@cartbc/codecs-strings/src/index.node.cjs.map

Codecs for strings of different sizes and encodings

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It also supports leading zeroes by using the\n * first character of the alphabet as the zero character.\n *\n * This can be used to create codecs such as base10 or base58.\n */\nexport const getBaseXCodec = (alphabet: string): Codec<string> =>\n    combineCodec(getBaseXEncoder(alphabet), getBaseXDecoder(alphabet));\n","import { getBaseXCodec, getBaseXDecoder, getBaseXEncoder } from './baseX';\n\nconst alphabet = '0123456789';\n\n/** Encodes strings in base10. */\nexport const getBase10Encoder = () => getBaseXEncoder(alphabet);\n\n/** Decodes strings in base10. */\nexport const getBase10Decoder = () => getBaseXDecoder(alphabet);\n\n/** Encodes and decodes strings in base10. */\nexport const getBase10Codec = () => getBaseXCodec(alphabet);\n","import { Codec, combineCodec, Decoder, Encoder } from '@cartbc/codecs-core';\n\nimport { assertValidBaseString } from './assertions';\n\n/** Encodes strings in base16. */\nexport const getBase16Encoder = (): Encoder<string> => ({\n    description: 'base16',\n    encode(value: string) {\n        const lowercaseValue = value.toLowerCase();\n        assertValidBaseString('0123456789abcdef', lowercaseValue, value);\n        const matches = lowercaseValue.match(/.{1,2}/g);\n        return Uint8Array.from(matches ? matches.map((byte: string) => parseInt(byte, 16)) : []);\n    },\n    fixedSize: null,\n    maxSize: null,\n});\n\n/** Decodes strings in base16. */\nexport const getBase16Decoder = (): Decoder<string> => ({\n    decode(bytes, offset = 0) {\n        const value = bytes.slice(offset).reduce((str, byte) => str + byte.toString(16).padStart(2, '0'), '');\n        return [value, bytes.length];\n    },\n    description: 'base16',\n    fixedSize: null,\n    maxSize: null,\n});\n\n/** Encodes and decodes strings in base16. */\nexport const getBase16Codec = (): Codec<string> => combineCodec(getBase16Encoder(), getBase16Decoder());\n","import { getBaseXCodec, getBaseXDecoder, getBaseXEncoder } from './baseX';\n\nconst alphabet = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz';\n\n/** Encodes strings in base58. */\nexport const getBase58Encoder = () => getBaseXEncoder(alphabet);\n\n/** Decodes strings in base58. */\nexport const getBase58Decoder = () => getBaseXDecoder(alphabet);\n\n/** Encodes and decodes strings in base58. */\nexport const getBase58Codec = () => getBaseXCodec(alphabet);\n","import { combineCodec, Decoder, Encoder, mapDecoder, mapEncoder } from '@cartbc/codecs-core';\n\nimport { assertValidBaseString } from './assertions';\nimport { getBaseXResliceDecoder, getBaseXResliceEncoder } from './baseX-reslice';\n\nconst alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';\n\n/** Encodes strings in base64. */\nexport const getBase64Encoder = (): Encoder<string> => {\n    if (__BROWSER__) {\n        return {\n            description: `base64`,\n            encode(value: string): Uint8Array {\n                try {\n                    const bytes = (atob as Window['atob'])(value)\n                        .split('')\n                        .map(c => c.charCodeAt(0));\n                    return new Uint8Array(bytes);\n                } catch (e) {\n                    // TODO: Coded error.\n                    throw new Error(`Expected a string of base 64, got [${value}].`);\n                }\n            },\n            fixedSize: null,\n            maxSize: null,\n        };\n    }\n\n    if (__NODEJS__) {\n        return {\n            description: `base64`,\n            encode(value: string): Uint8Array {\n                assertValidBaseString(alphabet, value.replace(/=/g, ''));\n                return new Uint8Array(Buffer.from(value, 'base64'));\n            },\n            fixedSize: null,\n            maxSize: null,\n        };\n    }\n\n    return mapEncoder(getBaseXResliceEncoder(alphabet, 6), (value: string): string => value.replace(/=/g, ''));\n};\n\n/** Decodes strings in base64. */\nexport const getBase64Decoder = (): Decoder<string> => {\n    if (__BROWSER__) {\n        return {\n            decode(bytes, offset = 0) {\n                const slice = bytes.slice(offset);\n                const value = (btoa as Window['btoa'])(String.fromCharCode(...slice));\n                return [value, bytes.length];\n            },\n            description: `base64`,\n            fixedSize: null,\n            maxSize: null,\n        };\n    }\n\n    if (__NODEJS__) {\n        return {\n            decode: (bytes, offset = 0) => [Buffer.from(bytes, offset).toString('base64'), bytes.length],\n            description: `base64`,\n            fixedSize: null,\n            maxSize: null,\n        };\n    }\n\n    return mapDecoder(getBaseXResliceDecoder(alphabet, 6), (value: string): string =>\n        value.padEnd(Math.ceil(value.length / 4) * 4, '=')\n    );\n};\n\n/** Encodes and decodes strings in base64. */\nexport const getBase64Codec = () => combineCodec(getBase64Encoder(), getBase64Decoder());\n","import { Codec, combineCodec, Decoder, Encoder } from '@cartbc/codecs-core';\n\nimport { assertValidBaseString } from './assertions';\n\n/**\n * Encodes a string using a custom alphabet by reslicing the bits of the byte array.\n * @see {@link getBaseXResliceCodec} for a more detailed description.\n */\nexport const getBaseXResliceEncoder = (alphabet: string, bits: number): Encoder<string> => ({\n    description: `base${alphabet.length}`,\n    encode(value: string): Uint8Array {\n        assertValidBaseString(alphabet, value);\n        if (value === '') return new Uint8Array();\n        const charIndices = [...value].map(c => alphabet.indexOf(c));\n        return new Uint8Array(reslice(charIndices, bits, 8, false));\n    },\n    fixedSize: null,\n    maxSize: null,\n});\n\n/**\n * Decodes a string using a custom alphabet by reslicing the bits of the byte array.\n * @see {@link getBaseXResliceCodec} for a more detailed description.\n */\nexport const getBaseXResliceDecoder = (alphabet: string, bits: number): Decoder<string> => ({\n    decode(rawBytes, offset = 0): [string, number] {\n        const bytes = offset === 0 ? rawBytes : rawBytes.slice(offset);\n        if (bytes.length === 0) return ['', rawBytes.length];\n        const charIndices = reslice([...bytes], 8, bits, true);\n        return [charIndices.map(i => alphabet[i]).join(''), rawBytes.length];\n    },\n    description: `base${alphabet.length}`,\n    fixedSize: null,\n    maxSize: null,\n});\n\n/**\n * A string serializer that reslices bytes into custom chunks\n * of bits that are then mapped to a custom alphabet.\n *\n * This can be used to create serializers whose alphabet\n * is a power of 2 such as base16 or base64.\n */\nexport const getBaseXResliceCodec = (alphabet: string, bits: number): Codec<string> =>\n    combineCodec(getBaseXResliceEncoder(alphabet, bits), getBaseXResliceDecoder(alphabet, bits));\n\n/** Helper function to reslice the bits inside bytes. */\nfunction reslice(input: number[], inputBits: number, outputBits: number, useRemainder: boolean): number[] {\n    const output = [];\n    let accumulator = 0;\n    let bitsInAccumulator = 0;\n    const mask = (1 << outputBits) - 1;\n    for (const value of input) {\n        accumulator = (accumulator << inputBits) | value;\n        bitsInAccumulator += inputBits;\n        while (bitsInAccumulator >= outputBits) {\n            bitsInAccumulator -= outputBits;\n            output.push((accumulator >> bitsInAccumulator) & mask);\n        }\n    }\n    if (useRemainder && bitsInAccumulator > 0) {\n        output.push((accumulator << (outputBits - bitsInAccumulator)) & mask);\n    }\n    return output;\n}\n","/**Removes null characters from a string. */\nexport const removeNullCharacters = (value: string) =>\n    // eslint-disable-next-line no-control-regex\n    value.replace(/\\u0000/g, '');\n\n/** Pads a string with null characters at the end. */\nexport const padNullCharacters = (value: string, chars: number) => value.padEnd(chars, '\\u0000');\n","import {\n    assertByteArrayHasEnoughBytesForCodec,\n    assertByteArrayIsNotEmptyForCodec,\n    BaseCodecOptions,\n    Codec,\n    CodecData,\n    combineCodec,\n    Decoder,\n    Encoder,\n    fixDecoder,\n    fixEncoder,\n    mergeBytes,\n} from '@cartbc/codecs-core';\nimport { getU32Decoder, getU32Encoder, NumberCodec, NumberDecoder, NumberEncoder } from '@cartbc/codecs-numbers';\n\nimport { getUtf8Decoder, getUtf8Encoder } from './utf8';\n\n/** Defines the options for string codecs. */\nexport type StringCodecOptions<\n    TPrefix extends NumberCodec | NumberEncoder | NumberDecoder,\n    TEncoding extends Codec<string> | Encoder<string> | Decoder<string>\n> = BaseCodecOptions & {\n    /**\n     * The size of the string. It can be one of the following:\n     * - a {@link NumberCodec} that prefixes the string with its size.