f8005a5d5a
This reverts commit f00e06c95b.
Although Node Buffers are not covered by the tests, it seems that there
are users relying on them, so we need to add back in support for them.
This fixes issue #4359.
991 lines
29 KiB
JavaScript
991 lines
29 KiB
JavaScript
// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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/**
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* @fileoverview This file contains helper code used by jspb.BinaryReader
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* and BinaryWriter.
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*
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* @author aappleby@google.com (Austin Appleby)
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*/
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goog.provide('jspb.utils');
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goog.require('goog.asserts');
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goog.require('goog.crypt');
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goog.require('goog.crypt.base64');
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goog.require('goog.string');
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goog.require('jspb.BinaryConstants');
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/**
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* Javascript can't natively handle 64-bit data types, so to manipulate them we
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* have to split them into two 32-bit halves and do the math manually.
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*
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* Instead of instantiating and passing small structures around to do this, we
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* instead just use two global temporary values. This one stores the low 32
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* bits of a split value - for example, if the original value was a 64-bit
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* integer, this temporary value will contain the low 32 bits of that integer.
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* If the original value was a double, this temporary value will contain the
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* low 32 bits of the binary representation of that double, etcetera.
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* @type {number}
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*/
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jspb.utils.split64Low = 0;
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/**
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* And correspondingly, this temporary variable will contain the high 32 bits
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* of whatever value was split.
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* @type {number}
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*/
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jspb.utils.split64High = 0;
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/**
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* Splits an unsigned Javascript integer into two 32-bit halves and stores it
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* in the temp values above.
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* @param {number} value The number to split.
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*/
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jspb.utils.splitUint64 = function(value) {
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// Extract low 32 bits and high 32 bits as unsigned integers.
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var lowBits = value >>> 0;
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var highBits = Math.floor((value - lowBits) /
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jspb.BinaryConstants.TWO_TO_32) >>> 0;
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jspb.utils.split64Low = lowBits;
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jspb.utils.split64High = highBits;
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};
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/**
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* Splits a signed Javascript integer into two 32-bit halves and stores it in
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* the temp values above.
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* @param {number} value The number to split.
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*/
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jspb.utils.splitInt64 = function(value) {
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// Convert to sign-magnitude representation.
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var sign = (value < 0);
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value = Math.abs(value);
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// Extract low 32 bits and high 32 bits as unsigned integers.
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var lowBits = value >>> 0;
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var highBits = Math.floor((value - lowBits) /
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jspb.BinaryConstants.TWO_TO_32);
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highBits = highBits >>> 0;
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// Perform two's complement conversion if the sign bit was set.
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if (sign) {
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highBits = ~highBits >>> 0;
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lowBits = ~lowBits >>> 0;
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lowBits += 1;
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if (lowBits > 0xFFFFFFFF) {
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lowBits = 0;
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highBits++;
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if (highBits > 0xFFFFFFFF) highBits = 0;
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}
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}
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jspb.utils.split64Low = lowBits;
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jspb.utils.split64High = highBits;
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};
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/**
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* Convers a signed Javascript integer into zigzag format, splits it into two
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* 32-bit halves, and stores it in the temp values above.
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* @param {number} value The number to split.
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*/
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jspb.utils.splitZigzag64 = function(value) {
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// Convert to sign-magnitude and scale by 2 before we split the value.
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var sign = (value < 0);
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value = Math.abs(value) * 2;
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jspb.utils.splitUint64(value);
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var lowBits = jspb.utils.split64Low;
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var highBits = jspb.utils.split64High;
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// If the value is negative, subtract 1 from the split representation so we
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// don't lose the sign bit due to precision issues.
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if (sign) {
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if (lowBits == 0) {
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if (highBits == 0) {
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lowBits = 0xFFFFFFFF;
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highBits = 0xFFFFFFFF;
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} else {
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highBits--;
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lowBits = 0xFFFFFFFF;
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}
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} else {
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lowBits--;
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}
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}
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jspb.utils.split64Low = lowBits;
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jspb.utils.split64High = highBits;
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};
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/**
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* Converts a floating-point number into 32-bit IEEE representation and stores
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* it in the temp values above.
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* @param {number} value
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*/
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jspb.utils.splitFloat32 = function(value) {
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var sign = (value < 0) ? 1 : 0;
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value = sign ? -value : value;
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var exp;
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var mant;
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// Handle zeros.
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if (value === 0) {
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if ((1 / value) > 0) {
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// Positive zero.
