[thirdparty/git.git] / archive-zip.c

/*
 * 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)
{
	z_stream stream;
	unsigned long maxsize;
	void *buffer;
	int result;

	memset(&stream, 0, sizeof(stream));
	deflateInit(&stream, compression_level);
	maxsize = deflateBound(&stream, size);
	buffer = xmalloc(maxsize);

	stream.next_in = data;
	stream.avail_in = size;
	stream.next_out = buffer;
	stream.avail_out = maxsize;

	do {
		result = deflate(&stream, Z_FINISH);
	} while (result == Z_OK);

	if (result != Z_STREAM_END) {
		free(buffer);
		return NULL;
	}

	deflateEnd(&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;
}
Commit	Line	Data
e4fbbfe9 RS	1	/*
	2	* Copyright (c) 2006 Rene Scharfe
	3	*/
e4fbbfe9	4	#include "cache.h"
ec06bff5	5	#include "archive.h"
e4fbbfe9	6
e4fbbfe9 RS	7	static int zip_date;
	8	static int zip_time;
	9
	10	static unsigned char *zip_dir;
	11	static unsigned int zip_dir_size;
	12
	13	static unsigned int zip_offset;
	14	static unsigned int zip_dir_offset;
	15	static unsigned int zip_dir_entries;
	16
	17	#define ZIP_DIRECTORY_MIN_SIZE (1024 * 1024)
	18
	19	struct zip_local_header {
	20	unsigned char magic[4];
	21	unsigned char version[2];
	22	unsigned char flags[2];
	23	unsigned char compression_method[2];
	24	unsigned char mtime[2];
	25	unsigned char mdate[2];
	26	unsigned char crc32[4];
	27	unsigned char compressed_size[4];
	28	unsigned char size[4];
	29	unsigned char filename_length[2];
	30	unsigned char extra_length[2];
0ea865ce	31	unsigned char _end[1];
e4fbbfe9 RS	32	};
	33
	34	struct zip_dir_header {
	35	unsigned char magic[4];
	36	unsigned char creator_version[2];
	37	unsigned char version[2];
	38	unsigned char flags[2];
	39	unsigned char compression_method[2];
	40	unsigned char mtime[2];
	41	unsigned char mdate[2];
	42	unsigned char crc32[4];
	43	unsigned char compressed_size[4];
	44	unsigned char size[4];
	45	unsigned char filename_length[2];
	46	unsigned char extra_length[2];
	47	unsigned char comment_length[2];
	48	unsigned char disk[2];
	49	unsigned char attr1[2];
	50	unsigned char attr2[4];
	51	unsigned char offset[4];
0ea865ce	52	unsigned char _end[1];
e4fbbfe9 RS	53	};
	54
	55	struct zip_dir_trailer {
	56	unsigned char magic[4];
	57	unsigned char disk[2];
	58	unsigned char directory_start_disk[2];
	59	unsigned char entries_on_this_disk[2];
	60	unsigned char entries[2];
	61	unsigned char size[4];
	62	unsigned char offset[4];
	63	unsigned char comment_length[2];
0ea865ce	64	unsigned char _end[1];
e4fbbfe9 RS	65	};
e4fbbfe9 RS	66
0ea865ce RS	67	/*
	68	* On ARM, padding is added at the end of the struct, so a simple
	69	* sizeof(struct ...) reports two bytes more than the payload size
	70	* we're interested in.
	71	*/
	72	#define ZIP_LOCAL_HEADER_SIZE offsetof(struct zip_local_header, _end)
	73	#define ZIP_DIR_HEADER_SIZE offsetof(struct zip_dir_header, _end)
	74	#define ZIP_DIR_TRAILER_SIZE offsetof(struct zip_dir_trailer, _end)
	75
e4fbbfe9 RS	76	static void copy_le16(unsigned char *dest, unsigned int n)
	77	{
	78	dest[0] = 0xff & n;
	79	dest[1] = 0xff & (n >> 010);
	80	}
	81
	82	static void copy_le32(unsigned char *dest, unsigned int n)
	83	{
	84	dest[0] = 0xff & n;
	85	dest[1] = 0xff & (n >> 010);
	86	dest[2] = 0xff & (n >> 020);
	87	dest[3] = 0xff & (n >> 030);
	88	}
	89
	90	static void zlib_deflate(void data, unsigned long size,
