file_bytes_reader.js ➔ readChunk - Code Metrics - Inspection of "code distribution to files" - Dead4W/jsAesCrypt - Measure and Improve Code Quality continuously with Scrutinizer

Passed

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by Ilya

created 2021-01-06 20:58 UTC

file_bytes_reader.js ➔ readChunk A

↳ Parent: src/file_bytes_reader.js

Complexity

Conditions

Size

Total Lines	14
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
eloc	7
dl	0
loc	14
rs	10
c	0
b	0
f	0
cc	4

/**
 * read file as string, bytes (uint8Array), int (1 byte)
 *
 *
 * @return The fileBytesReader object.
 *
 * @static
 *
 * @example
 *     var fileElement = document.getElementById('file').files[0];
 *     var file = fileBytesReader(fileElement);
 *
 * @param file a fileElement object
 */


const fileBytesReader = function(file) {

    let _i = 0;
    let _fileSize = file.size;
    let _reader = new FileReader();

    let _file = file;

    function readChunk(length) {
        return new Promise((resolve, reject) => {
            let blob = _file.slice(_i, _i += length);

            _reader.onload = () => {
                // return Uint8Array
                resolve(new Uint8Array(_reader.result));
            };

            _reader.onerror = reject;

            _reader.readAsArrayBuffer(blob);
        });
    }

    async function readBytes(length) {
        return await readChunk(length);
    }

    async function readByte() {
        let bytes = await readBytes(1);
        return bytes[0];
    }

    function getCurrentPosition() {
        return _i;
    }

    function getLength() {
        return _fileSize;
    }

    return {
        readByte: readByte,
        readBytes: readBytes,
        getCurrentPosition: getCurrentPosition,
        getLength: getLength,
    };
};


1			/**
2			* read file as string, bytes (uint8Array), int (1 byte)
3			*
4			*
5			* @return The fileBytesReader object.
6			*
7			* @static
8			*
9			* @example
10			* var fileElement = document.getElementById('file').files[0];
11			* var file = fileBytesReader(fileElement);
12			*
13			* @param file a fileElement object
14			*/
15
16
17			const fileBytesReader = function(file) {
			1 ignored issue – show Unused Code introduced 2021-01-06 20:59 UTC by Report Bug Copy Issue Report The constant `fileBytesReader` seems to be never used. Consider removing it. Loading history...
18			let _i = 0;
19			let _fileSize = file.size;
20			let _reader = new FileReader();
			0 ignored issues – show Bug introduced 2021-01-06 20:59 UTC by Report Bug Copy Issue Report The variable `FileReader` seems to be never declared. If this is a global, consider adding a `/** global: FileReader */` comment. This checks looks for references to variables that have not been declared. This is most likey a typographical error or a variable has been renamed. To learn more about declaring variables in Javascript, see the MDN. Loading history...
21			let _file = file;
22
23			function readChunk(length) {
24			return new Promise((resolve, reject) => {
25			let blob = _file.slice(_i, _i += length);
26
27			_reader.onload = () => {
28			// return Uint8Array
29			resolve(new Uint8Array(_reader.result));
30			};
31
32			_reader.onerror = reject;
33
34			_reader.readAsArrayBuffer(blob);
35			});
36			}
37
38			async function readBytes(length) {
39			return await readChunk(length);
40			}
41
42			async function readByte() {
43			let bytes = await readBytes(1);
44			return bytes[0];
45			}
46
47			function getCurrentPosition() {
48			return _i;
49			}
50
51			function getLength() {
52			return _fileSize;
53			}
54
55			return {
56			readByte: readByte,
57			readBytes: readBytes,
58			getCurrentPosition: getCurrentPosition,
59			getLength: getLength,
60			};
61			};
62

Dead4W / jsAesCrypt

Push — async ( 76f42a...eb4889 )

file_bytes_reader.js ➔ readChunk A

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