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Enable compression for CD sector suffix blocks and handle memory allocation for LZMA

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Natalia Portillo
2025-10-06 17:07:49 +01:00
parent 833dc38a0e
commit ed74853297
1 changed files with 51 additions and 7 deletions
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54
src/close.c
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@@ -881,7 +881,7 @@ static void write_sector_prefix(aaruformatContext *ctx)
*
* Layout considerations:
* - The block length is exactly the number of bytes copied (ctx->sector_suffix_offset).
* - No compression is applied; CRC64 is calculated on the raw suffix stream for integrity.
* - Compression is applied if enabled; CRC64 is calculated on the raw suffix stream for integrity.
* - The write position is aligned to the DDT block alignment (2^blockAlignmentShift).
*
* Indexing: An IndexEntry is appended so later readers can locate the suffix collection. Absence
@@ -912,22 +912,64 @@ static void write_sector_suffix(aaruformatContext *ctx)
BlockHeader suffix_block = {0};
suffix_block.identifier = DataBlock;
suffix_block.type = CdSectorSuffix;
suffix_block.compression = None;
suffix_block.compression = ctx->compression_enabled ? Lzma : None;
suffix_block.length = (uint32_t)ctx->sector_suffix_offset;
suffix_block.cmpLength = suffix_block.length;
// Calculate CRC64
suffix_block.crc64 = aaruf_crc64_data(ctx->sector_suffix, suffix_block.length);
uint8_t *buffer = NULL;
uint8_t lzma_properties[LZMA_PROPERTIES_LENGTH] = {0};
if(suffix_block.compression == None)
{
buffer = ctx->sector_suffix;
suffix_block.cmpCrc64 = suffix_block.crc64;
}
else
{
buffer = malloc((size_t)suffix_block.length * 2); // Allocate double size for compression
if(buffer == NULL)
{
TRACE("Failed to allocate memory for CD sector suffix compression");
return;
}
size_t dst_size = (size_t)suffix_block.length * 2 * 2;
size_t props_size = LZMA_PROPERTIES_LENGTH;
aaruf_lzma_encode_buffer(buffer, &dst_size, ctx->sector_suffix, suffix_block.length, lzma_properties,
&props_size, 9, ctx->lzma_dict_size, 4, 0, 2, 273, 8);
suffix_block.cmpLength = (uint32_t)dst_size;
if(suffix_block.cmpLength >= suffix_block.length)
{
suffix_block.compression = None;
free(buffer);
buffer = ctx->sector_suffix;
}
}
if(suffix_block.compression == None)
{
suffix_block.cmpLength = suffix_block.length;
suffix_block.cmpCrc64 = suffix_block.crc64;
}
else
suffix_block.cmpCrc64 = aaruf_crc64_data(buffer, suffix_block.cmpLength);
if(suffix_block.compression == Lzma) suffix_block.cmpLength += LZMA_PROPERTIES_LENGTH;
// Write header
if(fwrite(&suffix_block, sizeof(BlockHeader), 1, ctx->imageStream) == 1)
{
if(suffix_block.compression == Lzma) fwrite(lzma_properties, LZMA_PROPERTIES_LENGTH, 1, ctx->imageStream);
// Write data
const size_t written_bytes = fwrite(ctx->sector_suffix, suffix_block.length, 1, ctx->imageStream);
const size_t written_bytes = fwrite(buffer, suffix_block.cmpLength, 1, ctx->imageStream);
if(written_bytes == 1)
{
TRACE("Successfully wrote CD sector suffix block (%" PRIu64 " bytes)", suffix_block.length);
TRACE("Successfully wrote CD sector suffix block (%" PRIu64 " bytes)", suffix_block.cmpLength);
// Add suffix block to index
TRACE("Adding CD sector suffix block to index");
IndexEntry suffix_index_entry;
@@ -938,6 +980,8 @@ static void write_sector_suffix(aaruformatContext *ctx)
TRACE("Added CD sector suffix block index entry at offset %" PRIu64, suffix_position);
}
}
if(suffix_block.compression == Lzma) free(buffer);
}
/**