aaru-dps/libaaruformat
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Add support for resuming images.

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This commit is contained in:
Natalia Portillo
2025-10-21 14:02:47 +01:00
parent f0f364fd0e
commit f7da1e27bd
2 changed files with 52 additions and 3 deletions
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2
include/aaruformat/decls.h
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@@ -67,7 +67,7 @@ AARU_EXPORT int AARU_CALL aaruf_identify(const char *filename);
AARU_EXPORT int AARU_CALL aaruf_identify_stream(FILE *image_stream);
AARU_EXPORT void *AARU_CALL aaruf_open(const char *filepath);
AARU_EXPORT void *AARU_CALL aaruf_open(const char *filepath, bool resume_mode, char *options);
AARU_EXPORT void *AARU_CALL aaruf_create(const char *filepath, uint32_t media_type, uint32_t sector_size,
uint64_t user_sectors, uint64_t negative_sectors, uint64_t overflow_sectors,

53
src/open.c
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@@ -122,7 +122,8 @@ static void cleanup_open_failure(aaruformat_context *ctx)
* @warning Some memory allocations (version strings) are optional and failure doesn't
* prevent opening, but may affect functionality that depends on version information.
*/
AARU_EXPORT void AARU_CALL *aaruf_open(const char *filepath) // NOLINT(readability-function-size)
AARU_EXPORT void AARU_CALL *aaruf_open(const char *filepath, const bool resume_mode,
const char *options) // NOLINT(readability-function-size)
{
aaruformat_context *ctx = NULL;
int error_no = 0;
@@ -157,7 +158,10 @@ AARU_EXPORT void AARU_CALL *aaruf_open(const char *filepath) // NOLINT(readabil
memset(ctx, 0, sizeof(aaruformat_context));
TRACE("Opening file %s", filepath);
ctx->imageStream = fopen(filepath, "rb");
if(resume_mode)
ctx->imageStream = fopen(filepath, "a+b");
else
ctx->imageStream = fopen(filepath, "rb");
if(ctx->imageStream == NULL)
{
@@ -488,6 +492,51 @@ AARU_EXPORT void AARU_CALL *aaruf_open(const char *filepath) // NOLINT(readabil
ctx->library_major_version = LIBAARUFORMAT_MAJOR_VERSION;
ctx->library_minor_version = LIBAARUFORMAT_MINOR_VERSION;
if(!resume_mode)
{
TRACE("Exiting aaruf_open() = %p", ctx);
return ctx;
}
// Parse the options
TRACE("Parsing options");
const aaru_options parsed_options = parse_options(options);
ctx->header.lastWrittenTime = get_filetime_uint64();
ctx->image_info.LastModificationTime = ctx->header.lastWrittenTime;
// Calculate aligned next block position
fseek(ctx->imageStream, 0, SEEK_END);
const uint64_t alignment_mask = (1ULL << ctx->user_data_ddt_header.blockAlignmentShift) - 1;
ctx->next_block_position = ftell(ctx->imageStream); // Start just after the header
ctx->next_block_position = ctx->next_block_position + alignment_mask & ~alignment_mask;
TRACE("Data blocks will start at position %" PRIu64, ctx->next_block_position);
// Position file pointer at the data start position
if(fseek(ctx->imageStream, ctx->next_block_position, SEEK_SET) != 0)
{
FATAL("Could not seek to data start position");
errno = AARUF_ERROR_CANNOT_CREATE_FILE;
TRACE("Exiting aaruf_open() = NULL");
cleanup_open_failure(ctx);
return NULL;
}
// Apply applicable options (we cannot change table or alignment options resuming)
ctx->compression_enabled = parsed_options.compress;
ctx->lzma_dict_size = parsed_options.dictionary;
ctx->deduplicate = parsed_options.deduplicate;
if(ctx->deduplicate)
ctx->sector_hash_map = create_map(ctx->user_data_ddt_header.blocks * 25 / 100); // 25% of total sectors
// Cannot checksum a resumed file
ctx->rewinded = true;
// Is writing
ctx->is_writing = true;
TRACE("Exiting aaruf_open() = %p", ctx);
// Return context
return ctx;
}