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[GNUnet-SVN] r9797 - Extractor/src/plugins
|
From: |
gnunet |
|
Subject: |
[GNUnet-SVN] r9797 - Extractor/src/plugins |
|
Date: |
Fri, 18 Dec 2009 19:18:01 +0100 |
Author: grothoff
Date: 2009-12-18 19:18:01 +0100 (Fri, 18 Dec 2009)
New Revision: 9797
Added:
Extractor/src/plugins/zip_extractor.c
Removed:
Extractor/src/plugins/zipextractor.c
Modified:
Extractor/src/plugins/Makefile.am
Log:
zip
Modified: Extractor/src/plugins/Makefile.am
===================================================================
--- Extractor/src/plugins/Makefile.am 2009-12-18 18:08:20 UTC (rev 9796)
+++ Extractor/src/plugins/Makefile.am 2009-12-18 18:18:01 UTC (rev 9797)
@@ -90,7 +90,8 @@
libextractor_real.la \
$(rpm) \
$(thumbgtk) \
- libextractor_wav.la
+ libextractor_wav.la \
+ libextractor_zip.la
libextractor_applefile_la_SOURCES = \
applefile_extractor.c
@@ -260,6 +261,11 @@
libextractor_wav_la_LIBADD = \
$(LE_LIBINTL)
+libextractor_zip_la_SOURCES = \
+ zip_extractor.c
+libextractor_zip_la_LDFLAGS = \
+ $(PLUGINFLAGS)
+
EXTRA_DIST = template_extractor.c
@@ -339,13 +345,6 @@
libextractor_tiff_la_LIBADD = \
$(top_builddir)/src/common/libextractor_common.la
-libextractor_zip_la_SOURCES = \
- zipextractor.c
-libextractor_zip_la_LDFLAGS = \
- $(PLUGINFLAGS)
-libextractor_zip_la_LIBADD = \
- $(top_builddir)/src/main/libextractor.la
-
libextractor_riff_la_SOURCES = \
riffextractor.c
libextractor_riff_la_LDFLAGS = \
Copied: Extractor/src/plugins/zip_extractor.c (from rev 9791,
Extractor/src/plugins/zipextractor.c)
===================================================================
--- Extractor/src/plugins/zip_extractor.c (rev 0)
+++ Extractor/src/plugins/zip_extractor.c 2009-12-18 18:18:01 UTC (rev
9797)
@@ -0,0 +1,410 @@
+/**
+ zipextractor.c version 0.0.2
+
+ Changes from 0.0.1 to 0.0.2
+ -> Searches for central dir struct from end of file if this is a
self-extracting executable
+
+
+ This file was based on mp3extractor.c (0.1.2)
+
+ Currently, this only returns a list of the filenames within a zipfile
+ and any comments on each file or the whole file itself. File sizes,
+ modification times, and crc's are currently ignored.
+
+ TODO: Break the comments up into small, atomically, searchable chunks
(keywords)
+ - might need some knowledge of English?
+
+ It returns:
+
+ one EXTRACTOR_MIMETYPE
+ multiple EXTRACTOR_FILENAME
+ multiple EXTRACTOR_COMMENT
+
+ ... from a .ZIP file
+
+ TODO: EXTRACTOR_DATE, EXTRACTOR_DESCRIPTION, EXTRACTOR_KEYWORDS, others?
+
+ Does NOT test data integrity (CRCs etc.)
+
+ This version is not recursive (i.e. doesn't look inside zip
+ files within zip files)
+
+ TODO: Run extract on files inside of archive (?) (i.e. gif, mp3, etc.)
+
+ The current .ZIP format description:
+ ftp://ftp.pkware.com/appnote.zip
+
+ No Copyright 2003 Julia Wolf
+
+ */
+
+/*
+ * This file is part of libextractor.
+ * (C) 2002, 2003, 2009 Vidyut Samanta and Christian Grothoff
+ *
+ * libextractor is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2, or (at your
+ * option) any later version.
+ *
+ * libextractor is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with libextractor; see the file COPYING. If not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "platform.h"
+#include "extractor.h"
+
+#define DEBUG_EXTRACT_ZIP 0
+
+/* In a zipfile there are two kinds of comments. One is a big one for the
+ entire .zip, it's usually a BBS ad. The other is a small comment on each
+ individual file; most people don't use this.
