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@solana/codecs-core

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Core types and helpers for encoding and decoding byte arrays on Solana

github.com/anza-xyz/kit

anza-xyz/kit

1 lines • 130 kB
1
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{ ReadonlyUint8Array } from './readonly-uint8array';\n\n/**\n * Concatenates an array of `Uint8Array`s into a single `Uint8Array`.\n * Reuses the original byte array when applicable.\n *\n * @param byteArrays - The array of byte arrays to concatenate.\n *\n * @example\n * ```ts\n * const bytes1 = new Uint8Array([0x01, 0x02]);\n * const bytes2 = new Uint8Array([]);\n * const bytes3 = new Uint8Array([0x03, 0x04]);\n * const bytes = mergeBytes([bytes1, bytes2, bytes3]);\n * // ^ [0x01, 0x02, 0x03, 0x04]\n * ```\n */\nexport const mergeBytes = (byteArrays: Uint8Array[]): Uint8Array => {\n const nonEmptyByteArrays = byteArrays.filter(arr => arr.length);\n if (nonEmptyByteArrays.length === 0) {\n return byteArrays.length ? byteArrays[0] : new Uint8Array();\n }\n\n if (nonEmptyByteArrays.length === 1) {\n return nonEmptyByteArrays[0];\n }\n\n const totalLength = nonEmptyByteArrays.reduce((total, arr) => total + arr.length, 0);\n const result = new Uint8Array(totalLength);\n let offset = 0;\n nonEmptyByteArrays.forEach(arr => {\n result.set(arr, offset);\n offset += arr.length;\n });\n return result;\n};\n\n/**\n * Pads a `Uint8Array` with zeroes to the specified length.\n * If the array is longer than the specified length, it is returned as-is.\n *\n * @param bytes - The byte array to pad.\n * @param length - The desired length of the byte array.\n *\n * @example\n * Adds zeroes to the end of the byte array to reach the desired length.\n * ```ts\n * const bytes = new Uint8Array([0x01, 0x02]);\n * const paddedBytes = padBytes(bytes, 4);\n * // ^ [0x01, 0x02, 0x00, 0x00]\n * ```\n *\n * @example\n * Returns the original byte array if it is already at the desired length.\n * ```ts\n * const bytes = new Uint8Array([0x01, 0x02]);\n * const paddedBytes = padBytes(bytes, 2);\n * // bytes === paddedBytes\n * ```\n */\nexport const padBytes = (bytes: ReadonlyUint8Array | Uint8Array, length: number): ReadonlyUint8Array | Uint8Array => {\n if (bytes.length >= length) return bytes;\n const paddedBytes = new Uint8Array(length).fill(0);\n paddedBytes.set(bytes);\n return paddedBytes;\n};\n\n/**\n * Fixes a `Uint8Array` to the specified length.\n * If the array is longer than the specified length, it is truncated.\n * If the array is shorter than the specified length, it is padded with zeroes.\n *\n * @param bytes - The byte array to truncate or pad.\n * @param length - The desired length of the byte array.\n *\n * @example\n * Truncates the byte array to the desired length.\n * ```ts\n * const bytes = new Uint8Array([0x01, 0x02, 0x03, 0x04]);\n * const fixedBytes = fixBytes(bytes, 2);\n * // ^ [0x01, 0x02]\n * ```\n *\n * @example\n * Adds zeroes to the end of the byte array to reach the desired length.\n * ```ts\n * const bytes = new Uint8Array([0x01, 0x02]);\n * const fixedBytes = fixBytes(bytes, 4);\n * // ^ [0x01, 0x02, 0x00, 0x00]\n * ```\n *\n * @example\n * Returns the original byte array if it is already at the desired length.\n * ```ts\n * const bytes = new Uint8Array([0x01, 0x02]);\n * const fixedBytes = fixBytes(bytes, 2);\n * // bytes === fixedBytes\n * ```\n */\nexport const fixBytes = (bytes: ReadonlyUint8Array | Uint8Array, length: number): ReadonlyUint8Array | Uint8Array =>\n padBytes(bytes.length <= length ? bytes : bytes.slice(0, length), length);\n\n/**\n * Returns true if and only if the provided `data` byte array contains\n * the provided `bytes` byte array at the specified `offset`.\n *\n * @param data - The byte sequence to search for.\n * @param bytes - The byte array in which to search for `data`.\n * @param offset - The position in `bytes` where the search begins.