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

/*
 * Copyright (c) 2006 Rene Scharfe
 */
#include "cache.h"
#include "archive.h"
#include "streaming.h"
#include "utf8.h"
#include "userdiff.h"
#include "xdiff-interface.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;

	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;
	}
}

static int entry_is_binary(const char *path, const void *buffer, size_t size)
{
	struct userdiff_driver *driver = userdiff_find_by_path(path);
	if (!driver)
		driver = userdiff_find_by_name("default");
	if (driver->binary != -1)
		return driver->binary;
	return buffer_is_binary(buffer, 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;
	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;
	int is_binary = -1;
	const char *path_without_prefix = path + args->baselen;

	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);
			is_binary = entry_is_binary(path_without_prefix,
						    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_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);
			if (is_binary == -1)
				is_binary = entry_is_binary(path_without_prefix,
							    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];

		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);
			if (is_binary == -1)
				is_binary = entry_is_binary(path_without_prefix,
							    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);

	copy_le16(dirent.attr1, !is_binary);

	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 ? GIT_SHA1_HEXSZ : 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), GIT_SHA1_HEXSZ);
}

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"
88182bab	7	#include "utf8.h"
4aff646d RS	8	#include "userdiff.h"
4aff646d RS	9	#include "xdiff-interface.h"
e4fbbfe9	10
e4fbbfe9 RS	11	static int zip_date;
	12	static int zip_time;
	13
	14	static unsigned char *zip_dir;
	15	static unsigned int zip_dir_size;
	16
	17	static unsigned int zip_offset;
	18	static unsigned int zip_dir_offset;
	19	static unsigned int zip_dir_entries;
	20
	21	#define ZIP_DIRECTORY_MIN_SIZE (1024 * 1024)
88182bab RS	22	#define ZIP_STREAM (1 << 3)
88182bab RS	23	#define ZIP_UTF8 (1 << 11)
e4fbbfe9 RS	24
	25	struct zip_local_header {
	26	unsigned char magic[4];
	27	unsigned char version[2];
	28	unsigned char flags[2];
	29	unsigned char compression_method[2];
	30	unsigned char mtime[2];
	31	unsigned char mdate[2];
	32	unsigned char crc32[4];
	33	unsigned char compressed_size[4];
	34	unsigned char size[4];
	35	unsigned char filename_length[2];
	36	unsigned char extra_length[2];
0ea865ce	37	unsigned char _end[1];
e4fbbfe9 RS	38	};
e4fbbfe9 RS	39
2158f883 RS	40	struct zip_data_desc {
	41	unsigned char magic[4];
	42	unsigned char crc32[4];
	43	unsigned char compressed_size[4];
	44	unsigned char size[4];
	45	unsigned char _end[1];
	46	};
	47
e4fbbfe9 RS	48	struct zip_dir_header {
	49	unsigned char magic[4];
	50	unsigned char creator_version[2];
	51	unsigned char version[2];
	52	unsigned char flags[2];
	53	unsigned char compression_method[2];
	54	unsigned char mtime[2];
	55	unsigned char mdate[2];
	56	unsigned char crc32[4];
	57	unsigned char compressed_size[4];
	58	unsigned char size[4];
	59	unsigned char filename_length[2];
	60	unsigned char extra_length[2];
	61	unsigned char comment_length[2];
	62	unsigned char disk[2];
	63	unsigned char attr1[2];
	64	unsigned char attr2[4];
	65	unsigned char offset[4];
0ea865ce	66	unsigned char _end[1];
e4fbbfe9 RS	67	};
	68
	69	struct zip_dir_trailer {
	70	unsigned char magic[4];
	71	unsigned char disk[2];
	72	unsigned char directory_start_disk[2];
	73	unsigned char entries_on_this_disk[2];
	74	unsigned char entries[2];
	75	unsigned char size[4];
	76	unsigned char offset[4];
	77	unsigned char comment_length[2];
0ea865ce	78	unsigned char _end[1];
e4fbbfe9 RS	79	};
e4fbbfe9 RS	80
227bf598 RS	81	struct zip_extra_mtime {
	82	unsigned char magic[2];
	83	unsigned char extra_size[2];
	84	unsigned char flags[1];
	85	unsigned char mtime[4];
	86	unsigned char _end[1];
	87	};
	88
0ea865ce RS	89	/*
	90	* On ARM, padding is added at the end of the struct, so a simple
	91	* sizeof(struct ...) reports two bytes more than the payload size
	92	* we're interested in.