+ */
+
+/* TODO: zip_entry linked list is handeled kinda messily, should clean up
(maybe) */
+ typedef struct
+{
+ char *filename;
+ char *comment;
+ void *next;
+ } zip_entry;
+
+/* mimetype = application/zip */
+int
+EXTRACTOR_zip_extract (const unsigned char *data,
+ size_t size,
+ EXTRACTOR_MetaDataProcessor proc,
+ void *proc_cls,
+ const char *options)
+{
+ int ret;
+ void *tmp;
+ zip_entry * info;
+ zip_entry * start;
+ char *filecomment = NULL;
+ const unsigned char *pos;
+ unsigned int offset, stop;
+ unsigned int name_length, extra_length, comment_length;
+ unsigned int filecomment_length;
+ unsigned int entry_total, entry_count;
+
+ /* I think the smallest zipfile you can have is about 120 bytes */
+ if ((NULL == data) || (size < 100))
+ return 0;
+ if (! (('P' == data[0]) && ('K' == data[1]) && (0x03 == data[2])
+ && (0x04 == data[3])))
+ return 0;
+
+ /* The filenames for each file in a zipfile are stored in two locations.
+ * There is one at the start of each entry, just before the compressed
data,
+ * and another at the end in a 'central directory structure'.
+ *
+ * In order to catch self-extracting executables, we scan backwards from
the end
+ * of the file looking for the central directory structure. The previous
version
+ * of this went forewards through the local headers, but that only works
for plain
+ * vanilla zip's and I don't feel like writing a special case for each of
the dozen
+ * self-extracting executable stubs.
+ *
+ * This assumes that the zip file is considered to be
non-corrupt/non-truncated.
+ * If it is truncated then it's not considered to be a zip and skipped.
+ *
+ */
+
+ /* From appnote.iz and appnote.txt (more or less)
+ *
+ * (this is why you always need to put in the last floppy if you span
disks)
+ *
+ * 0- 3 end of central dir signature 4 bytes (0x06054b50) P K ^E ^F
+ * 4- 5 number of this disk 2 bytes
+ * 6- 7 number of the disk with the
+ * start of the central directory 2 bytes
+ * 8- 9 total number of entries in
+ * the central dir on this disk 2 bytes
+ * 10-11 total number of entries in
+ * the central dir 2 bytes
+ * 12-15 size of the central directory 4 bytes
+ * 16-19 offset of start of central
+ * directory with respect to
+ * the starting disk number 4 bytes
+ * 20-21 zipfile comment length 2 bytes
+ * 22-?? zipfile comment (variable size) max length 65536 bytes
+ */
+
+ /* the signature can't be more than 22 bytes from the end */
+ offset = size - 22;
+ pos = &data[offset];
+ stop = 0;
+ if (((signed int) size - 65556) > 0)
+ stop = size - 65556;
+
+ /* not using int 0x06054b50 so that we don't have to deal with endianess
issues.
+ break out if we go more than 64K backwards and havn't found it, or if
we hit the
+ begining of the file. */
+ while ((!(('P' == pos[0]) && ('K' == pos[1]) && (0x05 == pos[2])
+ && (0x06 == pos[3]))) && (offset > stop))
+ pos = &data[offset--];
+ if (offset == stop)
+ {
+
+#if DEBUG_EXTRACT_ZIP
+ fprintf (stderr,
+ "Did not find end of central directory structure signature.
