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140 lines
3.4 KiB
TypeScript
140 lines
3.4 KiB
TypeScript
// Loaded from https://deno.land/std@0.78.0/encoding/_yaml/type/binary.ts
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// Ported from js-yaml v3.13.1:
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// Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
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// https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import { Type } from "../type.ts";
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import type { Any } from "../utils.ts";
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// [ 64, 65, 66 ] -> [ padding, CR, LF ]
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const BASE64_MAP =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n\r";
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function resolveYamlBinary(data: Any): boolean {
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if (data === null) return false;
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let code: number;
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let bitlen = 0;
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const max = data.length;
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const map = BASE64_MAP;
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// Convert one by one.
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for (let idx = 0; idx < max; idx++) {
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code = map.indexOf(data.charAt(idx));
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// Skip CR/LF
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if (code > 64) continue;
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// Fail on illegal characters
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if (code < 0) return false;
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bitlen += 6;
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}
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// If there are any bits left, source was corrupted
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return bitlen % 8 === 0;
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}
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function constructYamlBinary(data: string): Deno.Buffer {
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// remove CR/LF & padding to simplify scan
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const input = data.replace(/[\r\n=]/g, "");
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const max = input.length;
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const map = BASE64_MAP;
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// Collect by 6*4 bits (3 bytes)
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const result = [];
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let bits = 0;
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for (let idx = 0; idx < max; idx++) {
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if (idx % 4 === 0 && idx) {
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result.push((bits >> 16) & 0xff);
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result.push((bits >> 8) & 0xff);
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result.push(bits & 0xff);
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}
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bits = (bits << 6) | map.indexOf(input.charAt(idx));
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}
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// Dump tail
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const tailbits = (max % 4) * 6;
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if (tailbits === 0) {
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result.push((bits >> 16) & 0xff);
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result.push((bits >> 8) & 0xff);
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result.push(bits & 0xff);
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} else if (tailbits === 18) {
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result.push((bits >> 10) & 0xff);
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result.push((bits >> 2) & 0xff);
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} else if (tailbits === 12) {
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result.push((bits >> 4) & 0xff);
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}
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return new Deno.Buffer(new Uint8Array(result));
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}
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function representYamlBinary(object: Uint8Array): string {
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const max = object.length;
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const map = BASE64_MAP;
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// Convert every three bytes to 4 ASCII characters.
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let result = "";
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let bits = 0;
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for (let idx = 0; idx < max; idx++) {
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if (idx % 3 === 0 && idx) {
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result += map[(bits >> 18) & 0x3f];
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result += map[(bits >> 12) & 0x3f];
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result += map[(bits >> 6) & 0x3f];
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result += map[bits & 0x3f];
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}
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bits = (bits << 8) + object[idx];
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}
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// Dump tail
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const tail = max % 3;
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if (tail === 0) {
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result += map[(bits >> 18) & 0x3f];
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result += map[(bits >> 12) & 0x3f];
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result += map[(bits >> 6) & 0x3f];
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result += map[bits & 0x3f];
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} else if (tail === 2) {
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result += map[(bits >> 10) & 0x3f];
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result += map[(bits >> 4) & 0x3f];
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result += map[(bits << 2) & 0x3f];
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result += map[64];
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} else if (tail === 1) {
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result += map[(bits >> 2) & 0x3f];
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result += map[(bits << 4) & 0x3f];
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result += map[64];
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result += map[64];
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}
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return result;
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}
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function isBinary(obj: Any): obj is Deno.Buffer {
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const buf = new Deno.Buffer();
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try {
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if (0 > buf.readFromSync(obj as Deno.Buffer)) return true;
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return false;
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} catch {
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return false;
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} finally {
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buf.reset();
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}
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}
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export const binary = new Type("tag:yaml.org,2002:binary", {
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construct: constructYamlBinary,
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kind: "scalar",
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predicate: isBinary,
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represent: representYamlBinary,
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resolve: resolveYamlBinary,
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});
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