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![Matheus Tavares](/assets/img/avatar_default.png)
Some callers of open_istream() at archive-tar.c and archive-zip.c are capable of working on arbitrary repositories but the repo struct is not passed down to open_istream(), which uses the_repository internally. For now, that's not a problem since the said callers are only being called with the_repository. But to be consistent and avoid future problems, let's allow open_istream() to receive a struct repository and use that instead of the_repository. This parameter addition will also be used in a future patch to make sha1-file.c:check_object_signature() be able to work on arbitrary repos. Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br> Signed-off-by: Junio C Hamano <gitster@pobox.com>
661 lines
17 KiB
C
661 lines
17 KiB
C
/*
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* Copyright (c) 2006 Rene Scharfe
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*/
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#include "cache.h"
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#include "config.h"
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#include "archive.h"
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#include "streaming.h"
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#include "utf8.h"
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#include "object-store.h"
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#include "userdiff.h"
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#include "xdiff-interface.h"
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static int zip_date;
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static int zip_time;
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/* We only care about the "buf" part here. */
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static struct strbuf zip_dir;
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static uintmax_t zip_offset;
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static uint64_t zip_dir_entries;
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static unsigned int max_creator_version;
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#define ZIP_STREAM (1 << 3)
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#define ZIP_UTF8 (1 << 11)
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enum zip_method {
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ZIP_METHOD_STORE = 0,
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ZIP_METHOD_DEFLATE = 8
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};
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struct zip_local_header {
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unsigned char magic[4];
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unsigned char version[2];
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unsigned char flags[2];
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unsigned char compression_method[2];
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unsigned char mtime[2];
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unsigned char mdate[2];
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unsigned char crc32[4];
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unsigned char compressed_size[4];
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unsigned char size[4];
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unsigned char filename_length[2];
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unsigned char extra_length[2];
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unsigned char _end[1];
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};
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struct zip_data_desc {
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unsigned char magic[4];
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unsigned char crc32[4];
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unsigned char compressed_size[4];
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unsigned char size[4];
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unsigned char _end[1];
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};
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struct zip64_data_desc {
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unsigned char magic[4];
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unsigned char crc32[4];
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unsigned char compressed_size[8];
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unsigned char size[8];
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unsigned char _end[1];
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};
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struct zip_dir_trailer {
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unsigned char magic[4];
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unsigned char disk[2];
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unsigned char directory_start_disk[2];
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unsigned char entries_on_this_disk[2];
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unsigned char entries[2];
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unsigned char size[4];
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unsigned char offset[4];
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unsigned char comment_length[2];
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unsigned char _end[1];
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};
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struct zip_extra_mtime {
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unsigned char magic[2];
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unsigned char extra_size[2];
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unsigned char flags[1];
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unsigned char mtime[4];
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unsigned char _end[1];
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};
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struct zip64_extra {
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unsigned char magic[2];
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unsigned char extra_size[2];
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unsigned char size[8];
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unsigned char compressed_size[8];
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unsigned char _end[1];
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};
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struct zip64_dir_trailer {
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unsigned char magic[4];
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unsigned char record_size[8];
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unsigned char creator_version[2];
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unsigned char version[2];
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unsigned char disk[4];
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unsigned char directory_start_disk[4];
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unsigned char entries_on_this_disk[8];
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unsigned char entries[8];
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unsigned char size[8];
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unsigned char offset[8];
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unsigned char _end[1];
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};
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struct zip64_dir_trailer_locator {
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unsigned char magic[4];
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unsigned char disk[4];
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unsigned char offset[8];
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unsigned char number_of_disks[4];
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unsigned char _end[1];
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};
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/*
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* On ARM, padding is added at the end of the struct, so a simple
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* sizeof(struct ...) reports two bytes more than the payload size
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* we're interested in.
