[git/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;

/* We only care about the "buf" part here. */
static struct strbuf zip_dir;

static uintmax_t zip_offset;
static uint64_t zip_dir_entries;

static unsigned int max_creator_version;

#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_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 copy_le32_clamp(unsigned char *dest, uint64_t n, int *clamped)
{
	copy_le32(dest, clamp_max(n, 0xffffffff, clamped));
}

static int strbuf_add_le(struct strbuf *sb, size_t size, uintmax_t n)
{
	while (size-- > 0) {
		strbuf_addch(sb, n & 0xff);
		n >>= 8;
	}
	return -!!n;
}

static uint32_t clamp32(uintmax_t n)
{
	const uintmax_t max = 0xffffffff;
	return (n < max) ? n : max;
}

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_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;
	uintmax_t offset = zip_offset;
	struct zip_extra_mtime extra;
	unsigned long attr2;
	unsigned long compressed_size;
	unsigned long crc;
	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;
	size_t zip_dir_extra_size = ZIP_EXTRA_MTIME_SIZE;
	size_t zip64_dir_extra_payload_size = 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);

	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;
	} 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;
	} else if (compressed_size > 0) {
		write_or_die(1, out, compressed_size);
		zip_offset += compressed_size;
	}

	free(deflated);
	free(buffer);

	if (offset > 0xffffffff) {
		zip64_dir_extra_payload_size += 8;
		zip_dir_extra_size += 2 + 2 + zip64_dir_extra_payload_size;
	}

	strbuf_add_le(&zip_dir, 4, 0x02014b50);	/* magic */
	strbuf_add_le(&zip_dir, 2, creator_version);
	strbuf_add_le(&zip_dir, 2, 10);		/* version */
	strbuf_add_le(&zip_dir, 2, flags);
	strbuf_add_le(&zip_dir, 2, method);
	strbuf_add_le(&zip_dir, 2, zip_time);
	strbuf_add_le(&zip_dir, 2, zip_date);
	strbuf_add_le(&zip_dir, 4, crc);
	strbuf_add_le(&zip_dir, 4, compressed_size);
	strbuf_add_le(&zip_dir, 4, size);
	strbuf_add_le(&zip_dir, 2, pathlen);
	strbuf_add_le(&zip_dir, 2, zip_dir_extra_size);
	strbuf_add_le(&zip_dir, 2, 0);		/* comment length */
	strbuf_add_le(&zip_dir, 2, 0);		/* disk */
	strbuf_add_le(&zip_dir, 2, !is_binary);
	strbuf_add_le(&zip_dir, 4, attr2);
	strbuf_add_le(&zip_dir, 4, clamp32(offset));
	strbuf_add(&zip_dir, path, pathlen);
	strbuf_add(&zip_dir, &extra, ZIP_EXTRA_MTIME_SIZE);
	if (zip64_dir_extra_payload_size) {
		strbuf_add_le(&zip_dir, 2, 0x0001);	/* magic */
		strbuf_add_le(&zip_dir, 2, zip64_dir_extra_payload_size);
		if (offset >= 0xffffffff)
			strbuf_add_le(&zip_dir, 8, offset);
	}
	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.len);
	copy_le64(trailer64.offset, zip_offset);

	copy_le32(locator64.magic, 0x07064b50);
	copy_le32(locator64.disk, 0);
	copy_le64(locator64.offset, zip_offset + zip_dir.len);
	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.len);
	copy_le32_clamp(trailer.offset, zip_offset, &clamped);
	copy_le16(trailer.comment_length, sha1 ? GIT_SHA1_HEXSZ : 0);

	write_or_die(1, zip_dir.buf, zip_dir.len);
	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 archive_zip_config(const char *var, const char *value, void *data)
{
	return userdiff_config(var, value);
}

static int write_zip_archive(const struct archiver *ar,
			     struct archiver_args *args)
{
	int err;

	git_config(archive_zip_config, NULL);

	dos_time(&args->time, &zip_date, &zip_time);

	strbuf_init(&zip_dir, 0);

	err = write_archive_entries(args, write_zip_entry);
	if (!err)
		write_zip_trailer(args->commit_sha1);

