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| <a href="../../index.html">All files</a> / <a href="index.html">tar/lib</a> large-numbers.js |
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| <span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">'use strict' |
| // Tar can encode large and negative numbers using a leading byte of |
| // 0xff for negative, and 0x80 for positive. The trailing byte in the |
| // section will always be 0x20, or in some implementations 0x00. |
| // this module encodes and decodes these things. |
| |
| const encode = exports.encode = (num, buf) => { |
| buf[buf.length - 1] = 0x20 |
| if (num < 0) |
| encodeNegative(num, buf) |
| else |
| encodePositive(num, buf) |
| return buf |
| } |
| |
| const encodePositive = (num, buf) => { |
| buf[0] = 0x80 |
| for (var i = buf.length - 2; i > 0; i--) { |
| if (num === 0) |
| buf[i] = 0 |
| else { |
| buf[i] = num % 0x100 |
| num = Math.floor(num / 0x100) |
| } |
| } |
| } |
| |
| const encodeNegative = (num, buf) => { |
| buf[0] = 0xff |
| var flipped = false |
| num = num * -1 |
| for (var i = buf.length - 2; i > 0; i--) { |
| var byte |
| if (num === 0) |
| byte = 0 |
| else { |
| byte = num % 0x100 |
| num = Math.floor(num / 0x100) |
| } |
| if (flipped) |
| buf[i] = onesComp(byte) |
| else if (byte === 0) |
| buf[i] = 0 |
| else { |
| flipped = true |
| buf[i] = twosComp(byte) |
| } |
| } |
| } |
| |
| const parse = exports.parse = (buf) => { |
| var post = buf[buf.length - 1] |
| var pre = buf[0] |
| return pre === 0x80 ? pos(buf.slice(1, buf.length - 1)) |
| : twos(buf.slice(1, buf.length - 1)) |
| } |
| |
| const twos = (buf) => { |
| var len = buf.length |
| var sum = 0 |
| var flipped = false |
| for (var i = len - 1; i > -1; i--) { |
| var byte = buf[i] |
| var f |
| if (flipped) |
| f = onesComp(byte) |
| else if (byte === 0) |
| f = byte |
| else { |
| flipped = true |
| f = twosComp(byte) |
| } |
| if (f !== 0) |
| sum += f * Math.pow(256, len - i - 1) |
| } |
| return sum * -1 |
| } |
| |
| const pos = (buf) => { |
| var len = buf.length |
| var sum = 0 |
| for (var i = len - 1; i > -1; i--) { |
| var byte = buf[i] |
| if (byte !== 0) |
| sum += byte * Math.pow(256, len - i - 1) |
| } |
| return sum |
| } |
| |
| const onesComp = byte => (0xff ^ byte) & 0xff |
| |
| const twosComp = byte => ((0xff ^ byte) + 1) & 0xff |
| </pre></td></tr> |
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