*/
size_t VFS_Write(int FD, size_t Length, const void *Buffer)
{
- tVFS_Handle *h;
- size_t ret;
-
- h = VFS_GetHandle(FD);
+ tVFS_Handle *h = VFS_GetHandle(FD);
if(!h) {
LOG("FD%i is not open", FD);
errno = EBADF;
return -1;
}
+ size_t ret = VFS_WriteAt(FD, h->Position, Length, Buffer);
+ if(ret == (size_t)-1) return -1;
+
+ if( !(h->Node->Type->Flags & VFS_NODETYPEFLAG_STREAM) )
+ h->Position += ret;
+ return ret;
+}
+
+/**
+ * \fn Uint64 VFS_WriteAt(int FD, Uint64 Offset, Uint64 Length, const void *Buffer)
+ * \brief Write data to a file at a given offset
+ */
+size_t VFS_WriteAt(int FD, Uint64 Offset, size_t Length, const void *Buffer)
+{
+ LOG("FD=%i,Offset=%lli,Length=%i,Buffer=%p",
+ FD, Offset, Length, Buffer);
+ tVFS_Handle *h = VFS_GetHandle(FD);
+ if(!h) return -1;
+
if( !(h->Mode & VFS_OPENFLAG_WRITE) ) {
LOG("FD%i not opened for writing", FD);
errno = EBADF;
return -1;
}
- if( !h->Node->Type || !h->Node->Type->Write ) {
+ const tVFS_NodeType* nodetype = h->Node->Type;
+ if(!nodetype || !nodetype->Write) {
LOG("FD%i has no write method", FD);
errno = EINTERNAL;
return 0;
}
-
- if( !MM_GetPhysAddr(h->Node->Type->Write) ) {
+
+ if( !MM_GetPhysAddr(nodetype->Write) ) {
Log_Error("VFS", "Node type %p(%s) write method is junk %p",
- h->Node->Type, h->Node->Type->TypeName,
- h->Node->Type->Write);
+ nodetype, nodetype->TypeName, nodetype->Write);
errno = EINTERNAL;
return -1;
}
- Uint flags = 0;
- flags |= (h->Mode & VFS_OPENFLAG_NONBLOCK) ? VFS_IOFLAG_NOBLOCK : 0;
- ret = h->Node->Type->Write(h->Node, h->Position, Length, Buffer, flags);
- if(ret != Length) LOG("%i/%i written", ret, Length);
- if(ret == (size_t)-1) return -1;
-
- h->Position += ret;
- return ret;
-}
-
-/**
- * \fn Uint64 VFS_WriteAt(int FD, Uint64 Offset, Uint64 Length, const void *Buffer)
- * \brief Write data to a file at a given offset
- */
-size_t VFS_WriteAt(int FD, Uint64 Offset, size_t Length, const void *Buffer)
-{
- tVFS_Handle *h;
- size_t ret;
-
- h = VFS_GetHandle(FD);
- if(!h) return -1;
-
- if( !(h->Mode & VFS_OPENFLAG_WRITE) ) return -1;
- if( h->Node->Flags & VFS_FFLAG_DIRECTORY ) return -1;
-
- if(!h->Node->Type || !h->Node->Type->Write) return 0;
-
- if( !MM_GetPhysAddr(h->Node->Type->Write) ) {
- Log_Error("VFS", "Node type %p(%s) write method is junk %p",
- h->Node->Type, h->Node->Type->TypeName,
- h->Node->Type->Write);
- return -1;
+ // Bounds checks
+ if( h->Node->Size != (Uint64)-1 && Offset > h->Node->Size ) {
+ Log_Notice("VFS", "Write starting past EOF of FD%x (%lli > %lli)",
+ FD, Offset, h->Node->Size);
+ //errno = ESPIPE;
+ return 0;
+ }
+ if( Offset + Length > h->Node->Size )
+ {
+ // Going OOB
+ if( !nodetype->Truncate )
+ {
+ LOG("No .Truncate method, emiting write past EOF");
+ }
+ else if( nodetype->Flags & VFS_NODETYPEFLAG_NOAUTOEXPAND )
+ {
+ LOG("NOAUTOEXPAND set, truncating length from %i to %i",
+ Length, h->Node->Size - Offset);
+ Length = h->Node->Size - Offset;
+ }
+ else if( nodetype->Truncate(h->Node, Offset + Length) != Offset + Length )
+ {
+ // oh... fail? Truncate to current size
+ LOG(".Truncate failed, truncating length from %i to %i",
+ Length, h->Node->Size - Offset);
+ Length = h->Node->Size - Offset;
+ }
+ else
+ {
+ // Expansion, node size should now fit
+ LOG("Expanded file");
+ }
}
+
+ // Create flag set
Uint flags = 0;
flags |= (h->Mode & VFS_OPENFLAG_NONBLOCK) ? VFS_IOFLAG_NOBLOCK : 0;
- ret = h->Node->Type->Write(h->Node, Offset, Length, Buffer, flags);
+
+ // Dispatch the read!
+ size_t ret = nodetype->Write(h->Node, Offset, Length, Buffer, flags);
if(ret == (size_t)-1) return -1;
+ if(ret != Length) LOG("%i/%i written", ret, Length);
+
return ret;
}
*/
int VFS_Seek(int FD, Sint64 Offset, int Whence)
{
- tVFS_Handle *h;
-
- h = VFS_GetHandle(FD);
+ tVFS_Handle *h = VFS_GetHandle(FD);
if(!h) return -1;
+ if( (h->Node->Type->Flags & VFS_NODETYPEFLAG_STREAM) ) {
+ LOG("Seeking in stream");
+ return -1;
+ }
+
// Set relative to current position
if(Whence == 0) {
LOG("(FD%x)->Position += %lli", FD, Offset);
return 0;
}
+/*
+ * Truncate/Expand a file's allocation
+ */
+off_t VFS_Truncate(int FD, off_t Size)
+{
+ tVFS_Handle *h = VFS_GetHandle(FD);
+ if(!h) {
+ errno = EBADF;
+ return -1;
+ }
+
+ if( !h->Node->Type->Truncate)
+ {
+ Log_Notice("VFS", "Nodetype '%s' doesn't have a Truncate method", h->Node->Type->TypeName);
+ errno = ENOTIMPL;
+ return -1;
+ }
+
+ return h->Node->Type->Truncate(h->Node, Size);
+}
+
/**
* \fn int VFS_IOCtl(int FD, int ID, void *Buffer)
* \brief Call an IO Control on a file
*/
int VFS_IOCtl(int FD, int ID, void *Buffer)
{
- tVFS_Handle *h;
-
- h = VFS_GetHandle(FD);
+ tVFS_Handle *h = VFS_GetHandle(FD);
if(!h) {
LOG("FD%i is invalid", FD);
errno = EINVAL;