image-size/dist/detector.mjs

get dimensions of any image file

// lib/types/utils.ts
var decoder = new TextDecoder();
var toUTF8String = (input, start = 0, end = input.length) => decoder.decode(input.slice(start, end));
var toHexString = (input, start = 0, end = input.length) => input.slice(start, end).reduce((memo, i) => memo + `0${i.toString(16)}`.slice(-2), "");
var getView = (input, offset) => new DataView(input.buffer, input.byteOffset + offset);
var readInt16LE = (input, offset = 0) => getView(input, offset).getInt16(0, true);
var readUInt16BE = (input, offset = 0) => getView(input, offset).getUint16(0, false);
var readUInt16LE = (input, offset = 0) => getView(input, offset).getUint16(0, true);
var readUInt24LE = (input, offset = 0) => {
  const view = getView(input, offset);
  return view.getUint16(0, true) + (view.getUint8(2) << 16);
};
var readInt32LE = (input, offset = 0) => getView(input, offset).getInt32(0, true);
var readUInt32BE = (input, offset = 0) => getView(input, offset).getUint32(0, false);
var readUInt32LE = (input, offset = 0) => getView(input, offset).getUint32(0, true);
var readUInt64 = (input, offset, isBigEndian) => getView(input, offset).getBigUint64(0, !isBigEndian);
var methods = {
  readUInt16BE,
  readUInt16LE,
  readUInt32BE,
  readUInt32LE
};
function readUInt(input, bits, offset = 0, isBigEndian = false) {
  const endian = isBigEndian ? "BE" : "LE";
  const methodName = `readUInt${bits}${endian}`;
  return methods[methodName](input, offset);
}
function readBox(input, offset) {
  if (input.length - offset < 4) return;
  const boxSize = readUInt32BE(input, offset);
  if (input.length - offset < boxSize) return;
  return {
    name: toUTF8String(input, 4 + offset, 8 + offset),
    offset,
    size: boxSize
  };
}
function findBox(input, boxName, currentOffset) {
  while (currentOffset < input.length) {
    const box = readBox(input, currentOffset);
    if (!box) break;
    if (box.name === boxName) return box;
    currentOffset += box.size > 0 ? box.size : 8;
  }
}

// lib/types/bmp.ts
var BMP = {
  validate: (input) => toUTF8String(input, 0, 2) === "BM",
  calculate: (input) => ({
    height: Math.abs(readInt32LE(input, 22)),
    width: readUInt32LE(input, 18)
  })
};

// lib/types/ico.ts
var TYPE_ICON = 1;
var SIZE_HEADER = 2 + 2 + 2;
var SIZE_IMAGE_ENTRY = 1 + 1 + 1 + 1 + 2 + 2 + 4 + 4;
function getSizeFromOffset(input, offset) {
  const value = input[offset];
  return value === 0 ? 256 : value;
}
function getImageSize(input, imageIndex) {
  const offset = SIZE_HEADER + imageIndex * SIZE_IMAGE_ENTRY;
  return {
    height: getSizeFromOffset(input, offset + 1),
    width: getSizeFromOffset(input, offset)
  };
}
var ICO = {
  validate(input) {
    const reserved = readUInt16LE(input, 0);
    const imageCount = readUInt16LE(input, 4);
    if (reserved !== 0 || imageCount === 0) return false;
    const imageType = readUInt16LE(input, 2);
    return imageType === TYPE_ICON;
  },
  calculate(input) {
    const nbImages = readUInt16LE(input, 4);
    const imageSize = getImageSize(input, 0);
    if (nbImages === 1) return imageSize;
    const images = [];
    for (let imageIndex = 0; imageIndex < nbImages; imageIndex += 1) {
      images.push(getImageSize(input, imageIndex));
    }
    return {
      width: imageSize.width,
      height: imageSize.height,
      images
    };
  }
};