\n *\n * @example\n * ```ts\n * const bytes = new Uint8Array([0x01, 0x02, 0x03, 0x04]);\n * const data = new Uint8Array([0x02, 0x03]);\n * containsBytes(bytes, data, 1); // true\n * containsBytes(bytes, data, 2); // false\n * ```\n */\nexport function containsBytes(\n data: ReadonlyUint8Array | Uint8Array,\n bytes: ReadonlyUint8Array | Uint8Array,\n offset: number,\n): boolean {\n const slice = offset === 0 && data.length === bytes.length ? data : data.slice(offset, offset + bytes.length);\n if (slice.length !== bytes.length) return false;\n return bytes.every((b, i) => b === slice[i]);\n}\n","import {\n SOLANA_ERROR__CODECS__EXPECTED_FIXED_LENGTH,\n SOLANA_ERROR__CODECS__EXPECTED_VARIABLE_LENGTH,\n SolanaError,\n} from '@solana/errors';\n\nimport { ReadonlyUint8Array } from './readonly-uint8array';\n\n/**\n * Defines an offset in bytes.\n */\nexport type Offset = number;\n\n/**\n * An object that can encode a value of type {@link TFrom} into a {@link ReadonlyUint8Array}.\n *\n * This is a common interface for {@link FixedSizeEncoder} and {@link VariableSizeEncoder}.\n *\n * @interface\n * @typeParam TFrom - The type of the value to encode.\n *\n * @see {@link FixedSizeEncoder}\n * @see {@link VariableSizeEncoder}\n */\ntype BaseEncoder<TFrom> = {\n /** Encode the provided value and return the encoded bytes directly. */\n readonly encode: (value: TFrom) => ReadonlyUint8Array;\n /**\n * Writes the encoded value into the provided byte array at the given offset.\n * Returns the offset of the next byte after the encoded value.\n */\n readonly write: (value: TFrom, bytes: Uint8Array, offset: Offset) => Offset;\n};\n\n/**\n * An object that can encode a value of type {@link TFrom} into a fixed-size {@link ReadonlyUint8Array}.\n *\n * See {@link Encoder} to learn more about creating and composing encoders.\n *\n * @interface\n * @typeParam TFrom - The type of the value to encode.\n * @typeParam TSize - The fixed size of the encoded value in bytes.\n *\n * @example\n * ```ts\n * const encoder: FixedSizeEncoder<number, 4>;\n * const bytes = encoder.encode(42);\n * const size = encoder.fixedSize; // 4\n * ```\n *\n * @see {@link Encoder}\n * @see {@link VariableSizeEncoder}\n */\nexport type FixedSizeEncoder<TFrom, TSize extends number = number> = BaseEncoder<TFrom> & {\n /** The fixed size of the encoded value in bytes. */\n readonly fixedSize: TSize;\n};\n\n/**\n * An object that can encode a value of type {@link TFrom} into a variable-size {@link ReadonlyUint8Array}.\n *\n * See {@link Encoder} to learn more about creating and composing encoders.\n *\n * @interface\n * @typeParam TFrom - The type of the value to encode.\n *\n * @example\n * ```ts\n * const encoder: VariableSizeEncoder<string>;\n * const bytes = encoder.encode('hello');\n * const size = encoder.getSizeFromValue('hello');\n * ```\n *\n * @see {@link Encoder}\n * @see {@link FixedSizeEncoder}\n */\nexport type VariableSizeEncoder<TFrom> = BaseEncoder<TFrom> & {\n /** Returns the size of the encoded value in bytes for a given input. */\n readonly getSizeFromValue: (value: TFrom) => number;\n /** The maximum possible size of an encoded value in bytes, if applicable. */\n readonly maxSize?: number;\n};\n\n/**\n * An object that can encode a value of type {@link TFrom} into a {@link ReadonlyUint8Array}.\n *\n * An `Encoder` can be either:\n * - A {@link FixedSizeEncoder}, where all encoded values have the same fixed size.\n * - A {@link VariableSizeEncoder}, where encoded values can vary in size.\n *\n * @typeParam TFrom - The type of the value to encode.\n *\n * @example\n * Encoding a value into a new byte array.\n * ```ts\n * const encoder: Encoder<string>;\n * const bytes = encoder.encode('hello');\n * ```\n *\n * @example\n * Writing the encoded value into an existing byte array.\n * ```ts\n * const encoder: Encoder<string>;\n * const bytes = new Uint8Array(100);\n * const nextOffset = encoder.write('hello', bytes, 20);\n * ```\n *\n * @remarks\n * You may create `Encoders` manually using the {@link createEncoder} function but it is more common\n * to compose multiple `Encoders` together using the various helpers of the `@solana/codecs` package.