ripple-binary-codec
Version:
XRP Ledger binary codec
63 lines • 2.22 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.BytesLookup = exports.Bytes = void 0;
/*
* @brief: Bytes, name, and ordinal representing one type, ledger_type, transaction type, or result
*/
class Bytes {
constructor(name, ordinal, ordinalWidth) {
this.name = name;
this.ordinal = ordinal;
this.ordinalWidth = ordinalWidth;
this.bytes = new Uint8Array(ordinalWidth);
for (let i = 0; i < ordinalWidth; i++) {
this.bytes[ordinalWidth - i - 1] = (ordinal >>> (i * 8)) & 0xff;
}
}
toJSON() {
return this.name;
}
toBytesSink(sink) {
sink.put(this.bytes);
}
toBytes() {
return this.bytes;
}
}
exports.Bytes = Bytes;
/*
* @brief: Collection of Bytes objects, mapping bidirectionally
*/
class BytesLookup {
constructor(types, ordinalWidth) {
this.ordinalWidth = ordinalWidth;
Object.entries(types).forEach(([k, v]) => {
this.add(k, v);
});
}
/**
* Add a new name value pair to the BytesLookup.
*
* @param name - A human readable name for the field.
* @param value - The numeric value for the field.
* @throws if the name or value already exist in the lookup because it's unclear how to decode.
*/
add(name, value) {
if (this[name]) {
throw new SyntaxError(`Attempted to add a value with a duplicate name "${name}". This is not allowed because it is unclear how to decode.`);
}
if (this[value.toString()]) {
throw new SyntaxError(`Attempted to add a duplicate value under a different name (Given name: "${name}" and previous name: "${this[value.toString()]}. This is not allowed because it is unclear how to decode.\nGiven value: ${value.toString()}`);
}
this[name] = new Bytes(name, value, this.ordinalWidth);
this[value.toString()] = this[name];
}
from(value) {
return value instanceof Bytes ? value : this[value];
}
fromParser(parser) {
return this.from(parser.readUIntN(this.ordinalWidth).toString());
}
}
exports.BytesLookup = BytesLookup;
//# sourceMappingURL=bytes.js.map