// lib/types/cur.ts
var TYPE_CURSOR = 2;
var CUR = {
  validate(input) {
    const reserved = readUInt16LE(input, 0);
    const imageCount = readUInt16LE(input, 4);
    if (reserved !== 0 || imageCount === 0) return false;
    const imageType = readUInt16LE(input, 2);
    return imageType === TYPE_CURSOR;
  },
  calculate: (input) => ICO.calculate(input)
};

// lib/types/dds.ts
var DDS = {
  validate: (input) => readUInt32LE(input, 0) === 542327876,
  calculate: (input) => ({
    height: readUInt32LE(input, 12),
    width: readUInt32LE(input, 16)
  })
};

// lib/types/gif.ts
var gifRegexp = /^GIF8[79]a/;
var GIF = {
  validate: (input) => gifRegexp.test(toUTF8String(input, 0, 6)),
  calculate: (input) => ({
    height: readUInt16LE(input, 8),
    width: readUInt16LE(input, 6)
  })
};

// lib/types/heif.ts
var brandMap = {
  avif: "avif",
  mif1: "heif",
  msf1: "heif",
  // heif-sequence
  heic: "heic",
  heix: "heic",
  hevc: "heic",
  // heic-sequence
  hevx: "heic"
  // heic-sequence
};
var HEIF = {
  validate(input) {
    const boxType = toUTF8String(input, 4, 8);
    if (boxType !== "ftyp") return false;
    const ftypBox = findBox(input, "ftyp", 0);
    if (!ftypBox) return false;
    const brand = toUTF8String(input, ftypBox.offset + 8, ftypBox.offset + 12);
    return brand in brandMap;
  },
  calculate(input) {
    const metaBox = findBox(input, "meta", 0);
    const iprpBox = metaBox && findBox(input, "iprp", metaBox.offset + 12);
    const ipcoBox = iprpBox && findBox(input, "ipco", iprpBox.offset + 8);
    if (!ipcoBox) {
      throw new TypeError("Invalid HEIF, no ipco box found");
    }
    const type = toUTF8String(input, 8, 12);
    const images = [];
    let currentOffset = ipcoBox.offset + 8;
    while (currentOffset < ipcoBox.offset + ipcoBox.size) {
      const ispeBox = findBox(input, "ispe", currentOffset);
      if (!ispeBox) break;
      const rawWidth = readUInt32BE(input, ispeBox.offset + 12);
      const rawHeight = readUInt32BE(input, ispeBox.offset + 16);
      const clapBox = findBox(input, "clap", currentOffset);
      let width = rawWidth;
      let height = rawHeight;
      if (clapBox && clapBox.offset < ipcoBox.offset + ipcoBox.size) {
        const cropRight = readUInt32BE(input, clapBox.offset + 12);
        width = rawWidth - cropRight;
      }
      images.push({ height, width });
      currentOffset = ispeBox.offset + ispeBox.size;
    }
    if (images.length === 0) {
      throw new TypeError("Invalid HEIF, no sizes found");
    }
    return {
      width: images[0].width,
      height: images[0].height,
      type,
      ...images.length > 1 ? { images } : {}
    };
  }
};