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jspb.utils.split64High = 0;
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jspb.utils.split64Low = 0x00000000;
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} else {
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// Negative zero.
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jspb.utils.split64High = 0;
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jspb.utils.split64Low = 0x80000000;
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}
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return;
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}
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// Handle nans.
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if (isNaN(value)) {
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jspb.utils.split64High = 0;
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jspb.utils.split64Low = 0x7FFFFFFF;
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return;
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}
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// Handle infinities.
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if (value > jspb.BinaryConstants.FLOAT32_MAX) {
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jspb.utils.split64High = 0;
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jspb.utils.split64Low = ((sign << 31) | (0x7F800000)) >>> 0;
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return;
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}
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// Handle denormals.
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if (value < jspb.BinaryConstants.FLOAT32_MIN) {
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// Number is a denormal.
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mant = Math.round(value / Math.pow(2, -149));
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jspb.utils.split64High = 0;
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jspb.utils.split64Low = ((sign << 31) | mant) >>> 0;
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return;
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}
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exp = Math.floor(Math.log(value) / Math.LN2);
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mant = value * Math.pow(2, -exp);
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mant = Math.round(mant * jspb.BinaryConstants.TWO_TO_23) & 0x7FFFFF;
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jspb.utils.split64High = 0;
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jspb.utils.split64Low = ((sign << 31) | ((exp + 127) << 23) | mant) >>> 0;
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};
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/**
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* Converts a floating-point number into 64-bit IEEE representation and stores
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* it in the temp values above.
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* @param {number} value
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*/
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jspb.utils.splitFloat64 = function(value) {
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var sign = (value < 0) ? 1 : 0;
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value = sign ? -value : value;
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// Handle zeros.
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if (value === 0) {
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if ((1 / value) > 0) {
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// Positive zero.
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jspb.utils.split64High = 0x00000000;
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jspb.utils.split64Low = 0x00000000;
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} else {
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// Negative zero.
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jspb.utils.split64High = 0x80000000;
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jspb.utils.split64Low = 0x00000000;
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}
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return;
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}
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// Handle nans.
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if (isNaN(value)) {
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jspb.utils.split64High = 0x7FFFFFFF;
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jspb.utils.split64Low = 0xFFFFFFFF;
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return;
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}
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// Handle infinities.
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if (value > jspb.BinaryConstants.FLOAT64_MAX) {
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jspb.utils.split64High = ((sign << 31) | (0x7FF00000)) >>> 0;
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jspb.utils.split64Low = 0;
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return;
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}
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// Handle denormals.
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if (value < jspb.BinaryConstants.FLOAT64_MIN) {
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// Number is a denormal.
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var mant = value / Math.pow(2, -1074);
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var mantHigh = (mant / jspb.BinaryConstants.TWO_TO_32);
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jspb.utils.split64High = ((sign << 31) | mantHigh) >>> 0;
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jspb.utils.split64Low = (mant >>> 0);
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return;
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}
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var exp = Math.floor(Math.log(value) / Math.LN2);
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if (exp == 1024) exp = 1023;
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var mant = value * Math.pow(2, -exp);
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var mantHigh = (mant * jspb.BinaryConstants.TWO_TO_20) & 0xFFFFF;
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var mantLow = (mant * jspb.BinaryConstants.TWO_TO_52) >>> 0;
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jspb.utils.split64High =
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((sign << 31) | ((exp + 1023) << 20) | mantHigh) >>> 0;
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jspb.utils.split64Low = mantLow;
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};
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/**
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* Converts an 8-character hash string into two 32-bit numbers and stores them
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* in the temp values above.
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* @param {string} hash
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*/
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jspb.utils.splitHash64 = function(hash) {
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var a = hash.charCodeAt(0);
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var b = hash.charCodeAt(1);
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var c = hash.charCodeAt(2);
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var d = hash.charCodeAt(3);
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var e = hash.charCodeAt(4);
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var f = hash.charCodeAt(5);
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var g = hash.charCodeAt(6);
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var h = hash.charCodeAt(7);
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jspb.utils.split64Low = (a + (b << 8) + (c << 16) + (d << 24)) >>> 0;
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jspb.utils.split64High = (e + (f << 8) + (g << 16) + (h << 24)) >>> 0;
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};
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/**
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* Joins two 32-bit values into a 64-bit unsigned integer. Precision will be
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* lost if the result is greater than 2^52.
