FreeBSD/Linux Kernel Cross Reference
sys/contrib/xz-embedded/linux/lib/xz/xz_stream.h

     /*
      * Definitions for handling the .xz file format
      *
      * Author: Lasse Collin <lasse.collin@tukaani.org>
      *
      * This file has been put into the public domain.
      * You can do whatever you want with this file.
      */
     
    #ifndef XZ_STREAM_H
    #define XZ_STREAM_H
    
    #if defined(__KERNEL__) && !XZ_INTERNAL_CRC32
    #       include <linux/crc32.h>
    #       undef crc32
    #       define xz_crc32(buf, size, crc) \
                    (~crc32_le(~(uint32_t)(crc), buf, size))
    #endif
    
    /*
     * See the .xz file format specification at
     * https://tukaani.org/xz/xz-file-format.txt
     * to understand the container format.
     */
    
    #define STREAM_HEADER_SIZE 12
    
    #define HEADER_MAGIC "\3757zXZ"
    #define HEADER_MAGIC_SIZE 6
    
    #define FOOTER_MAGIC "YZ"
    #define FOOTER_MAGIC_SIZE 2
    
    /*
     * Variable-length integer can hold a 63-bit unsigned integer or a special
     * value indicating that the value is unknown.
     *
     * Experimental: vli_type can be defined to uint32_t to save a few bytes
     * in code size (no effect on speed). Doing so limits the uncompressed and
     * compressed size of the file to less than 256 MiB and may also weaken
     * error detection slightly.
     */
    typedef uint64_t vli_type;
    
    #define VLI_MAX ((vli_type)-1 / 2)
    #define VLI_UNKNOWN ((vli_type)-1)
    
    /* Maximum encoded size of a VLI */
    #define VLI_BYTES_MAX (sizeof(vli_type) * 8 / 7)
    
    /* Integrity Check types */
    enum xz_check {
            XZ_CHECK_NONE = 0,
            XZ_CHECK_CRC32 = 1,
            XZ_CHECK_CRC64 = 4,
            XZ_CHECK_SHA256 = 10
    };
    
    /* Maximum possible Check ID */
    #define XZ_CHECK_MAX 15
    
    #endif

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