diff options
Diffstat (limited to 'archive-zip.c')
| -rw-r--r-- | archive-zip.c | 475 |
1 files changed, 475 insertions, 0 deletions
diff --git a/archive-zip.c b/archive-zip.c new file mode 100644 index 0000000..4bde019 --- /dev/null +++ b/archive-zip.c @@ -0,0 +1,475 @@ +/* + * Copyright (c) 2006 Rene Scharfe + */ +#include "cache.h" +#include "archive.h" +#include "streaming.h" +#include "utf8.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) +#define ZIP_STREAM (1 << 3) +#define ZIP_UTF8 (1 << 11) + +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 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]; +}; + +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]; +}; + +/* + * 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 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)) + +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_raw(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_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) +{ + 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); +} + +static void set_zip_dir_data_desc(struct zip_dir_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 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; + } +} + +#define STREAM_BUFFER_SIZE (1024 * 16) + +static int write_zip_entry(struct archiver_args *args, + const unsigned char *sha1, + const char *path, size_t pathlen, + unsigned int mode) +{ + struct zip_local_header header; + struct zip_dir_header dirent; + struct zip_extra_mtime extra; + unsigned long attr2; + unsigned long compressed_size; + unsigned long crc; + unsigned long direntsize; + int method; + unsigned char *out; + void *deflated = NULL; + void *buffer; + struct git_istream *stream = NULL; + unsigned long flags = 0; + unsigned long size; + + 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, sha1_to_hex(sha1), path); + } + + if (S_ISDIR(mode) || S_ISGITLINK(mode)) { + method = 0; + attr2 = 16; + out = NULL; + size = 0; + compressed_size = 0; + buffer = NULL; + } else if (S_ISREG(mode) || S_ISLNK(mode)) { + enum object_type type = sha1_object_info(sha1, &size); + + method = 0; + attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) : + (mode & 0111) ? ((mode) << 16) : 0; + if (S_ISREG(mode) && args->compression_level != 0 && size > 0) + method = 8; + + if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert && + size > big_file_threshold) { + stream = open_istream(sha1, &type, &size, NULL); + if (!stream) + return error("cannot stream blob %s", + sha1_to_hex(sha1)); + flags |= ZIP_STREAM; + out = buffer = NULL; + } else { + buffer = sha1_file_to_archive(args, path, sha1, mode, + &type, &size); + if (!buffer) + return error("cannot read %s", + sha1_to_hex(sha1)); + crc = crc32(crc, buffer, size); + out = buffer; + } + compressed_size = (method == 0) ? size : 0; + } else { + return error("unsupported file mode: 0%o (SHA1: %s)", mode, + sha1_to_hex(sha1)); + } + + if (buffer && method == 8) { + out = deflated = zlib_deflate_raw(buffer, size, + args->compression_level, + &compressed_size); + if (!out || compressed_size >= size) { + out = buffer; + method = 0; + 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); + + /* make sure we have enough free space in the dictionary */ + direntsize = ZIP_DIR_HEADER_SIZE + pathlen + ZIP_EXTRA_MTIME_SIZE; + 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, flags); + copy_le16(dirent.compression_method, method); + copy_le16(dirent.mtime, zip_time); + copy_le16(dirent.mdate, zip_date); + set_zip_dir_data_desc(&dirent, size, compressed_size, crc); + copy_le16(dirent.filename_length, pathlen); + copy_le16(dirent.extra_length, ZIP_EXTRA_MTIME_SIZE); + 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); + + copy_le32(header.magic, 0x04034b50); + copy_le16(header.version, 10); + copy_le16(header.flags, flags); + copy_le16(header.compression_method, method); + copy_le16(header.mtime, zip_time); + copy_le16(header.mdate, zip_date); + set_zip_header_data_desc(&header, size, compressed_size, crc); + copy_le16(header.filename_length, pathlen); + copy_le16(header.extra_length, ZIP_EXTRA_MTIME_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 (stream && method == 0) { + 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); + 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); + zip_offset += ZIP_DATA_DESC_SIZE; + + set_zip_dir_data_desc(&dirent, size, compressed_size, crc); + } else if (stream && method == 8) { + 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]; + + memset(&zstream, 0, sizeof(zstream)); + 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); + + 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); + zip_offset += ZIP_DATA_DESC_SIZE; + + set_zip_dir_data_desc(&dirent, size, compressed_size, crc); + } else if (compressed_size > 0) { + write_or_die(1, out, compressed_size); + zip_offset += compressed_size; + } + + free(deflated); + free(buffer); + + 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; + memcpy(zip_dir + zip_dir_offset, &extra, ZIP_EXTRA_MTIME_SIZE); + zip_dir_offset += ZIP_EXTRA_MTIME_SIZE; + zip_dir_entries++; + + 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; +} + +static int write_zip_archive(const struct archiver *ar, + 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; +} + +static struct archiver zip_archiver = { + "zip", + write_zip_archive, + ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE +}; + +void init_zip_archiver(void) +{ + register_archiver(&zip_archiver); +} |