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* @param {number} bitsLow
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* @param {number} bitsHigh
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* @return {number}
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*/
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jspb.utils.joinUint64 = function(bitsLow, bitsHigh) {
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return bitsHigh * jspb.BinaryConstants.TWO_TO_32 + bitsLow;
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};
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/**
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* Joins two 32-bit values into a 64-bit signed integer. Precision will be lost
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* if the result is greater than 2^52.
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* @param {number} bitsLow
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* @param {number} bitsHigh
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* @return {number}
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*/
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jspb.utils.joinInt64 = function(bitsLow, bitsHigh) {
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// If the high bit is set, do a manual two's complement conversion.
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var sign = (bitsHigh & 0x80000000);
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if (sign) {
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bitsLow = (~bitsLow + 1) >>> 0;
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bitsHigh = ~bitsHigh >>> 0;
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if (bitsLow == 0) {
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bitsHigh = (bitsHigh + 1) >>> 0;
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}
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}
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var result = jspb.utils.joinUint64(bitsLow, bitsHigh);
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return sign ? -result : result;
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};
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/**
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* Joins two 32-bit values into a 64-bit unsigned integer and applies zigzag
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* decoding. Precision will be lost if the result is greater than 2^52.
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* @param {number} bitsLow
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* @param {number} bitsHigh
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* @return {number}
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*/
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jspb.utils.joinZigzag64 = function(bitsLow, bitsHigh) {
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// Extract the sign bit and shift right by one.
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var sign = bitsLow & 1;
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bitsLow = ((bitsLow >>> 1) | (bitsHigh << 31)) >>> 0;
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bitsHigh = bitsHigh >>> 1;
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// Increment the split value if the sign bit was set.
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if (sign) {
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bitsLow = (bitsLow + 1) >>> 0;
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if (bitsLow == 0) {
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bitsHigh = (bitsHigh + 1) >>> 0;
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}
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}
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var result = jspb.utils.joinUint64(bitsLow, bitsHigh);
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return sign ? -result : result;
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};
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/**
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* Joins two 32-bit values into a 32-bit IEEE floating point number and
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* converts it back into a Javascript number.
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* @param {number} bitsLow The low 32 bits of the binary number;
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* @param {number} bitsHigh The high 32 bits of the binary number.
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* @return {number}
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*/
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jspb.utils.joinFloat32 = function(bitsLow, bitsHigh) {
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var sign = ((bitsLow >> 31) * 2 + 1);
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var exp = (bitsLow >>> 23) & 0xFF;
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var mant = bitsLow & 0x7FFFFF;
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if (exp == 0xFF) {
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if (mant) {
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return NaN;
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} else {
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return sign * Infinity;
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}
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}
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if (exp == 0) {
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// Denormal.
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return sign * Math.pow(2, -149) * mant;
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} else {
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return sign * Math.pow(2, exp - 150) *
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(mant + Math.pow(2, 23));
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}
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};
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/**
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* Joins two 32-bit values into a 64-bit IEEE floating point number and
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* converts it back into a Javascript number.
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* @param {number} bitsLow The low 32 bits of the binary number;
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* @param {number} bitsHigh The high 32 bits of the binary number.
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* @return {number}
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*/
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jspb.utils.joinFloat64 = function(bitsLow, bitsHigh) {
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var sign = ((bitsHigh >> 31) * 2 + 1);
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var exp = (bitsHigh >>> 20) & 0x7FF;
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var mant = jspb.BinaryConstants.TWO_TO_32 * (bitsHigh & 0xFFFFF) + bitsLow;
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if (exp == 0x7FF) {
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if (mant) {
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return NaN;
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} else {
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return sign * Infinity;
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}
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}
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if (exp == 0) {
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// Denormal.
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return sign * Math.pow(2, -1074) * mant;
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} else {
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return sign * Math.pow(2, exp - 1075) *
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(mant + jspb.BinaryConstants.TWO_TO_52);
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}
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};
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/**
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* Joins two 32-bit values into an 8-character hash string.
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* @param {number} bitsLow
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* @param {number} bitsHigh
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* @return {string}
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*/
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jspb.utils.joinHash64 = function(bitsLow, bitsHigh) {
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var a = (bitsLow >>> 0) & 0xFF;
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var b = (bitsLow >>> 8) & 0xFF;
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var c = (bitsLow >>> 16) & 0xFF;
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var d = (bitsLow >>> 24) & 0xFF;
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var e = (bitsHigh >>> 0) & 0xFF;
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var f = (bitsHigh >>> 8) & 0xFF;
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var g = (bitsHigh >>> 16) & 0xFF;
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var h = (bitsHigh >>> 24) & 0xFF;
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return String.fromCharCode(a, b, c, d, e, f, g, h);
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};
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/**
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* Individual digits for number->string conversion.
