/**
* Searches shim database for a next tag which matches prev_child within parent's domain.
*
* @param [in] pdb Handle to the shim database.
* @param [in] parent TAGID of parent.
* @param [in] prev_child TAGID of previous match.
*
* @return Success: TAGID of next match, Failure: TAGID_NULL.
*/
TAGID WINAPI SdbFindNextTag(PDB pdb, TAGID parent, TAGID prev_child)
{
TAG tag;
TAGID iter;
tag = SdbGetTagFromTagID(pdb, prev_child);
iter = SdbGetNextChild(pdb, parent, prev_child);
while (iter != TAGID_NULL)
{
if (SdbGetTagFromTagID(pdb, iter) == tag)
return iter;
iter = SdbGetNextChild(pdb, parent, iter);
}
return TAGID_NULL;
}
BOOL WINAPI SdbpCheckTagIDType(PDB db, TAGID tagid, WORD type)
{
TAG tag = SdbGetTagFromTagID(db, tagid);
if (tag == TAG_NULL)
return FALSE;
return SdbpCheckTagType(tag, type);
}
/**
* Searches shim database for a tag within specified domain.
*
* @param [in] pdb Handle to the shim database.
* @param [in] parent TAGID of parent.
* @param [in] tag TAG to be located.
*
* @return Success: TAGID of first matching tag, Failure: TAGID_NULL.
*/
TAGID WINAPI SdbFindFirstTag(PDB pdb, TAGID parent, TAG tag)
{
TAGID iter;
iter = SdbGetFirstChild(pdb, parent);
while (iter != TAGID_NULL)
{
if (SdbGetTagFromTagID(pdb, iter) == tag)
return iter;
iter = SdbGetNextChild(pdb, parent, iter);
}
return TAGID_NULL;
}
static DWORD WINAPI SdbpGetTagSize(PDB pdb, TAGID tagid)
{
WORD type;
DWORD size;
type = SdbGetTagFromTagID(pdb, tagid) & TAG_TYPE_MASK;
if (type == TAG_NULL)
return 0;
size = SdbGetTagDataSize(pdb, tagid);
if (type <= TAG_TYPE_STRINGREF)
return size += sizeof(TAG);
else size += (sizeof(TAG) + sizeof(DWORD));
return size;
}
/**
* Searches shim database for a child of specified parent tag.
*
* @param [in] pdb Handle to the shim database.
* @param [in] parent TAGID of parent.
*
* @return Success: TAGID of child tag, Failure: TAGID_NULL.
*/
TAGID WINAPI SdbGetFirstChild(PDB pdb, TAGID parent)
{
/* if we are at beginning of database */
if (parent == TAGID_ROOT)
{
/* header only database: no tags */
if (pdb->size <= _TAGID_ROOT)
return TAGID_NULL;
/* return *real* root tagid */
else return _TAGID_ROOT;
}
/* only list tag can have children */
if ((SdbGetTagFromTagID(pdb, parent) & TAG_TYPE_MASK) != TAG_TYPE_LIST)
return TAGID_NULL;
/* first child is sizeof(TAG) + sizeof(DWORD) bytes after beginning of list */
return parent + sizeof(TAG) + sizeof(DWORD);
}
LPWSTR WINAPI SdbpGetString(PDB pdb, TAGID tagid, PDWORD size)
{
TAG tag;
TAGID offset;
tag = SdbGetTagFromTagID(pdb, tagid);
if (tag == TAG_NULL)
return NULL;
if ((tag & TAG_TYPE_MASK) == TAG_TYPE_STRINGREF)
{
/* No stringtable; all references are invalid */
if (pdb->stringtable == TAGID_NULL)
return NULL;
/* TAG_TYPE_STRINGREF contains offset of string relative to stringtable */
if (!SdbpReadData(pdb, &tagid, tagid + sizeof(TAG), sizeof(TAGID)))
return NULL;
offset = pdb->stringtable + tagid + sizeof(TAG) + sizeof(TAGID);
}
else if ((tag & TAG_TYPE_MASK) == TAG_TYPE_STRING)
{
offset = tagid + sizeof(TAG) + sizeof(TAGID);
}
else
{
SHIM_ERR("Tag 0x%u at tagid %u is neither a string or reference to string\n", tag, tagid);
return NULL;
}
/* Optionally read string size */
if (size && !SdbpReadData(pdb, size, offset - sizeof(TAGID), sizeof(*size)))
return FALSE;
return (LPWSTR)(&pdb->data[offset]);
}
/**
* Retrieves size of data at specified tagid.
*
* @param [in] pdb Handle to the shim database.
* @param [in] tagid Tagid of tag whose size is queried.
*
* @return Success: Size of data at specified tagid, Failure: 0.
*/
DWORD WINAPI SdbGetTagDataSize(PDB pdb, TAGID tagid)
{
/* sizes of data types with fixed size */
static const SIZE_T sizes[6] = {
0, /* NULL */ 1, /* BYTE */
2, /* WORD */ 4, /* DWORD */
8, /* QWORD */ 4 /* STRINGREF */
};
WORD type;
DWORD size;
type = SdbGetTagFromTagID(pdb, tagid) & TAG_TYPE_MASK;
if (type == TAG_NULL)
return 0;
if (type <= TAG_TYPE_STRINGREF)
return sizes[(type >> 12) - 1];
/* tag with dynamic size (e.g. list): must read size */
if (!SdbpReadData(pdb, &size, tagid + sizeof(TAG), sizeof(size)))
return 0;
return size;
}
