// Tests reading the stream across boundaries of what has been buffered so far and what
// the total buffer size is.
static void test_incremental_buffering(skiatest::Reporter* reporter, size_t bufferSize) {
// NOTE: For this and other tests in this file, we cheat and continue to refer to the
// wrapped stream, but that's okay because we know the wrapping stream has not been
// deleted yet (and we only call const methods in it).
SkMemoryStream* memStream = SkNEW_ARGS(SkMemoryStream, (gAbcs, strlen(gAbcs), false));
SkAutoTDelete<SkStream> bufferedStream(SkFrontBufferedStream::Create(memStream, bufferSize));
test_hasLength(reporter, *bufferedStream.get(), *memStream);
// First, test reading less than the max buffer size.
test_read(reporter, bufferedStream, gAbcs, bufferSize / 2);
// Now test rewinding back to the beginning and reading less than what was
// already buffered.
test_rewind(reporter, bufferedStream, true);
test_read(reporter, bufferedStream, gAbcs, bufferSize / 4);
// Now test reading part of what was buffered, and buffering new data.
test_read(reporter, bufferedStream, gAbcs + bufferedStream->getPosition(), bufferSize / 2);
// Now test reading what was buffered, buffering new data, and
// reading directly from the stream.
test_rewind(reporter, bufferedStream, true);
test_read(reporter, bufferedStream, gAbcs, bufferSize << 1);
// We have reached the end of the buffer, so rewinding will fail.
// This test assumes that the stream is larger than the buffer; otherwise the
// result of rewind should be true.
test_rewind(reporter, bufferedStream, false);
}
static void test_perfectly_sized_buffer(skiatest::Reporter* reporter, size_t bufferSize) {
SkMemoryStream* memStream = SkNEW_ARGS(SkMemoryStream, (gAbcs, strlen(gAbcs), false));
SkAutoTDelete<SkStream> bufferedStream(SkFrontBufferedStream::Create(memStream, bufferSize));
test_hasLength(reporter, *bufferedStream.get(), *memStream);
// Read exactly the amount that fits in the buffer.
test_read(reporter, bufferedStream, gAbcs, bufferSize);
// Rewinding should succeed.
test_rewind(reporter, bufferedStream, true);
// Once again reading buffered info should succeed
test_read(reporter, bufferedStream, gAbcs, bufferSize);
// Read past the size of the buffer. At this point, we cannot return.
test_read(reporter, bufferedStream, gAbcs + bufferedStream->getPosition(), 1);
test_rewind(reporter, bufferedStream, false);
}
static void test_skipping(skiatest::Reporter* reporter, size_t bufferSize) {
SkMemoryStream* memStream = SkNEW_ARGS(SkMemoryStream, (gAbcs, strlen(gAbcs), false));
SkAutoTDelete<SkStream> bufferedStream(SkFrontBufferedStream::Create(memStream, bufferSize));
test_hasLength(reporter, *bufferedStream.get(), *memStream);
// Skip half the buffer.
bufferedStream->skip(bufferSize / 2);
// Rewind, then read part of the buffer, which should have been read.
test_rewind(reporter, bufferedStream, true);
test_read(reporter, bufferedStream, gAbcs, bufferSize / 4);
// Now skip beyond the buffered piece, but still within the total buffer.
bufferedStream->skip(bufferSize / 2);
// Test that reading will still work.
test_read(reporter, bufferedStream, gAbcs + bufferedStream->getPosition(), bufferSize / 4);
test_rewind(reporter, bufferedStream, true);
test_read(reporter, bufferedStream, gAbcs, bufferSize);
}
// This test ensures that buffering the exact length of the stream and attempting to read beyond it
// does not invalidate the buffer.
static void test_read_beyond_buffer(skiatest::Reporter* reporter, size_t bufferSize) {
// Use a stream that behaves like Android's stream.
AndroidLikeMemoryStream* memStream =
new AndroidLikeMemoryStream((void*)gAbcs, bufferSize, false);
// Create a buffer that matches the length of the stream.
std::unique_ptr<SkStream> bufferedStream(SkFrontBufferedStream::Create(memStream, bufferSize));
test_hasLength(reporter, *bufferedStream.get(), *memStream);
// Attempt to read one more than the bufferSize
test_read(reporter, bufferedStream.get(), gAbcs, bufferSize + 1);
test_rewind(reporter, bufferedStream.get(), true);
// Ensure that the initial read did not invalidate the buffer.
test_read(reporter, bufferedStream.get(), gAbcs, bufferSize);
}
DEF_TEST(Writer32_misc, reporter) {
test_reserve(reporter);
test_string_null(reporter);
test_ptr(reporter);
test_rewind(reporter);
}