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d-yokoi 2019-03-03 23:07:49 +09:00
parent c74ab67ccf
commit 03632f1507
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24 changed files with 2321 additions and 1958 deletions

57
ts_src/bufferutils.ts
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@ -1,37 +1,44 @@
// https://github.com/feross/buffer/blob/master/index.js#L1127
function verifuint (value: number, max: number): void {
if (typeof value !== 'number') throw new Error('cannot write a non-number as a number')
if (value < 0) throw new Error('specified a negative value for writing an unsigned value')
if (value > max) throw new Error('RangeError: value out of range')
if (Math.floor(value) !== value) throw new Error('value has a fractional component')
function verifuint(value: number, max: number): void {
if (typeof value !== 'number')
throw new Error('cannot write a non-number as a number');
if (value < 0)
throw new Error('specified a negative value for writing an unsigned value');
if (value > max) throw new Error('RangeError: value out of range');
if (Math.floor(value) !== value)
throw new Error('value has a fractional component');
}
export function readUInt64LE (buffer: Buffer, offset: number): number {
const a = buffer.readUInt32LE(offset)
let b = buffer.readUInt32LE(offset + 4)
b *= 0x100000000
export function readUInt64LE(buffer: Buffer, offset: number): number {
const a = buffer.readUInt32LE(offset);
let b = buffer.readUInt32LE(offset + 4);
b *= 0x100000000;
verifuint(b + a, 0x001fffffffffffff)
return b + a
verifuint(b + a, 0x001fffffffffffff);
return b + a;
}
export function writeUInt64LE (buffer: Buffer, value: number, offset: number): number {
verifuint(value, 0x001fffffffffffff)
export function writeUInt64LE(
buffer: Buffer,
value: number,
offset: number,
): number {
verifuint(value, 0x001fffffffffffff);
buffer.writeInt32LE(value & -1, offset)
buffer.writeUInt32LE(Math.floor(value / 0x100000000), offset + 4)
return offset + 8
buffer.writeInt32LE(value & -1, offset);
buffer.writeUInt32LE(Math.floor(value / 0x100000000), offset + 4);
return offset + 8;
}
export function reverseBuffer (buffer: Buffer): Buffer {
if (buffer.length < 1) return buffer
let j = buffer.length - 1
let tmp = 0
export function reverseBuffer(buffer: Buffer): Buffer {
if (buffer.length < 1) return buffer;
let j = buffer.length - 1;
let tmp = 0;
for (let i = 0; i < buffer.length / 2; i++) {
tmp = buffer[i]
buffer[i] = buffer[j]
buffer[j] = tmp
j--
tmp = buffer[i];
buffer[i] = buffer[j];
buffer[j] = tmp;
j--;
}
return buffer
return buffer;
}