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git/archive-zip.c

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/*
* Copyright (c) 2006 Rene Scharfe
*/
#define USE_THE_REPOSITORY_VARIABLE
#include "git-compat-util.h"
#include "config.h"
#include "archive.h"
#include "gettext.h"
#include "git-zlib.h"
#include "hex.h"
#include "streaming.h"
#include "utf8.h"
#include "object-store-ll.h"
#include "strbuf.h"
#include "userdiff.h"
#include "write-or-die.h"
#include "xdiff-interface.h"
#include "date.h"
static int zip_date;
static int zip_time;
/* We only care about the "buf" part here. */
static struct strbuf zip_dir;
static uintmax_t zip_offset;
static uint64_t zip_dir_entries;
static unsigned int max_creator_version;
#define ZIP_STREAM (1 << 3)
#define ZIP_UTF8 (1 << 11)
enum zip_method {
ZIP_METHOD_STORE = 0,
ZIP_METHOD_DEFLATE = 8
};
struct zip_local_header {
unsigned char magic[4];
unsigned char version[2];
unsigned char flags[2];
unsigned char compression_method[2];
unsigned char mtime[2];
unsigned char mdate[2];
unsigned char crc32[4];
unsigned char compressed_size[4];
unsigned char size[4];
unsigned char filename_length[2];
unsigned char extra_length[2];
unsigned char _end[1];
};
struct zip_data_desc {
unsigned char magic[4];
unsigned char crc32[4];
unsigned char compressed_size[4];
unsigned char size[4];
unsigned char _end[1];
};
struct zip64_data_desc {
unsigned char magic[4];
unsigned char crc32[4];
unsigned char compressed_size[8];
unsigned char size[8];
unsigned char _end[1];
};
struct zip_dir_trailer {
unsigned char magic[4];
unsigned char disk[2];
unsigned char directory_start_disk[2];
unsigned char entries_on_this_disk[2];
unsigned char entries[2];
unsigned char size[4];
unsigned char offset[4];
unsigned char comment_length[2];
unsigned char _end[1];
};
struct zip_extra_mtime {
unsigned char magic[2];
unsigned char extra_size[2];
unsigned char flags[1];
unsigned char mtime[4];
unsigned char _end[1];
};
struct zip64_extra {
unsigned char magic[2];
unsigned char extra_size[2];
unsigned char size[8];
unsigned char compressed_size[8];
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
* we're interested in.
*/
#define ZIP_LOCAL_HEADER_SIZE offsetof(struct zip_local_header, _end)
#define ZIP_DATA_DESC_SIZE offsetof(struct zip_data_desc, _end)
#define ZIP64_DATA_DESC_SIZE offsetof(struct zip64_data_desc, _end)
#define ZIP_DIR_HEADER_SIZE offsetof(struct zip_dir_header, _end)
#define ZIP_DIR_TRAILER_SIZE offsetof(struct zip_dir_trailer, _end)
#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_EXTRA_SIZE offsetof(struct zip64_extra, _end)
#define ZIP64_EXTRA_PAYLOAD_SIZE \
(ZIP64_EXTRA_SIZE - offsetof(struct zip64_extra, size))
#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)
{
dest[0] = 0xff & n;
dest[1] = 0xff & (n >> 010);
}
static void copy_le32(unsigned char *dest, unsigned int n)
{
dest[0] = 0xff & n;
dest[1] = 0xff & (n >> 010);
dest[2] = 0xff & (n >> 020);
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 copy_le32_clamp(unsigned char *dest, uint64_t n, int *clamped)
{
copy_le32(dest, clamp_max(n, 0xffffffff, clamped));
}
static int strbuf_add_le(struct strbuf *sb, size_t size, uintmax_t n)
{
while (size-- > 0) {
strbuf_addch(sb, n & 0xff);
n >>= 8;
}
return -!!n;
}
static uint32_t clamp32(uintmax_t n)
{
const uintmax_t max = 0xffffffff;
return (n < max) ? n : max;
}
static void *zlib_deflate_raw(void *data, unsigned long size,
int compression_level,
unsigned long *compressed_size)
{
git_zstream stream;
unsigned long maxsize;
void *buffer;
int result;
git_deflate_init_raw(&stream, compression_level);
maxsize = git_deflate_bound(&stream, size);
