1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
/* ######################################################################
Hashes - Simple wrapper around the hash functions
This is just used to make building the methods simpler, this is the
only interface required..
##################################################################### */
/*}}}*/
#ifndef APTPKG_HASHES_H
#define APTPKG_HASHES_H
#include <apt-pkg/macros.h>
#include <cstring>
#include <string>
#include <vector>
class FileFd;
// helper class that contains hash function name
// and hash
class APT_PUBLIC HashString
{
protected:
std::string Type;
std::string Hash;
static const char * _SupportedHashes[10];
// internal helper
std::string GetHashForFile(std::string filename) const;
public:
HashString(std::string Type, std::string Hash);
explicit HashString(std::string StringedHashString); // init from str as "type:hash"
HashString();
// get hash type used
std::string HashType() const { return Type; };
std::string HashValue() const { return Hash; };
// verify the given filename against the currently loaded hash
bool VerifyFile(std::string filename) const;
// generate a hash string from the given filename
bool FromFile(std::string filename);
// helper
std::string toStr() const; // convert to str as "type:hash"
bool empty() const;
bool usable() const;
bool operator==(HashString const &other) const;
bool operator!=(HashString const &other) const;
// return the list of hashes we support
static APT_PURE const char** SupportedHashes();
};
class APT_PUBLIC HashStringList
{
public:
/** find best hash if no specific one is requested
*
* @param type of the checksum to return, can be \b NULL
* @return If type is \b NULL (or the empty string) it will
* return the 'best' hash; otherwise the hash which was
* specifically requested. If no hash is found \b NULL will be returned.
*/
HashString const * find(char const * const type) const;
HashString const * find(std::string const &type) const { return find(type.c_str()); }
/** finds the filesize hash and returns it as number
*
* @return beware: if the size isn't known we return \b 0 here,
* just like we would do for an empty file. If that is a problem
* for you have to get the size manually out of the list.
*/
unsigned long long FileSize() const;
/** sets the filesize hash
*
* @param Size of the file
* @return @see #push_back
*/
bool FileSize(unsigned long long const Size);
/** check if the given hash type is supported
*
* @param type to check
* @return true if supported, otherwise false
*/
static APT_PURE bool supported(char const * const type);
/** add the given #HashString to the list
*
* @param hashString to add
* @return true if the hash is added because it is supported and
* not already a different hash of the same type included, otherwise false
*/
bool push_back(const HashString &hashString);
/** @return size of the list of HashStrings */
size_t size() const { return list.size(); }
/** verify file against all hashes in the list
*
* @param filename to verify
* @return true if the file matches the hashsum, otherwise false
*/
bool VerifyFile(std::string filename) const;
/** is the list empty ?
*
* @return \b true if the list is empty, otherwise \b false
*/
bool empty() const { return list.empty(); }
/** has the list at least one good entry
*
* similar to #empty, but handles forced hashes.
*
* @return if no hash is forced, same result as #empty,
* if one is forced \b true if this has is available, \b false otherwise
*/
bool usable() const;
typedef std::vector<HashString>::const_iterator const_iterator;
/** iterator to the first element */
const_iterator begin() const { return list.begin(); }
/** iterator to the end element */
const_iterator end() const { return list.end(); }
/** start fresh with a clear list */
void clear() { list.clear(); }
/** compare two HashStringList for similarity.
*
* Two lists are similar if at least one hashtype is in both lists
* and the hashsum matches. All hashes are checked by default,
* if one doesn't match false is returned regardless of how many
* matched before. If a hash is forced, only this hash is compared,
* all others are ignored.
*/
bool operator==(HashStringList const &other) const;
bool operator!=(HashStringList const &other) const;
HashStringList() {}
// simplifying API-compatibility constructors
explicit HashStringList(std::string const &hash) {
if (hash.empty() == false)
list.push_back(HashString(hash));
}
explicit HashStringList(char const * const hash) {
if (hash != NULL && hash[0] != '\0')
list.push_back(HashString(hash));
}
private:
std::vector<HashString> list;
};
class PrivateHashes;
class APT_PUBLIC Hashes
{
PrivateHashes * const d;
public:
static const int UntilEOF = 0;
bool Add(const unsigned char * const Data, unsigned long long const Size) APT_NONNULL(2);
inline bool Add(const char * const Data) APT_NONNULL(2)
{return Add(reinterpret_cast<unsigned char const *>(Data),strlen(Data));};
inline bool Add(const char *const Data, unsigned long long const Size) APT_NONNULL(2)
{
return Add(reinterpret_cast<unsigned char const *>(Data), Size);
};
inline bool Add(const unsigned char * const Beg,const unsigned char * const End) APT_NONNULL(2,3)
{return Add(Beg,End-Beg);};
enum SupportedHashes { MD5SUM = (1 << 0), SHA1SUM = (1 << 1), SHA256SUM = (1 << 2),
SHA512SUM = (1 << 3) };
bool AddFD(int const Fd,unsigned long long Size = 0);
bool AddFD(FileFd &Fd,unsigned long long Size = 0);
HashStringList GetHashStringList();
/** Get a specific hash. It is an error to use a hash that was not hashes */
HashString GetHashString(SupportedHashes hash);
/** create a Hashes object to calculate all supported hashes
*
* If ALL is too much, you can limit which Hashes are calculated
* with the following other constructors which mention explicitly
* which hashes to generate. */
Hashes();
/** @param Hashes bitflag composed of #SupportedHashes */
explicit Hashes(unsigned int const Hashes);
/** @param Hashes is a list of hashes */
explicit Hashes(HashStringList const &Hashes);
virtual ~Hashes();
};
#endif
|
