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

/*
 * Copyright (c) 2006 Rene Scharfe
 */
#include "cache.h"
#include "commit.h"
#include "blob.h"
#include "tree.h"
#include "quote.h"
#include "builtin.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,
                          unsigned long *compressed_size)
{
	z_stream stream;
	unsigned long maxsize;
	void *buffer;
	int result;

	memset(&stream, 0, sizeof(stream));
	deflateInit(&stream, zlib_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) && zlib_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, &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;
}

void *parse_extra_zip_args(int argc, const char **argv)
{
	for (; argc > 0; argc--, argv++) {
		const char *arg = argv[0];

		if (arg[0] == '-' && isdigit(arg[1]) && arg[2] == '\0')
			zlib_compression_level = arg[1] - '0';
		else
			die("Unknown argument for zip format: %s", arg);
	}
	return NULL;
}
Commit	Line	Data
e4fbbfe9 RS	1	/*
	2	* Copyright (c) 2006 Rene Scharfe
	3	*/
e4fbbfe9 RS	4	#include "cache.h"
	5	#include "commit.h"
	6	#include "blob.h"
	7	#include "tree.h"
	8	#include "quote.h"
	9	#include "builtin.h"
ec06bff5	10	#include "archive.h"
e4fbbfe9	11
e4fbbfe9 RS	12	static int zip_date;
	13	static int zip_time;
	14
	15	static unsigned char *zip_dir;
	16	static unsigned int zip_dir_size;
	17
	18	static unsigned int zip_offset;
	19	static unsigned int zip_dir_offset;
	20	static unsigned int zip_dir_entries;
	21
	22	#define ZIP_DIRECTORY_MIN_SIZE (1024 * 1024)
	23
	24	struct zip_local_header {
	25	unsigned char magic[4];
	26	unsigned char version[2];
	27	unsigned char flags[2];
	28	unsigned char compression_method[2];
	29	unsigned char mtime[2];
	30	unsigned char mdate[2];
	31	unsigned char crc32[4];
	32	unsigned char compressed_size[4];
	33	unsigned char size[4];
	34	unsigned char filename_length[2];
	35	unsigned char extra_length[2];
0ea865ce	36	unsigned char _end[1];
e4fbbfe9 RS	37	};
	38
	39	struct zip_dir_header {
	40	unsigned char magic[4];
	41	unsigned char creator_version[2];
	42	unsigned char version[2];
	43	unsigned char flags[2];
	44	unsigned char compression_method[2];
	45	unsigned char mtime[2];
	46	unsigned char mdate[2];
	47	unsigned char crc32[4];
	48	unsigned char compressed_size[4];
	49	unsigned char size[4];
	50	unsigned char filename_length[2];
	51	unsigned char extra_length[2];
	52	unsigned char comment_length[2];
	53	unsigned char disk[2];
	54	unsigned char attr1[2];
	55	unsigned char attr2[4];
	56	unsigned char offset[4];
0ea865ce	57	unsigned char _end[1];
e4fbbfe9 RS	58	};
	59
	60	struct zip_dir_trailer {
	61	unsigned char magic[4];
	62	unsigned char disk[2];
	63	unsigned char directory_start_disk[2];
	64	unsigned char entries_on_this_disk[2];
	65	unsigned char entries[2];
	66	unsigned char size[4];
	67	unsigned char offset[4];
	68	unsigned char comment_length[2];
0ea865ce	69	unsigned char _end[1];
e4fbbfe9 RS	70	};
e4fbbfe9 RS	71
0ea865ce RS	72	/*
	73	* On ARM, padding is added at the end of the struct, so a simple
	74	* sizeof(struct ...) reports two bytes more than the payload size
	75	* we're interested in.
