1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef ANDROID_WEBVIEW_BROWSER_INPUT_STREAM_H_ 6 #define ANDROID_WEBVIEW_BROWSER_INPUT_STREAM_H_ 7 8 #include "base/basictypes.h" 9 10 namespace net { 11 class IOBuffer; 12 } 13 14 namespace android_webview { 15 16 // Abstract wrapper used to access the InputStream Java class. 17 // This class is safe to pass around between threads (the destructor, 18 // constructor and methods can be called on different threads) but calling 19 // methods concurrently might have undefined results. 20 class InputStream { 21 public: ~InputStream()22 virtual ~InputStream() {} 23 24 // Sets |bytes_available| to the number of bytes that can be read (or skipped 25 // over) from this input stream without blocking by the next caller of a 26 // method for this input stream. 27 // Returns true if completed successfully or false if an exception was 28 // thrown. 29 virtual bool BytesAvailable(int* bytes_available) const = 0; 30 31 // Skips over and discards |n| bytes of data from this input stream. Sets 32 // |bytes_skipped| to the number of of bytes skipped. 33 // Returns true if completed successfully or false if an exception was 34 // thrown. 35 virtual bool Skip(int64_t n, int64_t* bytes_skipped) = 0; 36 37 // Reads at most |length| bytes into |dest|. Sets |bytes_read| to the total 38 // number of bytes read into |dest| or 0 if there is no more data because the 39 // end of the stream was reached. 40 // |dest| must be at least |length| in size. 41 // Returns true if completed successfully or false if an exception was 42 // thrown. 43 virtual bool Read(net::IOBuffer* dest, int length, int* bytes_read) = 0; 44 45 protected: InputStream()46 InputStream() {} 47 }; 48 49 } // namespace android_webview 50 51 #endif // ANDROID_WEBVIEW_BROWSER_INPUT_STREAM_H_ 52