[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 uint64_t zip_dir_entries;

static unsigned int max_creator_version;

#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];
};

struct zip64_dir_trailer {
	unsigned char magic[4];
	unsigned char record_size[8];
	unsigned char creator_version[2];
	unsigned char version[2];
	unsigned char disk[4];
	unsigned char directory_start_disk[4];
	unsigned char entries_on_this_disk[8];
	unsigned char entries[8];
	unsigned char size[8];
	unsigned char offset[8];
	unsigned char _end[1];
};

struct zip64_dir_trailer_locator {
	unsigned char magic[4];
	unsigned char disk[4];
	unsigned char offset[8];
	unsigned char number_of_disks[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))
#define ZIP64_DIR_TRAILER_SIZE	offsetof(struct zip64_dir_trailer, _end)
#define ZIP64_DIR_TRAILER_RECORD_SIZE \
	(ZIP64_DIR_TRAILER_SIZE - \
	 offsetof(struct zip64_dir_trailer, creator_version))
#define ZIP64_DIR_TRAILER_LOCATOR_SIZE \
	offsetof(struct zip64_dir_trailer_locator, _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 copy_le64(unsigned char *dest, uint64_t n)
{
	dest[0] = 0xff & n;
	dest[1] = 0xff & (n >> 010);
	dest[2] = 0xff & (n >> 020);
	dest[3] = 0xff & (n >> 030);
	dest[4] = 0xff & (n >> 040);
	dest[5] = 0xff & (n >> 050);
	dest[6] = 0xff & (n >> 060);
	dest[7] = 0xff & (n >> 070);
}

static uint64_t clamp_max(uint64_t n, uint64_t max, int *clamped)
{
	if (n <= max)
		return n;
	*clamped = 1;
	return max;
}

static void copy_le16_clamp(unsigned char *dest, uint64_t n, int *clamped)
{
	copy_le16(dest, clamp_max(n, 0xffff, clamped));
}

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 (creator_version > max_creator_version)
		max_creator_version = creator_version;

	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_zip64_trailer(void)
{
	struct zip64_dir_trailer trailer64;
	struct zip64_dir_trailer_locator locator64;

	copy_le32(trailer64.magic, 0x06064b50);
	copy_le64(trailer64.record_size, ZIP64_DIR_TRAILER_RECORD_SIZE);
	copy_le16(trailer64.creator_version, max_creator_version);
	copy_le16(trailer64.version, 45);
	copy_le32(trailer64.disk, 0);
	copy_le32(trailer64.directory_start_disk, 0);
	copy_le64(trailer64.entries_on_this_disk, zip_dir_entries);
	copy_le64(trailer64.entries, zip_dir_entries);
	copy_le64(trailer64.size, zip_dir_offset);
	copy_le64(trailer64.offset, zip_offset);

	copy_le32(locator64.magic, 0x07064b50);
	copy_le32(locator64.disk, 0);
	copy_le64(locator64.offset, zip_offset + zip_dir_offset);
	copy_le32(locator64.number_of_disks, 1);

	write_or_die(1, &trailer64, ZIP64_DIR_TRAILER_SIZE);
	write_or_die(1, &locator64, ZIP64_DIR_TRAILER_LOCATOR_SIZE);
}

static void write_zip_trailer(const unsigned char *sha1)
{
	struct zip_dir_trailer trailer;
	int clamped = 0;

