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const {Number:NumberT} = require('./Number');
const utils = require('./utils');
class StringT {
constructor(length, encoding = 'ascii') {
this.length = length;
this.encoding = encoding;
}
decode(stream, parent) {
let length, pos;
if (this.length != null) {
length = utils.resolveLength(this.length, stream, parent);
} else {
let buffer;
({buffer, length, pos} = stream);
while ((pos < length) && (buffer[pos] !== 0x00)) {
++pos;
}
length = pos - stream.pos;
}
let { encoding } = this;
if (typeof encoding === 'function') {
encoding = encoding.call(parent, parent) || 'ascii';
}
const string = stream.readString(length, encoding);
if ((this.length == null) && (stream.pos < stream.length)) {
stream.pos++;
}
return string;
}
size(val, parent) {
// Use the defined value if no value was given
if (!val) {
return utils.resolveLength(this.length, null, parent);
}
let { encoding } = this;
if (typeof encoding === 'function') {
encoding = encoding.call(parent != null ? parent.val : undefined, parent != null ? parent.val : undefined) || 'ascii';
}
if (encoding === 'utf16be') {
encoding = 'utf16le';
}
let size = Buffer.byteLength(val, encoding);
if (this.length instanceof NumberT) {
size += this.length.size();
}
if ((this.length == null)) {
size++;
}
return size;
}
encode(stream, val, parent) {
let { encoding } = this;
if (typeof encoding === 'function') {
encoding = encoding.call(parent != null ? parent.val : undefined, parent != null ? parent.val : undefined) || 'ascii';
}
if (this.length instanceof NumberT) {
this.length.encode(stream, Buffer.byteLength(val, encoding));
}
stream.writeString(val, encoding);
if ((this.length == null)) {
return stream.writeUInt8(0x00);
}
}
}
module.exports = StringT;