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Просмотр файла: binary.js
"use strict";
// Copyright (C) 2016 Dmitry Chestnykh
// MIT License. See LICENSE file for details.
Object.defineProperty(exports, "__esModule", { value: true });
/**
* Package binary provides functions for encoding and decoding numbers in byte arrays.
*/
var int_1 = require("@stablelib/int");
// TODO(dchest): add asserts for correct value ranges and array offsets.
/**
* Reads 2 bytes from array starting at offset as big-endian
* signed 16-bit integer and returns it.
*/
function readInt16BE(array, offset) {
if (offset === void 0) { offset = 0; }
return (((array[offset + 0] << 8) | array[offset + 1]) << 16) >> 16;
}
exports.readInt16BE = readInt16BE;
/**
* Reads 2 bytes from array starting at offset as big-endian
* unsigned 16-bit integer and returns it.
*/
function readUint16BE(array, offset) {
if (offset === void 0) { offset = 0; }
return ((array[offset + 0] << 8) | array[offset + 1]) >>> 0;
}
exports.readUint16BE = readUint16BE;
/**
* Reads 2 bytes from array starting at offset as little-endian
* signed 16-bit integer and returns it.
*/
function readInt16LE(array, offset) {
if (offset === void 0) { offset = 0; }
return (((array[offset + 1] << 8) | array[offset]) << 16) >> 16;
}
exports.readInt16LE = readInt16LE;
/**
* Reads 2 bytes from array starting at offset as little-endian
* unsigned 16-bit integer and returns it.
*/
function readUint16LE(array, offset) {
if (offset === void 0) { offset = 0; }
return ((array[offset + 1] << 8) | array[offset]) >>> 0;
}
exports.readUint16LE = readUint16LE;
/**
* Writes 2-byte big-endian representation of 16-bit unsigned
* value to byte array starting at offset.
*
* If byte array is not given, creates a new 2-byte one.
*
* Returns the output byte array.
*/
function writeUint16BE(value, out, offset) {
if (out === void 0) { out = new Uint8Array(2); }
if (offset === void 0) { offset = 0; }
out[offset + 0] = value >>> 8;
out[offset + 1] = value >>> 0;
return out;
}
exports.writeUint16BE = writeUint16BE;
exports.writeInt16BE = writeUint16BE;
/**
* Writes 2-byte little-endian representation of 16-bit unsigned
* value to array starting at offset.
*
* If byte array is not given, creates a new 2-byte one.
*
* Returns the output byte array.
*/
function writeUint16LE(value, out, offset) {
if (out === void 0) { out = new Uint8Array(2); }
if (offset === void 0) { offset = 0; }
out[offset + 0] = value >>> 0;
out[offset + 1] = value >>> 8;
return out;
}
exports.writeUint16LE = writeUint16LE;
exports.writeInt16LE = writeUint16LE;
/**
* Reads 4 bytes from array starting at offset as big-endian
* signed 32-bit integer and returns it.
*/
function readInt32BE(array, offset) {
if (offset === void 0) { offset = 0; }
return (array[offset] << 24) |
(array[offset + 1] << 16) |
(array[offset + 2] << 8) |
array[offset + 3];
}
exports.readInt32BE = readInt32BE;
/**
* Reads 4 bytes from array starting at offset as big-endian
* unsigned 32-bit integer and returns it.
*/
function readUint32BE(array, offset) {
if (offset === void 0) { offset = 0; }
return ((array[offset] << 24) |
(array[offset + 1] << 16) |
(array[offset + 2] << 8) |
array[offset + 3]) >>> 0;
}
exports.readUint32BE = readUint32BE;
/**
* Reads 4 bytes from array starting at offset as little-endian
* signed 32-bit integer and returns it.
*/
function readInt32LE(array, offset) {
if (offset === void 0) { offset = 0; }
return (array[offset + 3] << 24) |
(array[offset + 2] << 16) |
(array[offset + 1] << 8) |
array[offset];
}
exports.readInt32LE = readInt32LE;
/**
* Reads 4 bytes from array starting at offset as little-endian
* unsigned 32-bit integer and returns it.
