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zlib: improve zlib errors #18675

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zlib: improve zlib errors
joyeecheung Feb 8, 2018
5bd9dba
squash! inline checkRanges, faster return for common cases
joyeecheung Feb 19, 2018
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158 changes: 78 additions & 80 deletions lib/zlib.js
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Original file line number Diff line number Diff line change
Expand Up @@ -156,6 +156,52 @@ function flushCallback(level, strategy, callback) {
}
}

// 1. Returns false for undefined and NaN
// 2. Returns true for finite numbers
// 3. Throws ERR_INVALID_ARG_TYPE for non-numbers
// 4. Throws ERR_OUT_OF_RANGE for infinite numbers
function checkFiniteNumber(number, name) {
// Common case
if (number === undefined || Number.isNaN(number)) {
return false;
}

if (Number.isFinite(number)) {
return true; // is a valid number
}

// Other non-numbers
if (typeof number !== 'number') {
const err = new errors.TypeError('ERR_INVALID_ARG_TYPE', name,
'number', number);
Error.captureStackTrace(err, checkFiniteNumber);
throw err;
}

// Infinite numbers
const err = new errors.RangeError('ERR_OUT_OF_RANGE', name,
'a finite number', number);
Error.captureStackTrace(err, checkFiniteNumber);
throw err;
}

// 1. Returns def for undefined and NaN
// 2. Returns number for finite numbers >= lower and <= upper
// 3. Throws ERR_INVALID_ARG_TYPE for non-numbers
// 4. Throws ERR_OUT_OF_RANGE for infinite numbers or numbers > upper or < lower
function checkRangesOrGetDefault(number, name, lower, upper, def) {
if (!checkFiniteNumber(number, name, lower, upper)) {
return def;
}
if (number < lower || number > upper) {
const err = new errors.RangeError('ERR_OUT_OF_RANGE', name,
`>= ${lower} and <= ${upper}`, number);
Error.captureStackTrace(err, checkRangesOrGetDefault);
throw err;
}
return number;
}

// the Zlib class they all inherit from
// This thing manages the queue of requests, and returns
// true or false if there is anything in the queue when
Expand All @@ -170,95 +216,53 @@ function Zlib(opts, mode) {
var strategy = Z_DEFAULT_STRATEGY;
var dictionary;

if (typeof mode !== 'number')
throw new errors.TypeError('ERR_INVALID_ARG_TYPE', 'mode', 'number');
if (mode < DEFLATE || mode > UNZIP)
throw new errors.RangeError('ERR_OUT_OF_RANGE', 'mode');
// The Zlib class is not exported to user land, the mode should only be
// passed in by us.
assert(typeof mode === 'number');
assert(mode >= DEFLATE && mode <= UNZIP);

if (opts) {
chunkSize = opts.chunkSize;
if (chunkSize !== undefined && !Number.isNaN(chunkSize)) {
if (chunkSize < Z_MIN_CHUNK || !Number.isFinite(chunkSize))
throw new errors.RangeError('ERR_INVALID_OPT_VALUE',
'chunkSize',
chunkSize);
} else {
if (!checkFiniteNumber(chunkSize, 'options.chunkSize')) {
chunkSize = Z_DEFAULT_CHUNK;
} else if (chunkSize < Z_MIN_CHUNK) {
throw new errors.RangeError('ERR_OUT_OF_RANGE', 'options.chunkSize',
`>= ${Z_MIN_CHUNK}`, chunkSize);
}

flush = opts.flush;
if (flush !== undefined && !Number.isNaN(flush)) {
if (flush < Z_NO_FLUSH || flush > Z_BLOCK || !Number.isFinite(flush))
throw new errors.RangeError('ERR_INVALID_OPT_VALUE', 'flush', flush);
} else {
flush = Z_NO_FLUSH;
}
flush = checkRangesOrGetDefault(
opts.flush, 'options.flush',
Z_NO_FLUSH, Z_BLOCK, Z_NO_FLUSH);
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@BridgeAR BridgeAR Feb 18, 2018

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Hm, I just had a closer look and the values get initialized with their default value at the top of the function. So we can actually skip setting the variable again.