buffer = xmalloc(maxsize);
stream.next_in = data;
stream.avail_in = size;
stream.next_out = buffer;
stream.avail_out = maxsize;
do {
result = git_deflate(&stream, Z_FINISH);
} while (result == Z_OK);
if (result != Z_STREAM_END) {
free(buffer);
return NULL;
}
git_deflate_end(&stream);
*compressed_size = stream.total_out;
return buffer;
}
static void write_zip_data_desc(unsigned long size,
unsigned long compressed_size,
unsigned long crc)
{
if (size >= 0xffffffff || compressed_size >= 0xffffffff) {
struct zip64_data_desc trailer;
copy_le32(trailer.magic, 0x08074b50);
copy_le32(trailer.crc32, crc);
copy_le64(trailer.compressed_size, compressed_size);
copy_le64(trailer.size, size);
write_or_die(1, &trailer, ZIP64_DATA_DESC_SIZE);
zip_offset += ZIP64_DATA_DESC_SIZE;
} else {
struct zip_data_desc trailer;
copy_le32(trailer.magic, 0x08074b50);
copy_le32(trailer.crc32, crc);
copy_le32(trailer.compressed_size, compressed_size);
copy_le32(trailer.size, size);
write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
zip_offset += ZIP_DATA_DESC_SIZE;
}
}
static void set_zip_header_data_desc(struct zip_local_header *header,
unsigned long size,
unsigned long compressed_size,
unsigned long crc)
{
copy_le32(header->crc32, crc);
copy_le32(header->compressed_size, compressed_size);
copy_le32(header->size, size);
}
static int has_only_ascii(const char *s)
{
for (;;) {
int c = *s++;
if (c == '\0')
return 1;
if (!isascii(c))
return 0;
}
}
static int entry_is_binary(struct index_state *istate, const char *path,
const void *buffer, size_t size)
{
struct userdiff_driver *driver = userdiff_find_by_path(istate, path);
if (!driver)
driver = userdiff_find_by_name("default");
if (driver->binary != -1)
return driver->binary;
return buffer_is_binary(buffer, size);
}
#define STREAM_BUFFER_SIZE (1024 * 16)
static int write_zip_entry(struct archiver_args *args,
const struct object_id *oid,
const char *path, size_t pathlen,
unsigned int mode,
void *buffer, unsigned long size)
{
struct zip_local_header header;
uintmax_t offset = zip_offset;
struct zip_extra_mtime extra;
struct zip64_extra extra64;
size_t header_extra_size = ZIP_EXTRA_MTIME_SIZE;
int need_zip64_extra = 0;
unsigned long attr2;
unsigned long compressed_size;
unsigned long crc;
enum zip_method method;
unsigned char *out;
void *deflated = NULL;
struct git_istream *stream = NULL;
unsigned long flags = 0;
int is_binary = -1;
const char *path_without_prefix = path + args->baselen;
unsigned int creator_version = 0;
unsigned int version_needed = 10;
size_t zip_dir_extra_size = ZIP_EXTRA_MTIME_SIZE;
size_t zip64_dir_extra_payload_size = 0;
crc = crc32(0, NULL, 0);
if (!has_only_ascii(path)) {
if (is_utf8(path))
flags |= ZIP_UTF8;
else
warning(_("path is not valid UTF-8: %s"), path);
}
if (pathlen > 0xffff) {
return error(_("path too long (%d chars, SHA1: %s): %s"),
(int)pathlen, oid_to_hex(oid), path);
}
if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
method = ZIP_METHOD_STORE;
attr2 = 16;
out = NULL;
compressed_size = 0;
} else if (S_ISREG(mode) || S_ISLNK(mode)) {
method = ZIP_METHOD_STORE;
attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
(mode & 0111) ? ((mode) << 16) : 0;
if (S_ISLNK(mode) || (mode & 0111))
creator_version = 0x0317;
if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
method = ZIP_METHOD_DEFLATE;
if (!buffer) {
enum object_type type;
stream = open_istream(args->repo, oid, &type, &size,
NULL);
if (!stream)
return error(_("cannot stream blob %s"),
oid_to_hex(oid));
flags |= ZIP_STREAM;
out = NULL;
} else {
crc = crc32(crc, buffer, size);
is_binary = entry_is_binary(args->repo->index,
path_without_prefix,
buffer, size);
out = buffer;
