[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;
	unsigned int creator_version = 0;

	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_ISLNK(mode) || (mode & 0111))
			creator_version = 0x0317;
		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, creator_version);
	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 ? 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"
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;
0f747f9d	226	unsigned int creator_version = 0;
e4fbbfe9	227
38f4d138	228	crc = crc32(0, NULL, 0);
e4fbbfe9	229
88182bab RS	230	if (!has_only_ascii(path)) {
	231	if (is_utf8(path))
	232	flags \|= ZIP_UTF8;
	233	else
	234	warning("Path is not valid UTF-8: %s", path);
	235	}
	236
e4fbbfe9	237	if (pathlen > 0xffff) {
562e25ab RS	238	return error("path too long (%d chars, SHA1: %s): %s",
562e25ab RS	239	(int)pathlen, sha1_to_hex(sha1), path);
e4fbbfe9 RS	240	}
e4fbbfe9 RS	241
302b9282	242	if (S_ISDIR(mode) \|\| S_ISGITLINK(mode)) {
e4fbbfe9	243	method = 0;
62cdce17	244	attr2 = 16;
e4fbbfe9	245	out = NULL;
60df6bd1	246	size = 0;
e4fbbfe9	247	compressed_size = 0;
9cb513b7	248	buffer = NULL;
62cdce17	249	} else if (S_ISREG(mode) \|\| S_ISLNK(mode)) {
2158f883	250	enum object_type type = sha1_object_info(sha1, &size);
9cb513b7	251
62cdce17	252	method = 0;
bb52d22e JH	253	attr2 = S_ISLNK(mode) ? ((mode \| 0777) << 16) :
bb52d22e JH	254	(mode & 0111) ? ((mode) << 16) : 0;
0f747f9d RS	255	if (S_ISLNK(mode) \|\| (mode & 0111))
0f747f9d RS	256	creator_version = 0x0317;
2158f883	257	if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
62cdce17	258	method = 8;
2158f883 RS	259
2158f883 RS	260	if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
c743c215	261	size > big_file_threshold) {
2158f883 RS	262	stream = open_istream(sha1, &type, &size, NULL);
	263	if (!stream)
	264	return error("cannot stream blob %s",
	265	sha1_to_hex(sha1));
	266	flags \|= ZIP_STREAM;
	267	out = buffer = NULL;
	268	} else {
	269	buffer = sha1_file_to_archive(args, path, sha1, mode,
	270	&type, &size);
	271	if (!buffer)
	272	return error("cannot read %s",
	273	sha1_to_hex(sha1));
	274	crc = crc32(crc, buffer, size);
4aff646d RS	275	is_binary = entry_is_binary(path_without_prefix,
4aff646d RS	276	buffer, size);
2158f883 RS	277	out = buffer;
2158f883 RS	278	}
d3c1472f	279	compressed_size = (method == 0) ? size : 0;
e4fbbfe9	280	} else {
562e25ab RS	281	return error("unsupported file mode: 0%o (SHA1: %s)", mode,
562e25ab RS	282	sha1_to_hex(sha1));
e4fbbfe9 RS	283	}
e4fbbfe9 RS	284
2158f883	285	if (buffer && method == 8) {
c3c2e1a0 RS	286	out = deflated = zlib_deflate_raw(buffer, size,
	287	args->compression_level,
	288	&compressed_size);
	289	if (!out \|\| compressed_size >= size) {
	290	out = buffer;
e4fbbfe9 RS	291	method = 0;
	292	compressed_size = size;
	293	}
	294	}
	295
227bf598 RS	296	copy_le16(extra.magic, 0x5455);
	297	copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
	298	extra.flags[0] = 1; /* just mtime */
	299	copy_le32(extra.mtime, args->time);
	300
e4fbbfe9	301	/* make sure we have enough free space in the dictionary */
227bf598	302	direntsize = ZIP_DIR_HEADER_SIZE + pathlen + ZIP_EXTRA_MTIME_SIZE;
e4fbbfe9 RS	303	while (zip_dir_size < zip_dir_offset + direntsize) {
	304	zip_dir_size += ZIP_DIRECTORY_MIN_SIZE;
	305	zip_dir = xrealloc(zip_dir, zip_dir_size);
	306	}
