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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('../');
const path = require('path');
const fs = require('fs');
const abcEncoded = zlib.gzipSync('abc');
const defEncoded = zlib.gzipSync('def');
const data = Buffer.concat([
abcEncoded,
defEncoded
]);
assert.equal(zlib.gunzipSync(data).toString(), 'abcdef');
zlib.gunzip(data, common.mustCall((err, result) => {
assert.ifError(err);
assert.equal(result, 'abcdef', 'result should match original string');
}));
zlib.unzip(data, common.mustCall((err, result) => {
assert.ifError(err);
assert.equal(result, 'abcdef', 'result should match original string');
}));
// 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.equal(result, 'abc', 'result should match contents of first "member"');
}));
// 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 = path.join(common.fixturesDir, 'pseudo-multimember-gzip.z');
const pmmFileGz = path.join(common.fixturesDir, '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(() => {
assert.deepStrictEqual(Buffer.concat(pmmResultBuffers), pmmExpected,
'result should match original random garbage');
}));
// 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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