Skip to content

Added support for decmpfs raw compression (9 and 10) #88

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
joachimmetz merged 4 commits into from
Aug 2, 2026
Merged

Added support for decmpfs raw compression (9 and 10) #88

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
3bfd4e9
Add support for decmpfs compression types 9 and 10 (stored/uncompressed)
ecc521 Jun 24, 2026
6545266
tests: add STORED (types 9/10) test cases
ecc521 Jun 24, 2026
1d2dd79
Changes after review
joachimmetz Aug 2, 2026
6ddbefa
Changes after review
joachimmetz Aug 2, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
4 changes: 3 additions & 1 deletion libfsapfs/libfsapfs_compressed_data_handle.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -82,6 +82,7 @@ int libfsapfs_compressed_data_handle_initialize(
}
if( ( compression_method != LIBFSAPFS_COMPRESSION_METHOD_DEFLATE )
&& ( compression_method != LIBFSAPFS_COMPRESSION_METHOD_LZVN )
&& ( compression_method != LIBFSAPFS_COMPRESSION_METHOD_RAW )
&& ( compression_method != LIBFSAPFS_COMPRESSION_METHOD_UNKNOWN5 ) )
{
libcerror_error_set(
Expand Down Expand Up @@ -459,7 +460,8 @@ int libfsapfs_compressed_data_handle_get_compressed_block_offsets(
compressed_descriptors_offset += 4;
compressed_block_descriptor_size = 8;
}
else if( data_handle->compression_method == LIBFSAPFS_COMPRESSION_METHOD_LZVN )
else if( ( data_handle->compression_method == LIBFSAPFS_COMPRESSION_METHOD_LZVN )
|| ( data_handle->compression_method == LIBFSAPFS_COMPRESSION_METHOD_RAW ) )
{
segment_data_offset = 0;

Expand Down
69 changes: 67 additions & 2 deletions libfsapfs/libfsapfs_compression.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -149,7 +149,7 @@ int libfsapfs_decompress_data(
error,
LIBCERROR_ERROR_DOMAIN_MEMORY,
LIBCERROR_MEMORY_ERROR_COPY_FAILED,
"%s: unable to compressed to uncompressed data.",
"%s: unable to copy compressed to uncompressed data.",
function );

return( -1 );
Expand Down Expand Up @@ -274,6 +274,71 @@ int libfsapfs_decompress_data(
#endif /* ( defined( HAVE_ZLIB ) && defined( HAVE_ZLIB_UNCOMPRESS ) ) || defined( ZLIB_DLL ) */
}
}
else if( compression_method == LIBFSAPFS_COMPRESSION_METHOD_RAW )
{
if( ( compressed_data_size < 1 )
|| ( compressed_data[ 0 ] != 0xcc ) )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_UNSUPPORTED_VALUE,
"%s: invalid raw compressed data - unsupported marker byte.",
function );

return( -1 );
}
if( compressed_data_size > (size_t) SSIZE_MAX )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,
"%s: invalid compressed data size value exceeds maximum.",
function );

return( -1 );
}
if( *uncompressed_data_size > (size_t) SSIZE_MAX )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,
"%s: invalid uncompressed data size value exceeds maximum.",
function );

return( -1 );
}
if( ( compressed_data_size - 1 ) > *uncompressed_data_size )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_VALUE_OUT_OF_BOUNDS,
"%s: compressed data size value exceeds uncompressed data size.",
function );

return( -1 );
}
*uncompressed_data_size = compressed_data_size - 1;

if( memory_copy(
uncompressed_data,
&( compressed_data[ 1 ] ),
*uncompressed_data_size ) == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_MEMORY,
LIBCERROR_MEMORY_ERROR_COPY_FAILED,
"%s: unable to copy compressed to uncompressed data.",
function );

return( -1 );
}
result = 1;
}
#ifdef TODO
/* TODO need sample data */
else if( compression_method == LIBFSAPFS_COMPRESSION_METHOD_LZFSE )
Expand Down Expand Up @@ -347,7 +412,7 @@ int libfsapfs_decompress_data(
error,
LIBCERROR_ERROR_DOMAIN_MEMORY,
LIBCERROR_MEMORY_ERROR_COPY_FAILED,
"%s: unable to compressed to uncompressed data.",
"%s: unable to copy compressed to uncompressed data.",
function );

return( -1 );
Expand Down
1 change: 1 addition & 0 deletions libfsapfs/libfsapfs_definitions.h.in
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -90,6 +90,7 @@ enum LIBFSAPFS_COMPRESSION_METHODS
LIBFSAPFS_COMPRESSION_METHOD_DEFLATE = 1,
LIBFSAPFS_COMPRESSION_METHOD_LZFSE = 2,
LIBFSAPFS_COMPRESSION_METHOD_LZVN = 3,
LIBFSAPFS_COMPRESSION_METHOD_RAW = 4,

LIBFSAPFS_COMPRESSION_METHOD_UNKNOWN5 = 5
};
Expand Down
8 changes: 7 additions & 1 deletion libfsapfs/libfsapfs_file_entry.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -4357,6 +4357,11 @@ int libfsapfs_internal_file_entry_get_data_stream(
compression_method = LIBFSAPFS_COMPRESSION_METHOD_LZVN;
break;

case 9:
case 10:
compression_method = LIBFSAPFS_COMPRESSION_METHOD_RAW;
break;

case 11:
case 12:
compression_method = LIBFSAPFS_COMPRESSION_METHOD_LZFSE;
Expand All @@ -4374,7 +4379,8 @@ int libfsapfs_internal_file_entry_get_data_stream(
goto on_error;
}
if( ( internal_file_entry->compressed_data_header->compression_method == 4 )
|| ( internal_file_entry->compressed_data_header->compression_method == 8 ) )
|| ( internal_file_entry->compressed_data_header->compression_method == 8 )
|| ( internal_file_entry->compressed_data_header->compression_method == 10 ) )
{
if( libfsapfs_attributes_get_data_stream(
internal_file_entry->resource_fork_attribute_values,
Expand Down
Loading
Loading