{"version":3,"file":"encoder.d.ts","sourceRoot":"","sources":["../../src/cbor/encoder.ts"],"names":[],"mappings":"AAAA,OAAO,EAEN,KAAK,WAAW,EAOhB,MAAM,cAAc,CAAC;AAwMtB,sEAAsE;AACtE,wBAAgB,UAAU,CAAC,KAAK,EAAE,OAAO,EAAE,OAAO,CAAC,EAAE,WAAW,GAAG,UAAU,CAK5E","sourcesContent":["import {\n\tCborError,\n\ttype CborOptions,\n\tMAX_UINT32,\n\ttype ResolvedCborOptions,\n\tresolveOptions,\n\ttextDecoder,\n\ttextEncoder,\n\tUINT32_BASE,\n} from \"./options.ts\";\n\nclass CborWriter {\n\tprivate buffer: Uint8Array;\n\tprivate offset = 0;\n\tprivate readonly maxByteLength: number;\n\n\tconstructor(maxByteLength: number) {\n\t\tthis.maxByteLength = maxByteLength;\n\t\tthis.buffer = new Uint8Array(Math.min(256, maxByteLength));\n\t}\n\n\twriteByte(value: number): void {\n\t\tthis.ensureCapacity(1);\n\t\tthis.buffer[this.offset] = value;\n\t\tthis.offset++;\n\t}\n\n\twriteBytes(bytes: Uint8Array): void {\n\t\tthis.ensureCapacity(bytes.byteLength);\n\t\tthis.buffer.set(bytes, this.offset);\n\t\tthis.offset += bytes.byteLength;\n\t}\n\n\twriteUint16(value: number): void {\n\t\tthis.ensureCapacity(2);\n\t\tthis.buffer[this.offset] = value >>> 8;\n\t\tthis.buffer[this.offset + 1] = value;\n\t\tthis.offset += 2;\n\t}\n\n\twriteUint32(value: number): void {\n\t\tthis.ensureCapacity(4);\n\t\tthis.buffer[this.offset] = value >>> 24;\n\t\tthis.buffer[this.offset + 1] = value >>> 16;\n\t\tthis.buffer[this.offset + 2] = value >>> 8;\n\t\tthis.buffer[this.offset + 3] = value;\n\t\tthis.offset += 4;\n\t}\n\n\twriteUint64(value: number): void {\n\t\tconst high = Math.floor(value / UINT32_BASE);\n\t\tconst low = value - high * UINT32_BASE;\n\t\tthis.writeUint32(high);\n\t\tthis.writeUint32(low);\n\t}\n\n\twriteFloat64(value: number): void {\n\t\tthis.ensureCapacity(9);\n\t\tthis.buffer[this.offset] = 0xfb;\n\t\tnew DataView(this.buffer.buffer).setFloat64(this.offset + 1, value, false);\n\t\tthis.offset += 9;\n\t}\n\n\tfinish(): Uint8Array {\n\t\treturn this.buffer.slice(0, this.offset);\n\t}\n\n\tprivate ensureCapacity(additionalBytes: number): void {\n\t\tconst required = this.offset + additionalBytes;\n\t\tif (required > this.maxByteLength) {\n\t\t\tthrow new CborError(`CBOR byte length exceeds configured limit of ${this.maxByteLength}`);\n\t\t}\n\t\tif (required <= this.buffer.byteLength) return;\n\n\t\tlet capacity = Math.max(1, this.buffer.byteLength);\n\t\twhile (capacity < required) capacity = Math.min(this.maxByteLength, Math.max(required, capacity * 2));\n\t\tconst expanded = new Uint8Array(capacity);\n\t\texpanded.set(this.buffer);\n\t\tthis.buffer = expanded;\n\t}\n}\n\nfunction writeArgument(writer: CborWriter, majorType: number, value: number): void {\n\tconst prefix = majorType << 5;\n\tif (value < 24) {\n\t\twriter.writeByte(prefix | value);\n\t} else if (value <= 0xff) {\n\t\twriter.writeByte(prefix | 24);\n\t\twriter.writeByte(value);\n\t} else if (value <= 0xffff) {\n\t\twriter.writeByte(prefix | 25);\n\t\twriter.writeUint16(value);\n\t} else if (value <= MAX_UINT32) {\n\t\twriter.writeByte(prefix | 26);\n\t\twriter.writeUint32(value);\n\t} else {\n\t\twriter.writeByte(prefix | 27);\n\t\twriter.writeUint64(value);\n\t}\n}\n\nfunction isPlainObject(value: unknown): value is Record<string, unknown> {\n\tif (typeof value !== \"object\" || value === null) return false;\n\tconst prototype = Object.getPrototypeOf(value);\n\treturn prototype === Object.prototype || prototype === null;\n}\n\nfunction encodeText(writer: CborWriter, value: string, options: ResolvedCborOptions): void {\n\tconst bytes = textEncoder.encode(value);\n\tif (bytes.byteLength > options.maxByteLength) {\n\t\tthrow new CborError(`CBOR text string length exceeds configured limit of ${options.maxByteLength}`);\n\t}\n\tif (textDecoder.decode(bytes) !