#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 {

};

struct zip_data_desc {

};

struct zip_dir_header {

};

struct zip_dir_trailer {

};

struct zip_extra_mtime {

};

struct zip64_dir_trailer {

};

struct zip64_dir_trailer_locator {

};

#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);

}