bullet3/examples/Utils/b3BulletDefaultFileIO.h

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#ifndef B3_BULLET_DEFAULT_FILE_IO_H
#define B3_BULLET_DEFAULT_FILE_IO_H
#include "../CommonInterfaces/CommonFileIOInterface.h"
#include "b3ResourcePath.h"
#include <stdio.h>
#define B3_FILEIO_MAX_FILES 1024
struct b3BulletDefaultFileIO : public CommonFileIOInterface
{
static bool FileIOPluginFindFile(void* userPtr, const char* orgFileName, char* relativeFileName, int maxRelativeFileNameMaxLen)
{
b3BulletDefaultFileIO* fileIo = (b3BulletDefaultFileIO*) userPtr;
return fileIo->findFile(orgFileName, relativeFileName, maxRelativeFileNameMaxLen);
}
char m_prefix[1024];
FILE* m_fileHandles[B3_FILEIO_MAX_FILES];
int m_numFileHandles;
b3BulletDefaultFileIO(int fileIOType=0, const char* pathPrefix=0)
:CommonFileIOInterface(fileIOType, m_prefix),
m_numFileHandles(0)
{
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m_prefix[0] = 0;
if (pathPrefix)
{
sprintf(m_prefix,"%s", pathPrefix);
}
for (int i=0;i<B3_FILEIO_MAX_FILES;i++)
{
m_fileHandles[i]=0;
}
}
virtual ~b3BulletDefaultFileIO()
{
}
virtual int fileOpen(const char* fileName, const char* mode)
{
//search a free slot
int slot = -1;
for (int i=0;i<B3_FILEIO_MAX_FILES;i++)
{
if (m_fileHandles[i]==0)
{
slot=i;
break;
}
}
if (slot>=0)
{
FILE*f = ::fopen(fileName, mode);
if (f)
{
m_fileHandles[slot]=f;
} else
{
slot=-1;
}
}
return slot;
}
virtual int fileRead(int fileHandle, char* destBuffer, int numBytes)
{
if (fileHandle>=0 && fileHandle < B3_FILEIO_MAX_FILES)
{
FILE* f = m_fileHandles[fileHandle];
if (f)
{
int readBytes = ::fread(destBuffer, 1, numBytes, f);
return readBytes;
}
}
return -1;
}
virtual int fileWrite(int fileHandle,const char* sourceBuffer, int numBytes)
{
if (fileHandle>=0 && fileHandle < B3_FILEIO_MAX_FILES)
{
FILE* f = m_fileHandles[fileHandle];
if (f)
{
return ::fwrite(sourceBuffer, 1, numBytes,m_fileHandles[fileHandle]);
}
}
return -1;
}
virtual void fileClose(int fileHandle)
{
if (fileHandle>=0 && fileHandle < B3_FILEIO_MAX_FILES)
{
FILE* f = m_fileHandles[fileHandle];
if (f)
{
::fclose(f);
m_fileHandles[fileHandle]=0;
}
}
}
virtual bool findResourcePath(const char* fileName, char* relativeFileName, int relativeFileNameSizeInBytes)
{
return b3ResourcePath::findResourcePath(fileName, relativeFileName, relativeFileNameSizeInBytes, b3BulletDefaultFileIO::FileIOPluginFindFile, this)>0;
}
virtual bool findFile(const char* orgFileName, char* relativeFileName, int maxRelativeFileNameMaxLen)
{
FILE* f = 0;
f = fopen(orgFileName, "rb");
if (f)
{
//printf("original file found: [%s]\n", orgFileName);
sprintf(relativeFileName, "%s", orgFileName);
fclose(f);
return true;
}
//printf("Trying various directories, relative to current working directory\n");
const char* prefix[] = {m_prefix, "./", "./data/", "../data/", "../../data/", "../../../data/", "../../../../data/"};
int numPrefixes = sizeof(prefix) / sizeof(const char*);
f = 0;
bool fileFound = false;
for (int i = 0; !f && i < numPrefixes; i++)
{
#ifdef _MSC_VER
sprintf_s(relativeFileName, maxRelativeFileNameMaxLen, "%s%s", prefix[i], orgFileName);
#else
sprintf(relativeFileName, "%s%s", prefix[i], orgFileName);
#endif
f = fopen(relativeFileName, "rb");
if (f)
{
fileFound = true;
break;
}
}
if (f)
{
fclose(f);
}
return fileFound;
}
virtual char* readLine(int fileHandle, char* destBuffer, int numBytes)
{
if (fileHandle>=0 && fileHandle < B3_FILEIO_MAX_FILES)
{
FILE* f = m_fileHandles[fileHandle];
if (f)
{
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char* txt = ::fgets(destBuffer, numBytes, m_fileHandles[fileHandle]);
for (int i=0;i<numBytes;i++)
{
if (destBuffer[i]=='\r'||destBuffer[i]=='\n' || destBuffer[i]==0)
{
destBuffer[i] = 0;
break;
}
}
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return txt;
}
}
return 0;
}
virtual int getFileSize(int fileHandle)
{
int size = 0;
if (fileHandle>=0 && fileHandle < B3_FILEIO_MAX_FILES)
{
FILE* f = m_fileHandles[fileHandle];
if (f)
{
if (fseek(f, 0, SEEK_END) || (size = ftell(f)) == EOF || fseek(f, 0, SEEK_SET))
{
printf("Error: Cannot access file to determine size\n");
}
}
}
return size;
}
virtual void enableFileCaching(bool enable)
{
(void) enable;
}
};
#endif //B3_BULLET_DEFAULT_FILE_IO_H