Esempio n. 1
0
size_t FrontBufferedStream::readDirectlyFromStream(char* dst, size_t size) {
    SkASSERT(size > 0);
    // If we get here, we have buffered all that can be buffered.
    SkASSERT(fBufferSize == fBufferedSoFar && fOffset >= fBufferSize);

    const size_t bytesReadDirectly = fStream->read(dst, size);
    fOffset += bytesReadDirectly;

    // If we have read past the end of the buffer, rewinding is no longer
    // supported, so we can go ahead and free the memory.
    if (bytesReadDirectly > 0) {
        sk_free(fBuffer.detach());
    }

    return bytesReadDirectly;
}
Esempio n. 2
0
size_t FrontBufferedStream::bufferAndWriteTo(char* dst, size_t size) {
    SkASSERT(size > 0);
    SkASSERT(fOffset >= fBufferedSoFar);
    SkASSERT(fBuffer);
    // Data needs to be buffered. Buffer up to the lesser of the size requested
    // and the remainder of the max buffer size.
    const size_t bytesToBuffer = SkTMin(size, fBufferSize - fBufferedSoFar);
    char* buffer = fBuffer + fOffset;
    const size_t buffered = fStream->read(buffer, bytesToBuffer);

    fBufferedSoFar += buffered;
    fOffset = fBufferedSoFar;
    SkASSERT(fBufferedSoFar <= fBufferSize);

    // Copy the buffer to the destination buffer and update the amount read.
    if (dst != NULL) {
        memcpy(dst, buffer, buffered);
    }

    return buffered;
}