80 lines
2.6 KiB
C
80 lines
2.6 KiB
C
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#if !defined(AVB_INSIDE_LIBAVB_AB_H) && !defined(AVB_COMPILATION)
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#error \
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"Never include this file directly, include libavb_ab/libavb_ab.h instead."
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#endif
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#ifndef AVB_AB_OPS_H_
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#define AVB_AB_OPS_H_
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#include <libavb/libavb.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct AvbABOps;
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typedef struct AvbABOps AvbABOps;
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struct AvbABData;
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/* High-level operations/functions/methods for A/B that are platform
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* dependent.
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*/
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struct AvbABOps {
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/* Operations from libavb. */
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AvbOps* ops;
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/* Reads A/B metadata from persistent storage. Returned data is
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* properly byteswapped. Returns AVB_IO_RESULT_OK on success, error
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* code otherwise.
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*
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* If the data read is invalid (e.g. wrong magic or CRC checksum
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* failure), the metadata shoule be reset using avb_ab_data_init()
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* and then written to persistent storage.
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*
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* Implementations will typically want to use avb_ab_data_read()
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* here to use the 'misc' partition for persistent storage.
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*/
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AvbIOResult (*read_ab_metadata)(AvbABOps* ab_ops, struct AvbABData* data);
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/* Writes A/B metadata to persistent storage. This will byteswap and
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* update the CRC as needed. Returns AVB_IO_RESULT_OK on success,
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* error code otherwise.
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*
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* Implementations will typically want to use avb_ab_data_write()
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* here to use the 'misc' partition for persistent storage.
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*/
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AvbIOResult (*write_ab_metadata)(AvbABOps* ab_ops,
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const struct AvbABData* data);
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};
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#ifdef __cplusplus
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}
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#endif
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#endif /* AVB_AB_OPS_H_ */
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