/* resolve a particular object from the archive */
public bool ResolveObject(string objPath, ref ChmUnitInfo ui)
{
/*
* XXX: implement caching scheme for dir pages
*/
Int32 curPage;
/* buffer to hold whatever page we're looking at */
/* RWE 6/12/2003 */
byte[] page_buf = new byte[_h.block_len];
/* starting page */
curPage = _h.index_root;
/* until we have either returned or given up */
while (curPage != -1)
{
/* try to fetch the index page */
if (Storage.FetchBytes(ref _h, ref page_buf,
(UInt64)_h.dir_offset + (UInt64)curPage * _h.block_len,
_h.block_len) != _h.block_len)
{
return(false);
}
/* now, if it is a leaf node: */
if (ASCIIEncoding.UTF8.GetString(page_buf, 0, 4).CompareTo(Pmgl.CHM_PMGL_MARKER) == 0)
{
/* scan block */
long pEntry = Pmgl.FindInPmgl(page_buf, _h.block_len, objPath);
if (pEntry < 0)
{
return(false);
}
/* parse entry and return */
uint os = (uint)pEntry;
Pmgl.ParsePgmlEntry(page_buf, ref os, ref ui);
return(true);
}
/* else, if it is a branch node: */
else if (ASCIIEncoding.UTF8.GetString(page_buf, 0, 4).CompareTo(Pmgi.CHM_PMGI_MARKER) == 0)
{
curPage = Pmgi.FindInPmgi(page_buf, _h.block_len, objPath);
}
/* else, we are confused. give up. */
else
{
return(false);
}
}
/* didn't find anything. fail. */
return(false);
}
/* find an exact entry in PMGL; return NULL if we fail */
public static long FindInPmgl(byte[] page_buf, UInt32 block_len, string objPath)
{
/* XXX: modify this to do a binary search using the nice index structure
* that is provided for us.
*/
chmPmglHeader header = new chmPmglHeader();
uint hremain;
uint end;
uint cur;
uint temp;
UInt64 strLen;
char[] buffer = new char[Storage.CHM_MAX_PATHLEN];
/* figure out where to start and end */
cur = 0;
hremain = CHM_PMGL_LEN;
if (!UnmarshalPmglHeader(ref page_buf, ref cur, ref hremain, ref header))
{
return(-1);
}
end = block_len - (header.free_space);
/* now, scan progressively */
while (cur < end)
{
/* grab the name */
temp = cur;
strLen = Storage.ParseCWord(page_buf, ref cur);
if (strLen > Storage.CHM_MAX_PATHLEN)
{
return(-1);
}
if (!Storage.ParseUTF8(page_buf, ref cur, strLen, ref buffer))
{
return(-1);
}
/* check if it is the right name */
if (Pmgi.strcasecmp(new String(buffer), objPath) == 0)
{
return((long)temp);
}
SkipPmglEntryData(page_buf, ref cur);
}
return(-1);
}