	93	*/
	94	#define ZIP_LOCAL_HEADER_SIZE offsetof(struct zip_local_header, _end)
2158f883	95	#define ZIP_DATA_DESC_SIZE offsetof(struct zip_data_desc, _end)
0ea865ce RS	96	#define ZIP_DIR_HEADER_SIZE offsetof(struct zip_dir_header, _end)
0ea865ce RS	97	#define ZIP_DIR_TRAILER_SIZE offsetof(struct zip_dir_trailer, _end)
227bf598 RS	98	#define ZIP_EXTRA_MTIME_SIZE offsetof(struct zip_extra_mtime, _end)
	99	#define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
	100	(ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
0ea865ce	101
e4fbbfe9 RS	102	static void copy_le16(unsigned char *dest, unsigned int n)
	103	{
	104	dest[0] = 0xff & n;
	105	dest[1] = 0xff & (n >> 010);
	106	}
	107
	108	static void copy_le32(unsigned char *dest, unsigned int n)
	109	{
	110	dest[0] = 0xff & n;
	111	dest[1] = 0xff & (n >> 010);
	112	dest[2] = 0xff & (n >> 020);
	113	dest[3] = 0xff & (n >> 030);
	114	}
	115
c3c2e1a0 RS	116	static void zlib_deflate_raw(void data, unsigned long size,
	117	int compression_level,
	118	unsigned long *compressed_size)
e4fbbfe9	119	{
ef49a7a0	120	git_zstream stream;
e4fbbfe9 RS	121	unsigned long maxsize;
	122	void *buffer;
	123	int result;
	124
c3c2e1a0	125	git_deflate_init_raw(&stream, compression_level);
225a6f10	126	maxsize = git_deflate_bound(&stream, size);
e4fbbfe9 RS	127	buffer = xmalloc(maxsize);
	128
	129	stream.next_in = data;
	130	stream.avail_in = size;
	131	stream.next_out = buffer;
	132	stream.avail_out = maxsize;
	133
	134	do {
55bb5c91	135	result = git_deflate(&stream, Z_FINISH);
e4fbbfe9 RS	136	} while (result == Z_OK);
	137
	138	if (result != Z_STREAM_END) {
	139	free(buffer);
	140	return NULL;
	141	}
	142
55bb5c91	143	git_deflate_end(&stream);
e4fbbfe9 RS	144	*compressed_size = stream.total_out;
	145
	146	return buffer;
	147	}
	148
2158f883 RS	149	static void write_zip_data_desc(unsigned long size,
	150	unsigned long compressed_size,
	151	unsigned long crc)
	152	{
	153	struct zip_data_desc trailer;
	154
	155	copy_le32(trailer.magic, 0x08074b50);
	156	copy_le32(trailer.crc32, crc);
	157	copy_le32(trailer.compressed_size, compressed_size);
	158	copy_le32(trailer.size, size);
	159	write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
	160	}
	161
ebf5374a RS	162	static void set_zip_dir_data_desc(struct zip_dir_header *header,
	163	unsigned long size,
	164	unsigned long compressed_size,
	165	unsigned long crc)
	166	{
	167	copy_le32(header->crc32, crc);
	168	copy_le32(header->compressed_size, compressed_size);
	169	copy_le32(header->size, size);
	170	}
	171
	172	static void set_zip_header_data_desc(struct zip_local_header *header,
	173	unsigned long size,
	174	unsigned long compressed_size,
	175	unsigned long crc)
	176	{
	177	copy_le32(header->crc32, crc);
	178	copy_le32(header->compressed_size, compressed_size);
	179	copy_le32(header->size, size);
	180	}
	181
88182bab RS	182	static int has_only_ascii(const char *s)
	183	{
	184	for (;;) {
	185	int c = *s++;
	186	if (c == '\0')
	187	return 1;
	188	if (!isascii(c))
	189	return 0;
	190	}
	191	}
	192
4aff646d RS	193	static int entry_is_binary(const char path, const void buffer, size_t size)
	194	{
	195	struct userdiff_driver *driver = userdiff_find_by_path(path);
	196	if (!driver)
	197	driver = userdiff_find_by_name("default");
	198	if (driver->binary != -1)
	199	return driver->binary;
	200	return buffer_is_binary(buffer, size);
	201	}
	202
2158f883 RS	203	#define STREAM_BUFFER_SIZE (1024 * 16)
2158f883 RS	204
