/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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#include "nscore.h"
#include "nsString.h"
#include "MapiMimeTypes.h"

PRUint8 CMimeTypes::m_mimeBuffer[kMaxMimeTypeSize];


BOOL CMimeTypes::GetKey( HKEY root, LPCTSTR pName, PHKEY pKey)
{
  LONG result = RegOpenKeyEx( root, pName, 0, KEY_QUERY_VALUE | KEY_ENUMERATE_SUB_KEYS, pKey);
  return (result == ERROR_SUCCESS);
}

BOOL CMimeTypes::GetValueBytes( HKEY rootKey, LPCTSTR pValName, LPBYTE *ppBytes)
{
  LONG  err;
  DWORD  bufSz;

  *ppBytes = NULL;
  // Get the installed directory
  err = RegQueryValueEx( rootKey, pValName, NULL, NULL, NULL, &bufSz);
  if (err == ERROR_SUCCESS) {
    *ppBytes = new BYTE[bufSz];
    err = RegQueryValueEx( rootKey, pValName, NULL, NULL, *ppBytes, &bufSz);
    if (err == ERROR_SUCCESS) {
      return( TRUE);
    }
    delete *ppBytes;
    *ppBytes = NULL;
  }
  return( FALSE);
}

void CMimeTypes::ReleaseValueBytes( LPBYTE pBytes)
{
  if (pBytes)
    delete pBytes;
}

BOOL CMimeTypes::GetMimeTypeFromReg( const nsCString& ext, LPBYTE *ppBytes)
{
  HKEY  extensionKey;
  BOOL  result = FALSE;
  *ppBytes = NULL;
  if (GetKey( HKEY_CLASSES_ROOT, ext.get(), &extensionKey)) {
    result = GetValueBytes( extensionKey, "Content Type", ppBytes);
    RegCloseKey( extensionKey);
  }

  return( result);
}

PRUint8 * CMimeTypes::GetMimeType(const nsString& theExt)
{
  nsCString ext;
  LossyCopyUTF16toASCII(theExt, ext);
  return GetMimeType(ext);
}

PRUint8 * CMimeTypes::GetMimeType(const nsCString& theExt)
{
  nsCString  ext = theExt;
  if (ext.Length()) {
    if (ext.First() != '.') {
      ext = ".";
      ext += theExt;
    }
  }


  BOOL  result = FALSE;
  int    len;

  if (!ext.Length())
    return( NULL);
  LPBYTE  pByte;
  if (GetMimeTypeFromReg( ext, &pByte)) {
    len = strlen( (const char *) pByte);
    if (len && (len < kMaxMimeTypeSize)) {
      memcpy( m_mimeBuffer, pByte, len);
      m_mimeBuffer[len] = 0;
      result = TRUE;
    }
    ReleaseValueBytes( pByte);
  }

  if (result)
    return( m_mimeBuffer);

  return( NULL);
}
