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

/*
 * Copyright (c) 2006 Rene Scharfe
 */
#include "cache.h"
#include "archive.h"
#include "streaming.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 (8)

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];
};

/*
 * 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)

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 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);
}

#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;
	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 (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;
		size = 0;
	} 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;
		compressed_size = size;

		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;
		}
	} else {
		return error("unsupported file mode: 0%o (SHA1: %s)", mode,
				sha1_to_hex(sha1));
	}

	if (buffer && 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, 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, 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);

	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);
	if (flags & ZIP_STREAM)
		set_zip_header_data_desc(&header, 0, 0, 0);
	else
		set_zip_header_data_desc(&header, size, compressed_size, crc);
	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 (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(&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 = compressed;
			if (!compressed_size)
				out += 2;
			out_len = zstream.next_out - out;

			if (out_len > 0) {
				write_or_die(1, out, 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 = compressed;
		if (!compressed_size)
			out += 2;
		out_len = zstream.next_out - out - 4;
		write_or_die(1, out, 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;
	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);
}
Commit	Line	Data
e4fbbfe9 RS	1	/*
	2	* Copyright (c) 2006 Rene Scharfe
	3	*/
e4fbbfe9	4	#include "cache.h"
ec06bff5	5	#include "archive.h"
2158f883	6	#include "streaming.h"
e4fbbfe9	7
e4fbbfe9 RS	8	static int zip_date;
	9	static int zip_time;
	10
	11	static unsigned char *zip_dir;
	12	static unsigned int zip_dir_size;
	13
	14	static unsigned int zip_offset;
	15	static unsigned int zip_dir_offset;
	16	static unsigned int zip_dir_entries;
	17
	18	#define ZIP_DIRECTORY_MIN_SIZE (1024 * 1024)
2158f883	19	#define ZIP_STREAM (8)
e4fbbfe9 RS	20
	21	struct zip_local_header {
	22	unsigned char magic[4];
	23	unsigned char version[2];
	24	unsigned char flags[2];
	25	unsigned char compression_method[2];
	26	unsigned char mtime[2];
	27	unsigned char mdate[2];
	28	unsigned char crc32[4];
	29	unsigned char compressed_size[4];
	30	unsigned char size[4];
	31	unsigned char filename_length[2];
	32	unsigned char extra_length[2];
0ea865ce	33	unsigned char _end[1];
e4fbbfe9 RS	34	};
e4fbbfe9 RS	35
2158f883 RS	36	struct zip_data_desc {
	37	unsigned char magic[4];
	38	unsigned char crc32[4];
	39	unsigned char compressed_size[4];
	40	unsigned char size[4];
	41	unsigned char _end[1];
	42	};
	43
e4fbbfe9 RS	44	struct zip_dir_header {
	45	unsigned char magic[4];
	46	unsigned char creator_version[2];
	47	unsigned char version[2];
	48	unsigned char flags[2];
	49	unsigned char compression_method[2];
	50	unsigned char mtime[2];
