rename getUint32 to getInt32 and collect readInt*() in util.js

src/core/chunked_stream.js

@@ -148,7 +148,7 @@ var ChunkedStream = (function ChunkedStreamClosure() {
       return (b0 << 8) + b1;
     },
 
-    getUint32: function ChunkedStream_getUint32() {
+    getInt32: function ChunkedStream_getInt32() {
       var b0 = this.getByte();
       var b1 = this.getByte();
       var b2 = this.getByte();

src/core/fonts.js

@@ -2864,9 +2864,9 @@ var Font = (function FontClosure() {
       function readTableEntry(file) {
         var tag = bytesToString(file.getBytes(4));
 
-        var checksum = file.getUint32();
-        var offset = file.getUint32();
-        var length = file.getUint32();
+        var checksum = file.getInt32();
+        var offset = file.getInt32() >>> 0;
+        var length = file.getInt32() >>> 0;
 
         // Read the table associated data
         var previousPosition = file.pos;
@@ -2923,7 +2923,7 @@ var Font = (function FontClosure() {
         for (var i = 0; i < numTables; i++) {
           var platformId = font.getUint16();
           var encodingId = font.getUint16();
-          var offset = font.getUint32();
+          var offset = font.getInt32() >>> 0;
           var useTable = false;
 
           if (platformId == 1 && encodingId === 0) {
@@ -3333,7 +3333,7 @@ var Font = (function FontClosure() {
         font.pos = start;
 
         var length = post.length, end = start + length;
-        var version = font.getUint32();
+        var version = font.getInt32();
         // skip rest to the tables
         font.getBytes(28);
 
@@ -3739,7 +3739,7 @@ var Font = (function FontClosure() {
       }
 
       font.pos = (font.start || 0) + tables.maxp.offset;
-      var version = font.getUint32();
+      var version = font.getInt32();
       var numGlyphs = font.getUint16();
       var maxFunctionDefs = 0;
       if (version >= 0x00010000 && tables.maxp.length >= 22) {

src/core/jbig2.js

@@ -14,7 +14,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-/* globals ArithmeticDecoder, error, shadow */
+/* globals ArithmeticDecoder, error, log2, readInt8, readUint16, readUint32,
+           shadow */
 
 'use strict';
 
@@ -188,33 +189,6 @@ var Jbig2Image = (function Jbig2ImageClosure() {
     0x0008  // '0000' + '001000'
   ];
 
-  function log2(x) {
-    var n = 1, i = 0;
-    while (x > n) {
-      n <<= 1;
-      i++;
-    }
-    return i;
-  }
-
-  function readInt32(data, start) {
-    return (data[start] << 24) | (data[start + 1] << 16) |
-           (data[start + 2] << 8) | data[start + 3];
-  }
-
-  function readUint32(data, start) {
-    var value = readInt32(data, start);
-    return value & 0x80000000 ? (value + 4294967296) : value;
-  }
-
-  function readUint16(data, start) {
-    return (data[start] << 8) | data[start + 1];
-  }
-
-  function readInt8(data, start) {
-    return (data[start] << 24) >> 24;
-  }
-
   // 6.2 Generic Region Decoding Procedure
   function decodeBitmap(mmr, width, height, templateIndex, prediction, skip, at,
                         decodingContext) {
@@ -645,7 +619,7 @@ var Jbig2Image = (function Jbig2ImageClosure() {
     var retainBits = [referredFlags & 31];
     var position = start + 6;
     if (referredFlags == 7) {
-      referredToCount = readInt32(data, position - 1) & 0x1FFFFFFF;
+      referredToCount = readUint32(data, position - 1) & 0x1FFFFFFF;
       position += 3;
       var bytes = (referredToCount + 7) >> 3;
       retainBits[0] = data[position++];

src/core/jpx.js

@@ -14,7 +14,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-/* globals ArithmeticDecoder, error, globalScope, warn */
+/* globals ArithmeticDecoder, error, globalScope, log2, readUint16, readUint32,
+           warn */
 
 'use strict';
 
@@ -45,15 +46,8 @@ var JpxImage = (function JpxImageClosure() {
       xhr.send(null);
     },
     parse: function JpxImage_parse(data) {
-      function readUint(data, offset, bytes) {
-        var n = 0;
-        for (var i = 0; i < bytes; i++) {
-          n = n * 256 + (data[offset + i] & 0xFF);
-        }
-        return n;
-      }
 
