1 files changed, 82 insertions, 0 deletions
diff --git a/vendor/codeberg.org/gruf/go-ffmpreg/wasm/run.go b/vendor/codeberg.org/gruf/go-ffmpreg/wasm/run.go
new file mode 100644
index 000000000..62ce2bc25
--- /dev/null
+++ b/vendor/codeberg.org/gruf/go-ffmpreg/wasm/run.go
@@ -0,0 +1,82 @@
+package wasm
+
+import (
+	"context"
+	"io"
+	"unsafe"
+
+	"github.com/tetratelabs/wazero"
+	"github.com/tetratelabs/wazero/sys"
+)
+
+// Args encompasses a common set of
+// configuration options often passed to
+// wazero.Runtime on module instantiation.
+type Args struct {
+
+	// Optional further module configuration function.
+	// (e.g. to mount filesystem dir, set env vars, etc).
+	Config func(wazero.ModuleConfig) wazero.ModuleConfig
+
+	// Standard FDs.
+	Stdin  io.Reader
+	Stdout io.Writer
+	Stderr io.Writer
+
+	// CLI args.
+	Args []string
+}
+
+// Run will run given compiled WebAssembly module
+// within the given runtime, with given arguments.
+// Returns the exit code, or error.
+func Run(
+	ctx context.Context,
+	runtime wazero.Runtime,
+	module wazero.CompiledModule,
+	args Args,
+) (rc uint32, err error) {
+
+	// Prefix arguments with module name.
+	cargs := make([]string, len(args.Args)+1)
+	cargs[0] = module.Name()
+	copy(cargs[1:], args.Args)
+
+	// Prepare new module configuration.
+	modcfg := wazero.NewModuleConfig()
+	modcfg = modcfg.WithArgs(cargs...)
+	modcfg = modcfg.WithStdin(args.Stdin)
+	modcfg = modcfg.WithStdout(args.Stdout)
+	modcfg = modcfg.WithStderr(args.Stderr)
+
+	if args.Config != nil {
+		// Pass through config fn.
+		modcfg = args.Config(modcfg)
+	}
+
+	// Enable setjmp longjmp.
+	ctx = withSetjmpLongjmp(ctx)
+
+	// Instantiate the module from precompiled wasm module data.
+	mod, err := runtime.InstantiateModule(ctx, module, modcfg)
+
+	if !isNil(mod) {
+		// Ensure closed.
+		_ = mod.Close(ctx)
+	}
+
+	// Try extract exit code.
+	switch err := err.(type) {
+	case *sys.ExitError:
+		return err.ExitCode(), nil
+	default:
+		return 0, err
+	}
+}
+
+// isNil will safely check if 'v' is nil without
+// dealing with weird Go interface nil bullshit.
+func isNil(i interface{}) bool {
+	type eface struct{ Type, Data unsafe.Pointer }
+	return (*(*eface)(unsafe.Pointer(&i))).Data == nil
+}