Wuffs' standard library consists of multiple packages, each implementing a particular file format or algorithm. Those packages can be grouped into several categories:
The general pattern is that a package foo (e.g. jpeg, png) contains a
struct bar (e.g. hasher, decoder, etc) that implements a
package-independent interface. For example, every compression decoder struct
would have a transform_io method. In C, this would be invoked as
// Allocate and initialize the struct.
wuffs_foo__decoder* dec = etc;
// Do the work. Error checking is not shown, for brevity.
wuffs_base__status status = wuffs_foo__decoder__transform_io(dec, etc);
When that C library is used as C++, that last line can be shortened:
wuffs_base__status status = dec->transform_io(etc);
See also the glossary, as well as the notes on:
By default, building Wuffs' standard library builds the entire thing (provided
that you've defined the WUFFS_IMPLEMENTATION C macro), implementing a variety
of codecs and file formats.
Packages can be individually allow-listed, for smaller binaries and faster
compiles. Opt in by also defining WUFFS_CONFIG__MODULES and then also
WUFFS_CONFIG__MODULE__ETC for each ETC (and its dependencies, listed below)
to enable.
ADLER32: BASEBMP: BASEBZIP2: BASECBOR: BASECRC32: BASECRC64: BASEDEFLATE: BASEETC2: BASEGIF: BASEGZIP: BASE, CRC32, DEFLATEHANDSUM: BASEJPEG: BASEJSON: BASELZIP: BASE, CRC32, LZMALZMA: BASELZW: BASENETPBM: BASENIE: BASEPNG: BASE, ADLER32, CRC32, DEFLATE, ZLIBQOI: BASESHA256: BASETGA: BASETHUMBHASH: BASEVP8: BASEWBMP: BASEWEBP: BASE, VP8XXHASH32: BASEXXHASH64: BASEXZ: BASE, CRC32, CRC64, LZMA, SHA256ZLIB: BASE, ADLER32, DEFLATE
For the auxiliary modules:
AUX_CBOR: AUX_BASE, BASE, CBORAUX_IMAGE: AUX_BASE, BASEand whichever image-related modules (and their dependencies) you want, e.g.GIF,PNG, etc.AUX_JSON: AUX_BASE, BASE, JSON