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// Compare two Uint8Arrays.
function compareArrays(actual, expected) {
assert_true(actual instanceof Uint8Array, 'actual is Uint8Array');
assert_true(expected instanceof Uint8Array, 'expected is Uint8Array');
assert_equals(actual.byteLength, expected.byteLength, 'lengths equal');
for (let i = 0; i < expected.byteLength; ++i)
assert_equals(actual[i], expected[i], `Mismatch at position ${i}.`);
}
// Reads from |reader| until at least |targetLength| is read or the stream is
// closed. The data is returned as a combined Uint8Array.
async function readWithLength(reader, targetLength) {
const chunks = [];
let actualLength = 0;
while (true) {
let {value, done} = await reader.read();
chunks.push(value);
actualLength += value.byteLength;
if (actualLength >= targetLength || done) {
// It would be better to allocate |buffer| up front with the number of
// of bytes expected but this is the best that can be done without a
// BYOB reader to control the amount of data read.
const buffer = new Uint8Array(actualLength);
chunks.reduce((offset, chunk) => {
buffer.set(chunk, offset);
return offset + chunk.byteLength;
}, 0);
return buffer;
}
}
}
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