\n *\n * For instance, here's how you might create an `Encoder` for a `Person` object type that contains\n * a `name` string and an `age` number:\n *\n * ```ts\n * import { getStructEncoder, addEncoderSizePrefix, getUtf8Encoder, getU32Encoder } from '@solana/codecs';\n *\n * type Person = { name: string; age: number };\n * const getPersonEncoder = (): Encoder<Person> =>\n * getStructEncoder([\n * ['name', addEncoderSizePrefix(getUtf8Encoder(), getU32Encoder())],\n * ['age', getU32Encoder()],\n * ]);\n * ```\n *\n * Note that composed `Encoder` types are clever enough to understand whether\n * they are fixed-size or variable-size. In the example above, `getU32Encoder()` is\n * a fixed-size encoder, while `addEncoderSizePrefix(getUtf8Encoder(), getU32Encoder())`\n * is a variable-size encoder. This makes the final `Person` encoder a variable-size encoder.\n *\n * @see {@link FixedSizeEncoder}\n * @see {@link VariableSizeEncoder}\n * @see {@link createEncoder}\n */\nexport type Encoder<TFrom> = FixedSizeEncoder<TFrom> | VariableSizeEncoder<TFrom>;\n\n/**\n * An object that can decode a byte array into a value of type {@link TTo}.\n *\n * This is a common interface for {@link FixedSizeDecoder} and {@link VariableSizeDecoder}.\n *\n * @interface\n * @typeParam TTo - The type of the decoded value.\n *\n * @see {@link FixedSizeDecoder}\n * @see {@link VariableSizeDecoder}\n */\ntype BaseDecoder<TTo> = {\n /** Decodes the provided byte array at the given offset (or zero) and returns the value directly. */\n readonly decode: (bytes: ReadonlyUint8Array | Uint8Array, offset?: Offset) => TTo;\n /**\n * Reads the encoded value from the provided byte array at the given offset.\n * Returns the decoded value and the offset of the next byte after the encoded value.\n */\n readonly read: (bytes: ReadonlyUint8Array | Uint8Array, offset: Offset) => [TTo, Offset];\n};\n\n/**\n * An object that can decode a fixed-size byte array into a value of type {@link TTo}.\n *\n * See {@link Decoder} to learn more about creating and composing decoders.\n *\n * @interface\n * @typeParam TTo - The type of the decoded value.\n * @typeParam TSize - The fixed size of the encoded value in bytes.\n *\n * @example\n * ```ts\n * const decoder: FixedSizeDecoder<number, 4>;\n * const value = decoder.decode(bytes);\n * const size = decoder.fixedSize; // 4\n * ```\n *\n * @see {@link Decoder}\n * @see {@link VariableSizeDecoder}\n */\nexport type FixedSizeDecoder<TTo, TSize extends number = number> = BaseDecoder<TTo> & {\n /** The fixed size of the encoded value in bytes. */\n readonly fixedSize: TSize;\n};\n\n/**\n * An object that can decode a variable-size byte array into a value of type {@link TTo}.\n *\n * See {@link Decoder} to learn more about creating and composing decoders.\n *\n * @interface\n * @typeParam TTo - The type of the decoded value.\n *\n * @example\n * ```ts\n * const decoder: VariableSizeDecoder<number>;\n * const value = decoder.decode(bytes);\n * ```\n *\n * @see {@link Decoder}\n * @see {@link VariableSizeDecoder}\n */\nexport type VariableSizeDecoder<TTo> = BaseDecoder<TTo> & {\n /** The maximum possible size of an encoded value in bytes, if applicable. */\n readonly maxSize?: number;\n};\n\n/**\n * An object that can decode a byte array into a value of type {@link TTo}.\n *\n * An `Decoder` can be either:\n * - A {@link FixedSizeDecoder}, where all byte arrays have the same fixed size.\n * - A {@link VariableSizeDecoder}, where byte arrays can vary in size.\n *\n * @typeParam TTo - The type of the decoded value.\n *\n * @example\n * Getting the decoded value from a byte array.\n * ```ts\n * const decoder: Decoder<string>;\n * const value = decoder.decode(bytes);\n * ```\n *\n * @example\n * Reading the decoded value from a byte array at a specific offset\n * and getting the offset of the next byte to read.