// lib/types/icns.ts
var SIZE_HEADER2 = 4 + 4;
var FILE_LENGTH_OFFSET = 4;
var ENTRY_LENGTH_OFFSET = 4;
var ICON_TYPE_SIZE = {
  ICON: 32,
  "ICN#": 32,
  // m => 16 x 16
  "icm#": 16,
  icm4: 16,
  icm8: 16,
  // s => 16 x 16
  "ics#": 16,
  ics4: 16,
  ics8: 16,
  is32: 16,
  s8mk: 16,
  icp4: 16,
  // l => 32 x 32
  icl4: 32,
  icl8: 32,
  il32: 32,
  l8mk: 32,
  icp5: 32,
  ic11: 32,
  // h => 48 x 48
  ich4: 48,
  ich8: 48,
  ih32: 48,
  h8mk: 48,
  // . => 64 x 64
  icp6: 64,
  ic12: 32,
  // t => 128 x 128
  it32: 128,
  t8mk: 128,
  ic07: 128,
  // . => 256 x 256
  ic08: 256,
  ic13: 256,
  // . => 512 x 512
  ic09: 512,
  ic14: 512,
  // . => 1024 x 1024
  ic10: 1024
};
function readImageHeader(input, imageOffset) {
  const imageLengthOffset = imageOffset + ENTRY_LENGTH_OFFSET;
  return [
    toUTF8String(input, imageOffset, imageLengthOffset),
    readUInt32BE(input, imageLengthOffset)
  ];
}
function getImageSize2(type) {
  const size = ICON_TYPE_SIZE[type];
  return { width: size, height: size, type };
}
var ICNS = {
  validate: (input) => toUTF8String(input, 0, 4) === "icns",
  calculate(input) {
    const inputLength = input.length;
    const fileLength = readUInt32BE(input, FILE_LENGTH_OFFSET);
    let imageOffset = SIZE_HEADER2;
    const images = [];
    while (imageOffset < fileLength && imageOffset < inputLength) {
      const imageHeader = readImageHeader(input, imageOffset);
      const imageSize = getImageSize2(imageHeader[0]);
      images.push(imageSize);
      imageOffset += imageHeader[1];
    }
    if (images.length === 0) {
      throw new TypeError("Invalid ICNS, no sizes found");
    }
    return {
      width: images[0].width,
      height: images[0].height,
      ...images.length > 1 ? { images } : {}
    };
  }
};

// lib/types/j2c.ts
var J2C = {
  // TODO: this doesn't seem right. SIZ marker doesn't have to be right after the SOC
  validate: (input) => readUInt32BE(input, 0) === 4283432785,
  calculate: (input) => ({
    height: readUInt32BE(input, 12),
    width: readUInt32BE(input, 8)
  })
};

// lib/types/jp2.ts
var JP2 = {
  validate(input) {
    const boxType = toUTF8String(input, 4, 8);
    if (boxType !== "jP  ") return false;
    const ftypBox = findBox(input, "ftyp", 0);
    if (!ftypBox) return false;
    const brand = toUTF8String(input, ftypBox.offset + 8, ftypBox.offset + 12);
    return brand === "jp2 ";
  },
  calculate(input) {
    const jp2hBox = findBox(input, "jp2h", 0);
    const ihdrBox = jp2hBox && findBox(input, "ihdr", jp2hBox.offset + 8);
    if (ihdrBox) {
      return {
        height: readUInt32BE(input, ihdrBox.offset + 8),
        width: readUInt32BE(input, ihdrBox.offset + 12)
      };
    }
    throw new TypeError("Unsupported JPEG 2000 format");
  }
};

