_offset+(ssize_t)buflen)
+	cdp = buf+((off_t)eocd_offset-buf_offset);
+    else {
+	if (fseeko(f, (off_t)eocd_offset, SEEK_SET) != 0) {
+	    _zip_error_set(error, ZIP_ER_SEEK, errno);
+	    return NULL;
+	}
+
+	clearerr(f);
+	if (fread(eocd, 1, EOCD64LEN, f) < EOCD64LEN) {
+            _zip_error_set(error, ZIP_ER_READ, errno);
+            return NULL;
+        }
+
+	if (ferror(f)) {
+	    _zip_error_set(error, ZIP_ER_READ, errno);
+	    return NULL;
+	}
+
+	cdp = eocd;
+    }
+
+    if (memcmp(cdp, EOCD64_MAGIC, 4) != 0) {
+	_zip_error_set(error, ZIP_ER_INCONS, 0);
+	return NULL;
+    }
+    cdp += 4;
+    
+    size = _zip_read8(&cdp);
+
+    if ((flags & ZIP_CHECKCONS) && size+eocd_offset+12 != (zip_uint64_t)(buf_offset+(eocd64loc-buf))) {
+	_zip_error_set(error, ZIP_ER_INCONS, 0);
+	return NULL;
+    }
+
+    cdp += 4; /* skip version made by/needed */
+    cdp += 8; /* skip num disks */
+    
+    nentry = _zip_read8(&cdp);
+    i = _zip_read8(&cdp);
+
+    if (nentry != i) {
+	_zip_error_set(error, ZIP_ER_MULTIDISK, 0);
+	return NULL;
+    }
+
+    size = _zip_read8(&cdp);
+    offset = _zip_read8(&cdp);
+
+    if (size > ZIP_OFF_MAX || offset > ZIP_OFF_MAX || offset+size > ZIP_OFF_MAX) {
+        _zip_error_set(error, ZIP_ER_SEEK, EFBIG);
+        return NULL;
+    }
+    if ((flags & ZIP_CHECKCONS) && offset+size != eocd_offset) {
+	_zip_error_set(error, ZIP_ER_INCONS, 0);
+	return NULL;
+    }
+
+    if ((cd=_zip_cdir_new(nentry, error)) == NULL)
+	return NULL;
+
+    
+    cd->size = (off_t)size;
+    cd->offset = (off_t)offset;
+
+    return cd;
+}