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https://github.com/reactos/reactos.git
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422 lines
12 KiB
C
422 lines
12 KiB
C
/*
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* PROJECT: ReactOS Application compatibility module
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* LICENSE: GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
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* PURPOSE: Shim database query functions
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* COPYRIGHT: Copyright 2011 André Hentschel
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* Copyright 2013 Mislav Blaževic
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* Copyright 2015-2018 Mark Jansen (mark.jansen@reactos.org)
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*/
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#include "windef.h"
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#include "apphelp.h"
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BOOL WINAPI SdbpReadData(PDB pdb, PVOID dest, DWORD offset, DWORD num)
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{
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DWORD size = offset + num;
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/* Either overflow or no data to read */
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if (size <= offset)
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return FALSE;
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/* Overflow */
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if (pdb->size < size)
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return FALSE;
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memcpy(dest, pdb->data + offset, num);
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return TRUE;
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}
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static DWORD WINAPI SdbpGetTagSize(PDB pdb, TAGID tagid)
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{
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WORD type;
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DWORD size;
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type = SdbGetTagFromTagID(pdb, tagid) & TAG_TYPE_MASK;
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if (type == TAG_NULL)
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return 0;
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size = SdbGetTagDataSize(pdb, tagid);
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if (type <= TAG_TYPE_STRINGREF)
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return size += sizeof(TAG);
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else size += (sizeof(TAG) + sizeof(DWORD));
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return size;
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}
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LPWSTR WINAPI SdbpGetString(PDB pdb, TAGID tagid, PDWORD size)
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{
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TAG tag;
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TAGID offset;
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tag = SdbGetTagFromTagID(pdb, tagid);
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if (tag == TAG_NULL)
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return NULL;
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if ((tag & TAG_TYPE_MASK) == TAG_TYPE_STRINGREF)
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{
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/* No stringtable; all references are invalid */
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if (pdb->stringtable == TAGID_NULL)
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return NULL;
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/* TAG_TYPE_STRINGREF contains offset of string relative to stringtable */
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if (!SdbpReadData(pdb, &tagid, tagid + sizeof(TAG), sizeof(TAGID)))
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return NULL;
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offset = pdb->stringtable + tagid + sizeof(TAG) + sizeof(TAGID);
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}
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else if ((tag & TAG_TYPE_MASK) == TAG_TYPE_STRING)
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{
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offset = tagid + sizeof(TAG) + sizeof(TAGID);
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}
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else
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{
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SHIM_ERR("Tag 0x%u at tagid %u is neither a string or reference to string\n", tag, tagid);
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return NULL;
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}
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/* Optionally read string size */
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if (size && !SdbpReadData(pdb, size, offset - sizeof(TAGID), sizeof(*size)))
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return FALSE;
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return (LPWSTR)(&pdb->data[offset]);
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}
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/**
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* Searches shim database for the tag associated with specified tagid.
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*
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* @param [in] pdb Handle to the shim database.
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* @param [in] tagid The TAGID of the tag.
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*
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* @return Success: The tag associated with specified tagid, Failure: TAG_NULL.
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*/
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TAG WINAPI SdbGetTagFromTagID(PDB pdb, TAGID tagid)
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{
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TAG data;
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if (!SdbpReadData(pdb, &data, tagid, sizeof(data)))
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return TAG_NULL;
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return data;
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}
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/**
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* Retrieves size of data at specified tagid.
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*
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* @param [in] pdb Handle to the shim database.
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* @param [in] tagid Tagid of tag whose size is queried.
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*
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* @return Success: Size of data at specified tagid, Failure: 0.
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*/
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DWORD WINAPI SdbGetTagDataSize(PDB pdb, TAGID tagid)
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{
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/* sizes of data types with fixed size */
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static const SIZE_T sizes[6] = {
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0, /* NULL */ 1, /* BYTE */
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2, /* WORD */ 4, /* DWORD */
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8, /* QWORD */ 4 /* STRINGREF */
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};
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WORD type;
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DWORD size;
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type = SdbGetTagFromTagID(pdb, tagid) & TAG_TYPE_MASK;
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if (type == TAG_NULL)
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return 0;
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if (type <= TAG_TYPE_STRINGREF)
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return sizes[(type >> 12) - 1];
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/* tag with dynamic size (e.g. list): must read size */
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if (!SdbpReadData(pdb, &size, tagid + sizeof(TAG), sizeof(size)))
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return 0;
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return size;
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}
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/**
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* Searches shim database for a child of specified parent tag.
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*
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* @param [in] pdb Handle to the shim database.
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* @param [in] parent TAGID of parent.
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*
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* @return Success: TAGID of child tag, Failure: TAGID_NULL.