\n * ```ts\n * const decoder: Decoder<string>;\n * const [value, nextOffset] = decoder.read('hello', bytes, 20);\n * ```\n *\n * @remarks\n * You may create `Decoders` manually using the {@link createDecoder} function but it is more common\n * to compose multiple `Decoders` together using the various helpers of the `@solana/codecs` package.\n *\n * For instance, here's how you might create an `Decoder` for a `Person` object type that contains\n * a `name` string and an `age` number:\n *\n * ```ts\n * import { getStructDecoder, addDecoderSizePrefix, getUtf8Decoder, getU32Decoder } from '@solana/codecs';\n *\n * type Person = { name: string; age: number };\n * const getPersonDecoder = (): Decoder<Person> =>\n * getStructDecoder([\n * ['name', addDecoderSizePrefix(getUtf8Decoder(), getU32Decoder())],\n * ['age', getU32Decoder()],\n * ]);\n * ```\n *\n * Note that composed `Decoder` types are clever enough to understand whether\n * they are fixed-size or variable-size. In the example above, `getU32Decoder()` is\n * a fixed-size decoder, while `addDecoderSizePrefix(getUtf8Decoder(), getU32Decoder())`\n * is a variable-size decoder. This makes the final `Person` decoder a variable-size decoder.\n *\n * @see {@link FixedSizeDecoder}\n * @see {@link VariableSizeDecoder}\n * @see {@link createDecoder}\n */\nexport type Decoder<TTo> = FixedSizeDecoder<TTo> | VariableSizeDecoder<TTo>;\n\n/**\n * An object that can encode and decode a value to and from a fixed-size byte array.\n *\n * See {@link Codec} to learn more about creating and composing codecs.\n *\n * @interface\n * @typeParam TFrom - The type of the value to encode.\n * @typeParam TTo - The type of the decoded value.\n * @typeParam TSize - The fixed size of the encoded value in bytes.\n *\n * @example\n * ```ts\n * const codec: FixedSizeCodec<number | bigint, bigint, 8>;\n * const bytes = codec.encode(42);\n * const value = codec.decode(bytes); // 42n\n * const size = codec.fixedSize; // 8\n * ```\n *\n * @see {@link Codec}\n * @see {@link VariableSizeCodec}\n */\nexport type FixedSizeCodec<TFrom, TTo extends TFrom = TFrom, TSize extends number = number> = FixedSizeDecoder<\n TTo,\n TSize\n> &\n FixedSizeEncoder<TFrom, TSize>;\n\n/**\n * An object that can encode and decode a value to and from a variable-size byte array.\n *\n * See {@link Codec} to learn more about creating and composing codecs.\n *\n * @interface\n * @typeParam TFrom - The type of the value to encode.\n * @typeParam TTo - The type of the decoded value.\n *\n * @example\n * ```ts\n * const codec: VariableSizeCodec<number | bigint, bigint>;\n * const bytes = codec.encode(42);\n * const value = codec.decode(bytes); // 42n\n * const size = codec.getSizeFromValue(42);\n * ```\n *\n * @see {@link Codec}\n * @see {@link FixedSizeCodec}\n */\nexport type VariableSizeCodec<TFrom, TTo extends TFrom = TFrom> = VariableSizeDecoder<TTo> & VariableSizeEncoder<TFrom>;\n\n/**\n * An object that can encode and decode a value to and from a byte array.\n *\n * A `Codec` can be either:\n * - A {@link FixedSizeCodec}, where all encoded values have the same fixed size.\n * - A {@link VariableSizeCodec}, where encoded values can vary in size.\n *\n * @example\n * ```ts\n * const codec: Codec<string>;\n * const bytes = codec.encode('hello');\n * const value = codec.decode(bytes); // 'hello'\n * ```\n *\n * @remarks\n * For convenience, codecs can encode looser types than they decode.\n * That is, type {@link TFrom} can be a superset of type {@link TTo}.\n * For instance, a `Codec<bigint | number, bigint>` can encode both\n * `bigint` and `number` values, but will always decode to a `bigint`.\n *\n * ```ts\n * const codec: Codec<bigint | number, bigint>;\n * const bytes = codec.encode(42);\n * const value = codec.decode(bytes); // 42n\n * ```\n *\n * It is worth noting that codecs are the union of encoders and decoders.\n * This means that a `Codec<TFrom, TTo>` can be combined from an `Encoder<TFrom>`\n * and a `Decoder<TTo>` using the {@link combineCodec} function. This is particularly\n * useful for library authors who want to expose all three types of objects to their users.