}
compressed_size = (method == ZIP_METHOD_STORE) ? size : 0;
} else {
return error(_("unsupported file mode: 0%o (SHA1: %s)"), mode,
oid_to_hex(oid));
}
if (creator_version > max_creator_version)
max_creator_version = creator_version;
if (buffer && method == ZIP_METHOD_DEFLATE) {
out = deflated = zlib_deflate_raw(buffer, size,
args->compression_level,
&compressed_size);
if (!out || compressed_size >= size) {
out = buffer;
method = ZIP_METHOD_STORE;
compressed_size = size;
}
}
copy_le16(extra.magic, 0x5455);
copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
extra.flags[0] = 1; /* just mtime */
copy_le32(extra.mtime, args->time);
if (size > 0xffffffff || compressed_size > 0xffffffff)
need_zip64_extra = 1;
if (stream && size > 0x7fffffff)
need_zip64_extra = 1;
if (need_zip64_extra)
version_needed = 45;
copy_le32(header.magic, 0x04034b50);
copy_le16(header.version, version_needed);
copy_le16(header.flags, flags);
copy_le16(header.compression_method, method);
copy_le16(header.mtime, zip_time);
copy_le16(header.mdate, zip_date);
if (need_zip64_extra) {
set_zip_header_data_desc(&header, 0xffffffff, 0xffffffff, crc);
header_extra_size += ZIP64_EXTRA_SIZE;
} else {
set_zip_header_data_desc(&header, size, compressed_size, crc);
}
copy_le16(header.filename_length, pathlen);
copy_le16(header.extra_length, header_extra_size);
write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
zip_offset += ZIP_LOCAL_HEADER_SIZE;
write_or_die(1, path, pathlen);
zip_offset += pathlen;
write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
zip_offset += ZIP_EXTRA_MTIME_SIZE;
if (need_zip64_extra) {
copy_le16(extra64.magic, 0x0001);
copy_le16(extra64.extra_size, ZIP64_EXTRA_PAYLOAD_SIZE);
copy_le64(extra64.size, size);
copy_le64(extra64.compressed_size, compressed_size);
write_or_die(1, &extra64, ZIP64_EXTRA_SIZE);
zip_offset += ZIP64_EXTRA_SIZE;
}
if (stream && method == ZIP_METHOD_STORE) {
unsigned char buf[STREAM_BUFFER_SIZE];
ssize_t readlen;
for (;;) {
readlen = read_istream(stream, buf, sizeof(buf));
if (readlen <= 0)
break;
crc = crc32(crc, buf, readlen);
if (is_binary == -1)
is_binary = entry_is_binary(args->repo->index,
path_without_prefix,
buf, readlen);
write_or_die(1, buf, readlen);
}
close_istream(stream);
if (readlen)
return readlen;
compressed_size = size;
zip_offset += compressed_size;
write_zip_data_desc(size, compressed_size, crc);
} else if (stream && method == ZIP_METHOD_DEFLATE) {
unsigned char buf[STREAM_BUFFER_SIZE];
ssize_t readlen;
git_zstream zstream;
int result;
size_t out_len;
unsigned char compressed[STREAM_BUFFER_SIZE * 2];
git_deflate_init_raw(&zstream, args->compression_level);
compressed_size = 0;
zstream.next_out = compressed;
zstream.avail_out = sizeof(compressed);
for (;;) {
readlen = read_istream(stream, buf, sizeof(buf));
if (readlen <= 0)
break;
crc = crc32(crc, buf, readlen);
if (is_binary == -1)
is_binary = entry_is_binary(args->repo->index,
path_without_prefix,
buf, readlen);
zstream.next_in = buf;
zstream.avail_in = readlen;
result = git_deflate(&zstream, 0);
if (result != Z_OK)
die(_("deflate error (%d)"), result);
out_len = zstream.next_out - compressed;
if (out_len > 0) {
write_or_die(1, compressed, out_len);
compressed_size += out_len;
zstream.next_out = compressed;
zstream.avail_out = sizeof(compressed);
}
}
close_istream(stream);
if (readlen)
return readlen;
zstream.next_in = buf;
zstream.avail_in = 0;
result = git_deflate(&zstream, Z_FINISH);
if (result != Z_STREAM_END)
die("deflate error (%d)", result);
git_deflate_end(&zstream);
out_len = zstream.next_out - compressed;
write_or_die(1, compressed, out_len);
compressed_size += out_len;
