amxmodx/dlls/nvault/NVault.cpp

263 lines
4.6 KiB
C++
Raw Normal View History

2005-07-31 06:07:48 +00:00
#include "NVault.h"
#include "Binary.h"
template <class K>
int HashFunction<String>(const K & k)
{
unsigned long hash = 5381;
const char *str = k.c_str();
char c;
while (c = *str++) hash = ((hash << 5) + hash) + c; // hash*33 + c
return hash;
}
template <class K>
bool Compare<String>(const K & k1, const K & k2)
{
return (strcmp(k1.c_str(),k2.c_str())==0);
}
NVault::NVault(const char *file)
{
m_File.assign(file);
m_Journal = NULL;
m_Open = false;
}
NVault::~NVault()
{
Close();
}
VaultError NVault::_ReadFromFile()
{
FILE *fp = fopen(m_File.c_str(), "rb");
if (!fp)
return Vault_NoFile;
//this is a little more optimized than the other version in the journal <_<
//I could optimize this more by embedding the position in the hash table but...
// the hash function can be changed. this could be fixed by storing a string and its
// resulting hash, and the entries could be ignored therein, but not right now.
//Also the string class could have embedded binary reading (like it does for text files)
BinaryReader br(fp);
uint8_t oldkeylen=0;
uint16_t oldvallen=0;
uint8_t keylen;
uint16_t vallen;
time_t stamp;
char *key = NULL;
char *val = NULL;
String sKey;
String sVal;
try
{
int32_t magic = br.ReadUInt32();
if (magic != VAULT_MAGIC)
return Vault_BadFile;
int16_t version = br.ReadUInt16();
if (version != VAULT_VERSION)
return Vault_OldFile;
int32_t entries = br.ReadUInt32();
for (int32_t i=0; i<entries; i++)
{
stamp = static_cast<time_t>(br.ReadInt32());
keylen = br.ReadUInt8();
vallen = br.ReadUInt16();
if (keylen > oldkeylen)
{
if (key)
delete [] key;
key = new char[keylen + 1];
oldkeylen = keylen;
}
if (vallen > oldvallen)
{
if (val)
delete [] val;
val = new char[vallen + 1];
oldvallen = vallen;
}
br.ReadChars(key, keylen);
br.ReadChars(val, vallen);
key[keylen] = '\0';
val[vallen] = '\0';
sKey.assign(key);
sVal.assign(val);
m_Hash.Insert(sKey, sVal, stamp);
}
} catch (...) {
if (key)
{
delete [] key;
key = NULL;
}
if (val)
{
delete [] val;
val = NULL;
}
fclose(fp);
return Vault_Read;
}
fclose(fp);
return Vault_Ok;
}
bool NVault::_SaveToFile()
{
FILE *fp = fopen(m_File.c_str(), "wb");
if (!fp)
return false;
BinaryWriter bw(fp);
try
{
int32_t magic = VAULT_MAGIC;
int16_t version = VAULT_VERSION;
bw.WriteUInt32(magic);
bw.WriteUInt16(version);
bw.WriteUInt32( m_Hash.Size() );
time_t stamp;
String key;
String val;
NHash<String,String>::iterator iter = m_Hash.GetIter();
while (!iter.Done())
{
key = iter.GetKey();
val = iter.GetVal();
stamp = iter.GetStamp();
bw.WriteInt32(stamp);
bw.WriteUInt8( key.size() );
bw.WriteUInt16( val.size() );
bw.WriteChars( key.c_str(), key.size() );
bw.WriteChars( val.c_str(), val.size() );
iter.Next();
}
} catch (...) {
fclose(fp);
return false;
}
fclose(fp);
return true;
}
bool NVault::Open()
{
_ReadFromFile();
char *journal_name = new char[m_File.size() + 10];
strcpy(journal_name, m_File.c_str());
char *pos = strstr(journal_name, ".vault");
if (pos)
{
strcpy(pos, ".journal");
} else {
strcat(journal_name, ".journal");
}
m_Journal = new Journal(journal_name);
delete [] journal_name;
m_Journal->Replay(&m_Hash);
m_Journal->Erase();
m_Journal->Begin();
m_Open = true;
return true;
}
bool NVault::Close()
{
if (!m_Open)
return false;
_SaveToFile();
m_Journal->End();
m_Journal->Erase();
return true;
}
void NVault::SetValue(const char *key, const char *val)
{
if (m_Journal)
m_Journal->Write_Insert(key, val, time(NULL));
String sKey;
String sVal;
sKey.assign(key);
sVal.assign(val);
m_Hash.Insert(sKey, sVal);
}
void NVault::SetValue(const char *key, const char *val, time_t stamp)
{
if (m_Journal)
m_Journal->Write_Insert(key, val, stamp);
String sKey;
String sVal;
sKey.assign(key);
sVal.assign(val);
m_Hash.Insert(sKey, sVal, stamp);
}
void NVault::Remove(const char *key)
{
if (m_Journal)
m_Journal->Write_Remove(key);
String sKey(key);
m_Hash.Remove(sKey);
}
void NVault::Clear()
{
if (m_Journal)
m_Journal->Write_Clear();
m_Hash.Clear();
}
size_t NVault::Items()
{
return m_Hash.Size();
}
size_t NVault::Prune(time_t start, time_t end)
{
if (m_Journal)
m_Journal->Write_Prune(start, end);
return m_Hash.Prune(start, end);
}
bool NVault::GetValue(const char *key, time_t &stamp, char buffer[], size_t len)
{
String sKey(key);
if (!m_Hash.Exists(sKey))
{
buffer[0] = '\0';
return false;
}
time_t st;
String sVal;
sVal = m_Hash.Retrieve(sKey, st);
stamp = st;
_snprintf(buffer, len, "%s", sVal.c_str());
return true;
}