// lib/types/jpg.ts
var EXIF_MARKER = "45786966";
var APP1_DATA_SIZE_BYTES = 2;
var EXIF_HEADER_BYTES = 6;
var TIFF_BYTE_ALIGN_BYTES = 2;
var BIG_ENDIAN_BYTE_ALIGN = "4d4d";
var LITTLE_ENDIAN_BYTE_ALIGN = "4949";
var IDF_ENTRY_BYTES = 12;
var NUM_DIRECTORY_ENTRIES_BYTES = 2;
function isEXIF(input) {
  return toHexString(input, 2, 6) === EXIF_MARKER;
}
function extractSize(input, index) {
  return {
    height: readUInt16BE(input, index),
    width: readUInt16BE(input, index + 2)
  };
}
function extractOrientation(exifBlock, isBigEndian) {
  const idfOffset = 8;
  const offset = EXIF_HEADER_BYTES + idfOffset;
  const idfDirectoryEntries = readUInt(exifBlock, 16, offset, isBigEndian);
  for (let directoryEntryNumber = 0; directoryEntryNumber < idfDirectoryEntries; directoryEntryNumber++) {
    const start = offset + NUM_DIRECTORY_ENTRIES_BYTES + directoryEntryNumber * IDF_ENTRY_BYTES;
    const end = start + IDF_ENTRY_BYTES;
    if (start > exifBlock.length) {
      return;
    }
    const block = exifBlock.slice(start, end);
    const tagNumber = readUInt(block, 16, 0, isBigEndian);
    if (tagNumber === 274) {
      const dataFormat = readUInt(block, 16, 2, isBigEndian);
      if (dataFormat !== 3) {
        return;
      }
      const numberOfComponents = readUInt(block, 32, 4, isBigEndian);
      if (numberOfComponents !== 1) {
        return;
      }
      return readUInt(block, 16, 8, isBigEndian);
    }
  }
}
function validateExifBlock(input, index) {
  const exifBlock = input.slice(APP1_DATA_SIZE_BYTES, index);
  const byteAlign = toHexString(
    exifBlock,
    EXIF_HEADER_BYTES,
    EXIF_HEADER_BYTES + TIFF_BYTE_ALIGN_BYTES
  );
  const isBigEndian = byteAlign === BIG_ENDIAN_BYTE_ALIGN;
  const isLittleEndian = byteAlign === LITTLE_ENDIAN_BYTE_ALIGN;
  if (isBigEndian || isLittleEndian) {
    return extractOrientation(exifBlock, isBigEndian);
  }
}
function validateInput(input, index) {
  if (index > input.length) {
    throw new TypeError("Corrupt JPG, exceeded buffer limits");
  }
}
var JPG = {
  validate: (input) => toHexString(input, 0, 2) === "ffd8",
  calculate(_input) {
    let input = _input.slice(4);
    let orientation;
    let next;
    while (input.length) {
      const i = readUInt16BE(input, 0);
      validateInput(input, i);
      if (input[i] !== 255) {
        input = input.slice(1);
        continue;
      }
      if (isEXIF(input)) {
        orientation = validateExifBlock(input, i);
      }
      next = input[i + 1];
      if (next === 192 || next === 193 || next === 194) {
        const size = extractSize(input, i + 5);
        if (!orientation) {
          return size;
        }
        return {
          height: size.height,
          orientation,
          width: size.width
        };
      }
      input = input.slice(i + 2);
    }
    throw new TypeError("Invalid JPG, no size found");
  }
};

// lib/utils/bit-reader.ts
var BitReader = class {
  constructor(input, endianness) {
    this.input = input;
    this.endianness = endianness;
    // Skip the first 16 bits (2 bytes) of signature
    this.byteOffset = 2;
    this.bitOffset = 0;
  }
  /** Reads a specified number of bits, and move the offset */
  getBits(length = 1) {
    let result = 0;
    let bitsRead = 0;
    while (bitsRead < length) {
      if (this.byteOffset >= this.input.length) {
        throw new Error("Reached end of input");
      }
      const currentByte = this.input[this.byteOffset];
      const bitsLeft = 8 - this.bitOffset;
      const bitsToRead = Math.min(length - bitsRead, bitsLeft);
      if (this.endianness === "little-endian") {
        const mask = (1 << bitsToRead) - 1;
        const bits = currentByte >> this.bitOffset & mask;
        result |= bits << bitsRead;
      } else {
        const mask = (1 << bitsToRead) - 1 << 8 - this.bitOffset - bitsToRead;
        const bits = (currentByte & mask) >> 8 - this.bitOffset - bitsToRead;
        result = result << bitsToRead | bits;
      }
      bitsRead += bitsToRead;
      this.bitOffset += bitsToRead;
      if (this.bitOffset === 8) {
        this.byteOffset++;
        this.bitOffset = 0;
      }
    }
    return result;
  }
};

// lib/types/jxl-stream.ts
function calculateImageDimension(reader, isSmallImage) {
  if (isSmallImage) {
    return 8 * (1 + reader.getBits(5));
  }
  const sizeClass = reader.getBits(2);
  const extraBits = [9, 13, 18, 30][sizeClass];
  return 1 + reader.getBits(extraBits);
}
function calculateImageWidth(reader, isSmallImage, widthMode, height) {
  if (isSmallImage && widthMode === 0) {
    return 8 * (1 + reader.getBits(5));
  }
  if (widthMode === 0) {
    return calculateImageDimension(reader, false);
  }
  const aspectRatios = [1, 1.2, 4 / 3, 1.5, 16 / 9, 5 / 4, 2];
  return Math.floor(height * aspectRatios[widthMode - 1]);
}
var JXLStream = {
  validate: (input) => {
    return toHexString(input, 0, 2) === "ff0a";
  },
  calculate(input) {
    const reader = new BitReader(input, "little-endian");
    const isSmallImage = reader.getBits(1) === 1;
    const height = calculateImageDimension(reader, isSmallImage);
    const widthMode = reader.getBits(3);
    const width = calculateImageWidth(reader, isSmallImage, widthMode, height);
    return { width, height };
  }
};