offset: %i\n",
+ offset);
+
+#endif /* */
+ return 0;
+ }
+
+ /* offset should now point to the start of the end-of-central directory
structure */
+ /* and pos[0] should be pointing there too */
+ /* so slurp down filecomment while here... */
+ filecomment_length = pos[20] + (pos[21] << 8);
+ if (filecomment_length + offset + 22 > size)
+ {
+ return 0; /* invalid zip file format! */
+ }
+ filecomment = NULL;
+ if (filecomment_length > 0)
+ {
+ filecomment = malloc (filecomment_length + 1);
+ memcpy (filecomment, &pos[22], filecomment_length);
+ filecomment[filecomment_length] = '\0';
+ }
+ if ((0 != pos[4]) && (0 != pos[5]))
+ {
+
+#if DEBUG_EXTRACT_ZIP
+ fprintf (stderr,
+ "WARNING: This seems to be the last disk in a multi-volume"
+ " ZIP archive, and so this might not work.\n");
+
+#endif /* */
+ }
+ if ((pos[8] != pos[10]) && (pos[9] != pos[11]))
+ {
+
+#if DEBUG_EXTRACT_ZIP
+ fprintf (stderr,
+ "WARNING: May not be able to find all the files in this"
+ " ZIP archive (no multi-volume support right now).\n");
+
+#endif /* */
+ }
+ entry_total = pos[10] + (pos[11] << 8);
+ entry_count = 0;
+
+ /* jump to start of central directory, ASSUMING that the starting disk
that it's on is disk 0 */
+ /* starting disk would otherwise be pos[6]+pos[7]<<8 */
+ offset = pos[16] + (pos[17] << 8) + (pos[18] << 16) + (pos[19] << 24);
/* offset of cent-dir from start of disk 0 */
+
+ /* stop = pos[12] + (pos[13]<<8) + (pos[14]<<16) + (pos[15]<<24); *//*
length of central dir */
+ if (offset + 46 > size)
+ {
+
+ /* not a zip */
+ if (filecomment != NULL)
+ free (filecomment);
+ return 0;
+ }
+ pos = &data[offset]; /* jump */
+
+ /* we should now be at the begining of the central directory structure */
+
+ /* from appnote.txt and appnote.iz (mostly)
+ *
+ * 0- 3 central file header signature 4 bytes (0x02014b50)
+ * 4- 5 version made by 2 bytes
+ * 6- 7 version needed to extract 2 bytes
+ * 8- 9 general purpose bit flag 2 bytes
+ * 10-11 compression method 2 bytes
+ * 12-13 last mod file time 2 bytes
+ * 14-15 last mod file date 2 bytes
+ * 16-19 crc-32 4 bytes
+ * 20-23 compressed size 4 bytes
+ * 24-27 uncompressed size 4 bytes
+ * 28-29 filename length 2 bytes
+ * 30-31 extra field length 2 bytes
+ * 32-33 file comment length 2 bytes
+ * 34-35 disk number start 2 bytes
+ * 36-37 internal file attributes 2 bytes
+ * 38-41 external file attributes 4 bytes
+ * 42-45 relative offset of local header 4 bytes
+ *
+ * 46-?? filename (variable size)
+ * ?- ? extra field (variable size)
+ * ?- ? file comment (variable size)
+ */
+ if (!(('P' == pos[0]) && ('K' == pos[1]) && (0x01 == pos[2])
+ && (0x02 == pos[3])))
+ {
+
+#if DEBUG_EXTRACT_ZIP
+ fprintf (stderr,
+ "Did not find central directory structure signature. offset:
%i\n",
+ offset);
+
+#endif
+ if (filecomment != NULL)
+ free (filecomment);
+ return 0;
+ }
+ start = NULL;
+ info = NULL;
+
+ do
+ { /* while ( (0x01==pos[2])&&(0x02==pos[3]) ) */
+ entry_count++; /* check to make sure we found everything at
the end */
+ name_length = pos[28] + (pos[29] << 8);
+ extra_length = pos[30] + (pos[31] << 8);
+ comment_length = pos[32] + (pos[33] << 8);
+ if (name_length + extra_length + comment_length + offset + 46 > size)
+ {
+
+ /* ok, invalid, abort! */
+ break;
+ }
+
+#if DEBUG_EXTRACT_ZIP
+ fprintf (stderr, "Found filename length %i Comment length: %i\n",
+ name_length, comment_length);
+
+#endif /* */
+
+ /* yay, finally get filenames */
+ if (start == NULL)
+ {
+ start = malloc (sizeof (zip_entry));
+ start->next = NULL;
+ info = start;
