// Ported from js-yaml v3.13.1:
// Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
// https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
// Copyright 2018-2026 the Deno authors. MIT license.
import type { Type } from "../_type.ts";
// [ 64, 65, 66 ] -> [ padding, CR, LF ]
const BASE64_MAP =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n\r";
function resolveYamlBinary(data: string): boolean {
if (data === null) return false;
let code: number;
let bitlen = 0;
const max = data.length;
const map = BASE64_MAP;
// Convert one by one.
for (let idx = 0; idx < max; idx++) {
code = map.indexOf(data.charAt(idx));
// Skip CR/LF
if (code > 64) continue;
// Fail on illegal characters
if (code < 0) return false;
bitlen += 6;
}
// If there are any bits left, source was corrupted
return bitlen % 8 === 0;
}
function constructYamlBinary(data: string): Uint8Array {
// remove CR/LF & padding to simplify scan
const input = data.replace(/[\r\n=]/g, "");
const max = input.length;
const map = BASE64_MAP;
// Collect by 6*4 bits (3 bytes)
const result = [];
let bits = 0;
for (let idx = 0; idx < max; idx++) {
if (idx % 4 === 0 && idx) {
result.push((bits >> 16) & 0xff);
result.push((bits >> 8) & 0xff);
result.push(bits & 0xff);
}
bits = (bits << 6) | map.indexOf(input.charAt(idx));
}
// Dump tail
const tailbits = (max % 4) * 6;
if (tailbits === 0) {
result.push((bits >> 16) & 0xff);
result.push((bits >> 8) & 0xff);
result.push(bits & 0xff);
} else if (tailbits === 18) {
result.push((bits >> 10) & 0xff);
result.push((bits >> 2) & 0xff);
} else if (tailbits === 12) {
result.push((bits >> 4) & 0xff);
}
return new Uint8Array(result);
}
function representYamlBinary(object: Uint8Array): string {
const max = object.length;
const map = BASE64_MAP;
// Convert every three bytes to 4 ASCII characters.
let result = "";
let bits = 0;
for (let idx = 0; idx < max; idx++) {
if (idx % 3 === 0 && idx) {
result += map[(bits >> 18) & 0x3f];
result += map[(bits >> 12) & 0x3f];
result += map[(bits >> 6) & 0x3f];
result += map[bits & 0x3f];
}
bits = (bits << 8) + object[idx]!;
}
// Dump tail
const tail = max % 3;
if (tail === 0) {
result += map[(bits >> 18) & 0x3f];
result += map[(bits >> 12) & 0x3f];
result += map[(bits >> 6) & 0x3f];
result += map[bits & 0x3f];
} else if (tail === 2) {
result += map[(bits >> 10) & 0x3f];
result += map[(bits >> 4) & 0x3f];
result += map[(bits << 2) & 0x3f];
result += map[64];
} else if (tail === 1) {
result += map[(bits >> 2) & 0x3f];
result += map[(bits << 4) & 0x3f];
result += map[64];
result += map[64];
}
return result;
}
function isBinary(obj: unknown): obj is Uint8Array {
return obj instanceof Uint8Array;
}
export const binary: Type<"scalar", Uint8Array> = {
tag: "tag:yaml.org,2002:binary",
construct: constructYamlBinary,
kind: "scalar",
predicate: isBinary,
represent: representYamlBinary,
resolve: resolveYamlBinary,
};
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