	copy_le32(trailer.magic, 0x06054b50);
	copy_le16(trailer.disk, 0);
	copy_le16(trailer.directory_start_disk, 0);
	copy_le16_clamp(trailer.entries_on_this_disk, zip_dir_entries,
			&clamped);
	copy_le16_clamp(trailer.entries, zip_dir_entries, &clamped);
	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);
	if (clamped)
		write_zip64_trailer();
	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;
88329ca8 RS	19	static uint64_t zip_dir_entries;
	20
	21	static unsigned int max_creator_version;
e4fbbfe9 RS	22
e4fbbfe9 RS	23	#define ZIP_DIRECTORY_MIN_SIZE (1024 * 1024)
88182bab RS	24	#define ZIP_STREAM (1 << 3)
88182bab RS	25	#define ZIP_UTF8 (1 << 11)
e4fbbfe9 RS	26
	27	struct zip_local_header {
	28	unsigned char magic[4];
	29	unsigned char version[2];
	30	unsigned char flags[2];
	31	unsigned char compression_method[2];
	32	unsigned char mtime[2];
	33	unsigned char mdate[2];
	34	unsigned char crc32[4];
	35	unsigned char compressed_size[4];
	36	unsigned char size[4];
	37	unsigned char filename_length[2];
	38	unsigned char extra_length[2];
0ea865ce	39	unsigned char _end[1];
e4fbbfe9 RS	40	};
e4fbbfe9 RS	41
2158f883 RS	42	struct zip_data_desc {
	43	unsigned char magic[4];
	44	unsigned char crc32[4];
	45	unsigned char compressed_size[4];
	46	unsigned char size[4];
	47	unsigned char _end[1];
	48	};
	49
e4fbbfe9 RS	50	struct zip_dir_header {
	51	unsigned char magic[4];
	52	unsigned char creator_version[2];
	53	unsigned char version[2];
	54	unsigned char flags[2];
	55	unsigned char compression_method[2];
	56	unsigned char mtime[2];
	57	unsigned char mdate[2];
	58	unsigned char crc32[4];
	59	unsigned char compressed_size[4];
	60	unsigned char size[4];
	61	unsigned char filename_length[2];
	62	unsigned char extra_length[2];
	63	unsigned char comment_length[2];
	64	unsigned char disk[2];
	65	unsigned char attr1[2];
	66	unsigned char attr2[4];
	67	unsigned char offset[4];
0ea865ce	68	unsigned char _end[1];
e4fbbfe9 RS	69	};
	70
	71	struct zip_dir_trailer {
	72	unsigned char magic[4];
	73	unsigned char disk[2];
	74	unsigned char directory_start_disk[2];
	75	unsigned char entries_on_this_disk[2];
	76	unsigned char entries[2];
	77	unsigned char size[4];
	78	unsigned char offset[4];
	79	unsigned char comment_length[2];
0ea865ce	80	unsigned char _end[1];
e4fbbfe9 RS	81	};
e4fbbfe9 RS	82
227bf598 RS	83	struct zip_extra_mtime {
	84	unsigned char magic[2];
	85	unsigned char extra_size[2];
	86	unsigned char flags[1];
	87	unsigned char mtime[4];
	88	unsigned char _end[1];
	89	};
	90
88329ca8 RS	91	struct zip64_dir_trailer {
	92	unsigned char magic[4];
	93	unsigned char record_size[8];
	94	unsigned char creator_version[2];
	95	unsigned char version[2];
	96	unsigned char disk[4];
	97	unsigned char directory_start_disk[4];
	98	unsigned char entries_on_this_disk[8];
	99	unsigned char entries[8];
	100	unsigned char size[8];
	101	unsigned char offset[8];
	102	unsigned char _end[1];
	103	};
	104
	105	struct zip64_dir_trailer_locator {
	106	unsigned char magic[4];
	107	unsigned char disk[4];
	108	unsigned char offset[8];
	109	unsigned char number_of_disks[4];
	110	unsigned char _end[1];
	111	};
	112
0ea865ce RS	113	/*
	114	* On ARM, padding is added at the end of the struct, so a simple
	115	* sizeof(struct ...) reports two bytes more than the payload size