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* @const {!Array<string>}
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*/
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jspb.utils.DIGITS = [
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'0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
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];
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/**
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* Losslessly converts a 64-bit unsigned integer in 32:32 split representation
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* into a decimal string.
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* @param {number} bitsLow The low 32 bits of the binary number;
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* @param {number} bitsHigh The high 32 bits of the binary number.
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* @return {string} The binary number represented as a string.
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*/
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jspb.utils.joinUnsignedDecimalString = function(bitsLow, bitsHigh) {
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// Skip the expensive conversion if the number is small enough to use the
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// built-in conversions.
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if (bitsHigh <= 0x1FFFFF) {
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return '' + (jspb.BinaryConstants.TWO_TO_32 * bitsHigh + bitsLow);
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}
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// What this code is doing is essentially converting the input number from
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// base-2 to base-1e7, which allows us to represent the 64-bit range with
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// only 3 (very large) digits. Those digits are then trivial to convert to
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// a base-10 string.
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// The magic numbers used here are -
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// 2^24 = 16777216 = (1,6777216) in base-1e7.
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// 2^48 = 281474976710656 = (2,8147497,6710656) in base-1e7.
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// Split 32:32 representation into 16:24:24 representation so our
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// intermediate digits don't overflow.
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var low = bitsLow & 0xFFFFFF;
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var mid = (((bitsLow >>> 24) | (bitsHigh << 8)) >>> 0) & 0xFFFFFF;
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var high = (bitsHigh >> 16) & 0xFFFF;
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// Assemble our three base-1e7 digits, ignoring carries. The maximum
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// value in a digit at this step is representable as a 48-bit integer, which
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// can be stored in a 64-bit floating point number.
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var digitA = low + (mid * 6777216) + (high * 6710656);
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var digitB = mid + (high * 8147497);
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var digitC = (high * 2);
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// Apply carries from A to B and from B to C.
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var base = 10000000;
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if (digitA >= base) {
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digitB += Math.floor(digitA / base);
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digitA %= base;
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}
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if (digitB >= base) {
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digitC += Math.floor(digitB / base);
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digitB %= base;
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}
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// Convert base-1e7 digits to base-10, omitting leading zeroes.
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var table = jspb.utils.DIGITS;
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var start = false;
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var result = '';
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function emit(digit) {
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var temp = base;
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for (var i = 0; i < 7; i++) {
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temp /= 10;
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var decimalDigit = ((digit / temp) % 10) >>> 0;
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if ((decimalDigit == 0) && !start) continue;
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start = true;
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result += table[decimalDigit];
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}
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}
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if (digitC || start) emit(digitC);
|
|
if (digitB || start) emit(digitB);
|
|
if (digitA || start) emit(digitA);
|
|
|
|
return result;
|
|
};
|
|
|
|
|
|
/**
|
|
* Losslessly converts a 64-bit signed integer in 32:32 split representation
|
|
* into a decimal string.
|
|
* @param {number} bitsLow The low 32 bits of the binary number;
|
|
* @param {number} bitsHigh The high 32 bits of the binary number.
|
|
* @return {string} The binary number represented as a string.
|
|
*/
|
|
jspb.utils.joinSignedDecimalString = function(bitsLow, bitsHigh) {
|
|
// If we're treating the input as a signed value and the high bit is set, do
|
|
// a manual two's complement conversion before the decimal conversion.
|
|
var negative = (bitsHigh & 0x80000000);
|
|
if (negative) {
|
|
bitsLow = (~bitsLow + 1) >>> 0;
|
|
var carry = (bitsLow == 0) ? 1 : 0;
|
|
bitsHigh = (~bitsHigh + carry) >>> 0;
|
|
}
|
|
|
|
var result = jspb.utils.joinUnsignedDecimalString(bitsLow, bitsHigh);
|
|
return negative ? '-' + result : result;
|
|
};
|
|
|
|
|
|
/**
|
|
* Convert an 8-character hash string representing either a signed or unsigned
|
|
* 64-bit integer into its decimal representation without losing accuracy.
|
|
* @param {string} hash The hash string to convert.