	strbuf_release(&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
c061a149 RS	14	/* We only care about the "buf" part here. */
c061a149 RS	15	static struct strbuf zip_dir;
e4fbbfe9	16
af95749f	17	static uintmax_t zip_offset;
88329ca8 RS	18	static uint64_t zip_dir_entries;
	19
	20	static unsigned int max_creator_version;
e4fbbfe9	21
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_trailer {
	49	unsigned char magic[4];
	50	unsigned char disk[2];
	51	unsigned char directory_start_disk[2];
	52	unsigned char entries_on_this_disk[2];
	53	unsigned char entries[2];
	54	unsigned char size[4];
	55	unsigned char offset[4];
	56	unsigned char comment_length[2];
0ea865ce	57	unsigned char _end[1];
e4fbbfe9 RS	58	};
e4fbbfe9 RS	59
227bf598 RS	60	struct zip_extra_mtime {
	61	unsigned char magic[2];
	62	unsigned char extra_size[2];
	63	unsigned char flags[1];
	64	unsigned char mtime[4];
	65	unsigned char _end[1];
	66	};
	67
88329ca8 RS	68	struct zip64_dir_trailer {
	69	unsigned char magic[4];
	70	unsigned char record_size[8];
	71	unsigned char creator_version[2];
	72	unsigned char version[2];
	73	unsigned char disk[4];
	74	unsigned char directory_start_disk[4];
	75	unsigned char entries_on_this_disk[8];
	76	unsigned char entries[8];
	77	unsigned char size[8];
	78	unsigned char offset[8];
	79	unsigned char _end[1];
	80	};
	81
	82	struct zip64_dir_trailer_locator {
	83	unsigned char magic[4];
	84	unsigned char disk[4];
	85	unsigned char offset[8];
	86	unsigned char number_of_disks[4];
	87	unsigned char _end[1];
	88	};
	89
0ea865ce RS	90	/*
	91	* On ARM, padding is added at the end of the struct, so a simple
	92	* sizeof(struct ...) reports two bytes more than the payload size
	93	* we're interested in.
	94	*/
	95	#define ZIP_LOCAL_HEADER_SIZE offsetof(struct zip_local_header, _end)
2158f883	96	#define ZIP_DATA_DESC_SIZE offsetof(struct zip_data_desc, _end)
0ea865ce RS	97	#define ZIP_DIR_HEADER_SIZE offsetof(struct zip_dir_header, _end)
0ea865ce RS	98	#define ZIP_DIR_TRAILER_SIZE offsetof(struct zip_dir_trailer, _end)
227bf598 RS	99	#define ZIP_EXTRA_MTIME_SIZE offsetof(struct zip_extra_mtime, _end)
	100	#define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
	101	(ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
88329ca8 RS	102	#define ZIP64_DIR_TRAILER_SIZE offsetof(struct zip64_dir_trailer, _end)
	103	#define ZIP64_DIR_TRAILER_RECORD_SIZE \
	104	(ZIP64_DIR_TRAILER_SIZE - \
	105	offsetof(struct zip64_dir_trailer, creator_version))
	106	#define ZIP64_DIR_TRAILER_LOCATOR_SIZE \
	107	offsetof(struct zip64_dir_trailer_locator, _end)
0ea865ce	108
e4fbbfe9 RS	109	static void copy_le16(unsigned char *dest, unsigned int n)
	110	{
	111	dest[0] = 0xff & n;
	112	dest[1] = 0xff & (n >> 010);
	113	}
	114
	115	static void copy_le32(unsigned char *dest, unsigned int n)
	116	{
	117	dest[0] = 0xff & n;
	118	dest[1] = 0xff & (n >> 010);
	119	dest[2] = 0xff & (n >> 020);
	120	dest[3] = 0xff & (n >> 030);
	121	}
	122
88329ca8 RS	123	static void copy_le64(unsigned char *dest, uint64_t n)
	124	{