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*/
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#define ZIP_LOCAL_HEADER_SIZE offsetof(struct zip_local_header, _end)
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#define ZIP_DATA_DESC_SIZE offsetof(struct zip_data_desc, _end)
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#define ZIP64_DATA_DESC_SIZE offsetof(struct zip64_data_desc, _end)
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#define ZIP_DIR_HEADER_SIZE offsetof(struct zip_dir_header, _end)
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#define ZIP_DIR_TRAILER_SIZE offsetof(struct zip_dir_trailer, _end)
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#define ZIP_EXTRA_MTIME_SIZE offsetof(struct zip_extra_mtime, _end)
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#define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
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(ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
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#define ZIP64_EXTRA_SIZE offsetof(struct zip64_extra, _end)
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#define ZIP64_EXTRA_PAYLOAD_SIZE \
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(ZIP64_EXTRA_SIZE - offsetof(struct zip64_extra, size))
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#define ZIP64_DIR_TRAILER_SIZE offsetof(struct zip64_dir_trailer, _end)
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#define ZIP64_DIR_TRAILER_RECORD_SIZE \
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(ZIP64_DIR_TRAILER_SIZE - \
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offsetof(struct zip64_dir_trailer, creator_version))
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#define ZIP64_DIR_TRAILER_LOCATOR_SIZE \
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offsetof(struct zip64_dir_trailer_locator, _end)
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static void copy_le16(unsigned char *dest, unsigned int n)
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{
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dest[0] = 0xff & n;
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dest[1] = 0xff & (n >> 010);
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}
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static void copy_le32(unsigned char *dest, unsigned int n)
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{
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dest[0] = 0xff & n;
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dest[1] = 0xff & (n >> 010);
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dest[2] = 0xff & (n >> 020);
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dest[3] = 0xff & (n >> 030);
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}
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static void copy_le64(unsigned char *dest, uint64_t n)
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{
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dest[0] = 0xff & n;
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dest[1] = 0xff & (n >> 010);
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dest[2] = 0xff & (n >> 020);
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dest[3] = 0xff & (n >> 030);
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dest[4] = 0xff & (n >> 040);
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dest[5] = 0xff & (n >> 050);
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dest[6] = 0xff & (n >> 060);
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dest[7] = 0xff & (n >> 070);
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}
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static uint64_t clamp_max(uint64_t n, uint64_t max, int *clamped)
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{
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if (n <= max)
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return n;
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*clamped = 1;
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return max;
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}
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static void copy_le16_clamp(unsigned char *dest, uint64_t n, int *clamped)
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{
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copy_le16(dest, clamp_max(n, 0xffff, clamped));
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}
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static void copy_le32_clamp(unsigned char *dest, uint64_t n, int *clamped)
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{
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copy_le32(dest, clamp_max(n, 0xffffffff, clamped));
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}
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static int strbuf_add_le(struct strbuf *sb, size_t size, uintmax_t n)
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{
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while (size-- > 0) {
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strbuf_addch(sb, n & 0xff);
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n >>= 8;
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}
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return -!!n;
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}
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static uint32_t clamp32(uintmax_t n)
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{
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const uintmax_t max = 0xffffffff;
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return (n < max) ? n : max;
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}
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static void *zlib_deflate_raw(void *data, unsigned long size,
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int compression_level,
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unsigned long *compressed_size)
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{
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git_zstream stream;
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unsigned long maxsize;
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void *buffer;
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int result;
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git_deflate_init_raw(&stream, compression_level);
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maxsize = git_deflate_bound(&stream, size);
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buffer = xmalloc(maxsize);
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stream.next_in = data;
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stream.avail_in = size;
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stream.next_out = buffer;
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stream.avail_out = maxsize;
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do {
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result = git_deflate(&stream, Z_FINISH);
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} while (result == Z_OK);
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if (result != Z_STREAM_END) {
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free(buffer);
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return NULL;
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}
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git_deflate_end(&stream);
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*compressed_size = stream.total_out;
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return buffer;
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}
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static void write_zip_data_desc(unsigned long size,
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unsigned long compressed_size,
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unsigned long crc)
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{
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if (size >= 0xffffffff || compressed_size >= 0xffffffff) {
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struct zip64_data_desc trailer;
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copy_le32(trailer.magic, 0x08074b50);
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copy_le32(trailer.crc32, crc);
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copy_le64(trailer.compressed_size, compressed_size);
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copy_le64(trailer.size, size);
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write_or_die(1, &trailer, ZIP64_DATA_DESC_SIZE);
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zip_offset += ZIP64_DATA_DESC_SIZE;
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} else {
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struct zip_data_desc trailer;
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copy_le32(trailer.magic, 0x08074b50);
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copy_le32(trailer.crc32, crc);
