47556045

Build Type

push

appveyor

Committed by Ben Russell

Commit Message

fixing-missing-settings

Run Details

3255 of 4223 branches covered (77.08%)

Branch coverage included in aggregate %.

26553 of 28216 relevant lines covered (94.11%)

412.85 hits per line

Source File
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11.11

/src/mpeg4/descriptorTagReader.ts

import { NumberUtils } from "../utils";
import { ByteVector } from "../byteVector";

/**
 * Provides methods to read descriptor tags
 */
export class DescriptorTagReader {
    private _length: number = 0;
    private _offset: number = 0;

    public constructor(private data: ByteVector) { }

    public get length(): number {
        return this._length;
    }

    public get offset(): number {
        return this._offset;
    }

    /**
     * Reads a section length and updates the offset to the end of of the length block.
     * @param data A @see ByteVector object to read from.
     * @param offset A value reference specifying the offset at which to read. This value gets updated to the
     * position following the size data.
     * @returns A value containing the length that was read.
     */
    public readLength(): number {
        let b: number = 0;
        const end: number = this._offset + 4;

        do {
            b = this.data.get(this._offset++);
            this._length = NumberUtils.uintOr(NumberUtils.uintLShift(this._length, 7), NumberUtils.uintAnd(b, 0x7f));
        } while (NumberUtils.uintAnd(b, 0x80) !== 0 && this._offset <= end); // The length could be between 1 and 4 bytes for each descriptor

        return this._length;
    }

    /**
     * Increases the current offset by a given value
     * @param value A number by which the offset should be increased
     * @returns A value containing the offset before increase
     */
    public increaseOffset(value: number): number {
        const previousOffset: number = this._offset;
        this._offset += value;

        return previousOffset;
    }
}

1	import { NumberUtils } from "../utils";	1✔
2	import { ByteVector } from "../byteVector";
3
4	/**
5	* Provides methods to read descriptor tags
6	*/
7	export class DescriptorTagReader {	1✔
8	private _length: number = 0;	×
9	private _offset: number = 0;	×
10
11	public constructor(private data: ByteVector) { }	×
12
13	public get length(): number {
14	return this._length;	×
15	}
16
17	public get offset(): number {
18	return this._offset;	×
19	}
20
21	/**
22	* Reads a section length and updates the offset to the end of of the length block.
23	* @param data A @see ByteVector object to read from.
24	* @param offset A value reference specifying the offset at which to read. This value gets updated to the
25	* position following the size data.
26	* @returns A value containing the length that was read.
27	*/
28	public readLength(): number {
29	let b: number = 0;	×
30	const end: number = this._offset + 4;	×
31
32	do {	×
33	b = this.data.get(this._offset++);	×
34	this._length = NumberUtils.uintOr(NumberUtils.uintLShift(this._length, 7), NumberUtils.uintAnd(b, 0x7f));	×
35	} while (NumberUtils.uintAnd(b, 0x80) !== 0 && this._offset <= end); // The length could be between 1 and 4 bytes for each descriptor	×
36
37	return this._length;	×
38	}
39
40	/**
41	* Increases the current offset by a given value
42	* @param value A number by which the offset should be increased
43	* @returns A value containing the offset before increase
44	*/
45	public increaseOffset(value: number): number {
46	const previousOffset: number = this._offset;	×
47	this._offset += value;	×
48
49	return previousOffset;	×
50	}
51	}

benrr101 / node-taglib-sharp / 47556045

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