/* find which block should be searched next for the entry; -1 if no block */
public static Int32 FindInPmgi(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
*/
chmPmgiHeader header = new chmPmgiHeader();
uint hremain;
int page = -1;
uint end;
uint cur;
UInt64 strLen;
char[] buffer = new char[Storage.CHM_MAX_PATHLEN];
/* figure out where to start and end */
cur = 0;
hremain = CHM_PMGI_LEN;
if (!UnmarshalPmgiHeader(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 */
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 (strcasecmp(new String(buffer), objPath) > 0)
{
return(page);
}
/* load next value for path */
page = (int)Storage.ParseCWord(page_buf, ref cur);
}
return(page);
}
public static bool UnmarshalPmgiHeader(ref byte[] pData, ref uint pDataPos,
ref uint pDataLen, ref chmPmgiHeader dest)
{
/* we only know how to deal with a 0x8 byte structures */
if (pDataLen != CHM_PMGI_LEN)
return false;
InitialisePmgiHeader(ref dest);
/* unmarshal fields */
Unmarshal.ToCharArray(ref pData, ref pDataPos, ref pDataLen, ref dest.signature, 4);
Unmarshal.ToUInt32(ref pData, ref pDataPos, ref pDataLen, ref dest.free_space);
/* check structure */
if (new String(dest.signature, 0, 4).CompareTo(CHM_PMGI_MARKER) != 0)
return false;
return true;
}
/* find which block should be searched next for the entry; -1 if no block */
public static Int32 FindInPmgi(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
*/
chmPmgiHeader header = new chmPmgiHeader();
uint hremain;
int page = -1;
uint end;
uint cur;
UInt64 strLen;
char[] buffer = new char[Storage.CHM_MAX_PATHLEN];
/* figure out where to start and end */
cur = 0;
hremain = CHM_PMGI_LEN;
if (!UnmarshalPmgiHeader(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 */
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 (String.Compare(new String(buffer), objPath, true) == 0)
return page;
/* load next value for path */
page = (int)Storage.ParseCWord(page_buf, ref cur);
}
return page;
}
public static bool UnmarshalPmgiHeader(ref byte[] pData, ref uint pDataPos,
ref uint pDataLen, ref chmPmgiHeader dest)
{
/* we only know how to deal with a 0x8 byte structures */
if (pDataLen != CHM_PMGI_LEN)
{
return(false);
}
InitialisePmgiHeader(ref dest);
/* unmarshal fields */
Unmarshal.ToCharArray(ref pData, ref pDataPos, ref pDataLen, ref dest.signature, 4);
Unmarshal.ToUInt32(ref pData, ref pDataPos, ref pDataLen, ref dest.free_space);
/* check structure */
if (new String(dest.signature, 0, 4).CompareTo(CHM_PMGI_MARKER) != 0)
{
return(false);
}
return(true);
}
public static void InitialisePmgiHeader(ref chmPmgiHeader dest)
{
dest.signature = new char[4];
}
public static void InitialisePmgiHeader(ref chmPmgiHeader dest)
{
dest.signature = new char[4];
}
