amxmodx/dlls/nvault/NVault.cpp

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// vim: set ts=4 sw=4 tw=99 noet:
//
// AMX Mod X, based on AMX Mod by Aleksander Naszko ("OLO").
// Copyright (C) The AMX Mod X Development Team.
//
// This software is licensed under the GNU General Public License, version 3 or higher.
// Additional exceptions apply. For full license details, see LICENSE.txt or visit:
// https://alliedmods.net/amxmodx-license
//
// NVault Module
//
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#include <stdio.h>
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#include "amxxmodule.h"
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#include "NVault.h"
#include "Binary.h"
#include "CString.h"
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/**
* :TODO: This beast calls strcpy()/new() way too much by creating new strings on the stack.
* That's easily remedied and it should be fixed?
* ---bail
*/
template <>
int HashFunction<String>(const String & k)
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{
unsigned long hash = 5381;
const char *str = k.c_str();
char c;
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while ((c = *str++))
{
hash = ((hash << 5) + hash) + c; // hash*33 + c
}
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return hash;
}
template <>
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int Compare<String>(const String & k1, const String & k2)
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{
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return strcmp(k1.c_str(),k2.c_str());
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}
NVault::NVault(const char *file)
{
m_File.assign(file);
m_Journal = NULL;
m_Open = false;
FILE *fp = fopen(m_File.c_str(), "rb");
if (!fp)
{
fp = fopen(m_File.c_str(), "wb");
if (!fp)
{
this->m_Valid = false;
return;
}
}
this->m_Valid = true;
fclose(fp);
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}
NVault::~NVault()
{
Close();
}
VaultError NVault::_ReadFromFile()
{
FILE *fp = fopen(m_File.c_str(), "rb");
if (!fp)
{
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return Vault_NoFile;
}
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//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
// {
uint32_t magic;
if (!br.ReadUInt32(magic)) goto fail;
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if (magic != VAULT_MAGIC)
return Vault_BadFile;
uint16_t version;
if (!br.ReadUInt16(version)) goto fail;
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if (version != VAULT_VERSION)
return Vault_OldFile;
int32_t entries;
if (!br.ReadInt32(entries)) goto fail;
int32_t temp;
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for (int32_t i=0; i<entries; i++)
{
if (!br.ReadInt32(temp)) goto fail;
stamp = static_cast<time_t>(temp);
if (!br.ReadUInt8(keylen)) goto fail;
if (!br.ReadUInt16(vallen)) goto fail;
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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;
}
if (!br.ReadChars(key, keylen)) goto fail;
if (!br.ReadChars(val, vallen)) goto fail;
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key[keylen] = '\0';
val[vallen] = '\0';
sKey.assign(key);
sVal.assign(val);
m_Hash.Insert(sKey, sVal, stamp);
}
// } catch (...) {
goto success;
fail:
if (key)
{
delete [] key;
key = NULL;
}
if (val)
{
delete [] val;
val = NULL;
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}
fclose(fp);
return Vault_Read;
// }
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success:
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fclose(fp);
return Vault_Ok;
}
bool NVault::_SaveToFile()
{
FILE *fp = fopen(m_File.c_str(), "wb");
if (!fp)
{
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return false;
}
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BinaryWriter bw(fp);
// try
// {
uint32_t magic = VAULT_MAGIC;
uint16_t version = VAULT_VERSION;
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time_t stamp;
String key;
String val;
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THash<String,String>::iterator iter = m_Hash.begin();
if (!bw.WriteUInt32(magic)) goto fail;
if (!bw.WriteUInt16(version)) goto fail;
if (!bw.WriteUInt32( m_Hash.Size() )) goto fail;
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while (iter != m_Hash.end())
{
key = (*iter).key;
val = (*iter).val;
stamp = (*iter).stamp;
if (!bw.WriteInt32(static_cast<int32_t>(stamp))) goto fail;;
if (!bw.WriteUInt8( key.size() )) goto fail;
if (!bw.WriteUInt16( val.size() )) goto fail;
if (!bw.WriteChars( key.c_str(), key.size() )) goto fail;
if (!bw.WriteChars( val.c_str(), val.size() )) goto fail;
iter++;
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}
goto success;
// } catch (...) {
fail:
fclose(fp);
return false;
// }
success:
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fclose(fp);
return true;
}
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const char *NVault::GetValue(const char *key)
{
String sKey(key);
if (!m_Hash.Exists(sKey))
{
return "";
} else {
return m_Hash.Retrieve(sKey).c_str();
}
}
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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();
if (!m_Journal->Begin())
{
delete m_Journal;
m_Journal = NULL;
}
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m_Open = true;
return true;
}
bool NVault::Close()
{
if (!m_Open)
return false;
_SaveToFile();
if (m_Journal)
{
m_Journal->End();
m_Journal->Erase();
}
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m_Open = false;
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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);
}
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void NVault::Touch(const char *key, time_t stamp)
{
String sKey(key);
if (!m_Hash.Exists(sKey))
{
SetValue(key, "", time(NULL));
}
m_Hash.Touch(key, stamp);
}
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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;
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UTIL_Format(buffer, len, "%s", sVal.c_str());
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return true;
}
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IVault *VaultMngr::OpenVault(const char *file)
{
NVault *pVault;
//try
//{
pVault = new NVault(file);
// } catch (...) {
if (!pVault->isValid())
{
delete pVault;
pVault = NULL;
}
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return static_cast<IVault *>(pVault);
}
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