zip_offset += compressed_size;
write_zip_data_desc(size, compressed_size, crc);
} else if (compressed_size > 0) {
write_or_die(1, out, compressed_size);
zip_offset += compressed_size;
}
free(deflated);
if (compressed_size > 0xffffffff || size > 0xffffffff ||
offset > 0xffffffff) {
if (compressed_size >= 0xffffffff)
zip64_dir_extra_payload_size += 8;
if (size >= 0xffffffff)
zip64_dir_extra_payload_size += 8;
if (offset >= 0xffffffff)
zip64_dir_extra_payload_size += 8;
zip_dir_extra_size += 2 + 2 + zip64_dir_extra_payload_size;
}
strbuf_add_le(&zip_dir, 4, 0x02014b50); /* magic */
strbuf_add_le(&zip_dir, 2, creator_version);
strbuf_add_le(&zip_dir, 2, version_needed);
strbuf_add_le(&zip_dir, 2, flags);
strbuf_add_le(&zip_dir, 2, method);
strbuf_add_le(&zip_dir, 2, zip_time);
strbuf_add_le(&zip_dir, 2, zip_date);
strbuf_add_le(&zip_dir, 4, crc);
strbuf_add_le(&zip_dir, 4, clamp32(compressed_size));
strbuf_add_le(&zip_dir, 4, clamp32(size));
strbuf_add_le(&zip_dir, 2, pathlen);
strbuf_add_le(&zip_dir, 2, zip_dir_extra_size);
strbuf_add_le(&zip_dir, 2, 0); /* comment length */
strbuf_add_le(&zip_dir, 2, 0); /* disk */
strbuf_add_le(&zip_dir, 2, !is_binary);
strbuf_add_le(&zip_dir, 4, attr2);
strbuf_add_le(&zip_dir, 4, clamp32(offset));
strbuf_add(&zip_dir, path, pathlen);
strbuf_add(&zip_dir, &extra, ZIP_EXTRA_MTIME_SIZE);
if (zip64_dir_extra_payload_size) {
strbuf_add_le(&zip_dir, 2, 0x0001); /* magic */
strbuf_add_le(&zip_dir, 2, zip64_dir_extra_payload_size);
if (size >= 0xffffffff)
strbuf_add_le(&zip_dir, 8, size);
if (compressed_size >= 0xffffffff)
strbuf_add_le(&zip_dir, 8, compressed_size);
if (offset >= 0xffffffff)
strbuf_add_le(&zip_dir, 8, offset);
}
zip_dir_entries++;
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.len);
copy_le64(trailer64.offset, zip_offset);
copy_le32(locator64.magic, 0x07064b50);
copy_le32(locator64.disk, 0);
copy_le64(locator64.offset, zip_offset + zip_dir.len);
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 struct object_id *oid)
{
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_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.len);
copy_le32_clamp(trailer.offset, zip_offset, &clamped);
copy_le16(trailer.comment_length, oid ? the_hash_algo->hexsz : 0);
write_or_die(1, zip_dir.buf, zip_dir.len);
if (clamped)
write_zip64_trailer();
write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
if (oid)
write_or_die(1, oid_to_hex(oid), the_hash_algo->hexsz);
}
static void dos_time(timestamp_t *timestamp, int *dos_date, int *dos_time)
{
time_t time;
struct tm tm;
if (date_overflows(*timestamp))
die(_("timestamp too large for this system: %"PRItime),
*timestamp);
time = (time_t)*timestamp;
localtime_r(&time, &tm);
*timestamp = time;
*dos_date = tm.tm_mday + (tm.tm_mon + 1) * 32 +
(tm.tm_year + 1900 - 1980) * 512;
*dos_time = tm.tm_sec / 2 + tm.tm_min * 32 + tm.tm_hour * 2048;
}
static int archive_zip_config(const char *var, const char *value,
const struct config_context *ctx UNUSED,
void *data UNUSED)
{
return userdiff_config(var, value);
}
static int write_zip_archive(const struct archiver *ar UNUSED,
struct archiver_args *args)
{
int err;
git_config(archive_zip_config, NULL);
dos_time(&args->time, &zip_date, &zip_time);
strbuf_init(&zip_dir, 0);
err = write_archive_entries(args, write_zip_entry);
if (!err)
write_zip_trailer(args->commit_oid);
strbuf_release(&zip_dir);
return err;
}
static struct archiver zip_archiver = {
.name = "zip",
.write_archive = write_zip_archive,
.flags = ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE,
};
void init_zip_archiver(void)
{
register_archiver(&zip_archiver);
}
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