	116	* we're interested in.
	117	*/
	118	#define ZIP_LOCAL_HEADER_SIZE offsetof(struct zip_local_header, _end)
2158f883	119	#define ZIP_DATA_DESC_SIZE offsetof(struct zip_data_desc, _end)
0ea865ce RS	120	#define ZIP_DIR_HEADER_SIZE offsetof(struct zip_dir_header, _end)
0ea865ce RS	121	#define ZIP_DIR_TRAILER_SIZE offsetof(struct zip_dir_trailer, _end)
227bf598 RS	122	#define ZIP_EXTRA_MTIME_SIZE offsetof(struct zip_extra_mtime, _end)
	123	#define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
	124	(ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
88329ca8 RS	125	#define ZIP64_DIR_TRAILER_SIZE offsetof(struct zip64_dir_trailer, _end)
	126	#define ZIP64_DIR_TRAILER_RECORD_SIZE \
	127	(ZIP64_DIR_TRAILER_SIZE - \
	128	offsetof(struct zip64_dir_trailer, creator_version))
	129	#define ZIP64_DIR_TRAILER_LOCATOR_SIZE \
	130	offsetof(struct zip64_dir_trailer_locator, _end)
0ea865ce	131
e4fbbfe9 RS	132	static void copy_le16(unsigned char *dest, unsigned int n)
	133	{
	134	dest[0] = 0xff & n;
	135	dest[1] = 0xff & (n >> 010);
	136	}
	137
	138	static void copy_le32(unsigned char *dest, unsigned int n)
	139	{
	140	dest[0] = 0xff & n;
	141	dest[1] = 0xff & (n >> 010);
	142	dest[2] = 0xff & (n >> 020);
	143	dest[3] = 0xff & (n >> 030);
	144	}
	145
88329ca8 RS	146	static void copy_le64(unsigned char *dest, uint64_t n)
	147	{
	148	dest[0] = 0xff & n;
	149	dest[1] = 0xff & (n >> 010);
	150	dest[2] = 0xff & (n >> 020);
	151	dest[3] = 0xff & (n >> 030);
	152	dest[4] = 0xff & (n >> 040);
	153	dest[5] = 0xff & (n >> 050);
	154	dest[6] = 0xff & (n >> 060);
	155	dest[7] = 0xff & (n >> 070);
	156	}
	157
	158	static uint64_t clamp_max(uint64_t n, uint64_t max, int *clamped)
	159	{
	160	if (n <= max)
	161	return n;
	162	*clamped = 1;
	163	return max;
	164	}
	165
	166	static void copy_le16_clamp(unsigned char dest, uint64_t n, int clamped)
	167	{
	168	copy_le16(dest, clamp_max(n, 0xffff, clamped));
	169	}
	170
c3c2e1a0 RS	171	static void zlib_deflate_raw(void data, unsigned long size,
	172	int compression_level,
	173	unsigned long *compressed_size)
e4fbbfe9	174	{
ef49a7a0	175	git_zstream stream;
e4fbbfe9 RS	176	unsigned long maxsize;
	177	void *buffer;
	178	int result;
	179
c3c2e1a0	180	git_deflate_init_raw(&stream, compression_level);
225a6f10	181	maxsize = git_deflate_bound(&stream, size);
e4fbbfe9 RS	182	buffer = xmalloc(maxsize);
	183
	184	stream.next_in = data;
	185	stream.avail_in = size;
	186	stream.next_out = buffer;
	187	stream.avail_out = maxsize;
	188
	189	do {
55bb5c91	190	result = git_deflate(&stream, Z_FINISH);
e4fbbfe9 RS	191	} while (result == Z_OK);
	192
	193	if (result != Z_STREAM_END) {
	194	free(buffer);
	195	return NULL;
	196	}
	197
55bb5c91	198	git_deflate_end(&stream);
e4fbbfe9 RS	199	*compressed_size = stream.total_out;
	200
	201	return buffer;
	202	}
	203
2158f883 RS	204	static void write_zip_data_desc(unsigned long size,
	205	unsigned long compressed_size,
	206	unsigned long crc)
	207	{
	208	struct zip_data_desc trailer;
	209
	210	copy_le32(trailer.magic, 0x08074b50);
	211	copy_le32(trailer.crc32, crc);
	212	copy_le32(trailer.compressed_size, compressed_size);
	213	copy_le32(trailer.size, size);
	214	write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
