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Initialize primary DDT and calculate data block start position

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This commit is contained in:
Natalia Portillo
2025-09-28 18:44:33 +01:00
parent f456bcdfc6
commit c2c9d9f7d4
1 changed files with 39 additions and 0 deletions
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39
src/create.c
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@@ -165,6 +165,45 @@ void *aaruf_create(const char *filepath, uint32_t mediaType, uint32_t sectorSize
if(ctx->userDataDdtHeader.blocks % (1 << ctx->userDataDdtHeader.tableShift) != 0) ctx->userDataDdtHeader.entries++;
TRACE("Initializing primary/single DDT");
if(ctx->userDataDdtHeader.sizeType == SmallDdtSizeType)
ctx->userDataDdtMini =
(uint16_t *)calloc(ctx->userDataDdtHeader.entries, sizeof(uint16_t)); // All entries to zero
else if(ctx->userDataDdtHeader.sizeType == BigDdtSizeType)
ctx->userDataDdtBig =
(uint32_t *)calloc(ctx->userDataDdtHeader.entries, sizeof(uint32_t)); // All entries to zero
// Set the primary DDT offset (just after the header, block aligned)
ctx->primaryDdtOffset = sizeof(AaruHeaderV2); // Start just after the header
uint64_t alignmentMask = (1ULL << ctx->userDataDdtHeader.blockAlignmentShift) - 1;
ctx->primaryDdtOffset = (ctx->primaryDdtOffset + alignmentMask) & ~alignmentMask;
TRACE("Primary DDT will be placed at offset %" PRIu64, ctx->primaryDdtOffset);
// Calculate size of primary DDT table
uint64_t primaryTableSize = ctx->userDataDdtHeader.sizeType == SmallDdtSizeType
? ctx->userDataDdtHeader.entries * sizeof(uint16_t)
: ctx->userDataDdtHeader.entries * sizeof(uint32_t);
// Calculate where data blocks can start (after primary DDT + header)
uint64_t dataStartPosition = ctx->primaryDdtOffset + sizeof(DdtHeader2) + primaryTableSize;
ctx->nextBlockPosition = (dataStartPosition + alignmentMask) & ~alignmentMask;
TRACE("Data blocks will start at position %" PRIu64, ctx->nextBlockPosition);
// Position file pointer at the data start position
if(fseek(ctx->imageStream, (long)ctx->nextBlockPosition, SEEK_SET) != 0)
{
FATAL("Could not seek to data start position");
free(ctx->readableSectorTags);
if(ctx->userDataDdtMini) free(ctx->userDataDdtMini);
if(ctx->userDataDdtBig) free(ctx->userDataDdtBig);
utarray_free(ctx->indexEntries);
free(ctx);
errno = AARUF_ERROR_CANNOT_CREATE_FILE;
return NULL;
}
// Initialize index entries array
TRACE("Initializing index entries array");
UT_icd index_entry_icd = {sizeof(IndexEntry), NULL, NULL, NULL};