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import {
BsonBinary,
BsonDbPointer,
BsonDecimal128,
BsonJavascriptCode,
BsonJavascriptCodeWithScope,
BsonMaxKey,
BsonMinKey,
BsonObjectId,
BsonTimestamp,
} from './values';
import type {IReader, IReaderResettable} from '@jsonjoy.com/buffers/lib';
import type {BinaryJsonDecoder} from '../types';
export class BsonDecoder implements BinaryJsonDecoder {
public constructor(public reader: IReader & IReaderResettable = new Reader()) {}
public read(uint8: Uint8Array): unknown {
this.reader.reset(uint8);
return this.readDocument();
}
public decode(uint8: Uint8Array): unknown {
this.reader.reset(uint8);
return this.readDocument();
}
public readAny(): unknown {
return this.readDocument();
}
public readDocument(): Record<string, unknown> {
const reader = this.reader;
const documentSize = reader.view.getInt32(reader.x, true); // true = little-endian
reader.x += 4;
const startPos = reader.x; // Position after reading the size
const endPos = startPos + documentSize - 4 - 1; // End position before the terminating null
const obj: Record<string, unknown> = {};
while (reader.x < endPos) {
const elementType = reader.u8();
Iif (elementType === 0) break; // End of document
const key = this.readCString();
const value = this.readElementValue(elementType);
obj[key] = value;
}
// Skip to the end of document (including the terminating null if we haven't read it)
if (reader.x <= endPos) {
reader.x = startPos + documentSize - 4; // Move to just after the terminating null
}
return obj;
}
public readCString(): string {
const reader = this.reader;
const uint8 = reader.uint8;
const x = reader.x;
let length = 0;
// Find the null terminator
while (uint8[x + length] !== 0) {
length++;
}
if (length === 0) {
reader.x++; // Skip the null byte
return '';
}
const str = reader.utf8(length);
reader.x++; // Skip the null terminator
return str;
}
public readString(): string {
const reader = this.reader;
const length = reader.view.getInt32(reader.x, true); // true = little-endian
reader.x += 4;
Iif (length <= 0) {
throw new Error('Invalid string length');
}
const str = reader.utf8(length - 1); // Length includes null terminator
reader.x++; // Skip null terminator
return str;
}
public readElementValue(type: number): unknown {
const reader = this.reader;
switch (type) {
case 0x01: {
// double - 64-bit binary floating point
const doubleVal = reader.view.getFloat64(reader.x, true);
reader.x += 8;
return doubleVal;
}
case 0x02: // string - UTF-8 string
return this.readString();
case 0x03: // document - Embedded document
return this.readDocument();
case 0x04: // array - Array
return this.readArray();
case 0x05: // binary - Binary data
return this.readBinary();
case 0x06: // undefined (deprecated)
return undefined;
case 0x07: // ObjectId
return this.readObjectId();
case 0x08: // boolean
return reader.u8() === 1;
case 0x09: {
// UTC datetime
const dateVal = reader.view.getBigInt64(reader.x, true);
reader.x += 8;
return new Date(Number(dateVal));
}
case 0x0a: // null
return null;
case 0x0b: // regex
return this.readRegex();
case 0x0c: // DBPointer (deprecated)
return this.readDbPointer();
case 0x0d: // JavaScript code
return new BsonJavascriptCode(this.readString());
case 0x0e: // Symbol (deprecated)
return Symbol(this.readString());
case 0x0f: // JavaScript code with scope (deprecated)
return this.readCodeWithScope();
case 0x10: {
// 32-bit integer
const int32Val = reader.view.getInt32(reader.x, true);
reader.x += 4;
return int32Val;
}
case 0x11: // Timestamp
return this.readTimestamp();
case 0x12: {
// 64-bit integer
const int64Val = reader.view.getBigInt64(reader.x, true);
reader.x += 8;
return Number(int64Val);
}
case 0x13: // 128-bit decimal floating point
return this.readDecimal128();
case 0xff: // Min key
return new BsonMinKey();
case 0x7f: // Max key
return new BsonMaxKey();
default:
throw new Error(`Unsupported BSON type: 0x${type.toString(16)}`);
}
}
public readArray(): unknown[] {
const doc = this.readDocument() as Record<string, unknown>;
const keys = Object.keys(doc).sort((a, b) => parseInt(a, 10) - parseInt(b, 10));
return keys.map((key) => doc[key]);
}
public readBinary(): BsonBinary | Uint8Array {
const reader = this.reader;
const length = reader.view.getInt32(reader.x, true);
reader.x += 4;
const subtype = reader.u8();
const data = reader.buf(length);
// For generic binary subtype, return Uint8Array for compatibility
if (subtype === 0) {
return data;
}
return new BsonBinary(subtype, data);
}
public readObjectId(): BsonObjectId {
const reader = this.reader;
const uint8 = reader.uint8;
const x = reader.x;
// Timestamp (4 bytes, big-endian)
const timestamp = (uint8[x] << 24) | (uint8[x + 1] << 16) | (uint8[x + 2] << 8) | uint8[x + 3];
// Process ID (5 bytes) - first 4 bytes are little-endian, then 1 high byte
const processLo = uint8[x + 4] | (uint8[x + 5] << 8) | (uint8[x + 6] << 16) | (uint8[x + 7] << 24);
const processHi = uint8[x + 8];
// Convert to unsigned 32-bit first, then combine with high byte
const processLoUnsigned = processLo >>> 0; // Convert to unsigned
const process = processLoUnsigned + processHi * 0x100000000;
// Counter (3 bytes, big-endian)
const counter = (uint8[x + 9] << 16) | (uint8[x + 10] << 8) | uint8[x + 11];
reader.x += 12;
return new BsonObjectId(timestamp, process, counter);
}
public readRegex(): RegExp {
const pattern = this.readCString();
const flags = this.readCString();
return new RegExp(pattern, flags);
}
public readDbPointer(): BsonDbPointer {
const name = this.readString();
const id = this.readObjectId();
return new BsonDbPointer(name, id);
}
public readCodeWithScope(): BsonJavascriptCodeWithScope {
const reader = this.reader;
const _totalLength = reader.view.getInt32(reader.x, true);
reader.x += 4;
const code = this.readString();
const scope = this.readDocument() as Record<string, unknown>;
return new BsonJavascriptCodeWithScope(code, scope);
}
public readTimestamp(): BsonTimestamp {
const reader = this.reader;
const increment = reader.view.getInt32(reader.x, true);
reader.x += 4;
const timestamp = reader.view.getInt32(reader.x, true);
reader.x += 4;
return new BsonTimestamp(increment, timestamp);
}
public readDecimal128(): BsonDecimal128 {
const reader = this.reader;
const data = reader.buf(16);
return new BsonDecimal128(data);
}
}
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