Support more than 65535 entries cleanly by writing a "zip64 end of central directory record" (with a 64-bit field for the number of entries) before the usual "end of central directory record" (which contains only a 16-bit field). InfoZIP's zip does the same. Archives with 65535 or less entries are not affected.
Programs that extract all files like InfoZIP's zip and 7-Zip ignored the field and could extract all files already. Software that relies on the ZIP file directory to show a list of contained files quickly to simulate to normal directory like Windows' built-in ZIP functionality only saw a subset of the included files. Windows supports ZIP64 since Vista according to https://en.wikipedia.org/wiki/Zip_%28file_format%29#ZIP64. Suggested-by: Johannes Schauer <jo...@debian.org> Signed-off-by: Rene Scharfe <l....@web.de> --- archive-zip.c | 93 +++++++++++++++++++++++++++++++++++++++-- t/t5004-archive-corner-cases.sh | 2 +- 2 files changed, 91 insertions(+), 4 deletions(-) diff --git a/archive-zip.c b/archive-zip.c index 2a76156..9db4735 100644 --- a/archive-zip.c +++ b/archive-zip.c @@ -16,7 +16,9 @@ static unsigned int zip_dir_size; static unsigned int zip_offset; static unsigned int zip_dir_offset; -static unsigned int zip_dir_entries; +static uint64_t zip_dir_entries; + +static unsigned int max_creator_version; #define ZIP_DIRECTORY_MIN_SIZE (1024 * 1024) #define ZIP_STREAM (1 << 3) @@ -86,6 +88,28 @@ struct zip_extra_mtime { unsigned char _end[1]; }; +struct zip64_dir_trailer { + unsigned char magic[4]; + unsigned char record_size[8]; + unsigned char creator_version[2]; + unsigned char version[2]; + unsigned char disk[4]; + unsigned char directory_start_disk[4]; + unsigned char entries_on_this_disk[8]; + unsigned char entries[8]; + unsigned char size[8]; + unsigned char offset[8]; + unsigned char _end[1]; +}; + +struct zip64_dir_trailer_locator { + unsigned char magic[4]; + unsigned char disk[4]; + unsigned char offset[8]; + unsigned char number_of_disks[4]; + unsigned char _end[1]; +}; + /* * On ARM, padding is added at the end of the struct, so a simple * sizeof(struct ...) reports two bytes more than the payload size @@ -98,6 +122,12 @@ struct zip_extra_mtime { #define ZIP_EXTRA_MTIME_SIZE offsetof(struct zip_extra_mtime, _end) #define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \ (ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags)) +#define ZIP64_DIR_TRAILER_SIZE offsetof(struct zip64_dir_trailer, _end) +#define ZIP64_DIR_TRAILER_RECORD_SIZE \ + (ZIP64_DIR_TRAILER_SIZE - \ + offsetof(struct zip64_dir_trailer, creator_version)) +#define ZIP64_DIR_TRAILER_LOCATOR_SIZE \ + offsetof(struct zip64_dir_trailer_locator, _end) static void copy_le16(unsigned char *dest, unsigned int n) { @@ -113,6 +143,31 @@ static void copy_le32(unsigned char *dest, unsigned int n) dest[3] = 0xff & (n >> 030); } +static void copy_le64(unsigned char *dest, uint64_t n) +{ + dest[0] = 0xff & n; + dest[1] = 0xff & (n >> 010); + dest[2] = 0xff & (n >> 020); + dest[3] = 0xff & (n >> 030); + dest[4] = 0xff & (n >> 040); + dest[5] = 0xff & (n >> 050); + dest[6] = 0xff & (n >> 060); + dest[7] = 0xff & (n >> 070); +} + +static uint64_t clamp_max(uint64_t n, uint64_t max, int *clamped) +{ + if (n <= max) + return n; + *clamped = 1; + return max; +} + +static void copy_le16_clamp(unsigned char *dest, uint64_t n, int *clamped) +{ + copy_le16(dest, clamp_max(n, 0xffff, clamped)); +} + static void *zlib_deflate_raw(void *data, unsigned long size, int compression_level, unsigned long *compressed_size) @@ -282,6 +337,9 @@ static int write_zip_entry(struct archiver_args *args, sha1_to_hex(sha1)); } + if (creator_version > max_creator_version) + max_creator_version = creator_version; + if (buffer && method == 8) { out = deflated = zlib_deflate_raw(buffer, size, args->compression_level, @@ -439,20 +497,49 @@ static int write_zip_entry(struct archiver_args *args, return 0; } +static void write_zip64_trailer(void) +{ + struct zip64_dir_trailer trailer64; + struct zip64_dir_trailer_locator locator64; + + copy_le32(trailer64.magic, 0x06064b50); + copy_le64(trailer64.record_size, ZIP64_DIR_TRAILER_RECORD_SIZE); + copy_le16(trailer64.creator_version, max_creator_version); + copy_le16(trailer64.version, 45); + copy_le32(trailer64.disk, 0); + copy_le32(trailer64.directory_start_disk, 0); + copy_le64(trailer64.entries_on_this_disk, zip_dir_entries); + copy_le64(trailer64.entries, zip_dir_entries); + copy_le64(trailer64.size, zip_dir_offset); + copy_le64(trailer64.offset, zip_offset); + + copy_le32(locator64.magic, 0x07064b50); + copy_le32(locator64.disk, 0); + copy_le64(locator64.offset, zip_offset + zip_dir_offset); + copy_le32(locator64.number_of_disks, 1); + + write_or_die(1, &trailer64, ZIP64_DIR_TRAILER_SIZE); + write_or_die(1, &locator64, ZIP64_DIR_TRAILER_LOCATOR_SIZE); +} + static void write_zip_trailer(const unsigned char *sha1) { struct zip_dir_trailer trailer; + int clamped = 0; copy_le32(trailer.magic, 0x06054b50); copy_le16(trailer.disk, 0); copy_le16(trailer.directory_start_disk, 0); - copy_le16(trailer.entries_on_this_disk, zip_dir_entries); - copy_le16(trailer.entries, zip_dir_entries); + copy_le16_clamp(trailer.entries_on_this_disk, zip_dir_entries, + &clamped); + copy_le16_clamp(trailer.entries, zip_dir_entries, &clamped); copy_le32(trailer.size, zip_dir_offset); copy_le32(trailer.offset, zip_offset); copy_le16(trailer.comment_length, sha1 ? GIT_SHA1_HEXSZ : 0); write_or_die(1, zip_dir, zip_dir_offset); + if (clamped) + write_zip64_trailer(); write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE); if (sha1) write_or_die(1, sha1_to_hex(sha1), GIT_SHA1_HEXSZ); diff --git a/t/t5004-archive-corner-cases.sh b/t/t5004-archive-corner-cases.sh index c6bd729..cca2338 100755 --- a/t/t5004-archive-corner-cases.sh +++ b/t/t5004-archive-corner-cases.sh @@ -122,7 +122,7 @@ test_lazy_prereq ZIPINFO ' test "x$n" = "x0" ' -test_expect_failure ZIPINFO 'zip archive with many entries' ' +test_expect_success ZIPINFO 'zip archive with many entries' ' # add a directory with 256 files mkdir 00 && for a in 0 1 2 3 4 5 6 7 8 9 a b c d e f -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
