util-picture.ts ➔ getPictureMimeTypeFromBuffer - Code Metrics - Inspection of "Merge pull request #158 from pbricout/use-types-fo..." - Zazama/node-id3 - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 57140e...ff6124 )

by Jan

created 2023-03-28 22:58 UTC

util-picture.ts ➔ getPictureMimeTypeFromBuffer A

↳ Parent: src/frames/util-picture.ts

Complexity

Conditions

Size

Total Lines	15
Code Lines	13

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
eloc	13
dl	0
loc	15
rs	9.75
c	0
b	0
f	0
cc	3

import * as fs from "fs"
import { isBuffer } from "../util"

function getPictureMimeTypeFromBuffer(pictureBuffer: Buffer) {
    if (
        pictureBuffer.length > 3 &&
        pictureBuffer.compare(Buffer.from([0xff, 0xd8, 0xff]), 0, 3, 0, 3) === 0
    ) {
        return "image/jpeg"
    }
    if (
        pictureBuffer.length > 8 &&
        pictureBuffer.compare(Buffer.from([0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A]), 0, 8, 0, 8) === 0
    ) {
        return "image/png"
    }
    return ""
}

export function retrievePictureAndMimeType({
    filenameOrBuffer,
    mimeType
}: {
    filenameOrBuffer?: Buffer | string
    mimeType?: string
}) {
    if (!filenameOrBuffer) {
        throw new TypeError("Missing image buffer or filename")
    }
    const pictureBuffer = isBuffer(filenameOrBuffer) ?
        filenameOrBuffer : fs.readFileSync(filenameOrBuffer)
    return {
        pictureBuffer,
        mimeType: mimeType ?? getPictureMimeTypeFromBuffer(pictureBuffer)
    }
}


1			import * as fs from "fs"
2			import { isBuffer } from "../util"
3
4			function getPictureMimeTypeFromBuffer(pictureBuffer: Buffer) {
5			if (
6			pictureBuffer.length > 3 &&
7			pictureBuffer.compare(Buffer.from([0xff, 0xd8, 0xff]), 0, 3, 0, 3) === 0
8			) {
9			return "image/jpeg"
10			}
11			if (
12			pictureBuffer.length > 8 &&
13			pictureBuffer.compare(Buffer.from([0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A]), 0, 8, 0, 8) === 0
14			) {
15			return "image/png"
16			}
17			return ""
18			}
19
20			export function retrievePictureAndMimeType({
21			filenameOrBuffer,
22			mimeType
23			}: {
24			filenameOrBuffer?: Buffer \| string
25			mimeType?: string
26			}) {
27			if (!filenameOrBuffer) {
28			throw new TypeError("Missing image buffer or filename")
29			}
30			const pictureBuffer = isBuffer(filenameOrBuffer) ?
31			filenameOrBuffer : fs.readFileSync(filenameOrBuffer)
32			return {
33			pictureBuffer,
34			mimeType: mimeType ?? getPictureMimeTypeFromBuffer(pictureBuffer)
35			}
36			}
37

Zazama / node-id3

Push — master ( 57140e...ff6124 )

util-picture.ts ➔ getPictureMimeTypeFromBuffer A

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