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_NATIVE_INPUT_STREAM_READER_H_ 6 #define ANDROID_WEBVIEW_NATIVE_INPUT_STREAM_READER_H_ 7 8 #include "base/memory/ref_counted.h" 9 10 namespace net { 11 class HttpByteRange; 12 class IOBuffer; 13 } 14 15 namespace android_webview { 16 17 class InputStream; 18 19 // Class responsible for reading the InputStream. 20 class InputStreamReader { 21 public: 22 // The constructor is called on the IO thread, not on the worker thread. 23 InputStreamReader(android_webview::InputStream* stream); 24 virtual ~InputStreamReader(); 25 26 // Perform a seek operation on the InputStream associated with this job. 27 // On successful completion the InputStream would have skipped reading the 28 // number of bytes equal to the lower range of |byte_range|. 29 // This method should be called on the |g_worker_thread| thread. 30 // 31 // |byte_range| is the range of bytes to be read from |stream| 32 // 33 // A negative return value will indicate an error code, a positive value 34 // will indicate the expected size of the content. 35 virtual int Seek(const net::HttpByteRange& byte_range); 36 37 // Read data from |stream_|. This method should be called on the 38 // |g_worker_thread| thread. 39 // 40 // A negative return value will indicate an error code, a positive value 41 // will indicate the expected size of the content. 42 virtual int ReadRawData(net::IOBuffer* buffer, int buffer_size); 43 44 private: 45 // Verify the requested range against the stream size. 46 // net::OK is returned on success, the error code otherwise. 47 int VerifyRequestedRange(net::HttpByteRange* byte_range, 48 int* content_size); 49 50 // Skip to the first byte of the requested read range. 51 // net::OK is returned on success, the error code otherwise. 52 int SkipToRequestedRange(const net::HttpByteRange& byte_range); 53 54 android_webview::InputStream* stream_; 55 56 DISALLOW_COPY_AND_ASSIGN(InputStreamReader); 57 }; 58 59 } // namespace android_webview 60 61 #endif // ANDROID_WEBVIEW_NATIVE_INPUT_STREAM_READER_H_ 62
