applied changes from 0.3pre6 (patch from rev40 to rev49)

git-svn-id: https://clonekeenplus.svn.sourceforge.net/svnroot/clonekeenplus/cgenius/trunk@79 4df4b0f3-56ce-47cb-b001-ed939b7d65a6

src/fileio/CPatcher.cpp

@@ -0,0 +1,182 @@
+/*
+ * CPatcher.cpp
+ *
+ *  Created on: 19.07.2009
+ *      Author: gerstrong
+ */
+
+#include "CPatcher.h"
+#include <dirent.h>
+#include <string.h>
+#include <fstream>
+
+CPatcher::CPatcher(int episode, int version,unsigned char *data, char *datadir) {
+	m_episode = episode;
+	m_version = version;
+	m_data = data;
+	strcpy(m_datadirectory, datadir);
+}
+
+CPatcher::~CPatcher() {
+	while(!m_TextList.empty())
+	{
+		delete *(m_TextList.begin());
+		m_TextList.pop_front();
+	}
+}
+
+void CPatcher::patchMemory()
+{
+	if(!loadPatchfile()) return;
+
+	// If the file was found and read into the m_TextList,
+	// then read out of the list the patch commands and apply them to the
+	// Exe-file data m_data
+
+	// change to the proper directory
+	chdir("data");
+	chdir(m_datadirectory);
+
+	// TODO: Extend this part further with more commands
+	while(!m_TextList.empty())
+	{
+		char line[256];
+
+		strcpy(line,*(m_TextList.begin()));
+
+		if(strncmp(line,"\%version",strlen("\%version")) == 0)
+		{
+			char *verstring;
+			char detected_version[5];
+
+			verstring = line + strlen("\%version");
+
+			sscanf(verstring,"%s",detected_version);
+
+			if((!strcmp(detected_version,"1.31") && m_version == 131 )
+				|| (!strcmp(detected_version,"1.1") && m_version == 110 )
+				|| !strcmp(detected_version,"ALL"))
+			{
+				while(!m_TextList.empty())
+				{
+					// Get the next line
+					strcpy(line,*(m_TextList.begin()));
+
+					// Now we really start to process the commands
+					if( strncmp(line,"\%patchfile",strlen("\%patchfile")) == 0 )
+					{
+						unsigned long offset;
+						char *newbuf;
+						char patch_file_name[256];
+						newbuf = line + strlen("\%patchfile");
+						sscanf(newbuf,"%lx %s",&offset,patch_file_name); // Only hexadecimal numbers supported
+						patchMemfromFile((const char*)patch_file_name,offset);
+					}
+
+					if(!m_TextList.empty())
+					{
+						delete *(m_TextList.begin());
+						m_TextList.pop_front();
+					}
+				}
+			}
+		}
+
+		if(!m_TextList.empty())
+		{
+			delete *(m_TextList.begin());
+			m_TextList.pop_front();
+		}
+	}
+
+	// change back to "data" dir
+	char curdir[256];
+	while(1)
+	{
+		char *reldir;
+		getcwd(curdir,256);
+		reldir = curdir+strlen(curdir)-strlen("data");
+		if(strcmp(reldir,"data"))
+			chdir("..");
+		else
+			break;
+	}
+	chdir("..");
+}
+
+bool CPatcher::loadPatchfile()
+{
+	bool ret = false;
+	chdir("data");
+	chdir(m_datadirectory);
+	// Detect the patchfile
+	DIR *dir = opendir(".");
+	struct dirent *dp;
+
+	if(dir)
+	{
+		while( ( dp = readdir(dir) ) )
+		{
+			if(strstr(dp->d_name,".pat"))
+			{
+				// The file was found! now read it into the memory!
+
+				char* buf;
+				ifstream Patchfile(dp->d_name);
+
+				while(!Patchfile.eof())
+				{
+					buf = new char[256];
+					Patchfile.getline(buf,256);
+					m_TextList.push_back(buf);
+				}
+
+				Patchfile.close();
+
+				ret = true;
+				break;
+			}
+		}
+	}
+
+	char curdir[256];
+	while(1)
+	{
+		char *reldir;
+		getcwd(curdir,256);
+		reldir = curdir+strlen(curdir)-strlen("data");
+		if(strcmp(reldir,"data"))
+			chdir("..");
+		else
+			break;
+	}
+
+	chdir("..");
+	closedir(dir);
+
+	return ret;
+}
+
+void CPatcher::patchMemfromFile(const char *patch_file_name, int offset)
+{
+	unsigned char *buf_to_patch;
+	unsigned char byte;
+
+	ifstream Patchfile(patch_file_name, ios::binary);
+
+	if(!Patchfile) return;
+
+	buf_to_patch = m_data + offset;
+
+	// TODO: Add a routine which checks the sizes of the file.
+	long counter = 0;
+
+	while(!Patchfile.eof())
+	{
+		byte = (unsigned char) Patchfile.get();
+		memcpy(buf_to_patch+counter,&byte,1); // one byte every time ;-)
+		counter++;
+	}
+
+	Patchfile.close();
+}