1 files changed, 128 insertions, 0 deletions
diff --git a/framesequence/jni/Stream.cpp b/framesequence/jni/Stream.cpp
new file mode 100644
index 0000000..b2e0c39
--- /dev/null
+++ b/framesequence/jni/Stream.cpp
@@ -0,0 +1,128 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "Stream"
+
+#include "Stream.h"
+
+#include <string.h>
+
+#include "JNIHelpers.h"
+#include "utils/log.h"
+#include "utils/math.h"
+
+static struct {
+    jmethodID read;
+    jmethodID reset;
+} gInputStreamClassInfo;
+
+Stream::Stream()
+    : mPeekBuffer(0)
+    , mPeekSize(0)
+    , mPeekOffset(0) {
+}
+
+Stream::~Stream() {
+    delete mPeekBuffer;
+}
+
+size_t Stream::peek(void* buffer, size_t size) {
+    size_t peek_remaining = mPeekSize - mPeekOffset;
+    if (size > peek_remaining) {
+        char* old_peek = mPeekBuffer;
+        mPeekBuffer = new char[size];
+        if (old_peek) {
+            memcpy(mPeekBuffer, old_peek + mPeekOffset, peek_remaining);
+            delete old_peek;
+        }
+        size_t read = doRead(mPeekBuffer + mPeekOffset, size - peek_remaining);
+        mPeekOffset = 0;
+        mPeekSize = peek_remaining + read;
+    }
+    size = min(size, mPeekSize - mPeekOffset);
+    memcpy(buffer, mPeekBuffer + mPeekOffset, size);
+    return size;
+}
+
+size_t Stream::read(void* buffer, size_t size) {
+    size_t bytes_read = 0;
+    size_t peek_remaining = mPeekSize - mPeekOffset;
+    if (peek_remaining) {
+        bytes_read = min(size, peek_remaining);
+        memcpy(buffer, mPeekBuffer + mPeekOffset, bytes_read);
+        mPeekOffset += bytes_read;
+        if (mPeekOffset == mPeekSize) {
+            delete mPeekBuffer;
+            mPeekBuffer = 0;
+            mPeekOffset = 0;
+            mPeekSize = 0;
+        }
+        size -= bytes_read;
+        buffer = ((char*) buffer) + bytes_read;
+    }
+    if (size) {
+        bytes_read += doRead(buffer, size);
+    }
+    return bytes_read;
+}
+
+size_t MemoryStream::doRead(void* buffer, size_t size) {
+    size = min(size, mRemaining);
+    memcpy(buffer, mBuffer, size);
+    mBuffer += size;
+    mRemaining -= size;
+    return size;
+}
+
+size_t FileStream::doRead(void* buffer, size_t size) {
+    return fread(buffer, 1, size, mFd);
+}
+
+size_t JavaInputStream::doRead(void* dstBuffer, size_t size) {
+    size_t totalBytesRead = 0;
+
+    do {
+        size_t requested = min(size, mByteArrayLength);
+
+        jint bytesRead = mEnv->CallIntMethod(mInputStream,
+                gInputStreamClassInfo.read, mByteArray, 0, requested);
+        if (mEnv->ExceptionCheck() || bytesRead < 0) {
+            return 0;
+        }
+
+        mEnv->GetByteArrayRegion(mByteArray, 0, bytesRead, (jbyte*)dstBuffer);
+        dstBuffer = (char*)dstBuffer + bytesRead;
+        totalBytesRead += bytesRead;
+        size -= bytesRead;
+    } while (size > 0);
+
+    return totalBytesRead;
+}
+
+jint JavaStream_OnLoad(JNIEnv* env) {
+    // Skip the verbose logging on error for these, as they won't be subject
+    // to obfuscators or similar and are thus unlikely to ever fail
+    jclass inputStreamClazz = env->FindClass("java/io/InputStream");
+    if (!inputStreamClazz) {
+        return -1;
+    }
+    gInputStreamClassInfo.read = env->GetMethodID(inputStreamClazz, "read", "([BII)I");
+    gInputStreamClassInfo.reset = env->GetMethodID(inputStreamClazz, "reset", "()V");
+    if (!gInputStreamClassInfo.read || !gInputStreamClassInfo.reset) {
+        return -1;
+    }
+    return 0;
+}