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'use strict';
// Test unzipping a gzip file that has trailing garbage
const common = require('../common');
const assert = require('assert');
const zlib = require('zlib');
// Should ignore trailing null-bytes
let data = Buffer.concat([
zlib.gzipSync('abc'),
zlib.gzipSync('def'),
Buffer.alloc(10)
]);
assert.strictEqual(zlib.gunzipSync(data).toString(), 'abcdef');
zlib.gunzip(data, common.mustCall((err, result) => {
assert.ifError(err);
assert.strictEqual(
result.toString(),
'abcdef',
`result '${result.toString()}' should match original string`
);
}));
// If the trailing garbage happens to look like a gzip header, it should
// throw an error.
data = Buffer.concat([
zlib.gzipSync('abc'),
zlib.gzipSync('def'),
Buffer.from([0x1f, 0x8b, 0xff, 0xff]),
Buffer.alloc(10)
]);
assert.throws(
() => zlib.gunzipSync(data),
/^Error: unknown compression method$/
);
zlib.gunzip(data, common.mustCall((err, result) => {
common.expectsError({
code: 'Z_DATA_ERROR',
type: Error,
message: 'unknown compression method'
})(err);
assert.strictEqual(result, undefined);
}));
// In this case the trailing junk is too short to be a gzip segment
// So we ignore it and decompression succeeds.
data = Buffer.concat([
zlib.gzipSync('abc'),
zlib.gzipSync('def'),
Buffer.from([0x1f, 0x8b, 0xff, 0xff])
]);
assert.throws(
() => zlib.gunzipSync(data),
/^Error: unknown compression method$/
);
zlib.gunzip(data, common.mustCall((err, result) => {
assert(err instanceof Error);
assert.strictEqual(err.code, 'Z_DATA_ERROR');
assert.strictEqual(err.message, 'unknown compression method');
assert.strictEqual(result, undefined);
}));
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