108 lines
2.4 KiB
C++
108 lines
2.4 KiB
C++
#ifndef __HASH_H
|
|
#define __HASH_H
|
|
|
|
#include "types.hh"
|
|
#include "serialise.hh"
|
|
|
|
|
|
namespace nix {
|
|
|
|
|
|
typedef enum { htUnknown, htMD5, htSHA1, htSHA256 } HashType;
|
|
|
|
|
|
const int md5HashSize = 16;
|
|
const int sha1HashSize = 20;
|
|
const int sha256HashSize = 32;
|
|
|
|
extern const string base32Chars;
|
|
|
|
|
|
struct Hash
|
|
{
|
|
static const unsigned int maxHashSize = 32;
|
|
unsigned int hashSize;
|
|
unsigned char hash[maxHashSize];
|
|
|
|
HashType type;
|
|
|
|
/* Create an unusable hash object. */
|
|
Hash();
|
|
|
|
/* Create a zero-filled hash object. */
|
|
Hash(HashType type);
|
|
|
|
/* Check whether two hash are equal. */
|
|
bool operator == (const Hash & h2) const;
|
|
|
|
/* Check whether two hash are not equal. */
|
|
bool operator != (const Hash & h2) const;
|
|
|
|
/* For sorting. */
|
|
bool operator < (const Hash & h) const;
|
|
|
|
};
|
|
|
|
|
|
/* Convert a hash to a hexadecimal representation. */
|
|
string printHash(const Hash & hash);
|
|
|
|
/* Parse a hexadecimal representation of a hash code. */
|
|
Hash parseHash(HashType ht, const string & s);
|
|
|
|
/* Returns the length of a base-32 hash representation. */
|
|
unsigned int hashLength32(const Hash & hash);
|
|
|
|
/* Convert a hash to a base-32 representation. */
|
|
string printHash32(const Hash & hash);
|
|
|
|
/* Parse a base-32 representation of a hash code. */
|
|
Hash parseHash32(HashType ht, const string & s);
|
|
|
|
/* Verify that the given string is a valid hash code. */
|
|
bool isHash(const string & s);
|
|
|
|
/* Compute the hash of the given string. */
|
|
Hash hashString(HashType ht, const string & s);
|
|
|
|
/* Compute the hash of the given file. */
|
|
Hash hashFile(HashType ht, const Path & path);
|
|
|
|
/* Compute the hash of the given path. The hash is defined as
|
|
(essentially) hashString(ht, dumpPath(path)). */
|
|
struct PathFilter;
|
|
extern PathFilter defaultPathFilter;
|
|
Hash hashPath(HashType ht, const Path & path,
|
|
PathFilter & filter = defaultPathFilter);
|
|
|
|
/* Compress a hash to the specified number of bytes by cyclically
|
|
XORing bytes together. */
|
|
Hash compressHash(const Hash & hash, unsigned int newSize);
|
|
|
|
/* Parse a string representing a hash type. */
|
|
HashType parseHashType(const string & s);
|
|
|
|
/* And the reverse. */
|
|
string printHashType(HashType ht);
|
|
|
|
|
|
union Ctx;
|
|
|
|
class HashSink : public Sink
|
|
{
|
|
private:
|
|
HashType ht;
|
|
Ctx * ctx;
|
|
|
|
public:
|
|
HashSink(HashType ht);
|
|
~HashSink();
|
|
virtual void operator () (const unsigned char * data, unsigned int len);
|
|
Hash finish();
|
|
};
|
|
|
|
|
|
}
|
|
|
|
|
|
#endif /* !__HASH_H */
|