+ }
+ else
+ {
+ info->next = malloc (sizeof (zip_entry));
+ info = info->next;
+ info->next = NULL;
+ }
+ info->filename = malloc (name_length + 1);
+ info->comment = malloc (comment_length + 1);
+
+ /* (strings in zip files are not null terminated) */
+ memcpy (info->filename, &pos[46], name_length);
+ info->filename[name_length] = '\0';
+ memcpy (info->comment, &pos[46 + name_length + extra_length],
+ comment_length);
+ info->comment[comment_length] = '\0';
+
+#if DEBUG_EXTRACT_ZIP
+ fprintf (stderr, "Found file %s, Comment: %s\n", info->filename,
+ info->comment);
+
+#endif
+ offset += 46 + name_length + extra_length + comment_length;
+ pos = &data[offset];
+
+ /* check for next header entry (0x02014b50) or (0x06054b50) if at end
*/
+ if (('P' != pos[0]) && ('K' != pos[1]))
+ {
+
+#if DEBUG_EXTRACT_ZIP
+ fprintf (stderr,
+ "Did not find next header in central directory.\n");
+
+#endif
+ info = start;
+ while (info != NULL)
+ {
+ start = info->next;
+ free (info->filename);
+ free (info->comment);
+ free (info);
+ info = start;
+ }
+ if (filecomment != NULL)
+ free (filecomment);
+ return 0;
+ }
+ }
+ while ((0x01 == pos[2]) && (0x02 == pos[3]));
+
+ /* end list */
+
+ /* TODO: should this return an error? indicates corrupt zipfile (or
+ disk missing in middle of multi-disk)? */
+ if (entry_count != entry_total)
+ {
+
+#if DEBUG_EXTRACT_ZIP
+ fprintf (stderr,
+ "WARNING: Did not find all of the zipfile entries that we
should have.\n");
+
+#endif /* */
+ }
+
+ ret = proc (proc_cls,
+ "zip",
+ EXTRACTOR_METATYPE_MIMETYPE,
+ EXTRACTOR_METAFORMAT_UTF8,
+ "text/plain",
+ "application/zip",
+ strlen ("application/zip")+1);
+ if ( (filecomment != NULL) && (ret != 0) )
+ {
+ ret = proc (proc_cls,
+ "zip",
+ EXTRACTOR_METATYPE_MIMETYPE,
+ EXTRACTOR_METAFORMAT_UTF8,
+ "text/plain",
+ filecomment,
+ strlen (filecomment)+1);
+ }
+ free (filecomment);
+
+
+ /* if we've gotten to here then there is at least one zip entry (see
get_zipinfo call above) */
+ /* note: this free()'s the info list as it goes */
+ info = start;
+ while (NULL != info)
+ {
+ if (info->filename != NULL)
+ {
+ if ( (ret == 0) && (strlen (info->filename)) )
+ {
+ ret = proc (proc_cls,
+ "zip",
+ EXTRACTOR_METATYPE_FILENAME,
+ EXTRACTOR_METAFORMAT_UTF8,
+ "text/plain",
+ info->filename,
+ strlen (info->filename)+1);
+ }
+ }
+ if (info->comment != NULL)
+ {
+ if ( (ret == 0) && (strlen (info->comment) > 0) )
+ {
+ ret = proc (proc_cls,
+ "zip",
+ EXTRACTOR_METATYPE_FILENAME,
+ EXTRACTOR_METAFORMAT_UTF8,
+ "text/plain",
+ info->comment,
+ strlen (info->comment)+1);
+ }
+ }
+ free (info->filename);
+ free (info->comment);
+ tmp = info;
+ info = info->next;
+ free (tmp);
+ }
+ return ret;
+}
+
+
Deleted: Extractor/src/plugins/zipextractor.c
===================================================================
--- Extractor/src/plugins/zipextractor.c 2009-12-18 18:08:20 UTC (rev
9796)
+++ Extractor/src/plugins/zipextractor.c 2009-12-18 18:18:01 UTC (rev
9797)
@@ -1,417 +0,0 @@
-/**
- zipextractor.c version 0.0.2
-
- Changes from 0.0.1 to 0.0.2
- -> Searches for central dir struct from end of file if this is a
self-extracting executable
-
-
- This file was based on mp3extractor.c (0.1.2)
-
- Currently, this only returns a list of the filenames within a zipfile
- and any comments on each file or the whole file itself. File sizes,
- modification times, and crc's are currently ignored.
-
- TODO: Break the comments up into small, atomically, searchable chunks
(keywords)
- - might need some knowledge of English?
