gecko-dev/xpcom/components/xcDll.cpp

172 строки
3.7 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
/* nsDll
*
* Abstraction of a Dll. Stores modifiedTime and size for easy detection of
* change in dll.
*
* dp Suresh <dp@netscape.com>
*/
#include "xcDll.h"
#include "plstr.h" // strdup and strfree
nsDll::nsDll(const char *libFullPath) : m_fullpath(NULL), m_instance(NULL),
m_status(DLL_OK)
{
m_lastModTime = LL_ZERO;
m_size = 0;
if (libFullPath == NULL)
{
m_status = DLL_INVALID_PARAM;
return;
}
m_fullpath = PL_strdup(libFullPath);
if (m_fullpath == NULL)
{
// No more memory
m_status = DLL_NO_MEM;
return;
}
PRFileInfo statinfo;
if (PR_GetFileInfo(m_fullpath, &statinfo) != PR_SUCCESS)
{
// The stat things works only if people pass in the full pathname.
// Even if our stat fails, we could be able to load it because of
// LD_LIBRARY_PATH and other such paths where dlls are searched for
// XXX we need a way of marking this occurance.
// XXX m_status = DLL_STAT_ERROR;
}
else
{
m_size = statinfo.size;
m_lastModTime = statinfo.modifyTime;
if (statinfo.type != PR_FILE_FILE)
{
// Not a file. Cant work with it.
m_status = DLL_NOT_FILE;
return;
}
}
m_status = DLL_OK;
}
nsDll::nsDll(const char *libFullPath, PRTime lastModTime, PRUint32 fileSize)
: m_fullpath(NULL), m_instance(NULL), m_status(DLL_OK)
{
m_lastModTime = lastModTime;
m_size = fileSize;
if (libFullPath == NULL)
{
m_status = DLL_INVALID_PARAM;
return;
}
m_fullpath = PL_strdup(libFullPath);
if (m_fullpath == NULL)
{
// No more memory
m_status = DLL_NO_MEM;
return;
}
m_status = DLL_OK;
}
nsDll::~nsDll(void)
{
if (m_instance != NULL)
Unload();
if (m_fullpath != NULL) PL_strfree(m_fullpath);
m_fullpath = NULL;
}
PRBool nsDll::Load(void)
{
if (m_status != DLL_OK)
{
return (PR_FALSE);
}
if (m_instance != NULL)
{
// Already loaded
return (PR_TRUE);
}
#ifdef XP_MAC
// err = ConvertUnixPathToMacPath(m_fullpath, &macFileName);
char *macFileName = PL_strdup(m_fullpath);
if (macFileName != NULL)
{
if (macFileName[0] == '/')
{
// convert '/' to ':'
int c;
char* str = macFileName;
while ((c = *str++) != 0)
{
if (c == '/')
str[-1] = ':';
}
m_instance = PR_LoadLibrary(&macFileName[1]); // skip over initial slash
}
else
{
m_instance = PR_LoadLibrary(macFileName);
}
PL_strfree(macFileName);
}
#else
// This is the only right way of doing this...
m_instance = PR_LoadLibrary(m_fullpath);
#endif /* XP_MAC */
return ((m_instance == NULL) ? PR_FALSE : PR_TRUE);
}
PRBool nsDll::Unload(void)
{
if (m_status != DLL_OK || m_instance == NULL)
return (PR_FALSE);
PRStatus ret = PR_UnloadLibrary(m_instance);
if (ret == PR_SUCCESS)
{
m_instance = NULL;
return (PR_TRUE);
}
else
return (PR_FALSE);
}
void * nsDll::FindSymbol(const char *symbol)
{
if (symbol == NULL)
return (NULL);
// If not already loaded, load it now.
if (Load() != PR_TRUE)
return (NULL);
return (PR_FindSymbol(m_instance, symbol));
}