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Merged
streamich merged 2 commits into from
Aug 1, 2025
Merged

Buffers #13

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cde2106
fix: 🐛 upstream buffers library
streamich Aug 1, 2025
627923e
test: 💍 remove unused tests
streamich Aug 1, 2025
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4 changes: 3 additions & 1 deletion package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -57,7 +57,9 @@
"peerDependencies": {
"tslib": "2"
},
"dependencies": {},
"dependencies": {
"@jsonjoy.com/buffers": "^1.0.0"
},
"devDependencies": {
"@types/benchmark": "^2.1.2",
"@types/jest": "^29.5.12",
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116 changes: 1 addition & 115 deletions src/buffers/Reader.ts
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@@ -1,115 +1 @@
import {decodeUtf8} from './utf8/decodeUtf8';
import type {IReader, IReaderResettable} from './types';

export class Reader implements IReader, IReaderResettable {
public uint8 = new Uint8Array([]);
public view = new DataView(this.uint8.buffer);
public x = 0;

public reset(uint8: Uint8Array): void {
this.x = 0;
this.uint8 = uint8;
this.view = new DataView(uint8.buffer, uint8.byteOffset, uint8.length);
}

/**
* Get current byte value without advancing the cursor.
*/
public peek(): number {
return this.view.getUint8(this.x);
}

/**
* @deprecated Use peek() instead.
*/
public peak(): number {
return this.peek();
}

public skip(length: number): void {
this.x += length;
}

public buf(size: number): Uint8Array {
const end = this.x + size;
const bin = this.uint8.subarray(this.x, end);
this.x = end;
return bin;
}

public u8(): number {
return this.uint8[this.x++];
// return this.view.getUint8(this.x++);
}

public i8(): number {
return this.view.getInt8(this.x++);
}

public u16(): number {
// const num = this.view.getUint16(this.x);
// this.x += 2;
// return num;
let x = this.x;
const num = (this.uint8[x++] << 8) + this.uint8[x++];
this.x = x;
return num;
}

public i16(): number {
const num = this.view.getInt16(this.x);
this.x += 2;
return num;
}

public u32(): number {
const num = this.view.getUint32(this.x);
this.x += 4;
return num;
}

public i32(): number {
const num = this.view.getInt32(this.x);
this.x += 4;
return num;
}

public u64(): bigint {
const num = this.view.getBigUint64(this.x);
this.x += 8;
return num;
}

public i64(): bigint {
const num = this.view.getBigInt64(this.x);
this.x += 8;
return num;
}

public f32(): number {
const pos = this.x;
this.x += 4;
return this.view.getFloat32(pos);
}

public f64(): number {
const pos = this.x;
this.x += 8;
return this.view.getFloat64(pos);
}

public utf8(size: number): string {
const start = this.x;
this.x += size;
return decodeUtf8(this.uint8, start, size);
}

public ascii(length: number): string {
const uint8 = this.uint8;
let str = '';
const end = this.x + length;
for (let i = this.x; i < end; i++) str += String.fromCharCode(uint8[i]);
this.x = end;
return str;
}
}
export * from '@jsonjoy.com/buffers/lib/Reader';
13 changes: 1 addition & 12 deletions src/buffers/Slice.ts
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@@ -1,12 +1 @@
export class Slice {
constructor(
public readonly uint8: Uint8Array,
public readonly view: DataView,
public readonly start: number,
public readonly end: number,
) {}

public subarray(): Uint8Array {
return this.uint8.subarray(this.start, this.end);
}
}
export * from '@jsonjoy.com/buffers/lib/Slice';
184 changes: 1 addition & 183 deletions src/buffers/StreamingOctetReader.ts
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@@ -1,183 +1 @@
const fromCharCode = String.fromCharCode;

export class StreamingOctetReader {
protected readonly chunks: Uint8Array[] = [];

