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// -*- C++ -*-
/*
* Simple MultimEdia LiTerator(SMELT)
* by Chris Xiong 2015
* DaTaPack format support implementation
*
* WARNING: This library is in development and interfaces would be very
* unstable.
* This library is developed for the BLR series games.
*/
#include "smdatapack.hpp"
#include <cstdio>
#include <cstring>
#define gzgetDWORD(f) ((gzgetc(f)<<24)|(gzgetc(f)<<16)|(gzgetc(f)<<8)|(gzgetc(f)))&0xFFFFFFFF
#define gch ((*(cp++))&0xFF)
#define mmgetDWORD ((gch<<24)|(gch<<16)|(gch<<8)|(gch))&0xFFFFFFFF
#define gzputDWORD(f,a) gzputc(f,a>>24);gzputc(f,(a>>16)&0xFF);gzputc(f,(a>>8)&0xFF);gzputc(f,a&0xFF);
bool smDtpFileR::openDtp(const char* path)
{
file=gzopen(path,"r");
if(!file)return false;enmemory=false;msize=0;
if(gzgetc(file)!='D')return false;
if(gzgetc(file)!='T')return false;
if(gzgetc(file)!='P')return false;
fcnt=gzgetc(file);
for(int i=0;i<fcnt;++i)
{
int pl=gzgetc(file);
smFileInfo f;
f.path=new char[pl+1];f.data=NULL;
for(int j=0;j<pl;++j)f.path[j]=gzgetc(file);
f.path[pl]='\0';
f.size=gzgetDWORD(file);
f.offset=gzgetDWORD(file);
f.crc=gzgetDWORD(file);
m[std::string(f.path)]=f;
}
}
bool smDtpFileR::openDtpFromMemory(const char* ptr,DWORD size)
{
enmemory=true;msize=size;
if(!ptr||size<4)return false;
if(ptr[0]!='D'||ptr[1]!='T'||ptr[2]!='P')return false;
cp=ptr+3;bp=ptr;
fcnt=*(cp++);
for(int i=0;i<fcnt;++i)
{
int pl=*(cp++);
smFileInfo f;
f.path=new char[pl+1];f.data=NULL;
for(int j=0;j<pl;++j)f.path[j]=*(cp++);
f.path[pl]='\0';
f.size=mmgetDWORD;
f.offset=mmgetDWORD;
f.crc=mmgetDWORD;
m[std::string(f.path)]=f;
}
}
void smDtpFileR::closeDtp()
{
for(std::map<std::string,smFileInfo>::iterator i=m.begin();i!=m.end();++i)
{
delete[] i->second.path;i->second.path=NULL;
if(i->second.data){delete[] i->second.data;i->second.data=NULL;}
i->second.size=i->second.offset=i->second.crc=0;
}
fcnt=0;
m.clear();if(!enmemory){gzclose(file);file=0;}
}
char* smDtpFileR::getFirstFile(){return m.begin()->second.path;}
char* smDtpFileR::getLastFile(){return (--m.end())->second.path;}
char* smDtpFileR::getNextFile(const char* path)
{
std::map<std::string,smFileInfo>::iterator i=m.find(std::string(path));
if(i==m.end()||(++i)==m.end())return NULL;
return i->second.path;
}
char* smDtpFileR::getPrevFile(const char* path)
{
std::map<std::string,smFileInfo>::iterator i=m.find(std::string(path));
if(i==m.end()||i==m.begin())return NULL;--i;
return i->second.path;
}
char* smDtpFileR::getFilePtr(const char* path)
{
std::string fns(path);
if(m.find(fns)==m.end()){printf("error: file not found in the archive.\n");return NULL;}
if(m.at(fns).data)return m.at(fns).data;
else
{
if(!m.at(fns).size){printf("error: empty file.\n");return NULL;}
if(!enmemory)
gzseek(file,m[fns].offset,SEEK_SET);
else
cp=bp+m[fns].offset;
m[fns].data=new char[m[fns].size];
if(!enmemory)
{
int r=gzread(file,m[fns].data,m[fns].size);
if(r<m[fns].size){delete[] m[fns].data;printf("error: file size mismatch.\n");return m[fns].data=NULL;}
}
else
{
if((cp-bp)+m[fns].size>msize){delete[] m[fns].data;printf("error: file size mismatch.\n");return m[fns].data=NULL;}
memcpy(m[fns].data,cp,m[fns].size);
}
DWORD crc=crc32(0,(Bytef*)m[fns].data,m[fns].size);
if(crc!=m[fns].crc)
{delete[] m[fns].data;printf("error: crc mismatch.\n");return m[fns].data=NULL;}
return m[fns].data;
}
}
void smDtpFileR::releaseFilePtr(const char* path)
{
std::string fns(path);
if(m.find(fns)==m.end()){printf("error: file not found in the archive.\n");return;}
if(m[fns].data)
{
delete[] m[fns].data;
m[fns].data=NULL;
}
}
DWORD smDtpFileR::getFileSize(const char* path)
{if(m.find(std::string(path))==m.end()){printf("error: file not found in the archive.\n");return 0;}return m[std::string(path)].size;}
smDtpFileW::smDtpFileW(){fcnt=0;}
bool smDtpFileW::addFile(const char* path,const char* realpath)
{
FILE *pFile;DWORD size,rsize;
pFile=fopen(realpath,"rb");
if(!pFile)return false;
fseek(pFile,0,SEEK_END);size=ftell(pFile);rewind(pFile);
if(!size)return false;files[fcnt].data=NULL;
files[fcnt].data=new char[size];
if(!files[fcnt].data)return false;
files[fcnt].path=new char[strlen(path)+1];
strcpy(files[fcnt].path,path);
rsize=fread(files[fcnt].data,1,size,pFile);
if(rsize!=size)
{
delete[] files[fcnt].data;files[fcnt].data=NULL;
delete[] files[fcnt].path;files[fcnt].path=NULL;
return false;
}
files[fcnt].size=size;
files[fcnt].crc=crc32(0,(Bytef*)files[fcnt].data,files[fcnt].size);
++fcnt;
fclose(pFile);
return true;
}
bool smDtpFileW::writeDtp(const char* path)
{
gzFile file=gzopen(path,"w");
gzputs(file,"DTP");gzputc(file,fcnt);
int metasize=4;
for(int i=0;i<fcnt;++i)metasize+=strlen(files[i].path)+1+4+4+4;
files[0].offset=metasize;
for(int i=1;i<fcnt;++i)files[i].offset=files[i-1].offset+files[i-1].size;
for(int i=0;i<fcnt;++i)
{
gzputc(file,strlen(files[i].path));
gzputs(file,files[i].path);
gzputDWORD(file,files[i].size);
gzputDWORD(file,files[i].offset);
gzputDWORD(file,files[i].crc);
}
for(int i=0;i<fcnt;++i)gzwrite(file,(voidpc)files[i].data,files[i].size);
gzclose(file);
for(int i=0;i<fcnt;++i)
{
files[i].size=files[i].offset=files[i].crc=0;
delete[] files[i].data;files[i].data=NULL;
delete[] files[i].path;files[i].path=NULL;
}
fcnt=0;
return true;
}
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