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patchIssue3992: decouple from Layout module
Provide the patch for Node.js issue #3992 as a standalone module. See: nodejs/node#3992
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| /* Material in this file modified from Node.js under LICENSE: | ||
| Copyright Joyent, Inc. and other Node contributors. All rights reserved. | ||
| Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| of this software and associated documentation files (the "Software"), to | ||
| deal in the Software without restriction, including without limitation the | ||
| rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | ||
| sell copies of the Software, and to permit persons to whom the Software is | ||
| furnished to do so, subject to the following conditions: | ||
| The above copyright notice and this permission notice shall be included in | ||
| all copies or substantial portions of the Software. | ||
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
| FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | ||
| IN THE SOFTWARE. | ||
| */ | ||
|
|
||
| /** Determine whether {@link | ||
| * https://github.com/nodejs/node/issues/3992|Node.js issue #3992} is | ||
| * fixed, and if not replace the Buffer functions with ones that work | ||
| * correctly. | ||
| * | ||
| * This module exports no behavior. It may modify the Buffer | ||
| * prototype. | ||
| * | ||
| * This module originates from {@link | ||
| * https://github.com/pabigot/buffer-layout|buffer-layout on GitHub}. | ||
| * | ||
| * @module patchIssue3992 | ||
| * @license MIT | ||
| */ | ||
|
|
||
| /* Test whether Buffer.writeIntLE() gets the right answer for | ||
| * problematic negative integers */ | ||
| var issue_3992_is_resolved = (function () { | ||
| var buf = new Buffer(2); | ||
| buf.writeIntLE(-0x100, 0, 2); | ||
| // The value would be 0xFE if the bug is present | ||
| return (0xFF === buf[1]); | ||
| })(); | ||
|
|
||
| /* NB: Backfill code modified from node lib/buffer.js as of | ||
| * 8bc80386879538de63cd6f2aef288f59324eb004 (2015-11-20) */ | ||
| /* istanbul ignore next */ | ||
| function checkInt(buffer, value, offset, ext, max, min) { | ||
| if (!(buffer instanceof Buffer)) | ||
| throw new TypeError('"buffer" argument must be a Buffer instance'); | ||
| if (value > max || value < min) | ||
| throw new TypeError('"value" argument is out of bounds'); | ||
| if (offset + ext > buffer.length) | ||
| throw new RangeError('Index out of range'); | ||
| } | ||
|
|
||
| /* The grotesquery here is because jshint whines about strict mode | ||
| * violations if the function doesn't appear to be a method, and about | ||
| * defining functions within a block if the test is in an if | ||
| * statement. */ | ||
| Buffer.prototype.writeIntLE = issue_3992_is_resolved ? Buffer.prototype.writeIntLE : function(value, offset, byteLength, noAssert) { | ||
| value = +value; | ||
| offset = offset >>> 0; | ||
| if (!noAssert) { | ||
| checkInt(this, | ||
| value, | ||
| offset, | ||
| byteLength, | ||
| Math.pow(2, 8 * byteLength - 1) - 1, | ||
| -Math.pow(2, 8 * byteLength - 1)); | ||
| } | ||
|
|
||
| var i = 0; | ||
| var mul = 1; | ||
| var sub = 0; | ||
| this[offset] = value; | ||
| while (++i < byteLength && (mul *= 0x100)) { | ||
| if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) | ||
| sub = 1; | ||
| this[offset + i] = ((value / mul) >> 0) - sub; | ||
| } | ||
|
|
||
| return offset + byteLength; | ||
| }; | ||
|
|
||
| Buffer.prototype.writeIntBE = issue_3992_is_resolved ? Buffer.prototype.writeIntBE : function(value, offset, byteLength, noAssert) { | ||
| value = +value; | ||
| offset = offset >>> 0; | ||
| if (!noAssert) { | ||
| checkInt(this, | ||
| value, | ||
| offset, | ||
| byteLength, | ||
| Math.pow(2, 8 * byteLength - 1) - 1, | ||
| -Math.pow(2, 8 * byteLength - 1)); | ||
| } | ||
|
|
||
| var i = byteLength - 1; | ||
| var mul = 1; | ||
| var sub = 0; | ||
| this[offset + i] = value; | ||
| while (--i >= 0 && (mul *= 0x100)) { | ||
| if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) | ||
| sub = 1; | ||
| this[offset + i] = ((value / mul) >> 0) - sub; | ||
| } | ||
|
|
||
| return offset + byteLength; | ||
| }; |
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