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Update fuzz.js Improve Fuzzing Coverage and Robustness in fuzz.js for OSS-Fuzz Integration #12827

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Update fuzz.js Improve Fuzzing Coverage and Robustness in fuzz.js for OSS-Fuzz Integration #12827

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66 changes: 53 additions & 13 deletions projects/pako/fuzz.js
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Original file line number Diff line number Diff line change
Expand Up @@ -23,10 +23,10 @@ module.exports.fuzz = function(data) {

try {
if (choice === true) {
const comprLevel = fdp.consumeIntegral(1);
const windowBits = fdp.consumeIntegral(1);
const memLevel = fdp.consumeIntegral(1);
const strategy = fdp.consumeIntegral(1);
const comprLevel = fdp.consumeIntegralInRange(0, 9); // Valid compression levels: 0-9
const windowBits = fdp.consumeIntegralInRange(8, 15); // Valid window bits
const memLevel = fdp.consumeIntegralInRange(1, 9); // Valid memory levels
const strategy = fdp.consumeIntegralInRange(0, 4); // Valid strategies
const raw = fdp.consumeBoolean();
const input = fdp.consumeRemainingAsBytes();
const options = {
Expand All @@ -36,36 +36,76 @@ module.exports.fuzz = function(data) {
strategy: strategy,
raw: raw
};

// Compress and decompress with deflate and inflate
const defl = pako.deflate(input, options);
pako.inflate(defl, options);
const decompressed = pako.inflate(defl, options);

// Validate the output matches the input
if (!arraysEqual(decompressed, input)) {
throw new Error('Decompressed data does not match original input');
}

// Test deflateRaw and inflateRaw
const deflRaw = pako.deflateRaw(input, options);
pako.inflateRaw(deflRaw, options);
const decompressedRaw = pako.inflateRaw(deflRaw, options);
if (!arraysEqual(decompressedRaw, input)) {
throw new Error('Decompressed raw data does not match original input');
}

} else {
// Generate random and edge-case options for gzip
const gzipOptions = {
level: fdp.consumeIntegral(1),
level: fdp.consumeIntegralInRange(0, 9),
raw: fdp.consumeBoolean(),
to: fdp.consumeBoolean(),
windowBits: fdp.consumeIntegral(1),
memLevel: fdp.consumeIntegral(1),
strategy: fdp.consumeIntegral(1)
to: fdp.consumeString(10),
windowBits: fdp.consumeIntegralInRange(8, 15),
memLevel: fdp.consumeIntegralInRange(1, 9),
strategy: fdp.consumeIntegralInRange(0, 4),
header: {
text: fdp.consumeBoolean(),
time: fdp.consumeIntegral(),
os: fdp.consumeIntegralInRange(0, 255),
extra: fdp.consumeRemainingAsBytes()
}
};
const input = fdp.consumeRemainingAsBytes();

// Compress and decompress with gzip and ungzip
const gzip = pako.gzip(input, gzipOptions);
pako.ungzip(gzip, gzipOptions);
const decompressedGzip = pako.ungzip(gzip, gzipOptions);
if (!arraysEqual(decompressedGzip, input)) {
throw new Error('Decompressed gzip data does not match original input');
}

// Test inflate and inflateRaw
pako.inflate(gzip);
pako.inflateRaw(gzip);
}
} catch (error) {
if (error.message && !ignoredError(error)) {
console.error('Unhandled error:', error.message);
throw error;
}
}
};

// Helper function to compare byte arrays
function arraysEqual(a, b) {
if (a.length !== b.length) return false;
for (let i = 0; i < a.length; i++) {
if (a[i] !== b[i]) return false;
}
return true;
}

// Define ignored errors to avoid unnecessary crashes
function ignoredError(error) {
return !!ignored.find((message) => error.message.indexOf(message) !== -1);
console.error('Error encountered:', error.message);
return !!ignored.find((message) => error.message.includes(message));
}

// List of errors to ignore
const ignored = [
'stream error',
'invalid window size',
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