	51	unsigned char mdate[2];
	52	unsigned char crc32[4];
	53	unsigned char compressed_size[4];
	54	unsigned char size[4];
	55	unsigned char filename_length[2];
	56	unsigned char extra_length[2];
	57	unsigned char comment_length[2];
	58	unsigned char disk[2];
	59	unsigned char attr1[2];
	60	unsigned char attr2[4];
	61	unsigned char offset[4];
0ea865ce	62	unsigned char _end[1];
e4fbbfe9 RS	63	};
	64
	65	struct zip_dir_trailer {
	66	unsigned char magic[4];
	67	unsigned char disk[2];
	68	unsigned char directory_start_disk[2];
	69	unsigned char entries_on_this_disk[2];
	70	unsigned char entries[2];
	71	unsigned char size[4];
	72	unsigned char offset[4];
	73	unsigned char comment_length[2];
0ea865ce	74	unsigned char _end[1];
e4fbbfe9 RS	75	};
e4fbbfe9 RS	76
0ea865ce RS	77	/*
	78	* On ARM, padding is added at the end of the struct, so a simple
	79	* sizeof(struct ...) reports two bytes more than the payload size
	80	* we're interested in.
	81	*/
	82	#define ZIP_LOCAL_HEADER_SIZE offsetof(struct zip_local_header, _end)
2158f883	83	#define ZIP_DATA_DESC_SIZE offsetof(struct zip_data_desc, _end)
0ea865ce RS	84	#define ZIP_DIR_HEADER_SIZE offsetof(struct zip_dir_header, _end)
	85	#define ZIP_DIR_TRAILER_SIZE offsetof(struct zip_dir_trailer, _end)
	86
e4fbbfe9 RS	87	static void copy_le16(unsigned char *dest, unsigned int n)
	88	{
	89	dest[0] = 0xff & n;
	90	dest[1] = 0xff & (n >> 010);
	91	}
	92
	93	static void copy_le32(unsigned char *dest, unsigned int n)
	94	{
	95	dest[0] = 0xff & n;
	96	dest[1] = 0xff & (n >> 010);
	97	dest[2] = 0xff & (n >> 020);
	98	dest[3] = 0xff & (n >> 030);
	99	}
	100
	101	static void zlib_deflate(void data, unsigned long size,
3a176c6c	102	int compression_level, unsigned long *compressed_size)
e4fbbfe9	103	{
ef49a7a0	104	git_zstream stream;
e4fbbfe9 RS	105	unsigned long maxsize;
	106	void *buffer;
	107	int result;
	108
	109	memset(&stream, 0, sizeof(stream));
55bb5c91	110	git_deflate_init(&stream, compression_level);
225a6f10	111	maxsize = git_deflate_bound(&stream, size);
e4fbbfe9 RS	112	buffer = xmalloc(maxsize);
	113
	114	stream.next_in = data;
	115	stream.avail_in = size;
	116	stream.next_out = buffer;
	117	stream.avail_out = maxsize;
	118
	119	do {
55bb5c91	120	result = git_deflate(&stream, Z_FINISH);
e4fbbfe9 RS	121	} while (result == Z_OK);
	122
	123	if (result != Z_STREAM_END) {
	124	free(buffer);
	125	return NULL;
	126	}
	127
55bb5c91	128	git_deflate_end(&stream);
e4fbbfe9 RS	129	*compressed_size = stream.total_out;
	130
	131	return buffer;
	132	}
	133
2158f883 RS	134	static void write_zip_data_desc(unsigned long size,
	135	unsigned long compressed_size,
	136	unsigned long crc)
	137	{
	138	struct zip_data_desc trailer;
	139
	140	copy_le32(trailer.magic, 0x08074b50);
	141	copy_le32(trailer.crc32, crc);
	142	copy_le32(trailer.compressed_size, compressed_size);
	143	copy_le32(trailer.size, size);
	144	write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
	145	}
	146
ebf5374a RS	147	static void set_zip_dir_data_desc(struct zip_dir_header *header,
	148	unsigned long size,
	149	unsigned long compressed_size,
	150	unsigned long crc)
	151	{
	152	copy_le32(header->crc32, crc);
	153	copy_le32(header->compressed_size, compressed_size);
	154	copy_le32(header->size, size);