3a176c6c	91	int compression_level, unsigned long *compressed_size)
e4fbbfe9 RS	92	{
	93	z_stream stream;
	94	unsigned long maxsize;
	95	void *buffer;
	96	int result;
	97
	98	memset(&stream, 0, sizeof(stream));
3a176c6c	99	deflateInit(&stream, compression_level);
e4fbbfe9 RS	100	maxsize = deflateBound(&stream, size);
	101	buffer = xmalloc(maxsize);
	102
	103	stream.next_in = data;
	104	stream.avail_in = size;
	105	stream.next_out = buffer;
	106	stream.avail_out = maxsize;
	107
	108	do {
	109	result = deflate(&stream, Z_FINISH);
	110	} while (result == Z_OK);
	111
	112	if (result != Z_STREAM_END) {
	113	free(buffer);
	114	return NULL;
	115	}
	116
	117	deflateEnd(&stream);
	118	*compressed_size = stream.total_out;
	119
	120	return buffer;
	121	}
	122
562e25ab RS	123	static int write_zip_entry(struct archiver_args *args,
	124	const unsigned char sha1, const char path, size_t pathlen,
	125	unsigned int mode, void *buffer, unsigned long size)
e4fbbfe9 RS	126	{
	127	struct zip_local_header header;
	128	struct zip_dir_header dirent;
62cdce17	129	unsigned long attr2;
e4fbbfe9 RS	130	unsigned long compressed_size;
	131	unsigned long uncompressed_size;
	132	unsigned long crc;
	133	unsigned long direntsize;
e4fbbfe9	134	int method;
e4fbbfe9	135	unsigned char *out;
e4fbbfe9 RS	136	void *deflated = NULL;
e4fbbfe9 RS	137
38f4d138	138	crc = crc32(0, NULL, 0);
e4fbbfe9	139
e4fbbfe9	140	if (pathlen > 0xffff) {
562e25ab RS	141	return error("path too long (%d chars, SHA1: %s): %s",
562e25ab RS	142	(int)pathlen, sha1_to_hex(sha1), path);
e4fbbfe9 RS	143	}
e4fbbfe9 RS	144
302b9282	145	if (S_ISDIR(mode) \|\| S_ISGITLINK(mode)) {
e4fbbfe9	146	method = 0;
62cdce17	147	attr2 = 16;
e4fbbfe9 RS	148	out = NULL;
	149	uncompressed_size = 0;
	150	compressed_size = 0;
62cdce17 RS	151	} else if (S_ISREG(mode) \|\| S_ISLNK(mode)) {
62cdce17 RS	152	method = 0;
76bf8d0e DP	153	attr2 = S_ISLNK(mode) ? ((mode \| 0777) << 16) :
76bf8d0e DP	154	(mode & 0111) ? ((mode) << 16) : 0;
3a176c6c	155	if (S_ISREG(mode) && args->compression_level != 0)
62cdce17	156	method = 8;
e4fbbfe9 RS	157	crc = crc32(crc, buffer, size);
	158	out = buffer;
	159	uncompressed_size = size;
	160	compressed_size = size;
	161	} else {
562e25ab RS	162	return error("unsupported file mode: 0%o (SHA1: %s)", mode,
562e25ab RS	163	sha1_to_hex(sha1));
e4fbbfe9 RS	164	}
	165
	166	if (method == 8) {
3a176c6c RS	167	deflated = zlib_deflate(buffer, size, args->compression_level,
3a176c6c RS	168	&compressed_size);
e4fbbfe9 RS	169	if (deflated && compressed_size - 6 < size) {
	170	/* ZLIB --> raw compressed data (see RFC 1950) */
	171	/* CMF and FLG ... */
	172	out = (unsigned char *)deflated + 2;
	173	compressed_size -= 6; /* ... and ADLER32 */
	174	} else {
	175	method = 0;
	176	compressed_size = size;
	177	}
	178	}
	179
	180	/* make sure we have enough free space in the dictionary */
0ea865ce	181	direntsize = ZIP_DIR_HEADER_SIZE + pathlen;
e4fbbfe9 RS	182	while (zip_dir_size < zip_dir_offset + direntsize) {
	183	zip_dir_size += ZIP_DIRECTORY_MIN_SIZE;
	184	zip_dir = xrealloc(zip_dir, zip_dir_size);
	185	}
	186
	187	copy_le32(dirent.magic, 0x02014b50);
76bf8d0e DP	188	copy_le16(dirent.creator_version,
76bf8d0e DP	189	S_ISLNK(mode) \|\| (S_ISREG(mode) && (mode & 0111)) ? 0x0317 : 0);