-
- It returns:
-
- one EXTRACTOR_MIMETYPE
- multiple EXTRACTOR_FILENAME
- multiple EXTRACTOR_COMMENT
-
- ... from a .ZIP file
-
- TODO: EXTRACTOR_DATE, EXTRACTOR_DESCRIPTION, EXTRACTOR_KEYWORDS, others?
-
- Does NOT test data integrity (CRCs etc.)
-
- This version is not recursive (i.e. doesn't look inside zip
- files within zip files)
-
- TODO: Run extract on files inside of archive (?) (i.e. gif, mp3, etc.)
-
- The current .ZIP format description:
- ftp://ftp.pkware.com/appnote.zip
-
- No Copyright 2003 Julia Wolf
-
- */
-
-/*
- * This file is part of libextractor.
- * (C) 2002, 2003 Vidyut Samanta and Christian Grothoff
- *
- * libextractor is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published
- * by the Free Software Foundation; either version 2, or (at your
- * option) any later version.
- *
- * libextractor is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with libextractor; see the file COPYING. If not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
- */
-
-#include "platform.h"
-#include "extractor.h"
-
-#define DEBUG_EXTRACT_ZIP 0
-
-/* In a zipfile there are two kinds of comments. One is a big one for the
- entire .zip, it's usually a BBS ad. The other is a small comment on each
- individual file; most people don't use this.
- */
-
-/* TODO: zip_entry linked list is handeled kinda messily, should clean up
(maybe) */
- typedef struct
-{
- char *filename;
- char *comment;
- void *next;
- } zip_entry;
-
-/* mimetype = application/zip */
-struct EXTRACTOR_Keywords *
-libextractor_zip_extract (const char *filename, const unsigned char *data,
- size_t size, struct EXTRACTOR_Keywords *prev)
-{
- void *tmp;
- zip_entry * info;
- zip_entry * start;
- char *filecomment = NULL;
- const unsigned char *pos;
- unsigned int offset, stop;
- unsigned int name_length, extra_length, comment_length;
- unsigned int filecomment_length;
- unsigned int entry_total, entry_count;
- EXTRACTOR_KeywordList * keyword;
- const char *mimetype;
- mimetype = EXTRACTOR_extractLast (EXTRACTOR_MIMETYPE, prev);
- if (NULL != mimetype)
- {
- if ((0 != strcmp (mimetype, "application/x-zip")) &&
- (0 != strcmp (mimetype, "application/zip")))
- {
-
- /* we think we already know what's in here,
- and it is not a zip */
- return prev;
- }
- }
-
- /* I think the smallest zipfile you can have is about 120 bytes */
- if ((NULL == data) || (size < 100))
- return prev;
- if (!
- (('P' == data[0]) && ('K' == data[1]) && (0x03 == data[2])
- && (0x04 == data[3])))
- return prev;
-
- /* The filenames for each file in a zipfile are stored in two locations.
- * There is one at the start of each entry, just before the compressed
data,
- * and another at the end in a 'central directory structure'.
- *
- * In order to catch self-extracting executables, we scan backwards from
the end
- * of the file looking for the central directory structure. The previous
version
- * of this went forewards through the local headers, but that only works
for plain
- * vanilla zip's and I don't feel like writing a special case for each of
the dozen
- * self-extracting executable stubs.
- *
- * This assumes that the zip file is considered to be
non-corrupt/non-truncated.
- * If it is truncated then it's not considered to be a zip and skipped.
- *
- */
-
- /* From appnote.iz and appnote.txt (more or less)
- *
- * (this is why you always need to put in the last floppy if you span
disks)
- *
- * 0- 3 end of central dir signature 4 bytes (0x06054b50) P K ^E ^F
- * 4- 5 number of this disk 2 bytes
- * 6- 7 number of the disk with the
- * start of the central directory 2 bytes
- * 8- 9 total number of entries in
- * the central dir on this disk 2 bytes
- * 10-11 total number of entries in
- * the central dir 2 bytes
- * 12-15 size of the central directory 4 bytes
- * 16-19 offset of start of central
- * directory with respect to
- * the starting disk number 4 bytes
- * 20-21 zipfile comment length 2 bytes
- * 22-?? zipfile comment (variable size) max length 65536 bytes
- */
-
- /* the signature can't be more than 22 bytes from the end */
- offset = size - 22;
- pos = &data[offset];
- stop = 0;
- if (((signed int) size - 65556) > 0)
- stop = size - 65556;
-
- /* not using int 0x06054b50 so that we don't have to deal with endianess
issues.
