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37 lines
828 B
TypeScript
37 lines
828 B
TypeScript
// Loaded from https://deno.land/x/deno_image@v0.0.3/mime-type.ts
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/**
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* Return mime type of a file
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* @param headerString - header of file
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* List here:
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* https://en.wikipedia.org/wiki/List_of_file_signatures
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* https://mimesniff.spec.whatwg.org/#matching-an-image-type-pattern
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*/
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export function mimeType(imgFile: Uint8Array) {
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// Get mime type
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const arr = imgFile.subarray(0, 4);
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let header = "";
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for (let i = 0; i < arr.length; i++) {
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header += arr[i].toString(16);
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}
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let type = "unknown";
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switch (header) {
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case "89504e47":
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type = "image/png";
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break;
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case "47494638":
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type = "image/gif";
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break;
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case "ffd8ffe0":
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case "ffd8ffe1":
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case "ffd8ffe2":
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type = "image/jpeg";
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break;
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default:
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type = "unknown";
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break;
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}
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return type;
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} |