	125	dest[0] = 0xff & n;
	126	dest[1] = 0xff & (n >> 010);
	127	dest[2] = 0xff & (n >> 020);
	128	dest[3] = 0xff & (n >> 030);
	129	dest[4] = 0xff & (n >> 040);
	130	dest[5] = 0xff & (n >> 050);
	131	dest[6] = 0xff & (n >> 060);
	132	dest[7] = 0xff & (n >> 070);
	133	}
	134
	135	static uint64_t clamp_max(uint64_t n, uint64_t max, int *clamped)
	136	{
	137	if (n <= max)
	138	return n;
	139	*clamped = 1;
	140	return max;
	141	}
	142
	143	static void copy_le16_clamp(unsigned char dest, uint64_t n, int clamped)
	144	{
	145	copy_le16(dest, clamp_max(n, 0xffff, clamped));
	146	}
	147
af95749f RS	148	static void copy_le32_clamp(unsigned char dest, uint64_t n, int clamped)
	149	{
	150	copy_le32(dest, clamp_max(n, 0xffffffff, clamped));
	151	}
	152
3c78fd80 RS	153	static int strbuf_add_le(struct strbuf *sb, size_t size, uintmax_t n)
	154	{
	155	while (size-- > 0) {
	156	strbuf_addch(sb, n & 0xff);
	157	n >>= 8;
	158	}
	159	return -!!n;
	160	}
	161
af95749f RS	162	static uint32_t clamp32(uintmax_t n)
	163	{
	164	const uintmax_t max = 0xffffffff;
	165	return (n < max) ? n : max;
	166	}
	167
c3c2e1a0 RS	168	static void zlib_deflate_raw(void data, unsigned long size,
	169	int compression_level,
	170	unsigned long *compressed_size)
e4fbbfe9	171	{
ef49a7a0	172	git_zstream stream;
e4fbbfe9 RS	173	unsigned long maxsize;
	174	void *buffer;
	175	int result;
	176
c3c2e1a0	177	git_deflate_init_raw(&stream, compression_level);
225a6f10	178	maxsize = git_deflate_bound(&stream, size);
e4fbbfe9 RS	179	buffer = xmalloc(maxsize);
	180
	181	stream.next_in = data;
	182	stream.avail_in = size;
	183	stream.next_out = buffer;
	184	stream.avail_out = maxsize;
	185
	186	do {
55bb5c91	187	result = git_deflate(&stream, Z_FINISH);
e4fbbfe9 RS	188	} while (result == Z_OK);
	189
	190	if (result != Z_STREAM_END) {
	191	free(buffer);
	192	return NULL;
	193	}
	194
55bb5c91	195	git_deflate_end(&stream);
e4fbbfe9 RS	196	*compressed_size = stream.total_out;
	197
	198	return buffer;
	199	}
	200
2158f883 RS	201	static void write_zip_data_desc(unsigned long size,
	202	unsigned long compressed_size,
	203	unsigned long crc)
	204	{
	205	struct zip_data_desc trailer;
	206
	207	copy_le32(trailer.magic, 0x08074b50);
	208	copy_le32(trailer.crc32, crc);
	209	copy_le32(trailer.compressed_size, compressed_size);
	210	copy_le32(trailer.size, size);
	211	write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
	212	}
	213
ebf5374a RS	214	static void set_zip_header_data_desc(struct zip_local_header *header,
	215	unsigned long size,
	216	unsigned long compressed_size,
	217	unsigned long crc)
	218	{
	219	copy_le32(header->crc32, crc);
	220	copy_le32(header->compressed_size, compressed_size);
	221	copy_le32(header->size, size);
	222	}
	223
88182bab RS	224	static int has_only_ascii(const char *s)
	225	{
	226	for (;;) {
	227	int c = *s++;
	228	if (c == '\0')
	229	return 1;
	230	if (!isascii(c))
	231	return 0;
	232	}
	233	}
	234
4aff646d RS	235	static int entry_is_binary(const char path, const void buffer, size_t size)
	236	{
