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391a73c | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 | import { toUint8Array, toUint8ArrayCopy } from "./buffer-source.js";
function clampIndex(value, fallback, length) {
const normalized = Number.isFinite(value) ? Math.trunc(value) : fallback;
if (normalized <= 0) {
return 0;
}
if (normalized >= length) {
return length;
}
return normalized;
}
function normalizeForwardRange(length, options) {
const start = clampIndex(options?.start, 0, length);
const end = clampIndex(options?.end, length, length);
return end >= start ? [start, end] : [start, start];
}
function normalizeReverseRange(length, options) {
const start = clampIndex(options?.start, length, length);
const end = clampIndex(options?.end, 0, length);
return start >= end ? [end, start] : [start, start];
}
function normalizeSliceIndex(value, fallback, length) {
const normalized = Number.isFinite(value) ? Math.trunc(value) : fallback;
if (normalized < 0) {
return Math.max(length + normalized, 0);
}
if (normalized > length) {
return length;
}
return normalized;
}
function encodeAscii(text) {
const bytes = new Uint8Array(text.length);
for (let i = 0; i < text.length; i++) {
bytes[i] = text.charCodeAt(i) & 0xff;
}
return bytes;
}
function encodeUtf8(text) {
return new TextEncoder().encode(text);
}
function toPatternBytes(pattern, options) {
if (typeof pattern === "string") {
return options?.encoding === "utf8" ? encodeUtf8(pattern) : encodeAscii(pattern);
}
return toUint8Array(pattern);
}
function bytesEqualAt(data, pattern, offset) {
for (let index = 0; index < pattern.byteLength; index++) {
if (data[offset + index] !== pattern[index]) {
return false;
}
}
return true;
}
export function indexOf(data, pattern, options) {
const bytes = toUint8Array(data);
const needle = toPatternBytes(pattern, options);
const [start, end] = normalizeForwardRange(bytes.byteLength, options);
if (needle.byteLength === 0) {
return start;
}
const lastOffset = end - needle.byteLength;
if (lastOffset < start) {
return -1;
}
for (let offset = start; offset <= lastOffset; offset++) {
if (bytesEqualAt(bytes, needle, offset)) {
return offset;
}
}
return -1;
}
export function lastIndexOf(data, pattern, options) {
const bytes = toUint8Array(data);
const needle = toPatternBytes(pattern, options);
const [end, start] = normalizeReverseRange(bytes.byteLength, options);
if (needle.byteLength === 0) {
return start;
}
const firstOffset = start - needle.byteLength;
if (firstOffset < end) {
return -1;
}
for (let offset = firstOffset; offset >= end; offset--) {
if (bytesEqualAt(bytes, needle, offset)) {
return offset;
}
}
return -1;
}
export function includes(data, pattern, options) {
return indexOf(data, pattern, options) !== -1;
}
export function startsWith(data, pattern, options) {
const bytes = toUint8Array(data);
const needle = toPatternBytes(pattern, options);
if (needle.byteLength > bytes.byteLength) {
return false;
}
return bytesEqualAt(bytes, needle, 0);
}
export function endsWith(data, pattern, options) {
const bytes = toUint8Array(data);
const needle = toPatternBytes(pattern, options);
if (needle.byteLength > bytes.byteLength) {
return false;
}
return bytesEqualAt(bytes, needle, bytes.byteLength - needle.byteLength);
}
export function slice(data, start, end) {
const bytes = toUint8Array(data);
const normalizedStart = normalizeSliceIndex(start, 0, bytes.byteLength);
const normalizedEnd = normalizeSliceIndex(end, bytes.byteLength, bytes.byteLength);
if (normalizedEnd <= normalizedStart) {
return bytes.subarray(normalizedStart, normalizedStart);
}
return bytes.subarray(normalizedStart, normalizedEnd);
}
export function tail(data, length) {
const bytes = toUint8Array(data);
const normalizedLength = Number.isFinite(length) ? Math.max(0, Math.trunc(length)) : 0;
if (normalizedLength >= bytes.byteLength) {
return bytes;
}
return bytes.subarray(bytes.byteLength - normalizedLength);
}
export function copy(data) {
return toUint8ArrayCopy(data);
}
export function compare(a, b) {
const left = toUint8Array(a);
const right = toUint8Array(b);
const limit = Math.min(left.byteLength, right.byteLength);
for (let index = 0; index < limit; index++) {
if (left[index] < right[index]) {
return -1;
}
if (left[index] > right[index]) {
return 1;
}
}
if (left.byteLength < right.byteLength) {
return -1;
}
if (left.byteLength > right.byteLength) {
return 1;
}
return 0;
}
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