mirror of
https://github.com/alliedmodders/amxmodx.git
synced 2024-12-25 22:35:37 +03:00
375 lines
8.2 KiB
C++
Executable File
375 lines
8.2 KiB
C++
Executable File
/* AMX Mod X
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*
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* by the AMX Mod X Development Team
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* originally developed by OLO
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* In addition, as a special exception, the author gives permission to
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* link the code of this program with the Half-Life Game Engine ("HL
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* Engine") and Modified Game Libraries ("MODs") developed by Valve,
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* L.L.C ("Valve"). You must obey the GNU General Public License in all
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* respects for all of the code used other than the HL Engine and MODs
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* from Valve. If you modify this file, you may extend this exception
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* to your version of the file, but you are not obligated to do so. If
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* you do not wish to do so, delete this exception statement from your
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* version.
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*/
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#include "amxmodx.h"
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#include "amxxfile.h"
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#include "zlib/zlib.h"
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/**********************
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****** AMXXFILE ******
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**********************/
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#if defined __GNUC__
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#define PACKED __attribute__((packed))
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#else
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#define PACKED
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#endif
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#if defined(__linux__) || defined(__APPLE__)
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#pragma pack(1) /* structures must be packed (byte-aligned) */
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#else
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#pragma pack(1) /* structures must be packed (byte-aligned) */
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#if defined __TURBOC__
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#pragma option -a- /* "pack" pragma for older Borland compilers */
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#endif
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#endif
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struct TableEntry
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{
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mint8_t cellSize;
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mint32_t origSize PACKED; // contains AMX_HEADER->stp
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mint32_t offset PACKED;
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};
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#define DATAREAD(addr, itemsize, itemcount) \
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if (fread((addr), (itemsize), (itemcount), (m_pFile)) != (itemcount)) \
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{ \
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if (feof(m_pFile)) \
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m_Status = Err_FileInvalid; \
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else \
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m_Status = Err_FileRead; \
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fclose(m_pFile); \
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m_pFile = NULL; \
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return; \
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}
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CAmxxReader::CAmxxReader(const char *filename, int cellsize)
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{
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m_Bh.plugins = NULL;
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m_AmxxFile = false;
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if (!filename)
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{
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m_Status = Err_InvalidParam;
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return;
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}
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m_Status = Err_None;
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m_CellSize = cellsize;
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m_pFile = fopen(filename, "rb");
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if (!m_pFile)
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{
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m_Status = Err_FileOpen;
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return;
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}
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mint32_t magic;
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DATAREAD(&magic, sizeof(magic), 1);
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m_OldFile = false;
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if (magic == 0x524C4542)
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{
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//we have an invalid, old, RLEB file
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m_Status = Err_OldFile;
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fclose(m_pFile);
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m_pFile = NULL;
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return;
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}
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else if (magic == MAGIC_HEADER2)
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{
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DATAREAD(&m_Bh.version, sizeof(int16_t), 1);
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if (m_Bh.version > MAGIC_VERSION)
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{
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m_Status = Err_OldFile;
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fclose(m_pFile);
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m_pFile = NULL;
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return;
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}
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m_AmxxFile = true;
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DATAREAD(&m_Bh.numPlugins, sizeof(mint8_t), 1);
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m_Bh.plugins = new PluginEntry[m_Bh.numPlugins];
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PluginEntry *pe;
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m_SectionHdrOffset = 0;
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m_Entry = -1;
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for (mint8_t i = 0; i < m_Bh.numPlugins; i++)
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{
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pe = &(m_Bh.plugins[(unsigned)i]);
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DATAREAD(&pe->cellsize, sizeof(mint8_t), 1);
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DATAREAD(&pe->disksize, sizeof(int32_t), 1);
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DATAREAD(&pe->imagesize, sizeof(int32_t), 1);
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DATAREAD(&pe->memsize, sizeof(int32_t), 1);
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DATAREAD(&pe->offs, sizeof(int32_t), 1);
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}
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for (mint8_t i = 0; i < m_Bh.numPlugins; i++)
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{
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pe = &(m_Bh.plugins[(unsigned)i]);
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if (pe->cellsize == m_CellSize)
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{
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m_Entry = i;
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break;
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}
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}
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if (m_Entry == -1)
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{
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m_Status = Err_SectionNotFound;
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fclose(m_pFile);
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m_pFile = NULL;
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return;
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}
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pe = &(m_Bh.plugins[m_Entry]);
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m_SectionLength = pe->disksize;
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}
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else if (magic == MAGIC_HEADER)
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{
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// try to find the section
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mint8_t numOfPlugins;
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DATAREAD(&numOfPlugins, sizeof(numOfPlugins), 1);
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TableEntry entry;
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m_SectionHdrOffset = 0;
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int i = 0;
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for (i = 0; i < static_cast<int>(numOfPlugins); ++i)
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{
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DATAREAD(&entry, sizeof(entry), 1);
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if (entry.cellSize == m_CellSize)
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{
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m_SectionHdrOffset = ftell(m_pFile) - sizeof(entry);
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break;
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}
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}
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if (!m_SectionHdrOffset)
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{
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m_Status = Err_SectionNotFound;
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fclose(m_pFile);
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m_pFile = NULL;
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return;
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}
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// compute section length
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if ((i + 1) < static_cast<int>(numOfPlugins))
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{
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// there is a next section
