void
BitStreamFilterTest::testNoiseFilter() {
const char* name = "noise";
RefPointer<BitStreamFilter> f = BitStreamFilter::make(name);
// let's generate a buffer to add noise to.
const int32_t inSize = 1024;
// Annoyingly I have to add FF_INPUT_BUFFER_PADDING_SIZE because the noise
// filter incorrectly memcopies an additional 16 bytes, and I want Valgrind to
// not worry about that.
RefPointer<Buffer> inBuf = Buffer::make(0, inSize+FF_INPUT_BUFFER_PADDING_SIZE);
uint8_t* in = static_cast<uint8_t*>(inBuf->getBytes(0, inSize));
int32_t outSize = inSize;
RefPointer<Buffer> outBuf = Buffer::make(0, outSize+FF_INPUT_BUFFER_PADDING_SIZE);
uint8_t* out = static_cast<uint8_t*>(outBuf->getBytes(0, outSize));
for(int32_t i = 0; i < inSize+FF_INPUT_BUFFER_PADDING_SIZE; i++) {
in[i] = static_cast<uint8_t>(i);
out[i] = in[i];
}
outSize = f->filter(outBuf.value(), 0, inBuf.value(), 0, inSize, 0, 0, false);
TS_ASSERT_EQUALS(outSize, inSize);
int matches = 0;
for(int32_t i = 0; i < inSize; i++) {
if (in[i] == out[i])
++ matches;
}
// noise should make sure that not all elements match.
TS_ASSERT(matches < inSize);
}
void
BitStreamFilterTest::testChompFilter() {
const char* name = "chomp";
RefPointer<BitStreamFilter> f = BitStreamFilter::make(name);
// let's generate a buffer to chomp nulls off the end of.
const int32_t inSize = 1024;
RefPointer<Buffer> inBuf = Buffer::make(0, inSize);
uint8_t* in = static_cast<uint8_t*>(inBuf->getBytes(0, inSize));
int32_t outSize = inSize;
RefPointer<Buffer> outBuf = Buffer::make(0, outSize);
uint8_t* out = static_cast<uint8_t*>(outBuf->getBytes(0, outSize));
// set the entire input buffer to null for now.
memset(in, 0, inSize);
// then set the first half of the buffer to be non-null.
for(int32_t i = 0; i < inSize/2; i++) {
in[i] = 0x01;
out[i] = in[i];
}
// should filter out all the null bytes at the end.
outSize = f->filter(outBuf.value(), 0, inBuf.value(), 0, inSize, 0, 0, false);
TS_ASSERT_EQUALS(outSize, inSize/2);
for(int32_t i = 0; i < inSize/2; i++) {
TS_ASSERT_EQUALS(in[i], out[i]);
}
}