///////////////////////////////////////////////////////////////////////////////

//

/// \file       stream_flags_common.c

/// \brief      Common stuff for Stream flags coders

//

//  Author:     Lasse Collin

//

//  This file has been put into the public domain.

//  You can do whatever you want with this file.

//

///////////////////////////////////////////////////////////////////////////////

#include "stream_flags_common.h"

const uint8_t lzma_header_magic[6] = { 0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00 };

const uint8_t lzma_footer_magic[2] = { 0x59, 0x5A };

extern LZMA_API(lzma_ret)

lzma_stream_flags_compare(

    const lzma_stream_flags *a, const lzma_stream_flags *b)

{

  // We can compare only version 0 structures.

  if (a->version != 0 || b->version != 0)

    return LZMA_OPTIONS_ERROR;

  // Check type

  if ((unsigned int)(a->check) > LZMA_CHECK_ID_MAX

      || (unsigned int)(b->check) > LZMA_CHECK_ID_MAX)

    return LZMA_PROG_ERROR;

  if (a->check != b->check)

    return LZMA_DATA_ERROR;

  // Backward Sizes are compared only if they are known in both.

  if (a->backward_size != LZMA_VLI_UNKNOWN

      && b->backward_size != LZMA_VLI_UNKNOWN) {

    if (!is_backward_size_valid(a) || !is_backward_size_valid(b))

      return LZMA_PROG_ERROR;

    if (a->backward_size != b->backward_size)

      return LZMA_DATA_ERROR;

  }

  return LZMA_OK;

}