Handle edge cases during string measuring

.changeset/happy-terms-share.md

@@ -0,0 +1,5 @@
+---
+'@trustnxt/c2pa-ts': patch
+---
+
+Handle edge cases during string measuring

src/jumbf/DescriptionBox.ts

@@ -68,7 +68,7 @@ class DescriptionBoxSchema extends BoxSchema<DescriptionBox> {
         return measurer.add(
             this.uuid.measure(value.uuid).size +
                 1 + // toggles
-                (value.label ? value.label.length + 1 : 0) +
+                (value.label ? this.label.measure(value.label).size : 0) +
                 (value.id ? 4 : 0) +
                 (value.hash ? 32 : 0) +
                 value.privateBoxes.reduce((acc, box) => acc + box.schema.measure(box).size, 0),

src/jumbf/EmbeddedFileDescriptionBox.ts

@@ -32,7 +32,7 @@ class EmbeddedFileDescriptionBoxSchema extends BoxSchema<EmbeddedFileDescription
     measureContent(value: EmbeddedFileDescriptionBox, measurer: bin.IMeasurer): bin.IMeasurer {
         return measurer.add(
             1 + // flags
-                this.mediaType.measure(value.mediaType ?? '').size +
+                (value.mediaType ? this.mediaType.measure(value.mediaType).size : 0) +
                 (value.fileName ? this.fileName.measure(value.fileName).size : 0),
         );
     }