\n *\n * ```ts\n * const encoder: Encoder<bigint | number>;\n * const decoder: Decoder<bigint>;\n * const codec: Codec<bigint | number, bigint> = combineCodec(encoder, decoder);\n * ```\n *\n * Aside from combining encoders and decoders, codecs can also be created from scratch using\n * the {@link createCodec} function but it is more common to compose multiple codecs together\n * using the various helpers of the `@solana/codecs` package.\n *\n * For instance, here's how you might create a `Codec` for a `Person` object type that contains\n * a `name` string and an `age` number:\n *\n * ```ts\n * import { getStructCodec, addCodecSizePrefix, getUtf8Codec, getU32Codec } from '@solana/codecs';\n *\n * type Person = { name: string; age: number };\n * const getPersonCodec = (): Codec<Person> =>\n * getStructCodec([\n * ['name', addCodecSizePrefix(getUtf8Codec(), getU32Codec())],\n * ['age', getU32Codec()],\n * ]);\n * ```\n *\n * Note that composed `Codec` types are clever enough to understand whether\n * they are fixed-size or variable-size. In the example above, `getU32Codec()` is\n * a fixed-size codec, while `addCodecSizePrefix(getUtf8Codec(), getU32Codec())`\n * is a variable-size codec. This makes the final `Person` codec a variable-size codec.\n *\n * @see {@link FixedSizeCodec}\n * @see {@link VariableSizeCodec}\n * @see {@link combineCodec}\n * @see {@link createCodec}\n */\nexport type Codec<TFrom, TTo extends TFrom = TFrom> = FixedSizeCodec<TFrom, TTo> | VariableSizeCodec<TFrom, TTo>;\n\n/**\n * Gets the encoded size of a given value in bytes using the provided encoder.\n *\n * @typeParam TFrom - The type of the value to encode.\n * @param value - The value to be encoded.\n * @param encoder - The encoder used to determine the encoded size.\n * @returns The size of the encoded value in bytes.\n *\n * @example\n * ```ts\n * const fixedSizeEncoder = { fixedSize: 4 };\n * getEncodedSize(123, fixedSizeEncoder); // Returns 4.\n *\n * const variableSizeEncoder = { getSizeFromValue: (value: string) => value.length };\n * getEncodedSize(\"hello\", variableSizeEncoder); // Returns 5.\n * ```\n *\n * @see {@link Encoder}\n */\nexport function getEncodedSize<TFrom>(\n value: TFrom,\n encoder: { fixedSize: number } | { getSizeFromValue: (value: TFrom) => number },\n): number {\n return 'fixedSize' in encoder ? encoder.fixedSize : encoder.getSizeFromValue(value);\n}\n\n/**\n * Creates an `Encoder` by filling in the missing `encode` function using the provided `write` function and\n * either the `fixedSize` property (for {@link FixedSizeEncoder | FixedSizeEncoders}) or\n * the `getSizeFromValue` function (for {@link VariableSizeEncoder | VariableSizeEncoders}).\n *\n * Instead of manually implementing `encode`, this utility leverages the existing `write` function\n * and the size helpers to generate a complete encoder. The provided `encode` method will allocate\n * a new `Uint8Array` of the correct size and use `write` to populate it.\n *\n * @typeParam TFrom - The type of the value to encode.\n * @typeParam TSize - The fixed size of the encoded value in bytes (for fixed-size encoders).\n *\n * @param encoder - An encoder object that implements `write`, but not `encode`.\n * - If the encoder has a `fixedSize` property, it is treated as a {@link FixedSizeEncoder}.\n * - Otherwise, it is treated as a {@link VariableSizeEncoder}.\n *\n * @returns A fully functional `Encoder` with both `write` and `encode` methods.\n *\n * @example\n * Creating a custom fixed-size encoder.\n * ```ts\n * const encoder = createEncoder({\n * fixedSize: 4,\n * write: (value: number, bytes, offset) => {\n * bytes.set(new Uint8Array([value]), offset);\n * return offset + 4;\n * },\n * });\n *\n * const bytes = encoder.encode(42);\n * // 0x2a000000\n * ```\n *\n * @example\n * Creating a custom variable-size encoder:\n * ```ts\n * const encoder = createEncoder({\n * getSizeFromValue: (value: string) => value.length,\n * write: (value: string, bytes, offset) => {\n * const encodedValue = new TextEncoder().encode(value);\n * bytes.set(encodedValue, offset);\n * return offset + encodedValue.length;\n * },\n * });\n *\n * const bytes = encoder.encode(\"hello\");\n * // 0x68656c6c6f\n * ```\n *\n * @remarks\n * Note that, while `createEncoder` is useful for defining more complex encoders, it is more common to compose\n * encoders together using the various helpers and primitives of the `@solana/codecs` package.