	215	}
	216
ebf5374a RS	217	static void set_zip_dir_data_desc(struct zip_dir_header *header,
	218	unsigned long size,
	219	unsigned long compressed_size,
	220	unsigned long crc)
	221	{
	222	copy_le32(header->crc32, crc);
	223	copy_le32(header->compressed_size, compressed_size);
	224	copy_le32(header->size, size);
	225	}
	226
	227	static void set_zip_header_data_desc(struct zip_local_header *header,
	228	unsigned long size,
	229	unsigned long compressed_size,
	230	unsigned long crc)
	231	{
	232	copy_le32(header->crc32, crc);
	233	copy_le32(header->compressed_size, compressed_size);
	234	copy_le32(header->size, size);
	235	}
	236
88182bab RS	237	static int has_only_ascii(const char *s)
	238	{
	239	for (;;) {
	240	int c = *s++;
	241	if (c == '\0')
	242	return 1;
	243	if (!isascii(c))
	244	return 0;
	245	}
	246	}
	247
4aff646d RS	248	static int entry_is_binary(const char path, const void buffer, size_t size)
	249	{
	250	struct userdiff_driver *driver = userdiff_find_by_path(path);
	251	if (!driver)
	252	driver = userdiff_find_by_name("default");
	253	if (driver->binary != -1)
	254	return driver->binary;
	255	return buffer_is_binary(buffer, size);
	256	}
	257
2158f883 RS	258	#define STREAM_BUFFER_SIZE (1024 * 16)
2158f883 RS	259
562e25ab	260	static int write_zip_entry(struct archiver_args *args,
9cb513b7 NTND	261	const unsigned char *sha1,
	262	const char *path, size_t pathlen,
	263	unsigned int mode)
e4fbbfe9 RS	264	{
	265	struct zip_local_header header;
	266	struct zip_dir_header dirent;
227bf598	267	struct zip_extra_mtime extra;
bb52d22e	268	unsigned long attr2;
e4fbbfe9	269	unsigned long compressed_size;
e4fbbfe9 RS	270	unsigned long crc;
e4fbbfe9 RS	271	unsigned long direntsize;
e4fbbfe9	272	int method;
e4fbbfe9	273	unsigned char *out;
e4fbbfe9	274	void *deflated = NULL;
9cb513b7	275	void *buffer;
2158f883 RS	276	struct git_istream *stream = NULL;
2158f883 RS	277	unsigned long flags = 0;
9cb513b7	278	unsigned long size;
4aff646d RS	279	int is_binary = -1;
4aff646d RS	280	const char *path_without_prefix = path + args->baselen;
0f747f9d	281	unsigned int creator_version = 0;
e4fbbfe9	282
38f4d138	283	crc = crc32(0, NULL, 0);
e4fbbfe9	284
88182bab RS	285	if (!has_only_ascii(path)) {
	286	if (is_utf8(path))
	287	flags \|= ZIP_UTF8;
	288	else
	289	warning("Path is not valid UTF-8: %s", path);
	290	}
	291
e4fbbfe9	292	if (pathlen > 0xffff) {
562e25ab RS	293	return error("path too long (%d chars, SHA1: %s): %s",
562e25ab RS	294	(int)pathlen, sha1_to_hex(sha1), path);
e4fbbfe9 RS	295	}
e4fbbfe9 RS	296
302b9282	297	if (S_ISDIR(mode) \|\| S_ISGITLINK(mode)) {
e4fbbfe9	298	method = 0;
62cdce17	299	attr2 = 16;
e4fbbfe9	300	out = NULL;
60df6bd1	301	size = 0;
e4fbbfe9	302	compressed_size = 0;
9cb513b7	303	buffer = NULL;
62cdce17	304	} else if (S_ISREG(mode) \|\| S_ISLNK(mode)) {
2158f883	305	enum object_type type = sha1_object_info(sha1, &size);
9cb513b7	306
62cdce17	307	method = 0;
bb52d22e JH	308	attr2 = S_ISLNK(mode) ? ((mode \| 0777) << 16) :
bb52d22e JH	309	(mode & 0111) ? ((mode) << 16) : 0;
0f747f9d RS	310	if (S_ISLNK(mode) \|\| (mode & 0111))
0f747f9d RS	311	creator_version = 0x0317;
2158f883	312	if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
62cdce17	313	method = 8;
2158f883 RS	314
