mozilla-central/dom/streams/test/xpcshell/large-pipeto.js (file symbol)

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Test Info: Warnings

const { AppConstants } = ChromeUtils.importESModule(
"resource://gre/modules/AppConstants.sys.mjs"
);
// Stamp an array buffer with a pattern; verified by verify_chunk below.
function init(array) {
for (var i = 0; i < array.length; i++) {
array[i] = i % 256;
}
}
// The construction of the file below ends up with 12 instances
// of the array buffer -- we want this to be larger than 2**32 bytes
// to exercise potential truncation of nsIInputStream::Read's count
// parameter.
const ABLENGTH = (2 ** 32 + 8) / 12;
// Get a large file (bigger than 2GB!)
function get_file() {
const array = new ArrayBuffer(ABLENGTH);
const buff = new Uint8Array(array);
// Stamp with pattern.
init(buff);
const blob = new Blob([buff, buff], {});
return new File([blob, blob, blob, blob, blob, blob], {});
}
// Verify that the chunks the stream recieve correspond to the initialization
function verify_chunk(chunk, verification_state) {
for (var j = 0; j < chunk.length; j++) {
// If we don't match the fill pattern.
if (chunk[j] != verification_state.expected) {
// we ran out of array buffer; so we should be looking at the first byte of the array again.
if (
verification_state.total_index % ABLENGTH != 0 ||
chunk[j] != 0 /* ASSUME THAT THE INITIALIZATION OF THE BUFFER IS ZERO */
) {
throw new Error(
`Mismatch: chunk[${j}] (${chunk[j]}) != ${verification_state.expected} (total_index ${verification_state.total_index})`
);
}
// Reset the fill expectation to 1 for next round.
verification_state.expected = 1;
} else {
// We are inside regular fill section
verification_state.expected = (verification_state.expected + 1) % 256;
}
verification_state.total_index++;
}
}
// Pipe To Testing: Win32 can't handle the file size created in this test and OOMs.
add_task(
{
skip_if: () => AppConstants.platform == "win" && !Services.appinfo.is64Bit,
},
async () => {
var chunk_verification_state = {
expected: 0,
total_index: 0,
};
const file = get_file();
await file.stream().pipeTo(
new WritableStream({
write(chunk) {
verify_chunk(chunk, chunk_verification_state);
},
})
);
}
);
// Do the same test as above, but this time don't use pipeTo.
add_task(
{
skip_if: () => AppConstants.platform == "win" && !Services.appinfo.is64Bit,
},
async () => {
var file = get_file();
var chunk_verification_state = {
expected: 0,
total_index: 0,
};
var streamReader = file.stream().getReader();
while (true) {
var res = await streamReader.read();
if (res.done) {
break;
}
var chunk = res.value;
verify_chunk(chunk, chunk_verification_state);
}
}
);