|
|
* @param {boolean} signed True if we should treat the hash string as encoding
|
|
* a signed integer.
|
|
* @return {string}
|
|
*/
|
|
jspb.utils.hash64ToDecimalString = function(hash, signed) {
|
|
jspb.utils.splitHash64(hash);
|
|
var bitsLow = jspb.utils.split64Low;
|
|
var bitsHigh = jspb.utils.split64High;
|
|
return signed ?
|
|
jspb.utils.joinSignedDecimalString(bitsLow, bitsHigh) :
|
|
jspb.utils.joinUnsignedDecimalString(bitsLow, bitsHigh);
|
|
};
|
|
|
|
|
|
/**
|
|
* Converts an array of 8-character hash strings into their decimal
|
|
* representations.
|
|
* @param {!Array<string>} hashes The array of hash strings to convert.
|
|
* @param {boolean} signed True if we should treat the hash string as encoding
|
|
* a signed integer.
|
|
* @return {!Array<string>}
|
|
*/
|
|
jspb.utils.hash64ArrayToDecimalStrings = function(hashes, signed) {
|
|
var result = new Array(hashes.length);
|
|
for (var i = 0; i < hashes.length; i++) {
|
|
result[i] = jspb.utils.hash64ToDecimalString(hashes[i], signed);
|
|
}
|
|
return result;
|
|
};
|
|
|
|
|
|
/**
|
|
* Converts a signed or unsigned decimal string into its hash string
|
|
* representation.
|
|
* @param {string} dec
|
|
* @return {string}
|
|
*/
|
|
jspb.utils.decimalStringToHash64 = function(dec) {
|
|
goog.asserts.assert(dec.length > 0);
|
|
|
|
// Check for minus sign.
|
|
var minus = false;
|
|
if (dec[0] === '-') {
|
|
minus = true;
|
|
dec = dec.slice(1);
|
|
}
|
|
|
|
// Store result as a byte array.
|
|
var resultBytes = [0, 0, 0, 0, 0, 0, 0, 0];
|
|
|
|
// Set result to m*result + c.
|
|
function muladd(m, c) {
|
|
for (var i = 0; i < 8 && (m !== 1 || c > 0); i++) {
|
|
var r = m * resultBytes[i] + c;
|
|
resultBytes[i] = r & 0xFF;
|
|
c = r >>> 8;
|
|
}
|
|
}
|
|
|
|
// Negate the result bits.
|
|
function neg() {
|
|
for (var i = 0; i < 8; i++) {
|
|
resultBytes[i] = (~resultBytes[i]) & 0xFF;
|
|
}
|
|
}
|
|
|
|
// For each decimal digit, set result to 10*result + digit.
|
|
for (var i = 0; i < dec.length; i++) {
|
|
muladd(10, jspb.utils.DIGITS.indexOf(dec[i]));
|
|
}
|
|
|
|
// If there's a minus sign, convert into two's complement.
|
|
if (minus) {
|
|
neg();
|
|
muladd(1, 1);
|
|
}
|
|
|
|
return goog.crypt.byteArrayToString(resultBytes);
|
|
};
|
|
|
|
|
|
/**
|
|
* Converts a signed or unsigned decimal string into two 32-bit halves, and
|
|
* stores them in the temp variables listed above.
|
|
* @param {string} value The decimal string to convert.
|
|
*/
|
|
jspb.utils.splitDecimalString = function(value) {
|
|
jspb.utils.splitHash64(jspb.utils.decimalStringToHash64(value));
|
|
};
|
|
|
|
|
|
/**
|
|
* Converts an 8-character hash string into its hexadecimal representation.
|
|
* @param {string} hash
|
|
* @return {string}
|
|
*/
|
|
jspb.utils.hash64ToHexString = function(hash) {
|
|
var temp = new Array(18);
|
|
temp[0] = '0';
|
|
temp[1] = 'x';
|
|
|
|
for (var i = 0; i < 8; i++) {
|
|
var c = hash.charCodeAt(7 - i);
|
|
temp[i * 2 + 2] = jspb.utils.DIGITS[c >> 4];
|
|
temp[i * 2 + 3] = jspb.utils.DIGITS[c & 0xF];
|
|
}
|
|
|
|
var result = temp.join('');
|
|
return result;
|
|
};
|
|
|
|
|
|
/**
|
|
* Converts a '0x<16 digits>' hex string into its hash string representation.
