png-chunk-editor/dist/index.mjs.map

NPM package to read and edit chunks contained in a PNG file

{"version":3,"sources":["../src/utils.ts","../src/chunks.ts","../src/index.ts"],"sourcesContent":["export const PNG_SIG = [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a];\r\n\r\nexport function validateSignature(signature: number[]): boolean {\r\n  return signature.slice(0, 8).every((val, index) => val === PNG_SIG[index]);\r\n}\r\n\r\nconst CRC32_TABLE = [\r\n  0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,\r\n  0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,\r\n  0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,\r\n  0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,\r\n  0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,\r\n  0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,\r\n  0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,\r\n  0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,\r\n  0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,\r\n  0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,\r\n  0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,\r\n  0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,\r\n  0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,\r\n  0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,\r\n  0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,\r\n  0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,\r\n  0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,\r\n  0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,\r\n  0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,\r\n  0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,\r\n  0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,\r\n  0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,\r\n  0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,\r\n  0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,\r\n  0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,\r\n  0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,\r\n  0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,\r\n  0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,\r\n  0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,\r\n  0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,\r\n  0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,\r\n  0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,\r\n  0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,\r\n  0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,\r\n  0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,\r\n  0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,\r\n  0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,\r\n  0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,\r\n  0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,\r\n  0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,\r\n  0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,\r\n  0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,\r\n  0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,\r\n];\r\n\r\nexport function crc32(bytes: number[]): number {\r\n  let crc = 0 ^ -1;\r\n  for (let i = 0; i < bytes.length; i++) {\r\n    crc = (crc >>> 8) ^ CRC32_TABLE[(crc ^ bytes[i]) & 0xff];\r\n  }\r\n  return (crc ^ -1) >>> 0;\r\n}\r\n\r\nexport function bytesToInteger(bytes: number[]): number {\r\n  let v = 0;\r\n  for (let i = 0; i < bytes.length; i++) {\r\n    v = (v << 8) | (bytes[i] & 0xff);\r\n  }\r\n  return v;\r\n}\r\n\r\nexport function integerToBytes(value: number, size: number): number[] {\r\n  if (!Number.isInteger(value)) {\r\n    throw Error(`${value} is not integer.`);\r\n  }\r\n  const bytes: number[] = [];\r\n  while (size >= 1) {\r\n    bytes[--size] = value & 0xff;\r\n    value >>= 8;\r\n  }\r\n  return bytes;\r\n}\r\n\r\nexport function bytesToString(bytes: number[]): string {\r\n  return bytes.map((value) => String.fromCharCode(value)).join(\"\");\r\n}\r\n\r\nexport function stringToBytes(s: string): number[] {\r\n  // TODO only supports ASCII characters for now (< 128)\r\n  const bytes: number[] = [];\r\n  for (let i = 0; i < s.length; i++) {\r\n    const code = s.charCodeAt(i);\r\n    if (code > 127) {\r\n      throw Error(`Invalid character in string \"${s}\" at position ${i}.`);\r\n    }\r\n    bytes.push(code);\r\n  }\r\n  return bytes;\r\n}\r\n","import {\r\n  bytesToInteger,\r\n  bytesToString,\r\n  crc32,\r\n  integerToBytes,\r\n  stringToBytes,\r\n} from \"./utils\";\r\n\r\nexport function* chunksFromBytes(\r\n  _bytes: number[],\r\n  noVerifyCrc?: boolean\r\n): Generator<PNGChunk_bytes> {\r\n  // skip signature\r\n  let bytes = _bytes.slice(8);\r\n\r\n  // read chunks\r\n  while (bytes.length >= 12) {\r\n    const chunk = PNGChunk_bytes.fromBytes(bytes, noVerifyCrc);\r\n    yield chunk;\r\n    bytes = bytes.slice(chunk.sizeTotal());\r\n  }\r\n}\r\n\r\nexport abstract class PNGChunk {\r\n  abstract size(): number;\r\n  abstract dataBytes(): number[];\r\n\r\n  readonly typeStr: string;\r\n  readonly typeBytes: number[];\r\n\r\n  constructor(type: string) {\r\n    // check type length\r\n    if (type.length !