/** Total size of all chunks. */
protected chunkSize: number = 0;

protected x: number = 0;

public size(): number {
return this.chunkSize - this.x;
}

public push(chunk: Uint8Array): void {
this.chunks.push(chunk);
this.chunkSize += chunk.length;
}

protected assertSize(size: number): void {
if (size > this.size()) throw new RangeError('OUT_OF_BOUNDS');
}

public u8(): number {
this.assertSize(1);
const chunk = this.chunks[0]!;
let x = this.x;
const octet = chunk[x++];
if (x === chunk.length) {
this.chunks.shift();
this.chunkSize -= chunk.length;
x = 0;
}
this.x = x;
return octet;
}

public u32(): number {
const octet0 = this.u8();
const octet1 = this.u8();
const octet2 = this.u8();
const octet3 = this.u8();
return (octet0 * 0x1000000 + (octet1 << 16) + (octet2 << 8)) | octet3;
}

public copy(size: number, dst: Uint8Array, pos: number): void {
if (!size) return;
this.assertSize(size);
const chunk0 = this.chunks[0]!;
const size0 = Math.min(chunk0.length - this.x, size);
dst.set(chunk0.subarray(this.x, this.x + size0), pos);
size -= size0;
if (size <= 0) {
this.skipUnsafe(size0);
return;
}
let chunkIndex = 1;
while (size > 0) {
const chunk1 = this.chunks[chunkIndex]!;
const size1 = Math.min(chunk1.length, size);
dst.set(chunk1.subarray(0, size1), pos + size0);
size -= size1;
chunkIndex++;
}
this.skipUnsafe(size);
}

public copyXor(
size: number,
dst: Uint8Array,
pos: number,
mask: [number, number, number, number],
maskIndex: number,
): void {
if (!size) return;
this.assertSize(size);
const chunk0 = this.chunks[0]!;
let x = this.x;
const size0 = Math.min(chunk0.length - x, size);
const end = x + size0;
for (; x < end; ) dst[pos++] = chunk0[x++] ^ mask[maskIndex++ % 4];
size -= size0;
if (size <= 0) {
this.skipUnsafe(size0);
return;
}
let chunkIndex = 1;
while (size > 0) {
const chunk1 = this.chunks[chunkIndex++]!;
const size1 = Math.min(chunk1.length, size);
for (let x = 0; x < size1; ) dst[pos++] = chunk1[x++] ^ mask[maskIndex++ % 4];
size -= size1;
}
this.skipUnsafe(size);
}

public buf(size: number): Uint8Array {
this.assertSize(size);
const buf = new Uint8Array(size);
this.copy(size, buf, 0);
return buf;
}

public bufXor(size: number, mask: [number, number, number, number], maskIndex: number): Uint8Array {
this.assertSize(size);
const buf = new Uint8Array(size);
this.copyXor(size, buf, 0, mask, maskIndex);
return buf;
}

public skipUnsafe(n: number): void {
if (!n) return;
const chunk = this.chunks[0]!;
const chunkLength = chunk.length;
const remaining = chunkLength - this.x;
if (remaining > n) {
this.x = this.x + n;
return;
}
this.x = 0;
this.chunks.shift();
this.chunkSize -= chunkLength;
n -= remaining;
this.skipUnsafe(n);
}

public skip(n: number): void {
this.assertSize(n);
this.skipUnsafe(n);
}

public peek(): number {
this.assertSize(1);
return this.chunks[0]![this.x];
}

/**
* Get current byte value without advancing the cursor.
* @deprecated Use peek() instead.
*/
public peak(): number {
return this.peek();
}

public utf8(length: number, mask: [number, number, number, number], maskIndex: number): string {
this.assertSize(length);
let i = 0;
const points: number[] = [];
while (i < length) {
let code = this.u8() ^ mask[maskIndex++ % 4];
i++;
if ((code & 0x80) !== 0) {
const octet2 = (this.u8() ^ mask[maskIndex++ % 4]) & 0x3f;
i++;
if ((code & 0xe0) === 0xc0) {
code = ((code & 0x1f) << 6) | octet2;
} else {
const octet3 = (this.u8() ^ mask[maskIndex++ % 4]) & 0x3f;
i++;
if ((code & 0xf0) === 0xe0) {
code = ((code & 0x1f) << 12) | (octet2 << 6) | octet3;
} else {
if ((code & 0xf8) === 0xf0) {
const octet4 = (this.u8() ^ mask[maskIndex++ % 4]) & 0x3f;
i++;
let unit = ((code & 0x07) << 0x12) | (octet2 << 0x0c) | (octet3 << 0x06) | octet4;
if (unit > 0xffff) {
unit -= 0x10000;
const unit0 = ((unit >>> 10) & 0x3ff) | 0xd800;
code = 0xdc00 | (unit & 0x3ff);
points.push(unit0);
} else {
code = unit;
}
}
}
}
}
points.push(code);
}
return fromCharCode.apply(String, points);
}
}
export * from '@jsonjoy.com/buffers/lib/StreamingOctetReader';
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