Revert 182402

chrome/browser/resources/file_manager/js/metadata/byte_reader.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 function ByteReader(arrayBuffer, opt_offset, opt_length) {
   opt_offset = opt_offset || 0;
   opt_length = opt_length || (arrayBuffer.byteLength - opt_offset);
   this.view_ = new DataView(arrayBuffer, opt_offset, opt_length);
   this.pos_ = 0;
   this.seekStack_ = [];
@@ skipping 31 matching lines @@
  * Seek relative to the end of the buffer.
  * @const
  * @type {number}
  */
 ByteReader.SEEK_END = 2;
 
 /**
  * Throw an error if (0 > pos >= end) or if (pos + size > end).
  *
  * Static utility function.
- *
- * @param {number} pos  //TODO(JSDOC).
- * @param {number} size  //TODO(JSDOC).
- * @param {number} end  //TODO(JSDOC).
  */
 ByteReader.validateRead = function(pos, size, end) {
   if (pos < 0 || pos >= end)
     throw new Error('Invalid read position');
 
   if (pos + size > end)
     throw new Error('Read past end of buffer');
 };
 
 /**
  * Read as a sequence of characters, returning them as a single string.
  *
  * This is a static utility function.  There is a member function with the
  * same name which side-effects the current read position.
- *
- * @param {DataView} dataView  //TODO(JSDOC).
- * @param {number} pos  //TODO(JSDOC).
- * @param {number} size  //TODO(JSDOC).
- * @param {number=} opt_end  //TODO(JSDOC).
  * @return {string}  //TODO(JSDOC).
  */
 ByteReader.readString = function(dataView, pos, size, opt_end) {
   ByteReader.validateRead(pos, size, opt_end || dataView.byteLength);
 
   var codes = [];
 
   for (var i = 0; i < size; ++i)
     codes.push(dataView.getUint8(pos + i));
 
   return String.fromCharCode.apply(null, codes);
 };
 
 /**
  * Read as a sequence of characters, returning them as a single string.
  *
  * This is a static utility function.  There is a member function with the
  * same name which side-effects the current read position.
- *
- * @param {DataView} dataView  //TODO(JSDOC).
- * @param {number} pos  //TODO(JSDOC).
- * @param {number} size  //TODO(JSDOC).
- * @param {number=} opt_end  //TODO(JSDOC).
  * @return {string}  //TODO(JSDOC).
  */
 ByteReader.readNullTerminatedString = function(dataView, pos, size, opt_end) {
   ByteReader.validateRead(pos, size, opt_end || dataView.byteLength);
 
   var codes = [];
 
   for (var i = 0; i < size; ++i) {
     var code = dataView.getUint8(pos + i);
     if (code == 0) break;
     codes.push(code);
   }
 
   return String.fromCharCode.apply(null, codes);
 };
 
 /**
  * Read as a sequence of UTF16 characters, returning them as a single string.
  *
  * This is a static utility function.  There is a member function with the
  * same name which side-effects the current read position.
- *
- * @param {DataView} dataView  //TODO(JSDOC).
- * @param {number} pos  //TODO(JSDOC).
- * @param {boolean} bom  //TODO(JSDOC).
- * @param {number} size  //TODO(JSDOC).
- * @param {number=} opt_end  //TODO(JSDOC).
  * @return {string}  //TODO(JSDOC).
  */
 ByteReader.readNullTerminatedStringUTF16 = function(
     dataView, pos, bom, size, opt_end) {
   ByteReader.validateRead(pos, size, opt_end || dataView.byteLength);
 
   var littleEndian = false;
   var start = 0;
 
   if (bom) {
@@ skipping 20 matching lines @@
 ByteReader.base64Alphabet_ =
     ('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/').
     split('');
 
 /**
  * Read as a sequence of bytes, returning them as a single base64 encoded
  * string.
  *
  * This is a static utility function.  There is a member function with the
  * same name which side-effects the current read position.
- *
- * @param {DataView} dataView  //TODO(JSDOC).
- * @param {number} pos  //TODO(JSDOC).
- * @param {number} size  //TODO(JSDOC).
- * @param {number=} opt_end  //TODO(JSDOC).
  * @return {string}  //TODO(JSDOC).
  */
 ByteReader.readBase64 = function(dataView, pos, size, opt_end) {
   ByteReader.validateRead(pos, size, opt_end || dataView.byteLength);
 
   var rv = [];
   var chars = [];
   var padding = 0;
 
   for (var i = 0; i < size; /* incremented inside */) {
@@ skipping 25 matching lines @@
     rv[rv.length - 2] = '=';
 
   return rv.join('');
 };
 
