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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef _APPLYPATCH_IMGDIFF_H
     18 #define _APPLYPATCH_IMGDIFF_H
     19 
     20 #include <stddef.h>
     21 
     22 // Image patch chunk types
     23 #define CHUNK_NORMAL 0
     24 #define CHUNK_GZIP 1     // version 1 only
     25 #define CHUNK_DEFLATE 2  // version 2 only
     26 #define CHUNK_RAW 3      // version 2 only
     27 
     28 // The gzip header size is actually variable, but we currently don't
     29 // support gzipped data with any of the optional fields, so for now it
     30 // will always be ten bytes.  See RFC 1952 for the definition of the
     31 // gzip format.
     32 static constexpr size_t GZIP_HEADER_LEN = 10;
     33 
     34 // The gzip footer size really is fixed.
     35 static constexpr size_t GZIP_FOOTER_LEN = 8;
     36 
     37 int imgdiff(int argc, const char** argv);
     38 
     39 #endif  // _APPLYPATCH_IMGDIFF_H
     40