	237	struct userdiff_driver *driver = userdiff_find_by_path(path);
	238	if (!driver)
	239	driver = userdiff_find_by_name("default");
	240	if (driver->binary != -1)
	241	return driver->binary;
	242	return buffer_is_binary(buffer, size);
	243	}
	244
2158f883 RS	245	#define STREAM_BUFFER_SIZE (1024 * 16)
2158f883 RS	246
562e25ab	247	static int write_zip_entry(struct archiver_args *args,
9cb513b7 NTND	248	const unsigned char *sha1,
	249	const char *path, size_t pathlen,
	250	unsigned int mode)
e4fbbfe9 RS	251	{
e4fbbfe9 RS	252	struct zip_local_header header;
3c78fd80	253	uintmax_t offset = zip_offset;
227bf598	254	struct zip_extra_mtime extra;
bb52d22e	255	unsigned long attr2;
e4fbbfe9	256	unsigned long compressed_size;
e4fbbfe9	257	unsigned long crc;
e4fbbfe9	258	int method;
e4fbbfe9	259	unsigned char *out;
e4fbbfe9	260	void *deflated = NULL;
9cb513b7	261	void *buffer;
2158f883 RS	262	struct git_istream *stream = NULL;
2158f883 RS	263	unsigned long flags = 0;
9cb513b7	264	unsigned long size;
4aff646d RS	265	int is_binary = -1;
4aff646d RS	266	const char *path_without_prefix = path + args->baselen;
0f747f9d	267	unsigned int creator_version = 0;
af95749f RS	268	size_t zip_dir_extra_size = ZIP_EXTRA_MTIME_SIZE;
af95749f RS	269	size_t zip64_dir_extra_payload_size = 0;
e4fbbfe9	270
38f4d138	271	crc = crc32(0, NULL, 0);
e4fbbfe9	272
88182bab RS	273	if (!has_only_ascii(path)) {
	274	if (is_utf8(path))
	275	flags \|= ZIP_UTF8;
	276	else
	277	warning("Path is not valid UTF-8: %s", path);
	278	}
	279
e4fbbfe9	280	if (pathlen > 0xffff) {
562e25ab RS	281	return error("path too long (%d chars, SHA1: %s): %s",
562e25ab RS	282	(int)pathlen, sha1_to_hex(sha1), path);
e4fbbfe9 RS	283	}
e4fbbfe9 RS	284
302b9282	285	if (S_ISDIR(mode) \|\| S_ISGITLINK(mode)) {
e4fbbfe9	286	method = 0;
62cdce17	287	attr2 = 16;
e4fbbfe9	288	out = NULL;
60df6bd1	289	size = 0;
e4fbbfe9	290	compressed_size = 0;
9cb513b7	291	buffer = NULL;
62cdce17	292	} else if (S_ISREG(mode) \|\| S_ISLNK(mode)) {
2158f883	293	enum object_type type = sha1_object_info(sha1, &size);
9cb513b7	294
62cdce17	295	method = 0;
bb52d22e JH	296	attr2 = S_ISLNK(mode) ? ((mode \| 0777) << 16) :
bb52d22e JH	297	(mode & 0111) ? ((mode) << 16) : 0;
0f747f9d RS	298	if (S_ISLNK(mode) \|\| (mode & 0111))
0f747f9d RS	299	creator_version = 0x0317;
2158f883	300	if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
62cdce17	301	method = 8;
2158f883 RS	302
2158f883 RS	303	if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
c743c215	304	size > big_file_threshold) {
2158f883 RS	305	stream = open_istream(sha1, &type, &size, NULL);
	306	if (!stream)
	307	return error("cannot stream blob %s",
	308	sha1_to_hex(sha1));
	309	flags \|= ZIP_STREAM;
	310	out = buffer = NULL;
	311	} else {
	312	buffer = sha1_file_to_archive(args, path, sha1, mode,
	313	&type, &size);
	314	if (!buffer)
	315	return error("cannot read %s",
	316	sha1_to_hex(sha1));
	317	crc = crc32(crc, buffer, size);
4aff646d RS	318	is_binary = entry_is_binary(path_without_prefix,
4aff646d RS	319	buffer, size);