	307
	308	copy_le32(dirent.magic, 0x02014b50);
0f747f9d	309	copy_le16(dirent.creator_version, creator_version);
cf72fb07	310	copy_le16(dirent.version, 10);
2158f883	311	copy_le16(dirent.flags, flags);
e4fbbfe9 RS	312	copy_le16(dirent.compression_method, method);
	313	copy_le16(dirent.mtime, zip_time);
	314	copy_le16(dirent.mdate, zip_date);
ebf5374a	315	set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
e4fbbfe9	316	copy_le16(dirent.filename_length, pathlen);
227bf598	317	copy_le16(dirent.extra_length, ZIP_EXTRA_MTIME_SIZE);
e4fbbfe9 RS	318	copy_le16(dirent.comment_length, 0);
e4fbbfe9 RS	319	copy_le16(dirent.disk, 0);
62cdce17	320	copy_le32(dirent.attr2, attr2);
e4fbbfe9	321	copy_le32(dirent.offset, zip_offset);
e4fbbfe9 RS	322
e4fbbfe9 RS	323	copy_le32(header.magic, 0x04034b50);
cf72fb07	324	copy_le16(header.version, 10);
2158f883	325	copy_le16(header.flags, flags);
e4fbbfe9 RS	326	copy_le16(header.compression_method, method);
	327	copy_le16(header.mtime, zip_time);
	328	copy_le16(header.mdate, zip_date);
5ea2c847	329	set_zip_header_data_desc(&header, size, compressed_size, crc);
e4fbbfe9	330	copy_le16(header.filename_length, pathlen);
227bf598	331	copy_le16(header.extra_length, ZIP_EXTRA_MTIME_SIZE);
0ea865ce RS	332	write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
0ea865ce RS	333	zip_offset += ZIP_LOCAL_HEADER_SIZE;
e4fbbfe9 RS	334	write_or_die(1, path, pathlen);
e4fbbfe9 RS	335	zip_offset += pathlen;
227bf598 RS	336	write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
227bf598 RS	337	zip_offset += ZIP_EXTRA_MTIME_SIZE;
2158f883 RS	338	if (stream && method == 0) {
	339	unsigned char buf[STREAM_BUFFER_SIZE];
	340	ssize_t readlen;
	341
	342	for (;;) {
	343	readlen = read_istream(stream, buf, sizeof(buf));
	344	if (readlen <= 0)
	345	break;
	346	crc = crc32(crc, buf, readlen);
4aff646d RS	347	if (is_binary == -1)
	348	is_binary = entry_is_binary(path_without_prefix,
	349	buf, readlen);
2158f883 RS	350	write_or_die(1, buf, readlen);
	351	}
	352	close_istream(stream);
	353	if (readlen)
	354	return readlen;
	355
	356	compressed_size = size;
	357	zip_offset += compressed_size;
	358
	359	write_zip_data_desc(size, compressed_size, crc);
	360	zip_offset += ZIP_DATA_DESC_SIZE;
	361
c743c215 RS	362	set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
	363	} else if (stream && method == 8) {
	364	unsigned char buf[STREAM_BUFFER_SIZE];
	365	ssize_t readlen;
	366	git_zstream zstream;
	367	int result;
	368	size_t out_len;
	369	unsigned char compressed[STREAM_BUFFER_SIZE * 2];
	370
c3c2e1a0	371	git_deflate_init_raw(&zstream, args->compression_level);
c743c215 RS	372
	373	compressed_size = 0;
	374	zstream.next_out = compressed;
	375	zstream.avail_out = sizeof(compressed);
	376
	377	for (;;) {
	378	readlen = read_istream(stream, buf, sizeof(buf));
	379	if (readlen <= 0)
	380	break;
	381	crc = crc32(crc, buf, readlen);
4aff646d RS	382	if (is_binary == -1)
	383	is_binary = entry_is_binary(path_without_prefix,
	384	buf, readlen);
c743c215 RS	385
	386	zstream.next_in = buf;
	387	zstream.avail_in = readlen;
	388	result = git_deflate(&zstream, 0);
	389	if (result != Z_OK)
	390	die("deflate error (%d)", result);
c3c2e1a0	391	out_len = zstream.next_out - compressed;
c743c215 RS	392
c743c215 RS	393	if (out_len > 0) {
c3c2e1a0	394	write_or_die(1, compressed, out_len);
