mirror of
https://github.com/denoland/deno.git
synced 2024-12-25 08:39:09 -05:00
417 lines
10 KiB
TypeScript
417 lines
10 KiB
TypeScript
/**
|
||
* See also https://nodejs.org/api/buffer.html
|
||
*/
|
||
export default class Buffer extends Uint8Array {
|
||
/**
|
||
* Allocates a new Buffer of size bytes.
|
||
*/
|
||
static alloc(size: number): Buffer {
|
||
return new Buffer(size);
|
||
}
|
||
|
||
/**
|
||
* Returns the byte length of a string when encoded. This is not the same as
|
||
* String.prototype.length, which does not account for the encoding that is
|
||
* used to convert the string into bytes.
|
||
*/
|
||
static byteLength(
|
||
string: string | Buffer | ArrayBufferView | ArrayBuffer | SharedArrayBuffer
|
||
): number {
|
||
if (typeof string != "string") return string.byteLength;
|
||
return new TextEncoder().encode(string).length;
|
||
}
|
||
|
||
/**
|
||
* Returns a new Buffer which is the result of concatenating all the Buffer
|
||
* instances in the list together.
|
||
*/
|
||
static concat(list: Buffer[] | Uint8Array[], totalLength?: number): Buffer {
|
||
if (totalLength == undefined) {
|
||
totalLength = 0;
|
||
for (const buf of list) {
|
||
totalLength += buf.length;
|
||
}
|
||
}
|
||
|
||
const buffer = new Buffer(totalLength);
|
||
let pos = 0;
|
||
for (const buf of list) {
|
||
buffer.set(buf, pos);
|
||
pos += buf.length;
|
||
}
|
||
|
||
return buffer;
|
||
}
|
||
|
||
/**
|
||
* Allocates a new Buffer using an array of bytes in the range 0 – 255. Array
|
||
* entries outside that range will be truncated to fit into it.
|
||
*/
|
||
static from(array: number[]): Buffer;
|
||
/**
|
||
* This creates a view of the ArrayBuffer without copying the underlying
|
||
* memory. For example, when passed a reference to the .buffer property of a
|
||
* TypedArray instance, the newly created Buffer will share the same allocated
|
||
* memory as the TypedArray.
|
||
*/
|
||
static from(
|
||
arrayBuffer: ArrayBuffer | SharedArrayBuffer,
|
||
byteOffset?: number,
|
||
length?: number
|
||
): Buffer;
|
||
/**
|
||
* Copies the passed buffer data onto a new Buffer instance.
|
||
*/
|
||
static from(buffer: Buffer | Uint8Array): Buffer;
|
||
/**
|
||
* Creates a new Buffer containing string.
|
||
*/
|
||
static from(string: string): Buffer;
|
||
// eslint-disable-next-line @typescript-eslint/no-explicit-any
|
||
static from(value: any, offset?: number, length?: number): Buffer {
|
||
if (typeof value == "string")
|
||
return new Buffer(new TextEncoder().encode(value).buffer);
|
||
|
||
// workaround for https://github.com/microsoft/TypeScript/issues/38446
|
||
return new Buffer(value, offset!, length);
|
||
}
|
||
|
||
/**
|
||
* Returns true if obj is a Buffer, false otherwise.
|
||
*/
|
||
static isBuffer(obj: object): obj is Buffer {
|
||
return obj instanceof Buffer;
|
||
}
|
||
|
||
/**
|
||
* Copies data from a region of buf to a region in target, even if the target
|
||
* memory region overlaps with buf.
|
||
*/
|
||
copy(
|
||
targetBuffer: Buffer | Uint8Array,
|
||
targetStart = 0,
|
||
sourceStart = 0,
|
||
sourceEnd = this.length
|
||
): number {
|
||
const sourceBuffer = this.subarray(sourceStart, sourceEnd);
|
||
targetBuffer.set(sourceBuffer, targetStart);
|
||
return sourceBuffer.length;
|
||
}
|
||
|
||
readBigInt64BE(offset = 0): bigint {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength
|
||
).getBigInt64(offset);
|
||
}
|
||
readBigInt64LE(offset = 0): bigint {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength
|
||
).getBigInt64(offset, true);
|
||
}
|
||
|
||
readBigUInt64BE(offset = 0): bigint {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength
|
||
).getBigUint64(offset);
|
||
}
|
||
readBigUInt64LE(offset = 0): bigint {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength
|
||
).getBigUint64(offset, true);
|
||
}
|
||
|
||
readDoubleBE(offset = 0): number {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength
|
||
).getFloat64(offset);
|
||
}
|
||
readDoubleLE(offset = 0): number {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength
|
||
).getFloat64(offset, true);
|
||
}
|
||
|
||
readFloatBE(offset = 0): number {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength
|
||
).getFloat32(offset);
|
||
}
|
||
readFloatLE(offset = 0): number {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength
|
||
).getFloat32(offset, true);
|
||
}
|
||
|
||
readInt8(offset = 0): number {
|
||
return new DataView(this.buffer, this.byteOffset, this.byteLength).getInt8(
|
||
offset
|
||
);
|
||
}
|
||
|
||
readInt16BE(offset = 0): number {
|
||
return new DataView(this.buffer, this.byteOffset, this.byteLength).getInt16(
|
||
offset
|
||
);
|
||
}
|
||
readInt16LE(offset = 0): number {
|
||
return new DataView(this.buffer, this.byteOffset, this.byteLength).getInt16(
|
||
offset,
|
||
true
|
||
);
|
||
}
|
||
|
||
readInt32BE(offset = 0): number {
|
||
return new DataView(this.buffer, this.byteOffset, this.byteLength).getInt32(
|
||
offset
|
||
);
|
||
}
|
||
readInt32LE(offset = 0): number {
|
||
return new DataView(this.buffer, this.byteOffset, this.byteLength).getInt32(
|
||
offset,
|
||
true
|
||
);
|
||
}
|
||
|
||
readUInt8(offset = 0): number {
|
||
return new DataView(this.buffer, this.byteOffset, this.byteLength).getUint8(
|
||
offset
|
||
);
|
||
}
|
||
|
||
readUInt16BE(offset = 0): number {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength
|
||
).getUint16(offset);
|
||
}
|
||
readUInt16LE(offset = 0): number {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength
|
||
).getUint16(offset, true);
|
||
}
|
||
|
||
readUInt32BE(offset = 0): number {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength
|
||
).getUint32(offset);
|
||
}
|
||
readUInt32LE(offset = 0): number {
|
||
return new DataView(
|
||
this.buffer,
|
||
this.byteOffset,
|
||
this.byteLength
|
||
).getUint32(offset, true);
|
||
}
|
||
|
||
/**
|
||
* Returns a new Buffer that references the same memory as the original, but
|
||
* offset and cropped by the start and end indices.