// lib/types/jxl.ts
function extractCodestream(input) {
  const jxlcBox = findBox(input, "jxlc", 0);
  if (jxlcBox) {
    return input.slice(jxlcBox.offset + 8, jxlcBox.offset + jxlcBox.size);
  }
  const partialStreams = extractPartialStreams(input);
  if (partialStreams.length > 0) {
    return concatenateCodestreams(partialStreams);
  }
  return void 0;
}
function extractPartialStreams(input) {
  const partialStreams = [];
  let offset = 0;
  while (offset < input.length) {
    const jxlpBox = findBox(input, "jxlp", offset);
    if (!jxlpBox) break;
    partialStreams.push(
      input.slice(jxlpBox.offset + 12, jxlpBox.offset + jxlpBox.size)
    );
    offset = jxlpBox.offset + jxlpBox.size;
  }
  return partialStreams;
}
function concatenateCodestreams(partialCodestreams) {
  const totalLength = partialCodestreams.reduce(
    (acc, curr) => acc + curr.length,
    0
  );
  const codestream = new Uint8Array(totalLength);
  let position = 0;
  for (const partial of partialCodestreams) {
    codestream.set(partial, position);
    position += partial.length;
  }
  return codestream;
}
var JXL = {
  validate: (input) => {
    const boxType = toUTF8String(input, 4, 8);
    if (boxType !== "JXL ") return false;
    const ftypBox = findBox(input, "ftyp", 0);
    if (!ftypBox) return false;
    const brand = toUTF8String(input, ftypBox.offset + 8, ftypBox.offset + 12);
    return brand === "jxl ";
  },
  calculate(input) {
    const codestream = extractCodestream(input);
    if (codestream) return JXLStream.calculate(codestream);
    throw new Error("No codestream found in JXL container");
  }
};

// lib/types/ktx.ts
var KTX = {
  validate: (input) => {
    const signature = toUTF8String(input, 1, 7);
    return ["KTX 11", "KTX 20"].includes(signature);
  },
  calculate: (input) => {
    const type = input[5] === 49 ? "ktx" : "ktx2";
    const offset = type === "ktx" ? 36 : 20;
    return {
      height: readUInt32LE(input, offset + 4),
      width: readUInt32LE(input, offset),
      type
    };
  }
};

// lib/types/png.ts
var pngSignature = "PNG\r\n\n";
var pngImageHeaderChunkName = "IHDR";
var pngFriedChunkName = "CgBI";
var PNG = {
  validate(input) {
    if (pngSignature === toUTF8String(input, 1, 8)) {
      let chunkName = toUTF8String(input, 12, 16);
      if (chunkName === pngFriedChunkName) {
        chunkName = toUTF8String(input, 28, 32);
      }
      if (chunkName !== pngImageHeaderChunkName) {
        throw new TypeError("Invalid PNG");
      }
      return true;
    }
    return false;
  },
  calculate(input) {
    if (toUTF8String(input, 12, 16) === pngFriedChunkName) {
      return {
        height: readUInt32BE(input, 36),
        width: readUInt32BE(input, 32)
      };
    }
    return {
      height: readUInt32BE(input, 20),
      width: readUInt32BE(input, 16)
    };
  }
};