	155	}
	156
	157	static void set_zip_header_data_desc(struct zip_local_header *header,
	158	unsigned long size,
	159	unsigned long compressed_size,
	160	unsigned long crc)
	161	{
	162	copy_le32(header->crc32, crc);
	163	copy_le32(header->compressed_size, compressed_size);
	164	copy_le32(header->size, size);
	165	}
	166
2158f883 RS	167	#define STREAM_BUFFER_SIZE (1024 * 16)
2158f883 RS	168
562e25ab	169	static int write_zip_entry(struct archiver_args *args,
9cb513b7 NTND	170	const unsigned char *sha1,
	171	const char *path, size_t pathlen,
	172	unsigned int mode)
e4fbbfe9 RS	173	{
	174	struct zip_local_header header;
	175	struct zip_dir_header dirent;
62cdce17	176	unsigned long attr2;
e4fbbfe9	177	unsigned long compressed_size;
e4fbbfe9 RS	178	unsigned long crc;
e4fbbfe9 RS	179	unsigned long direntsize;
e4fbbfe9	180	int method;
e4fbbfe9	181	unsigned char *out;
e4fbbfe9	182	void *deflated = NULL;
9cb513b7	183	void *buffer;
2158f883 RS	184	struct git_istream *stream = NULL;
2158f883 RS	185	unsigned long flags = 0;
9cb513b7	186	unsigned long size;
e4fbbfe9	187
38f4d138	188	crc = crc32(0, NULL, 0);
e4fbbfe9	189
e4fbbfe9	190	if (pathlen > 0xffff) {
562e25ab RS	191	return error("path too long (%d chars, SHA1: %s): %s",
562e25ab RS	192	(int)pathlen, sha1_to_hex(sha1), path);
e4fbbfe9 RS	193	}
e4fbbfe9 RS	194
302b9282	195	if (S_ISDIR(mode) \|\| S_ISGITLINK(mode)) {
e4fbbfe9	196	method = 0;
62cdce17	197	attr2 = 16;
e4fbbfe9	198	out = NULL;
60df6bd1	199	size = 0;
e4fbbfe9	200	compressed_size = 0;
9cb513b7 NTND	201	buffer = NULL;
9cb513b7 NTND	202	size = 0;
62cdce17	203	} else if (S_ISREG(mode) \|\| S_ISLNK(mode)) {
2158f883	204	enum object_type type = sha1_object_info(sha1, &size);
9cb513b7	205
62cdce17	206	method = 0;
76bf8d0e DP	207	attr2 = S_ISLNK(mode) ? ((mode \| 0777) << 16) :
76bf8d0e DP	208	(mode & 0111) ? ((mode) << 16) : 0;
2158f883	209	if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
62cdce17	210	method = 8;
e4fbbfe9	211	compressed_size = size;
2158f883 RS	212
2158f883 RS	213	if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
c743c215	214	size > big_file_threshold) {
2158f883 RS	215	stream = open_istream(sha1, &type, &size, NULL);
	216	if (!stream)
	217	return error("cannot stream blob %s",
	218	sha1_to_hex(sha1));
	219	flags \|= ZIP_STREAM;
	220	out = buffer = NULL;
	221	} else {
	222	buffer = sha1_file_to_archive(args, path, sha1, mode,
	223	&type, &size);
	224	if (!buffer)
	225	return error("cannot read %s",
	226	sha1_to_hex(sha1));
	227	crc = crc32(crc, buffer, size);
	228	out = buffer;
	229	}
e4fbbfe9	230	} else {
562e25ab RS	231	return error("unsupported file mode: 0%o (SHA1: %s)", mode,
562e25ab RS	232	sha1_to_hex(sha1));
e4fbbfe9 RS	233	}
e4fbbfe9 RS	234
2158f883	235	if (buffer && method == 8) {
3a176c6c RS	236	deflated = zlib_deflate(buffer, size, args->compression_level,
3a176c6c RS	237	&compressed_size);
e4fbbfe9 RS	238	if (deflated && compressed_size - 6 < size) {
	239	/* ZLIB --> raw compressed data (see RFC 1950) */
	240	/* CMF and FLG ... */
	241	out = (unsigned char *)deflated + 2;
	242	compressed_size -= 6; /* ... and ADLER32 */
	243	} else {
	244	method = 0;
	245	compressed_size = size;
	246	}
	247	}
	248
	249	/* make sure we have enough free space in the dictionary */
