//checksum_plugin.h
//  checksum plugin type
/*
 The MIT License (MIT)
 Copyright (c) 2018-2019 HouSisong
 
 Permission is hereby granted, free of charge, to any person
 obtaining a copy of this software and associated documentation
 files (the "Software"), to deal in the Software without
 restriction, including without limitation the rights to use,
 copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the
 Software is furnished to do so, subject to the following
 conditions:
 
 The above copyright notice and this permission notice shall be
 included in all copies of the Software.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 OTHER DEALINGS IN THE SOFTWARE.
 */
#ifndef HPatch_checksum_plugin_h
#define HPatch_checksum_plugin_h
#include "patch_types.h"
#ifdef __cplusplus
extern "C" {
#endif
    
    typedef void*  hpatch_checksumHandle;
    typedef struct hpatch_TChecksum{
        //return type tag; strlen(result)<=hpatch_kMaxPluginTypeLength; (Note:result lifetime)
        const char*   (*checksumType)(void); //ascii cstring,cannot contain '&'
        hpatch_size_t (*checksumByteSize)(void); //result<=hpatch_kStreamCacheSize
        hpatch_checksumHandle (*open)(struct hpatch_TChecksum* plugin);
        void                 (*close)(struct hpatch_TChecksum* plugin,hpatch_checksumHandle handle);
        void                 (*begin)(hpatch_checksumHandle handle);
        void                (*append)(hpatch_checksumHandle handle,
                                      const unsigned char* part_data,const unsigned char* part_data_end);
        void                   (*end)(hpatch_checksumHandle handle,
                                      unsigned char* checksum,unsigned char* checksum_end);
    } hpatch_TChecksum;
    
#ifdef __cplusplus
}
#endif
#endif