/*

* Copyright (c) 2006 Rene Scharfe

*/

#define USE_THE_REPOSITORY_VARIABLE

#include "git-compat-util.h"

#include "config.h"

#include "archive.h"

#include "gettext.h"

#include "git-zlib.h"

#include "hex.h"

#include "utf8.h"

#include "odb.h"

#include "odb/streaming.h"

#include "strbuf.h"

#include "userdiff.h"

#include "write-or-die.h"

#include "xdiff-interface.h"

#include "date.h"

static int zip_date;

static int zip_time;

/* We only care about the "buf" part here. */

static struct strbuf zip_dir;

static struct strbuf zip_extra_mtime;

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)

enum zip_method {

ZIP_METHOD_STORE = 0,

ZIP_METHOD_DEFLATE = 8

};

struct zip_local_header {

unsigned char magic[4];

unsigned char version[2];

unsigned char flags[2];

unsigned char compression_method[2];

unsigned char mtime[2];

unsigned char mdate[2];

unsigned char crc32[4];

unsigned char compressed_size[4];

unsigned char size[4];

unsigned char filename_length[2];

unsigned char extra_length[2];

unsigned char _end[1];

};

struct zip_data_desc {

unsigned char magic[4];

unsigned char crc32[4];

unsigned char compressed_size[4];

unsigned char size[4];

unsigned char _end[1];

};

struct zip64_data_desc {

unsigned char magic[4];

unsigned char crc32[4];

unsigned char compressed_size[8];

unsigned char size[8];

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 zip64_extra {

unsigned char magic[2];

unsigned char extra_size[2];

unsigned char size[8];

unsigned char compressed_size[8];

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 ZIP64_DATA_DESC_SIZE offsetof(struct zip64_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 ZIP64_EXTRA_SIZE offsetof(struct zip64_extra, _end)

#define ZIP64_EXTRA_PAYLOAD_SIZE \

(ZIP64_EXTRA_SIZE - offsetof(struct zip64_extra, size))

#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;

size_t 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)

{

if (size >= 0xffffffff || compressed_size >= 0xffffffff) {

struct zip64_data_desc trailer;

copy_le32(trailer.magic, 0x08074b50);

copy_le32(trailer.crc32, crc);

copy_le64(trailer.compressed_size, compressed_size);

copy_le64(trailer.size, size);

write_or_die(1, &trailer, ZIP64_DATA_DESC_SIZE);

zip_offset += ZIP64_DATA_DESC_SIZE;

} else {

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);

zip_offset += 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(struct index_state *istate, const char *path,

const void *buffer, size_t size)

{

struct userdiff_driver *driver = userdiff_find_by_path(istate, 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 struct object_id *oid,

const char *path, size_t pathlen,

unsigned int mode,

void *buffer, unsigned long size)

{

struct zip_local_header header;

uintmax_t offset = zip_offset;

struct zip64_extra extra64;

size_t header_extra_size = zip_extra_mtime.len;

int need_zip64_extra = 0;

unsigned long attr2;

unsigned long compressed_size;

unsigned long crc;

enum zip_method method;

unsigned char *out;

void *deflated = NULL;

struct odb_stream *stream = NULL;

unsigned long flags = 0;

int is_binary = -1;

const char *path_without_prefix = path + args->baselen;

unsigned int creator_version = 0;

unsigned int version_needed = 10;

size_t zip_dir_extra_size = zip_extra_mtime.len;

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, oid_to_hex(oid), path);

}

if (S_ISDIR(mode) || S_ISGITLINK(mode)) {

method = ZIP_METHOD_STORE;

attr2 = 16;

out = NULL;

compressed_size = 0;

} else if (S_ISREG(mode) || S_ISLNK(mode)) {

method = ZIP_METHOD_STORE;

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 = ZIP_METHOD_DEFLATE;

if (!buffer) {

stream = odb_stream_from_object(args->repo->objects, oid, NULL);

if (!stream)

return error(_("cannot stream blob %s"),

oid_to_hex(oid));

size = stream->size;

flags |= ZIP_STREAM;

out = NULL;

} else {

crc = crc32(crc, buffer, size);

is_binary = entry_is_binary(args->repo->index,

path_without_prefix,

buffer, size);

out = buffer;

}

compressed_size = (method == ZIP_METHOD_STORE) ? size : 0;

} else {

return error(_("unsupported file mode: 0%o (SHA1: %s)"), mode,

oid_to_hex(oid));

}

if (creator_version > max_creator_version)

max_creator_version = creator_version;

if (buffer && method == ZIP_METHOD_DEFLATE) {

out = deflated = zlib_deflate_raw(buffer, size,

args->compression_level,

&compressed_size);

if (!out || compressed_size >= size) {

out = buffer;

method = ZIP_METHOD_STORE;

compressed_size = size;

}

}

if (size > 0xffffffff || compressed_size > 0xffffffff)

need_zip64_extra = 1;

if (stream && size > 0x7fffffff)

need_zip64_extra = 1;

if (need_zip64_extra)

version_needed = 45;

copy_le32(header.magic, 0x04034b50);

copy_le16(header.version, version_needed);

copy_le16(header.flags, flags);

copy_le16(header.compression_method, method);

copy_le16(header.mtime, zip_time);

copy_le16(header.mdate, zip_date);

if (need_zip64_extra) {

set_zip_header_data_desc(&header, 0xffffffff, 0xffffffff, crc);

header_extra_size += ZIP64_EXTRA_SIZE;

