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[fix] apng support

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kwaroran
2024-01-03 19:42:26 +09:00
parent 23ef56cb33
commit b10c973efb
2 changed files with 6 additions and 3 deletions
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4
src/ts/parser.ts
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@@ -305,7 +305,7 @@ async function resizeAndConvert(imageData: Uint8Array): Promise<Buffer> {
type ImageType = 'JPEG' | 'PNG' | 'GIF' | 'BMP' | 'AVIF' | 'WEBP' | 'Unknown';
function checkImageType(arr:Uint8Array):ImageType {
export function checkImageType(arr:Uint8Array):ImageType {
const isJPEG = arr[0] === 0xFF && arr[1] === 0xD8 && arr[arr.length-2] === 0xFF && arr[arr.length-1] === 0xD9;
const isPNG = arr[0] === 0x89 && arr[1] === 0x50 && arr[2] === 0x4E && arr[3] === 0x47 && arr[4] === 0x0D && arr[5] === 0x0A && arr[6] === 0x1A && arr[7] === 0x0A;
const isGIF = arr[0] === 0x47 && arr[1] === 0x49 && arr[2] === 0x46 && arr[3] === 0x38 && (arr[4] === 0x37 || arr[4] === 0x39) && arr[5] === 0x61;
@@ -322,7 +322,7 @@ function checkImageType(arr:Uint8Array):ImageType {
return "Unknown";
}
function isAPNG(pngData: Uint8Array): boolean {
export function isAPNG(pngData: Uint8Array): boolean {
const pngSignature = [0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A];
const acTL = [0x61, 0x63, 0x54, 0x4C];