//
// Lookups an entry based on url string key.
// If exists, locks the entry and hands out a managed handle representing a locked entry.
//
unsafe internal static SafeUnlockUrlCacheEntryFile LookupFile(Entry entry)
{
byte[] buffer = new byte[Entry.DefaultBufferSize];
int size = buffer.Length;
SafeUnlockUrlCacheEntryFile handle = null;
try {
while (true)
{
fixed(byte *entryPtr = buffer)
{
//We may need to adjust the buffer size
entry.Error = SafeUnlockUrlCacheEntryFile.GetAndLockFile(entry.Key, entryPtr, ref size, out handle);
if (entry.Error == Status.Success)
{
entry.MaxBufferBytes = size;
EntryFixup(entry, (EntryBuffer *)entryPtr, buffer);
//The method is available in TRAVE
return(handle);
}
if (entry.Error == Status.InsufficientBuffer)
{
if (size <= entry.MaxBufferBytes)
{
buffer = new byte[size];
continue;
}
}
//some error has occured
break;
}
}
}
catch (Exception e) {
if (handle != null)
{
handle.Close();
}
if (e is ThreadAbortException || e is StackOverflowException || e is OutOfMemoryException)
{
throw;
}
if (entry.Error == Status.Success)
{
entry.Error = Status.InternalError;
}
}
return(null);
}
internal static unsafe SafeUnlockUrlCacheEntryFile LookupFile(Entry entry)
{
byte[] buffer = new byte[0x800];
int length = buffer.Length;
SafeUnlockUrlCacheEntryFile handle = null;
try
{
try
{
Label_0011:
fixed(byte *numRef = buffer)
{
entry.Error = SafeUnlockUrlCacheEntryFile.GetAndLockFile(entry.Key, numRef, ref length, out handle);
if (entry.Error == Status.Success)
{
entry.MaxBufferBytes = length;
EntryFixup(entry, (EntryBuffer *)numRef, buffer);
return(handle);
}
if ((entry.Error == Status.InsufficientBuffer) && (length <= entry.MaxBufferBytes))
{
buffer = new byte[length];
goto Label_0011;
}
}
}
finally
{
numRef = null;
}
}
catch (Exception exception)
{
if (handle != null)
{
handle.Close();
}
if (((exception is ThreadAbortException) || (exception is StackOverflowException)) || (exception is OutOfMemoryException))
{
throw;
}
if (entry.Error == Status.Success)
{
entry.Error = Status.InternalError;
}
}
return(null);
}
//
// Updates a Cached Entry metadata according to attibutes flags.
//
internal static Status Update(Entry newEntry, Entry_FC attributes)
{
// Currently WinInet does not support headers update,
// hence don't need space for them although we'll need recreate a cache entry
// if headers update is requested
byte[] buffer = new byte[EntryBuffer.MarshalSize];
newEntry.Error = Status.Success;
unsafe
{
fixed(byte *bytePtr = buffer)
{
EntryBuffer *ePtr = (EntryBuffer *)bytePtr;
*ePtr = newEntry.Info;
//set the version just in case
ePtr->StructSize = EntryBuffer.MarshalSize;
if ((attributes & Entry_FC.Headerinfo) == 0)
{
if (!UnsafeNclNativeMethods.UnsafeWinInetCache.SetUrlCacheEntryInfoW(newEntry.Key, bytePtr, attributes))
{
newEntry.Error = (Status)Marshal.GetLastWin32Error();
}
}
else
{
// simulating headers update using Edited cache entry feature of WinInet
Entry oldEntry = new Entry(newEntry.Key, newEntry.MaxBufferBytes);
SafeUnlockUrlCacheEntryFile handle = null;
bool wasEdited = false;
try {
// lock the entry and get the filename out.
handle = LookupFile(oldEntry);
if (handle == null)
{
//The same error would happen on update attributes, return it.
newEntry.Error = oldEntry.Error;
return(newEntry.Error);
}
//Copy strings from old entry that are not present in the method parameters
newEntry.Filename = oldEntry.Filename;
newEntry.OriginalUrl = oldEntry.OriginalUrl;
newEntry.FileExt = oldEntry.FileExt;
// We don't need to update this and some other attributes since will replace entire entry
attributes &= ~Entry_FC.Headerinfo;
//Copy attributes from an old entry that are not present in the method parameters
if ((attributes & Entry_FC.Exptime) == 0)
{
newEntry.Info.ExpireTime = oldEntry.Info.ExpireTime;
}
if ((attributes & Entry_FC.Modtime) == 0)
{
newEntry.Info.LastModifiedTime = oldEntry.Info.LastModifiedTime;
}
if ((attributes & Entry_FC.Attribute) == 0)
{
newEntry.Info.EntryType = oldEntry.Info.EntryType;
newEntry.Info.U.ExemptDelta = oldEntry.Info.U.ExemptDelta;
if ((oldEntry.Info.EntryType & EntryType.StickyEntry) == EntryType.StickyEntry)
{
attributes |= (Entry_FC.Attribute | Entry_FC.ExemptDelta);
}
}
// Those attributes will be taken care of by Commit()
attributes &= ~(Entry_FC.Exptime | Entry_FC.Modtime);
wasEdited = (oldEntry.Info.EntryType & EntryType.Edited) != 0;
if (!wasEdited)
{
// Prevent the file from being deleted on entry Remove (kinda hack)
oldEntry.Info.EntryType |= EntryType.Edited;
// Recursion!
