125 lines
2.3 KiB
C++
125 lines
2.3 KiB
C++
#include <iostream>
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extern "C" {
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#include "md5.h"
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}
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#include "hash.hh"
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#include "archive.hh"
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Hash::Hash()
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{
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memset(hash, 0, sizeof(hash));
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}
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bool Hash::operator == (const Hash & h2) const
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{
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for (unsigned int i = 0; i < hashSize; i++)
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if (hash[i] != h2.hash[i]) return false;
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return true;
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}
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bool Hash::operator != (const Hash & h2) const
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{
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return !(*this == h2);
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}
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bool Hash::operator < (const Hash & h) const
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{
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for (unsigned int i = 0; i < hashSize; i++) {
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if (hash[i] < h.hash[i]) return true;
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if (hash[i] > h.hash[i]) return false;
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}
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return false;
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}
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Hash::operator string() const
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{
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ostringstream str;
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for (unsigned int i = 0; i < hashSize; i++) {
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str.fill('0');
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str.width(2);
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str << hex << (int) hash[i];
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}
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return str.str();
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}
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Hash parseHash(const string & s)
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{
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Hash hash;
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if (s.length() != Hash::hashSize * 2)
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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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throw Error(format("invalid hash `%1%'") % s);
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istringstream str(s2);
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int n;
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str >> hex >> n;
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hash.hash[i] = n;
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}
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return hash;
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}
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bool isHash(const string & s)
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{
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if (s.length() != 32) return false;
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for (int i = 0; i < 32; i++) {
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char c = s[i];
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if (!((c >= '0' && c <= '9') ||
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(c >= 'a' && c <= 'f')))
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return false;
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}
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return true;
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}
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Hash hashString(const string & s)
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{
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Hash hash;
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md5_buffer(s.c_str(), s.length(), hash.hash);
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return hash;
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}
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Hash hashFile(const Path & path)
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{
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Hash hash;
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FILE * file = fopen(path.c_str(), "rb");
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if (!file)
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throw SysError(format("file `%1%' does not exist") % path);
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int err = md5_stream(file, hash.hash);
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fclose(file);
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if (err) throw SysError(format("cannot hash file `%1%'") % path);
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return hash;
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}
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struct HashSink : DumpSink
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{
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struct md5_ctx ctx;
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virtual void operator ()
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(const unsigned char * data, unsigned int len)
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{
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md5_process_bytes(data, len, &ctx);
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}
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};
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Hash hashPath(const Path & path)
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{
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Hash hash;
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HashSink sink;
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md5_init_ctx(&sink.ctx);
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dumpPath(path, sink);
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md5_finish_ctx(&sink.ctx, hash.hash);
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return hash;
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}
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