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change DataView to bit twiddling for JavaScript

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This commit is contained in:
Evan Wallace
2015-10-14 00:29:01 -07:00
parent 00fd394d23
commit c3bfefca57
1 changed files with 48 additions and 20 deletions
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68
js/flatbuffers.js
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@@ -31,6 +31,30 @@ flatbuffers.SIZEOF_INT = 4;
*/
flatbuffers.FILE_IDENTIFIER_LENGTH = 4;
/**
* @type {Int32Array}
* @const
*/
flatbuffers.int32 = new Int32Array(2);
/**
* @type {Float32Array}
* @const
*/
flatbuffers.float32 = new Float32Array(flatbuffers.int32.buffer);
/**
* @type {Float64Array}
* @const
*/
flatbuffers.float64 = new Float64Array(flatbuffers.int32.buffer);
/**
* @type {boolean}
* @const
*/
flatbuffers.isLittleEndian = new Uint16Array(new Uint8Array([1, 0]).buffer)[0] === 1;
////////////////////////////////////////////////////////////////////////////////
/**
@@ -706,12 +730,6 @@ flatbuffers.ByteBuffer = function(bytes) {
*/
this.bytes_ = bytes;
/**
* @type {DataView}
* @private
*/
this.view_ = new DataView(bytes.buffer, bytes.byteOffset, bytes.length);
/**
* @type {number}
* @private
@@ -760,7 +778,7 @@ flatbuffers.ByteBuffer.prototype.capacity = function() {
* @returns {number}
*/
flatbuffers.ByteBuffer.prototype.readInt8 = function(offset) {
return this.view_.getInt8(offset);
return this.readUint8(offset) << 24 >> 24;
};
/**
@@ -768,7 +786,7 @@ flatbuffers.ByteBuffer.prototype.readInt8 = function(offset) {
* @returns {number}
*/
flatbuffers.ByteBuffer.prototype.readUint8 = function(offset) {
return this.view_.getUint8(offset);
return this.bytes_[offset];
};
/**
@@ -776,7 +794,7 @@ flatbuffers.ByteBuffer.prototype.readUint8 = function(offset) {
* @returns {number}
*/
flatbuffers.ByteBuffer.prototype.readInt16 = function(offset) {
return this.view_.getInt16(offset, true);
return this.readUint16(offset) << 16 >> 16;
};
/**
@@ -784,7 +802,7 @@ flatbuffers.ByteBuffer.prototype.readInt16 = function(offset) {
* @returns {number}
*/
flatbuffers.ByteBuffer.prototype.readUint16 = function(offset) {
return this.view_.getUint16(offset, true);
return this.bytes_[offset] | this.bytes_[offset + 1] << 8;
};
/**
@@ -792,7 +810,7 @@ flatbuffers.ByteBuffer.prototype.readUint16 = function(offset) {
* @returns {number}
*/
flatbuffers.ByteBuffer.prototype.readInt32 = function(offset) {
return this.view_.getInt32(offset, true);
return this.bytes_[offset] | this.bytes_[offset + 1] << 8 | this.bytes_[offset + 2] << 16 | this.bytes_[offset + 3] << 24;
};
/**
@@ -800,7 +818,7 @@ flatbuffers.ByteBuffer.prototype.readInt32 = function(offset) {
* @returns {number}
*/
flatbuffers.ByteBuffer.prototype.readUint32 = function(offset) {
return this.view_.getUint32(offset, true);
return this.readInt32(offset) >>> 0;
};
/**
@@ -816,7 +834,7 @@ flatbuffers.ByteBuffer.prototype.readInt64 = function(offset) {
* @returns {flatbuffers.Long}
*/
flatbuffers.ByteBuffer.prototype.readUint64 = function(offset) {
return new flatbuffers.Long(this.readInt32(offset), this.readInt32(offset + 4));
return new flatbuffers.Long(this.readUint32(offset), this.readUint32(offset + 4));
};
/**
@@ -824,7 +842,8 @@ flatbuffers.ByteBuffer.prototype.readUint64 = function(offset) {
* @returns {number}
*/
flatbuffers.ByteBuffer.prototype.readFloat32 = function(offset) {
return this.view_.getFloat32(offset, true);
flatbuffers.int32[0] = this.readInt32(offset);
return flatbuffers.float32[0];
};
/**
@@ -832,7 +851,9 @@ flatbuffers.ByteBuffer.prototype.readFloat32 = function(offset) {
* @returns {number}
*/
flatbuffers.ByteBuffer.prototype.readFloat64 = function(offset) {
return this.view_.getFloat64(offset, true);
flatbuffers.int32[flatbuffers.isLittleEndian ? 0 : 1] = this.readInt32(offset);
flatbuffers.int32[flatbuffers.isLittleEndian ? 1 : 0] = this.readInt32(offset + 4);
return flatbuffers.float64[0];
};
/**
@@ -840,7 +861,7 @@ flatbuffers.ByteBuffer.prototype.readFloat64 = function(offset) {
* @param {number} value
*/
flatbuffers.ByteBuffer.prototype.writeInt8 = function(offset, value) {
this.view_.setInt8(offset, value);
this.bytes_[offset] = value;
};
/**
@@ -848,7 +869,8 @@ flatbuffers.ByteBuffer.prototype.writeInt8 = function(offset, value) {
* @param {number} value
*/
flatbuffers.ByteBuffer.prototype.writeInt16 = function(offset, value) {
this.view_.setInt16(offset, value, true);
this.bytes_[offset] = value;
this.bytes_[offset + 1] = value >> 8;
};
/**
@@ -856,7 +878,10 @@ flatbuffers.ByteBuffer.prototype.writeInt16 = function(offset, value) {
* @param {number} value
*/
flatbuffers.ByteBuffer.prototype.writeInt32 = function(offset, value) {
this.view_.setInt32(offset, value, true);
this.bytes_[offset] = value;
this.bytes_[offset + 1] = value >> 8;
this.bytes_[offset + 2] = value >> 16;
this.bytes_[offset + 3] = value >> 24;
};
/**
@@ -873,7 +898,8 @@ flatbuffers.ByteBuffer.prototype.writeInt64 = function(offset, value) {
* @param {number} value
*/
flatbuffers.ByteBuffer.prototype.writeFloat32 = function(offset, value) {
this.view_.setFloat32(offset, value, true);
flatbuffers.float32[0] = value;
this.writeInt32(offset, flatbuffers.int32[0]);
};
/**
@@ -881,7 +907,9 @@ flatbuffers.ByteBuffer.prototype.writeFloat32 = function(offset, value) {
* @param {number} value
*/
flatbuffers.ByteBuffer.prototype.writeFloat64 = function(offset, value) {
this.view_.setFloat64(offset, value, true);
flatbuffers.float64[0] = value;
this.writeInt32(offset, flatbuffers.int32[flatbuffers.isLittleEndian ? 0 : 1]);
this.writeInt32(offset + 4, flatbuffers.int32[flatbuffers.isLittleEndian ? 1 : 0]);
};
/**