} else {

set_zip_header_data_desc(&header, size, compressed_size, crc);

}

copy_le16(header.filename_length, pathlen);

copy_le16(header.extra_length, header_extra_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, zip_extra_mtime.buf, zip_extra_mtime.len);

zip_offset += zip_extra_mtime.len;

if (need_zip64_extra) {

copy_le16(extra64.magic, 0x0001);

copy_le16(extra64.extra_size, ZIP64_EXTRA_PAYLOAD_SIZE);

copy_le64(extra64.size, size);

copy_le64(extra64.compressed_size, compressed_size);

write_or_die(1, &extra64, ZIP64_EXTRA_SIZE);

zip_offset += ZIP64_EXTRA_SIZE;

}

if (stream && method == ZIP_METHOD_STORE) {

unsigned char buf[STREAM_BUFFER_SIZE];

ssize_t readlen;

for (;;) {

readlen = odb_stream_read(stream, buf, sizeof(buf));

if (readlen <= 0)

break;

crc = crc32(crc, buf, readlen);

if (is_binary == -1)

is_binary = entry_is_binary(args->repo->index,

path_without_prefix,

buf, readlen);

write_or_die(1, buf, readlen);

}

odb_stream_close(stream);

if (readlen)

return readlen;

compressed_size = size;

zip_offset += compressed_size;

write_zip_data_desc(size, compressed_size, crc);

} else if (stream && method == ZIP_METHOD_DEFLATE) {

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 = odb_stream_read(stream, buf, sizeof(buf));

if (readlen <= 0)

break;

crc = crc32(crc, buf, readlen);

if (is_binary == -1)

is_binary = entry_is_binary(args->repo->index,

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);

}

}

odb_stream_close(stream);

if (readlen)

return readlen;

zstream.next_in = buf;

zstream.avail_in = 0;

do {

result = git_deflate(&zstream, Z_FINISH);

if (result != Z_OK && result != Z_STREAM_END)

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);

}

} while (result != Z_STREAM_END);

git_deflate_end(&zstream);

zip_offset += compressed_size;

write_zip_data_desc(size, compressed_size, crc);

} else if (compressed_size > 0) {

write_or_die(1, out, compressed_size);

zip_offset += compressed_size;

}

free(deflated);

if (compressed_size > 0xffffffff || size > 0xffffffff ||

offset > 0xffffffff) {

if (compressed_size >= 0xffffffff)

zip64_dir_extra_payload_size += 8;

if (size >= 0xffffffff)

zip64_dir_extra_payload_size += 8;

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, version_needed);

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, clamp32(compressed_size));

strbuf_add_le(&zip_dir, 4, clamp32(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_addbuf(&zip_dir, &zip_extra_mtime);

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 (size >= 0xffffffff)

strbuf_add_le(&zip_dir, 8, size);

if (compressed_size >= 0xffffffff)

strbuf_add_le(&zip_dir, 8, compressed_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 struct object_id *oid)

{

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, oid ? the_hash_algo->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 (oid)

write_or_die(1, oid_to_hex(oid), the_hash_algo->hexsz);

}

static void dos_time(timestamp_t *timestamp, int *dos_date, int *dos_time)

{

time_t time;

struct tm tm;

if (date_overflows(*timestamp))

die(_("timestamp too large for this system: %"PRItime),

*timestamp);

time = (time_t)*timestamp;

localtime_r(&time, &tm);

*timestamp = time;

*dos_date = tm.tm_mday + (tm.tm_mon + 1) * 32 +

(tm.tm_year + 1900 - 1980) * 512;

*dos_time = tm.tm_sec / 2 + tm.tm_min * 32 + tm.tm_hour * 2048;

}

static int archive_zip_config(const char *var, const char *value,

const struct config_context *ctx UNUSED,

void *data UNUSED)

{

return userdiff_config(var, value);

}

static int write_zip_archive(const struct archiver *ar UNUSED,

struct archiver_args *args)

{

int err;

repo_config(the_repository, archive_zip_config, NULL);

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

strbuf_init(&zip_dir, 0);

strbuf_init(&zip_extra_mtime, 0);

if (args->time <= 0x7fffffff) {

strbuf_add_le(&zip_extra_mtime, 2, 0x5455); /* magic */

strbuf_add_le(&zip_extra_mtime, 2, 1 + 4); /* payload size */

strbuf_add_le(&zip_extra_mtime, 1, 1); /* flags; just mtime */

strbuf_add_le(&zip_extra_mtime, 4, args->time);

}

err = write_archive_entries(args, write_zip_entry);

if (!err)

write_zip_trailer(args->commit_oid);

strbuf_release(&zip_dir);

strbuf_release(&zip_extra_mtime);

return err;

}

static struct archiver zip_archiver = {

.name = "zip",

.write_archive = write_zip_archive,

.flags = ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE,

};

void init_zip_archiver(void)

{

register_archiver(&zip_archiver);

}