Merge "DNG: Update TiffWriter to handle thumbnails and SubIfds."

         * 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.  If an error has occurred, the value pointed

         * to by the given status_t pointer will be set to a negative error code.

         * 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 size_t read(uint8_t* buf, size_t offset, size_t count, status_t* err);

        virtual ssize_t read(uint8_t* buf, size_t offset, size_t count);

        /**

         * Close the file descriptor to the path given in the constructor.

         * 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.  If an error has occurred, the value pointed

         * to by the given status_t pointer will be set to a negative error code.

         * 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 size_t read(uint8_t* buf, size_t offset, size_t count, status_t* err) = 0;

        virtual ssize_t read(uint8_t* buf, size_t offset, size_t count) = 0;

        /**

         * Skips bytes in the input.

         *

         * Returns the number of bytes skipped, 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 skip(size_t count);

        /**

         * Close the Input.  It is not valid to call open on a previously closed Input.

/*

 * 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_STRIP_SOURCE_H

#define IMG_UTILS_STRIP_SOURCE_H

#include <img_utils/Output.h>

#include <cutils/compiler.h>

#include <utils/Errors.h>

#include <stdint.h>

namespace android {

namespace img_utils {

/**

 * This class acts as a data source for strips set in a TiffIfd.

 */

class ANDROID_API StripSource {

    public:

        virtual ~StripSource();

        /**

         * Write count bytes to the stream.

         *

         * Returns OK on success, or a negative error code.

         */

        virtual status_t writeToStream(Output& stream, uint32_t count) = 0;

        /**

         * Return the source IFD.

         */

        virtual uint32_t getIfd() const = 0;

};

} /*namespace img_utils*/

} /*namespace android*/

#endif /*IMG_UTILS_STRIP_SOURCE_H*/