562e25ab	205	static int write_zip_entry(struct archiver_args *args,
9cb513b7 NTND	206	const unsigned char *sha1,
	207	const char *path, size_t pathlen,
	208	unsigned int mode)
e4fbbfe9 RS	209	{
	210	struct zip_local_header header;
	211	struct zip_dir_header dirent;
227bf598	212	struct zip_extra_mtime extra;
bb52d22e	213	unsigned long attr2;
e4fbbfe9	214	unsigned long compressed_size;
e4fbbfe9 RS	215	unsigned long crc;
e4fbbfe9 RS	216	unsigned long direntsize;
e4fbbfe9	217	int method;
e4fbbfe9	218	unsigned char *out;
e4fbbfe9	219	void *deflated = NULL;
9cb513b7	220	void *buffer;
2158f883 RS	221	struct git_istream *stream = NULL;
2158f883 RS	222	unsigned long flags = 0;
9cb513b7	223	unsigned long size;
4aff646d RS	224	int is_binary = -1;
4aff646d RS	225	const char *path_without_prefix = path + args->baselen;
e4fbbfe9	226
38f4d138	227	crc = crc32(0, NULL, 0);
e4fbbfe9	228
88182bab RS	229	if (!has_only_ascii(path)) {
	230	if (is_utf8(path))
	231	flags \|= ZIP_UTF8;
	232	else
	233	warning("Path is not valid UTF-8: %s", path);
	234	}
	235
e4fbbfe9	236	if (pathlen > 0xffff) {
562e25ab RS	237	return error("path too long (%d chars, SHA1: %s): %s",
562e25ab RS	238	(int)pathlen, sha1_to_hex(sha1), path);
e4fbbfe9 RS	239	}
e4fbbfe9 RS	240
302b9282	241	if (S_ISDIR(mode) \|\| S_ISGITLINK(mode)) {
e4fbbfe9	242	method = 0;
62cdce17	243	attr2 = 16;
e4fbbfe9	244	out = NULL;
60df6bd1	245	size = 0;
e4fbbfe9	246	compressed_size = 0;
9cb513b7	247	buffer = NULL;
62cdce17	248	} else if (S_ISREG(mode) \|\| S_ISLNK(mode)) {
2158f883	249	enum object_type type = sha1_object_info(sha1, &size);
9cb513b7	250
62cdce17	251	method = 0;
bb52d22e JH	252	attr2 = S_ISLNK(mode) ? ((mode \| 0777) << 16) :
bb52d22e JH	253	(mode & 0111) ? ((mode) << 16) : 0;
2158f883	254	if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
62cdce17	255	method = 8;
2158f883 RS	256
2158f883 RS	257	if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
c743c215	258	size > big_file_threshold) {
2158f883 RS	259	stream = open_istream(sha1, &type, &size, NULL);
	260	if (!stream)
	261	return error("cannot stream blob %s",
	262	sha1_to_hex(sha1));
	263	flags \|= ZIP_STREAM;
	264	out = buffer = NULL;
	265	} else {
	266	buffer = sha1_file_to_archive(args, path, sha1, mode,
	267	&type, &size);
	268	if (!buffer)
	269	return error("cannot read %s",
	270	sha1_to_hex(sha1));
	271	crc = crc32(crc, buffer, size);
4aff646d RS	272	is_binary = entry_is_binary(path_without_prefix,
4aff646d RS	273	buffer, size);
2158f883 RS	274	out = buffer;
2158f883 RS	275	}
d3c1472f	276	compressed_size = (method == 0) ? size : 0;
e4fbbfe9	277	} else {
562e25ab RS	278	return error("unsupported file mode: 0%o (SHA1: %s)", mode,
562e25ab RS	279	sha1_to_hex(sha1));
e4fbbfe9 RS	280	}
e4fbbfe9 RS	281
2158f883	282	if (buffer && method == 8) {
c3c2e1a0 RS	283	out = deflated = zlib_deflate_raw(buffer, size,
	284	args->compression_level,
	285	&compressed_size);
	286	if (!out \|\| compressed_size >= size) {
	287	out = buffer;
e4fbbfe9 RS	288	method = 0;
	289	compressed_size = size;
	290	}
	291	}
	292
227bf598 RS	293	copy_le16(extra.magic, 0x5455);
	294	copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
	295	extra.flags[0] = 1; /* just mtime */
	296	copy_le32(extra.mtime, args->time);
	297
e4fbbfe9	298	/* make sure we have enough free space in the dictionary */
227bf598	299	direntsize = ZIP_DIR_HEADER_SIZE + pathlen + ZIP_EXTRA_MTIME_SIZE;
e4fbbfe9 RS	300	while (zip_dir_size < zip_dir_offset + direntsize) {
