{"version":3,"file":"decoder.d.ts","sourceRoot":"","sources":["../../src/cbor/decoder.ts"],"names":[],"mappings":"AAAA,OAAO,EAEN,KAAK,WAAW,EAKhB,MAAM,cAAc,CAAC;AAwJtB,2EAA2E;AAC3E,wBAAgB,UAAU,CAAC,KAAK,EAAE,UAAU,EAAE,OAAO,CAAC,EAAE,WAAW,GAAG,OAAO,CAO5E","sourcesContent":["import {\n\tCborError,\n\ttype CborOptions,\n\ttype ResolvedCborOptions,\n\tresolveOptions,\n\ttextDecoder,\n\tUINT32_BASE,\n} from \"./options.ts\";\n\nclass CborReader {\n\tprivate readonly bytes: Uint8Array;\n\tprivate offset = 0;\n\tprivate readonly options: ResolvedCborOptions;\n\n\tconstructor(bytes: Uint8Array, options: ResolvedCborOptions) {\n\t\tthis.bytes = bytes;\n\t\tthis.options = options;\n\t}\n\n\tdecode(): unknown {\n\t\tconst value = this.readItem(0);\n\t\tif (this.offset !== this.bytes.byteLength) throw new CborError(\"CBOR payload contains trailing data\");\n\t\treturn value;\n\t}\n\n\tprivate readItem(depth: number): unknown {\n\t\tif (depth > this.options.maxDepth) {\n\t\t\tthrow new CborError(`CBOR nesting depth exceeds configured limit of ${this.options.maxDepth}`);\n\t\t}\n\t\tconst initial = this.readByte();\n\t\tconst majorType = initial >>> 5;\n\t\tconst additionalInformation = initial & 0x1f;\n\n\t\tswitch (majorType) {\n\t\t\tcase 0:\n\t\t\t\treturn this.readArgument(additionalInformation);\n\t\t\tcase 1: {\n\t\t\t\tconst value = -1 - this.readArgument(additionalInformation);\n\t\t\t\tif (!Number.isSafeInteger(value)) throw new CborError(\"Decoded CBOR integer is outside the safe range\");\n\t\t\t\treturn value;\n\t\t\t}\n\t\t\tcase 2: {\n\t\t\t\tconst length = this.readLength(additionalInformation, \"byte string\", this.options.maxByteLength);\n\t\t\t\treturn new Uint8Array(this.readBytes(length));\n\t\t\t}\n\t\t\tcase 3: {\n\t\t\t\tconst length = this.readLength(additionalInformation, \"text string\", this.options.maxByteLength);\n\t\t\t\tconst bytes = this.readBytes(length);\n\t\t\t\ttry {\n\t\t\t\t\treturn textDecoder.decode(bytes);\n\t\t\t\t} catch (_error) {\n\t\t\t\t\tthrow new CborError(\"CBOR text string contains invalid UTF-8\");\n\t\t\t\t}\n\t\t\t}\n\t\t\tcase 4: {\n\t\t\t\tconst length = this.readLength(additionalInformation, \"array\", this.options.maxContainerLength);\n\t\t\t\tconst result: unknown[] = [];\n\t\t\t\tfor (let index = 0; index < length; index++) result.push(this.readItem(depth + 1));\n\t\t\t\treturn result;\n\t\t\t}\n\t\t\tcase 5: {\n\t\t\t\tconst length = this.readLength(additionalInformation, \"map\", this.options.maxContainerLength);\n\t\t\t\tconst result: Record<string, unknown> = {};\n\t\t\t\tconst keys = new Set<string>();\n\t\t\t\tfor (let index = 0; index < length; index++) {\n\t\t\t\t\tconst key = this.readItem(depth + 1);\n\t\t\t\t\tif (typeof key !== \"string\") throw new CborError(\"CBOR map keys must be strings\");\n\t\t\t\t\tif (keys.has(key)) throw new CborError(\"CBOR map contains a duplicate key\");\n\t\t\t\t\tkeys.add(key);\n\t\t\t\t\tObject.defineProperty(result, key, {\n\t\t\t\t\t\tconfigurable: true,\n\t\t\t\t\t\tenumerable: true,\n\t\t\t\t\t\tvalue: this.readItem(depth + 1),\n\t\t\t\t\t\twritable: true,\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t\treturn result;\n\t\t\t}\n\t\t\tcase 6:\n\t\t\t\tthrow new CborError(\"CBOR tags are not supported\");\n\t\t\tcase 7:\n\t\t\t\treturn this.readSimple(additionalInformation);\n\t\t\tdefault:\n\t\t\t\tthrow