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      1 /*
      2  * Copyright (C) 2008 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_H
     18 #define _APPLYPATCH_H
     19 
     20 #include <sys/stat.h>
     21 #include "mincrypt/sha.h"
     22 #include "minelf/Retouch.h"
     23 #include "edify/expr.h"
     24 
     25 typedef struct _Patch {
     26   uint8_t sha1[SHA_DIGEST_SIZE];
     27   const char* patch_filename;
     28 } Patch;
     29 
     30 typedef struct _FileContents {
     31   uint8_t sha1[SHA_DIGEST_SIZE];
     32   unsigned char* data;
     33   ssize_t size;
     34   struct stat st;
     35 } FileContents;
     36 
     37 // When there isn't enough room on the target filesystem to hold the
     38 // patched version of the file, we copy the original here and delete
     39 // it to free up space.  If the expected source file doesn't exist, or
     40 // is corrupted, we look to see if this file contains the bits we want
     41 // and use it as the source instead.
     42 #define CACHE_TEMP_SOURCE "/cache/saved.file"
     43 
     44 typedef ssize_t (*SinkFn)(unsigned char*, ssize_t, void*);
     45 
     46 // applypatch.c
     47 int ShowLicenses();
     48 size_t FreeSpaceForFile(const char* filename);
     49 int CacheSizeCheck(size_t bytes);
     50 int ParseSha1(const char* str, uint8_t* digest);
     51 
     52 int applypatch(const char* source_filename,
     53                const char* target_filename,
     54                const char* target_sha1_str,
     55                size_t target_size,
     56                int num_patches,
     57                char** const patch_sha1_str,
     58                Value** patch_data,
     59                Value* bonus_data);
     60 int applypatch_check(const char* filename,
     61                      int num_patches,
     62                      char** const patch_sha1_str);
     63 
     64 int LoadFileContents(const char* filename, FileContents* file,
     65                      int retouch_flag);
     66 int SaveFileContents(const char* filename, const FileContents* file);
     67 void FreeFileContents(FileContents* file);
     68 int FindMatchingPatch(uint8_t* sha1, char* const * const patch_sha1_str,
     69                       int num_patches);
     70 
     71 // bsdiff.c
     72 void ShowBSDiffLicense();
     73 int ApplyBSDiffPatch(const unsigned char* old_data, ssize_t old_size,
     74                      const Value* patch, ssize_t patch_offset,
     75                      SinkFn sink, void* token, SHA_CTX* ctx);
     76 int ApplyBSDiffPatchMem(const unsigned char* old_data, ssize_t old_size,
     77                         const Value* patch, ssize_t patch_offset,
     78                         unsigned char** new_data, ssize_t* new_size);
     79 
     80 // imgpatch.c
     81 int ApplyImagePatch(const unsigned char* old_data, ssize_t old_size,
     82                     const Value* patch,
     83                     SinkFn sink, void* token, SHA_CTX* ctx,
     84                     const Value* bonus_data);
     85 
     86 // freecache.c
     87 int MakeFreeSpaceOnCache(size_t bytes_needed);
     88 
     89 #endif
     90