	76	*/
	77	#define ZIP_LOCAL_HEADER_SIZE offsetof(struct zip_local_header, _end)
	78	#define ZIP_DIR_HEADER_SIZE offsetof(struct zip_dir_header, _end)
	79	#define ZIP_DIR_TRAILER_SIZE offsetof(struct zip_dir_trailer, _end)
	80
e4fbbfe9 RS	81	static void copy_le16(unsigned char *dest, unsigned int n)
	82	{
	83	dest[0] = 0xff & n;
	84	dest[1] = 0xff & (n >> 010);
	85	}
	86
	87	static void copy_le32(unsigned char *dest, unsigned int n)
	88	{
	89	dest[0] = 0xff & n;
	90	dest[1] = 0xff & (n >> 010);
	91	dest[2] = 0xff & (n >> 020);
	92	dest[3] = 0xff & (n >> 030);
	93	}
	94
	95	static void zlib_deflate(void data, unsigned long size,
	96	unsigned long *compressed_size)
	97	{
	98	z_stream stream;
	99	unsigned long maxsize;
	100	void *buffer;
	101	int result;
	102
	103	memset(&stream, 0, sizeof(stream));
	104	deflateInit(&stream, zlib_compression_level);
	105	maxsize = deflateBound(&stream, size);
	106	buffer = xmalloc(maxsize);
	107
	108	stream.next_in = data;
	109	stream.avail_in = size;
	110	stream.next_out = buffer;
	111	stream.avail_out = maxsize;
	112
	113	do {
	114	result = deflate(&stream, Z_FINISH);
	115	} while (result == Z_OK);
	116
	117	if (result != Z_STREAM_END) {
	118	free(buffer);
	119	return NULL;
	120	}
	121
	122	deflateEnd(&stream);
	123	*compressed_size = stream.total_out;
	124
	125	return buffer;
	126	}
	127
562e25ab RS	128	static int write_zip_entry(struct archiver_args *args,
	129	const unsigned char sha1, const char path, size_t pathlen,
	130	unsigned int mode, void *buffer, unsigned long size)
e4fbbfe9 RS	131	{
	132	struct zip_local_header header;
	133	struct zip_dir_header dirent;
62cdce17	134	unsigned long attr2;
e4fbbfe9 RS	135	unsigned long compressed_size;
	136	unsigned long uncompressed_size;
	137	unsigned long crc;
	138	unsigned long direntsize;
e4fbbfe9	139	int method;
e4fbbfe9	140	unsigned char *out;
e4fbbfe9 RS	141	void *deflated = NULL;
e4fbbfe9 RS	142
38f4d138	143	crc = crc32(0, NULL, 0);
e4fbbfe9	144
e4fbbfe9	145	if (pathlen > 0xffff) {
562e25ab RS	146	return error("path too long (%d chars, SHA1: %s): %s",
562e25ab RS	147	(int)pathlen, sha1_to_hex(sha1), path);
e4fbbfe9 RS	148	}
e4fbbfe9 RS	149
302b9282	150	if (S_ISDIR(mode) \|\| S_ISGITLINK(mode)) {
e4fbbfe9	151	method = 0;
62cdce17	152	attr2 = 16;
e4fbbfe9 RS	153	out = NULL;
	154	uncompressed_size = 0;
	155	compressed_size = 0;
62cdce17 RS	156	} else if (S_ISREG(mode) \|\| S_ISLNK(mode)) {
62cdce17 RS	157	method = 0;
76bf8d0e DP	158	attr2 = S_ISLNK(mode) ? ((mode \| 0777) << 16) :
76bf8d0e DP	159	(mode & 0111) ? ((mode) << 16) : 0;
62cdce17 RS	160	if (S_ISREG(mode) && zlib_compression_level != 0)
62cdce17 RS	161	method = 8;
e4fbbfe9 RS	162	crc = crc32(crc, buffer, size);
	163	out = buffer;
	164	uncompressed_size = size;
	165	compressed_size = size;
	166	} else {
562e25ab RS	167	return error("unsupported file mode: 0%o (SHA1: %s)", mode,
562e25ab RS	168	sha1_to_hex(sha1));
e4fbbfe9 RS	169	}
	170
	171	if (method == 8) {
	172	deflated = zlib_deflate(buffer, size, &compressed_size);
	173	if (deflated && compressed_size - 6 < size) {
	174	/* ZLIB --> raw compressed data (see RFC 1950) */
	175	/* CMF and FLG ... */
	176	out = (unsigned char *)deflated + 2;
	177	compressed_size -= 6; /* ... and ADLER32 */
	178	} else {
	179	method = 0;
	180	compressed_size = size;
	181	}
	182	}
	183
	184	/* make sure we have enough free space in the dictionary */
0ea865ce	185	direntsize = ZIP_DIR_HEADER_SIZE + pathlen;
e4fbbfe9 RS	186	while (zip_dir_size < zip_dir_offset + direntsize) {
	187	zip_dir_size += ZIP_DIRECTORY_MIN_SIZE;
	188	zip_dir = xrealloc(zip_dir, zip_dir_size);
	189	}
	190
	191	copy_le32(dirent.magic, 0x02014b50);
76bf8d0e DP	192	copy_le16(dirent.creator_version,