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*/
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TAGID WINAPI SdbGetFirstChild(PDB pdb, TAGID parent)
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{
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/* if we are at beginning of database */
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if (parent == TAGID_ROOT)
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{
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/* header only database: no tags */
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if (pdb->size <= _TAGID_ROOT)
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return TAGID_NULL;
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/* return *real* root tagid */
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else return _TAGID_ROOT;
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}
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/* only list tag can have children */
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if ((SdbGetTagFromTagID(pdb, parent) & TAG_TYPE_MASK) != TAG_TYPE_LIST)
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return TAGID_NULL;
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/* first child is sizeof(TAG) + sizeof(DWORD) bytes after beginning of list */
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return parent + sizeof(TAG) + sizeof(DWORD);
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}
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/**
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* Searches shim database for next child of specified parent tag.
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*
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* @param [in] pdb Handle to the shim database.
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* @param [in] parent TAGID of parent.
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* @param [in] prev_child TAGID of previous child.
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*
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* @return Success: TAGID of next child tag, Failure: TAGID_NULL.
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*/
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TAGID WINAPI SdbGetNextChild(PDB pdb, TAGID parent, TAGID prev_child)
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{
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TAGID next_child;
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DWORD prev_child_size, parent_size;
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prev_child_size = SdbpGetTagSize(pdb, prev_child);
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if (prev_child_size == 0)
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return TAGID_NULL;
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/* Bound check */
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next_child = prev_child + prev_child_size;
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if (next_child >= pdb->size)
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return TAGID_NULL;
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if (parent == TAGID_ROOT)
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return next_child;
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parent_size = SdbpGetTagSize(pdb, parent);
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if (parent_size == 0)
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return TAGID_NULL;
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/* Specified parent has no more children */
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if (next_child >= parent + parent_size)
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return TAGID_NULL;
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return next_child;
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}
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/**
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* Searches shim database for a tag within specified domain.
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*
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* @param [in] pdb Handle to the shim database.
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* @param [in] parent TAGID of parent.
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* @param [in] tag TAG to be located.
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*
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* @return Success: TAGID of first matching tag, Failure: TAGID_NULL.
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*/
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TAGID WINAPI SdbFindFirstTag(PDB pdb, TAGID parent, TAG tag)
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{
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TAGID iter;
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iter = SdbGetFirstChild(pdb, parent);
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while (iter != TAGID_NULL)
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{
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if (SdbGetTagFromTagID(pdb, iter) == tag)
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return iter;
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iter = SdbGetNextChild(pdb, parent, iter);
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}
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return TAGID_NULL;
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}
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/**
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* Searches shim database for a next tag which matches prev_child within parent's domain.
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*
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* @param [in] pdb Handle to the shim database.
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* @param [in] parent TAGID of parent.
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* @param [in] prev_child TAGID of previous match.
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*
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* @return Success: TAGID of next match, Failure: TAGID_NULL.
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*/
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TAGID WINAPI SdbFindNextTag(PDB pdb, TAGID parent, TAGID prev_child)
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{
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TAG tag;
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TAGID iter;
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tag = SdbGetTagFromTagID(pdb, prev_child);
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iter = SdbGetNextChild(pdb, parent, prev_child);
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while (iter != TAGID_NULL)
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{
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if (SdbGetTagFromTagID(pdb, iter) == tag)
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return iter;
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iter = SdbGetNextChild(pdb, parent, iter);
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}
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return TAGID_NULL;
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}
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/**
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* Searches shim database for string associated with specified tagid and copies string into a
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* buffer.
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*
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* If size parameter is less than number of characters in string, this function shall fail and
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* no data shall be copied.
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*
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* @param [in] pdb Handle to the shim database.
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* @param [in] tagid TAGID of string or stringref associated with the string.
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* @param [out] buffer Buffer in which string will be copied.
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* @param [in] size Number of characters to copy.
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*
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* @return TRUE if string was successfully copied to the buffer FALSE if string was not copied
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* to the buffer.
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*/
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BOOL WINAPI SdbReadStringTag(PDB pdb, TAGID tagid, LPWSTR buffer, DWORD size)
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{
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LPWSTR string;
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DWORD string_size;
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string = SdbpGetString(pdb, tagid, &string_size);
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if (!string)
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return FALSE;
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/* Check if buffer is too small */
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if (size * sizeof(WCHAR) < string_size)
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return FALSE;
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memcpy(buffer, string, string_size);
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return TRUE;
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}
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/**
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* Reads WORD value at specified tagid.
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*
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* @param [in] pdb Handle to the shim database.
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* @param [in] tagid TAGID of WORD value.
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* @param [in] ret Default return value in case function fails.
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*
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* @return Success: WORD value at specified tagid, or ret on failure.
