void FileStream::SetStreamSize(int64 pos)
{
if(handle < 0) return;
LOFF_T_ cur = LSEEK64_(handle, 0, SEEK_CUR);
if(cur < 0) {
SetLastError();
return;
}
LOFF_T_ len = LSEEK64_(handle, 0, SEEK_END);
if(len < 0) {
SetLastError();
LSEEK64_(handle, cur, SEEK_SET);
return;
}
while(pos > len) {
static char buffer[1024];
int64 diff = pos - len;
int chunk = (diff > (int64)sizeof(buffer) ? sizeof(buffer) : (int)diff);
if(write(handle, buffer, chunk) != chunk) {
SetLastError();
LSEEK64_(handle, cur, SEEK_SET);
return;
}
len += chunk;
}
if(pos < len) {
if(cur > pos)
LSEEK64_(handle, cur = pos, SEEK_SET);
if(FTRUNCATE64_(handle, pos) < 0)
SetLastError();
}
if(LSEEK64_(handle, cur, SEEK_SET) < 0)
SetLastError();
}
bool FileStream::Open(const char *name, dword mode, mode_t tmode) {
Close();
int iomode = mode & ~SHAREMASK;
handle = open(ToSystemCharset(name), iomode == READ ? O_RDONLY :
iomode == CREATE ? O_CREAT|O_RDWR|O_TRUNC :
O_RDWR|O_CREAT,
tmode);
if(handle >= 0) {
if((mode & NOWRITESHARE) && flock(handle, LOCK_EX|LOCK_NB) < 0) {
close(handle);
handle = -1;
return false;
}
int64 fsz = LSEEK64_(handle, 0, SEEK_END);
if(fsz >= 0) {
OpenInit(mode, fsz);
return true;
}
}
SetLastError();
return false;
}
void FileStream::SetPos(int64 pos) {
ASSERT(IsOpen());
if(LSEEK64_(handle, pos, SEEK_SET) < 0)
SetLastError();
}