It is only necessary to set the variable in case a finite number got passed in. So I personally think it would still be best to have:

if (checkRange(opts.flush, 'options.flush', Z_NO_FLUSH, Z_BLOCK))
  flush = opts.flush;

But setting the value again is of course also not much overhead.


finishFlush = opts.finishFlush;
if (finishFlush !== undefined && !Number.isNaN(finishFlush)) {
if (finishFlush < Z_NO_FLUSH || finishFlush > Z_BLOCK ||
!Number.isFinite(finishFlush)) {
throw new errors.RangeError('ERR_INVALID_OPT_VALUE',
'finishFlush',
finishFlush);
}
} else {
finishFlush = Z_FINISH;
}
finishFlush = checkRangesOrGetDefault(
opts.finishFlush, 'options.finishFlush',
Z_NO_FLUSH, Z_BLOCK, Z_FINISH);

windowBits = opts.windowBits;
if (windowBits !== undefined && !Number.isNaN(windowBits)) {
if (windowBits < Z_MIN_WINDOWBITS || windowBits > Z_MAX_WINDOWBITS ||
!Number.isFinite(windowBits)) {
throw new errors.RangeError('ERR_INVALID_OPT_VALUE',
'windowBits',
windowBits);
}
} else {
windowBits = Z_DEFAULT_WINDOWBITS;
}
windowBits = checkRangesOrGetDefault(
opts.windowBits, 'options.windowBits',
Z_MIN_WINDOWBITS, Z_MAX_WINDOWBITS, Z_DEFAULT_WINDOWBITS);

level = opts.level;
if (level !== undefined && !Number.isNaN(level)) {
if (level < Z_MIN_LEVEL || level > Z_MAX_LEVEL ||
!Number.isFinite(level)) {
throw new errors.RangeError('ERR_INVALID_OPT_VALUE',
'level', level);
}
} else {
level = Z_DEFAULT_COMPRESSION;
}
level = checkRangesOrGetDefault(
opts.level, 'options.level',
Z_MIN_LEVEL, Z_MAX_LEVEL, Z_DEFAULT_COMPRESSION);

memLevel = opts.memLevel;
if (memLevel !== undefined && !Number.isNaN(memLevel)) {
if (memLevel < Z_MIN_MEMLEVEL || memLevel > Z_MAX_MEMLEVEL ||
!Number.isFinite(memLevel)) {
throw new errors.RangeError('ERR_INVALID_OPT_VALUE',
'memLevel', memLevel);
}
} else {
memLevel = Z_DEFAULT_MEMLEVEL;
}
memLevel = checkRangesOrGetDefault(
opts.memLevel, 'options.memLevel',
Z_MIN_MEMLEVEL, Z_MAX_MEMLEVEL, Z_DEFAULT_MEMLEVEL);

strategy = opts.strategy;
if (strategy !== undefined && !Number.isNaN(strategy)) {
if (strategy < Z_DEFAULT_STRATEGY || strategy > Z_FIXED ||
!Number.isFinite(strategy)) {
throw new errors.TypeError('ERR_INVALID_OPT_VALUE',
'strategy', strategy);
}
} else {
strategy = Z_DEFAULT_STRATEGY;
}
strategy = checkRangesOrGetDefault(
opts.strategy, 'options.strategy',
Z_DEFAULT_STRATEGY, Z_FIXED, Z_DEFAULT_STRATEGY);

dictionary = opts.dictionary;
if (dictionary !== undefined && !isArrayBufferView(dictionary)) {
if (isAnyArrayBuffer(dictionary)) {
dictionary = Buffer.from(dictionary);
} else {
throw new errors.TypeError('ERR_INVALID_OPT_VALUE',
'dictionary',
dictionary);
throw new errors.TypeError(
'ERR_INVALID_ARG_TYPE', 'options.dictionary',
['Buffer', 'TypedArray', 'DataView', 'ArrayBuffer'],
dictionary);
}
}

Expand Down Expand Up @@ -310,14 +314,8 @@ Object.defineProperty(Zlib.prototype, '_closed', {
});

Zlib.prototype.params = function params(level, strategy, callback) {
if (level < Z_MIN_LEVEL || level > Z_MAX_LEVEL)
throw new errors.RangeError('ERR_INVALID_ARG_VALUE', 'level', level);

if (strategy !== undefined &&
(strategy < Z_DEFAULT_STRATEGY || strategy > Z_FIXED ||
!Number.isFinite(strategy))) {
throw new errors.TypeError('ERR_INVALID_ARG_VALUE', 'strategy', strategy);
}
checkRangesOrGetDefault(level, 'level', Z_MIN_LEVEL, Z_MAX_LEVEL);
checkRangesOrGetDefault(strategy, 'strategy', Z_DEFAULT_STRATEGY, Z_FIXED);

if (this._level !== level || this._strategy !== strategy) {
this.flush(Z_SYNC_FLUSH,
Expand Down
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