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/*
* Copyright 2014 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 IMG_UTILS_FILE_INPUT_H
#define IMG_UTILS_FILE_INPUT_H
#include <img_utils/Input.h>
#include <cutils/compiler.h>
#include <utils/Errors.h>
#include <utils/String8.h>
#include <stdio.h>
#include <stdint.h>
namespace android {
namespace img_utils {
/**
* Utility class for reading from a file.
*/
class ANDROID_API FileInput : public Input {
public:
/**
* Create a file input for the given path.
*/
FileInput(String8 path);
virtual ~FileInput();
/**
* Open a file descriptor to the path given in the constructor.
*
* Returns OK on success, or a negative error code.
*/
virtual status_t open();
/**
* Read bytes from the file into the given buffer. At most, the number
* of bytes given in the count argument will be read. Bytes will be written
* into the given buffer starting at the index given in the offset argument.
*
* Returns the number of bytes read, or NOT_ENOUGH_DATA if at the end of the file. If an
* error has occurred, this will return a negative error code other than NOT_ENOUGH_DATA.
*/
virtual ssize_t read(uint8_t* buf, size_t offset, size_t count);
/**
* Close the file descriptor to the path given in the constructor.
*
* Returns OK on success, or a negative error code.
*/
virtual status_t close();
private:
FILE *mFp;
String8 mPath;
bool mOpen;
};
} /*namespace img_utils*/
} /*namespace android*/
#endif /*IMG_UTILS_INPUT_H*/
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