|
|
* @param {string} hex
|
|
* @return {string}
|
|
*/
|
|
jspb.utils.hexStringToHash64 = function(hex) {
|
|
hex = hex.toLowerCase();
|
|
goog.asserts.assert(hex.length == 18);
|
|
goog.asserts.assert(hex[0] == '0');
|
|
goog.asserts.assert(hex[1] == 'x');
|
|
|
|
var result = '';
|
|
for (var i = 0; i < 8; i++) {
|
|
var hi = jspb.utils.DIGITS.indexOf(hex[i * 2 + 2]);
|
|
var lo = jspb.utils.DIGITS.indexOf(hex[i * 2 + 3]);
|
|
result = String.fromCharCode(hi * 16 + lo) + result;
|
|
}
|
|
|
|
return result;
|
|
};
|
|
|
|
|
|
/**
|
|
* Convert an 8-character hash string representing either a signed or unsigned
|
|
* 64-bit integer into a Javascript number. Will lose accuracy if the result is
|
|
* larger than 2^52.
|
|
* @param {string} hash The hash string to convert.
|
|
* @param {boolean} signed True if the has should be interpreted as a signed
|
|
* number.
|
|
* @return {number}
|
|
*/
|
|
jspb.utils.hash64ToNumber = function(hash, signed) {
|
|
jspb.utils.splitHash64(hash);
|
|
var bitsLow = jspb.utils.split64Low;
|
|
var bitsHigh = jspb.utils.split64High;
|
|
return signed ? jspb.utils.joinInt64(bitsLow, bitsHigh) :
|
|
jspb.utils.joinUint64(bitsLow, bitsHigh);
|
|
};
|
|
|
|
|
|
/**
|
|
* Convert a Javascript number into an 8-character hash string. Will lose
|
|
* precision if the value is non-integral or greater than 2^64.
|
|
* @param {number} value The integer to convert.
|
|
* @return {string}
|
|
*/
|
|
jspb.utils.numberToHash64 = function(value) {
|
|
jspb.utils.splitInt64(value);
|
|
return jspb.utils.joinHash64(jspb.utils.split64Low,
|
|
jspb.utils.split64High);
|
|
};
|
|
|
|
|
|
/**
|
|
* Counts the number of contiguous varints in a buffer.
|
|
* @param {!Uint8Array} buffer The buffer to scan.
|
|
* @param {number} start The starting point in the buffer to scan.
|
|
* @param {number} end The end point in the buffer to scan.
|
|
* @return {number} The number of varints in the buffer.
|
|
*/
|
|
jspb.utils.countVarints = function(buffer, start, end) {
|
|
// Count how many high bits of each byte were set in the buffer.
|
|
var count = 0;
|
|
for (var i = start; i < end; i++) {
|
|
count += buffer[i] >> 7;
|
|
}
|
|
|
|
// The number of varints in the buffer equals the size of the buffer minus
|
|
// the number of non-terminal bytes in the buffer (those with the high bit
|
|
// set).
|
|
return (end - start) - count;
|
|
};
|
|
|
|
|
|
/**
|
|
* Counts the number of contiguous varint fields with the given field number in
|
|
* the buffer.
|
|
* @param {!Uint8Array} buffer The buffer to scan.
|
|
* @param {number} start The starting point in the buffer to scan.
|
|
* @param {number} end The end point in the buffer to scan.
|
|
* @param {number} field The field number to count.
|
|
* @return {number} The number of matching fields in the buffer.
|
|
*/
|
|
jspb.utils.countVarintFields = function(buffer, start, end, field) {
|
|
var count = 0;
|
|
var cursor = start;
|
|
var tag = field * 8 + jspb.BinaryConstants.WireType.VARINT;
|
|
|
|
if (tag < 128) {
|
|
// Single-byte field tag, we can use a slightly quicker count.
|
|
while (cursor < end) {
|
|
// Skip the field tag, or exit if we find a non-matching tag.
|
|
if (buffer[cursor++] != tag) return count;
|
|
|
|
// Field tag matches, we've found a valid field.
|
|
count++;
|
|
|
|
// Skip the varint.
|
|
while (1) {
|
|
var x = buffer[cursor++];
|
|
if ((x & 0x80) == 0) break;
|
|
}
|
|
}
|
|
} else {
|
|
while (cursor < end) {
|
|
// Skip the field tag, or exit if we find a non-matching tag.