new CborError(\"Malformed CBOR major type\");\n\t\t}\n\t}\n\n\tprivate readSimple(additionalInformation: number): unknown {\n\t\tswitch (additionalInformation) {\n\t\t\tcase 20:\n\t\t\t\treturn false;\n\t\t\tcase 21:\n\t\t\t\treturn true;\n\t\t\tcase 22:\n\t\t\t\treturn null;\n\t\t\tcase 27: {\n\t\t\t\tconst bytes = this.readBytes(8);\n\t\t\t\tconst value = new DataView(bytes.buffer, bytes.byteOffset, bytes.byteLength).getFloat64(0, false);\n\t\t\t\tif (!Number.isFinite(value)) throw new CborError(\"Decoded CBOR number must be finite\");\n\t\t\t\tif (Number.isInteger(value) && !Number.isSafeInteger(value)) {\n\t\t\t\t\tthrow new CborError(\"Decoded CBOR integer is outside the safe range\");\n\t\t\t\t}\n\t\t\t\treturn value;\n\t\t\t}\n\t\t\tcase 31:\n\t\t\t\tthrow new CborError(\"CBOR break marker is not supported\");\n\t\t\tdefault:\n\t\t\t\tthrow new CborError(\"Unsupported CBOR simple value or floating-point width\");\n\t\t}\n\t}\n\n\tprivate readLength(additionalInformation: number, kind: string, limit: number): number {\n\t\tif (additionalInformation === 31) throw new CborError(`Indefinite-length CBOR ${kind}s are not supported`);\n\t\tconst length = this.readArgument(additionalInformation);\n\t\tif (length > limit) throw new CborError(`CBOR ${kind} length exceeds configured limit of ${limit}`);\n\t\treturn length;\n\t}\n\n\tprivate readArgument(additionalInformation: number): number {\n\t\tif (additionalInformation < 24) return additionalInformation;\n\t\tswitch (additionalInformation) {\n\t\t\tcase 24:\n\t\t\t\treturn this.readByte();\n\t\t\tcase 25: {\n\t\t\t\tconst bytes = this.readBytes(2);\n\t\t\t\treturn bytes[0]! * 0x100 + bytes[1]!;\n\t\t\t}\n\t\t\tcase 26: {\n\t\t\t\tconst bytes = this.readBytes(4);\n\t\t\t\treturn bytes[0]! * 0x1_000_000 + bytes[1]! * 0x1_0000 + bytes[2]! * 0x100 + bytes[3]!;\n\t\t\t}\n\t\t\tcase 27: {\n\t\t\t\tconst high = this.readArgument(26);\n\t\t\t\tconst low = this.readArgument(26);\n\t\t\t\tif (high > 0x1f_ffff) throw new CborError(\"Decoded CBOR integer or length is outside the safe range\");\n\t\t\t\treturn high * UINT32_BASE + low;\n\t\t\t}\n\t\t\tcase 31:\n\t\t\t\tthrow new CborError(\"Indefinite-length CBOR items are not supported\");\n\t\t\tdefault:\n\t\t\t\tthrow new CborError(\"Malformed CBOR additional information\");\n\t\t}\n\t}\n\n\tprivate readByte(): number {\n\t\tif (this.offset >= this.bytes.byteLength) throw new CborError(\"Truncated CBOR payload\");\n\t\tconst value = this.bytes[this.offset]!;\n\t\tthis.offset++;\n\t\treturn value;\n\t}\n\n\tprivate readBytes(length: number): Uint8Array {\n\t\tif (length > this.bytes.byteLength - this.offset) throw new CborError(\"Truncated CBOR payload\");\n\t\tconst value = this.bytes.subarray(this.offset, this.offset + length);\n\t\tthis.offset += length;\n\t\treturn value;\n\t}\n}\n\n/** Decodes exactly one item from the protocol's strict RFC 8949 subset. */\nexport function decodeCbor(bytes: Uint8Array, options?: CborOptions): unknown {\n\tif (!(bytes instanceof Uint8Array)) throw new TypeError(\"CBOR input must be a Uint8Array\");\n\tconst resolved = resolveOptions(options);\n\tif (bytes.byteLength > resolved.maxByteLength) {\n\t\tthrow new CborError(`CBOR byte length exceeds configured limit of ${resolved.maxByteLength}`);\n\t}\n\treturn new CborReader(bytes, resolved).decode();\n}\n"]}