0ea865ce	250	direntsize = ZIP_DIR_HEADER_SIZE + pathlen;
e4fbbfe9 RS	251	while (zip_dir_size < zip_dir_offset + direntsize) {
	252	zip_dir_size += ZIP_DIRECTORY_MIN_SIZE;
	253	zip_dir = xrealloc(zip_dir, zip_dir_size);
	254	}
	255
	256	copy_le32(dirent.magic, 0x02014b50);
76bf8d0e DP	257	copy_le16(dirent.creator_version,
76bf8d0e DP	258	S_ISLNK(mode) \|\| (S_ISREG(mode) && (mode & 0111)) ? 0x0317 : 0);
cf72fb07	259	copy_le16(dirent.version, 10);
2158f883	260	copy_le16(dirent.flags, flags);
e4fbbfe9 RS	261	copy_le16(dirent.compression_method, method);
	262	copy_le16(dirent.mtime, zip_time);
	263	copy_le16(dirent.mdate, zip_date);
ebf5374a	264	set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
e4fbbfe9 RS	265	copy_le16(dirent.filename_length, pathlen);
	266	copy_le16(dirent.extra_length, 0);
	267	copy_le16(dirent.comment_length, 0);
	268	copy_le16(dirent.disk, 0);
	269	copy_le16(dirent.attr1, 0);
62cdce17	270	copy_le32(dirent.attr2, attr2);
e4fbbfe9	271	copy_le32(dirent.offset, zip_offset);
e4fbbfe9 RS	272
e4fbbfe9 RS	273	copy_le32(header.magic, 0x04034b50);
cf72fb07	274	copy_le16(header.version, 10);
2158f883	275	copy_le16(header.flags, flags);
e4fbbfe9 RS	276	copy_le16(header.compression_method, method);
	277	copy_le16(header.mtime, zip_time);
	278	copy_le16(header.mdate, zip_date);
2158f883 RS	279	if (flags & ZIP_STREAM)
	280	set_zip_header_data_desc(&header, 0, 0, 0);
	281	else
	282	set_zip_header_data_desc(&header, size, compressed_size, crc);
e4fbbfe9 RS	283	copy_le16(header.filename_length, pathlen);
e4fbbfe9 RS	284	copy_le16(header.extra_length, 0);
0ea865ce RS	285	write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
0ea865ce RS	286	zip_offset += ZIP_LOCAL_HEADER_SIZE;
e4fbbfe9 RS	287	write_or_die(1, path, pathlen);
e4fbbfe9 RS	288	zip_offset += pathlen;
2158f883 RS	289	if (stream && method == 0) {
	290	unsigned char buf[STREAM_BUFFER_SIZE];
	291	ssize_t readlen;
	292
	293	for (;;) {
	294	readlen = read_istream(stream, buf, sizeof(buf));
	295	if (readlen <= 0)
	296	break;
	297	crc = crc32(crc, buf, readlen);
	298	write_or_die(1, buf, readlen);
	299	}
	300	close_istream(stream);
	301	if (readlen)
	302	return readlen;
	303
	304	compressed_size = size;
	305	zip_offset += compressed_size;
	306
	307	write_zip_data_desc(size, compressed_size, crc);
	308	zip_offset += ZIP_DATA_DESC_SIZE;
	309
c743c215 RS	310	set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
	311	} else if (stream && method == 8) {
	312	unsigned char buf[STREAM_BUFFER_SIZE];
	313	ssize_t readlen;
	314	git_zstream zstream;
	315	int result;
	316	size_t out_len;
	317	unsigned char compressed[STREAM_BUFFER_SIZE * 2];
	318
	319	memset(&zstream, 0, sizeof(zstream));
	320	git_deflate_init(&zstream, args->compression_level);
	321
	322	compressed_size = 0;
	323	zstream.next_out = compressed;
	324	zstream.avail_out = sizeof(compressed);
	325
	326	for (;;) {
	327	readlen = read_istream(stream, buf, sizeof(buf));
	328	if (readlen <= 0)
	329	break;
	330	crc = crc32(crc, buf, readlen);
	331
	332	zstream.next_in = buf;
	333	zstream.avail_in = readlen;
	334	result = git_deflate(&zstream, 0);
	335	if (result != Z_OK)
	336	die("deflate error (%d)", result);
	337	out = compressed;
	338	if (!compressed_size)
	339	out += 2;
