| /* |
| * Copyright (c) 2006 Rene Scharfe |
| */ |
| #include "cache.h" |
| #include "archive.h" |
| |
| static int zip_date; |
| static int zip_time; |
| |
| static unsigned char *zip_dir; |
| static unsigned int zip_dir_size; |
| |
| static unsigned int zip_offset; |
| static unsigned int zip_dir_offset; |
| static unsigned int zip_dir_entries; |
| |
| #define ZIP_DIRECTORY_MIN_SIZE (1024 * 1024) |
| |
| 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_dir_header { |
| unsigned char magic[4]; |
| unsigned char creator_version[2]; |
| 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 comment_length[2]; |
| unsigned char disk[2]; |
| unsigned char attr1[2]; |
| unsigned char attr2[4]; |
| unsigned char offset[4]; |
| 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]; |
| }; |
| |
| /* |
| * 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_DIR_HEADER_SIZE offsetof(struct zip_dir_header, _end) |
| #define ZIP_DIR_TRAILER_SIZE offsetof(struct zip_dir_trailer, _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 *zlib_deflate(void *data, unsigned long size, |
| int compression_level, unsigned long *compressed_size) |
| { |
| git_zstream stream; |
| unsigned long maxsize; |
| void *buffer; |
| int result; |
| |
| memset(&stream, 0, sizeof(stream)); |
| git_deflate_init(&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 int write_zip_entry(struct archiver_args *args, |
| const unsigned char *sha1, const char *path, size_t pathlen, |
| unsigned int mode, void *buffer, unsigned long size) |
| { |
| struct zip_local_header header; |
| struct zip_dir_header dirent; |
| unsigned long attr2; |
| unsigned long compressed_size; |
| unsigned long uncompressed_size; |
| unsigned long crc; |
| unsigned long direntsize; |
| int method; |
| unsigned char *out; |
| void *deflated = NULL; |
| |
| crc = crc32(0, NULL, 0); |
| |
| if (pathlen > 0xffff) { |
| return error("path too long (%d chars, SHA1: %s): %s", |
| (int)pathlen, sha1_to_hex(sha1), path); |
| } |
| |
| if (S_ISDIR(mode) || S_ISGITLINK(mode)) { |
| method = 0; |
| attr2 = 16; |
| out = NULL; |
| uncompressed_size = 0; |
| compressed_size = 0; |
| } else if (S_ISREG(mode) || S_ISLNK(mode)) { |
| method = 0; |
| attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) : |
| (mode & 0111) ? ((mode) << 16) : 0; |
| if (S_ISREG(mode) && args->compression_level != 0) |
| method = 8; |
| crc = crc32(crc, buffer, size); |
| out = buffer; |
| uncompressed_size = size; |
| compressed_size = size; |
| } else { |
| return error("unsupported file mode: 0%o (SHA1: %s)", mode, |
| sha1_to_hex(sha1)); |
| } |
| |
| if (method == 8) { |
| deflated = zlib_deflate(buffer, size, args->compression_level, |
| &compressed_size); |
| if (deflated && compressed_size - 6 < size) { |
| /* ZLIB --> raw compressed data (see RFC 1950) */ |
| /* CMF and FLG ... */ |
| out = (unsigned char *)deflated + 2; |
| compressed_size -= 6; /* ... and ADLER32 */ |
| } else { |
| method = 0; |
| compressed_size = size; |
| } |
| } |
| |
| /* make sure we have enough free space in the dictionary */ |
| direntsize = ZIP_DIR_HEADER_SIZE + pathlen; |
| while (zip_dir_size < zip_dir_offset + direntsize) { |
| zip_dir_size += ZIP_DIRECTORY_MIN_SIZE; |
| zip_dir = xrealloc(zip_dir, zip_dir_size); |
| } |
| |
| copy_le32(dirent.magic, 0x02014b50); |
| copy_le16(dirent.creator_version, |
| S_ISLNK(mode) || (S_ISREG(mode) && (mode & 0111)) ? 0x0317 : 0); |
| copy_le16(dirent.version, 10); |
| copy_le16(dirent.flags, 0); |
| copy_le16(dirent.compression_method, method); |
| copy_le16(dirent.mtime, zip_time); |
| copy_le16(dirent.mdate, zip_date); |
| copy_le32(dirent.crc32, crc); |
| copy_le32(dirent.compressed_size, compressed_size); |
| copy_le32(dirent.size, uncompressed_size); |
| copy_le16(dirent.filename_length, pathlen); |
| copy_le16(dirent.extra_length, 0); |
| copy_le16(dirent.comment_length, 0); |
| copy_le16(dirent.disk, 0); |
| copy_le16(dirent.attr1, 0); |
| copy_le32(dirent.attr2, attr2); |
| copy_le32(dirent.offset, zip_offset); |
| memcpy(zip_dir + zip_dir_offset, &dirent, ZIP_DIR_HEADER_SIZE); |
| zip_dir_offset += ZIP_DIR_HEADER_SIZE; |
| memcpy(zip_dir + zip_dir_offset, path, pathlen); |
| zip_dir_offset += pathlen; |
| zip_dir_entries++; |
| |
| copy_le32(header.magic, 0x04034b50); |
| copy_le16(header.version, 10); |
| copy_le16(header.flags, 0); |
| copy_le16(header.compression_method, method); |
| copy_le16(header.mtime, zip_time); |
| copy_le16(header.mdate, zip_date); |
| copy_le32(header.crc32, crc); |
| copy_le32(header.compressed_size, compressed_size); |
| copy_le32(header.size, uncompressed_size); |
| copy_le16(header.filename_length, pathlen); |
| copy_le16(header.extra_length, 0); |
| write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE); |
| zip_offset += ZIP_LOCAL_HEADER_SIZE; |
| write_or_die(1, path, pathlen); |
| zip_offset += pathlen; |
| if (compressed_size > 0) { |
| write_or_die(1, out, compressed_size); |
| zip_offset += compressed_size; |
| } |
| |
| free(deflated); |
| |
| return 0; |
| } |
| |
| static void write_zip_trailer(const unsigned char *sha1) |
| { |
| struct zip_dir_trailer trailer; |
| |
| 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_le32(trailer.size, zip_dir_offset); |
| copy_le32(trailer.offset, zip_offset); |
| copy_le16(trailer.comment_length, sha1 ? 40 : 0); |
| |
| write_or_die(1, zip_dir, zip_dir_offset); |
| write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE); |
| if (sha1) |
| write_or_die(1, sha1_to_hex(sha1), 40); |
| } |
| |
| static void dos_time(time_t *time, int *dos_date, int *dos_time) |
| { |
| struct tm *t = localtime(time); |
| |
| *dos_date = t->tm_mday + (t->tm_mon + 1) * 32 + |
| (t->tm_year + 1900 - 1980) * 512; |
| *dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048; |
| } |
| |
| int write_zip_archive(struct archiver_args *args) |
| { |
| int err; |
| |
| dos_time(&args->time, &zip_date, &zip_time); |
| |
| zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE); |
| zip_dir_size = ZIP_DIRECTORY_MIN_SIZE; |
| |
| err = write_archive_entries(args, write_zip_entry); |
| if (!err) |
| write_zip_trailer(args->commit_sha1); |
| |
| free(zip_dir); |
| |
| return err; |
| } |