-      var head = readUint(data, 0, 2);
+      var head = readUint16(data, 0);
       // No box header, immediate start of codestream (SOC)
       if (head === 0xFF4F) {
         this.parseCodestream(data, 0, data.length);
@@ -63,11 +57,14 @@ var JpxImage = (function JpxImageClosure() {
       var position = 0, length = data.length;
       while (position < length) {
         var headerSize = 8;
-        var lbox = readUint(data, position, 4);
-        var tbox = readUint(data, position + 4, 4);
+        var lbox = readUint32(data, position);
+        var tbox = readUint32(data, position + 4);
         position += headerSize;
-        if (lbox == 1) {
-          lbox = readUint(data, position, 8);
+        if (lbox === 1) {
+          // XLBox: read UInt64 according to spec.
+          // JavaScript's int precision of 53 bit should be sufficient here.
+          lbox = readUint32(data, position) * 4294967296 +
+                 readUint32(data, position + 4);
           position += 8;
           headerSize += 8;
         }
@@ -108,16 +105,16 @@ var JpxImage = (function JpxImageClosure() {
           // Image and tile size (SIZ)
           if (code == 0xFF51) {
             stream.skip(4);
-            var Xsiz = stream.getUint32(); // Byte 4
-            var Ysiz = stream.getUint32(); // Byte 8
-            var XOsiz = stream.getUint32(); // Byte 12
-            var YOsiz = stream.getUint32(); // Byte 16
+            var Xsiz = stream.getInt32() >>> 0; // Byte 4
+            var Ysiz = stream.getInt32() >>> 0; // Byte 8
+            var XOsiz = stream.getInt32() >>> 0; // Byte 12
+            var YOsiz = stream.getInt32() >>> 0; // Byte 16
             stream.skip(16);
             var Csiz = stream.getUint16(); // Byte 36
             this.width = Xsiz - XOsiz;
             this.height = Ysiz - YOsiz;
             this.componentsCount = Csiz;
-            // Results are always returned as UInt8Arrays
+            // Results are always returned as Uint8Arrays
             this.bitsPerComponent = 8;
             return;
           }
@@ -379,21 +376,6 @@ var JpxImage = (function JpxImageClosure() {
       this.componentsCount = context.SIZ.Csiz;
     }
   };
-  function readUint32(data, offset) {
-    return (data[offset] << 24) | (data[offset + 1] << 16) |
-            (data[offset + 2] << 8) | data[offset + 3];
-  }
-  function readUint16(data, offset) {
-    return (data[offset] << 8) | data[offset + 1];
-  }
-  function log2(x) {
-    var n = 1, i = 0;
-    while (x > n) {
-      n <<= 1;
-      i++;
-    }
-    return i;
-  }
   function calculateComponentDimensions(component, siz) {
     // Section B.2 Component mapping
     component.x0 = Math.ceil(siz.XOsiz / component.XRsiz);

src/core/stream.js

@@ -46,7 +46,7 @@ var Stream = (function StreamClosure() {
       var b1 = this.getByte();
       return (b0 << 8) + b1;
     },
-    getUint32: function Stream_getUint32() {
+    getInt32: function Stream_getInt32() {
       var b0 = this.getByte();
       var b1 = this.getByte();
       var b2 = this.getByte();
@@ -164,7 +164,7 @@ var DecodeStream = (function DecodeStreamClosure() {
       var b1 = this.getByte();
       return (b0 << 8) + b1;
     },
-    getUint32: function DecodeStream_getUint32() {
+    getInt32: function DecodeStream_getInt32() {
       var b0 = this.getByte();
       var b1 = this.getByte();
       var b2 = this.getByte();

src/shared/util.js

@@ -423,6 +423,28 @@ function string32(value) {
                              (value >> 8) & 0xff, value & 0xff);
 }
 
+function log2(x) {
+  var n = 1, i = 0;
+  while (x > n) {
+    n <<= 1;
+    i++;
+  }
+  return i;
+}
+
+function readInt8(data, start) {
+  return (data[start] << 24) >> 24;
+}
+
+function readUint16(data, offset) {
+  return (data[offset] << 8) | data[offset + 1];
+}
+
+function readUint32(data, offset) {
+  return ((data[offset] << 24) | (data[offset + 1] << 16) |
+         (data[offset + 2] << 8) | data[offset + 3]) >>> 0;
+}
+
 // Lazy test the endianness of the platform
 // NOTE: This will be 'true' for simulated TypedArrays
 function isLittleEndian() {