2158f883 RS	320	out = buffer;
2158f883 RS	321	}
d3c1472f	322	compressed_size = (method == 0) ? size : 0;
e4fbbfe9	323	} else {
562e25ab RS	324	return error("unsupported file mode: 0%o (SHA1: %s)", mode,
562e25ab RS	325	sha1_to_hex(sha1));
e4fbbfe9 RS	326	}
e4fbbfe9 RS	327
88329ca8 RS	328	if (creator_version > max_creator_version)
	329	max_creator_version = creator_version;
	330
2158f883	331	if (buffer && method == 8) {
c3c2e1a0 RS	332	out = deflated = zlib_deflate_raw(buffer, size,
	333	args->compression_level,
	334	&compressed_size);
	335	if (!out \|\| compressed_size >= size) {
	336	out = buffer;
e4fbbfe9 RS	337	method = 0;
	338	compressed_size = size;
	339	}
	340	}
	341
227bf598 RS	342	copy_le16(extra.magic, 0x5455);
	343	copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
	344	extra.flags[0] = 1; /* just mtime */
	345	copy_le32(extra.mtime, args->time);
	346
e4fbbfe9	347	copy_le32(header.magic, 0x04034b50);
cf72fb07	348	copy_le16(header.version, 10);
2158f883	349	copy_le16(header.flags, flags);
e4fbbfe9 RS	350	copy_le16(header.compression_method, method);
	351	copy_le16(header.mtime, zip_time);
	352	copy_le16(header.mdate, zip_date);
5ea2c847	353	set_zip_header_data_desc(&header, size, compressed_size, crc);
e4fbbfe9	354	copy_le16(header.filename_length, pathlen);
227bf598	355	copy_le16(header.extra_length, ZIP_EXTRA_MTIME_SIZE);
0ea865ce RS	356	write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
0ea865ce RS	357	zip_offset += ZIP_LOCAL_HEADER_SIZE;
e4fbbfe9 RS	358	write_or_die(1, path, pathlen);
e4fbbfe9 RS	359	zip_offset += pathlen;
227bf598 RS	360	write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
227bf598 RS	361	zip_offset += ZIP_EXTRA_MTIME_SIZE;
2158f883 RS	362	if (stream && method == 0) {
	363	unsigned char buf[STREAM_BUFFER_SIZE];
	364	ssize_t readlen;
	365
	366	for (;;) {
	367	readlen = read_istream(stream, buf, sizeof(buf));
	368	if (readlen <= 0)
	369	break;
	370	crc = crc32(crc, buf, readlen);
4aff646d RS	371	if (is_binary == -1)
	372	is_binary = entry_is_binary(path_without_prefix,
	373	buf, readlen);
2158f883 RS	374	write_or_die(1, buf, readlen);
	375	}
	376	close_istream(stream);
	377	if (readlen)
	378	return readlen;
	379
	380	compressed_size = size;
	381	zip_offset += compressed_size;
	382
	383	write_zip_data_desc(size, compressed_size, crc);
	384	zip_offset += ZIP_DATA_DESC_SIZE;
c743c215 RS	385	} else if (stream && method == 8) {
	386	unsigned char buf[STREAM_BUFFER_SIZE];
	387	ssize_t readlen;
	388	git_zstream zstream;
	389	int result;
	390	size_t out_len;
	391	unsigned char compressed[STREAM_BUFFER_SIZE * 2];
	392
c3c2e1a0	393	git_deflate_init_raw(&zstream, args->compression_level);
c743c215 RS	394
	395	compressed_size = 0;
	396	zstream.next_out = compressed;
	397	zstream.avail_out = sizeof(compressed);
	398
	399	for (;;) {
	400	readlen = read_istream(stream, buf, sizeof(buf));
	401	if (readlen <= 0)
	402	break;
	403	crc = crc32(crc, buf, readlen);
4aff646d RS	404	if (is_binary == -1)
	405	is_binary = entry_is_binary(path_without_prefix,
