20382848403

Committed 19 Dec 2025 09:20PM UTC coverage: 35.219% (+0.1%) from 35.095%

Build # 20382848403

Build Type

push

github

Committed by

web-flow

Commit Message

feat: Upgrade to handle ArrayBufferLike (#3271)

Run Details

1190 of 2002 branches covered (59.44%)

Branch coverage included in aggregate %.

157 of 269 new or added lines in 41 files covered. (58.36%)

3 existing lines in 3 files now uncovered.

37536 of 107957 relevant lines covered (34.77%)

0.79 hits per line

Source File
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46.81

/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	1✔
2	// SPDX-License-Identifier: MIT	1✔
3	// Copyright (c) vis.gl contributors	1✔
4		1✔
5	/**	1✔
6	* Get the first characters from a binary file (interpret the first bytes as an ASCII string)	1✔
7	* @param data	1✔
8	* @param length	1✔
9	* @returns	1✔
10	*/	1✔
11	export function getFirstCharacters(data: string \| ArrayBuffer, length: number = 5): string {	1✔
12	if (typeof data === 'string') {	×
13	return data.slice(0, length);	×
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		1✔
24	/**	1✔
25	* Gets a magic string from a "file"	1✔
26	* Typically used to check or detect file format	1✔
27	* @param arrayBuffer	1✔
28	* @param byteOffset	1✔
29	* @param length	1✔
30	* @returns	1✔
31	*/	1✔
32	export function getMagicString(	1✔
NEW 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 / 20382848403

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