forked from lix-project/lix
Simplify printHash32
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3688db3d43
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db2ec59903
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@ -84,7 +84,7 @@ string printHash(const Hash & hash)
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return string(buf, hash.hashSize * 2);
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}
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Hash parseHash(HashType ht, const string & s)
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{
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Hash hash(ht);
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@ -92,7 +92,7 @@ Hash parseHash(HashType ht, const string & s)
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throw Error(format("invalid hash ‘%1%’") % s);
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for (unsigned int i = 0; i < hash.hashSize; i++) {
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string s2(s, i * 2, 2);
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if (!isxdigit(s2[0]) || !isxdigit(s2[1]))
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if (!isxdigit(s2[0]) || !isxdigit(s2[1]))
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throw Error(format("invalid hash ‘%1%’") % s);
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std::istringstream str(s2);
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int n;
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@ -103,24 +103,6 @@ Hash parseHash(HashType ht, const string & s)
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}
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static unsigned char divMod(unsigned char * bytes, unsigned char y)
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{
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unsigned int borrow = 0;
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int pos = Hash::maxHashSize - 1;
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while (pos >= 0 && !bytes[pos]) --pos;
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for ( ; pos >= 0; --pos) {
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unsigned int s = bytes[pos] + (borrow << 8);
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unsigned int d = s / y;
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borrow = s % y;
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bytes[pos] = d;
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}
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return borrow;
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}
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unsigned int hashLength32(const Hash & hash)
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{
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return (hash.hashSize * 8 - 1) / 5 + 1;
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@ -136,19 +118,19 @@ string printHash32(const Hash & hash)
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Hash hash2(hash);
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unsigned int len = hashLength32(hash);
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const char * chars = base32Chars.data();
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string s(len, '0');
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string s;
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s.reserve(len);
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int pos = len - 1;
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while (pos >= 0) {
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unsigned char digit = divMod(hash2.hash, 32);
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s[pos--] = chars[digit];
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for (int n = len - 1; n >= 0; n--) {
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unsigned int b = n * 5;
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unsigned int i = b / 8;
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unsigned int j = b % 8;
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unsigned char c =
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(hash.hash[i] >> j)
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| (i >= hash.hashSize - 1 ? 0 : hash.hash[i + 1] << (8 - j));
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s.push_back(base32Chars[c & 0x1f]);
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}
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for (unsigned int i = 0; i < hash2.maxHashSize; ++i)
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assert(hash2.hash[i] == 0);
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return s;
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}
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@ -299,7 +281,7 @@ Hash hashFile(HashType ht, const Path & path)
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if (n == -1) throw SysError(format("reading file ‘%1%’") % path);
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update(ht, ctx, buf, n);
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}
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finish(ht, ctx, hash.hash);
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return hash;
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}
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@ -311,7 +293,7 @@ HashSink::HashSink(HashType ht) : ht(ht)
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bytes = 0;
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start(ht, *ctx);
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}
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HashSink::~HashSink()
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{
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bufPos = 0;
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@ -369,7 +351,7 @@ HashType parseHashType(const string & s)
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else return htUnknown;
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}
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string printHashType(HashType ht)
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{
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if (ht == htMD5) return "md5";
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@ -378,5 +360,5 @@ string printHashType(HashType ht)
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else throw Error("cannot print unknown hash type");
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}
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}
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