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/*

* Copyright (c) 2006 Rene Scharfe

*/

#include "cache.h"

#include "archive.h"

static int zip_date;

static int zip_time;

static unsigned char *zip_dir;

static unsigned int zip_dir_size;

static unsigned int zip_offset;

static unsigned int zip_dir_offset;

static unsigned int zip_dir_entries;

#define ZIP_DIRECTORY_MIN_SIZE (1024 * 1024)

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_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];

};

/*

* 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_DIR_HEADER_SIZE offsetof(struct zip_dir_header, _end)

#define ZIP_DIR_TRAILER_SIZE offsetof(struct zip_dir_trailer, _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 *zlib_deflate(void *data, unsigned long size,

int compression_level, unsigned long *compressed_size)

{

z_stream stream;

unsigned long maxsize;

void *buffer;

int result;

memset(&stream, 0, sizeof(stream));

deflateInit(&stream, compression_level);

maxsize = deflateBound(&stream, size);

buffer = xmalloc(maxsize);

stream.next_in = data;

stream.avail_in = size;

stream.next_out = buffer;

stream.avail_out = maxsize;

do {

result = deflate(&stream, Z_FINISH);

} while (result == Z_OK);

if (result != Z_STREAM_END) {

free(buffer);

return NULL;

}

deflateEnd(&stream);

*compressed_size = stream.total_out;

return buffer;

}

static int write_zip_entry(struct archiver_args *args,

const unsigned char *sha1, const char *path, size_t pathlen,

unsigned int mode, void *buffer, unsigned long size)

{

struct zip_local_header header;

struct zip_dir_header dirent;

unsigned long attr2;

unsigned long compressed_size;

unsigned long uncompressed_size;

unsigned long crc;

unsigned long direntsize;

int method;

unsigned char *out;

void *deflated = NULL;

crc = crc32(0, NULL, 0);

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;

uncompressed_size = 0;

compressed_size = 0;

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

method = 0;

attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :

(mode & 0111) ? ((mode) << 16) : 0;

if (S_ISREG(mode) && args->compression_level != 0)

method = 8;

crc = crc32(crc, buffer, size);

out = buffer;

uncompressed_size = size;

compressed_size = size;

} else {

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

sha1_to_hex(sha1));

}

if (method == 8) {

deflated = zlib_deflate(buffer, size, args->compression_level,

&compressed_size);

if (deflated && compressed_size - 6 < size) {

/* ZLIB --> raw compressed data (see RFC 1950) */

/* CMF and FLG ... */

out = (unsigned char *)deflated + 2;

compressed_size -= 6; /* ... and ADLER32 */

} else {

method = 0;

compressed_size = size;

}

}

/* make sure we have enough free space in the dictionary */

direntsize = ZIP_DIR_HEADER_SIZE + pathlen;

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,

S_ISLNK(mode) || (S_ISREG(mode) && (mode & 0111)) ? 0x0317 : 0);

copy_le16(dirent.version, 10);

copy_le16(dirent.flags, 0);

copy_le16(dirent.compression_method, method);

copy_le16(dirent.mtime, zip_time);

copy_le16(dirent.mdate, zip_date);

copy_le32(dirent.crc32, crc);

copy_le32(dirent.compressed_size, compressed_size);

copy_le32(dirent.size, uncompressed_size);

copy_le16(dirent.filename_length, pathlen);

copy_le16(dirent.extra_length, 0);

copy_le16(dirent.comment_length, 0);

copy_le16(dirent.disk, 0);

copy_le16(dirent.attr1, 0);

copy_le32(dirent.attr2, attr2);

copy_le32(dirent.offset, zip_offset);

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;

zip_dir_entries++;

copy_le32(header.magic, 0x04034b50);

copy_le16(header.version, 10);

copy_le16(header.flags, 0);

copy_le16(header.compression_method, method);

copy_le16(header.mtime, zip_time);

copy_le16(header.mdate, zip_date);

copy_le32(header.crc32, crc);

copy_le32(header.compressed_size, compressed_size);

copy_le32(header.size, uncompressed_size);

copy_le16(header.filename_length, pathlen);

copy_le16(header.extra_length, 0);

write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);

zip_offset += ZIP_LOCAL_HEADER_SIZE;

write_or_die(1, path, pathlen);

zip_offset += pathlen;

if (compressed_size > 0) {

write_or_die(1, out, compressed_size);

zip_offset += compressed_size;

}

free(deflated);

return 0;

}

static void write_zip_trailer(const unsigned char *sha1)

{

struct zip_dir_trailer trailer;

copy_le32(trailer.magic, 0x06054b50);

copy_le16(trailer.disk, 0);

copy_le16(trailer.directory_start_disk, 0);

copy_le16(trailer.entries_on_this_disk, zip_dir_entries);

copy_le16(trailer.entries, zip_dir_entries);

copy_le32(trailer.size, zip_dir_offset);

copy_le32(trailer.offset, zip_offset);

copy_le16(trailer.comment_length, sha1 ? 40 : 0);

write_or_die(1, zip_dir, zip_dir_offset);

write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);

if (sha1)

write_or_die(1, sha1_to_hex(sha1), 40);

}

static void dos_time(time_t *time, int *dos_date, int *dos_time)

{

struct tm *t = localtime(time);

*dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +

(t->tm_year + 1900 - 1980) * 512;

*dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;

}

int write_zip_archive(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;

}