linux/lib/xz/xz_stream.h
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   1/*
   2 * Definitions for handling the .xz file format
   3 *
   4 * Author: Lasse Collin <lasse.collin@tukaani.org>
   5 *
   6 * This file has been put into the public domain.
   7 * You can do whatever you want with this file.
   8 */
   9
  10#ifndef XZ_STREAM_H
  11#define XZ_STREAM_H
  12
  13#if defined(__KERNEL__) && !XZ_INTERNAL_CRC32
  14#       include <linux/crc32.h>
  15#       undef crc32
  16#       define xz_crc32(buf, size, crc) \
  17                (~crc32_le(~(uint32_t)(crc), buf, size))
  18#endif
  19
  20/*
  21 * See the .xz file format specification at
  22 * http://tukaani.org/xz/xz-file-format.txt
  23 * to understand the container format.
  24 */
  25
  26#define STREAM_HEADER_SIZE 12
  27
  28#define HEADER_MAGIC "\3757zXZ"
  29#define HEADER_MAGIC_SIZE 6
  30
  31#define FOOTER_MAGIC "YZ"
  32#define FOOTER_MAGIC_SIZE 2
  33
  34/*
  35 * Variable-length integer can hold a 63-bit unsigned integer or a special
  36 * value indicating that the value is unknown.
  37 *
  38 * Experimental: vli_type can be defined to uint32_t to save a few bytes
  39 * in code size (no effect on speed). Doing so limits the uncompressed and
  40 * compressed size of the file to less than 256 MiB and may also weaken
  41 * error detection slightly.
  42 */
  43typedef uint64_t vli_type;
  44
  45#define VLI_MAX ((vli_type)-1 / 2)
  46#define VLI_UNKNOWN ((vli_type)-1)
  47
  48/* Maximum encoded size of a VLI */
  49#define VLI_BYTES_MAX (sizeof(vli_type) * 8 / 7)
  50
  51/* Integrity Check types */
  52enum xz_check {
  53        XZ_CHECK_NONE = 0,
  54        XZ_CHECK_CRC32 = 1,
  55        XZ_CHECK_CRC64 = 4,
  56        XZ_CHECK_SHA256 = 10
  57};
  58
  59/* Maximum possible Check ID */
  60#define XZ_CHECK_MAX 15
  61
  62#endif
  63
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