* found in the LICENSE file.
*/
-#include "SkStream.h"
-#include "SkTemplates.h"
+#include "SkTypes.h"
+
+class SkStream;
+class SkStreamRewindable;
/**
- * Specialized stream that only buffers the first X bytes of a stream,
+ * Specialized stream that buffers the first X bytes of a stream,
* where X is passed in by the user. Note that unlike some buffered
- * stream APIs, once more than those bytes are read, no more buffering
- * is done. This stream is designed for a use case where the caller
- * knows that rewind will only be called from within X bytes (inclusive),
- * and the wrapped stream is not necessarily able to rewind at all.
+ * stream APIs, once more bytes than can fit in the buffer are read,
+ * no more buffering is done. This stream is designed for a use case
+ * where the caller knows that rewind will only be called from within
+ * X bytes (inclusive), and the wrapped stream is not necessarily
+ * able to rewind at all.
*/
-class SkFrontBufferedStream : public SkStreamRewindable {
+class SkFrontBufferedStream {
public:
/**
- * Creates a new stream that wraps and buffers SkStream.
- * @param stream SkStream to buffer. If NULL, NULL is returned. After
- * this call, unref stream and do not refer to it.
- * SkFrontBufferedStream is expected to be its only owner.
- * @param bufferSize Exact size of the buffer to be used.
- * @return An SkStream that can buffer up to bufferSize.
+ * Creates a new stream that wraps and buffers an SkStream.
+ * @param stream SkStream to buffer. If stream is NULL, NULL is
+ * returned. When this call succeeds (i.e. returns non NULL),
+ * SkFrontBufferedStream is expected to be the only owner of
+ * stream, so it should be unreffed and no longer used directly.
+ * @param minBufferSize Minimum size of buffer required.
+ * @return An SkStream that can buffer at least minBufferSize, or
+ * NULL on failure.
*/
- static SkStreamRewindable* Create(SkStream* stream, size_t bufferSize);
-
- virtual size_t read(void* buffer, size_t size) SK_OVERRIDE;
-
- virtual bool isAtEnd() const SK_OVERRIDE;
-
- virtual bool rewind() SK_OVERRIDE;
-
- virtual bool hasPosition() const SK_OVERRIDE { return true; }
-
- virtual size_t getPosition() const SK_OVERRIDE { return fOffset; }
-
- virtual bool hasLength() const SK_OVERRIDE;
-
- virtual size_t getLength() const SK_OVERRIDE;
-
- virtual SkStreamRewindable* duplicate() const SK_OVERRIDE { return NULL; }
-
-private:
- SkAutoTUnref<SkStream> fStream;
- // Current offset into the stream. Always >= 0.
- size_t fOffset;
- // Amount that has been buffered by calls to read. Will always be less than
- // fBufferSize.
- size_t fBufferedSoFar;
- // Total size of the buffer.
- const size_t fBufferSize;
- SkAutoTMalloc<char> fBuffer;
-
- // Private. Use Create.
- SkFrontBufferedStream(SkStream*, size_t bufferSize);
-
- // Read up to size bytes from already buffered data, and copy to
- // dst, if non-NULL. Updates fOffset. Assumes that fOffset is less
- // than fBufferedSoFar.
- size_t readFromBuffer(char* dst, size_t size);
-
- // Buffer up to size bytes from the stream, and copy to dst if non-
- // NULL. Updates fOffset and fBufferedSoFar. Assumes that fOffset is
- // less than fBufferedSoFar, and size is greater than 0.
- size_t bufferAndWriteTo(char* dst, size_t size);
-
- // Read up to size bytes directly from the stream and into dst if non-
- // NULL. Updates fOffset. Assumes fOffset is at or beyond the buffered
- // data, and size is greater than 0.
- size_t readDirectlyFromStream(char* dst, size_t size);
-
- typedef SkStream INHERITED;
+ static SkStreamRewindable* Create(SkStream* stream, size_t minBufferSize);
};
*/
#include "SkFrontBufferedStream.h"
+#include "SkStream.h"
+#include "SkTemplates.h"
+
+class FrontBufferedStream : public SkStreamRewindable {
+public:
+ // Called by Create.
