PNG packing (#3)

* Add PNG packing. * Fix PNG unparse error message.
blead · Aug 5, 2024 · ed4b97d · ed4b97d
1 parent 7f89b4b
commit ed4b97d
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Showing 2 changed files with 11 additions and 1 deletion.
diff --git a/pkg/wf/packer.go b/pkg/wf/packer.go
@@ -70,6 +70,7 @@ func NewPacker(config *PackerConfig) (*Packer, error) {
 	parsers := []parser{
 		// &amf3Parser{ext: ".action.dsl"},
 		// &esdlParser{&amf3Parser{ext: ".esdl"}},
+		&pngParser{},
 		&orderedmapParser{}, // needs to be last because of ambiguous file extension
 	}
 

diff --git a/pkg/wf/parser.go b/pkg/wf/parser.go
@@ -193,7 +193,16 @@ func (*pngParser) matchDest(dest string, config *PackerConfig) (string, bool) {
 }
 
 func (*pngParser) unparse(raw []byte, config *PackerConfig) ([]byte, error) {
-	return nil, fmt.Errorf("unparse pngParser: not implemented")
+	// P N G
+	if raw[1] != 0x50 || raw[2] != 0x4e || raw[3] != 0x47 {
+		return nil, fmt.Errorf("pngUnparser: png header mismatch, expected: 504e47, found: %x", hex.EncodeToString(raw[1:4]))
+	}
+
+	raw[1] = 0x70
+	raw[2] = 0x6e
+	raw[3] = 0x67
+
+	return raw, nil
 }
 
 type charPngParser struct {