|
|
var temp = tag;
|
|
while (temp > 128) {
|
|
if (buffer[cursor] != ((temp & 0x7F) | 0x80)) return count;
|
|
cursor++;
|
|
temp >>= 7;
|
|
}
|
|
if (buffer[cursor++] != temp) return count;
|
|
|
|
// Field tag matches, we've found a valid field.
|
|
count++;
|
|
|
|
// Skip the varint.
|
|
while (1) {
|
|
var x = buffer[cursor++];
|
|
if ((x & 0x80) == 0) break;
|
|
}
|
|
}
|
|
}
|
|
return count;
|
|
};
|
|
|
|
|
|
/**
|
|
* Counts the number of contiguous fixed32 fields with the given tag in the
|
|
* buffer.
|
|
* @param {!Uint8Array} buffer The buffer to scan.
|
|
* @param {number} start The starting point in the buffer to scan.
|
|
* @param {number} end The end point in the buffer to scan.
|
|
* @param {number} tag The tag value to count.
|
|
* @param {number} stride The number of bytes to skip per field.
|
|
* @return {number} The number of fields with a matching tag in the buffer.
|
|
* @private
|
|
*/
|
|
jspb.utils.countFixedFields_ =
|
|
function(buffer, start, end, tag, stride) {
|
|
var count = 0;
|
|
var cursor = start;
|
|
|
|
if (tag < 128) {
|
|
// Single-byte field tag, we can use a slightly quicker count.
|
|
while (cursor < end) {
|
|
// Skip the field tag, or exit if we find a non-matching tag.
|
|
if (buffer[cursor++] != tag) return count;
|
|
|
|
// Field tag matches, we've found a valid field.
|
|
count++;
|
|
|
|
// Skip the value.
|
|
cursor += stride;
|
|
}
|
|
} else {
|
|
while (cursor < end) {
|
|
// Skip the field tag, or exit if we find a non-matching tag.
|
|
var temp = tag;
|
|
while (temp > 128) {
|
|
if (buffer[cursor++] != ((temp & 0x7F) | 0x80)) return count;
|
|
temp >>= 7;
|
|
}
|
|
if (buffer[cursor++] != temp) return count;
|
|
|
|
// Field tag matches, we've found a valid field.
|
|
count++;
|
|
|
|
// Skip the value.
|
|
cursor += stride;
|
|
}
|
|
}
|
|
return count;
|
|
};
|
|
|
|
|
|
/**
|
|
* Counts the number of contiguous fixed32 fields with the given field number
|
|
* in the buffer.
|
|
* @param {!Uint8Array} buffer The buffer to scan.
|
|
* @param {number} start The starting point in the buffer to scan.
|
|
* @param {number} end The end point in the buffer to scan.
|
|
* @param {number} field The field number to count.
|
|
* @return {number} The number of matching fields in the buffer.
|
|
*/
|
|
jspb.utils.countFixed32Fields = function(buffer, start, end, field) {
|
|
var tag = field * 8 + jspb.BinaryConstants.WireType.FIXED32;
|
|
return jspb.utils.countFixedFields_(buffer, start, end, tag, 4);
|
|
};
|
|
|
|
|
|
/**
|
|
* Counts the number of contiguous fixed64 fields with the given field number
|
|
* in the buffer.
|
|
* @param {!Uint8Array} buffer The buffer to scan.
|
|
* @param {number} start The starting point in the buffer to scan.
|
|
* @param {number} end The end point in the buffer to scan.
|
|
* @param {number} field The field number to count
|
|
* @return {number} The number of matching fields in the buffer.
|
|
*/
|
|
jspb.utils.countFixed64Fields = function(buffer, start, end, field) {
|
|
var tag = field * 8 + jspb.BinaryConstants.WireType.FIXED64;
|
|
return jspb.utils.countFixedFields_(buffer, start, end, tag, 8);
|
|
};
|
|
|
|
|
|
/**
|
|
* Counts the number of contiguous delimited fields with the given field number
|
|
* in the buffer.
|
|
* @param {!Uint8Array} buffer The buffer to scan.
|
|
* @param {number} start The starting point in the buffer to scan.
|
|
* @param {number} end The end point in the buffer to scan.
|
|
* @param {number} field The field number to count.
|
|
* @return {number} The number of matching fields in the buffer.
|
|
*/
|
|
jspb.utils.countDelimitedFields = function(buffer, start, end, field) {
|
|
var count = 0;
|
|
var cursor = start;
|
|
var tag = field * 8 + jspb.BinaryConstants.WireType.DELIMITED;
|
|
|
|
while (cursor < end) {
|
|
// Skip the field tag, or exit if we find a non-matching tag.