+ FrontBufferedStream(SkStream*, size_t bufferSize);
+
+ virtual size_t read(void* buffer, size_t size) SK_OVERRIDE;
+
+ virtual bool isAtEnd() const SK_OVERRIDE;
+
+ virtual bool rewind() SK_OVERRIDE;
+
+ virtual bool hasPosition() const SK_OVERRIDE { return true; }
+
+ virtual size_t getPosition() const SK_OVERRIDE { return fOffset; }
+
+ virtual bool hasLength() const SK_OVERRIDE;
+
+ virtual size_t getLength() const SK_OVERRIDE;
+
+ virtual SkStreamRewindable* duplicate() const SK_OVERRIDE { return NULL; }
+
+private:
+ SkAutoTUnref<SkStream> fStream;
+ // Current offset into the stream. Always >= 0.
+ size_t fOffset;
+ // Amount that has been buffered by calls to read. Will always be less than
+ // fBufferSize.
+ size_t fBufferedSoFar;
+ // Total size of the buffer.
+ const size_t fBufferSize;
+ // FIXME: SkAutoTMalloc throws on failure. Instead, Create should return a
+ // NULL stream.
+ SkAutoTMalloc<char> fBuffer;
+
+ // Read up to size bytes from already buffered data, and copy to
+ // dst, if non-NULL. Updates fOffset. Assumes that fOffset is less
+ // than fBufferedSoFar.
+ size_t readFromBuffer(char* dst, size_t size);
+
+ // Buffer up to size bytes from the stream, and copy to dst if non-
+ // NULL. Updates fOffset and fBufferedSoFar. Assumes that fOffset is
+ // less than fBufferedSoFar, and size is greater than 0.
+ size_t bufferAndWriteTo(char* dst, size_t size);
+
+ // Read up to size bytes directly from the stream and into dst if non-
+ // NULL. Updates fOffset. Assumes fOffset is at or beyond the buffered
+ // data, and size is greater than 0.
+ size_t readDirectlyFromStream(char* dst, size_t size);
+
+ typedef SkStream INHERITED;
+};
SkStreamRewindable* SkFrontBufferedStream::Create(SkStream* stream, size_t bufferSize) {
if (NULL == stream) {
return NULL;
}
- return SkNEW_ARGS(SkFrontBufferedStream, (stream, bufferSize));
+ return SkNEW_ARGS(FrontBufferedStream, (stream, bufferSize));
}
-SkFrontBufferedStream::SkFrontBufferedStream(SkStream* stream, size_t bufferSize)
+FrontBufferedStream::FrontBufferedStream(SkStream* stream, size_t bufferSize)
: fStream(SkRef(stream))
, fOffset(0)
, fBufferedSoFar(0)
, fBufferSize(bufferSize)
, fBuffer(bufferSize) {}
-bool SkFrontBufferedStream::isAtEnd() const {
+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 fStream->isAtEnd();
}
-bool SkFrontBufferedStream::rewind() {
+bool FrontBufferedStream::rewind() {
// Only allow a rewind if we have not exceeded the buffer.
if (fOffset <= fBufferSize) {
fOffset = 0;
return false;
}
-bool SkFrontBufferedStream::hasLength() const {
+bool FrontBufferedStream::hasLength() const {
return fStream->hasLength();
}
-size_t SkFrontBufferedStream::getLength() const {
+size_t FrontBufferedStream::getLength() const {
return fStream->getLength();
}
-size_t SkFrontBufferedStream::readFromBuffer(char* dst, size_t size) {
+size_t FrontBufferedStream::readFromBuffer(char* dst, size_t size) {
SkASSERT(fOffset < fBufferedSoFar);
// Some data has already been copied to fBuffer. Read up to the
// lesser of the size requested and the remainder of the buffered
return bytesToCopy;
}
-size_t SkFrontBufferedStream::bufferAndWriteTo(char* dst, size_t size) {
+size_t FrontBufferedStream::bufferAndWriteTo(char* dst, size_t size) {
SkASSERT(size > 0);
SkASSERT(fOffset >= fBufferedSoFar);
// Data needs to be buffered. Buffer up to the lesser of the size requested
return buffered;
}
-size_t SkFrontBufferedStream::readDirectlyFromStream(char* dst, size_t size) {
+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);
return bytesReadDirectly;
}
-size_t SkFrontBufferedStream::read(void* voidDst, size_t size) {
+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;)
projects / platform / upstream / libSkiaSharp.git / commitdiff