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copy_le32(trailer.compressed_size, compressed_size);
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copy_le32(trailer.size, size);
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write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
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zip_offset += ZIP_DATA_DESC_SIZE;
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}
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}
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static void set_zip_header_data_desc(struct zip_local_header *header,
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unsigned long size,
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unsigned long compressed_size,
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unsigned long crc)
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{
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copy_le32(header->crc32, crc);
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copy_le32(header->compressed_size, compressed_size);
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copy_le32(header->size, size);
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}
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static int has_only_ascii(const char *s)
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{
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for (;;) {
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int c = *s++;
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if (c == '\0')
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return 1;
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if (!isascii(c))
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return 0;
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}
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}
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static int entry_is_binary(struct index_state *istate, const char *path,
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const void *buffer, size_t size)
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{
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struct userdiff_driver *driver = userdiff_find_by_path(istate, path);
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if (!driver)
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driver = userdiff_find_by_name("default");
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if (driver->binary != -1)
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return driver->binary;
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return buffer_is_binary(buffer, size);
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}
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#define STREAM_BUFFER_SIZE (1024 * 16)
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static int write_zip_entry(struct archiver_args *args,
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const struct object_id *oid,
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const char *path, size_t pathlen,
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unsigned int mode)
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{
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struct zip_local_header header;
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uintmax_t offset = zip_offset;
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struct zip_extra_mtime extra;
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struct zip64_extra extra64;
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size_t header_extra_size = ZIP_EXTRA_MTIME_SIZE;
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int need_zip64_extra = 0;
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unsigned long attr2;
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unsigned long compressed_size;
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unsigned long crc;
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enum zip_method method;
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unsigned char *out;
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void *deflated = NULL;
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void *buffer;
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struct git_istream *stream = NULL;
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unsigned long flags = 0;
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unsigned long size;
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int is_binary = -1;
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const char *path_without_prefix = path + args->baselen;
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unsigned int creator_version = 0;
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unsigned int version_needed = 10;
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size_t zip_dir_extra_size = ZIP_EXTRA_MTIME_SIZE;
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size_t zip64_dir_extra_payload_size = 0;
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crc = crc32(0, NULL, 0);
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if (!has_only_ascii(path)) {
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if (is_utf8(path))
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flags |= ZIP_UTF8;
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else
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warning(_("path is not valid UTF-8: %s"), path);
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}
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if (pathlen > 0xffff) {
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return error(_("path too long (%d chars, SHA1: %s): %s"),
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(int)pathlen, oid_to_hex(oid), path);
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}
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if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
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method = ZIP_METHOD_STORE;
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attr2 = 16;
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out = NULL;
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size = 0;
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compressed_size = 0;
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buffer = NULL;
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} else if (S_ISREG(mode) || S_ISLNK(mode)) {
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enum object_type type = oid_object_info(args->repo, oid,
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&size);
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method = ZIP_METHOD_STORE;
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attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
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(mode & 0111) ? ((mode) << 16) : 0;
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if (S_ISLNK(mode) || (mode & 0111))
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creator_version = 0x0317;
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if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
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method = ZIP_METHOD_DEFLATE;
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if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
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size > big_file_threshold) {
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stream = open_istream(args->repo, oid, &type, &size,
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NULL);
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if (!stream)
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return error(_("cannot stream blob %s"),
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oid_to_hex(oid));
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flags |= ZIP_STREAM;
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out = buffer = NULL;
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} else {
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buffer = object_file_to_archive(args, path, oid, mode,
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&type, &size);
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if (!buffer)
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return error(_("cannot read %s"),
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oid_to_hex(oid));
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crc = crc32(crc, buffer, size);
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is_binary = entry_is_binary(args->repo->index,
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path_without_prefix,
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buffer, size);
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out = buffer;
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}
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compressed_size = (method == ZIP_METHOD_STORE) ? size : 0;
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} else {
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return error(_("unsupported file mode: 0%o (SHA1: %s)"), mode,