// lib/types/pnm.ts
var PNMTypes = {
  P1: "pbm/ascii",
  P2: "pgm/ascii",
  P3: "ppm/ascii",
  P4: "pbm",
  P5: "pgm",
  P6: "ppm",
  P7: "pam",
  PF: "pfm"
};
var handlers = {
  default: (lines) => {
    let dimensions = [];
    while (lines.length > 0) {
      const line = lines.shift();
      if (line[0] === "#") {
        continue;
      }
      dimensions = line.split(" ");
      break;
    }
    if (dimensions.length === 2) {
      return {
        height: Number.parseInt(dimensions[1], 10),
        width: Number.parseInt(dimensions[0], 10)
      };
    }
    throw new TypeError("Invalid PNM");
  },
  pam: (lines) => {
    const size = {};
    while (lines.length > 0) {
      const line = lines.shift();
      if (line.length > 16 || line.charCodeAt(0) > 128) {
        continue;
      }
      const [key, value] = line.split(" ");
      if (key && value) {
        size[key.toLowerCase()] = Number.parseInt(value, 10);
      }
      if (size.height && size.width) {
        break;
      }
    }
    if (size.height && size.width) {
      return {
        height: size.height,
        width: size.width
      };
    }
    throw new TypeError("Invalid PAM");
  }
};
var PNM = {
  validate: (input) => toUTF8String(input, 0, 2) in PNMTypes,
  calculate(input) {
    const signature = toUTF8String(input, 0, 2);
    const type = PNMTypes[signature];
    const lines = toUTF8String(input, 3).split(/[\r\n]+/);
    const handler = handlers[type] || handlers.default;
    return handler(lines);
  }
};

// lib/types/psd.ts
var PSD = {
  validate: (input) => toUTF8String(input, 0, 4) === "8BPS",
  calculate: (input) => ({
    height: readUInt32BE(input, 14),
    width: readUInt32BE(input, 18)
  })
};

// lib/types/svg.ts
var svgReg = /<svg\s([^>"']|"[^"]*"|'[^']*')*>/;
var extractorRegExps = {
  height: /\sheight=(['"])([^%]+?)\1/,
  root: svgReg,
  viewbox: /\sviewBox=(['"])(.+?)\1/i,
  width: /\swidth=(['"])([^%]+?)\1/
};
var INCH_CM = 2.54;
var units = {
  in: 96,
  cm: 96 / INCH_CM,
  em: 16,
  ex: 8,
  m: 96 / INCH_CM * 100,
  mm: 96 / INCH_CM / 10,
  pc: 96 / 72 / 12,
  pt: 96 / 72,
  px: 1
};
var unitsReg = new RegExp(
  `^([0-9.]+(?:e\\d+)?)(${Object.keys(units).join("|")})?$`
);
function parseLength(len) {
  const m = unitsReg.exec(len);
  if (!m) {
    return void 0;
  }
  return Math.round(Number(m[1]) * (units[m[2]] || 1));
}
function parseViewbox(viewbox) {
  const bounds = viewbox.split(" ");
  return {
    height: parseLength(bounds[3]),
    width: parseLength(bounds[2])
  };
}
function parseAttributes(root) {
  const width = root.match(extractorRegExps.width);
  const height = root.match(extractorRegExps.height);
  const viewbox = root.match(extractorRegExps.viewbox);
  return {
    height: height && parseLength(height[2]),
    viewbox: viewbox && parseViewbox(viewbox[2]),
    width: width && parseLength(width[2])
  };
}
function calculateByDimensions(attrs) {
  return {
    height: attrs.height,
    width: attrs.width
  };
}
function calculateByViewbox(attrs, viewbox) {
  const ratio = viewbox.width / viewbox.height;
  if (attrs.width) {
    return {
      height: Math.floor(attrs.width / ratio),
      width: attrs.width
    };
  }
  if (attrs.height) {
    return {
      height: attrs.height,
      width: Math.floor(attrs.height * ratio)
    };
  }
  return {
    height: viewbox.height,
    width: viewbox.width
  };
}
var SVG = {
  // Scan only the first kilo-byte to speed up the check on larger files
  validate: (input) => svgReg.test(toUTF8String(input, 0, 1e3)),
  calculate(input) {
    const root = toUTF8String(input).match(extractorRegExps.root);
    if (root) {
      const attrs = parseAttributes(root[0]);
      if (attrs.width && attrs.height) {
        return calculateByDimensions(attrs);
      }
      if (attrs.viewbox) {
        return calculateByViewbox(attrs, attrs.viewbox);
      }
    }
    throw new TypeError("Invalid SVG");
  }
};

