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| 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 #include "android_webview/native/input_stream_impl.h" | |
| 6 | |
| 7 #include "base/android/jni_android.h" | |
| 8 // Disable "Warnings treated as errors" for input_stream_jni as it's a Java | |
| 9 // system class and we have to generate C++ hooks for all methods in the class | |
| 10 // even if they're unused. | |
| 11 #pragma GCC diagnostic push | |
| 12 #pragma GCC diagnostic ignored "-Wunused-function" | |
| 13 #include "jni/InputStreamUtil_jni.h" | |
| 14 #pragma GCC diagnostic pop | |
| 15 #include "net/base/io_buffer.h" | |
| 16 | |
| 17 using base::android::AttachCurrentThread; | |
| 18 using base::android::ClearException; | |
| 19 using base::android::JavaRef; | |
| 20 | |
| 21 namespace android_webview { | |
| 22 | |
| 23 namespace { | |
| 24 | |
| 25 // This should be the same as InputStramUtil.EXCEPTION_THROWN_STATUS. | |
| 26 const int kExceptionThrownStatusCode = -2; | |
| 27 | |
| 28 } | |
| 29 | |
| 30 // Maximum number of bytes to be read in a single read. | |
| 31 const int InputStreamImpl::kBufferSize = 4096; | |
| 32 | |
| 33 // static | |
| 34 const InputStreamImpl* InputStreamImpl::FromInputStream( | |
| 35 const InputStream* input_stream) { | |
| 36 return static_cast<const InputStreamImpl*>(input_stream); | |
| 37 } | |
| 38 | |
| 39 // TODO: Use unsafe version for all Java_InputStream methods in this file | |
| 40 // once BUG 157880 is fixed and implement graceful exception handling. | |
| 41 | |
| 42 InputStreamImpl::InputStreamImpl() { | |
| 43 } | |
| 44 | |
| 45 InputStreamImpl::InputStreamImpl(const JavaRef<jobject>& stream) | |
| 46 : jobject_(stream) { | |
| 47 DCHECK(!stream.is_null()); | |
| 48 } | |
| 49 | |
| 50 InputStreamImpl::~InputStreamImpl() { | |
| 51 JNIEnv* env = AttachCurrentThread(); | |
| 52 Java_InputStreamUtil_close(env, jobject_); | |
| 53 } | |
| 54 | |
| 55 bool InputStreamImpl::BytesAvailable(int* bytes_available) const { | |
| 56 JNIEnv* env = AttachCurrentThread(); | |
| 57 int bytes = Java_InputStreamUtil_available(env, jobject_); | |
| 58 if (bytes == kExceptionThrownStatusCode) | |
| 59 return false; | |
| 60 *bytes_available = bytes; | |
| 61 return true; | |
| 62 } | |
| 63 | |
| 64 bool InputStreamImpl::Skip(int64_t n, int64_t* bytes_skipped) { | |
| 65 JNIEnv* env = AttachCurrentThread(); | |
| 66 int bytes = Java_InputStreamUtil_skip(env, jobject_, n); | |
| 67 if (bytes < 0) | |
| 68 return false; | |
| 69 if (bytes > n) | |
| 70 return false; | |
| 71 *bytes_skipped = bytes; | |
| 72 return true; | |
| 73 } | |
| 74 | |
| 75 bool InputStreamImpl::Read(net::IOBuffer* dest, int length, int* bytes_read) { | |
| 76 JNIEnv* env = AttachCurrentThread(); | |
| 77 if (!buffer_.obj()) { | |
| 78 // Allocate transfer buffer. | |
| 79 base::android::ScopedJavaLocalRef<jbyteArray> temp( | |
| 80 env, env->NewByteArray(kBufferSize)); | |
| 81 buffer_.Reset(temp); | |
| 82 if (ClearException(env)) | |
| 83 return false; | |
| 84 } | |
| 85 | |
| 86 int remaining_length = length; | |
| 87 char* dest_write_ptr = dest->data(); | |
| 88 *bytes_read = 0; | |
| 89 | |
| 90 while (remaining_length > 0) { | |
| 91 const int max_transfer_length = std::min(remaining_length, kBufferSize); | |
| 92 const int transfer_length = Java_InputStreamUtil_read( | |
| 93 env, jobject_, buffer_, 0, max_transfer_length); | |
| 94 if (transfer_length == kExceptionThrownStatusCode) | |
| 95 return false; | |
| 96 | |
| 97 if (transfer_length < 0) // EOF | |
| 98 break; | |
| 99 | |
| 100 // Note: it is possible, yet unlikely, that the Java InputStream returns | |
| 101 // a transfer_length == 0 from time to time. In such cases we just continue | |
| 102 // the read until we get either valid data or reach EOF. | |
| 103 if (transfer_length == 0) | |
| 104 continue; | |
| 105 | |
| 106 DCHECK_GE(max_transfer_length, transfer_length); | |
| 107 DCHECK_GE(env->GetArrayLength(buffer_.obj()), transfer_length); | |
| 108 | |
| 109 // This check is to prevent a malicious InputStream implementation from | |
| 110 // overrunning the |dest| buffer. | |
| 111 if (transfer_length > max_transfer_length) | |
| 112 return false; | |
| 113 | |
| 114 // Copy the data over to the provided C++ IOBuffer. | |
| 115 DCHECK_GE(remaining_length, transfer_length); | |
| 116 env->GetByteArrayRegion(buffer_.obj(), 0, transfer_length, | |
| 117 reinterpret_cast<jbyte*>(dest_write_ptr)); | |
| 118 if (ClearException(env)) | |
| 119 return false; | |
| 120 | |
| 121 remaining_length -= transfer_length; | |
| 122 dest_write_ptr += transfer_length; | |
| 123 } | |
| 124 // bytes_read can be strictly less than the req. length if EOF is encountered. | |
| 125 DCHECK_GE(remaining_length, 0); | |
| 126 DCHECK_LE(remaining_length, length); | |
| 127 *bytes_read = length - remaining_length; | |
| 128 return true; | |
| 129 } | |
| 130 | |
| 131 } // namespace android_webview | |
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Issue 2863233002:
[WebView] Move files from native to browser (Closed)
