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const bufferOverflowExceptionMsg = "BufferOverflowException";
const bufferUnderflowExceptionMsg = "BufferUnderflowException";
const indexOutOfBoundsExceptionMsg = "IndexOutOfBoundsException";
// Singleton TextEncoder for UTF-8 string encoding
const textEncoder = new TextEncoder();
export class Buffer {
constructor(buffer) {
if (buffer !== undefined) {
this.b = buffer;
this.v = new DataView(this.b);
this._limit = this.b.byteLength;
} else {
this.b = null; // ArrayBuffer
this.v = null; // DataView
this._limit = 0;
}
this._position = 0;
this._shrinkCounter = 0;
}
empty() {
return this._limit === 0;
}
resize(n) {
if (n === 0) {
this.clear();
} else if (n > this.capacity) {
this.reserve(n);
}
this._limit = n;
}
clear() {
this.b = null;
this.v = null;
this._position = 0;
this._limit = 0;
}
//
// Call expand(n) to add room for n additional bytes. Note that expand()
// examines the current position of the buffer first; we don't want to
// expand the buffer if the caller is writing to a location that is
// already in the buffer.
//
expand(n) {
const sz = this.capacity === 0 ? n : this._position + n;
if (sz > this._limit) {
this.resize(sz);
}
}
reserve(n) {
if (n > this.capacity) {
const capacity = Math.max(1024, Math.max(n, 2 * this.capacity));
if (!this.b) {
this.b = new ArrayBuffer(capacity);
} else {
const b = new Uint8Array(capacity);
b.set(new Uint8Array(this.b, 0, this._limit));
this.b = b.buffer;
}
this.v = new DataView(this.b);
} else if (n < this.capacity) {
this.b = this.b.slice(0, n);
this.v = new DataView(this.b);
}
}
put(v) {
if (this._position === this._limit) {
throw new RangeError(bufferOverflowExceptionMsg);
}
this.v.setUint8(this._position, v);
this._position++;
}
putAt(i, v) {
if (i >= this._limit) {
throw new RangeError(indexOutOfBoundsExceptionMsg);
}
this.v.setUint8(i, v);
}
putArray(v) {
// Expects an Uint8Array
if (!(v instanceof Uint8Array)) {
throw new TypeError("argument is not a Uint8Array");
}
if (v.byteLength > 0) {
if (this._position + v.length > this._limit) {
throw new RangeError(bufferOverflowExceptionMsg);
}
new Uint8Array(this.b, this._position, v.byteLength).set(v);
this._position += v.byteLength;
}
}
putShort(v) {
if (this._position + 2 > this._limit) {
throw new RangeError(bufferOverflowExceptionMsg);
}
this.v.setInt16(this._position, v, true);
this._position += 2;
}
putInt(v) {
if (this._position + 4 > this._limit) {
throw new RangeError(bufferOverflowExceptionMsg);
}
this.v.setInt32(this._position, v, true);
this._position += 4;
}
putIntAt(i, v) {
if (i + 4 > this._limit || i < 0) {
throw new RangeError(indexOutOfBoundsExceptionMsg);
}
this.v.setInt32(i, v, true);
}
putFloat(v) {
if (this._position + 4 > this._limit) {
throw new RangeError(bufferOverflowExceptionMsg);
}
this.v.setFloat32(this._position, v, true);
this._position += 4;
}
putDouble(v) {
if (this._position + 8 > this._limit) {
throw new RangeError(bufferOverflowExceptionMsg);
}
this.v.setFloat64(this._position, v, true);
this._position += 8;
}
putLong(v) {
if (this._position + 8 > this._limit) {
throw new RangeError(bufferOverflowExceptionMsg);
}
this.v.setBigInt64(this._position, v, true);
this._position += 8;
}
writeString(stream, v) {
const encoded = textEncoder.encode(v);
stream.writeSize(encoded.length);
this.expand(encoded.length);
new Uint8Array(this.b, this._position, encoded.length).set(encoded);
this._position += encoded.length;
this._limit = this._position;
}
get() {
if (this._position >= this._limit) {
throw new RangeError(bufferUnderflowExceptionMsg);
}
const v = this.v.getUint8(this._position);
this._position++;
return v;
}
getAt(i) {
if (i < 0 || i >= this._limit) {
throw new RangeError(indexOutOfBoundsExceptionMsg);
}
return this.v.getUint8(i);
}
getArray(length) {
if (this._position + length > this._limit) {
throw new RangeError(bufferUnderflowExceptionMsg);
}
const buffer = this.b.slice(this._position, this._position + length);
this._position += length;
return new Uint8Array(buffer);
}
getArrayAt(position, length) {
if (position + length > this._limit) {
throw new RangeError(bufferUnderflowExceptionMsg);
}
if (length === undefined) {
return new Uint8Array(this.b.slice(position));
} else {
return new Uint8Array(this.b.slice(position, position + length));
}
}
getShort() {
if (this._limit - this._position < 2) {
throw new RangeError(bufferUnderflowExceptionMsg);
}
const v = this.v.getInt16(this._position, true);
this._position += 2;
return v;
}
getInt() {
if (this._limit - this._position < 4) {
throw new RangeError(bufferUnderflowExceptionMsg);
}
const v = this.v.getInt32(this._position, true);
this._position += 4;
return v;
}
getFloat() {
if (this._limit - this._position < 4) {
throw new RangeError(bufferUnderflowExceptionMsg);
}
const v = this.v.getFloat32(this._position, true);
this._position += 4;
return v;
}
getDouble() {
if (this._limit - this._position < 8) {
throw new RangeError(bufferUnderflowExceptionMsg);
}
const v = this.v.getFloat64(this._position, true);
this._position += 8;
return v;
}
getLong() {
if (this._limit - this._position < 8) {
throw new RangeError(bufferUnderflowExceptionMsg);
}
const v = this.v.getBigInt64(this._position, true);
this._position += 8;
return v;
}
getString(length) {
if (this._position + length > this._limit) {
throw new RangeError(bufferUnderflowExceptionMsg);
}
const data = new DataView(this.b, this._position, length);
let s = "";
for (let i = 0; i < length; ++i) {
s += String.fromCharCode(data.getUint8(i));
}
this._position += length;
return decodeURIComponent(escape(s));
}
get position() {
return this._position;
}
set position(value) {
if (value >= 0 && value <= this._limit) {
this._position = value;
}
}
get limit() {
return this._limit;
}
get capacity() {
return this.b === null ? 0 : this.b.byteLength;
}
get remaining() {
return this._limit - this._position;
}
}
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