\n *\n * Here are some alternative examples using codec primitives instead of `createEncoder`.\n *\n * ```ts\n * // Fixed-size encoder for unsigned 32-bit integers.\n * const encoder = getU32Encoder();\n * const bytes = encoder.encode(42);\n * // 0x2a000000\n *\n * // Variable-size encoder for 32-bytes prefixed UTF-8 strings.\n * const encoder = addEncoderSizePrefix(getUtf8Encoder(), getU32Encoder());\n * const bytes = encoder.encode(\"hello\");\n * // 0x0500000068656c6c6f\n *\n * // Variable-size encoder for custom objects.\n * type Person = { name: string; age: number };\n * const encoder: Encoder<Person> = getStructEncoder([\n * ['name', addEncoderSizePrefix(getUtf8Encoder(), getU32Encoder())],\n * ['age', getU32Encoder()],\n * ]);\n * const bytes = encoder.encode({ name: \"Bob\", age: 42 });\n * // 0x03000000426f622a000000\n * ```\n *\n * @see {@link Encoder}\n * @see {@link FixedSizeEncoder}\n * @see {@link VariableSizeEncoder}\n * @see {@link getStructEncoder}\n * @see {@link getU32Encoder}\n * @see {@link getUtf8Encoder}\n * @see {@link addEncoderSizePrefix}\n */\nexport function createEncoder<TFrom, TSize extends number>(\n encoder: Omit<FixedSizeEncoder<TFrom, TSize>, 'encode'>,\n): FixedSizeEncoder<TFrom, TSize>;\nexport function createEncoder<TFrom>(encoder: Omit<VariableSizeEncoder<TFrom>, 'encode'>): VariableSizeEncoder<TFrom>;\nexport function createEncoder<TFrom>(\n encoder: Omit<FixedSizeEncoder<TFrom>, 'encode'> | Omit<VariableSizeEncoder<TFrom>, 'encode'>,\n): Encoder<TFrom>;\nexport function createEncoder<TFrom>(\n encoder: Omit<FixedSizeEncoder<TFrom>, 'encode'> | Omit<VariableSizeEncoder<TFrom>, 'encode'>,\n): Encoder<TFrom> {\n return Object.freeze({\n ...encoder,\n encode: value => {\n const bytes = new Uint8Array(getEncodedSize(value, encoder));\n encoder.write(value, bytes, 0);\n return bytes;\n },\n });\n}\n\n/**\n * Creates a `Decoder` by filling in the missing `decode` function using the provided `read` function.\n *\n * Instead of manually implementing `decode`, this utility leverages the existing `read` function\n * and the size properties to generate a complete decoder. The provided `decode` method will read\n * from a `Uint8Array` at the given offset and return the decoded value.\n *\n * If the `fixedSize` property is provided, a {@link FixedSizeDecoder} will be created, otherwise\n * a {@link VariableSizeDecoder} will be created.\n *\n * @typeParam TTo - The type of the decoded value.\n * @typeParam TSize - The fixed size of the encoded value in bytes (for fixed-size decoders).\n *\n * @param decoder - A decoder object that implements `read`, but not `decode`.\n * - If the decoder has a `fixedSize` property, it is treated as a {@link FixedSizeDecoder}.\n * - Otherwise, it is treated as a {@link VariableSizeDecoder}.\n *\n * @returns A fully functional `Decoder` with both `read` and `decode` methods.\n *\n * @example\n * Creating a custom fixed-size decoder.\n * ```ts\n * const decoder = createDecoder({\n * fixedSize: 4,\n * read: (bytes, offset) => {\n * const value = bytes[offset];\n * return [value, offset + 4];\n * },\n * });\n *\n * const value = decoder.decode(new Uint8Array([42, 0, 0, 0]));\n * // 42\n * ```\n *\n * @example\n * Creating a custom variable-size decoder:\n * ```ts\n * const decoder = createDecoder({\n * read: (bytes, offset) => {\n * const decodedValue = new TextDecoder().decode(bytes.subarray(offset));\n * return [decodedValue, bytes.length];\n * },\n * });\n *\n * const value = decoder.decode(new Uint8Array([104, 101, 108, 108, 111]));\n * // \"hello\"\n * ```\n *\n * @remarks\n * Note that, while `createDecoder` is useful for defining more complex decoders, it is more common to compose\n * decoders together using the various helpers and primitives of the `@solana/codecs` package.