cf72fb07	190	copy_le16(dirent.version, 10);
e4fbbfe9 RS	191	copy_le16(dirent.flags, 0);
	192	copy_le16(dirent.compression_method, method);
	193	copy_le16(dirent.mtime, zip_time);
	194	copy_le16(dirent.mdate, zip_date);
	195	copy_le32(dirent.crc32, crc);
	196	copy_le32(dirent.compressed_size, compressed_size);
	197	copy_le32(dirent.size, uncompressed_size);
	198	copy_le16(dirent.filename_length, pathlen);
	199	copy_le16(dirent.extra_length, 0);
	200	copy_le16(dirent.comment_length, 0);
	201	copy_le16(dirent.disk, 0);
	202	copy_le16(dirent.attr1, 0);
62cdce17	203	copy_le32(dirent.attr2, attr2);
e4fbbfe9	204	copy_le32(dirent.offset, zip_offset);
0ea865ce RS	205	memcpy(zip_dir + zip_dir_offset, &dirent, ZIP_DIR_HEADER_SIZE);
0ea865ce RS	206	zip_dir_offset += ZIP_DIR_HEADER_SIZE;
e4fbbfe9 RS	207	memcpy(zip_dir + zip_dir_offset, path, pathlen);
	208	zip_dir_offset += pathlen;
	209	zip_dir_entries++;
	210
	211	copy_le32(header.magic, 0x04034b50);
cf72fb07	212	copy_le16(header.version, 10);
e4fbbfe9 RS	213	copy_le16(header.flags, 0);
	214	copy_le16(header.compression_method, method);
	215	copy_le16(header.mtime, zip_time);
	216	copy_le16(header.mdate, zip_date);
	217	copy_le32(header.crc32, crc);
	218	copy_le32(header.compressed_size, compressed_size);
	219	copy_le32(header.size, uncompressed_size);
	220	copy_le16(header.filename_length, pathlen);
	221	copy_le16(header.extra_length, 0);
0ea865ce RS	222	write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
0ea865ce RS	223	zip_offset += ZIP_LOCAL_HEADER_SIZE;
e4fbbfe9 RS	224	write_or_die(1, path, pathlen);
	225	zip_offset += pathlen;
	226	if (compressed_size > 0) {
	227	write_or_die(1, out, compressed_size);
	228	zip_offset += compressed_size;
	229	}
	230
e4fbbfe9	231	free(deflated);
e4fbbfe9	232
562e25ab	233	return 0;
e4fbbfe9 RS	234	}
	235
	236	static void write_zip_trailer(const unsigned char *sha1)
	237	{
	238	struct zip_dir_trailer trailer;
	239
	240	copy_le32(trailer.magic, 0x06054b50);
	241	copy_le16(trailer.disk, 0);
	242	copy_le16(trailer.directory_start_disk, 0);
	243	copy_le16(trailer.entries_on_this_disk, zip_dir_entries);
	244	copy_le16(trailer.entries, zip_dir_entries);
	245	copy_le32(trailer.size, zip_dir_offset);
	246	copy_le32(trailer.offset, zip_offset);
	247	copy_le16(trailer.comment_length, sha1 ? 40 : 0);
	248
	249	write_or_die(1, zip_dir, zip_dir_offset);
0ea865ce	250	write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
e4fbbfe9 RS	251	if (sha1)
	252	write_or_die(1, sha1_to_hex(sha1), 40);
	253	}
	254
	255	static void dos_time(time_t time, int dos_date, int *dos_time)
	256	{
	257	struct tm *t = localtime(time);
	258
	259	dos_date = t->tm_mday + (t->tm_mon + 1) 32 +
	260	(t->tm_year + 1900 - 1980) * 512;
	261	dos_time = t->tm_sec / 2 + t->tm_min 32 + t->tm_hour * 2048;
	262	}
	263
ec06bff5 FBH	264	int write_zip_archive(struct archiver_args *args)
ec06bff5 FBH	265	{
562e25ab RS	266	int err;
562e25ab RS	267
ec06bff5 FBH	268	dos_time(&args->time, &zip_date, &zip_time);
	269
	270	zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
	271	zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
562e25ab RS	272
	273	err = write_archive_entries(args, write_zip_entry);
	274	if (!err)
	275	write_zip_trailer(args->commit_sha1);
ec06bff5 FBH	276
	277	free(zip_dir);
	278
562e25ab	279	return err;
ec06bff5	280	}