bool FrontBufferedStream::isAtEnd() const {
if (fOffset < fBufferedSoFar) {
// Even if the underlying stream is at the end, this stream has been
// rewound after buffering, so it is not at the end.
return false;
}
return fStream->isAtEnd();
}
size_t FrontBufferedStream::read(void* voidDst, size_t size) {
// Cast voidDst to a char* for easy addition.
char* dst = reinterpret_cast<char*>(voidDst);
SkDEBUGCODE(const size_t totalSize = size;)
const size_t start = fOffset;
// First, read any data that was previously buffered.
if (fOffset < fBufferedSoFar) {
const size_t bytesCopied = this->readFromBuffer(dst, size);
// Update the remaining number of bytes needed to read
// and the destination buffer.
size -= bytesCopied;
SkASSERT(size + (fOffset - start) == totalSize);
if (dst != NULL) {
dst += bytesCopied;
}
}
// Buffer any more data that should be buffered, and copy it to the
// destination.
if (size > 0 && fBufferedSoFar < fBufferSize && !fStream->isAtEnd()) {
const size_t buffered = this->bufferAndWriteTo(dst, size);
// Update the remaining number of bytes needed to read
// and the destination buffer.
size -= buffered;
SkASSERT(size + (fOffset - start) == totalSize);
if (dst != NULL) {
dst += buffered;
}
}
if (size > 0 && !fStream->isAtEnd()) {
SkDEBUGCODE(const size_t bytesReadDirectly =) this->readDirectlyFromStream(dst, size);
SkDEBUGCODE(size -= bytesReadDirectly;)