	340	out_len = zstream.next_out - out;
	341
	342	if (out_len > 0) {
	343	write_or_die(1, out, out_len);
	344	compressed_size += out_len;
	345	zstream.next_out = compressed;
	346	zstream.avail_out = sizeof(compressed);
	347	}
	348
	349	}
	350	close_istream(stream);
	351	if (readlen)
	352	return readlen;
	353
	354	zstream.next_in = buf;
	355	zstream.avail_in = 0;
	356	result = git_deflate(&zstream, Z_FINISH);
	357	if (result != Z_STREAM_END)
	358	die("deflate error (%d)", result);
	359
	360	git_deflate_end(&zstream);
	361	out = compressed;
	362	if (!compressed_size)
	363	out += 2;
	364	out_len = zstream.next_out - out - 4;
	365	write_or_die(1, out, out_len);
	366	compressed_size += out_len;
	367	zip_offset += compressed_size;
	368
	369	write_zip_data_desc(size, compressed_size, crc);
	370	zip_offset += ZIP_DATA_DESC_SIZE;
	371
2158f883 RS	372	set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
2158f883 RS	373	} else if (compressed_size > 0) {
e4fbbfe9 RS	374	write_or_die(1, out, compressed_size);
	375	zip_offset += compressed_size;
	376	}
	377
e4fbbfe9	378	free(deflated);
9cb513b7	379	free(buffer);
e4fbbfe9	380
ebf5374a RS	381	memcpy(zip_dir + zip_dir_offset, &dirent, ZIP_DIR_HEADER_SIZE);
	382	zip_dir_offset += ZIP_DIR_HEADER_SIZE;
	383	memcpy(zip_dir + zip_dir_offset, path, pathlen);
	384	zip_dir_offset += pathlen;
	385	zip_dir_entries++;
	386
562e25ab	387	return 0;
e4fbbfe9 RS	388	}
	389
	390	static void write_zip_trailer(const unsigned char *sha1)
	391	{
	392	struct zip_dir_trailer trailer;
	393
	394	copy_le32(trailer.magic, 0x06054b50);
	395	copy_le16(trailer.disk, 0);
	396	copy_le16(trailer.directory_start_disk, 0);
	397	copy_le16(trailer.entries_on_this_disk, zip_dir_entries);
	398	copy_le16(trailer.entries, zip_dir_entries);
	399	copy_le32(trailer.size, zip_dir_offset);
	400	copy_le32(trailer.offset, zip_offset);
	401	copy_le16(trailer.comment_length, sha1 ? 40 : 0);
	402
	403	write_or_die(1, zip_dir, zip_dir_offset);
0ea865ce	404	write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
e4fbbfe9 RS	405	if (sha1)
	406	write_or_die(1, sha1_to_hex(sha1), 40);
	407	}
	408
	409	static void dos_time(time_t time, int dos_date, int *dos_time)
	410	{
	411	struct tm *t = localtime(time);
	412
	413	dos_date = t->tm_mday + (t->tm_mon + 1) 32 +
	414	(t->tm_year + 1900 - 1980) * 512;
	415	dos_time = t->tm_sec / 2 + t->tm_min 32 + t->tm_hour * 2048;
	416	}
	417
4d7c9898 JK	418	static int write_zip_archive(const struct archiver *ar,
4d7c9898 JK	419	struct archiver_args *args)
ec06bff5	420	{
562e25ab RS	421	int err;
562e25ab RS	422
ec06bff5 FBH	423	dos_time(&args->time, &zip_date, &zip_time);
	424
	425	zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
	426	zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
562e25ab RS	427
	428	err = write_archive_entries(args, write_zip_entry);
	429	if (!err)
	430	write_zip_trailer(args->commit_sha1);
ec06bff5 FBH	431
	432	free(zip_dir);
	433
562e25ab	434	return err;
ec06bff5	435	}
13e0f88d JK	436
	437	static struct archiver zip_archiver = {
	438	"zip",
	439	write_zip_archive,
7b97730b	440	ARCHIVER_WANT_COMPRESSION_LEVELS\|ARCHIVER_REMOTE
13e0f88d JK	441	};
	442
	443	void init_zip_archiver(void)
	444	{
	445	register_archiver(&zip_archiver);
	446	}