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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| /* | ||
| * Copyright 2023 The Fury Authors | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
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| import { isNodeEnv } from "./util"; | ||
|
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| export interface PlatformBuffer extends Uint8Array { | ||
| latin1Slice(start: number, end: number): string, | ||
| utf8Slice(start: number, end: number): string, | ||
| latin1Write(v: string, offset: number): void, | ||
| utf8Write(v: string, offset: number): void, | ||
| copy(target: Uint8Array, targetStart?: number, sourceStart?: number, sourceEnd?: number): Uint8Array | ||
| } | ||
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| class BrowserBuffer extends Uint8Array { | ||
| static alloc(size: number) { | ||
| return new BrowserBuffer(new Uint8Array(size)); | ||
| } | ||
|
|
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| latin1Slice(start: number, end: number) { | ||
| if (end - start < 1) { | ||
| return ""; | ||
| } | ||
| let str = ""; | ||
| for (let i = start; i < end;) { | ||
| str += String.fromCharCode(this[i++]); | ||
| } | ||
| return str; | ||
| } | ||
|
|
||
| utf8Slice(start: number, end: number) { | ||
| if (end - start < 1) { | ||
| return ""; | ||
| } | ||
| let str = ""; | ||
| for (let i = start; i < end;) { | ||
| const t = this[i++]; | ||
| if (t <= 0x7F) { | ||
| str += String.fromCharCode(t); | ||
| } else if (t >= 0xC0 && t < 0xE0) { | ||
| str += String.fromCharCode((t & 0x1F) << 6 | this[i++] & 0x3F); | ||
| } else if (t >= 0xE0 && t < 0xF0) { | ||
| str += String.fromCharCode((t & 0xF) << 12 | (this[i++] & 0x3F) << 6 | this[i++] & 0x3F); | ||
| } else if (t >= 0xF0) { | ||
| const t2 = ((t & 7) << 18 | (this[i++] & 0x3F) << 12 | (this[i++] & 0x3F) << 6 | this[i++] & 0x3F) - 0x10000; | ||
| str += String.fromCharCode(0xD800 + (t2 >> 10)); | ||
| str += String.fromCharCode(0xDC00 + (t2 & 0x3FF)); | ||
| } | ||
| } | ||
|
|
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| return str; | ||
| } | ||
|
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| copy(target: Uint8Array, targetStart?: number, sourceStart?: number, sourceEnd?: number) { | ||
| target.set(this.subarray(sourceStart, sourceEnd), targetStart); | ||
| } | ||
| } | ||
|
|
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| export function fromString(str: string) { | ||
| if (isNodeEnv) { | ||
| return Buffer.from(str); | ||
| } else { | ||
| return new BrowserBuffer(new TextEncoder().encode(str)) | ||
| } | ||
| } | ||
|
|
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| export function fromUint8Array(ab: Buffer | Uint8Array): PlatformBuffer { | ||
| if (isNodeEnv) { | ||
| if (!Buffer.isBuffer(ab)) { | ||
| return (Buffer.from(ab) as unknown as PlatformBuffer) | ||
| } else { | ||
| return ab as unknown as PlatformBuffer; | ||
| } | ||
| } else { | ||
| const result = new BrowserBuffer(ab); | ||
| return result as unknown as PlatformBuffer; | ||
| } | ||
| } | ||
|
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| export function alloc(size: number): PlatformBuffer { | ||
| if (isNodeEnv) { | ||
| return Buffer.allocUnsafe(size) as unknown as PlatformBuffer; | ||
| } else { | ||
| const result = BrowserBuffer.alloc(size); | ||
| return result as PlatformBuffer; | ||
| } | ||
| } | ||
|
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|
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| export function strByteLength(str: string): number { | ||
| if (isNodeEnv) { | ||
| return Buffer.byteLength(str); | ||
| } else { | ||
| let len = 0; | ||
| let c = 0; | ||
| for (let i = 0; i < str.length; ++i) { | ||
| c = str.charCodeAt(i); | ||
| if (c < 128) | ||
| len += 1; | ||
| else if (c < 2048) | ||
| len += 2; | ||
| else if ((c & 0xFC00) === 0xD800 && (str.charCodeAt(i + 1) & 0xFC00) === 0xDC00) { | ||
| ++i; | ||
| len += 4; | ||
| } else | ||
| len += 3; | ||
| } | ||
| return len; | ||
| } | ||
| } |
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