	406	buf, readlen);
c743c215 RS	407
	408	zstream.next_in = buf;
	409	zstream.avail_in = readlen;
	410	result = git_deflate(&zstream, 0);
	411	if (result != Z_OK)
	412	die("deflate error (%d)", result);
c3c2e1a0	413	out_len = zstream.next_out - compressed;
c743c215 RS	414
c743c215 RS	415	if (out_len > 0) {
c3c2e1a0	416	write_or_die(1, compressed, out_len);
c743c215 RS	417	compressed_size += out_len;
	418	zstream.next_out = compressed;
	419	zstream.avail_out = sizeof(compressed);
	420	}
	421
	422	}
	423	close_istream(stream);
	424	if (readlen)
	425	return readlen;
	426
	427	zstream.next_in = buf;
	428	zstream.avail_in = 0;
	429	result = git_deflate(&zstream, Z_FINISH);
	430	if (result != Z_STREAM_END)
	431	die("deflate error (%d)", result);
	432
	433	git_deflate_end(&zstream);
c3c2e1a0 RS	434	out_len = zstream.next_out - compressed;
c3c2e1a0 RS	435	write_or_die(1, compressed, out_len);
c743c215 RS	436	compressed_size += out_len;
	437	zip_offset += compressed_size;
	438
	439	write_zip_data_desc(size, compressed_size, crc);
	440	zip_offset += ZIP_DATA_DESC_SIZE;
2158f883	441	} else if (compressed_size > 0) {
e4fbbfe9 RS	442	write_or_die(1, out, compressed_size);
	443	zip_offset += compressed_size;
	444	}
	445
e4fbbfe9	446	free(deflated);
9cb513b7	447	free(buffer);
e4fbbfe9	448
af95749f RS	449	if (offset > 0xffffffff) {
	450	zip64_dir_extra_payload_size += 8;
	451	zip_dir_extra_size += 2 + 2 + zip64_dir_extra_payload_size;
	452	}
	453
3c78fd80 RS	454	strbuf_add_le(&zip_dir, 4, 0x02014b50); /* magic */
	455	strbuf_add_le(&zip_dir, 2, creator_version);
	456	strbuf_add_le(&zip_dir, 2, 10); /* version */
	457	strbuf_add_le(&zip_dir, 2, flags);
	458	strbuf_add_le(&zip_dir, 2, method);
	459	strbuf_add_le(&zip_dir, 2, zip_time);
	460	strbuf_add_le(&zip_dir, 2, zip_date);
	461	strbuf_add_le(&zip_dir, 4, crc);
	462	strbuf_add_le(&zip_dir, 4, compressed_size);
	463	strbuf_add_le(&zip_dir, 4, size);
	464	strbuf_add_le(&zip_dir, 2, pathlen);
af95749f	465	strbuf_add_le(&zip_dir, 2, zip_dir_extra_size);
3c78fd80 RS	466	strbuf_add_le(&zip_dir, 2, 0); /* comment length */
	467	strbuf_add_le(&zip_dir, 2, 0); /* disk */
	468	strbuf_add_le(&zip_dir, 2, !is_binary);
	469	strbuf_add_le(&zip_dir, 4, attr2);
af95749f	470	strbuf_add_le(&zip_dir, 4, clamp32(offset));
c061a149 RS	471	strbuf_add(&zip_dir, path, pathlen);
c061a149 RS	472	strbuf_add(&zip_dir, &extra, ZIP_EXTRA_MTIME_SIZE);
af95749f RS	473	if (zip64_dir_extra_payload_size) {
	474	strbuf_add_le(&zip_dir, 2, 0x0001); /* magic */
	475	strbuf_add_le(&zip_dir, 2, zip64_dir_extra_payload_size);
	476	if (offset >= 0xffffffff)
	477	strbuf_add_le(&zip_dir, 8, offset);
	478	}
ebf5374a RS	479	zip_dir_entries++;
ebf5374a RS	480
562e25ab	481	return 0;
e4fbbfe9 RS	482	}
e4fbbfe9 RS	483
88329ca8 RS	484	static void write_zip64_trailer(void)
	485	{
	486	struct zip64_dir_trailer trailer64;
	487	struct zip64_dir_trailer_locator locator64;
	488
	489	copy_le32(trailer64.magic, 0x06064b50);
	490	copy_le64(trailer64.record_size, ZIP64_DIR_TRAILER_RECORD_SIZE);
