The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | #include "CreateJavaOutputStreamAdaptor.h" |
| 2 | |
| 3 | #define RETURN_NULL_IF_NULL(value) \ |
| 4 | do { if (!(value)) { SkASSERT(0); return NULL; } } while (false) |
| 5 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 6 | static jmethodID gInputStream_resetMethodID; |
Joseph Wen | f1f48bc | 2010-07-19 16:59:51 +0800 | [diff] [blame] | 7 | static jmethodID gInputStream_markMethodID; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 8 | static jmethodID gInputStream_availableMethodID; |
| 9 | static jmethodID gInputStream_readMethodID; |
| 10 | static jmethodID gInputStream_skipMethodID; |
| 11 | |
| 12 | class JavaInputStreamAdaptor : public SkStream { |
| 13 | public: |
| 14 | JavaInputStreamAdaptor(JNIEnv* env, jobject js, jbyteArray ar) |
| 15 | : fEnv(env), fJavaInputStream(js), fJavaByteArray(ar) { |
| 16 | SkASSERT(ar); |
| 17 | fCapacity = env->GetArrayLength(ar); |
| 18 | SkASSERT(fCapacity > 0); |
| 19 | fBytesRead = 0; |
| 20 | } |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 21 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 22 | virtual bool rewind() { |
| 23 | JNIEnv* env = fEnv; |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 24 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 25 | fBytesRead = 0; |
| 26 | |
| 27 | env->CallVoidMethod(fJavaInputStream, gInputStream_resetMethodID); |
| 28 | if (env->ExceptionCheck()) { |
| 29 | env->ExceptionDescribe(); |
| 30 | env->ExceptionClear(); |
| 31 | SkDebugf("------- reset threw an exception\n"); |
| 32 | return false; |
| 33 | } |
| 34 | return true; |
| 35 | } |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 36 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 37 | size_t doRead(void* buffer, size_t size) { |
| 38 | JNIEnv* env = fEnv; |
| 39 | size_t bytesRead = 0; |
| 40 | // read the bytes |
| 41 | do { |
| 42 | size_t requested = size; |
| 43 | if (requested > fCapacity) |
| 44 | requested = fCapacity; |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 45 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 46 | jint n = env->CallIntMethod(fJavaInputStream, |
| 47 | gInputStream_readMethodID, fJavaByteArray, 0, requested); |
| 48 | if (env->ExceptionCheck()) { |
| 49 | env->ExceptionDescribe(); |
| 50 | env->ExceptionClear(); |
| 51 | SkDebugf("---- read threw an exception\n"); |
| 52 | return 0; |
| 53 | } |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 54 | |
Gilles Debunne | 8cd4857 | 2010-07-15 18:06:36 -0700 | [diff] [blame] | 55 | if (n < 0) { // n == 0 should not be possible, see InputStream read() specifications. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 56 | break; // eof |
| 57 | } |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 58 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 59 | env->GetByteArrayRegion(fJavaByteArray, 0, n, |
| 60 | reinterpret_cast<jbyte*>(buffer)); |
| 61 | if (env->ExceptionCheck()) { |
| 62 | env->ExceptionDescribe(); |
| 63 | env->ExceptionClear(); |
| 64 | SkDebugf("---- read:GetByteArrayRegion threw an exception\n"); |
| 65 | return 0; |
| 66 | } |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 67 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 68 | buffer = (void*)((char*)buffer + n); |
| 69 | bytesRead += n; |
| 70 | size -= n; |
| 71 | fBytesRead += n; |
| 72 | } while (size != 0); |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 73 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 74 | return bytesRead; |
| 75 | } |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 76 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 77 | size_t doSkip(size_t size) { |
| 78 | JNIEnv* env = fEnv; |
Gilles Debunne | 8cd4857 | 2010-07-15 18:06:36 -0700 | [diff] [blame] | 79 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 80 | jlong skipped = env->CallLongMethod(fJavaInputStream, |
| 81 | gInputStream_skipMethodID, (jlong)size); |
| 82 | if (env->ExceptionCheck()) { |
| 83 | env->ExceptionDescribe(); |
| 84 | env->ExceptionClear(); |
Gilles Debunne | 8cd4857 | 2010-07-15 18:06:36 -0700 | [diff] [blame] | 85 | SkDebugf("------- skip threw an exception\n"); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 86 | return 0; |