	301	zip_dir_size += ZIP_DIRECTORY_MIN_SIZE;
	302	zip_dir = xrealloc(zip_dir, zip_dir_size);
	303	}
	304
	305	copy_le32(dirent.magic, 0x02014b50);
bb52d22e JH	306	copy_le16(dirent.creator_version,
bb52d22e JH	307	S_ISLNK(mode) \|\| (S_ISREG(mode) && (mode & 0111)) ? 0x0317 : 0);
cf72fb07	308	copy_le16(dirent.version, 10);
2158f883	309	copy_le16(dirent.flags, flags);
e4fbbfe9 RS	310	copy_le16(dirent.compression_method, method);
	311	copy_le16(dirent.mtime, zip_time);
	312	copy_le16(dirent.mdate, zip_date);
ebf5374a	313	set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
e4fbbfe9	314	copy_le16(dirent.filename_length, pathlen);
227bf598	315	copy_le16(dirent.extra_length, ZIP_EXTRA_MTIME_SIZE);
e4fbbfe9 RS	316	copy_le16(dirent.comment_length, 0);
e4fbbfe9 RS	317	copy_le16(dirent.disk, 0);
62cdce17	318	copy_le32(dirent.attr2, attr2);
e4fbbfe9	319	copy_le32(dirent.offset, zip_offset);
e4fbbfe9 RS	320
e4fbbfe9 RS	321	copy_le32(header.magic, 0x04034b50);
cf72fb07	322	copy_le16(header.version, 10);
2158f883	323	copy_le16(header.flags, flags);
e4fbbfe9 RS	324	copy_le16(header.compression_method, method);
	325	copy_le16(header.mtime, zip_time);
	326	copy_le16(header.mdate, zip_date);
5ea2c847	327	set_zip_header_data_desc(&header, size, compressed_size, crc);
e4fbbfe9	328	copy_le16(header.filename_length, pathlen);
227bf598	329	copy_le16(header.extra_length, ZIP_EXTRA_MTIME_SIZE);
0ea865ce RS	330	write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
0ea865ce RS	331	zip_offset += ZIP_LOCAL_HEADER_SIZE;
e4fbbfe9 RS	332	write_or_die(1, path, pathlen);
e4fbbfe9 RS	333	zip_offset += pathlen;
227bf598 RS	334	write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
227bf598 RS	335	zip_offset += ZIP_EXTRA_MTIME_SIZE;
2158f883 RS	336	if (stream && method == 0) {
	337	unsigned char buf[STREAM_BUFFER_SIZE];
	338	ssize_t readlen;
	339
	340	for (;;) {
	341	readlen = read_istream(stream, buf, sizeof(buf));
	342	if (readlen <= 0)
	343	break;
	344	crc = crc32(crc, buf, readlen);
4aff646d RS	345	if (is_binary == -1)
	346	is_binary = entry_is_binary(path_without_prefix,
	347	buf, readlen);
2158f883 RS	348	write_or_die(1, buf, readlen);
	349	}
	350	close_istream(stream);
	351	if (readlen)
	352	return readlen;
	353
	354	compressed_size = size;
	355	zip_offset += compressed_size;
	356
	357	write_zip_data_desc(size, compressed_size, crc);
	358	zip_offset += ZIP_DATA_DESC_SIZE;
	359
c743c215 RS	360	set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
	361	} else if (stream && method == 8) {
	362	unsigned char buf[STREAM_BUFFER_SIZE];
	363	ssize_t readlen;
	364	git_zstream zstream;
	365	int result;
	366	size_t out_len;
	367	unsigned char compressed[STREAM_BUFFER_SIZE * 2];
	368
c3c2e1a0	369	git_deflate_init_raw(&zstream, args->compression_level);
c743c215 RS	370
	371	compressed_size = 0;
	372	zstream.next_out = compressed;
	373	zstream.avail_out = sizeof(compressed);
	374
	375	for (;;) {
	376	readlen = read_istream(stream, buf, sizeof(buf));
	377	if (readlen <= 0)
	378	break;
	379	crc = crc32(crc, buf, readlen);
4aff646d RS	380	if (is_binary == -1)
	381	is_binary = entry_is_binary(path_without_prefix,
	382	buf, readlen);
c743c215 RS	383
	384	zstream.next_in = buf;
	385	zstream.avail_in = readlen;
	386	result = git_deflate(&zstream, 0);
	387	if (result != Z_OK)
	388	die("deflate error (%d)", result);
c3c2e1a0	389	out_len = zstream.next_out - compressed;
c743c215 RS	390
c743c215 RS	391	if (out_len > 0) {
