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'use strict';
// Test unzipping a gzip file that contains multiple concatenated "members"
const common = require('../common');
const assert = require('assert');
const zlib = require('zlib');
const fs = require('fs');
const fixtures = require('../common/fixtures');
const abc = 'abc';
const def = 'def';
const abcEncoded = zlib.gzipSync(abc);
const defEncoded = zlib.gzipSync(def);
const data = Buffer.concat([
abcEncoded,
defEncoded
]);
assert.strictEqual(zlib.gunzipSync(data).toString(), (abc + def));
zlib.gunzip(data, common.mustCall((err, result) => {
assert.ifError(err);
assert.strictEqual(result.toString(), (abc + def));
}));
zlib.unzip(data, common.mustCall((err, result) => {
assert.ifError(err);
assert.strictEqual(result.toString(), (abc + def));
}));
// Multi-member support does not apply to zlib inflate/deflate.
zlib.unzip(Buffer.concat([
zlib.deflateSync('abc'),
zlib.deflateSync('def')
]), common.mustCall((err, result) => {
assert.ifError(err);
assert.strictEqual(result.toString(), abc);
}));
// Files that have the "right" magic bytes for starting a new gzip member
// in the middle of themselves, even if they are part of a single
// regularly compressed member
const pmmFileZlib = fixtures.path('pseudo-multimember-gzip.z');
const pmmFileGz = fixtures.path('pseudo-multimember-gzip.gz');
const pmmExpected = zlib.inflateSync(fs.readFileSync(pmmFileZlib));
const pmmResultBuffers = [];
fs.createReadStream(pmmFileGz)
.pipe(zlib.createGunzip())
.on('error', (err) => {
assert.ifError(err);
})
.on('data', (data) => pmmResultBuffers.push(data))
.on('finish', common.mustCall(() => {
// Result should match original random garbage
assert.deepStrictEqual(Buffer.concat(pmmResultBuffers), pmmExpected);
}));
// Test that the next gzip member can wrap around the input buffer boundary
[0, 1, 2, 3, 4, defEncoded.length].forEach((offset) => {
const resultBuffers = [];
const unzip = zlib.createGunzip()
.on('error', (err) => {
assert.ifError(err);
})
.on('data', (data) => resultBuffers.push(data))
.on('finish', common.mustCall(() => {
assert.strictEqual(
Buffer.concat(resultBuffers).toString(),
'abcdef',
`result should match original input (offset = ${offset})`
);
}));
// First write: write "abc" + the first bytes of "def"
unzip.write(Buffer.concat([
abcEncoded, defEncoded.slice(0, offset)
]));
// Write remaining bytes of "def"
unzip.end(defEncoded.slice(offset));
});
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