== value)\n\t\tthrow new CborError(\"CBOR text strings must contain valid Unicode scalar values\");\n\twriteArgument(writer, 3, bytes.byteLength);\n\twriter.writeBytes(bytes);\n}\n\nfunction encodeValue(\n\twriter: CborWriter,\n\tvalue: unknown,\n\toptions: ResolvedCborOptions,\n\tdepth: number,\n\tancestors: Set<object>,\n): void {\n\tif (depth > options.maxDepth)\n\t\tthrow new CborError(`CBOR nesting depth exceeds configured limit of ${options.maxDepth}`);\n\n\tif (value === null) {\n\t\twriter.writeByte(0xf6);\n\t\treturn;\n\t}\n\tif (typeof value === \"boolean\") {\n\t\twriter.writeByte(value ? 0xf5 : 0xf4);\n\t\treturn;\n\t}\n\tif (typeof value === \"number\") {\n\t\tif (!Number.isFinite(value)) throw new CborError(\"CBOR numbers must be finite\");\n\t\tif (Number.isInteger(value) && !Object.is(value, -0)) {\n\t\t\tif (!Number.isSafeInteger(value)) throw new CborError(\"CBOR integers must be safe JavaScript integers\");\n\t\t\tif (value >= 0) writeArgument(writer, 0, value);\n\t\t\telse writeArgument(writer, 1, -1 - value);\n\t\t} else {\n\t\t\twriter.writeFloat64(value);\n\t\t}\n\t\treturn;\n\t}\n\tif (typeof value === \"string\") {\n\t\tencodeText(writer, value, options);\n\t\treturn;\n\t}\n\tif (value instanceof Uint8Array) {\n\t\tif (value.byteLength > options.maxByteLength) {\n\t\t\tthrow new CborError(`CBOR byte string length exceeds configured limit of ${options.maxByteLength}`);\n\t\t}\n\t\twriteArgument(writer, 2, value.byteLength);\n\t\twriter.writeBytes(value);\n\t\treturn;\n\t}\n\tif (Array.isArray(value)) {\n\t\tif (ancestors.has(value)) throw new CborError(\"CBOR values must not contain cycles\");\n\t\tif (value.length > options.maxContainerLength) {\n\t\t\tthrow new CborError(`CBOR array length exceeds configured limit of ${options.maxContainerLength}`);\n\t\t}\n\t\tancestors.add(value);\n\t\ttry {\n\t\t\twriteArgument(writer, 4, value.length);\n\t\t\tfor (let index = 0; index < value.length; index++) {\n\t\t\t\tif (!Object.hasOwn(value, index) || value[index] === undefined) {\n\t\t\t\t\tthrow new CborError(\"CBOR arrays must not contain holes or undefined values\");\n\t\t\t\t}\n\t\t\t\tencodeValue(writer, value[index], options, depth + 1, ancestors);\n\t\t\t}\n\t\t} finally {\n\t\t\tancestors.delete(value);\n\t\t}\n\t\treturn;\n\t}\n\tif (isPlainObject(value)) {\n\t\tif (ancestors.has(value)) throw new CborError(\"CBOR values must not contain cycles\");\n\t\tfor (const symbol of Object.getOwnPropertySymbols(value)) {\n\t\t\tif (Object.prototype.propertyIsEnumerable.call(value, symbol)) {\n\t\t\t\tthrow new CborError(\"CBOR map keys must be strings\");\n\t\t\t}\n\t\t}\n\t\tconst entries: Array<readonly [string, unknown]> = [];\n\t\tfor (const key of Object.keys(value)) {\n\t\t\tconst entryValue = value[key];\n\t\t\tif (entryValue !== undefined) entries.push([key, entryValue]);\n\t\t}\n\t\tif (entries.length > options.maxContainerLength) {\n\t\t\tthrow new CborError(`CBOR map length exceeds configured limit of ${options.maxContainerLength}`);\n\t\t}\n\t\tancestors.add(value);\n\t\ttry {\n\t\t\twriteArgument(writer, 5, entries.length);\n\t\t\tfor (const [key, entryValue] of entries) {\n\t\t\t\tencodeText(writer, key, options);\n\t\t\t\tencodeValue(writer, entryValue, options, depth + 1, ancestors);\n\t\t\t}\n\t\t} finally {\n\t\t\tancestors.delete(value);\n\t\t}\n\t\treturn;\n\t}\n\n\tthrow new CborError(`Unsupported CBOR value type: ${typeof value}`);\n}\n\n/** Encodes the protocol's strict, definite-length RFC 8949 subset. */\nexport function encodeCbor(value: unknown, options?: CborOptions): Uint8Array {\n\tconst resolved = resolveOptions(options);\n\tconst writer = new CborWriter(resolved.maxByteLength);\n\tencodeValue(writer, value, resolved, 0, new Set<object>());\n\treturn writer.finish();\n}\n"]}