2158f883 RS	315	if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
c743c215	316	size > big_file_threshold) {
2158f883 RS	317	stream = open_istream(sha1, &type, &size, NULL);
	318	if (!stream)
	319	return error("cannot stream blob %s",
	320	sha1_to_hex(sha1));
	321	flags \|= ZIP_STREAM;
	322	out = buffer = NULL;
	323	} else {
	324	buffer = sha1_file_to_archive(args, path, sha1, mode,
	325	&type, &size);
	326	if (!buffer)
	327	return error("cannot read %s",
	328	sha1_to_hex(sha1));
	329	crc = crc32(crc, buffer, size);
4aff646d RS	330	is_binary = entry_is_binary(path_without_prefix,
4aff646d RS	331	buffer, size);
2158f883 RS	332	out = buffer;
2158f883 RS	333	}
d3c1472f	334	compressed_size = (method == 0) ? size : 0;
e4fbbfe9	335	} else {
562e25ab RS	336	return error("unsupported file mode: 0%o (SHA1: %s)", mode,
562e25ab RS	337	sha1_to_hex(sha1));
e4fbbfe9 RS	338	}
e4fbbfe9 RS	339
88329ca8 RS	340	if (creator_version > max_creator_version)
	341	max_creator_version = creator_version;
	342
2158f883	343	if (buffer && method == 8) {
c3c2e1a0 RS	344	out = deflated = zlib_deflate_raw(buffer, size,
	345	args->compression_level,
	346	&compressed_size);
	347	if (!out \|\| compressed_size >= size) {
	348	out = buffer;
e4fbbfe9 RS	349	method = 0;
	350	compressed_size = size;
	351	}
	352	}
	353
227bf598 RS	354	copy_le16(extra.magic, 0x5455);
	355	copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
	356	extra.flags[0] = 1; /* just mtime */
	357	copy_le32(extra.mtime, args->time);
	358
e4fbbfe9	359	/* make sure we have enough free space in the dictionary */
227bf598	360	direntsize = ZIP_DIR_HEADER_SIZE + pathlen + ZIP_EXTRA_MTIME_SIZE;
e4fbbfe9 RS	361	while (zip_dir_size < zip_dir_offset + direntsize) {
	362	zip_dir_size += ZIP_DIRECTORY_MIN_SIZE;
	363	zip_dir = xrealloc(zip_dir, zip_dir_size);
	364	}
	365
	366	copy_le32(dirent.magic, 0x02014b50);
0f747f9d	367	copy_le16(dirent.creator_version, creator_version);
cf72fb07	368	copy_le16(dirent.version, 10);
2158f883	369	copy_le16(dirent.flags, flags);
e4fbbfe9 RS	370	copy_le16(dirent.compression_method, method);
	371	copy_le16(dirent.mtime, zip_time);
	372	copy_le16(dirent.mdate, zip_date);
ebf5374a	373	set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
e4fbbfe9	374	copy_le16(dirent.filename_length, pathlen);
227bf598	375	copy_le16(dirent.extra_length, ZIP_EXTRA_MTIME_SIZE);
e4fbbfe9 RS	376	copy_le16(dirent.comment_length, 0);
e4fbbfe9 RS	377	copy_le16(dirent.disk, 0);
62cdce17	378	copy_le32(dirent.attr2, attr2);
e4fbbfe9	379	copy_le32(dirent.offset, zip_offset);
e4fbbfe9 RS	380
e4fbbfe9 RS	381	copy_le32(header.magic, 0x04034b50);
cf72fb07	382	copy_le16(header.version, 10);
2158f883	383	copy_le16(header.flags, flags);
e4fbbfe9 RS	384	copy_le16(header.compression_method, method);
	385	copy_le16(header.mtime, zip_time);
	386	copy_le16(header.mdate, zip_date);
5ea2c847	387	set_zip_header_data_desc(&header, size, compressed_size, crc);
e4fbbfe9	388	copy_le16(header.filename_length, pathlen);
227bf598	389	copy_le16(header.extra_length, ZIP_EXTRA_MTIME_SIZE);
0ea865ce RS	390	write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
0ea865ce RS	391	zip_offset += ZIP_LOCAL_HEADER_SIZE;
e4fbbfe9 RS	392	write_or_die(1, path, pathlen);
e4fbbfe9 RS	393	zip_offset += pathlen;