| 87 | } |
| 88 | if (skipped < 0) { |
| 89 | skipped = 0; |
| 90 | } |
Gilles Debunne | 8cd4857 | 2010-07-15 18:06:36 -0700 | [diff] [blame] | 91 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 92 | return (size_t)skipped; |
| 93 | } |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 94 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 95 | size_t doSize() { |
| 96 | JNIEnv* env = fEnv; |
| 97 | jint avail = env->CallIntMethod(fJavaInputStream, |
| 98 | gInputStream_availableMethodID); |
| 99 | if (env->ExceptionCheck()) { |
| 100 | env->ExceptionDescribe(); |
| 101 | env->ExceptionClear(); |
| 102 | SkDebugf("------- available threw an exception\n"); |
| 103 | avail = 0; |
| 104 | } |
| 105 | return avail; |
| 106 | } |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 107 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 108 | virtual size_t read(void* buffer, size_t size) { |
| 109 | JNIEnv* env = fEnv; |
| 110 | if (NULL == buffer) { |
| 111 | if (0 == size) { |
| 112 | return this->doSize(); |
| 113 | } else { |
| 114 | /* InputStream.skip(n) can return <=0 but still not be at EOF |
| 115 | If we see that value, we need to call read(), which will |
| 116 | block if waiting for more data, or return -1 at EOF |
| 117 | */ |
| 118 | size_t amountSkipped = 0; |
| 119 | do { |
Gilles Debunne | 8cd4857 | 2010-07-15 18:06:36 -0700 | [diff] [blame] | 120 | size_t amount = this->doSkip(size - amountSkipped); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 121 | if (0 == amount) { |
| 122 | char tmp; |
| 123 | amount = this->doRead(&tmp, 1); |
| 124 | if (0 == amount) { |
| 125 | // if read returned 0, we're at EOF |
| 126 | break; |
| 127 | } |
| 128 | } |
| 129 | amountSkipped += amount; |
| 130 | } while (amountSkipped < size); |
| 131 | return amountSkipped; |
| 132 | } |
| 133 | } |
| 134 | return this->doRead(buffer, size); |
| 135 | } |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 136 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 137 | private: |
| 138 | JNIEnv* fEnv; |
| 139 | jobject fJavaInputStream; // the caller owns this object |
| 140 | jbyteArray fJavaByteArray; // the caller owns this object |
| 141 | size_t fCapacity; |
| 142 | size_t fBytesRead; |
| 143 | }; |
| 144 | |
| 145 | SkStream* CreateJavaInputStreamAdaptor(JNIEnv* env, jobject stream, |
Joseph Wen | f1f48bc | 2010-07-19 16:59:51 +0800 | [diff] [blame] | 146 | jbyteArray storage, int markSize) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 147 | static bool gInited; |
| 148 | |
| 149 | if (!gInited) { |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 150 | jclass inputStream_Clazz = env->FindClass("java/io/InputStream"); |
| 151 | RETURN_NULL_IF_NULL(inputStream_Clazz); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 152 | |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 153 | gInputStream_resetMethodID = env->GetMethodID(inputStream_Clazz, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 154 | "reset", "()V"); |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 155 | gInputStream_markMethodID = env->GetMethodID(inputStream_Clazz, |
Joseph Wen | f1f48bc | 2010-07-19 16:59:51 +0800 | [diff] [blame] | 156 | "mark", "(I)V"); |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 157 | gInputStream_availableMethodID = env->GetMethodID(inputStream_Clazz, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 158 | "available", "()I"); |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 159 | gInputStream_readMethodID = env->GetMethodID(inputStream_Clazz, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 160 | "read", "([BII)I"); |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 161 | gInputStream_skipMethodID = env->GetMethodID(inputStream_Clazz, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 162 | "skip", "(J)J"); |
| 163 | |
| 164 | RETURN_NULL_IF_NULL(gInputStream_resetMethodID); |
Joseph Wen | f1f48bc | 2010-07-19 16:59:51 +0800 | [diff] [blame] | 165 | RETURN_NULL_IF_NULL(gInputStream_markMethodID); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 166 | RETURN_NULL_IF_NULL(gInputStream_availableMethodID); |
