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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_EMBEDDER_SUPPORT_ANDROID_UTIL_INPUT_STREAM_H_
#define COMPONENTS_EMBEDDER_SUPPORT_ANDROID_UTIL_INPUT_STREAM_H_
#include <stdint.h>
#include <memory>
#include "base/android/scoped_java_ref.h"
#include "base/compiler_specific.h"
#include "base/feature_list.h"
#include "third_party/jni_zero/default_conversions.h"
namespace net {
class IOBuffer;
}
namespace embedder_support {
BASE_DECLARE_FEATURE(kEnableCustomInputStreamBufferSize);
// Abstract wrapper used to access the InputStream Java class.
// This class is safe to pass around between threads (the destructor,
// constructor and methods can be called on different threads) but calling
// methods concurrently might have undefined results.
class InputStream {
public:
// Returns the size to be used for the intermediate buffer to copy from Java's
// InputStream into C++'s net::IOBuffer.
static int GetIntermediateBufferSize();
// |stream| should be an instance of the InputStream Java class.
// |stream| can't be null.
explicit InputStream(const base::android::JavaRef<jobject>& stream);
InputStream(const InputStream&) = delete;
InputStream& operator=(const InputStream&) = delete;
virtual ~InputStream();
// Gets the underlying Java object. Guaranteed non-NULL.
const base::android::JavaRef<jobject>& jobj() const { return jobject_; }
// Sets |bytes_available| to the number of bytes that can be read (or skipped
// over) from this input stream without blocking by the next caller of a
// method for this input stream.
// Returns true if completed successfully or false if an exception was
// thrown.
virtual bool BytesAvailable(int* bytes_available) const;
// Skips over and discards |n| bytes of data from this input stream. Sets
// |bytes_skipped| to the number of of bytes skipped.
// Returns true if completed successfully or false if an exception was
// thrown.
virtual bool Skip(int64_t n, int64_t* bytes_skipped);
// Reads at most |length| bytes into |dest|. Sets |bytes_read| to the total
// number of bytes read into |dest| or 0 if there is no more data because the
// end of the stream was reached.
// |dest| must be at least |length| in size.
// Returns true if completed successfully or false if an exception was
// thrown.
virtual bool Read(net::IOBuffer* dest, int length, int* bytes_read);
protected:
// Parameterless constructor exposed for testing.
InputStream();
private:
base::android::ScopedJavaGlobalRef<jobject> jobject_;
base::android::ScopedJavaGlobalRef<jbyteArray> buffer_;
int total_bytes_read_ = 0;
};
} // namespace embedder_support
namespace jni_zero {
template <>
inline std::unique_ptr<embedder_support::InputStream> FromJniType(
JNIEnv* env,
const base::android::JavaRef<jobject>& jstream) {
if (!jstream) {
return nullptr;
}
return std::make_unique<embedder_support::InputStream>(jstream);
}
} // namespace jni_zero
#endif // COMPONENTS_EMBEDDER_SUPPORT_ANDROID_UTIL_INPUT_STREAM_H_
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