24153816851

Committed 08 Apr 2026 07:17PM UTC coverage: 53.247% (-12.1%) from 65.319%

Build # 24153816851

Build Type

push

github

Committed by

web-flow

Commit Message

chore: Move from tape to vitest (#3351)

Coverage Stats

8651 of 17291 branches covered (50.03%)

Branch coverage included in aggregate %.

7 of 7 new or added lines in 1 file covered. (100.0%)

2031 existing lines in 296 files now uncovered.

17563 of 31940 relevant lines covered (54.99%)

5279.54 hits per line

Source File
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16.67

/modules/loader-utils/src/lib/binary-utils/get-first-characters.ts

// loaders.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors

/**
 * Get the first characters from a binary file (interpret the first bytes as an ASCII string)
 * @param data
 * @param length
 * @returns
 */
export function getFirstCharacters(data: string | ArrayBuffer, length: number = 5): string {
  if (typeof data === 'string') {
    return data.slice(0, length);
  } else if (ArrayBuffer.isView(data)) {
    // Typed Arrays can have offsets into underlying buffer
    return getMagicString(data.buffer, data.byteOffset, length);
  } else if (data instanceof ArrayBuffer) {
    const byteOffset = 0;
    return getMagicString(data, byteOffset, length);
  }
  return '';
}

/**
 * Gets a magic string from a "file"
 * Typically used to check or detect file format
 * @param arrayBuffer
 * @param byteOffset
 * @param length
 * @returns
 */
export function getMagicString(
  arrayBuffer: ArrayBufferLike,
  byteOffset: number,
  length: number
): string {
  if (arrayBuffer.byteLength <= byteOffset + length) {
    return '';
  }
  const dataView = new DataView(arrayBuffer);
  let magic = '';
  for (let i = 0; i < length; i++) {
    magic += String.fromCharCode(dataView.getUint8(byteOffset + i));
  }
  return magic;
}

1	// loaders.gl
2	// SPDX-License-Identifier: MIT
3	// Copyright (c) vis.gl contributors
4
5	/**
6	* Get the first characters from a binary file (interpret the first bytes as an ASCII string)
7	* @param data
8	* @param length
9	* @returns
10	*/
11	export function getFirstCharacters(data: string \| ArrayBuffer, length: number = 5): string {	2✔
12	if (typeof data === 'string') {	2!
13	return data.slice(0, length);	2✔
UNCOV 14	} else if (ArrayBuffer.isView(data)) {	×
15	// Typed Arrays can have offsets into underlying buffer
16	return getMagicString(data.buffer, data.byteOffset, length);	×
17	} else if (data instanceof ArrayBuffer) {	×
18	const byteOffset = 0;	×
19	return getMagicString(data, byteOffset, length);	×
20	}
21	return '';	×
22	}
23
24	/**
25	* Gets a magic string from a "file"
26	* Typically used to check or detect file format
27	* @param arrayBuffer
28	* @param byteOffset
29	* @param length
30	* @returns
31	*/
32	export function getMagicString(
33	arrayBuffer: ArrayBufferLike,
34	byteOffset: number,
35	length: number
36	): string {
37	if (arrayBuffer.byteLength <= byteOffset + length) {	×
38	return '';	×
39	}
40	const dataView = new DataView(arrayBuffer);	×
41	let magic = '';	×
42	for (let i = 0; i < length; i++) {	×
43	magic += String.fromCharCode(dataView.getUint8(byteOffset + i));	×
44	}
45	return magic;	×
46	}

visgl / loaders.gl / 24153816851

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