| 167 | RETURN_NULL_IF_NULL(gInputStream_availableMethodID); |
| 168 | RETURN_NULL_IF_NULL(gInputStream_skipMethodID); |
| 169 | |
| 170 | gInited = true; |
| 171 | } |
| 172 | |
Joseph Wen | f1f48bc | 2010-07-19 16:59:51 +0800 | [diff] [blame] | 173 | if (markSize) { |
| 174 | env->CallVoidMethod(stream, gInputStream_markMethodID, markSize); |
| 175 | } |
| 176 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 177 | return new JavaInputStreamAdaptor(env, stream, storage); |
| 178 | } |
| 179 | |
| 180 | /////////////////////////////////////////////////////////////////////////////// |
| 181 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 182 | static jmethodID gOutputStream_writeMethodID; |
| 183 | static jmethodID gOutputStream_flushMethodID; |
| 184 | |
| 185 | class SkJavaOutputStream : public SkWStream { |
| 186 | public: |
| 187 | SkJavaOutputStream(JNIEnv* env, jobject stream, jbyteArray storage) |
| 188 | : fEnv(env), fJavaOutputStream(stream), fJavaByteArray(storage) { |
| 189 | fCapacity = env->GetArrayLength(storage); |
| 190 | } |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 191 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 192 | virtual bool write(const void* buffer, size_t size) { |
| 193 | JNIEnv* env = fEnv; |
| 194 | jbyteArray storage = fJavaByteArray; |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 195 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 196 | while (size > 0) { |
| 197 | size_t requested = size; |
| 198 | if (requested > fCapacity) { |
| 199 | requested = fCapacity; |
| 200 | } |
| 201 | |
| 202 | env->SetByteArrayRegion(storage, 0, requested, |
| 203 | reinterpret_cast<const jbyte*>(buffer)); |
| 204 | if (env->ExceptionCheck()) { |
| 205 | env->ExceptionDescribe(); |
| 206 | env->ExceptionClear(); |
| 207 | SkDebugf("--- write:SetByteArrayElements threw an exception\n"); |
| 208 | return false; |
| 209 | } |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 210 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 211 | fEnv->CallVoidMethod(fJavaOutputStream, gOutputStream_writeMethodID, |
| 212 | storage, 0, requested); |
| 213 | if (env->ExceptionCheck()) { |
| 214 | env->ExceptionDescribe(); |
| 215 | env->ExceptionClear(); |
| 216 | SkDebugf("------- write threw an exception\n"); |
| 217 | return false; |
| 218 | } |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 219 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 220 | buffer = (void*)((char*)buffer + requested); |
| 221 | size -= requested; |
| 222 | } |
| 223 | return true; |
| 224 | } |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 225 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 226 | virtual void flush() { |
| 227 | fEnv->CallVoidMethod(fJavaOutputStream, gOutputStream_flushMethodID); |
| 228 | } |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 229 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 230 | private: |
| 231 | JNIEnv* fEnv; |
| 232 | jobject fJavaOutputStream; // the caller owns this object |
| 233 | jbyteArray fJavaByteArray; // the caller owns this object |
| 234 | size_t fCapacity; |
| 235 | }; |
| 236 | |
| 237 | SkWStream* CreateJavaOutputStreamAdaptor(JNIEnv* env, jobject stream, |
| 238 | jbyteArray storage) { |
| 239 | static bool gInited; |
| 240 | |
| 241 | if (!gInited) { |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 242 | jclass outputStream_Clazz = env->FindClass("java/io/OutputStream"); |
| 243 | RETURN_NULL_IF_NULL(outputStream_Clazz); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 244 | |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 245 | gOutputStream_writeMethodID = env->GetMethodID(outputStream_Clazz, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 246 | "write", "([BII)V"); |
| 247 | RETURN_NULL_IF_NULL(gOutputStream_writeMethodID); |
Elliott Hughes | dd66bcb | 2011-04-12 11:28:59 -0700 | [diff] [blame] | 248 | gOutputStream_flushMethodID = env->GetMethodID(outputStream_Clazz, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 249 | "flush", "()V"); |
| 250 | RETURN_NULL_IF_NULL(gOutputStream_flushMethodID); |
| 251 | |
| 252 | gInited = true; |
| 253 | } |
| 254 | |
| 255 | return new SkJavaOutputStream(env, stream, storage); |
| 256 | } |