if (Update(oldEntry, Entry_FC.Attribute) != Status.Success)
{
newEntry.Error = oldEntry.Error;
return(newEntry.Error);
}
}
}
finally {
if (handle != null)
{
handle.Close();
}
}
// At this point we try to delete the exisintg item and create a new one with the same
// filename and the new headers.
//We wish to ignore any errors from Remove since are going to replace the entry.
Remove(oldEntry);
if (Commit(newEntry) != Status.Success)
{
if (!wasEdited)
{
//revert back the original entry type
oldEntry.Info.EntryType &= ~EntryType.Edited;
Update(oldEntry, Entry_FC.Attribute);
// Being already in error mode, cannot do much if Update fails.
}
return(newEntry.Error);
}
// Now see what's left in attributes change request.
if (attributes != Entry_FC.None)
{
Update(newEntry, attributes);
}
//At this point newEntry.Error should contain the resulting status
//and we replaced the entry in the cache with the same body
//but different headers. Some more attributes may have changed as well.
}
}
}
return(newEntry.Error);
}
internal static unsafe Status Update(Entry newEntry, Entry_FC attributes)
{
byte[] buffer = new byte[EntryBuffer.MarshalSize];
newEntry.Error = Status.Success;
fixed(byte *numRef = buffer)
{
EntryBuffer *bufferPtr = (EntryBuffer *)numRef;
bufferPtr[0] = newEntry.Info;
bufferPtr->StructSize = EntryBuffer.MarshalSize;
if ((attributes & Entry_FC.Headerinfo) == Entry_FC.None)
{
if (!UnsafeNclNativeMethods.UnsafeWinInetCache.SetUrlCacheEntryInfoW(newEntry.Key, numRef, attributes))
{
newEntry.Error = (Status)Marshal.GetLastWin32Error();
}
}
else
{
Entry entry = new Entry(newEntry.Key, newEntry.MaxBufferBytes);
SafeUnlockUrlCacheEntryFile file = null;
bool flag = false;
try
{
file = LookupFile(entry);
if (file == null)
{
newEntry.Error = entry.Error;
return(newEntry.Error);
}
newEntry.Filename = entry.Filename;
newEntry.OriginalUrl = entry.OriginalUrl;
newEntry.FileExt = entry.FileExt;
attributes &= ~Entry_FC.Headerinfo;
if ((attributes & Entry_FC.Exptime) == Entry_FC.None)
{
newEntry.Info.ExpireTime = entry.Info.ExpireTime;
}
if ((attributes & Entry_FC.Modtime) == Entry_FC.None)
{
newEntry.Info.LastModifiedTime = entry.Info.LastModifiedTime;
}
if ((attributes & Entry_FC.Attribute) == Entry_FC.None)
{
newEntry.Info.EntryType = entry.Info.EntryType;
newEntry.Info.U.ExemptDelta = entry.Info.U.ExemptDelta;
if ((entry.Info.EntryType & EntryType.StickyEntry) == EntryType.StickyEntry)
{
attributes |= Entry_FC.ExemptDelta | Entry_FC.Attribute;
}
}
attributes &= ~(Entry_FC.Exptime | Entry_FC.Modtime);
flag = (entry.Info.EntryType & EntryType.Edited) != 0;
if (!flag)
{
entry.Info.EntryType |= EntryType.Edited;
if (Update(entry, Entry_FC.Attribute) != Status.Success)
{
newEntry.Error = entry.Error;
return(newEntry.Error);
}
}
}
finally
{
if (file != null)
{
file.Close();
}
}
Remove(entry);
if (Commit(newEntry) != Status.Success)
{
if (!flag)
{
entry.Info.EntryType &= ~EntryType.Edited;
Update(entry, Entry_FC.Attribute);
}
return(newEntry.Error);
}
if (attributes != Entry_FC.None)
{
Update(newEntry, attributes);
}
}
}
return(newEntry.Error);
}
