import * as ieee754 from 'ieee754'; import { Buffer } from 'node:buffer'; // Primitive types function dv(array) { return new DataView(array.buffer, array.byteOffset); } /** * 8-bit unsigned integer */ export const UINT8 = { len: 1, get(array, offset) { return dv(array).getUint8(offset); }, put(array, offset, value) { dv(array).setUint8(offset, value); return offset + 1; } }; /** * 16-bit unsigned integer, Little Endian byte order */ export const UINT16_LE = { len: 2, get(array, offset) { return dv(array).getUint16(offset, true); }, put(array, offset, value) { dv(array).setUint16(offset, value, true); return offset + 2; } }; /** * 16-bit unsigned integer, Big Endian byte order */ export const UINT16_BE = { len: 2, get(array, offset) { return dv(array).getUint16(offset); }, put(array, offset, value) { dv(array).setUint16(offset, value); return offset + 2; } }; /** * 24-bit unsigned integer, Little Endian byte order */ export const UINT24_LE = { len: 3, get(array, offset) { const dataView = dv(array); return dataView.getUint8(offset) + (dataView.getUint16(offset + 1, true) << 8); }, put(array, offset, value) { const dataView = dv(array); dataView.setUint8(offset, value & 0xff); dataView.setUint16(offset + 1, value >> 8, true); return offset + 3; } }; /** * 24-bit unsigned integer, Big Endian byte order */ export const UINT24_BE = { len: 3, get(array, offset) { const dataView = dv(array); return (dataView.getUint16(offset) << 8) + dataView.getUint8(offset + 2); }, put(array, offset, value) { const dataView = dv(array); dataView.setUint16(offset, value >> 8); dataView.setUint8(offset + 2, value & 0xff); return offset + 3; } }; /** * 32-bit unsigned integer, Little Endian byte order */ export const UINT32_LE = { len: 4, get(array, offset) { return dv(array).getUint32(offset, true); }, put(array, offset, value) { dv(array).setUint32(offset, value, true); return offset + 4; } }; /** * 32-bit unsigned integer, Big Endian byte order */ export const UINT32_BE = { len: 4, get(array, offset) { return dv(array).getUint32(offset); }, put(array, offset, value) { dv(array).setUint32(offset, value); return offset + 4; } }; /** * 8-bit signed integer */ export const INT8 = { len: 1, get(array, offset) { return dv(array).getInt8(offset); }, put(array, offset, value) { dv(array).setInt8(offset, value); return offset + 1; } }; /** * 16-bit signed integer, Big Endian byte order */ export const INT16_BE = { len: 2, get(array, offset) { return dv(array).getInt16(offset); }, put(array, offset, value) { dv(array).setInt16(offset, value); return offset + 2; } }; /** * 16-bit signed integer, Little Endian byte order */ export const INT16_LE = { len: 2, get(array, offset) { return dv(array).getInt16(offset, true); }, put(array, offset, value) { dv(array).setInt16(offset, value, true); return offset + 2; } }; /** * 24-bit signed integer, Little Endian byte order */ export const INT24_LE = { len: 3, get(array, offset) { const unsigned = UINT24_LE.get(array, offset); return unsigned > 0x7fffff ? unsigned - 0x1000000 : unsigned; }, put(array, offset, value) { const dataView = dv(array); dataView.setUint8(offset, value & 0xff); dataView.setUint16(offset + 1, value >> 8, true); return offset + 3; } }; /** * 24-bit signed integer, Big Endian byte order */ export const INT24_BE = { len: 3, get(array, offset) { const unsigned = UINT24_BE.get(array, offset); return unsigned > 0x7fffff ? unsigned - 0x1000000 : unsigned; }, put(array, offset, value) { const dataView = dv(array); dataView.setUint16(offset, value >> 8); dataView.setUint8(offset + 2, value & 0xff); return offset + 3; } }; /** * 32-bit signed integer, Big Endian byte order */ export const INT32_BE = { len: 4, get(array, offset) { return dv(array).getInt32(offset); }, put(array, offset, value) { dv(array).setInt32(offset, value); return offset + 4; } }; /** * 32-bit signed integer, Big Endian byte order */ export const INT32_LE = { len: 4, get(array, offset) { return dv(array).getInt32(offset, true); }, put(array, offset, value) { dv(array).setInt32(offset, value, true); return offset + 4; } }; /** * 64-bit unsigned integer, Little Endian byte order */ export const UINT64_LE = { len: 8, get(array, offset) { return dv(array).getBigUint64(offset, true); }, put(array, offset, value) { dv(array).setBigUint64(offset, value, true); return offset + 8; } }; /** * 64-bit signed integer, Little Endian byte order */ export const INT64_LE = { len: 8, get(array, offset) { return dv(array).getBigInt64(offset, true); }, put(array, offset, value) { dv(array).setBigInt64(offset, value, true); return offset + 8; } }; /** * 64-bit unsigned integer, Big Endian byte order */ export const UINT64_BE = { len: 8, get(array, offset) { return dv(array).getBigUint64(offset); }, put(array, offset, value) { dv(array).setBigUint64(offset, value); return offset + 8; } }; /** * 64-bit signed integer, Big Endian byte order */ export const INT64_BE = { len: 8, get(array, offset) { return dv(array).getBigInt64(offset); }, put(array, offset, value) { dv(array).setBigInt64(offset, value); return offset + 8; } }; /** * IEEE 754 16-bit (half precision) float, big endian */ export const Float16_BE = { len: 2, get(dataView, offset) { return ieee754.read(dataView, offset, false, 10, this.len); }, put(dataView, offset, value) { ieee754.write(dataView, value, offset, false, 10, this.len); return offset + this.len; } }; /** * IEEE 754 16-bit (half precision) float, little endian */ export const Float16_LE = { len: 2, get(array, offset) { return ieee754.read(array, offset, true, 10, this.len); }, put(array, offset, value) { ieee754.write(array, value, offset, true, 10, this.len); return offset + this.len; } }; /** * IEEE 754 32-bit (single precision) float, big endian */ export const Float32_BE = { len: 4, get(array, offset) { return dv(array).getFloat32(offset); }, put(array, offset, value) { dv(array).setFloat32(offset, value); return offset + 4; } }; /** * IEEE 754 32-bit (single precision) float, little endian */ export const Float32_LE = { len: 4, get(array, offset) { return dv(array).getFloat32(offset, true); }, put(array, offset, value) { dv(array).setFloat32(offset, value, true); return offset + 4; } }; /** * IEEE 754 64-bit (double precision) float, big endian */ export const Float64_BE = { len: 8, get(array, offset) { return dv(array).getFloat64(offset); }, put(array, offset, value) { dv(array).setFloat64(offset, value); return offset + 8; } }; /** * IEEE 754 64-bit (double precision) float, little endian */ export const Float64_LE = { len: 8, get(array, offset) { return dv(array).getFloat64(offset, true); }, put(array, offset, value) { dv(array).setFloat64(offset, value, true); return offset + 8; } }; /** * IEEE 754 80-bit (extended precision) float, big endian */ export const Float80_BE = { len: 10, get(array, offset) { return ieee754.read(array, offset, false, 63, this.len); }, put(array, offset, value) { ieee754.write(array, value, offset, false, 63, this.len); return offset + this.len; } }; /** * IEEE 754 80-bit (extended precision) float, little endian */ export const Float80_LE = { len: 10, get(array, offset) { return ieee754.read(array, offset, true, 63, this.len); }, put(array, offset, value) { ieee754.write(array, value, offset, true, 63, this.len); return offset + this.len; } }; /** * Ignore a given number of bytes */ export class IgnoreType { /** * @param len number of bytes to ignore */ constructor(len) { this.len = len; } // ToDo: don't read, but skip data // eslint-disable-next-line @typescript-eslint/no-empty-function get(array, off) { } } export class Uint8ArrayType { constructor(len) { this.len = len; } get(array, offset) { return array.subarray(offset, offset + this.len); } } export class BufferType { constructor(len) { this.len = len; } get(uint8Array, off) { return Buffer.from(uint8Array.subarray(off, off + this.len)); } } /** * Consume a fixed number of bytes from the stream and return a string with a specified encoding. */ export class StringType { constructor(len, encoding) { this.len = len; this.encoding = encoding; } get(uint8Array, offset) { return Buffer.from(uint8Array).toString(this.encoding, offset, offset + this.len); } } /** * ANSI Latin 1 String * Using windows-1252 / ISO 8859-1 decoding */ export class AnsiStringType { constructor(len) { this.len = len; } static decode(buffer, offset, until) { let str = ''; for (let i = offset; i < until; ++i) { str += AnsiStringType.codePointToString(AnsiStringType.singleByteDecoder(buffer[i])); } return str; } static inRange(a, min, max) { return min <= a && a <= max; } static codePointToString(cp) { if (cp <= 0xFFFF) { return String.fromCharCode(cp); } else { cp -= 0x10000; return String.fromCharCode((cp >> 10) + 0xD800, (cp & 0x3FF) + 0xDC00); } } static singleByteDecoder(bite) { if (AnsiStringType.inRange(bite, 0x00, 0x7F)) { return bite; } const codePoint = AnsiStringType.windows1252[bite - 0x80]; if (codePoint === null) { throw Error('invaliding encoding'); } return codePoint; } get(buffer, offset = 0) { return AnsiStringType.decode(buffer, offset, offset + this.len); } } AnsiStringType.windows1252 = [8364, 129, 8218, 402, 8222, 8230, 8224, 8225, 710, 8240, 352, 8249, 338, 141, 381, 143, 144, 8216, 8217, 8220, 8221, 8226, 8211, 8212, 732, 8482, 353, 8250, 339, 157, 382, 376, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255];