gecko-dev/xpcom/glue/standalone/nsGlueLinkingWin.cpp

286 строки
8.2 KiB
C++

/* -*- Mode: C++; tab-width: 6; 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 XPCOM.
*
* The Initial Developer of the Original Code is
* Benjamin Smedberg <benjamin@smedbergs.us>
*
* Portions created by the Initial Developer are Copyright (C) 2005
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either 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
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsGlueLinking.h"
#include "nsXPCOMGlue.h"
#include "nsStringAPI.h"
#include <windows.h>
#include <stdlib.h>
#include <stdio.h>
#include <tchar.h>
#define MOZ_LOADLIBRARY_FLAGS LOAD_WITH_ALTERED_SEARCH_PATH
struct DependentLib
{
HINSTANCE libHandle;
DependentLib *next;
};
static DependentLib *sTop;
HINSTANCE sXULLibrary;
static void
AppendDependentLib(HINSTANCE libHandle)
{
DependentLib *d = new DependentLib;
if (!d)
return;
d->next = sTop;
d->libHandle = libHandle;
sTop = d;
}
static void
preload(LPCWSTR dll)
{
HANDLE fd = CreateFileW(dll, GENERIC_READ, FILE_SHARE_READ,
NULL, OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, NULL);
char buf[64 * 1024];
if (fd == INVALID_HANDLE_VALUE)
return;
DWORD dwBytesRead;
// Do dummy reads to trigger kernel-side readhead via FILE_FLAG_SEQUENTIAL_SCAN.
// Abort when underfilling because during testing the buffers are read fully
// A buffer that's not keeping up would imply that readahead isn't working right
while (ReadFile(fd, buf, sizeof(buf), &dwBytesRead, NULL) && dwBytesRead == sizeof(buf))
/* Nothing */;
CloseHandle(fd);
}
static void
ReadDependentCB(const char *aDependentLib, bool do_preload)
{
wchar_t wideDependentLib[MAX_PATH];
MultiByteToWideChar(CP_UTF8, 0, aDependentLib, -1, wideDependentLib, MAX_PATH);
if (do_preload)
preload(wideDependentLib);
HINSTANCE h =
LoadLibraryExW(wideDependentLib, NULL, MOZ_LOADLIBRARY_FLAGS);
if (!h)
return;
AppendDependentLib(h);
}
// like strpbrk but finds the *last* char, not the first
static char*
ns_strrpbrk(char *string, const char *strCharSet)
{
char *found = NULL;
for (; *string; ++string) {
for (const char *search = strCharSet; *search; ++search) {
if (*search == *string) {
found = string;
// Since we're looking for the last char, we save "found"
// until we're at the end of the string.
}
}
}
return found;
}
// like strpbrk but finds the *last* char, not the first
static wchar_t*
ns_wcspbrk(wchar_t *string, const wchar_t *strCharSet)
{
wchar_t *found = NULL;
for (; *string; ++string) {
for (const wchar_t *search = strCharSet; *search; ++search) {
if (*search == *string) {
found = string;
// Since we're looking for the last char, we save "found"
// until we're at the end of the string.
}
}
}
return found;
}
bool ns_isRelPath(wchar_t* path)
{
return !(path[1] == ':');
}
nsresult
XPCOMGlueLoad(const char *aXpcomFile, GetFrozenFunctionsFunc *func)
{
wchar_t xpcomFile[MAXPATHLEN];
MultiByteToWideChar(CP_UTF8, 0, aXpcomFile,-1,
xpcomFile, MAXPATHLEN);
if (xpcomFile[0] == '.' && xpcomFile[1] == '\0') {
wcscpy(xpcomFile, LXPCOM_DLL);
}
else {
wchar_t xpcomDir[MAXPATHLEN];
if (ns_isRelPath(xpcomFile))
{
_wfullpath(xpcomDir, xpcomFile, sizeof(xpcomDir)/sizeof(wchar_t));
}
else
{
wcscpy(xpcomDir, xpcomFile);
}
wchar_t *lastSlash = ns_wcspbrk(xpcomDir, L"/\\");
if (lastSlash) {
*lastSlash = '\0';
char xpcomDir_narrow[MAXPATHLEN];
WideCharToMultiByte(CP_UTF8, 0, xpcomDir,-1,
xpcomDir_narrow, MAX_PATH, NULL, NULL);
XPCOMGlueLoadDependentLibs(xpcomDir_narrow, ReadDependentCB);
_snwprintf(lastSlash, MAXPATHLEN - wcslen(xpcomDir), L"\\" LXUL_DLL);
sXULLibrary =
LoadLibraryExW(xpcomDir, NULL, MOZ_LOADLIBRARY_FLAGS);
if (!sXULLibrary)
{
DWORD err = GetLastError();
#ifdef DEBUG
LPVOID lpMsgBuf;
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &lpMsgBuf,
0,
NULL
);
wprintf(L"Error loading %s: %s\n", xpcomDir, lpMsgBuf);
LocalFree(lpMsgBuf);
#endif //DEBUG
return (err == ERROR_NOT_ENOUGH_MEMORY || err == ERROR_OUTOFMEMORY)
? NS_ERROR_OUT_OF_MEMORY : NS_ERROR_FAILURE;
}
}
}
HINSTANCE h =
LoadLibraryExW(xpcomFile, NULL, MOZ_LOADLIBRARY_FLAGS);
if (!h)
{
DWORD err = GetLastError();
#ifdef DEBUG
LPVOID lpMsgBuf;
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
err,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &lpMsgBuf,
0,
NULL
);
wprintf(L"Error loading %s: %s\n", xpcomFile, lpMsgBuf);
LocalFree(lpMsgBuf);
#endif
return (err == ERROR_NOT_ENOUGH_MEMORY || err == ERROR_OUTOFMEMORY)
? NS_ERROR_OUT_OF_MEMORY : NS_ERROR_FAILURE;
}
AppendDependentLib(h);
GetFrozenFunctionsFunc sym =
(GetFrozenFunctionsFunc) GetProcAddress(h, "NS_GetFrozenFunctions");
if (!sym) { // No symbol found.
XPCOMGlueUnload();
return NS_ERROR_NOT_AVAILABLE;
}
*func = sym;
return NS_OK;
}
void
XPCOMGlueUnload()
{
while (sTop) {
FreeLibrary(sTop->libHandle);
DependentLib *temp = sTop;
sTop = sTop->next;
delete temp;
}
if (sXULLibrary) {
FreeLibrary(sXULLibrary);
sXULLibrary = nsnull;
}
}
nsresult
XPCOMGlueLoadXULFunctions(const nsDynamicFunctionLoad *symbols)
{
if (!sXULLibrary)
return NS_ERROR_NOT_INITIALIZED;
nsresult rv = NS_OK;
while (symbols->functionName) {
*symbols->function =
(NSFuncPtr) GetProcAddress(sXULLibrary, symbols->functionName);
if (!*symbols->function)
rv = NS_ERROR_LOSS_OF_SIGNIFICANT_DATA;
++symbols;
}
return rv;
}