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/*
* 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.
*/
#ifndef LIBJPEG_HOOK_H_
#define LIBJPEG_HOOK_H_
extern "C" {
#include "jinclude.h"
#include "jpeglib.h"
#include "jerror.h"
}
#include "inputstream_wrapper.h"
#include "outputstream_wrapper.h"
#include <stdint.h>
/**
* DestManager holds the libjpeg destination manager struct and
* a holder with a java OutputStream.
*/
typedef struct {
struct jpeg_destination_mgr mgr;
OutputStreamWrapper *outStream;
} DestManager;
// Initializes the DestManager struct, sets up the jni refs
int32_t MakeDst(j_compress_ptr cinfo, JNIEnv *env, jobject outStream);
/**
* Updates the jni env pointer. This should be called in the beginning of any
* JNI method in jpegstream.cpp before CleanDst or any of the libjpeg functions
* that can trigger a call to an OutputStreamWrapper method.
*/
void UpdateDstEnv(j_compress_ptr cinfo, JNIEnv* env);
// Cleans the jni refs. To wipe the compress object call jpeg_destroy_compress
void CleanDst(j_compress_ptr cinfo);
/**
* SourceManager holds the libjpeg source manager struct and a
* holder with a java InputStream.
*/
typedef struct {
struct jpeg_source_mgr mgr;
boolean start_of_file;
InputStreamWrapper *inStream;
} SourceManager;
// Initializes the SourceManager struct, sets up the jni refs
int32_t MakeSrc(j_decompress_ptr cinfo, JNIEnv *env, jobject inStream);
/**
* Updates the jni env pointer. This should be called in the beginning of any
* JNI method in jpegstream.cpp before CleanSrc or any of the libjpeg functions
* that can trigger a call to an InputStreamWrapper method.
*/
void UpdateSrcEnv(j_decompress_ptr cinfo, JNIEnv* env);
// Cleans the jni refs. To wipe the decompress object, call jpeg_destroy_decompress
void CleanSrc(j_decompress_ptr cinfo);
#endif // LIBJPEG_HOOK_H_
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