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-rw-r--r--jni_jpegstream/src/inputstream_wrapper.cpp69
1 files changed, 69 insertions, 0 deletions
diff --git a/jni_jpegstream/src/inputstream_wrapper.cpp b/jni_jpegstream/src/inputstream_wrapper.cpp
new file mode 100644
index 0000000..98721b0
--- /dev/null
+++ b/jni_jpegstream/src/inputstream_wrapper.cpp
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "inputstream_wrapper.h"
+#include "error_codes.h"
+
+jmethodID InputStreamWrapper::sReadID = NULL;
+jmethodID InputStreamWrapper::sSkipID = NULL;
+
+int32_t InputStreamWrapper::read(int32_t length, int32_t offset) {
+ if (offset < 0 || length < 0 || (offset + length) > getBufferSize()) {
+ return J_ERROR_BAD_ARGS;
+ }
+ int32_t bytesRead = 0;
+ mEnv->ReleaseByteArrayElements(mByteArray, mBytes, JNI_COMMIT);
+ mBytes = NULL;
+ if (mEnv->ExceptionCheck()) {
+ return J_EXCEPTION;
+ }
+ bytesRead = static_cast<int32_t>(mEnv->CallIntMethod(mStream, sReadID,
+ mByteArray, offset, length));
+ if (mEnv->ExceptionCheck()) {
+ return J_EXCEPTION;
+ }
+ mBytes = mEnv->GetByteArrayElements(mByteArray, NULL);
+ if (mBytes == NULL || mEnv->ExceptionCheck()) {
+ return J_EXCEPTION;
+ }
+ if (bytesRead == END_OF_STREAM) {
+ return J_DONE;
+ }
+ return bytesRead;
+}
+
+int64_t InputStreamWrapper::skip(int64_t count) {
+ int64_t bytesSkipped = 0;
+ bytesSkipped = static_cast<int64_t>(mEnv->CallLongMethod(mStream, sSkipID,
+ static_cast<jlong>(count)));
+ if (mEnv->ExceptionCheck() || bytesSkipped < 0) {
+ return J_EXCEPTION;
+ }
+ return bytesSkipped;
+}
+
+// Acts like a read call that returns the End Of Image marker for a JPEG file.
+int32_t InputStreamWrapper::forceReadEOI() {
+ mBytes[0] = (jbyte) 0xFF;
+ mBytes[1] = (jbyte) 0xD9;
+ return 2;
+}
+
+void InputStreamWrapper::setReadSkipMethodIDs(jmethodID readID,
+ jmethodID skipID) {
+ sReadID = readID;
+ sSkipID = skipID;
+}