76bf8d0e DP	193	S_ISLNK(mode) \|\| (S_ISREG(mode) && (mode & 0111)) ? 0x0317 : 0);
cf72fb07	194	copy_le16(dirent.version, 10);
e4fbbfe9 RS	195	copy_le16(dirent.flags, 0);
	196	copy_le16(dirent.compression_method, method);
	197	copy_le16(dirent.mtime, zip_time);
	198	copy_le16(dirent.mdate, zip_date);
	199	copy_le32(dirent.crc32, crc);
	200	copy_le32(dirent.compressed_size, compressed_size);
	201	copy_le32(dirent.size, uncompressed_size);
	202	copy_le16(dirent.filename_length, pathlen);
	203	copy_le16(dirent.extra_length, 0);
	204	copy_le16(dirent.comment_length, 0);
	205	copy_le16(dirent.disk, 0);
	206	copy_le16(dirent.attr1, 0);
62cdce17	207	copy_le32(dirent.attr2, attr2);
e4fbbfe9	208	copy_le32(dirent.offset, zip_offset);
0ea865ce RS	209	memcpy(zip_dir + zip_dir_offset, &dirent, ZIP_DIR_HEADER_SIZE);
0ea865ce RS	210	zip_dir_offset += ZIP_DIR_HEADER_SIZE;
e4fbbfe9 RS	211	memcpy(zip_dir + zip_dir_offset, path, pathlen);
	212	zip_dir_offset += pathlen;
	213	zip_dir_entries++;
	214
	215	copy_le32(header.magic, 0x04034b50);
cf72fb07	216	copy_le16(header.version, 10);
e4fbbfe9 RS	217	copy_le16(header.flags, 0);
	218	copy_le16(header.compression_method, method);
	219	copy_le16(header.mtime, zip_time);
	220	copy_le16(header.mdate, zip_date);
	221	copy_le32(header.crc32, crc);
	222	copy_le32(header.compressed_size, compressed_size);
	223	copy_le32(header.size, uncompressed_size);
	224	copy_le16(header.filename_length, pathlen);
	225	copy_le16(header.extra_length, 0);
0ea865ce RS	226	write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
0ea865ce RS	227	zip_offset += ZIP_LOCAL_HEADER_SIZE;
e4fbbfe9 RS	228	write_or_die(1, path, pathlen);
	229	zip_offset += pathlen;
	230	if (compressed_size > 0) {
	231	write_or_die(1, out, compressed_size);
	232	zip_offset += compressed_size;
	233	}
	234
e4fbbfe9	235	free(deflated);
e4fbbfe9	236
562e25ab	237	return 0;
e4fbbfe9 RS	238	}
	239
	240	static void write_zip_trailer(const unsigned char *sha1)
	241	{
	242	struct zip_dir_trailer trailer;
	243
	244	copy_le32(trailer.magic, 0x06054b50);
	245	copy_le16(trailer.disk, 0);
	246	copy_le16(trailer.directory_start_disk, 0);
	247	copy_le16(trailer.entries_on_this_disk, zip_dir_entries);
	248	copy_le16(trailer.entries, zip_dir_entries);
	249	copy_le32(trailer.size, zip_dir_offset);
	250	copy_le32(trailer.offset, zip_offset);
	251	copy_le16(trailer.comment_length, sha1 ? 40 : 0);
	252
	253	write_or_die(1, zip_dir, zip_dir_offset);
0ea865ce	254	write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
e4fbbfe9 RS	255	if (sha1)
	256	write_or_die(1, sha1_to_hex(sha1), 40);
	257	}
	258
	259	static void dos_time(time_t time, int dos_date, int *dos_time)
	260	{
	261	struct tm *t = localtime(time);
	262
	263	dos_date = t->tm_mday + (t->tm_mon + 1) 32 +
	264	(t->tm_year + 1900 - 1980) * 512;
	265	dos_time = t->tm_sec / 2 + t->tm_min 32 + t->tm_hour * 2048;
	266	}
	267
ec06bff5 FBH	268	int write_zip_archive(struct archiver_args *args)
ec06bff5 FBH	269	{
562e25ab RS	270	int err;
562e25ab RS	271
ec06bff5 FBH	272	dos_time(&args->time, &zip_date, &zip_time);
	273
	274	zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
	275	zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
562e25ab RS	276
	277	err = write_archive_entries(args, write_zip_entry);
	278	if (!err)
	279	write_zip_trailer(args->commit_sha1);
ec06bff5 FBH	280
	281	free(zip_dir);
	282
562e25ab	283	return err;
ec06bff5	284	}
854c4168 RS	285
	286	void parse_extra_zip_args(int argc, const char *argv)
	287	{
	288	for (; argc > 0; argc--, argv++) {
	289	const char *arg = argv[0];
	290
	291	if (arg[0] == '-' && isdigit(arg[1]) && arg[2] == '\0')
	292	zlib_compression_level = arg[1] - '0';
	293	else
	294	die("Unknown argument for zip format: %s", arg);
	295	}
	296	return NULL;
	297	}