diff options
Diffstat (limited to 'src/liblzma/common/block_header_decoder.c')
| -rw-r--r-- | src/liblzma/common/block_header_decoder.c | 41 |
1 files changed, 22 insertions, 19 deletions
diff --git a/src/liblzma/common/block_header_decoder.c b/src/liblzma/common/block_header_decoder.c index 8421ac37..82afb425 100644 --- a/src/liblzma/common/block_header_decoder.c +++ b/src/liblzma/common/block_header_decoder.c @@ -1,7 +1,7 @@ /////////////////////////////////////////////////////////////////////////////// // /// \file block_header_decoder.c -/// \brief Decodes Block Header from .lzma files +/// \brief Decodes Block Header from .xz files // // Copyright (C) 2007 Lasse Collin // @@ -22,15 +22,15 @@ static void -free_properties(lzma_block *options, lzma_allocator *allocator) +free_properties(lzma_block *block, lzma_allocator *allocator) { // Free allocated filter options. The last array member is not // touched after the initialization in the beginning of // lzma_block_header_decode(), so we don't need to touch that here. for (size_t i = 0; i < LZMA_FILTERS_MAX; ++i) { - lzma_free(options->filters[i].options, allocator); - options->filters[i].id = LZMA_VLI_UNKNOWN; - options->filters[i].options = NULL; + lzma_free(block->filters[i].options, allocator); + block->filters[i].id = LZMA_VLI_UNKNOWN; + block->filters[i].options = NULL; } return; @@ -38,7 +38,7 @@ free_properties(lzma_block *options, lzma_allocator *allocator) extern LZMA_API lzma_ret -lzma_block_header_decode(lzma_block *options, +lzma_block_header_decode(lzma_block *block, lzma_allocator *allocator, const uint8_t *in) { // NOTE: We consider the header to be corrupt not only when the @@ -49,18 +49,21 @@ lzma_block_header_decode(lzma_block *options, // Initialize the filter options array. This way the caller can // safely free() the options even if an error occurs in this function. for (size_t i = 0; i <= LZMA_FILTERS_MAX; ++i) { - options->filters[i].id = LZMA_VLI_UNKNOWN; - options->filters[i].options = NULL; + block->filters[i].id = LZMA_VLI_UNKNOWN; + block->filters[i].options = NULL; } + // Always zero for now. + block->version = 0; + // Validate Block Header Size and Check type. The caller must have // already set these, so it is a programming error if this test fails. - if (lzma_block_header_size_decode(in[0]) != options->header_size - || (unsigned int)(options->check) > LZMA_CHECK_ID_MAX) + if (lzma_block_header_size_decode(in[0]) != block->header_size + || (unsigned int)(block->check) > LZMA_CHECK_ID_MAX) return LZMA_PROG_ERROR; // Exclude the CRC32 field. - const size_t in_size = options->header_size - 4; + const size_t in_size = block->header_size - 4; // Verify CRC32 if (lzma_crc32(in, in_size, 0) != integer_read_32(in + in_size)) @@ -75,32 +78,32 @@ lzma_block_header_decode(lzma_block *options, // Compressed Size if (in[1] & 0x40) { - return_if_error(lzma_vli_decode(&options->compressed_size, + return_if_error(lzma_vli_decode(&block->compressed_size, NULL, in, &in_pos, in_size)); // Validate Compressed Size. This checks that it isn't zero // and that the total size of the Block is a valid VLI. - if (lzma_block_unpadded_size(options) == 0) + if (lzma_block_unpadded_size(block) == 0) return LZMA_DATA_ERROR; } else { - options->compressed_size = LZMA_VLI_UNKNOWN; + block->compressed_size = LZMA_VLI_UNKNOWN; } // Uncompressed Size if (in[1] & 0x80) - return_if_error(lzma_vli_decode(&options->uncompressed_size, + return_if_error(lzma_vli_decode(&block->uncompressed_size, NULL, in, &in_pos, in_size)); else - options->uncompressed_size = LZMA_VLI_UNKNOWN; + block->uncompressed_size = LZMA_VLI_UNKNOWN; // Filter Flags const size_t filter_count = (in[1] & 3) + 1; for (size_t i = 0; i < filter_count; ++i) { const lzma_ret ret = lzma_filter_flags_decode( - &options->filters[i], allocator, + &block->filters[i], allocator, in, &in_pos, in_size); if (ret != LZMA_OK) { - free_properties(options, allocator); + free_properties(block, allocator); return ret; } } @@ -108,7 +111,7 @@ lzma_block_header_decode(lzma_block *options, // Padding while (in_pos < in_size) { if (in[in_pos++] != 0x00) { - free_properties(options, allocator); + free_properties(block, allocator); // Possibly some new field present so use // LZMA_OPTIONS_ERROR instead of LZMA_DATA_ERROR. |