From: "René Scharfe" <l.s.r@web.de>
To: Johannes Schauer <josch@debian.org>, git@vger.kernel.org
Cc: Junio C Hamano <gitster@pobox.com>
Subject: [PATCH 3/3] archive-zip: support more than 65535 entries
Date: Sat, 22 Aug 2015 21:06:45 +0200 [thread overview]
Message-ID: <55D8C845.3090908@web.de> (raw)
In-Reply-To: <20150813022545.30116.44787@localhost>
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 <josch@debian.org>
Signed-off-by: Rene Scharfe <l.s.r@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
next prev parent reply other threads:[~2015-08-22 19:07 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-11 10:40 bug: git-archive does not use the zip64 extension for archives with more than 16k entries Johannes Schauer
2015-08-12 19:40 ` René Scharfe
2015-08-13 2:25 ` Johannes Schauer
2015-08-22 19:06 ` [PATCH 1/3] t5004: test ZIP archives with many entries René Scharfe
2015-08-23 5:54 ` Eric Sunshine
2015-08-23 9:29 ` "René Scharfe"
2015-08-23 9:35 ` Eric Sunshine mail delivery failure René Scharfe
2015-08-23 17:16 ` Johannes Löthberg
2015-08-23 18:24 ` Eric Sunshine
[not found] ` <CA+EOSBmk2cdQe3owaXgkYAgTZqpUFa=J8g5FYq28-=VhDcJ4EA@mail.gmail.com>
2015-08-23 18:48 ` Eric Sunshine
2015-08-23 18:57 ` Eric Sunshine
2015-08-23 17:45 ` [PATCH 1/3] t5004: test ZIP archives with many entries Eric Sunshine
2015-08-28 15:45 ` Junio C Hamano
2015-08-28 15:57 ` Junio C Hamano
2015-08-28 16:47 ` Eric Sunshine
2015-08-22 19:06 ` [PATCH 2/3] archive-zip: use a local variable to store the creator version René Scharfe
2015-08-22 19:06 ` René Scharfe [this message]
2015-08-15 8:40 ` bug: git-archive does not use the zip64 extension for archives with more than 16k entries Duy Nguyen
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