\n     * - a fixed number of bytes.\n     * - or `'variable'` to use the rest of the byte array.\n     * @defaultValue u32 prefix.\n     */\n    size?: TPrefix | number | 'variable';\n\n    /**\n     * The codec to use for encoding and decoding the content.\n     * @defaultValue UTF-8 encoding.\n     */\n    encoding?: TEncoding;\n};\n\n/** Encodes strings from a given encoding and size strategy. */\nexport const getStringEncoder = (options: StringCodecOptions<NumberEncoder, Encoder<string>> = {}): Encoder<string> => {\n    const size = options.size ?? getU32Encoder();\n    const encoding = options.encoding ?? getUtf8Encoder();\n    const description = options.description ?? `string(${encoding.description}; ${getSizeDescription(size)})`;\n\n    if (size === 'variable') {\n        return { ...encoding, description };\n    }\n\n    if (typeof size === 'number') {\n        return fixEncoder(encoding, size, description);\n    }\n\n    return {\n        description,\n        encode: (value: string) => {\n            const contentBytes = encoding.encode(value);\n            const lengthBytes = size.encode(contentBytes.length);\n            return mergeBytes([lengthBytes, contentBytes]);\n        },\n        fixedSize: null,\n        maxSize: null,\n    };\n};\n\n/** Decodes strings from a given encoding and size strategy. */\nexport const getStringDecoder = (options: StringCodecOptions<NumberDecoder, Decoder<string>> = {}): Decoder<string> => {\n    const size = options.size ?? getU32Decoder();\n    const encoding = options.encoding ?? getUtf8Decoder();\n    const description = options.description ?? `string(${encoding.description}; ${getSizeDescription(size)})`;\n\n    if (size === 'variable') {\n        return { ...encoding, description };\n    }\n\n    if (typeof size === 'number') {\n        return fixDecoder(encoding, size, description);\n    }\n\n    return {\n        decode: (bytes: Uint8Array, offset = 0) => {\n            assertByteArrayIsNotEmptyForCodec('string', bytes, offset);\n            const [lengthBigInt, lengthOffset] = size.decode(bytes, offset);\n            const length = Number(lengthBigInt);\n            offset = lengthOffset;\n            const contentBytes = bytes.slice(offset, offset + length);\n            assertByteArrayHasEnoughBytesForCodec('string', length, contentBytes);\n            const [value, contentOffset] = encoding.decode(contentBytes);\n            offset += contentOffset;\n            return [value, offset];\n        },\n        description,\n        fixedSize: null,\n        maxSize: null,\n    };\n};\n\n/** Encodes and decodes strings from a given encoding and size strategy. */\nexport const getStringCodec = (options: StringCodecOptions<NumberCodec, Codec<string>> = {}): Codec<string> =>\n    combineCodec(getStringEncoder(options), getStringDecoder(options));\n\nfunction getSizeDescription(size: CodecData | number | 'variable'): string {\n    return typeof size === 'object' ? size.description : `${size}`;\n}\n","import { Codec, combineCodec, Decoder, Encoder } from '@cartbc/codecs-core';\nimport { TextDecoder, TextEncoder } from 'text-encoding-impl';\n\nimport { removeNullCharacters } from './null-characters';\n\n/** Encodes UTF-8 strings using the native `TextEncoder` API. */\nexport const getUtf8Encoder = (): Encoder<string> => {\n    let textEncoder: TextEncoder;\n    return {\n        description: 'utf8',\n        encode: (value: string) => new Uint8Array((textEncoder ||= new TextEncoder()).encode(value)),\n        fixedSize: null,\n        maxSize: null,\n    };\n};\n\n/** Decodes UTF-8 strings using the native `TextDecoder` API. */\nexport const getUtf8Decoder = (): Decoder<string> => {\n    let textDecoder: TextDecoder;\n    return {\n        decode(bytes, offset = 0) {\n            const value = (textDecoder ||= new TextDecoder()).decode(bytes.slice(offset));\n            return [removeNullCharacters(value), bytes.length];\n        },\n        description: 'utf8',\n        fixedSize: null,\n        maxSize: null,\n    };\n};\n\n/** Encodes and decodes UTF-8 strings using the native `TextEncoder` and `TextDecoder` API. */\nexport const getUtf8Codec = (): Codec<string> => combineCodec(getUtf8Encoder(), getUtf8Decoder());\n","export const TextDecoder = globalThis.TextDecoder;\nexport const TextEncoder = globalThis.TextEncoder;\n"]}