== 4) {\r\n      throw Error(`Invalid type \"${type}\". Must be 4 characters.`);\r\n    }\r\n\r\n    // check that type contains only valid chunk type characters\r\n    const typeBytes = stringToBytes(type);\r\n    for (let i = 0; i < typeBytes.length; i++) {\r\n      const code = typeBytes[i];\r\n      if (!((code > 64 && code < 91) || (code > 96 && code < 123))) {\r\n        throw Error(`Invalid character in type \"${type}\" at position ${i}.`);\r\n      }\r\n    }\r\n\r\n    this.typeStr = type;\r\n    this.typeBytes = typeBytes;\r\n  }\r\n\r\n  crc(): number {\r\n    return crc32([...this.typeBytes, ...this.dataBytes()]);\r\n  }\r\n\r\n  sizeTotal(): number {\r\n    return this.size() + 12;\r\n  }\r\n\r\n  toBytes(): number[] {\r\n    return [\r\n      ...integerToBytes(this.size(), 4),\r\n      ...this.typeBytes,\r\n      ...this.dataBytes(),\r\n      ...integerToBytes(this.crc(), 4),\r\n    ];\r\n  }\r\n\r\n  into<T>(into: { typeStr: string; fromDataBytes: (data: number[]) => T }): T {\r\n    if (this.typeStr !== into.typeStr) {\r\n      throw Error(`Invalid type ${this.typeStr} != ${into.typeStr}.`);\r\n    }\r\n    return into.fromDataBytes(this.dataBytes());\r\n  }\r\n}\r\n\r\nexport class PNGChunk_bytes extends PNGChunk {\r\n  data: number[];\r\n\r\n  constructor(type: string, data: number[]) {\r\n    super(type);\r\n    this.data = data;\r\n  }\r\n\r\n  dataBytes(): number[] {\r\n    return this.data;\r\n  }\r\n\r\n  size(): number {\r\n    return this.data.length;\r\n  }\r\n\r\n  static fromBytes(bytes: number[], noVerifyCrc?: boolean): PNGChunk_bytes {\r\n    let i = 0;\r\n\r\n    // read size (treat negative size like 0)\r\n    const size = Math.max(bytesToInteger(bytes.slice(i, i + 4)), 0);\r\n    i += 4;\r\n\r\n    // read type\r\n    const type = bytes.slice(i, i + 4);\r\n    const typeStr = bytesToString(type);\r\n    i += 4;\r\n\r\n    // read data\r\n    const data = bytes.slice(i, i + size);\r\n    i += size;\r\n\r\n    // verify CRC\r\n    if (noVerifyCrc !== true) {\r\n      const crc = bytesToInteger(bytes.slice(i, i + 4)) >>> 0;\r\n      i += 4;\r\n      if (crc !== crc32([...type, ...data])) {\r\n        throw Error(`invalid CRC in chunk ${typeStr}`);\r\n      }\r\n    }\r\n\r\n    return new PNGChunk_bytes(typeStr, data);\r\n  }\r\n}\r\n\r\nexport class PNGChunk_tEXt extends PNGChunk {\r\n  static typeStr = \"tEXt\";\r\n  keyword: string;\r\n  text: string;\r\n\r\n  constructor(keyword: string, text: string) {\r\n    super(PNGChunk_tEXt.typeStr);\r\n    this.keyword = keyword;\r\n    this.text = text;\r\n  }\r\n\r\n  dataBytes(): number[] {\r\n    // TODO check encoding / valid characters\r\n    const data = [\r\n      ...stringToBytes(this.keyword),\r\n      0 & 0xff,\r\n      ...stringToBytes(this.text),\r\n    ];\r\n    return data;\r\n  }\r\n\r\n  size(): number {\r\n    return this.keyword.length + this.text.length + 1;\r\n  }\r\n\r\n  static fromDataBytes(data: number[]): PNGChunk_tEXt {\r\n    // find separator byte\r\n    const separatorIndex = data.findIndex((byte) => byte === 0);\r\n    if (separatorIndex === undefined) {\r\n      throw Error(\"Could not find separator byte.\");\r\n    }\r\n\r\n    // read keyword and text\r\n    const keyword = bytesToString(data.slice(0, separatorIndex));\r\n    const text = bytesToString(data.slice(separatorIndex + 1, data.length));\r\n\r\n    return new PNGChunk_tEXt(keyword, text);\r\n  }\r\n}\r\n","import {\r\n  chunksFromBytes,\r\n  type PNGChunk,\r\n  PNGChunk_bytes,\r\n  PNGChunk_tEXt,\r\n} from \"./chunks\";\r\nimport { PNG_SIG, validateSignature } from \"./utils\";\r\n\r\nexport { PNGChunk_bytes, PNGChunk_tEXt };\r\n\r\nexport class PNGImage {\r\n  chunks: PNGChunk[];\r\n\r\n  constructor(chunks: PNGChunk[]) {\r\n    this.chunks = chunks;\r\n  }\r\n\r\n  insertChunk(chunk: PNGChunk, index?: number): void {\r\n    if (index === undefined) {\r\n      this.chunks.push(chunk);\r\n    } else {\r\n      this.chunks.splice(index, 0, chunk);\r\n    }\r\n  }\r\n\r\n  getChunk(index: number): PNGChunk {\r\n    return this.chunks[index];\r\n  }\r\n\r\n  getChunkIndex(type: string): number | undefined {\r\n    for (let i = 0; i < this.chunks.length; i++) {\r\n      if (this.chunks[i].typeStr === type) {\r\n        return i;\r\n      }\r\n    }\r\n  }\r\n\r\n  toBytes(): number[] {\r\n    return [...PNG_SIG, ...this.chunks.flatMap((chunk) => chunk.toBytes())];\r\n  }\r\n\r\n  static fromBytes(bytes: number[]): PNGImage {\r\n    // validate signature\r\n    if (!validateSignature(bytes.slice(0, 8))) {\r\n      throw Error(\"Invalid PNG signature.\");\r\n    }\r\n\r\n    // read chunks\r\n    const chunks = Array.from(chunksFromBytes(bytes));\r\n\r\n    return new PNGImage(chunks);\r\n  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