Brunobkr/llama.cpp_AlgMor24_github

1const toDataView = require('to-data-view')2const decodeBmp = require('decode-bmp')3const ImageData = require('@canvas/image-data')4 5function isPng (view, offset) {6  return (view.getUint32(offset + 0) === 0x89504e47 && view.getUint32(offset + 4) === 0x0d0a1a0a)7}8 9function pngBitsPerPixel (view, offset) {10  const bitDepth = view.getUint8(offset + 24)11  const colorType = view.getUint8(offset + 25)12 13  if (colorType === 0) return bitDepth * 114  if (colorType === 2) return bitDepth * 315  if (colorType === 3) return bitDepth * 116  if (colorType === 4) return bitDepth * 217  if (colorType === 6) return bitDepth * 418 19  throw new Error('Invalid PNG colorType')20}21 22function pngWidth (view, offset) {23  return view.getUint32(offset + 16, false)24}25 26function pngHeight (view, offset) {27  return view.getUint32(offset + 20, false)28}29 30module.exports = function decodeIco (input) {31  const view = toDataView(input)32 33  if (view.byteLength < 6) {34    throw new Error('Truncated header')35  }36 37  if (isPng(view, 0)) {38    // the file is actually a png masquerading as an ico39 40    return [{41      bpp: pngBitsPerPixel(view, 0),42      data: new Uint8Array(view.buffer, view.byteOffset, view.byteLength),43      height: pngHeight(view, 0),44      hotspot: null,45      type: 'png',46      width: pngWidth(view, 0)47    }]48  }49 50  if (view.getUint16(0, true) !== 0) {51    throw new Error('Invalid magic bytes')52  }53 54  const type = view.getUint16(2, true)55 56  if (type !== 1 && type !== 2) {57    throw new Error('Invalid image type')58  }59 60  const length = view.getUint16(4, true)61 62  if (view.byteLength < 6 + (16 * length)) {63    throw new Error('Truncated image list')64  }65 66  return Array.from({ length }, (_, idx) => {67    const width = view.getUint8(6 + (16 * idx) + 0)68    const height = view.getUint8(6 + (16 * idx) + 1)69    const size = view.getUint32(6 + (16 * idx) + 8, true)70    const offset = view.getUint32(6 + (16 * idx) + 12, true)71 72    const hotspot = (type !== 2 ? null : {73      x: view.getUint16(6 + (16 * idx) + 4, true),74      y: view.getUint16(6 + (16 * idx) + 6, true)75    })76 77    if (isPng(view, offset)) {78      return {79        bpp: pngBitsPerPixel(view, offset),80        data: new Uint8Array(view.buffer, view.byteOffset + offset, size),81        height: pngHeight(view, offset),82        hotspot,83        type: 'png',84        width: pngWidth(view, offset)85      }86    }87 88    const data = new Uint8Array(view.buffer, view.byteOffset + offset, size)89    const bmp = decodeBmp(data, { width, height, icon: true })90    const info = { bpp: bmp.colorDepth, hotspot, type: 'bmp' }91 92    return Object.assign(new ImageData(bmp.data, bmp.width, bmp.height), info)93  })94}95