 /**
  * Read as an image encoded in a data url.
  *
  * This is a static utility function.  There is a member function with the
  * same name which side-effects the current read position.
- *
- * @param {DataView} dataView  //TODO(JSDOC).
- * @param {number} pos  //TODO(JSDOC).
- * @param {number} size  //TODO(JSDOC).
- * @param {number=} opt_end  //TODO(JSDOC).
  * @return {string}  //TODO(JSDOC).
  */
 ByteReader.readImage = function(dataView, pos, size, opt_end) {
   opt_end = opt_end || dataView.byteLength;
   ByteReader.validateRead(pos, size, opt_end);
 
   // Two bytes is enough to identify the mime type.
   var prefixToMime = {
      '\x89P' : 'png',
      '\xFF\xD8' : 'jpeg',
      'BM' : 'bmp',
      'GI' : 'gif'
   };
 
   var prefix = ByteReader.readString(dataView, pos, 2, opt_end);
   var mime = prefixToMime[prefix] ||
       dataView.getUint16(pos, false).toString(16);  // For debugging.
 
   var b64 = ByteReader.readBase64(dataView, pos, size, opt_end);
   return 'data:image/' + mime + ';base64,' + b64;
 };
 
 // Instance methods.
 
 /**
  * Return true if the requested number of bytes can be read from the buffer.
- *
- * @param {number} size  //TODO(JSDOC).
  * @return {boolean}  //TODO(JSDOC).
  */
 ByteReader.prototype.canRead = function(size) {
    return this.pos_ + size <= this.view_.byteLength;
 };
 
 /**
  * Return true if the current position is past the end of the buffer.
  * @return {boolean}  //TODO(JSDOC).
  */
@@ skipping 12 matching lines @@
 /**
  * Return true if the current position is outside the buffer.
  * @return {boolean}  //TODO(JSDOC).
  */
 ByteReader.prototype.beof = function() {
   return this.pos_ >= this.view_.byteLength || this.pos_ < 0;
 };
 
 /**
  * Set the expected byte ordering for future reads.
- * @param {number} order  //TODO(JSDOC).
  */
 ByteReader.prototype.setByteOrder = function(order) {
   this.littleEndian_ = order == ByteReader.LITTLE_ENDIAN;
 };
 
 /**
  * Throw an error if the reader is at an invalid position, or if a read a read
  * of |size| would put it in one.
  *
  * You may optionally pass opt_end to override what is considered to be the
  * end of the buffer.
- *
- * @param {number} size  //TODO(JSDOC).
- * @param {number=} opt_end  //TODO(JSDOC).
  */
 ByteReader.prototype.validateRead = function(size, opt_end) {
   if (typeof opt_end == 'undefined')
     opt_end = this.view_.byteLength;
 
   ByteReader.validateRead(this.view_, this.pos_, size, opt_end);
 };
 
 /**
  * @param {number} width  //TODO(JSDOC).
@@ skipping 30 matching lines @@
   var rv = this.view_[method](this.pos_, this.littleEndian_);
   this.pos_ += width;
   return rv;
 };
 
 /**
  * Read as a sequence of characters, returning them as a single string.
  *
  * Adjusts the current position on success.  Throws an exception if the
  * read would go past the end of the buffer.
- *
- * @param {number} size  //TODO(JSDOC).
- * @param {number=} opt_end  //TODO(JSDOC).
  * @return {string}  //TODO(JSDOC).
  */
 ByteReader.prototype.readString = function(size, opt_end) {
   var rv = ByteReader.readString(this.view_, this.pos_, size, opt_end);
   this.pos_ += size;
   return rv;
 };
 
 
 /**
  * Read as a sequence of characters, returning them as a single string.
  *
  * Adjusts the current position on success.  Throws an exception if the
  * read would go past the end of the buffer.
- *
- * @param {number} size  //TODO(JSDOC).
- * @param {number=} opt_end  //TODO(JSDOC).
  * @return {string}  //TODO(JSDOC).
  */
 ByteReader.prototype.readNullTerminatedString = function(size, opt_end) {
   var rv = ByteReader.readNullTerminatedString(this.view_,
                                                this.pos_,
                                                size,
                                                opt_end);
   this.pos_ += rv.length;
 
   if (rv.length < size) {
     // If we've stopped reading because we found '0' but didn't hit size limit
     // then we should skip additional '0' character
     this.pos_++;
   }
 
   return rv;
 };
 
