read first block of text

Author: netbymatt

src/headers/symbology.js

@@ -1,6 +1,10 @@
+const symbology6 = require('./symbology6');
+
 const parse = (raf) => {
 	const blockDivider = raf.readShort();
 	const blockId = raf.readShort();
+	// block id 6 is undocumented but appears to be text
+	if (blockId === 6) return symbology6(raf);
 	const blockLength = raf.readInt();
 
 	// test some known values

src/headers/symbology6.js

@@ -0,0 +1,24 @@
+// block id 6 is undocumented but appears to be text
+
+const parse = (raf) => {
+	const pages = [];
+
+	// loop until a -1 is encounted
+	let length = raf.readShort();
+	do {
+		while (length !== -1) {
+			pages.push(raf.readString(length));
+			length = raf.readShort();
+		}
+		length = raf.readShort();
+	} while (length === 80);
+
+	// roll back the 4 bytes used to detect the end of the text area
+	raf.skip(-4);
+
+	return { pages };
+};
+
+//
+
+module.exports = parse;