\n *\n * Here are some alternative examples using codec primitives instead of `createDecoder`.\n *\n * ```ts\n * // Fixed-size decoder for unsigned 32-bit integers.\n * const decoder = getU32Decoder();\n * const value = decoder.decode(new Uint8Array([42, 0, 0, 0]));\n * // 42\n *\n * // Variable-size decoder for 32-bytes prefixed UTF-8 strings.\n * const decoder = addDecoderSizePrefix(getUtf8Decoder(), getU32Decoder());\n * const value = decoder.decode(new Uint8Array([5, 0, 0, 0, 104, 101, 108, 108, 111]));\n * // \"hello\"\n *\n * // Variable-size decoder for custom objects.\n * type Person = { name: string; age: number };\n * const decoder: Decoder<Person> = getStructDecoder([\n * ['name', addDecoderSizePrefix(getUtf8Decoder(), getU32Decoder())],\n * ['age', getU32Decoder()],\n * ]);\n * const value = decoder.decode(new Uint8Array([3, 0, 0, 0, 66, 111, 98, 42, 0, 0, 0]));\n * // { name: \"Bob\", age: 42 }\n * ```\n *\n * @see {@link Decoder}\n * @see {@link FixedSizeDecoder}\n * @see {@link VariableSizeDecoder}\n * @see {@link getStructDecoder}\n * @see {@link getU32Decoder}\n * @see {@link getUtf8Decoder}\n * @see {@link addDecoderSizePrefix}\n */\nexport function createDecoder<TTo, TSize extends number>(\n decoder: Omit<FixedSizeDecoder<TTo, TSize>, 'decode'>,\n): FixedSizeDecoder<TTo, TSize>;\nexport function createDecoder<TTo>(decoder: Omit<VariableSizeDecoder<TTo>, 'decode'>): VariableSizeDecoder<TTo>;\nexport function createDecoder<TTo>(\n decoder: Omit<FixedSizeDecoder<TTo>, 'decode'> | Omit<VariableSizeDecoder<TTo>, 'decode'>,\n): Decoder<TTo>;\nexport function createDecoder<TTo>(\n decoder: Omit<FixedSizeDecoder<TTo>, 'decode'> | Omit<VariableSizeDecoder<TTo>, 'decode'>,\n): Decoder<TTo> {\n return Object.freeze({\n ...decoder,\n decode: (bytes, offset = 0) => decoder.read(bytes, offset)[0],\n });\n}\n\n/**\n * Creates a `Codec` by filling in the missing `encode` and `decode` functions using the provided `write` and `read` functions.\n *\n * This utility combines the behavior of {@link createEncoder} and {@link createDecoder} to produce a fully functional `Codec`.\n * The `encode` method is derived from the `write` function, while the `decode` method is derived from the `read` function.\n *\n * If the `fixedSize` property is provided, a {@link FixedSizeCodec} will be created, otherwise\n * a {@link VariableSizeCodec} will be created.\n *\n * @typeParam TFrom - The type of the value to encode.\n * @typeParam TTo - The type of the decoded value.\n * @typeParam TSize - The fixed size of the encoded value in bytes (for fixed-size codecs).\n *\n * @param codec - A codec object that implements `write` and `read`, but not `encode` or `decode`.\n * - If the codec has a `fixedSize` property, it is treated as a {@link FixedSizeCodec}.\n * - Otherwise, it is treated as a {@link VariableSizeCodec}.\n *\n * @returns A fully functional `Codec` with `write`, `read`, `encode`, and `decode` methods.\n *\n * @example\n * Creating a custom fixed-size codec.\n * ```ts\n * const codec = createCodec({\n * fixedSize: 4,\n * read: (bytes, offset) => {\n * const value = bytes[offset];\n * return [value, offset + 4];\n * },\n * write: (value: number, bytes, offset) => {\n * bytes.set(new Uint8Array([value]), offset);\n * return offset + 4;\n * },\n * });\n *\n * const bytes = codec.encode(42);\n * // 0x2a000000\n * const value = codec.decode(bytes);\n * // 42\n * ```\n *\n * @example\n * Creating a custom variable-size codec:\n * ```ts\n * const codec = createCodec({\n * getSizeFromValue: (value: string) => value.length,\n * read: (bytes, offset) => {\n * const decodedValue = new TextDecoder().decode(bytes.subarray(offset));\n * return [decodedValue, bytes.length];\n * },\n * write: (value: string, bytes, offset) => {\n * const encodedValue = new TextEncoder().encode(value);\n * bytes.set(encodedValue, offset);\n * return offset + encodedValue.length;\n * },\n * });\n *\n * const bytes = codec.encode(\"hello\");\n * // 0x68656c6c6f\n * const value = codec.decode(bytes);\n * // \"hello\"\n * ```\n *\n * @remarks\n * This function effectively combines the behavior of {@link createEncoder} and {@link createDecoder}.