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*/
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WORD WINAPI SdbReadWORDTag(PDB pdb, TAGID tagid, WORD ret)
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{
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if (SdbpCheckTagIDType(pdb, tagid, TAG_TYPE_WORD))
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SdbpReadData(pdb, &ret, tagid + 2, sizeof(WORD));
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return ret;
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}
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/**
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* Reads DWORD value at specified tagid.
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*
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* @param [in] pdb Handle to the shim database.
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* @param [in] tagid TAGID of DWORD value.
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* @param [in] ret Default return value in case function fails.
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*
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* @return Success: DWORD value at specified tagid, otherwise ret.
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*/
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DWORD WINAPI SdbReadDWORDTag(PDB pdb, TAGID tagid, DWORD ret)
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{
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if (SdbpCheckTagIDType(pdb, tagid, TAG_TYPE_DWORD))
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SdbpReadData(pdb, &ret, tagid + 2, sizeof(DWORD));
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return ret;
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}
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/**
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* Reads QWORD value at specified tagid.
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*
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* @param [in] pdb Handle to the shim database.
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* @param [in] tagid TAGID of QWORD value.
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* @param [in] ret Default return value in case function fails.
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*
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* @return Success: QWORD value at specified tagid, otherwise ret.
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*/
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QWORD WINAPI SdbReadQWORDTag(PDB pdb, TAGID tagid, QWORD ret)
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{
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if (SdbpCheckTagIDType(pdb, tagid, TAG_TYPE_QWORD))
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SdbpReadData(pdb, &ret, tagid + sizeof(TAG), sizeof(QWORD));
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return ret;
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}
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/**
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* Reads binary data at specified tagid.
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*
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* @param [in] pdb Handle to the shim database.
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* @param [in] tagid TAGID of binary data.
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* @param [out] buffer Buffer in which data will be copied.
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* @param [in] size Size of the buffer.
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*
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* @return TRUE if data was successfully written, or FALSE otherwise.
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*/
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BOOL WINAPI SdbReadBinaryTag(PDB pdb, TAGID tagid, PBYTE buffer, DWORD size)
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{
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DWORD data_size = 0;
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if (SdbpCheckTagIDType(pdb, tagid, TAG_TYPE_BINARY))
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{
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SdbpReadData(pdb, &data_size, tagid + sizeof(TAG), sizeof(data_size));
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if (size >= data_size)
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return SdbpReadData(pdb, buffer, tagid + sizeof(TAG) + sizeof(data_size), data_size);
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}
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return FALSE;
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}
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/**
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* Retrieves binary data at specified tagid.
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*
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* @param [in] pdb Handle to the shim database.
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* @param [in] tagid TAGID of binary data.
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*
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* @return Success: Pointer to binary data at specified tagid, or NULL on failure.
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*/
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PVOID WINAPI SdbGetBinaryTagData(PDB pdb, TAGID tagid)
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{
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if (!SdbpCheckTagIDType(pdb, tagid, TAG_TYPE_BINARY))
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return NULL;
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return &pdb->data[tagid + sizeof(TAG) + sizeof(DWORD)];
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}
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/**
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* Searches shim database for string associated with specified tagid.
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*
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* @param [in] pdb Handle to the shim database.
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* @param [in] tagid TAGID of string or stringref associated with the string.
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*
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* @return the LPWSTR associated with specified tagid, or NULL on failure.
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*/
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LPWSTR WINAPI SdbGetStringTagPtr(PDB pdb, TAGID tagid)
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{
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return SdbpGetString(pdb, tagid, NULL);
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}
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/**
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* Reads binary data at specified tagid.
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*
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* @param [in] pdb Handle to the shim database.
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* @param [out] Guid Database ID.
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*
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* @return true if the ID was found FALSE otherwise.
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*/
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BOOL WINAPI SdbGetDatabaseID(PDB pdb, GUID* Guid)
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{
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if(SdbIsNullGUID(&pdb->database_id))
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{
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TAGID root = SdbFindFirstTag(pdb, TAGID_ROOT, TAG_DATABASE);
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if(root != TAGID_NULL)
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{
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TAGID id = SdbFindFirstTag(pdb, root, TAG_DATABASE_ID);
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if(id != TAGID_NULL)
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{
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if(!SdbReadBinaryTag(pdb, id, (PBYTE)&pdb->database_id, sizeof(pdb->database_id)))
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{
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memset(&pdb->database_id, 0, sizeof(pdb->database_id));
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}
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}
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else
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{
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/* Should we silence this if we are opening a system db? */
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SHIM_ERR("Failed to get the database id\n");
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}
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}
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else
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{
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/* Should we silence this if we are opening a system db? */
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SHIM_ERR("Failed to get root tag\n");
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}
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}
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if(!SdbIsNullGUID(&pdb->database_id))
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{
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memcpy(Guid, &pdb->database_id, sizeof(pdb->database_id));
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return TRUE;
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}
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return FALSE;
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}
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