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* Copyright 2026 nodearchive
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import path from 'node:path'
import { gunzipSync } from 'node:zlib'
import type { ArchiveManifest } from '../../.types/ArchiveManifest/type.js'
import { toNodearchiveError } from '../../.helpers/toNodearchiveError/index.js'
import { readTarArchive } from '../readTarArchive/index.js'
import { toArchiveManifest } from '../toArchiveManifest/index.js'
export async function readGzipArchive(
bytes: Uint8Array,
sourcePath?: string
): Promise<ArchiveManifest> {
try {
const inflated = Uint8Array.from(gunzipSync(bytes))
if (looksLikeTar(inflated)) {
return readTarArchive(inflated)
}
return toArchiveManifest([
{
data: Buffer.from(inflated).toString('base64'),
kind: 'file',
path: toEntryPath(sourcePath),
},
])
} catch (error) {
throw toNodearchiveError(
error,
'ARCHIVE_INVALID_FORMAT',
'Invalid gzip archive'
)
}
}
function looksLikeTar(bytes: Uint8Array): boolean {
return (
bytes.length >= 262 &&
Buffer.from(bytes.subarray(257, 262)).toString('utf8') === 'ustar'
)
}
function toEntryPath(sourcePath?: string): string {
if (!sourcePath) {
return 'archive'
}
const basename = path.basename(sourcePath)
const uncompressed = basename.replace(/\.gz$/iu, '')
return uncompressed || 'archive'
}
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