451ebf24ce
This re-implements the binary cache database in C++, allowing it to be used by other Store backends, in particular the S3 backend.
134 lines
3.1 KiB
C++
134 lines
3.1 KiB
C++
#pragma once
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#include "types.hh"
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#include "serialise.hh"
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namespace nix {
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MakeError(BadHash, Error);
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enum HashType : char { htUnknown, htMD5, htSHA1, htSHA256, htSHA512 };
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const int md5HashSize = 16;
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const int sha1HashSize = 20;
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const int sha256HashSize = 32;
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const int sha512HashSize = 64;
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extern const string base32Chars;
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struct Hash
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{
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static const unsigned int maxHashSize = 64;
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unsigned int hashSize;
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unsigned char hash[maxHashSize];
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HashType type;
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/* Create an unset hash object. */
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Hash();
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/* Create a zero-filled hash object. */
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Hash(HashType type);
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/* Check whether a hash is set. */
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operator bool () const { return type != htUnknown; }
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/* Check whether two hash are equal. */
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bool operator == (const Hash & h2) const;
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/* Check whether two hash are not equal. */
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bool operator != (const Hash & h2) const;
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/* For sorting. */
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bool operator < (const Hash & h) const;
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/* Returns the length of a base-16 representation of this hash. */
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size_t base16Len() const
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{
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return hashSize * 2;
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}
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/* Returns the length of a base-32 representation of this hash. */
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size_t base32Len() const
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{
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return (hashSize * 8 - 1) / 5 + 1;
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}
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std::string to_string(bool base32 = true) const;
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};
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/* Convert a hash to a hexadecimal representation. */
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string printHash(const Hash & hash);
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Hash parseHash(const string & s);
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/* Parse a hexadecimal representation of a hash code. */
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Hash parseHash(HashType ht, const string & s);
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/* Convert a hash to a base-32 representation. */
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string printHash32(const Hash & hash);
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/* Print a hash in base-16 if it's MD5, or base-32 otherwise. */
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string printHash16or32(const Hash & hash);
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/* Parse a base-32 representation of a hash code. */
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Hash parseHash32(HashType ht, const string & s);
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/* Parse a base-16 or base-32 representation of a hash code. */
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Hash parseHash16or32(HashType ht, const string & s);
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/* Verify that the given string is a valid hash code. */
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bool isHash(const string & s);
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/* Compute the hash of the given string. */
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Hash hashString(HashType ht, const string & s);
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/* Compute the hash of the given file. */
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Hash hashFile(HashType ht, const Path & path);
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/* Compute the hash of the given path. The hash is defined as
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(essentially) hashString(ht, dumpPath(path)). */
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struct PathFilter;
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extern PathFilter defaultPathFilter;
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typedef std::pair<Hash, unsigned long long> HashResult;
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HashResult hashPath(HashType ht, const Path & path,
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PathFilter & filter = defaultPathFilter);
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/* Compress a hash to the specified number of bytes by cyclically
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XORing bytes together. */
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Hash compressHash(const Hash & hash, unsigned int newSize);
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/* Parse a string representing a hash type. */
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HashType parseHashType(const string & s);
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/* And the reverse. */
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string printHashType(HashType ht);
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union Ctx;
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class HashSink : public BufferedSink
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{
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private:
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HashType ht;
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Ctx * ctx;
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unsigned long long bytes;
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public:
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HashSink(HashType ht);
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HashSink(const HashSink & h);
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~HashSink();
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void write(const unsigned char * data, size_t len);
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HashResult finish();
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HashResult currentHash();
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};
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}
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