227bf598 RS	394	write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
227bf598 RS	395	zip_offset += ZIP_EXTRA_MTIME_SIZE;
2158f883 RS	396	if (stream && method == 0) {
	397	unsigned char buf[STREAM_BUFFER_SIZE];
	398	ssize_t readlen;
	399
	400	for (;;) {
	401	readlen = read_istream(stream, buf, sizeof(buf));
	402	if (readlen <= 0)
	403	break;
	404	crc = crc32(crc, buf, readlen);
4aff646d RS	405	if (is_binary == -1)
	406	is_binary = entry_is_binary(path_without_prefix,
	407	buf, readlen);
2158f883 RS	408	write_or_die(1, buf, readlen);
	409	}
	410	close_istream(stream);
	411	if (readlen)
	412	return readlen;
	413
	414	compressed_size = size;
	415	zip_offset += compressed_size;
	416
	417	write_zip_data_desc(size, compressed_size, crc);
	418	zip_offset += ZIP_DATA_DESC_SIZE;
	419
c743c215 RS	420	set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
	421	} else if (stream && method == 8) {
	422	unsigned char buf[STREAM_BUFFER_SIZE];
	423	ssize_t readlen;
	424	git_zstream zstream;
	425	int result;
	426	size_t out_len;
	427	unsigned char compressed[STREAM_BUFFER_SIZE * 2];
	428
c3c2e1a0	429	git_deflate_init_raw(&zstream, args->compression_level);
c743c215 RS	430
	431	compressed_size = 0;
	432	zstream.next_out = compressed;
	433	zstream.avail_out = sizeof(compressed);
	434
	435	for (;;) {
	436	readlen = read_istream(stream, buf, sizeof(buf));
	437	if (readlen <= 0)
	438	break;
	439	crc = crc32(crc, buf, readlen);
4aff646d RS	440	if (is_binary == -1)
	441	is_binary = entry_is_binary(path_without_prefix,
	442	buf, readlen);
c743c215 RS	443
	444	zstream.next_in = buf;
	445	zstream.avail_in = readlen;
	446	result = git_deflate(&zstream, 0);
	447	if (result != Z_OK)
	448	die("deflate error (%d)", result);
c3c2e1a0	449	out_len = zstream.next_out - compressed;
c743c215 RS	450
c743c215 RS	451	if (out_len > 0) {
c3c2e1a0	452	write_or_die(1, compressed, out_len);
c743c215 RS	453	compressed_size += out_len;
	454	zstream.next_out = compressed;
	455	zstream.avail_out = sizeof(compressed);
	456	}
	457
	458	}
	459	close_istream(stream);
	460	if (readlen)
	461	return readlen;
	462
	463	zstream.next_in = buf;
	464	zstream.avail_in = 0;
	465	result = git_deflate(&zstream, Z_FINISH);
	466	if (result != Z_STREAM_END)
	467	die("deflate error (%d)", result);
	468
	469	git_deflate_end(&zstream);
c3c2e1a0 RS	470	out_len = zstream.next_out - compressed;
c3c2e1a0 RS	471	write_or_die(1, compressed, out_len);
c743c215 RS	472	compressed_size += out_len;
	473	zip_offset += compressed_size;
	474
	475	write_zip_data_desc(size, compressed_size, crc);
	476	zip_offset += ZIP_DATA_DESC_SIZE;
	477
2158f883 RS	478	set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
2158f883 RS	479	} else if (compressed_size > 0) {
e4fbbfe9 RS	480	write_or_die(1, out, compressed_size);
	481	zip_offset += compressed_size;
	482	}
	483
e4fbbfe9	484	free(deflated);
9cb513b7	485	free(buffer);
e4fbbfe9	486
4aff646d RS	487	copy_le16(dirent.attr1, !is_binary);
4aff646d RS	488
ebf5374a RS	489	memcpy(zip_dir + zip_dir_offset, &dirent, ZIP_DIR_HEADER_SIZE);
	490	zip_dir_offset += ZIP_DIR_HEADER_SIZE;
	491	memcpy(zip_dir + zip_dir_offset, path, pathlen);
	492	zip_dir_offset += pathlen;
227bf598 RS	493	memcpy(zip_dir + zip_dir_offset, &extra, ZIP_EXTRA_MTIME_SIZE);
