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