From e61366b37fdb930a7283b59036e8e50afc150bb5 Mon Sep 17 00:00:00 2001
From: Mihai Bazon <mihai@bazon.net>
Date: Sat, 16 Aug 2014 11:50:52 +0300
Subject: [PATCH] Fix reading `cmap` table

The data offset must be saved before parsing one entry and restored
thereafter.  Otherwise only the first table is parsed properly, and garbage
is returned for the rest.  Fails on i.e. georgiai.ttf.

When reading the glyphIds, divide count by 2 (we read 16-bit words).
---
 lib/font/tables/cmap.coffee | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/font/tables/cmap.coffee b/lib/font/tables/cmap.coffee
index 00b8a53..7a66f72 100644
--- a/lib/font/tables/cmap.coffee
+++ b/lib/font/tables/cmap.coffee
@@ -32,6 +32,8 @@ class CmapEntry
     @platformID = data.readUInt16()
     @encodingID = data.readShort()
     @offset = offset + data.readInt()
+
+    saveOffset = data.pos
     
     data.pos = @offset
     @format = data.readUInt16()
@@ -58,7 +60,7 @@ class CmapEntry
         idDelta = (data.readUInt16() for i in [0...segCount])
         idRangeOffset = (data.readUInt16() for i in [0...segCount])
         
-        count = @length - data.pos + @offset
+        count = (@length - data.pos + @offset) / 2
         glyphIds = (data.readUInt16() for i in [0...count])
         
         for tail, i in endCode
@@ -72,6 +74,8 @@ class CmapEntry
               glyphId += idDelta[i] if glyphId isnt 0
               
             @codeMap[code] = glyphId & 0xFFFF
+
+    data.pos = saveOffset
             
   @encode: (charmap, encoding) ->
     subtable = new Data
@@ -186,4 +190,4 @@ class CmapEntry
           subtable: subtable.data
           maxGlyphID: nextID + 1
     
-module.exports = CmapTable
\ No newline at end of file
+module.exports = CmapTable