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Update nextBlockPosition calculation for aligned block writing

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This commit is contained in:
Natalia Portillo
2025-09-28 18:43:44 +01:00
parent d4040e10af
commit 201a1d7022
2 changed files with 11 additions and 8 deletions
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5
src/ddt/ddt_v2.c
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@@ -1039,6 +1039,11 @@ void set_ddt_multi_level_v2(aaruformatContext *ctx, uint64_t sectorAddress, bool
return;
}
// Update nextBlockPosition to ensure future blocks don't overwrite the DDT
uint64_t ddtTotalSize = sizeof(DdtHeader2) + ddtHeader.length;
ctx->nextBlockPosition = (endOfFile + ddtTotalSize + alignmentMask) & ~alignmentMask;
TRACE("Updated nextBlockPosition after DDT write to %" PRIu64, ctx->nextBlockPosition);
fseek(ctx->imageStream, savedPos, SEEK_SET);
// Free the cached table

14
src/write.c
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@@ -112,14 +112,6 @@ int32_t aaruf_write_sector(void *context, uint64_t sectorAddress, uint8_t *data,
TRACE("Initializing CRC64 context");
ctx->crc64Context = aaruf_crc64_init();
// Get current file position
long pos = ftell(ctx->imageStream);
TRACE("Saving current file position as next block position: %ld", pos);
// Calculate and save next block aligned position
ctx->nextBlockPosition =
pos / (1 << ctx->userDataDdtHeader.blockAlignmentShift) * (1 << ctx->userDataDdtHeader.blockAlignmentShift);
}
TRACE("Copying data to writing buffer at position %zu", ctx->writingBufferPosition);
@@ -176,6 +168,12 @@ int32_t aaruf_close_current_block(aaruformatContext *ctx)
if(fwrite(ctx->writingBuffer, ctx->currentBlockHeader.length, 1, ctx->imageStream) != 1)
return AARUF_ERROR_CANNOT_WRITE_BLOCK_DATA;
// Update nextBlockPosition to point to the next available aligned position
uint64_t blockTotalSize = sizeof(BlockHeader) + ctx->currentBlockHeader.cmpLength;
uint64_t alignmentMask = (1ULL << ctx->userDataDdtHeader.blockAlignmentShift) - 1;
ctx->nextBlockPosition = (ctx->nextBlockPosition + blockTotalSize + alignmentMask) & ~alignmentMask;
TRACE("Updated nextBlockPosition to %" PRIu64, ctx->nextBlockPosition);
// Clear values
free(ctx->writingBuffer);
ctx->writingBuffer = NULL;