#pragma once

#include <gcrypt.h>

#include "types.hh"
#include "serialise.hh"


namespace nix {


extern const string base32Chars;

typedef enum {
    htUnknown = 0,
    htMD5 = GCRY_MD_MD5,
    htSHA1 = GCRY_MD_SHA1,
    htSHA256 = GCRY_MD_SHA256,
    htSHA512 = GCRY_MD_SHA512,
    htSHA3_256 = GCRY_MD_SHA3_256,
    htSHA3_512 = GCRY_MD_SHA3_512,
    htBLAKE2s_256 = GCRY_MD_BLAKE2S_256
} HashType;

struct Hash
{
    static const unsigned int maxHashSize = 64;
    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);

/* Print a hash in base-16 if it's MD5, or base-32 otherwise. */
string printHash16or32(const Hash & hash);

/* Parse a base-32 representation of a hash code. */
Hash parseHash32(HashType ht, const string & s);

/* Parse a base-16 or base-32 representation of a hash code. */
Hash parseHash16or32(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;
typedef std::pair<Hash, unsigned long long> HashResult;
HashResult 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);


struct Ctx;

class HashSink : public BufferedSink
{
private:
    HashType ht;
    Ctx * ctx;
    unsigned long long bytes;

public:
    HashSink(HashType ht);
    HashSink(const HashSink & h);
    ~HashSink();
    void write(const unsigned char * data, size_t len);
    HashResult finish();
    HashResult currentHash();
};


}
n class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-07-12 23:08:15 +0200'>2020-07-12</span></td><td><a href='/guix/commit/gnu/packages/vnc.scm?id=b0e7b6992f3f845e83cfbca4d700b51dba50b4d5'>gnu: Remove ".git" from "https://github/…/….git".</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-05-11 11:54:36 +0300'>2020-05-11</span></td><td><a href='/guix/commit/gnu/packages/vnc.scm?id=d58c9574b3ea91bd796e6072d2ee2ba941abb9c7'>gnu: tigervnc-server: Update to 1.10.1-1.920d9c4.</a><span class='msg-avail'>...</span></td><td>Oleg Pykhalov</td></tr>
<tr><td><span title='2020-01-23 23:11:11 +0100'>2020-01-23</span></td><td><a href='/guix/commit/gnu/packages/vnc.scm?id=12d8adbfc0f32a1905cfc3aaa2cfff68ee46a333'>Merge branch 'staging' into core-updates</a></td><td>Marius Bakke</td></tr>
<tr><td><span title='2020-01-22 12:43:49 +0100'>2020-01-22</span></td><td><a href='/guix/commit/gnu/packages/vnc.scm?id=a789f654a0f370720b2c6b7856b9971dcc1d5eb1'>gnu: Add libvnc.</a><span class='msg-avail'>...</span></td><td>Hartmut Goebel</td></tr>
<tr><td><span title='2020-01-22 12:43:48 +0100'>2020-01-22</span></td><td><a href='/guix/commit/gnu/packages/vnc.scm?id=94c7ef932a5857020c2a5349ff1970b1809a080e'>gnu: Rename module gnutls to tls.</a><span class='msg-avail'>...</span></td><td>Hartmut Goebel</td></tr>