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Diffstat (limited to 'media/img_utils/include/img_utils/FileInput.h')
-rw-r--r-- | media/img_utils/include/img_utils/FileInput.h | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/media/img_utils/include/img_utils/FileInput.h b/media/img_utils/include/img_utils/FileInput.h new file mode 100644 index 0000000..d3c5ec1 --- /dev/null +++ b/media/img_utils/include/img_utils/FileInput.h @@ -0,0 +1,76 @@ +/* + * 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. If an error has occurred, the value pointed + * to by the given status_t pointer will be set to a negative error code. + */ + virtual size_t read(uint8_t* buf, size_t offset, size_t count, status_t* err); + + /** + * 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*/ |