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fix(crc32): prevent readUInt32BE on <4-byte previous buffer #38

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fix(crc32): prevent readUInt32BE on <4-byte previous buffer #38

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2 changes: 1 addition & 1 deletion index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -56,7 +56,7 @@ function bufferizeInt(num) {
function _crc32(buf, previous) {
buf = ensureBuffer(buf);
if (Buffer.isBuffer(previous)) {
previous = previous.readUInt32BE(0);
previous = previous.length >= 4 ? previous.readUInt32BE(0) : 0;
}
let crc = ~~previous ^ -1;
for (var n = 0; n < buf.length; n++) {
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7 changes: 7 additions & 0 deletions tests/crc.test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -111,3 +111,10 @@ test('can do unsigned in append mode', function (t) {
t.same(crc, expected);
t.end();
});

test('no readUInt32BE on small previous buffer', function (t) {
var prev = Buffer.from([0xDE, 0xAD, 0xBE]);
var expected = Buffer.from([0x35, 0x24, 0x41, 0xc2]);
t.same(crc32("abc", ), expected);
t.end();
});