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/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** No Commercial Usage
**
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
**
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**************************************************************************/
#include <cstdio>
#include <cstring>
#include <locale>
#include <qglobal.h>
#include "binpatch.h"
#ifdef Q_OS_WIN
# define strcasecmp _stricmp
# define strncasecmp _strnicmp
#endif
// returns positive value if it finds a null termination inside the buffer
long BinPatch::getBufferStringLength(char *data, char *end)
{
long size = 0;
while (data < end) {
if (*data == '\0')
return size;
++data;
++size;
}
return -1;
}
// returns true if data ends with one of the tokens. (Sep. with ;)
bool BinPatch::endsWithTokens(const char *data)
{
if(strlen(endTokens) > 0) {
char endstmp[1024];
ulong tlen = ulong(strlen(data));
if(strlen(endTokens) >= sizeof(endstmp))
return false;
strcpy(endstmp, endTokens);
char *token = strtok(endstmp, ";");
while(token != NULL) {
// check if it ends with the token
if ((tlen >= strlen(token))
&& (strcasecmp((data+tlen)-strlen(token), token) == 0))
return true;
token = strtok(NULL, ";");
}
} else {
return true; //true if no tokens
}
return false; //no matching tokens
}
bool BinPatch::patchHelper(char *inbuffer, const char *oldstr, const char *newstr, size_t len, long *rw)
{
char nc1 = *oldstr;
char nc2 = 0;
char *inend = inbuffer + len;
size_t oldlen = strlen(oldstr);
size_t newlen = strlen(newstr);
char *instart = inbuffer;
*rw = 0;
bool write = true;
isupper(nc1) ? nc2 = tolower(nc1) : nc2 = toupper(nc1);
while(inbuffer < inend) {
if ((*inbuffer == nc1) || (*inbuffer == nc2)) {
if (inbuffer > (inend-oldlen) || inbuffer > (inend-newlen)) {
*rw = (long)(inend-inbuffer); //rewind, not enough to make a compare
break;
}
if (strncasecmp(inbuffer, oldstr, oldlen) == 0) {
if (useLength && (instart == inbuffer)) {
*rw = (long)(len+1); //we don't have access to the length byte, rewind all + 1!
write = false;
break;
}
long oldsize = -1;
if (useLength) { //VC60
oldsize = (unsigned char)(*(inbuffer-1));
// vc60 pdb files sometimes uses 0A, then it should be null terminated
if (oldsize < (long)oldlen) {
if (oldsize != 0x0A) { //strange case... skip
inbuffer+=oldlen;
continue;
}
oldsize = getBufferStringLength(inbuffer, inend);
if (oldsize < 0) {
*rw = (long)(inend-inbuffer); //rewind, entire string not in buffer
break;
}
}
if (inbuffer > (inend-oldsize)) {
*rw = (long)(inend-inbuffer); //rewind, entire string not in buffer
break;
}
} else { //VC7x
oldsize = getBufferStringLength(inbuffer, inend);
if (oldsize < 0) {
*rw = (long)(inend-inbuffer); //rewind, entire string not in buffer
break;
}
}
char oldPath[1024];
if (oldsize > (long)sizeof(oldPath)) {
//at least don't crash
inbuffer+=oldsize;
continue;
}
memset(oldPath, '\0', sizeof(oldPath));
strncpy(oldPath, newstr, newlen);
if (insertReplace)
strncat(oldPath, inbuffer+oldlen, oldsize-oldlen);
// just replace if it ends with a token in endTokens
if (endsWithTokens(oldPath)) {
if (oldsize < (long)strlen(oldPath))
oldsize = (long)strlen(oldPath);
memcpy(inbuffer, oldPath, oldsize);
}
inbuffer+=oldsize;
continue;
}
}
++inbuffer;
}
return write;
}
bool BinPatch::patch(const char *oldstr, const char *newstr)
{
size_t oldlen = strlen(oldstr);
size_t newlen = strlen(newstr);
if ((!fileName || strlen(fileName) < 1)
|| (!oldstr || oldlen < 1)
|| (!newstr || newlen < 1))
return false;
FILE *input;
if (!(input = fopen(fileName, "r+b")))
{
fprintf(stderr, "Warning: Could not open file %s\n", fileName);
return false;
}
char data[60000];
long rw = 0;
long offset = 0;
size_t len;
len = fread(data, sizeof(char), sizeof(data), input);
do {
if (patchHelper(data, oldstr, newstr, len, &rw)) {
fseek(input, offset, SEEK_SET); //overwrite
fwrite(data, sizeof(char), len, input);
}
offset += (long)((-rw) + len);
if (fseek(input, offset, SEEK_SET) != 0)
break;
len = fread(data, sizeof(char), sizeof(data), input);
} while(!(feof(input) && (len <= oldlen || len <= newlen)));
fclose(input);
return true;
}
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