	491	copy_le16(trailer64.creator_version, max_creator_version);
	492	copy_le16(trailer64.version, 45);
	493	copy_le32(trailer64.disk, 0);
	494	copy_le32(trailer64.directory_start_disk, 0);
	495	copy_le64(trailer64.entries_on_this_disk, zip_dir_entries);
	496	copy_le64(trailer64.entries, zip_dir_entries);
c061a149	497	copy_le64(trailer64.size, zip_dir.len);
88329ca8 RS	498	copy_le64(trailer64.offset, zip_offset);
	499
	500	copy_le32(locator64.magic, 0x07064b50);
	501	copy_le32(locator64.disk, 0);
c061a149	502	copy_le64(locator64.offset, zip_offset + zip_dir.len);
88329ca8 RS	503	copy_le32(locator64.number_of_disks, 1);
	504
	505	write_or_die(1, &trailer64, ZIP64_DIR_TRAILER_SIZE);
	506	write_or_die(1, &locator64, ZIP64_DIR_TRAILER_LOCATOR_SIZE);
	507	}
	508
e4fbbfe9 RS	509	static void write_zip_trailer(const unsigned char *sha1)
	510	{
	511	struct zip_dir_trailer trailer;
88329ca8	512	int clamped = 0;
e4fbbfe9 RS	513
	514	copy_le32(trailer.magic, 0x06054b50);
	515	copy_le16(trailer.disk, 0);
	516	copy_le16(trailer.directory_start_disk, 0);
88329ca8 RS	517	copy_le16_clamp(trailer.entries_on_this_disk, zip_dir_entries,
	518	&clamped);
	519	copy_le16_clamp(trailer.entries, zip_dir_entries, &clamped);
c061a149	520	copy_le32(trailer.size, zip_dir.len);
af95749f	521	copy_le32_clamp(trailer.offset, zip_offset, &clamped);
aeecdcd4	522	copy_le16(trailer.comment_length, sha1 ? GIT_SHA1_HEXSZ : 0);
e4fbbfe9	523
c061a149	524	write_or_die(1, zip_dir.buf, zip_dir.len);
88329ca8 RS	525	if (clamped)
88329ca8 RS	526	write_zip64_trailer();
0ea865ce	527	write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
e4fbbfe9	528	if (sha1)
aeecdcd4	529	write_or_die(1, sha1_to_hex(sha1), GIT_SHA1_HEXSZ);
e4fbbfe9 RS	530	}
	531
	532	static void dos_time(time_t time, int dos_date, int *dos_time)
	533	{
	534	struct tm *t = localtime(time);
	535
	536	dos_date = t->tm_mday + (t->tm_mon + 1) 32 +
	537	(t->tm_year + 1900 - 1980) * 512;
	538	dos_time = t->tm_sec / 2 + t->tm_min 32 + t->tm_hour * 2048;
	539	}
	540
965cba2e JK	541	static int archive_zip_config(const char var, const char value, void *data)
	542	{
	543	return userdiff_config(var, value);
	544	}
	545
4d7c9898 JK	546	static int write_zip_archive(const struct archiver *ar,
4d7c9898 JK	547	struct archiver_args *args)
ec06bff5	548	{
562e25ab RS	549	int err;
562e25ab RS	550
965cba2e JK	551	git_config(archive_zip_config, NULL);
965cba2e JK	552
ec06bff5 FBH	553	dos_time(&args->time, &zip_date, &zip_time);
ec06bff5 FBH	554
c061a149	555	strbuf_init(&zip_dir, 0);
562e25ab RS	556
	557	err = write_archive_entries(args, write_zip_entry);
	558	if (!err)
	559	write_zip_trailer(args->commit_sha1);
ec06bff5	560
c061a149	561	strbuf_release(&zip_dir);
ec06bff5	562
562e25ab	563	return err;
ec06bff5	564	}
13e0f88d JK	565
	566	static struct archiver zip_archiver = {
	567	"zip",
	568	write_zip_archive,
7b97730b	569	ARCHIVER_WANT_COMPRESSION_LEVELS\|ARCHIVER_REMOTE
13e0f88d JK	570	};
	571
	572	void init_zip_archiver(void)
	573	{
	574	register_archiver(&zip_archiver);
	575	}