bool CheckIfFileExists(const Path& p)
{
FILE *tempf = POV_UCS2_FOPEN(p().c_str(), "r");
if(tempf != NULL)
fclose(tempf);
else
return false;
return true;
}
POV_LONG GetFileLength(const Path& p)
{
FILE *tempf = POV_UCS2_FOPEN(p().c_str(), "rb");
POV_LONG result = -1;
if(tempf != NULL)
{
fseek(tempf, 0, SEEK_END);
result = ftell(tempf);
fclose(tempf);
}
return result;
}
IFileStream::IFileStream(const UCS2String& name) : IStream(name), f(NULL)
{
if(pov_stricmp(UCS2toASCIIString(name).c_str(), "stdin") == 0)
{
f = stdin;
}
else if((pov_stricmp(UCS2toASCIIString(name).c_str(), "stdout") == 0) ||
(pov_stricmp(UCS2toASCIIString(name).c_str(), "stderr") == 0))
{
f = NULL;
}
else
{
f = POV_UCS2_FOPEN(name, "rb");
}
fail = (f == NULL);
}
OStream::OStream(const UCS2String& name, unsigned int Flags) : IOBase(name), f(NULL)
{
const char* mode;
if((Flags & append) == 0)
{
mode = "wb";
}
else
{
// we cannot use append mode here, since "a" mode is totally incompatible with any
// output file format that requires in-place updates(i.e. writing to any location
// other than the end of the file). BMP files are in this category. In theory, "r+"
// can do anything "a" can do(with appropriate use of seek()) so append mode should
// not be needed.
mode = "r+b";
}
if(pov_stricmp(UCS2toASCIIString(name).c_str(), "stdin") == 0)
{
f = NULL;
}
else if(pov_stricmp(UCS2toASCIIString(name).c_str(), "stdout") == 0)
{
if((Flags & append) != 0)
f = NULL;
else
f = stdout;
}
else if(pov_stricmp(UCS2toASCIIString(name).c_str(), "stderr") == 0)
{
if((Flags & append) != 0)
f = NULL;
else
f = stdout;
}
else
{
f = POV_UCS2_FOPEN(name, mode);
if (f == NULL)
{
if((Flags & append) == 0)
f = NULL;
else
{
// to maintain traditional POV +c(continue) mode compatibility, if
// the open for append of an existing file fails, we allow a new file
// to be created.
mode = "wb";
f = POV_UCS2_FOPEN(name, mode);
}
}
if (f != NULL)
{
if((Flags & append) != 0)
{
if(!seekg(0, seek_end))
{
fclose(f);
f = NULL;
}
}
}
}
fail = (f == NULL);
}
bool IOBase::open(const UCS2String& name, unsigned int Flags /* = 0 */)
{
char mode[8];
close();
filename = name;
if((Flags & append) == 0)
{
switch(direction)
{
case input:
strcpy(mode, "r");
break;
case output:
strcpy(mode, "w");
break;
case io:
strcpy(mode, "w+");
break;
default:
return false;
}
}
else
{
// we cannot use append mode here, since "a" mode is totally incompatible with any
// output file format that requires in-place updates(i.e. writing to any location
// other than the end of the file). BMP files are in this category. In theory, "r+"
// can do anything "a" can do(with appropriate use of seek()) so append mode should
// not be needed.
strcpy(mode, "r+");
}
strcat(mode, "b");
f = NULL;
if(pov_stricmp(UCS2toASCIIString(name).c_str(), "stdin") == 0)
{
if(direction != input ||(Flags & append) != 0)
return false;
f = stdin;
}
else if(pov_stricmp(UCS2toASCIIString(name).c_str(), "stdout") == 0)
{
if(direction != output ||(Flags & append) != 0)
return false;
f = stdout;
}
else if(pov_stricmp(UCS2toASCIIString(name).c_str(), "stderr") == 0)
{
if(direction != output ||(Flags & append) != 0)
return false;
f = stderr;
}
else
{
if((f = POV_UCS2_FOPEN(name, mode)) == NULL)
{
if((Flags & append) == 0)
return false;
// to maintain traditional POV +c(continue) mode compatibility, if
// the open for append of an existing file fails, we allow a new file
// to be created.
mode [0] = 'w';
if((f = POV_UCS2_FOPEN(name, mode)) == NULL)
return false;
}
}
fail = false;
if((Flags & append) != 0)
{
if(!seekg(0, seek_end))
{
close();
return false;
}
}
return true;
}