*/
function readUint32LE(array, offset) {
if (offset === void 0) { offset = 0; }
return ((array[offset + 3] << 24) |
(array[offset + 2] << 16) |
(array[offset + 1] << 8) |
array[offset]) >>> 0;
}
exports.readUint32LE = readUint32LE;
/**
* Writes 4-byte big-endian representation of 32-bit unsigned
* value to byte array starting at offset.
*
* If byte array is not given, creates a new 4-byte one.
*
* Returns the output byte array.
*/
function writeUint32BE(value, out, offset) {
if (out === void 0) { out = new Uint8Array(4); }
if (offset === void 0) { offset = 0; }
out[offset + 0] = value >>> 24;
out[offset + 1] = value >>> 16;
out[offset + 2] = value >>> 8;
out[offset + 3] = value >>> 0;
return out;
}
exports.writeUint32BE = writeUint32BE;
exports.writeInt32BE = writeUint32BE;
/**
* Writes 4-byte little-endian representation of 32-bit unsigned
* value to array starting at offset.
*
* If byte array is not given, creates a new 4-byte one.
*
* Returns the output byte array.
*/
function writeUint32LE(value, out, offset) {
if (out === void 0) { out = new Uint8Array(4); }
if (offset === void 0) { offset = 0; }
out[offset + 0] = value >>> 0;
out[offset + 1] = value >>> 8;
out[offset + 2] = value >>> 16;
out[offset + 3] = value >>> 24;
return out;
}
exports.writeUint32LE = writeUint32LE;
exports.writeInt32LE = writeUint32LE;
/**
* Reads 8 bytes from array starting at offset as big-endian
* signed 64-bit integer and returns it.
*
* IMPORTANT: due to JavaScript limitation, supports exact
* numbers in range -9007199254740991 to 9007199254740991.
* If the number stored in the byte array is outside this range,
* the result is not exact.
*/
function readInt64BE(array, offset) {
if (offset === void 0) { offset = 0; }
var hi = readInt32BE(array, offset);
var lo = readInt32BE(array, offset + 4);
return hi * 0x100000000 + lo - ((lo >> 31) * 0x100000000);
}
exports.readInt64BE = readInt64BE;
/**
* Reads 8 bytes from array starting at offset as big-endian
* unsigned 64-bit integer and returns it.
*
* IMPORTANT: due to JavaScript limitation, supports values up to 2^53-1.
*/
function readUint64BE(array, offset) {
if (offset === void 0) { offset = 0; }
var hi = readUint32BE(array, offset);
var lo = readUint32BE(array, offset + 4);
return hi * 0x100000000 + lo;
}
exports.readUint64BE = readUint64BE;
/**
* Reads 8 bytes from array starting at offset as little-endian
* signed 64-bit integer and returns it.
*
* IMPORTANT: due to JavaScript limitation, supports exact
* numbers in range -9007199254740991 to 9007199254740991.
* If the number stored in the byte array is outside this range,
* the result is not exact.
*/
function readInt64LE(array, offset) {
if (offset === void 0) { offset = 0; }
var lo = readInt32LE(array, offset);
var hi = readInt32LE(array, offset + 4);
return hi * 0x100000000 + lo - ((lo >> 31) * 0x100000000);
}
exports.readInt64LE = readInt64LE;
/**
* Reads 8 bytes from array starting at offset as little-endian
* unsigned 64-bit integer and returns it.
*
* IMPORTANT: due to JavaScript limitation, supports values up to 2^53-1.
*/
function readUint64LE(array, offset) {
if (offset === void 0) { offset = 0; }
var lo = readUint32LE(array, offset);
var hi = readUint32LE(array, offset + 4);
return hi * 0x100000000 + lo;
}
exports.readUint64LE = readUint64LE;
/**
* Writes 8-byte big-endian representation of 64-bit unsigned
* value to byte array starting at offset.
*
* Due to JavaScript limitation, supports values up to 2^53-1.
*
* If byte array is not given, creates a new 8-byte one.
*
* Returns the output byte array.
