/****************************************************************************
REMARKS:
VxD implementation of the ANSI C fread function. Note that the VxD file I/O
functions are layered on DOS, so can only read up to 64K at a time. Since
we are expected to handle much larger chunks than this, we handle larger
blocks automatically in here.
****************************************************************************/
size_t fread(
void *ptr,
size_t size,
size_t n,
FILE *f)
{
char *buf = ptr;
WORD error;
int bytes = size * n;
int readbytes,totalbytes = 0;
while (bytes > 0x10000) {
if (initComplete) {
readbytes = R0_ReadFile(false,(HANDLE)f->handle,buf,0x8000,f->offset,&error);
readbytes += R0_ReadFile(false,(HANDLE)f->handle,buf+0x8000,0x8000,f->offset+0x8000,&error);
}
else {
readbytes = i_read(f->handle,buf,0x8000);
readbytes += i_read(f->handle,buf+0x8000,0x8000);
}
totalbytes += readbytes;
f->offset += readbytes;
buf += 0x10000;
bytes -= 0x10000;
}
if (bytes) {
if (initComplete)
readbytes = R0_ReadFile(false,(HANDLE)f->handle,buf,bytes,f->offset,&error);
else
readbytes = i_read(f->handle,buf,bytes);
totalbytes += readbytes;
f->offset += readbytes;
}
return totalbytes / size;
}
/****************************************************************************
REMARKS:
VxD implementation of the ANSI C fread function. Note that the VxD file I/O
functions are layered on DOS, so can only read up to 64K at a time. Since
we are expected to handle much larger chunks than this, we handle larger
blocks automatically in here.
****************************************************************************/
size_t fread(
void *ptr,
size_t size,
size_t n,
FILE *f)
{
char *buf = ptr;
WORD error;
int bytes,readbytes,totalbytes = 0;
/* First copy any data already read into our buffer */
if ((bytes = (f->curp - f->startp)) > 0) {
memcpy(buf,f->curp,bytes);
f->startp = f->curp = f->buf;
buf += bytes;
totalbytes += bytes;
bytes = (size * n) - bytes;
}
else
bytes = size * n;
while (bytes > 0x10000) {
if (initComplete) {
readbytes = R0_ReadFile(false,(HANDLE)f->handle,buf,0x8000,f->offset,&error);
readbytes += R0_ReadFile(false,(HANDLE)f->handle,buf+0x8000,0x8000,f->offset+0x8000,&error);
}
else {
readbytes = i_read(f->handle,buf,0x8000);
readbytes += i_read(f->handle,buf+0x8000,0x8000);
}
totalbytes += readbytes;
f->offset += readbytes;
buf += 0x10000;
bytes -= 0x10000;
}
if (bytes) {
if (initComplete)
readbytes = R0_ReadFile(false,(HANDLE)f->handle,buf,bytes,f->offset,&error);
else
readbytes = i_read(f->handle,buf,bytes);
totalbytes += readbytes;
f->offset += readbytes;
}
return totalbytes / size;
}
