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Handle Zip archives that are "multi-part archives with only

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one part" by simply ignoring the marker at the beginning
of the file.  (Zip archivers reserve four bytes at the beginning
of each part of a multi-part archive, if it happens to only
require one part, those four bytes get filled with a placeholder
that can be ignored.)

Thanks to: Marius Nuennerich,
	 for pointing me to a Zip archive that libarchive couldn't handle
MFC after: 7 days
This commit is contained in:
Tim Kientzle 2008-01-15 16:27:15 +00:00
parent c50897c392
commit f432a1c5bc
1 changed files with 19 additions and 1 deletions
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20
lib/libarchive/archive_read_support_format_zip.c
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@ -180,7 +180,8 @@ archive_read_format_zip_bid(struct archive_read *a)
if ((p[2] == '\001' && p[3] == '\002')
|| (p[2] == '\003' && p[3] == '\004')
|| (p[2] == '\005' && p[3] == '\006')
|| (p[2] == '\007' && p[3] == '\010'))
|| (p[2] == '\007' && p[3] == '\010')
|| (p[2] == '0' && p[3] == '0'))
return (30);
}
return (0);
@ -214,6 +215,23 @@ archive_read_format_zip_read_header(struct archive_read *a,
return (ARCHIVE_FATAL);
}
/*
* "PK00" signature is used for "split" archives that
* only have a single segment. This means we can just
* skip the PK00; the first real file header should follow.
*/
if (signature[2] == '0' && signature[3] == '0') {
(a->decompressor->consume)(a, 4);
if ((h = __archive_read_ahead(a, 4)) == NULL)
return (ARCHIVE_FATAL);
signature = (const char *)h;
if (signature[0] != 'P' || signature[1] != 'K') {
archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
"Bad ZIP file");
return (ARCHIVE_FATAL);
}
}
if (signature[2] == '\001' && signature[3] == '\002') {
/* Beginning of central directory. */
return (ARCHIVE_EOF);