amxmodx/modules/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 <am-string.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
*/
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NVault::NVault(const char *file)
{
m_File = file;
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m_Journal = NULL;
m_Open = false;
FILE *fp = fopen(m_File.chars(), "rb");
if (!fp)
{
fp = fopen(m_File.chars(), "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.chars(), "rb");
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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;
// 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;
if (!keylen || keylen > oldkeylen)
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{
if (key)
delete [] key;
key = new char[keylen + 1];
oldkeylen = keylen;
}
if (!vallen || vallen > oldvallen)
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{
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';
ArrayInfo info; info.value = val; info.stamp = stamp;
m_Hash.replace(key, info);
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}
// } 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.chars(), "wb");
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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;
ke::AString key;
ke::AString val;
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StringHashMap<ArrayInfo>::iterator iter = m_Hash.iter();
if (!bw.WriteUInt32(magic)) goto fail;
if (!bw.WriteUInt16(version)) goto fail;
if (!bw.WriteUInt32( m_Hash.elements() )) goto fail;
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while (!iter.empty())
{
key = (*iter).key;
val = (*iter).value.value;
stamp = (*iter).value.stamp;
if (!bw.WriteInt32(static_cast<int32_t>(stamp))) goto fail;;
if (!bw.WriteUInt8( key.length() )) goto fail;
if (!bw.WriteUInt16( val.length() )) goto fail;
if (!bw.WriteChars( key.chars(), key.length() )) goto fail;
if (!bw.WriteChars( val.chars(), val.length() )) goto fail;
iter.next();
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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)
{
StringHashMap<ArrayInfo>::Result r = m_Hash.find(key);
if (!r.found())
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{
return "";
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}
return r->value.value.chars();
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}
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bool NVault::Open()
{
_ReadFromFile();
char *journal_name = new char[m_File.length() + 10];
strcpy(journal_name, m_File.chars());
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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));
ArrayInfo info; info.value = val; info.stamp = time(NULL);
m_Hash.replace(key, info);
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}
void NVault::SetValue(const char *key, const char *val, time_t stamp)
{
if (m_Journal)
m_Journal->Write_Insert(key, val, stamp);
ArrayInfo info; info.value = val; info.stamp = stamp;
m_Hash.replace(key, info);
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}
void NVault::Remove(const char *key)
{
if (m_Journal)
m_Journal->Write_Remove(key);
m_Hash.remove(ke::AString(key).chars());
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}
void NVault::Clear()
{
if (m_Journal)
m_Journal->Write_Clear();
m_Hash.clear();
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}
size_t NVault::Items()
{
return m_Hash.elements();
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}
size_t NVault::Prune(time_t start, time_t end)
{
if (m_Journal)
m_Journal->Write_Prune(start, end);
size_t removed = 0;
for (StringHashMap<ArrayInfo>::iterator iter = m_Hash.iter(); !iter.empty(); iter.next())
{
time_t stamp = iter->value.stamp;
bool remove = false;
if (stamp != 0)
{
if (start == 0 && end == 0)
remove = true;
else if (start == 0 && stamp < end)
remove = true;
else if (end == 0 && stamp > start)
remove = true;
else if (stamp > start && stamp < end)
remove = true;
if (remove)
{
iter.erase();
removed++;
}
}
}
return removed;
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}
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void NVault::Touch(const char *key, time_t stamp)
{
StringHashMap<ArrayInfo>::Insert i = m_Hash.findForAdd(key);
if (!i.found())
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{
if (!m_Hash.add(i, key))
{
return;
}
SetValue(key, "", time(NULL));
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}
i->value.stamp = stamp;
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}
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bool NVault::GetValue(const char *key, time_t &stamp, char buffer[], size_t len)
{
ArrayInfo result;
if (!m_Hash.retrieve(key, &result))
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{
buffer[0] = '\0';
return false;
}
stamp = result.stamp;
UTIL_Format(buffer, len, "%s", result.value.chars());
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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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