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import type {BinaryJsonEncoder} from '../types';
/**
* XDR (External Data Representation) binary encoder for basic value encoding.
* Implements XDR binary encoding according to RFC 4506.
*
* Key XDR encoding principles:
* - All data types are aligned to 4-byte boundaries
* - Multi-byte quantities are transmitted in big-endian byte order
* - Strings and opaque data are padded to 4-byte boundaries
* - Variable-length arrays and strings are preceded by their length
*/
export class XdrEncoder implements BinaryJsonEncoder {
constructor(public readonly writer: IWriter & IWriterGrowable) {}
public encode(value: unknown): Uint8Array {
const writer = this.writer;
writer.reset();
this.writeAny(value);
return writer.flush();
}
/**
* Called when the encoder encounters a value that it does not know how to encode.
*/
public writeUnknown(value: unknown): void {
this.writeVoid();
}
public writeAny(value: unknown): void {
switch (typeof value) {
case 'boolean':
return this.writeBoolean(value);
case 'number':
return this.writeNumber(value);
case 'string':
return this.writeStr(value);
case 'object': {
if (value === null) return this.writeVoid();
const construct = value.constructor;
switch (construct) {
case Uint8Array:
return this.writeBin(value as Uint8Array);
default:
return this.writeUnknown(value);
}
}
case 'bigint':
return this.writeHyper(value);
case 'undefined':
return this.writeVoid();
default:
return this.writeUnknown(value);
}
}
/**
* Writes an XDR void value (no data is actually written).
*/
public writeVoid(): void {
// Void values are encoded as no data
}
/**
* Writes an XDR null value (for interface compatibility).
*/
public writeNull(): void {
this.writeVoid();
}
/**
* Writes an XDR boolean value as a 4-byte integer.
*/
public writeBoolean(bool: boolean): void {
this.writeInt(bool ? 1 : 0);
}
/**
* Writes an XDR signed 32-bit integer in big-endian format.
*/
public writeInt(int: number): void {
const writer = this.writer;
writer.ensureCapacity(4);
writer.view.setInt32(writer.x, Math.trunc(int), false); // big-endian
writer.move(4);
}
/**
* Writes an XDR unsigned 32-bit integer in big-endian format.
*/
public writeUnsignedInt(uint: number): void {
const writer = this.writer;
writer.ensureCapacity(4);
writer.view.setUint32(writer.x, Math.trunc(uint) >>> 0, false); // big-endian
writer.move(4);
}
/**
* Writes an XDR signed 64-bit integer (hyper) in big-endian format.
*/
public writeHyper(hyper: number | bigint): void {
const writer = this.writer;
writer.ensureCapacity(8);
if (typeof hyper === 'bigint') {
writer.view.setBigInt64(writer.x, hyper, false); // big-endian
} else {
const truncated = Math.trunc(hyper);
const high = Math.floor(truncated / 0x100000000);
const low = truncated >>> 0;
writer.view.setInt32(writer.x, high, false); // high 32 bits
writer.view.setUint32(writer.x + 4, low, false); // low 32 bits
}
writer.move(8);
}
/**
* Writes an XDR unsigned 64-bit integer (unsigned hyper) in big-endian format.
*/
public writeUnsignedHyper(uhyper: number | bigint): void {
const writer = this.writer;
writer.ensureCapacity(8);
if (typeof uhyper === 'bigint') {
writer.view.setBigUint64(writer.x, uhyper, false); // big-endian
} else {
const truncated = Math.trunc(Math.abs(uhyper));
const high = Math.floor(truncated / 0x100000000);
const low = truncated >>> 0;
writer.view.setUint32(writer.x, high, false); // high 32 bits
writer.view.setUint32(writer.x + 4, low, false); // low 32 bits
}
writer.move(8);
}
/**
* Writes an XDR float value using IEEE 754 single-precision in big-endian format.
*/
public writeFloat(float: number): void {
const writer = this.writer;
writer.ensureCapacity(4);
writer.view.setFloat32(writer.x, float, false); // big-endian
writer.move(4);
}
/**
* Writes an XDR double value using IEEE 754 double-precision in big-endian format.
*/
public writeDouble(double: number): void {
const writer = this.writer;
writer.ensureCapacity(8);
writer.view.setFloat64(writer.x, double, false); // big-endian
writer.move(8);
}
/**
* Writes an XDR quadruple value (128-bit float).
* Note: JavaScript doesn't have native 128-bit float support.
*/
public writeQuadruple(quad: number): void {
throw new Error('not implemented');
}
/**
* Writes XDR opaque data with fixed length.
* Data is padded to 4-byte boundary.
*/
public writeOpaque(data: Uint8Array): void {
const size = data.length;
const writer = this.writer;
const paddedSize = Math.ceil(size / 4) * 4;
writer.ensureCapacity(paddedSize);
writer.buf(data, size);
const padding = paddedSize - size;
for (let i = 0; i < padding; i++) writer.u8(0);
}
/**
* Writes XDR variable-length opaque data.
* Length is written first, followed by data padded to 4-byte boundary.
*/
public writeVarlenOpaque(data: Uint8Array): void {
this.writeUnsignedInt(data.length);
this.writeOpaque(data);
}
/**
* Writes an XDR string with UTF-8 encoding.
* Length is written first, followed by UTF-8 bytes padded to 4-byte boundary.
*/
public writeStr(str: string): void {
const writer = this.writer;
// Write string using writer's UTF-8 method and get actual byte count
const lengthOffset = writer.x;
writer.x += 4; // Reserve space for length
const bytesWritten = writer.utf8(str);
const paddedSize = Math.ceil(bytesWritten / 4) * 4;
const padding = paddedSize - bytesWritten;
for (let i = 0; i < padding; i++) writer.u8(0);
// Go back and write the actual byte length
const currentPos = writer.x;
writer.x = lengthOffset;
this.writeUnsignedInt(bytesWritten);
writer.x = currentPos;
}
public writeArr(arr: unknown[]): void {
throw new Error('not implemented');
}
public writeObj(obj: Record<string, unknown>): void {
throw new Error('not implemented');
}
// BinaryJsonEncoder interface methods
/**
* Generic number writing - determines type based on value
*/
public writeNumber(num: number): void {
if (Number.isInteger(num)) {
if (num >= -2147483648 && num <= 2147483647) this.writeInt(num);
else this.writeHyper(num);
} else this.writeDouble(num);
}
/**
* Writes an integer value
*/
public writeInteger(int: number): void {
this.writeInt(int);
}
/**
* Writes an unsigned integer value
*/
public writeUInteger(uint: number): void {
this.writeUnsignedInt(uint);
}
/**
* Writes binary data
*/
public writeBin(buf: Uint8Array): void {
this.writeVarlenOpaque(buf);
}
/**
* Writes an ASCII string (same as regular string in XDR)
*/
public writeAsciiStr(str: string): void {
this.writeStr(str);
}
}
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