 
 /**
  * Read as a sequence of UTF16 characters, returning them as a single string.
  *
  * Adjusts the current position on success.  Throws an exception if the
  * read would go past the end of the buffer.
- *
- * @param {boolean} bom  //TODO(JSDOC).
- * @param {number} size  //TODO(JSDOC).
- * @param {number=} opt_end  //TODO(JSDOC).
  * @return {string}  //TODO(JSDOC).
  */
 ByteReader.prototype.readNullTerminatedStringUTF16 =
     function(bom, size, opt_end) {
   var rv = ByteReader.readNullTerminatedStringUTF16(
       this.view_, this.pos_, bom, size, opt_end);
 
   if (bom) {
     // If the BOM word was present advance the position.
     this.pos_ += 2;
   }
 
   this.pos_ += rv.length;
 
   if (rv.length < size) {
     // If we've stopped reading because we found '0' but didn't hit size limit
     // then we should skip additional '0' character
     this.pos_ += 2;
   }
 
   return rv;
 };
 
 
 /**
  * Read as an array of numbers.
  *
  * Adjusts the current position on success.  Throws an exception if the
  * read would go past the end of the buffer.
- *
- * @param {number} size  //TODO(JSDOC).
- * @param {number=} opt_end  //TODO(JSDOC).
- * @param {function(new:Array.<*>)=} opt_arrayConstructor  //TODO(JSDOC).
  * @return {Array.<*>}  //TODO(JSDOC).
  */
 ByteReader.prototype.readSlice = function(size, opt_end,
                                           opt_arrayConstructor) {
   this.validateRead(size, opt_end);
 
   var arrayConstructor = opt_arrayConstructor || Uint8Array;
   var slice = new arrayConstructor(
       this.view_.buffer, this.view_.byteOffset + this.pos, size);
   this.pos_ += size;
 
   return slice;
 };
 
 /**
  * Read as a sequence of bytes, returning them as a single base64 encoded
  * string.
  *
  * Adjusts the current position on success.  Throws an exception if the
  * read would go past the end of the buffer.
- *
- * @param {number} size  //TODO(JSDOC).
- * @param {number=} opt_end  //TODO(JSDOC).
  * @return {string}  //TODO(JSDOC).
  */
 ByteReader.prototype.readBase64 = function(size, opt_end) {
   var rv = ByteReader.readBase64(this.view_, this.pos_, size, opt_end);
   this.pos_ += size;
   return rv;
 };
 
 /**
  * Read an image returning it as a data url.
  *
  * Adjusts the current position on success.  Throws an exception if the
  * read would go past the end of the buffer.
- *
- * @param {number} size  //TODO(JSDOC).
- * @param {number=} opt_end  //TODO(JSDOC).
  * @return {string}  //TODO(JSDOC).
  */
 ByteReader.prototype.readImage = function(size, opt_end) {
   var rv = ByteReader.readImage(this.view_, this.pos_, size, opt_end);
   this.pos_ += size;
   return rv;
 };
 
 /**
  * Seek to a give position relative to opt_seekStart.
- *
- * @param {number} pos  //TODO(JSDOC).
- * @param {number=} opt_seekStart  //TODO(JSDOC).
- * @param {number=} opt_end  //TODO(JSDOC).
  */
 ByteReader.prototype.seek = function(pos, opt_seekStart, opt_end) {
   opt_end = opt_end || this.view_.byteLength;
 
   var newPos;
   if (opt_seekStart == ByteReader.SEEK_CUR) {
     newPos = this.pos_ + pos;
   } else if (opt_seekStart == ByteReader.SEEK_END) {
     newPos = opt_end + pos;
   } else {
     newPos = pos;
   }
 
   if (newPos < 0 || newPos > this.view_.byteLength)
     throw new Error('Seek outside of buffer: ' + (newPos - opt_end));
 
   this.pos_ = newPos;
 };
 
 /**
  * Seek to a given position relative to opt_seekStart, saving the current
  * position.
  *
  * Recover the current position with a call to seekPop.
- *
- * @param {number} pos  //TODO(JSDOC).
- * @param {number=} opt_seekStart  //TODO(JSDOC).
  */
 ByteReader.prototype.pushSeek = function(pos, opt_seekStart) {
   var oldPos = this.pos_;
   this.seek(pos, opt_seekStart);
   // Alter the seekStack_ after the call to seek(), in case it throws.
   this.seekStack_.push(oldPos);
 };
 
 /**
  * Undo a previous seekPush.
  */
 ByteReader.prototype.popSeek = function() {
   this.seek(this.seekStack_.pop());
 };
 
 /**
  * Return the current read position.
  * @return {number}  //TODO(JSDOC).
  */
 ByteReader.prototype.tell = function() {
   return this.pos_;
 };