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let iconv;
try { iconv = require('iconv-lite'); } catch (error) {}
class DecodeStream {
constructor(buffer) {
this.buffer = buffer;
this.pos = 0;
this.length = this.buffer.length;
}
readString(length, encoding = 'ascii') {
switch (encoding) {
case 'utf16le': case 'ucs2': case 'utf8': case 'ascii':
return this.buffer.toString(encoding, this.pos, (this.pos += length));
case 'utf16be':
var buf = Buffer.from(this.readBuffer(length));
// swap the bytes
for (let i = 0, end = buf.length - 1; i < end; i += 2) {
const byte = buf[i];
buf[i] = buf[i + 1];
buf[i + 1] = byte;
}
return buf.toString('utf16le');
default:
buf = this.readBuffer(length);
if (iconv) {
try {
return iconv.decode(buf, encoding);
} catch (error1) {}
}
return buf;
}
}
readBuffer(length) {
return this.buffer.slice(this.pos, (this.pos += length));
}
readUInt24BE() {
return (this.readUInt16BE() << 8) + this.readUInt8();
}
readUInt24LE() {
return this.readUInt16LE() + (this.readUInt8() << 16);
}
readInt24BE() {
return (this.readInt16BE() << 8) + this.readUInt8();
}
readInt24LE() {
return this.readUInt16LE() + (this.readInt8() << 16);
}
}
DecodeStream.TYPES = {
UInt8: 1,
UInt16: 2,
UInt24: 3,
UInt32: 4,
Int8: 1,
Int16: 2,
Int24: 3,
Int32: 4,
Float: 4,
Double: 8
};
for (let key in Buffer.prototype) {
if (key.slice(0, 4) === 'read') {
const bytes = DecodeStream.TYPES[key.replace(/read|[BL]E/g, '')];
DecodeStream.prototype[key] = function() {
const ret = this.buffer[key](this.pos);
this.pos += bytes;
return ret;
};
}
}
module.exports = DecodeStream;