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TableEntry nextEntry;
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DATAREAD(&nextEntry, sizeof(nextEntry), 1);
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m_SectionLength = nextEntry.offset - entry.offset;
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} else {
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fseek(m_pFile, 0, SEEK_END);
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m_SectionLength = ftell(m_pFile) - (long)entry.offset;
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}
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} else {
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// check for old file
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AMX_HEADER hdr;
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rewind(m_pFile);
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fread(&hdr, sizeof(hdr), 1, m_pFile);
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amx_Align16(&hdr.magic);
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if (hdr.magic == AMX_MAGIC)
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{
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if (cellsize != 4)
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{
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m_Status = Err_SectionNotFound;
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fclose(m_pFile);
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m_pFile = NULL;
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return;
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}
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m_OldFile = true;
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return;
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} else {
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// no known file format
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m_Status = Err_FileInvalid;
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fclose(m_pFile);
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m_pFile = NULL;
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return;
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}
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}
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}
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CAmxxReader::~CAmxxReader()
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{
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if (m_pFile)
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{
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fclose(m_pFile);
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m_pFile = NULL;
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}
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if (m_Bh.plugins)
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{
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delete [] m_Bh.plugins;
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m_Bh.plugins = NULL;
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}
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}
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CAmxxReader::Error CAmxxReader::GetStatus()
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{
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return m_Status;
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}
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#undef DATAREAD
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#define DATAREAD(addr, itemsize, itemcount) \
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if (fread(addr, itemsize, itemcount, m_pFile) != itemcount) \
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{ \
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if (feof(m_pFile)) \
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m_Status = Err_FileInvalid; \
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else \
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m_Status = Err_FileRead; \
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fclose(m_pFile); \
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m_pFile = NULL; \
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return 0; \
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}
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size_t CAmxxReader::GetBufferSize()
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{
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if (!m_pFile)
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return 0;
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long save = ftell(m_pFile);
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if (m_OldFile)
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{
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rewind(m_pFile);
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AMX_HEADER hdr;
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DATAREAD(&hdr, sizeof(hdr), 1);
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fseek(m_pFile, save, SEEK_SET);
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return hdr.stp;
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}
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else if (m_AmxxFile)
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{
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PluginEntry *pe = &(m_Bh.plugins[m_Entry]);
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if (pe->imagesize > pe->memsize)
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return pe->imagesize + 1;
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return pe->memsize + 1;
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}
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fseek(m_pFile, m_SectionHdrOffset, SEEK_SET);
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TableEntry entry;
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DATAREAD(&entry, sizeof(entry), 1);
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fseek(m_pFile, save, SEEK_SET);
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return entry.origSize + 1; // +1 : safe
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}
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#undef DATAREAD
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#define DATAREAD(addr, itemsize, itemcount) \
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if (fread(addr, itemsize, itemcount, m_pFile) != static_cast<size_t>(itemcount)) \
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{ \
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if (feof(m_pFile)) \
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m_Status = Err_FileInvalid; \
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else \
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m_Status = Err_FileRead; \
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fclose(m_pFile); \
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m_pFile = NULL; \
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return m_Status; \
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}
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CAmxxReader::Error CAmxxReader::GetSection(void *buffer)
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{
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if (!m_pFile)
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return m_Status;
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if (m_OldFile)
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{
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// get file size
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fseek(m_pFile, 0, SEEK_END);
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long filesize = ftell(m_pFile);
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rewind(m_pFile);
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DATAREAD(buffer, 1, filesize);
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m_Status = Err_None;
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return m_Status;
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}
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else if (m_AmxxFile)
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{
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PluginEntry *pe = &(m_Bh.plugins[m_Entry]);
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char *tempBuffer = new char[m_SectionLength + 1];
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fseek(m_pFile, pe->offs, SEEK_SET);
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DATAREAD((void *)tempBuffer, 1, m_SectionLength);
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uLongf destLen = GetBufferSize();
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int result = uncompress((Bytef *)buffer, &destLen, (Bytef *)tempBuffer, m_SectionLength);
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delete [] tempBuffer;
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if (result != Z_OK)
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{
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AMXXLOG_Log("[AMXX] Zlib error encountered: %d(%d)", result, m_SectionLength);
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m_Status = Err_Decompress;
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return Err_Decompress;
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}
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return Err_None;
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} else {
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// new file type: go to the section table entry
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fseek(m_pFile, m_SectionHdrOffset, SEEK_SET);
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// go to the offset
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TableEntry entry;
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DATAREAD(&entry, sizeof(entry), 1);
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fseek(m_pFile, entry.offset, SEEK_SET);
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uLongf destLen = GetBufferSize();
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// read the data to a temporary buffer
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char *tempBuffer = new char[m_SectionLength + 1];
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//fread(tempBuffer, sizeof(char), m_SectionLength, m_pFile);
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DATAREAD((void*)tempBuffer, 1, m_SectionLength);
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// decompress
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int result = uncompress((Bytef *)buffer, &destLen, (Bytef *)tempBuffer, m_SectionLength);
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delete [] tempBuffer;
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if (result != Z_OK)
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{
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AMXXLOG_Log("[AMXX] Zlib error encountered: %d(%d)", result, m_SectionLength);
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m_Status = Err_Decompress;
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return Err_Decompress;
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}
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return Err_None;
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}
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}
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