// lib/types/tga.ts
var TGA = {
  validate(input) {
    return readUInt16LE(input, 0) === 0 && readUInt16LE(input, 4) === 0;
  },
  calculate(input) {
    return {
      height: readUInt16LE(input, 14),
      width: readUInt16LE(input, 12)
    };
  }
};

// lib/types/tiff.ts
var CONSTANTS = {
  TAG: {
    WIDTH: 256,
    HEIGHT: 257,
    COMPRESSION: 259
  },
  TYPE: {
    SHORT: 3,
    LONG: 4,
    LONG8: 16
  },
  ENTRY_SIZE: {
    STANDARD: 12,
    BIG: 20
  },
  COUNT_SIZE: {
    STANDARD: 2,
    BIG: 8
  }
};
function readIFD(input, { isBigEndian, isBigTiff }) {
  const ifdOffset = isBigTiff ? Number(readUInt64(input, 8, isBigEndian)) : readUInt(input, 32, 4, isBigEndian);
  const entryCountSize = isBigTiff ? CONSTANTS.COUNT_SIZE.BIG : CONSTANTS.COUNT_SIZE.STANDARD;
  return input.slice(ifdOffset + entryCountSize);
}
function readTagValue(input, type, offset, isBigEndian) {
  switch (type) {
    case CONSTANTS.TYPE.SHORT:
      return readUInt(input, 16, offset, isBigEndian);
    case CONSTANTS.TYPE.LONG:
      return readUInt(input, 32, offset, isBigEndian);
    case CONSTANTS.TYPE.LONG8: {
      const value = Number(readUInt64(input, offset, isBigEndian));
      if (value > Number.MAX_SAFE_INTEGER) {
        throw new TypeError("Value too large");
      }
      return value;
    }
    default:
      return 0;
  }
}
function nextTag(input, isBigTiff) {
  const entrySize = isBigTiff ? CONSTANTS.ENTRY_SIZE.BIG : CONSTANTS.ENTRY_SIZE.STANDARD;
  if (input.length > entrySize) {
    return input.slice(entrySize);
  }
}
function extractTags(input, { isBigEndian, isBigTiff }) {
  const tags = {};
  let temp = input;
  while (temp?.length) {
    const code = readUInt(temp, 16, 0, isBigEndian);
    const type = readUInt(temp, 16, 2, isBigEndian);
    const length = isBigTiff ? Number(readUInt64(temp, 4, isBigEndian)) : readUInt(temp, 32, 4, isBigEndian);
    if (code === 0) break;
    if (length === 1 && (type === CONSTANTS.TYPE.SHORT || type === CONSTANTS.TYPE.LONG || isBigTiff && type === CONSTANTS.TYPE.LONG8)) {
      const valueOffset = isBigTiff ? 12 : 8;
      tags[code] = readTagValue(temp, type, valueOffset, isBigEndian);
    }
    temp = nextTag(temp, isBigTiff);
  }
  return tags;
}
function determineFormat(input) {
  const signature = toUTF8String(input, 0, 2);
  const version = readUInt(input, 16, 2, signature === "MM");
  return {
    isBigEndian: signature === "MM",
    isBigTiff: version === 43
  };
}
function validateBigTIFFHeader(input, isBigEndian) {
  const byteSize = readUInt(input, 16, 4, isBigEndian);
  const reserved = readUInt(input, 16, 6, isBigEndian);
  if (byteSize !== 8 || reserved !== 0) {
    throw new TypeError("Invalid BigTIFF header");
  }
}
var signatures = /* @__PURE__ */ new Set([
  "49492a00",
  // Little Endian
  "4d4d002a",
  // Big Endian
  "49492b00",
  // BigTIFF Little Endian
  "4d4d002b"
  // BigTIFF Big Endian
]);
var TIFF = {
  validate: (input) => {
    const signature = toHexString(input, 0, 4);
    return signatures.has(signature);
  },
  calculate(input) {
    const format = determineFormat(input);
    if (format.isBigTiff) {
      validateBigTIFFHeader(input, format.isBigEndian);
    }
    const ifdBuffer = readIFD(input, format);
    const tags = extractTags(ifdBuffer, format);
    const info = {
      height: tags[CONSTANTS.TAG.HEIGHT],
      width: tags[CONSTANTS.TAG.WIDTH],
      type: format.isBigTiff ? "bigtiff" : "tiff"
    };
    if (tags[CONSTANTS.TAG.COMPRESSION]) {
      info.compression = tags[CONSTANTS.TAG.COMPRESSION];
    }
    if (!info.width || !info.height) {
      throw new TypeError("Invalid Tiff. Missing tags");
    }
    return info;
  }
};