227bf598 RS	494	zip_dir_offset += ZIP_EXTRA_MTIME_SIZE;
ebf5374a RS	495	zip_dir_entries++;
ebf5374a RS	496
562e25ab	497	return 0;
e4fbbfe9 RS	498	}
e4fbbfe9 RS	499
88329ca8 RS	500	static void write_zip64_trailer(void)
	501	{
	502	struct zip64_dir_trailer trailer64;
	503	struct zip64_dir_trailer_locator locator64;
	504
	505	copy_le32(trailer64.magic, 0x06064b50);
	506	copy_le64(trailer64.record_size, ZIP64_DIR_TRAILER_RECORD_SIZE);
	507	copy_le16(trailer64.creator_version, max_creator_version);
	508	copy_le16(trailer64.version, 45);
	509	copy_le32(trailer64.disk, 0);
	510	copy_le32(trailer64.directory_start_disk, 0);
	511	copy_le64(trailer64.entries_on_this_disk, zip_dir_entries);
	512	copy_le64(trailer64.entries, zip_dir_entries);
	513	copy_le64(trailer64.size, zip_dir_offset);
	514	copy_le64(trailer64.offset, zip_offset);
	515
	516	copy_le32(locator64.magic, 0x07064b50);
	517	copy_le32(locator64.disk, 0);
	518	copy_le64(locator64.offset, zip_offset + zip_dir_offset);
	519	copy_le32(locator64.number_of_disks, 1);
	520
	521	write_or_die(1, &trailer64, ZIP64_DIR_TRAILER_SIZE);
	522	write_or_die(1, &locator64, ZIP64_DIR_TRAILER_LOCATOR_SIZE);
	523	}
	524
e4fbbfe9 RS	525	static void write_zip_trailer(const unsigned char *sha1)
	526	{
	527	struct zip_dir_trailer trailer;
88329ca8	528	int clamped = 0;
e4fbbfe9 RS	529
	530	copy_le32(trailer.magic, 0x06054b50);
	531	copy_le16(trailer.disk, 0);
	532	copy_le16(trailer.directory_start_disk, 0);
88329ca8 RS	533	copy_le16_clamp(trailer.entries_on_this_disk, zip_dir_entries,
	534	&clamped);
	535	copy_le16_clamp(trailer.entries, zip_dir_entries, &clamped);
e4fbbfe9 RS	536	copy_le32(trailer.size, zip_dir_offset);
e4fbbfe9 RS	537	copy_le32(trailer.offset, zip_offset);
aeecdcd4	538	copy_le16(trailer.comment_length, sha1 ? GIT_SHA1_HEXSZ : 0);
e4fbbfe9 RS	539
e4fbbfe9 RS	540	write_or_die(1, zip_dir, zip_dir_offset);
88329ca8 RS	541	if (clamped)
88329ca8 RS	542	write_zip64_trailer();
0ea865ce	543	write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
e4fbbfe9	544	if (sha1)
aeecdcd4	545	write_or_die(1, sha1_to_hex(sha1), GIT_SHA1_HEXSZ);
e4fbbfe9 RS	546	}
	547
	548	static void dos_time(time_t time, int dos_date, int *dos_time)
	549	{
	550	struct tm *t = localtime(time);
	551
	552	dos_date = t->tm_mday + (t->tm_mon + 1) 32 +
	553	(t->tm_year + 1900 - 1980) * 512;
	554	dos_time = t->tm_sec / 2 + t->tm_min 32 + t->tm_hour * 2048;
	555	}
	556
4d7c9898 JK	557	static int write_zip_archive(const struct archiver *ar,
4d7c9898 JK	558	struct archiver_args *args)
ec06bff5	559	{
562e25ab RS	560	int err;
562e25ab RS	561
ec06bff5 FBH	562	dos_time(&args->time, &zip_date, &zip_time);
	563
	564	zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
	565	zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
562e25ab RS	566
	567	err = write_archive_entries(args, write_zip_entry);
	568	if (!err)
	569	write_zip_trailer(args->commit_sha1);
ec06bff5 FBH	570
	571	free(zip_dir);
	572
562e25ab	573	return err;
ec06bff5	574	}
13e0f88d JK	575
	576	static struct archiver zip_archiver = {
	577	"zip",
	578	write_zip_archive,
7b97730b	579	ARCHIVER_WANT_COMPRESSION_LEVELS\|ARCHIVER_REMOTE
13e0f88d JK	580	};
	581
	582	void init_zip_archiver(void)
	583	{
	584	register_archiver(&zip_archiver);
	585	}