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Add support for writing MODE 2 subheaders block in close.c

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Natalia Portillo
2025-10-03 19:08:47 +01:00
parent 879a41d5a1
commit 8c9c0c8678
1 changed files with 51 additions and 0 deletions
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51
src/close.c
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@@ -158,6 +158,10 @@
* @note Resource Ownership (Clarification):
* - All dynamically allocated checksum buffers (e.g., SpamSum string) and cryptographic contexts are finalized
* or freed prior to context memory release
*
* @note Mode 2 Subheaders Block:
* - If mode2_subheaders is present it is serialized as a DataBlock with type CompactDiscMode2Subheader, CRC64
* protected and indexed similarly to other appended metadata blocks.
*/
int aaruf_close(void *context)
{
@@ -704,6 +708,53 @@ int aaruf_close(void *context)
}
}
// Write MODE 2 subheader data block
if(ctx->mode2_subheaders != NULL)
{
fseek(ctx->imageStream, 0, SEEK_END);
long mode2_subheaders_position = ftell(ctx->imageStream);
// Align index position to block boundary if needed
alignment_mask = (1ULL << ctx->userDataDdtHeader.blockAlignmentShift) - 1;
if(mode2_subheaders_position & alignment_mask)
{
aligned_position = mode2_subheaders_position + alignment_mask & ~alignment_mask;
fseek(ctx->imageStream, aligned_position, SEEK_SET);
mode2_subheaders_position = aligned_position;
}
TRACE("Writing MODE 2 subheaders block at position %ld", mode2_subheaders_position);
BlockHeader subheaders_block = {0};
subheaders_block.identifier = DataBlock;
subheaders_block.type = CompactDiscMode2Subheader;
subheaders_block.compression = None;
subheaders_block.length =
(uint32_t)(ctx->userDataDdtHeader.negative + ctx->imageInfo.Sectors + ctx->userDataDdtHeader.overflow);
subheaders_block.cmpLength = subheaders_block.length;
// Calculate CRC64
subheaders_block.crc64 = aaruf_crc64_data(ctx->mode2_subheaders, subheaders_block.length);
subheaders_block.cmpCrc64 = subheaders_block.crc64;
// Write header
if(fwrite(&subheaders_block, sizeof(BlockHeader), 1, ctx->imageStream) == 1)
{
// Write data
size_t written_bytes = fwrite(ctx->mode2_subheaders, subheaders_block.length, 1, ctx->imageStream);
if(written_bytes == 1)
{
TRACE("Successfully wrote MODE 2 subheaders block (%" PRIu64 " bytes)", subheaders_block.length);
// Add MODE 2 subheaders block to index
TRACE("Adding MODE 2 subheaders block to index");
IndexEntry mode2_subheaders_index_entry;
mode2_subheaders_index_entry.blockType = DataBlock;
mode2_subheaders_index_entry.dataType = CompactDiscMode2Subheader;
mode2_subheaders_index_entry.offset = mode2_subheaders_position;
utarray_push_back(ctx->indexEntries, &mode2_subheaders_index_entry);
TRACE("Added MODE 2 subheaders block index entry at offset %" PRIu64, mode2_subheaders_position);
}
}
}
// Write the complete index at the end of the file
TRACE("Writing index at the end of the file");
fseek(ctx->imageStream, 0, SEEK_END);