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// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
// $Id: hashes.h,v 1.2 2001/03/11 05:30:20 jgg Exp $
/* ######################################################################
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/md5.h>
#include <apt-pkg/sha1.h>
#include <apt-pkg/sha2.h>
#include <apt-pkg/macros.h>
#include <cstring>
#include <string>
#ifndef APT_8_CLEANER_HEADERS
using std::min;
using std::vector;
#endif
#ifndef APT_10_CLEANER_HEADERS
#include <apt-pkg/fileutl.h>
#include <algorithm>
#include <vector>
#endif
class FileFd;
// helper class that contains hash function name
// and hash
class 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);
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 operator==(HashString const &other) const;
bool operator!=(HashString const &other) const;
// return the list of hashes we support
static APT_CONST const char** SupportedHashes();
};
class 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()); }
/** 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(); }
/** take the 'best' hash and verify file with it
*
* @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(); }
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, if one doesn't
* match false is returned regardless of how many matched before.
*/
bool operator==(HashStringList const &other) const;
bool operator!=(HashStringList const &other) const;
HashStringList() {}
// simplifying API-compatibility constructors
HashStringList(std::string const &hash) {
if (hash.empty() == false)
list.push_back(HashString(hash));
}
HashStringList(char const * const hash) {
if (hash != NULL && hash[0] != '\0')
list.push_back(HashString(hash));
}
private:
std::vector<HashString> list;
};
class Hashes
{
public:
MD5Summation MD5;
SHA1Summation SHA1;
SHA256Summation SHA256;
SHA512Summation SHA512;
static const int UntilEOF = 0;
inline bool Add(const unsigned char *Data,unsigned long long Size)
{
return MD5.Add(Data,Size) && SHA1.Add(Data,Size) && SHA256.Add(Data,Size) && SHA512.Add(Data,Size);
};
inline bool Add(const char *Data) {return Add((unsigned char const *)Data,strlen(Data));};
inline bool AddFD(int const Fd,unsigned long long Size = 0)
{ return AddFD(Fd, Size, true, true, true, true); };
bool AddFD(int const Fd, unsigned long long Size, bool const addMD5,
bool const addSHA1, bool const addSHA256, bool const addSHA512);
inline bool AddFD(FileFd &Fd,unsigned long long Size = 0)
{ return AddFD(Fd, Size, true, true, true, true); };
bool AddFD(FileFd &Fd, unsigned long long Size, bool const addMD5,
bool const addSHA1, bool const addSHA256, bool const addSHA512);
inline bool Add(const unsigned char *Beg,const unsigned char *End)
{return Add(Beg,End-Beg);};
};
#endif
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