*/
function writeUint64BE(value, out, offset) {
if (out === void 0) { out = new Uint8Array(8); }
if (offset === void 0) { offset = 0; }
writeUint32BE(value / 0x100000000 >>> 0, out, offset);
writeUint32BE(value >>> 0, out, offset + 4);
return out;
}
exports.writeUint64BE = writeUint64BE;
exports.writeInt64BE = writeUint64BE;
/**
* Writes 8-byte little-endian representation of 64-bit unsigned
* value to byte array starting at offset.
*
* Due to JavaScript limitation, supports values up to 2^53-1.
*
* If byte array is not given, creates a new 8-byte one.
*
* Returns the output byte array.
*/
function writeUint64LE(value, out, offset) {
if (out === void 0) { out = new Uint8Array(8); }
if (offset === void 0) { offset = 0; }
writeUint32LE(value >>> 0, out, offset);
writeUint32LE(value / 0x100000000 >>> 0, out, offset + 4);
return out;
}
exports.writeUint64LE = writeUint64LE;
exports.writeInt64LE = writeUint64LE;
/**
* Reads bytes from array starting at offset as big-endian
* unsigned bitLen-bit integer and returns it.
*
* Supports bit lengths divisible by 8, up to 48.
*/
function readUintBE(bitLength, array, offset) {
if (offset === void 0) { offset = 0; }
// TODO(dchest): implement support for bitLengths non-divisible by 8
if (bitLength % 8 !== 0) {
throw new Error("readUintBE supports only bitLengths divisible by 8");
}
if (bitLength / 8 > array.length - offset) {
throw new Error("readUintBE: array is too short for the given bitLength");
}
var result = 0;
var mul = 1;
for (var i = bitLength / 8 + offset - 1; i >= offset; i--) {
result += array[i] * mul;
mul *= 256;
}
return result;
}
exports.readUintBE = readUintBE;
/**
* Reads bytes from array starting at offset as little-endian
* unsigned bitLen-bit integer and returns it.
*
* Supports bit lengths divisible by 8, up to 48.
*/
function readUintLE(bitLength, array, offset) {
if (offset === void 0) { offset = 0; }
// TODO(dchest): implement support for bitLengths non-divisible by 8
if (bitLength % 8 !== 0) {
throw new Error("readUintLE supports only bitLengths divisible by 8");
}
if (bitLength / 8 > array.length - offset) {
throw new Error("readUintLE: array is too short for the given bitLength");
}
var result = 0;
var mul = 1;
for (var i = offset; i < offset + bitLength / 8; i++) {
result += array[i] * mul;
mul *= 256;
}
return result;
}
exports.readUintLE = readUintLE;
/**
* Writes a big-endian representation of bitLen-bit unsigned
* value to array starting at offset.
*
* Supports bit lengths divisible by 8, up to 48.
*
* If byte array is not given, creates a new one.
*
* Returns the output byte array.
*/
function writeUintBE(bitLength, value, out, offset) {
if (out === void 0) { out = new Uint8Array(bitLength / 8); }
if (offset === void 0) { offset = 0; }
// TODO(dchest): implement support for bitLengths non-divisible by 8
if (bitLength % 8 !== 0) {
throw new Error("writeUintBE supports only bitLengths divisible by 8");
}
if (!int_1.isSafeInteger(value)) {
throw new Error("writeUintBE value must be an integer");
}
var div = 1;
for (var i = bitLength / 8 + offset - 1; i >= offset; i--) {
out[i] = (value / div) & 0xff;
div *= 256;
}
return out;
}
exports.writeUintBE = writeUintBE;
/**
* Writes a little-endian representation of bitLen-bit unsigned
* value to array starting at offset.
*
* Supports bit lengths divisible by 8, up to 48.
*
* If byte array is not given, creates a new one.
*
* Returns the output byte array.