c3c2e1a0	392	write_or_die(1, compressed, out_len);
c743c215 RS	393	compressed_size += out_len;
	394	zstream.next_out = compressed;
	395	zstream.avail_out = sizeof(compressed);
	396	}
	397
	398	}
	399	close_istream(stream);
	400	if (readlen)
	401	return readlen;
	402
	403	zstream.next_in = buf;
	404	zstream.avail_in = 0;
	405	result = git_deflate(&zstream, Z_FINISH);
	406	if (result != Z_STREAM_END)
	407	die("deflate error (%d)", result);
	408
	409	git_deflate_end(&zstream);
c3c2e1a0 RS	410	out_len = zstream.next_out - compressed;
c3c2e1a0 RS	411	write_or_die(1, compressed, out_len);
c743c215 RS	412	compressed_size += out_len;
	413	zip_offset += compressed_size;
	414
	415	write_zip_data_desc(size, compressed_size, crc);
	416	zip_offset += ZIP_DATA_DESC_SIZE;
	417
2158f883 RS	418	set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
2158f883 RS	419	} else if (compressed_size > 0) {
e4fbbfe9 RS	420	write_or_die(1, out, compressed_size);
	421	zip_offset += compressed_size;
	422	}
	423
e4fbbfe9	424	free(deflated);
9cb513b7	425	free(buffer);
e4fbbfe9	426
4aff646d RS	427	copy_le16(dirent.attr1, !is_binary);
4aff646d RS	428
ebf5374a RS	429	memcpy(zip_dir + zip_dir_offset, &dirent, ZIP_DIR_HEADER_SIZE);
	430	zip_dir_offset += ZIP_DIR_HEADER_SIZE;
	431	memcpy(zip_dir + zip_dir_offset, path, pathlen);
	432	zip_dir_offset += pathlen;
227bf598 RS	433	memcpy(zip_dir + zip_dir_offset, &extra, ZIP_EXTRA_MTIME_SIZE);
227bf598 RS	434	zip_dir_offset += ZIP_EXTRA_MTIME_SIZE;
ebf5374a RS	435	zip_dir_entries++;
ebf5374a RS	436
562e25ab	437	return 0;
e4fbbfe9 RS	438	}
	439
	440	static void write_zip_trailer(const unsigned char *sha1)
	441	{
	442	struct zip_dir_trailer trailer;
	443
	444	copy_le32(trailer.magic, 0x06054b50);
	445	copy_le16(trailer.disk, 0);
	446	copy_le16(trailer.directory_start_disk, 0);
	447	copy_le16(trailer.entries_on_this_disk, zip_dir_entries);
	448	copy_le16(trailer.entries, zip_dir_entries);
	449	copy_le32(trailer.size, zip_dir_offset);
	450	copy_le32(trailer.offset, zip_offset);
aeecdcd4	451	copy_le16(trailer.comment_length, sha1 ? GIT_SHA1_HEXSZ : 0);
e4fbbfe9 RS	452
e4fbbfe9 RS	453	write_or_die(1, zip_dir, zip_dir_offset);
0ea865ce	454	write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
e4fbbfe9	455	if (sha1)
aeecdcd4	456	write_or_die(1, sha1_to_hex(sha1), GIT_SHA1_HEXSZ);
e4fbbfe9 RS	457	}
	458
	459	static void dos_time(time_t time, int dos_date, int *dos_time)
	460	{
	461	struct tm *t = localtime(time);
	462
	463	dos_date = t->tm_mday + (t->tm_mon + 1) 32 +
	464	(t->tm_year + 1900 - 1980) * 512;
	465	dos_time = t->tm_sec / 2 + t->tm_min 32 + t->tm_hour * 2048;
	466	}
	467
4d7c9898 JK	468	static int write_zip_archive(const struct archiver *ar,
4d7c9898 JK	469	struct archiver_args *args)
ec06bff5	470	{
562e25ab RS	471	int err;
562e25ab RS	472
ec06bff5 FBH	473	dos_time(&args->time, &zip_date, &zip_time);
	474
	475	zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
	476	zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
562e25ab RS	477
	478	err = write_archive_entries(args, write_zip_entry);
	479	if (!err)
	480	write_zip_trailer(args->commit_sha1);
ec06bff5 FBH	481
	482	free(zip_dir);
	483
562e25ab	484	return err;
ec06bff5	485	}
13e0f88d JK	486
	487	static struct archiver zip_archiver = {
	488	"zip",
	489	write_zip_archive,
7b97730b	490	ARCHIVER_WANT_COMPRESSION_LEVELS\|ARCHIVER_REMOTE
13e0f88d JK	491	};
	492
	493	void init_zip_archiver(void)
	494	{
	495	register_archiver(&zip_archiver);
	496	}