// lib/types/webp.ts
function calculateExtended(input) {
  return {
    height: 1 + readUInt24LE(input, 7),
    width: 1 + readUInt24LE(input, 4)
  };
}
function calculateLossless(input) {
  return {
    height: 1 + ((input[4] & 15) << 10 | input[3] << 2 | (input[2] & 192) >> 6),
    width: 1 + ((input[2] & 63) << 8 | input[1])
  };
}
function calculateLossy(input) {
  return {
    height: readInt16LE(input, 8) & 16383,
    width: readInt16LE(input, 6) & 16383
  };
}
var WEBP = {
  validate(input) {
    const riffHeader = "RIFF" === toUTF8String(input, 0, 4);
    const webpHeader = "WEBP" === toUTF8String(input, 8, 12);
    const vp8Header = "VP8" === toUTF8String(input, 12, 15);
    return riffHeader && webpHeader && vp8Header;
  },
  calculate(_input) {
    const chunkHeader = toUTF8String(_input, 12, 16);
    const input = _input.slice(20, 30);
    if (chunkHeader === "VP8X") {
      const extendedHeader = input[0];
      const validStart = (extendedHeader & 192) === 0;
      const validEnd = (extendedHeader & 1) === 0;
      if (validStart && validEnd) {
        return calculateExtended(input);
      }
      throw new TypeError("Invalid WebP");
    }
    if (chunkHeader === "VP8 " && input[0] !== 47) {
      return calculateLossy(input);
    }
    const signature = toHexString(input, 3, 6);
    if (chunkHeader === "VP8L" && signature !== "9d012a") {
      return calculateLossless(input);
    }
    throw new TypeError("Invalid WebP");
  }
};

// lib/types/index.ts
var typeHandlers = /* @__PURE__ */ new Map([
  ["bmp", BMP],
  ["cur", CUR],
  ["dds", DDS],
  ["gif", GIF],
  ["heif", HEIF],
  ["icns", ICNS],
  ["ico", ICO],
  ["j2c", J2C],
  ["jp2", JP2],
  ["jpg", JPG],
  ["jxl", JXL],
  ["jxl-stream", JXLStream],
  ["ktx", KTX],
  ["png", PNG],
  ["pnm", PNM],
  ["psd", PSD],
  ["svg", SVG],
  ["tga", TGA],
  ["tiff", TIFF],
  ["webp", WEBP]
]);
var types = Array.from(typeHandlers.keys());

// lib/detector.ts
var firstBytes = /* @__PURE__ */ new Map([
  [0, "heif"],
  [56, "psd"],
  [66, "bmp"],
  [68, "dds"],
  [71, "gif"],
  [73, "tiff"],
  [77, "tiff"],
  [82, "webp"],
  [105, "icns"],
  [137, "png"],
  [255, "jpg"]
]);
function detector(input) {
  const byte = input[0];
  const type = firstBytes.get(byte);
  if (type && typeHandlers.get(type).validate(input)) {
    return type;
  }
  return types.find((type2) => typeHandlers.get(type2).validate(input));
}

export { detector };