- break out if we go more than 64K backwards and havn't found it, or if
we hit the
- begining of the file. */
- while ((!
- (('P' == pos[0]) && ('K' == pos[1]) && (0x05 == pos[2])
- && (0x06 == pos[3]))) && (offset > stop))
- pos = &data[offset--];
- if (offset == stop)
- {
-
-#if DEBUG_EXTRACT_ZIP
- fprintf (stderr,
- "Did not find end of central directory structure signature.
offset: %i\n",
- offset);
-
-#endif /* */
- return prev;
- }
-
- /* offset should now point to the start of the end-of-central directory
structure */
- /* and pos[0] should be pointing there too */
- /* so slurp down filecomment while here... */
- filecomment_length = pos[20] + (pos[21] << 8);
- if (filecomment_length + offset + 22 > size)
- {
- return prev; /* invalid zip file format! */
- }
- filecomment = NULL;
- if (filecomment_length > 0)
- {
- filecomment = malloc (filecomment_length + 1);
- memcpy (filecomment, &pos[22], filecomment_length);
- filecomment[filecomment_length] = '\0';
- }
- if ((0 != pos[4]) && (0 != pos[5]))
- {
-
-#if DEBUG_EXTRACT_ZIP
- fprintf (stderr,
- "WARNING: This seems to be the last disk in a multi-volume"
- " ZIP archive, and so this might not work.\n");
-
-#endif /* */
- }
- if ((pos[8] != pos[10]) && (pos[9] != pos[11]))
- {
-
-#if DEBUG_EXTRACT_ZIP
- fprintf (stderr,
- "WARNING: May not be able to find all the files in this"
- " ZIP archive (no multi-volume support right now).\n");
-
-#endif /* */
- }
- entry_total = pos[10] + (pos[11] << 8);
- entry_count = 0;
-
- /* jump to start of central directory, ASSUMING that the starting disk
that it's on is disk 0 */
- /* starting disk would otherwise be pos[6]+pos[7]<<8 */
- offset = pos[16] + (pos[17] << 8) + (pos[18] << 16) + (pos[19] << 24);
/* offset of cent-dir from start of disk 0 */
-
- /* stop = pos[12] + (pos[13]<<8) + (pos[14]<<16) + (pos[15]<<24); *//*
length of central dir */
- if (offset + 46 > size)
- {
-
- /* not a zip */
- if (filecomment != NULL)
- free (filecomment);
- return prev;
- }
- pos = &data[offset]; /* jump */
-
- /* we should now be at the begining of the central directory structure */
-
- /* from appnote.txt and appnote.iz (mostly)
- *
- * 0- 3 central file header signature 4 bytes (0x02014b50)
- * 4- 5 version made by 2 bytes
- * 6- 7 version needed to extract 2 bytes
- * 8- 9 general purpose bit flag 2 bytes
- * 10-11 compression method 2 bytes
- * 12-13 last mod file time 2 bytes
- * 14-15 last mod file date 2 bytes
- * 16-19 crc-32 4 bytes
- * 20-23 compressed size 4 bytes
- * 24-27 uncompressed size 4 bytes
- * 28-29 filename length 2 bytes
- * 30-31 extra field length 2 bytes
- * 32-33 file comment length 2 bytes
- * 34-35 disk number start 2 bytes
- * 36-37 internal file attributes 2 bytes
- * 38-41 external file attributes 4 bytes
- * 42-45 relative offset of local header 4 bytes
- *
- * 46-?? filename (variable size)
- * ?- ? extra field (variable size)
- * ?- ? file comment (variable size)
- */
- if (!
