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https://github.com/mauriceboe/TREK.git
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Maurice
8b93898b73
The Studio draws the page on request and uploads it once, each provider gets the image where it expects it, and a refusal falls back to the text description. No image is stored.
58 lines
2.2 KiB
TypeScript
58 lines
2.2 KiB
TypeScript
import { readImageHeader } from '../../../../src/nest/common/image-header';
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import { describe, expect, it } from 'vitest';
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/** SOI, then the given segments, then a baseline frame header of w x h. */
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function jpeg(w: number, h: number, ...before: number[][]): Buffer {
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const sof = Buffer.alloc(19);
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sof.writeUInt16BE(0xffc0, 0);
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sof.writeUInt16BE(17, 2);
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sof.writeUInt8(8, 4);
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sof.writeUInt16BE(h, 5);
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sof.writeUInt16BE(w, 7);
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return Buffer.concat([Buffer.from([0xff, 0xd8]), ...before.map((bytes) => Buffer.from(bytes)), sof]);
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}
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function webp(chunk: string, length: number): Buffer {
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const out = Buffer.alloc(length);
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out.write('RIFF', 0, 'latin1');
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out.write('WEBP', 8, 'latin1');
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out.write(chunk, 12, 'latin1');
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return out;
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}
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describe('readImageHeader', () => {
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it('IMGHDR-001: steps over stray bytes, fill bytes and the markers that carry no length', () => {
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const segments = [
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[0x00, 0x12],
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[0xff, 0xff],
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[0xff, 0x01],
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[0xff, 0xd0],
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[0xff, 0xe1, 0x00, 0x04, 0, 0],
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];
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expect(readImageHeader(jpeg(800, 600, ...segments))).toEqual({ mimeType: 'image/jpeg', width: 800, height: 600 });
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});
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it('IMGHDR-002: a JPEG whose segment length is broken, or whose frame header is cut, says no size', () => {
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expect(readImageHeader(Buffer.from([0xff, 0xd8, 0xff, 0xe0, 0x00, 0x01, 0, 0]))).toBeNull();
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expect(readImageHeader(Buffer.from([0xff, 0xd8, 0xff, 0xc0, 0x00, 0x11, 8, 0]))).toBeNull();
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expect(readImageHeader(Buffer.from([0xff, 0xd8, 0xff, 0xda, 0x00, 0x08]))).toBeNull();
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expect(readImageHeader(jpeg(0, 600))).toBeNull();
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});
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it('IMGHDR-003: a WebP too short for its chunk, or with a chunk it does not know, says no size', () => {
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expect(readImageHeader(webp('VP8 ', 20))).toBeNull();
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expect(readImageHeader(webp('VP8L', 22))).toBeNull();
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expect(readImageHeader(webp('VP8X', 26))).toBeNull();
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expect(readImageHeader(webp('ALPH', 30))).toBeNull();
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});
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it('IMGHDR-004: a PNG signature without its IHDR chunk is no PNG', () => {
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const data = Buffer.alloc(24);
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data.writeUInt32BE(0x89504e47, 0);
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data.write('IDAT', 12, 'latin1');
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expect(readImageHeader(data)).toBeNull();
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expect(readImageHeader(Buffer.from([0xff, 0xd8]))).toBeNull();
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});
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});
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