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oid_to_hex(oid));
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}
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if (creator_version > max_creator_version)
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max_creator_version = creator_version;
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if (buffer && method == ZIP_METHOD_DEFLATE) {
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out = deflated = zlib_deflate_raw(buffer, size,
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args->compression_level,
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&compressed_size);
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if (!out || compressed_size >= size) {
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out = buffer;
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method = ZIP_METHOD_STORE;
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compressed_size = size;
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}
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}
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copy_le16(extra.magic, 0x5455);
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copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
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extra.flags[0] = 1; /* just mtime */
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copy_le32(extra.mtime, args->time);
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if (size > 0xffffffff || compressed_size > 0xffffffff)
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need_zip64_extra = 1;
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if (stream && size > 0x7fffffff)
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need_zip64_extra = 1;
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if (need_zip64_extra)
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version_needed = 45;
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copy_le32(header.magic, 0x04034b50);
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copy_le16(header.version, version_needed);
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copy_le16(header.flags, flags);
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copy_le16(header.compression_method, method);
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copy_le16(header.mtime, zip_time);
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copy_le16(header.mdate, zip_date);
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if (need_zip64_extra) {
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set_zip_header_data_desc(&header, 0xffffffff, 0xffffffff, crc);
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header_extra_size += ZIP64_EXTRA_SIZE;
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} else {
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set_zip_header_data_desc(&header, size, compressed_size, crc);
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}
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copy_le16(header.filename_length, pathlen);
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copy_le16(header.extra_length, header_extra_size);
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write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
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zip_offset += ZIP_LOCAL_HEADER_SIZE;
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write_or_die(1, path, pathlen);
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zip_offset += pathlen;
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write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
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zip_offset += ZIP_EXTRA_MTIME_SIZE;
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if (need_zip64_extra) {
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copy_le16(extra64.magic, 0x0001);
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copy_le16(extra64.extra_size, ZIP64_EXTRA_PAYLOAD_SIZE);
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copy_le64(extra64.size, size);
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copy_le64(extra64.compressed_size, compressed_size);
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write_or_die(1, &extra64, ZIP64_EXTRA_SIZE);
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zip_offset += ZIP64_EXTRA_SIZE;
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}
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if (stream && method == ZIP_METHOD_STORE) {
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unsigned char buf[STREAM_BUFFER_SIZE];
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ssize_t readlen;
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for (;;) {
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readlen = read_istream(stream, buf, sizeof(buf));
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if (readlen <= 0)
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break;
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crc = crc32(crc, buf, readlen);
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if (is_binary == -1)
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is_binary = entry_is_binary(args->repo->index,
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path_without_prefix,
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buf, readlen);
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write_or_die(1, buf, readlen);
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}
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close_istream(stream);
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if (readlen)
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return readlen;
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compressed_size = size;
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zip_offset += compressed_size;
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write_zip_data_desc(size, compressed_size, crc);
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} else if (stream && method == ZIP_METHOD_DEFLATE) {
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unsigned char buf[STREAM_BUFFER_SIZE];
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ssize_t readlen;
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git_zstream zstream;
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int result;
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size_t out_len;
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unsigned char compressed[STREAM_BUFFER_SIZE * 2];
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git_deflate_init_raw(&zstream, args->compression_level);
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compressed_size = 0;
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zstream.next_out = compressed;
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zstream.avail_out = sizeof(compressed);
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for (;;) {
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readlen = read_istream(stream, buf, sizeof(buf));
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if (readlen <= 0)
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break;
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crc = crc32(crc, buf, readlen);
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if (is_binary == -1)
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is_binary = entry_is_binary(args->repo->index,
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path_without_prefix,
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buf, readlen);
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zstream.next_in = buf;
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zstream.avail_in = readlen;
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result = git_deflate(&zstream, 0);
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if (result != Z_OK)
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die(_("deflate error (%d)"), result);
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out_len = zstream.next_out - compressed;
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if (out_len > 0) {
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write_or_die(1, compressed, out_len);
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compressed_size += out_len;
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zstream.next_out = compressed;
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zstream.avail_out = sizeof(compressed);
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}
|
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|
|
}
|
|
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);
|
|
free(buffer);
|
|
|
|
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, void *data)
|
|
{
|
|
return userdiff_config(var, value);
|
|
}
|
|
|
|
static int write_zip_archive(const struct archiver *ar,
|
|
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 = {
|
|
"zip",
|
|
write_zip_archive,
|
|
ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
|
|
};
|
|
|
|
void init_zip_archiver(void)
|
|
{
|
|
register_archiver(&zip_archiver);
|
|
}
|