*/
function writeUintLE(bitLength, value, out, offset) {
if (out === void 0) { out = new Uint8Array(bitLength / 8); }
if (offset === void 0) { offset = 0; }
// TODO(dchest): implement support for bitLengths non-divisible by 8
if (bitLength % 8 !== 0) {
throw new Error("writeUintLE supports only bitLengths divisible by 8");
}
if (!int_1.isSafeInteger(value)) {
throw new Error("writeUintLE value must be an integer");
}
var div = 1;
for (var i = offset; i < offset + bitLength / 8; i++) {
out[i] = (value / div) & 0xff;
div *= 256;
}
return out;
}
exports.writeUintLE = writeUintLE;
/**
* Reads 4 bytes from array starting at offset as big-endian
* 32-bit floating-point number and returns it.
*/
function readFloat32BE(array, offset) {
if (offset === void 0) { offset = 0; }
var view = new DataView(array.buffer, array.byteOffset, array.byteLength);
return view.getFloat32(offset);
}
exports.readFloat32BE = readFloat32BE;
/**
* Reads 4 bytes from array starting at offset as little-endian
* 32-bit floating-point number and returns it.
*/
function readFloat32LE(array, offset) {
if (offset === void 0) { offset = 0; }
var view = new DataView(array.buffer, array.byteOffset, array.byteLength);
return view.getFloat32(offset, true);
}
exports.readFloat32LE = readFloat32LE;
/**
* Reads 8 bytes from array starting at offset as big-endian
* 64-bit floating-point number ("double") and returns it.
*/
function readFloat64BE(array, offset) {
if (offset === void 0) { offset = 0; }
var view = new DataView(array.buffer, array.byteOffset, array.byteLength);
return view.getFloat64(offset);
}
exports.readFloat64BE = readFloat64BE;
/**
* Reads 8 bytes from array starting at offset as little-endian
* 64-bit floating-point number ("double") and returns it.
*/
function readFloat64LE(array, offset) {
if (offset === void 0) { offset = 0; }
var view = new DataView(array.buffer, array.byteOffset, array.byteLength);
return view.getFloat64(offset, true);
}
exports.readFloat64LE = readFloat64LE;
/**
* Writes 4-byte big-endian floating-point representation of value
* to byte array starting at offset.
*
* If byte array is not given, creates a new 4-byte one.
*
* Returns the output byte array.
*/
function writeFloat32BE(value, out, offset) {
if (out === void 0) { out = new Uint8Array(4); }
if (offset === void 0) { offset = 0; }
var view = new DataView(out.buffer, out.byteOffset, out.byteLength);
view.setFloat32(offset, value);
return out;
}
exports.writeFloat32BE = writeFloat32BE;
/**
* Writes 4-byte little-endian floating-point representation of value
* to byte array starting at offset.
*
* If byte array is not given, creates a new 4-byte one.
*
* Returns the output byte array.
*/
function writeFloat32LE(value, out, offset) {
if (out === void 0) { out = new Uint8Array(4); }
if (offset === void 0) { offset = 0; }
var view = new DataView(out.buffer, out.byteOffset, out.byteLength);
view.setFloat32(offset, value, true);
return out;
}
exports.writeFloat32LE = writeFloat32LE;
/**
* Writes 8-byte big-endian floating-point representation of value
* to byte array starting at offset.
*
* If byte array is not given, creates a new 8-byte one.
*
* Returns the output byte array.
*/
function writeFloat64BE(value, out, offset) {
if (out === void 0) { out = new Uint8Array(8); }
if (offset === void 0) { offset = 0; }
var view = new DataView(out.buffer, out.byteOffset, out.byteLength);
view.setFloat64(offset, value);
return out;
}
exports.writeFloat64BE = writeFloat64BE;
/**
* Writes 8-byte little-endian floating-point representation of value
* to byte array starting at offset.
*
* If byte array is not given, creates a new 8-byte one.
*
* Returns the output byte array.
*/
function writeFloat64LE(value, out, offset) {
if (out === void 0) { out = new Uint8Array(8); }
if (offset === void 0) { offset = 0; }
var view = new DataView(out.buffer, out.byteOffset, out.byteLength);
view.setFloat64(offset, value, true);
return out;
}
exports.writeFloat64LE = writeFloat64LE;
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