feat: Decouple asset_handlers into c2pa-codecs crate

Cargo.toml

@@ -1,3 +1,10 @@
 [workspace]
 resolver = "2"
-members = ["sdk", "export_schema", "make_test_images"]
+members = [
+  "sdk",
+  "export_schema",
+  "make_test_images",
+  "sdk/crates/*",
+  # TODO: add wildcard
+  "sdk/crates/c2pa-codecs/fuzz",
+]

sdk/crates/c2pa-codecs/Cargo.toml

@@ -0,0 +1,59 @@
+[package]
+name = "c2pa-codecs"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+thiserror = "1.0.61"
+# TODO: need?
+memchr = "2.7.1"
+# TODO: unneeded and super unmaintained
+conv = "0.3.3"
+# TODO: remove this
+tempfile = "3.10.1"
+byteorder = { version = "1.4.3", default-features = false }
+# TODO: do we need
+serde_bytes = { version = "0.11.5", optional = true }
+# TODO: temp
+serde = { version = "1.0.197", features = ["derive"] }
+# TODO: unmaintained
+atree = "0.5.2"
+# TODO: this crate is deprecated, use quick-xml
+fast-xml = { version = "0.23.1", optional = true }
+quick-xml = { version = "0.36.1", optional = true }
+lopdf = { version = "0.31.0", optional = true }
+# Version 1.13.0 doesn't compile under Rust < 1.75, pinning to 1.12.0
+id3 = { version = "=1.12.0", optional = true }
+png_pong = { version = "0.9.1", optional = true }
+# TODO: sort of unmaintained
+img-parts = { version = "0.3.0", optional = true }
+# TODO: sort of unmaintained
+riff = { version = "1.0.1", optional = true }
+# TODO: needed?
+base64 = { version = "0.21.2", optional = true }
+# TODO: look into
+jfifdump = { version = "0.5.1", optional = true }
+
+[features]
+default = [
+  "bmff",
+  "gif",
+  "jpeg",
+  "mp3",
+  "pdf",
+  "png",
+  "riff",
+  "svg",
+  "tiff",
+  "xmp",
+]
+xmp = ["fast-xml"]
+bmff = []
+gif = []
+jpeg = ["img-parts", "jfifdump"]
+mp3 = ["id3"]
+pdf = ["lopdf"]
+png = ["png_pong", "img-parts"] # TODO: remove img-parts feature here
+riff = ["dep:riff"]
+svg = ["fast-xml", "base64"]
+tiff = []

sdk/crates/c2pa-codecs/fuzz/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "c2pa-codecs-fuzz"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+afl = "0.15.10"
+c2pa-codecs = { path = ".." }

sdk/crates/c2pa-codecs/fuzz/src/main.rs

@@ -0,0 +1,25 @@
+use std::io::Cursor;
+
+use c2pa_codecs::{
+    codecs::{gif::GifCodec, svg::SvgCodec},
+    Decode,
+};
+
+// TODO: add all codecs and add way to choose what to fuzz, reading/writing/c2pa/xmp/etc.
+fn main() {
+    afl::fuzz!(|data: &[u8]| {
+        let src = Cursor::new(data);
+
+        // let mut c = GifCodec::new(src);
+        // let _ = c.read_c2pa();
+        // let _ = c.read_xmp();
+
+        let mut c = SvgCodec::new(src);
+        let _ = c.read_c2pa();
+        let _ = c.read_xmp();
+
+        // let mut c = C2paCodec::new(src);
+        // let _ = c.read_c2pa();
+        // let _ = c.read_xmp();
+    });
+}