c743c215 RS	395	compressed_size += out_len;
	396	zstream.next_out = compressed;
	397	zstream.avail_out = sizeof(compressed);
	398	}
	399
	400	}
	401	close_istream(stream);
	402	if (readlen)
	403	return readlen;
	404
	405	zstream.next_in = buf;
	406	zstream.avail_in = 0;
	407	result = git_deflate(&zstream, Z_FINISH);
	408	if (result != Z_STREAM_END)
	409	die("deflate error (%d)", result);
	410
	411	git_deflate_end(&zstream);
c3c2e1a0 RS	412	out_len = zstream.next_out - compressed;
c3c2e1a0 RS	413	write_or_die(1, compressed, out_len);
c743c215 RS	414	compressed_size += out_len;
	415	zip_offset += compressed_size;
	416
	417	write_zip_data_desc(size, compressed_size, crc);
	418	zip_offset += ZIP_DATA_DESC_SIZE;
	419
2158f883 RS	420	set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
2158f883 RS	421	} else if (compressed_size > 0) {
e4fbbfe9 RS	422	write_or_die(1, out, compressed_size);
	423	zip_offset += compressed_size;
	424	}
	425
e4fbbfe9	426	free(deflated);
9cb513b7	427	free(buffer);
e4fbbfe9	428
4aff646d RS	429	copy_le16(dirent.attr1, !is_binary);
4aff646d RS	430
ebf5374a RS	431	memcpy(zip_dir + zip_dir_offset, &dirent, ZIP_DIR_HEADER_SIZE);
	432	zip_dir_offset += ZIP_DIR_HEADER_SIZE;
	433	memcpy(zip_dir + zip_dir_offset, path, pathlen);
	434	zip_dir_offset += pathlen;
227bf598 RS	435	memcpy(zip_dir + zip_dir_offset, &extra, ZIP_EXTRA_MTIME_SIZE);
227bf598 RS	436	zip_dir_offset += ZIP_EXTRA_MTIME_SIZE;
ebf5374a RS	437	zip_dir_entries++;
ebf5374a RS	438
562e25ab	439	return 0;
e4fbbfe9 RS	440	}
	441
	442	static void write_zip_trailer(const unsigned char *sha1)
	443	{
	444	struct zip_dir_trailer trailer;
	445
	446	copy_le32(trailer.magic, 0x06054b50);
	447	copy_le16(trailer.disk, 0);
	448	copy_le16(trailer.directory_start_disk, 0);
	449	copy_le16(trailer.entries_on_this_disk, zip_dir_entries);
	450	copy_le16(trailer.entries, zip_dir_entries);
	451	copy_le32(trailer.size, zip_dir_offset);
	452	copy_le32(trailer.offset, zip_offset);
	453	copy_le16(trailer.comment_length, sha1 ? 40 : 0);
	454
	455	write_or_die(1, zip_dir, zip_dir_offset);
0ea865ce	456	write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
e4fbbfe9 RS	457	if (sha1)
	458	write_or_die(1, sha1_to_hex(sha1), 40);
	459	}
	460
	461	static void dos_time(time_t time, int dos_date, int *dos_time)
	462	{
	463	struct tm *t = localtime(time);
	464
	465	dos_date = t->tm_mday + (t->tm_mon + 1) 32 +
	466	(t->tm_year + 1900 - 1980) * 512;
	467	dos_time = t->tm_sec / 2 + t->tm_min 32 + t->tm_hour * 2048;
	468	}
	469
4d7c9898 JK	470	static int write_zip_archive(const struct archiver *ar,
4d7c9898 JK	471	struct archiver_args *args)
ec06bff5	472	{
562e25ab RS	473	int err;
562e25ab RS	474
ec06bff5 FBH	475	dos_time(&args->time, &zip_date, &zip_time);
	476
	477	zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
	478	zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
562e25ab RS	479
	480	err = write_archive_entries(args, write_zip_entry);
	481	if (!err)
	482	write_zip_trailer(args->commit_sha1);
ec06bff5 FBH	483
	484	free(zip_dir);
	485
562e25ab	486	return err;
ec06bff5	487	}
13e0f88d JK	488
	489	static struct archiver zip_archiver = {
	490	"zip",
	491	write_zip_archive,
7b97730b	492	ARCHIVER_WANT_COMPRESSION_LEVELS\|ARCHIVER_REMOTE
13e0f88d JK	493	};
	494
	495	void init_zip_archiver(void)
	496	{
	497	register_archiver(&zip_archiver);
	498	}