\n * If you only need to encode or decode (but not both), consider using those functions instead.\n *\n * Here are some alternative examples using codec primitives instead of `createCodec`.\n *\n * ```ts\n * // Fixed-size codec for unsigned 32-bit integers.\n * const codec = getU32Codec();\n * const bytes = codec.encode(42);\n * // 0x2a000000\n * const value = codec.decode(bytes);\n * // 42\n *\n * // Variable-size codec for 32-bytes prefixed UTF-8 strings.\n * const codec = addCodecSizePrefix(getUtf8Codec(), getU32Codec());\n * const bytes = codec.encode(\"hello\");\n * // 0x0500000068656c6c6f\n * const value = codec.decode(bytes);\n * // \"hello\"\n *\n * // Variable-size codec for custom objects.\n * type Person = { name: string; age: number };\n * const codec: Codec<PersonInput, Person> = getStructCodec([\n * ['name', addCodecSizePrefix(getUtf8Codec(), getU32Codec())],\n * ['age', getU32Codec()],\n * ]);\n * const bytes = codec.encode({ name: \"Bob\", age: 42 });\n * // 0x03000000426f622a000000\n * const value = codec.decode(bytes);\n * // { name: \"Bob\", age: 42 }\n * ```\n *\n * @see {@link Codec}\n * @see {@link FixedSizeCodec}\n * @see {@link VariableSizeCodec}\n * @see {@link createEncoder}\n * @see {@link createDecoder}\n * @see {@link getStructCodec}\n * @see {@link getU32Codec}\n * @see {@link getUtf8Codec}\n * @see {@link addCodecSizePrefix}\n */\nexport function createCodec<TFrom, TTo extends TFrom = TFrom, TSize extends number = number>(\n codec: Omit<FixedSizeCodec<TFrom, TTo, TSize>, 'decode' | 'encode'>,\n): FixedSizeCodec<TFrom, TTo, TSize>;\nexport function createCodec<TFrom, TTo extends TFrom = TFrom>(\n codec: Omit<VariableSizeCodec<TFrom, TTo>, 'decode' | 'encode'>,\n): VariableSizeCodec<TFrom, TTo>;\nexport function createCodec<TFrom, TTo extends TFrom = TFrom>(\n codec:\n | Omit<FixedSizeCodec<TFrom, TTo>, 'decode' | 'encode'>\n | Omit<VariableSizeCodec<TFrom, TTo>, 'decode' | 'encode'>,\n): Codec<TFrom, TTo>;\nexport function createCodec<TFrom, TTo extends TFrom = TFrom>(\n codec:\n | Omit<FixedSizeCodec<TFrom, TTo>, 'decode' | 'encode'>\n | Omit<VariableSizeCodec<TFrom, TTo>, 'decode' | 'encode'>,\n): Codec<TFrom, TTo> {\n return Object.freeze({\n ...codec,\n decode: (bytes, offset = 0) => codec.read(bytes, offset)[0],\n encode: value => {\n const bytes = new Uint8Array(getEncodedSize(value, codec));\n codec.write(value, bytes, 0);\n return bytes;\n },\n });\n}\n\n/**\n * Determines whether the given codec, encoder, or decoder is fixed-size.\n *\n * A fixed-size object is identified by the presence of a `fixedSize` property.\n * If this property exists, the object is considered a {@link FixedSizeCodec},\n * {@link FixedSizeEncoder}, or {@link FixedSizeDecoder}.\n * Otherwise, it is assumed to be a {@link VariableSizeCodec},\n * {@link VariableSizeEncoder}, or {@link VariableSizeDecoder}.\n *\n * @typeParam TFrom - The type of the value to encode.\n * @typeParam TTo - The type of the decoded value.\n * @typeParam TSize - The fixed size of the encoded value in bytes.\n * @returns `true` if the object is fixed-size, `false` otherwise.\n *\n * @example\n * Checking a fixed-size encoder.\n * ```ts\n * const encoder = getU32Encoder();\n * isFixedSize(encoder); // true\n * ```\n *\n * @example\n * Checking a variable-size encoder.\n * ```ts\n * const encoder = addEncoderSizePrefix(getUtf8Encoder(), getU32Encoder());\n * isFixedSize(encoder); // false\n * ```\n *\n * @remarks\n * This function is commonly used to distinguish between fixed-size and variable-size objects at runtime.\n * If you need to enforce this distinction with type assertions, consider using {@link assertIsFixedSize}.\n *\n * @see {@link assertIsFixedSize}\n */\nexport function isFixedSize<TFrom, TSize