- (('P' == pos[0]) && ('K' == pos[1]) && (0x01 == pos[2])
- && (0x02 == pos[3])))
- {
-
-#if DEBUG_EXTRACT_ZIP
- fprintf (stderr,
- "Did not find central directory structure signature. offset:
%i\n",
- offset);
-
-#endif /* */
- if (filecomment != NULL)
- free (filecomment);
- return prev;
- }
- start = NULL;
- info = NULL;
-
- do
- { /* while ( (0x01==pos[2])&&(0x02==pos[3]) ) */
- entry_count++; /* check to make sure we found everything at
the end */
- name_length = pos[28] + (pos[29] << 8);
- extra_length = pos[30] + (pos[31] << 8);
- comment_length = pos[32] + (pos[33] << 8);
- if (name_length + extra_length + comment_length + offset + 46 > size)
- {
-
- /* ok, invalid, abort! */
- break;
- }
-
-#if DEBUG_EXTRACT_ZIP
- fprintf (stderr, "Found filename length %i Comment length: %i\n",
- name_length, comment_length);
-
-#endif /* */
-
- /* yay, finally get filenames */
- if (start == NULL)
- {
- start = malloc (sizeof (zip_entry));
- start->next = NULL;
- info = start;
- }
- else
- {
- info->next = malloc (sizeof (zip_entry));
- info = info->next;
- info->next = NULL;
- }
- info->filename = malloc (name_length + 1);
- info->comment = malloc (comment_length + 1);
-
- /* (strings in zip files are not null terminated) */
- memcpy (info->filename, &pos[46], name_length);
- info->filename[name_length] = '\0';
- memcpy (info->comment, &pos[46 + name_length + extra_length],
- comment_length);
- info->comment[comment_length] = '\0';
-
-#if DEBUG_EXTRACT_ZIP
- fprintf (stderr, "Found file %s, Comment: %s\n", info->filename,
- info->comment);
-
-#endif
- offset += 46 + name_length + extra_length + comment_length;
- pos = &data[offset];
-
- /* check for next header entry (0x02014b50) or (0x06054b50) if at end
*/
- if (('P' != pos[0]) && ('K' != pos[1]))
- {
-
-#if DEBUG_EXTRACT_ZIP
- fprintf (stderr,
- "Did not find next header in central directory.\n");
-
-#endif
- info = start;
- while (info != NULL)
- {
- start = info->next;
- free (info->filename);
- free (info->comment);
- free (info);
- info = start;
- }
- if (filecomment != NULL)
- free (filecomment);
- return prev;
- }
- }
- while ((0x01 == pos[2]) && (0x02 == pos[3]));
-
- /* end list */
-
- /* TODO: should this return an error? indicates corrupt zipfile (or
- disk missing in middle of multi-disk)? */
- if (entry_count != entry_total)
- {
-
-#if DEBUG_EXTRACT_ZIP
- fprintf (stderr,
- "WARNING: Did not find all of the zipfile entries that we
should have.\n");
-
-#endif /* */
- }
-
- /* I'm only putting this in the else clause so that keyword has a local
scope */
- keyword = malloc (sizeof (EXTRACTOR_KeywordList));
- keyword->next = prev;
- keyword->keyword = strdup ("application/zip");
- keyword->keywordType = EXTRACTOR_MIMETYPE;
- prev = keyword;
- if (filecomment != NULL)
- {
- EXTRACTOR_KeywordList * kw = malloc (sizeof (EXTRACTOR_KeywordList));
- kw->next = prev;
- kw->keyword = strdup (filecomment);
- kw->keywordType = EXTRACTOR_COMMENT;
- prev = kw;
- free (filecomment);
- }
-
- /* if we've gotten to here then there is at least one zip entry (see
get_zipinfo call above) */
- /* note: this free()'s the info list as it goes */
- info = start;
- while (NULL != info)
- {
- if (info->filename != NULL)
- {
- if (strlen (info->filename))
- {
- EXTRACTOR_KeywordList * keyword =
- malloc (sizeof (EXTRACTOR_KeywordList));
- keyword->next = prev;
- keyword->keyword = strdup (info->filename);
- keyword->keywordType = EXTRACTOR_FILENAME;
- prev = keyword;
- }
- free (info->filename);
- }
- if (info->comment != NULL)
- {
- if (strlen (info->comment) > 0)
- {
- EXTRACTOR_KeywordList * keyword =
- malloc (sizeof (EXTRACTOR_KeywordList));
- keyword->next = prev;
- keyword->keyword = strdup (info->comment);
- keyword->keywordType = EXTRACTOR_COMMENT;
- prev = keyword;
- }
- free (info->comment);
- }
- tmp = info;
- info = info->next;
- free (tmp);
- }
- return prev;
-}
-
-
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