/**
* write data to obj, return remain data (0 if all data been written).
*/
static int do_WriteObject(uffs_Object *obj, const void *data, int len)
{
uffs_Device *dev = obj->dev;
TreeNode *fnode = obj->node;
int remain = len;
u16 fdn;
u32 write_start;
TreeNode *dnode;
u32 size;
while (remain > 0) {
write_start = obj->pos + len - remain;
if (write_start > fnode->u.file.len) {
uffs_Perror(UFFS_MSG_SERIOUS, "write point out of file ?");
break;
}
fdn = GetFdnByOfs(obj, write_start);
if (write_start == fnode->u.file.len && fdn > 0 &&
write_start == GetStartOfDataBlock(obj, fdn)) {
if (dev->tree.erased_count < dev->cfg.reserved_free_blocks) {
uffs_Perror(UFFS_MSG_NOISY, "insufficient block in write obj, new block");
break;
}
size = do_WriteNewBlock(obj, data ? (u8 *)data + len - remain : NULL,
remain, fnode->u.file.serial, fdn);
//
// Flush the new block buffers immediately, so that the new data node will be
// created and put in the tree.
//
// But before do that, we need to make sure the previous
// data block (if exist) been flushed first.
//
if (fdn > 1) {
uffs_BufFlushGroup(dev, fnode->u.file.serial, fdn - 1);
}
else {
uffs_BufFlushGroup(dev, fnode->u.file.parent, fnode->u.file.serial);
}
// Now flush the new block.
uffs_BufFlushGroup(dev, fnode->u.file.serial, fdn);
if (size == 0)
break;
remain -= size;
}
else {
if(fdn == 0)
dnode = obj->node;
else
dnode = uffs_TreeFindDataNode(dev, fnode->u.file.serial, fdn);
if(dnode == NULL) {
uffs_Perror(UFFS_MSG_SERIOUS, "can't find data node in tree ?");
obj->err = UEUNKNOWN_ERR;
break;
}
size = do_WriteInternalBlock(obj, dnode, fdn,
data ? (u8 *)data + len - remain : NULL, remain,
write_start - GetStartOfDataBlock(obj, fdn));
#ifdef CONFIG_FLUSH_BUF_AFTER_WRITE
if (fdn == 0)
uffs_BufFlushGroup(dev, fnode->u.file.parent, fnode->u.file.serial);
else
uffs_BufFlushGroup(dev, fnode->u.file.serial, fdn);
#endif
if (size == 0)
break;
remain -= size;
}
}
uffs_Assert(fnode == obj->node, "obj->node change!\n");
return remain;
}
/**
* write data to obj, from obj->pos
*
* \param[in] obj file obj
* \param[in] data data pointer
* \param[in] len length of data to be write
*
* \return bytes wrote to obj
*/
int uffs_WriteObject(uffs_Object *obj, const void *data, int len)
{
uffs_Device *dev = obj->dev;
TreeNode *fnode = obj->node;
int remain = len;
u16 fdn;
u32 write_start;
TreeNode *dnode;
u32 size;
if (obj == NULL)
return 0;
if (obj->dev == NULL || obj->open_succ != U_TRUE) {
obj->err = UEBADF;
return 0;
}
if (obj->type == UFFS_TYPE_DIR) {
uffs_Perror(UFFS_ERR_NOISY, "Can't write to an dir object!");
obj->err = UEACCES;
return 0;
}
if (obj->pos > fnode->u.file.len) {
return 0; //can't write file out of range
}
if (obj->oflag == UO_RDONLY) {
obj->err = UEACCES;
return 0;
}
uffs_ObjectDevLock(obj);
if (obj->oflag & UO_APPEND)
obj->pos = fnode->u.file.len;
while (remain > 0) {
write_start = obj->pos + len - remain;
if (write_start > fnode->u.file.len) {
uffs_Perror(UFFS_ERR_SERIOUS, "write point out of file ?");
break;
}
fdn = GetFdnByOfs(obj, write_start);
if (write_start == fnode->u.file.len && fdn > 0 &&
write_start == GetStartOfDataBlock(obj, fdn)) {
if (dev->tree.erased_count < MINIMUN_ERASED_BLOCK) {
uffs_Perror(UFFS_ERR_NOISY, "insufficient block in write obj, new block");
break;
}
size = do_WriteNewBlock(obj, (u8 *)data + len - remain, remain, fnode->u.file.serial, fdn);
//Flush immediately, so that the new data node will be created and put in the tree.
uffs_BufFlushGroup(dev, fnode->u.file.serial, fdn);
if (size == 0)
break;
remain -= size;
}
else {
if(fdn == 0)
dnode = obj->node;
else
dnode = uffs_TreeFindDataNode(dev, fnode->u.file.serial, fdn);
if(dnode == NULL) {
uffs_Perror(UFFS_ERR_SERIOUS, "can't find data node in tree ?");
obj->err = UEUNKNOWN;
break;
}
size = do_WriteInternalBlock(obj, dnode, fdn,
(u8 *)data + len - remain, remain,
write_start - GetStartOfDataBlock(obj, fdn));
#ifdef CONFIG_FLUSH_BUF_AFTER_WRITE
uffs_BufFlushGroup(dev, fnode->u.file.serial, fdn);
#endif
if (size == 0)
break;
remain -= size;
}
}
obj->pos += (len - remain);
if (HAVE_BADBLOCK(dev))
uffs_BadBlockRecover(dev);
uffs_ObjectDevUnLock(obj);
return len - remain;
}
