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Add checksum writing functionality to close.c

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This commit is contained in:
Natalia Portillo
2025-10-02 23:59:10 +01:00
parent 8f6c600c32
commit ba853e23b6
1 changed files with 91 additions and 2 deletions
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93
src/close.c
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@@ -497,16 +497,105 @@ int aaruf_close(void *context)
TRACE("Failed to write single-level DDT table data to file");
}
uint64_t alignment_mask;
uint64_t aligned_position;
// Write the checksums block
bool has_checksums =
ctx->checksums.hasMd5 || ctx->checksums.hasSha1 || ctx->checksums.hasSha256 || ctx->checksums.hasSpamSum;
if(has_checksums)
{
ChecksumHeader checksum_header = {0};
checksum_header.identifier = ChecksumBlock;
fseek(ctx->imageStream, 0, SEEK_END);
long checksum_position = ftell(ctx->imageStream);
// Align index position to block boundary if needed
alignment_mask = (1ULL << ctx->userDataDdtHeader.blockAlignmentShift) - 1;
if(checksum_position & alignment_mask)
{
aligned_position = checksum_position + alignment_mask & ~alignment_mask;
fseek(ctx->imageStream, aligned_position, SEEK_SET);
checksum_position = aligned_position;
}
// Skip checksum_header
fseek(ctx->imageStream, sizeof(checksum_header), SEEK_CUR);
if(ctx->checksums.hasMd5)
{
TRACE("Writing MD5 checksum entry");
ChecksumEntry md5_entry = {0};
md5_entry.length = MD5_DIGEST_LENGTH;
md5_entry.type = Md5;
fwrite(&md5_entry, sizeof(ChecksumEntry), 1, ctx->imageStream);
fwrite(&ctx->checksums.md5, MD5_DIGEST_LENGTH, 1, ctx->imageStream);
checksum_header.length += sizeof(ChecksumEntry) + MD5_DIGEST_LENGTH;
checksum_header.entries++;
}
if(ctx->checksums.hasSha1)
{
TRACE("Writing SHA1 checksum entry");
ChecksumEntry sha1_entry = {0};
sha1_entry.length = SHA1_DIGEST_LENGTH;
sha1_entry.type = Sha1;
fwrite(&sha1_entry, sizeof(ChecksumEntry), 1, ctx->imageStream);
fwrite(&ctx->checksums.sha1, SHA1_DIGEST_LENGTH, 1, ctx->imageStream);
checksum_header.length += sizeof(ChecksumEntry) + SHA1_DIGEST_LENGTH;
checksum_header.entries++;
}
if(ctx->checksums.hasSha256)
{
TRACE("Writing SHA256 checksum entry");
ChecksumEntry sha256_entry = {0};
sha256_entry.length = SHA256_DIGEST_LENGTH;
sha256_entry.type = Sha256;
fwrite(&sha256_entry, sizeof(ChecksumEntry), 1, ctx->imageStream);
fwrite(&ctx->checksums.sha256, SHA256_DIGEST_LENGTH, 1, ctx->imageStream);
checksum_header.length += sizeof(ChecksumEntry) + SHA1_DIGEST_LENGTH;
checksum_header.entries++;
}
if(ctx->checksums.hasSpamSum)
{
TRACE("Writing SpamSum checksum entry");
ChecksumEntry spamsum_entry = {0};
spamsum_entry.length = strlen((const char *)ctx->checksums.spamsum);
spamsum_entry.type = SpamSum;
fwrite(&spamsum_entry, sizeof(ChecksumEntry), 1, ctx->imageStream);
fwrite(&ctx->checksums.spamsum, spamsum_entry.length, 1, ctx->imageStream);
checksum_header.length += sizeof(ChecksumEntry) + spamsum_entry.length;
checksum_header.entries++;
}
fseek(ctx->imageStream, checksum_position, SEEK_SET);
TRACE("Writing checksum header");
fwrite(&checksum_header, sizeof(ChecksumHeader), 1, ctx->imageStream);
// Add checksum block to index
TRACE("Adding checksum block to index");
IndexEntry checksum_index_entry;
checksum_index_entry.blockType = ChecksumBlock;
checksum_index_entry.dataType = 0;
checksum_index_entry.offset = checksum_position;
utarray_push_back(ctx->indexEntries, &checksum_index_entry);
TRACE("Added checksum block index entry at offset %" PRIu64, checksum_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);
long index_position = ftell(ctx->imageStream);
// Align index position to block boundary if needed
uint64_t alignment_mask = (1ULL << ctx->userDataDdtHeader.blockAlignmentShift) - 1;
alignment_mask = (1ULL << ctx->userDataDdtHeader.blockAlignmentShift) - 1;
if(index_position & alignment_mask)
{
uint64_t aligned_position = index_position + alignment_mask & ~alignment_mask;
aligned_position = index_position + alignment_mask & ~alignment_mask;
fseek(ctx->imageStream, aligned_position, SEEK_SET);
index_position = aligned_position;
TRACE("Aligned index position to %" PRIu64, aligned_position);