|
|
var temp = tag;
|
|
while (temp > 128) {
|
|
if (buffer[cursor++] != ((temp & 0x7F) | 0x80)) return count;
|
|
temp >>= 7;
|
|
}
|
|
if (buffer[cursor++] != temp) return count;
|
|
|
|
// Field tag matches, we've found a valid field.
|
|
count++;
|
|
|
|
// Decode the length prefix.
|
|
var length = 0;
|
|
var shift = 1;
|
|
while (1) {
|
|
temp = buffer[cursor++];
|
|
length += (temp & 0x7f) * shift;
|
|
shift *= 128;
|
|
if ((temp & 0x80) == 0) break;
|
|
}
|
|
|
|
// Advance the cursor past the blob.
|
|
cursor += length;
|
|
}
|
|
return count;
|
|
};
|
|
|
|
|
|
/**
|
|
* String-ify bytes for text format. Should be optimized away in non-debug.
|
|
* The returned string uses \xXX escapes for all values and is itself quoted.
|
|
* [1, 31] serializes to '"\x01\x1f"'.
|
|
* @param {jspb.ByteSource} byteSource The bytes to serialize.
|
|
* @return {string} Stringified bytes for text format.
|
|
*/
|
|
jspb.utils.debugBytesToTextFormat = function(byteSource) {
|
|
var s = '"';
|
|
if (byteSource) {
|
|
var bytes = jspb.utils.byteSourceToUint8Array(byteSource);
|
|
for (var i = 0; i < bytes.length; i++) {
|
|
s += '\\x';
|
|
if (bytes[i] < 16) s += '0';
|
|
s += bytes[i].toString(16);
|
|
}
|
|
}
|
|
return s + '"';
|
|
};
|
|
|
|
|
|
/**
|
|
* String-ify a scalar for text format. Should be optimized away in non-debug.
|
|
* @param {string|number|boolean} scalar The scalar to stringify.
|
|
* @return {string} Stringified scalar for text format.
|
|
*/
|
|
jspb.utils.debugScalarToTextFormat = function(scalar) {
|
|
if (goog.isString(scalar)) {
|
|
return goog.string.quote(scalar);
|
|
} else {
|
|
return scalar.toString();
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* Utility function: convert a string with codepoints 0--255 inclusive to a
|
|
* Uint8Array. If any codepoints greater than 255 exist in the string, throws an
|
|
* exception.
|
|
* @param {string} str
|
|
* @return {!Uint8Array}
|
|
*/
|
|
jspb.utils.stringToByteArray = function(str) {
|
|
var arr = new Uint8Array(str.length);
|
|
for (var i = 0; i < str.length; i++) {
|
|
var codepoint = str.charCodeAt(i);
|
|
if (codepoint > 255) {
|
|
throw new Error('Conversion error: string contains codepoint ' +
|
|
'outside of byte range');
|
|
}
|
|
arr[i] = codepoint;
|
|
}
|
|
return arr;
|
|
};
|
|
|
|
|
|
/**
|
|
* Converts any type defined in jspb.ByteSource into a Uint8Array.
|
|
* @param {!jspb.ByteSource} data
|
|
* @return {!Uint8Array}
|
|
* @suppress {invalidCasts}
|
|
*/
|
|
jspb.utils.byteSourceToUint8Array = function(data) {
|
|
if (data.constructor === Uint8Array) {
|
|
return /** @type {!Uint8Array} */(data);
|
|
}
|
|
|
|
if (data.constructor === ArrayBuffer) {
|
|
data = /** @type {!ArrayBuffer} */(data);
|
|
return /** @type {!Uint8Array} */(new Uint8Array(data));
|
|
}
|
|
|
|
if (data.constructor === Buffer) {
|
|
return /** @type {!Uint8Array} */(new Uint8Array(data));
|
|
}
|
|
|
|
if (data.constructor === Array) {
|
|
data = /** @type {!Array<number>} */(data);
|
|
return /** @type {!Uint8Array} */(new Uint8Array(data));
|
|
}
|
|
|
|
if (data.constructor === String) {
|
|
data = /** @type {string} */(data);
|
|
return goog.crypt.base64.decodeStringToUint8Array(data);
|
|
}
|
|
|
|
goog.asserts.fail('Type not convertible to Uint8Array.');
|
|
return /** @type {!Uint8Array} */(new Uint8Array(0));
|
|
};
|