|
||
*/
|
||
slice(begin = 0, end = this.length): Buffer {
|
||
// workaround for https://github.com/microsoft/TypeScript/issues/38665
|
||
return this.subarray(begin, end) as Buffer;
|
||
}
|
||
|
||
/**
|
||
* Returns a JSON representation of buf. JSON.stringify() implicitly calls
|
||
* this function when stringifying a Buffer instance.
|
||
*/
|
||
toJSON(): object {
|
||
return { type: "Buffer", data: Array.from(this) };
|
||
}
|
||
|
||
/**
|
||
* Decodes buf to a string according to the specified character encoding in
|
||
* encoding. start and end may be passed to decode only a subset of buf.
|
||
*/
|
||
toString(encoding = "utf8", start = 0, end = this.length): string {
|
||
return new TextDecoder(encoding).decode(this.subarray(start, end));
|
||
}
|
||
|
||
/**
|
||
* Writes string to buf at offset according to the character encoding in
|
||
* encoding. The length parameter is the number of bytes to write. If buf did
|
||
* not contain enough space to fit the entire string, only part of string will
|
||
* be written. However, partially encoded characters will not be written.
|
||
*/
|
||
write(string: string, offset = 0, length = this.length): number {
|
||
return new TextEncoder().encodeInto(
|
||
string,
|
||
this.subarray(offset, offset + length)
|
||
).written;
|
||
}
|
||
|
||
writeBigInt64BE(value: bigint, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setBigInt64(
|
||
offset,
|
||
value
|
||
);
|
||
return offset + 4;
|
||
}
|
||
writeBigInt64LE(value: bigint, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setBigInt64(
|
||
offset,
|
||
value,
|
||
true
|
||
);
|
||
return offset + 4;
|
||
}
|
||
|
||
writeBigUInt64BE(value: bigint, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setBigUint64(
|
||
offset,
|
||
value
|
||
);
|
||
return offset + 4;
|
||
}
|
||
writeBigUInt64LE(value: bigint, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setBigUint64(
|
||
offset,
|
||
value,
|
||
true
|
||
);
|
||
return offset + 4;
|
||
}
|
||
|
||
writeDoubleBE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setFloat64(
|
||
offset,
|
||
value
|
||
);
|
||
return offset + 8;
|
||
}
|
||
writeDoubleLE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setFloat64(
|
||
offset,
|
||
value,
|
||
true
|
||
);
|
||
return offset + 8;
|
||
}
|
||
|
||
writeFloatBE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setFloat32(
|
||
offset,
|
||
value
|
||
);
|
||
return offset + 4;
|
||
}
|
||
writeFloatLE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setFloat32(
|
||
offset,
|
||
value,
|
||
true
|
||
);
|
||
return offset + 4;
|
||
}
|
||
|
||
writeInt8(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setInt8(
|
||
offset,
|
||
value
|
||
);
|
||
return offset + 1;
|
||
}
|
||
|
||
writeInt16BE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setInt16(
|
||
offset,
|
||
value
|
||
);
|
||
return offset + 2;
|
||
}
|
||
writeInt16LE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setInt16(
|
||
offset,
|
||
value,
|
||
true
|
||
);
|
||
return offset + 2;
|
||
}
|
||
|
||
writeInt32BE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setUint32(
|
||
offset,
|
||
value
|
||
);
|
||
return offset + 4;
|
||
}
|
||
writeInt32LE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setInt32(
|
||
offset,
|
||
value,
|
||
true
|
||
);
|
||
return offset + 4;
|
||
}
|
||
|
||
writeUInt8(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setUint8(
|
||
offset,
|
||
value
|
||
);
|
||
return offset + 1;
|
||
}
|
||
|
||
writeUInt16BE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setUint16(
|
||
offset,
|
||
value
|
||
);
|
||
return offset + 2;
|
||
}
|
||
writeUInt16LE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setUint16(
|
||
offset,
|
||
value,
|
||
true
|
||
);
|
||
return offset + 2;
|
||
}
|
||
|
||
writeUInt32BE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setUint32(
|
||
offset,
|
||
value
|
||
);
|
||
return offset + 4;
|
||
}
|
||
writeUInt32LE(value: number, offset = 0): number {
|
||
new DataView(this.buffer, this.byteOffset, this.byteLength).setUint32(
|
||
offset,
|
||
value,
|
||
true
|
||
);
|
||
return offset + 4;
|
||
}
|
||
}
|
||
|
||
export { Buffer };
|
||
|
||
Object.defineProperty(globalThis, "Buffer", {
|
||
value: Buffer,
|
||
enumerable: false,
|
||
writable: true,
|
||
configurable: true,
|
||
});
|