4 files changed, 330 insertions, 1 deletions

diff --git a/src/FileMgr.cpp b/src/FileMgr.cpp
new file mode 100644
index 00000000..3aad9794
--- /dev/null
+++ b/src/FileMgr.cpp
@@ -0,0 +1,294 @@
+#define _CRT_SECURE_NO_WARNINGS
+#include <fcntl.h>
+#include <direct.h>
+#include "common.h"
+#include "patcher.h"
+#include "FileMgr.h"
+
+/*
+ * Windows FILE is BROKEN for GTA.
+ *
+ * We need to support mapping between LF and CRLF for text files
+ * but we do NOT want to end the file at the first sight of a SUB character.
+ * So here is a simple implementation of a FILE interface that works like GTA expects.
+ */
+
+struct myFILE
+{
+	bool isText;
+	FILE *file;
+};
+
+#define NUMFILES 20
+static myFILE myfiles[NUMFILES];
+
+/* Force file to open as binary but remember if it was text mode */
+static int
+myfopen(const char *filename, const char *mode)
+{
+	int fd;
+	char realmode[10], *p;
+
+	for(fd = 1; fd < NUMFILES; fd++)
+		if(myfiles[fd].file == nil)
+			goto found;
+	return 0;	// no free fd
+found:
+	myfiles[fd].isText = strchr(mode, 'b') == nil;
+	p = realmode;
+	while(*mode)
+		if(*mode != 't' && *mode != 'b')
+			*p++ = *mode++;
+		else
+			mode++;
+	*p++ = 'b';
+	*p = '\0';
+	myfiles[fd].file = fopen(filename, realmode);
+	if(myfiles[fd].file == nil)
+		return 0;
+	return fd;
+}
+
+static void
+myfclose(int fd)
+{
+	assert(fd < NUMFILES);
+	if(myfiles[fd].file){
+		fclose(myfiles[fd].file);
+		myfiles[fd].file = nil;
+	}
+}
+
+static int
+myfgetc(int fd)
+{
+	int c;
+	c = fgetc(myfiles[fd].file);
+	if(myfiles[fd].isText && c == 015){
+		/* translate CRLF to LF */
+		c = fgetc(myfiles[fd].file);
+		if(c == 012)
+			return c;
+		ungetc(c, myfiles[fd].file);
+		return 015;
+	}
+	return c;
+}
+
+static int
+myfputc(int c, int fd)
+{
+	/* translate LF to CRLF */
+	if(myfiles[fd].isText && c == 012)
+		fputc(015, myfiles[fd].file);
+	return fputc(c, myfiles[fd].file);
+}
+
+static char*
+myfgets(char *buf, int len, int fd)
+{
+	int c;
+	char *p;
+
+	p = buf;
+	len--;	// NUL byte
+	while(len--){
+		c = myfgetc(fd);
+		if(c == EOF){
+			if(p == buf)
+				return nil;
+			break;
+		}
+		*p++ = c;
+		if(c == '\n')
+			break;
+	}
+	*p = '\0';
+	return buf;
+}
+
+static int
+myfread(void *buf, size_t elt, size_t n, int fd)
+{
+	if(myfiles[fd].isText){
+		char *p;
+		size_t i;
+		int c;
+
+		n *= elt;
+		p = (char*)buf;
+		for(i = 0; i < n; i++){
+			c = myfgetc(fd);
+			if(c == EOF)
+				break;
+			*p++ = c;
+		}
+		return i / elt;
+	}
+	return fread(buf, elt, n, myfiles[fd].file);
+}
+
+static int
+myfwrite(void *buf, size_t elt, size_t n, int fd)
+{
+	if(myfiles[fd].isText){
+		char *p;
+		size_t i;
+		int c;
+
+		n *= elt;
+		p = (char*)buf;
+		for(i = 0; i < n; i++){
+			c = *p++;
+			myfputc(c, fd);
+			if(feof(myfiles[fd].file))	// is this right?
+				break;
+		}
+		return i / elt;
+	}
+	return fwrite(buf, elt, n, myfiles[fd].file);
+}
+
+static int
+myfseek(int fd, long offset, int whence)
+{
+	return fseek(myfiles[fd].file, offset, whence);
+}
+
+static int
+myfeof(int fd)
+{
+	return feof(myfiles[fd].file);
+}
+
+
+char *CFileMgr::ms_rootDirName = (char*)0x5F18F8;
+char *CFileMgr::ms_dirName = (char*)0x713CA8;
+
+void
+CFileMgr::Initialise(void)
+{
+	_getcwd(ms_rootDirName, 128);
+	strcat(ms_rootDirName, "\\");
+}
+
+void
+CFileMgr::ChangeDir(const char *dir)
+{
+	if(*dir == '\\'){
+		strcpy(ms_dirName, ms_rootDirName);
+		dir++;
+	}
+	if(*dir != '\0'){
+		strcat(ms_dirName, dir);
+		// BUG in the game it seems, it's off by one
+		if(dir[strlen(dir)-1] != '\\')
+			strcat(ms_dirName, "\\");
+	}
+	chdir(ms_dirName);
+}
+
+void
+CFileMgr::SetDir(const char *dir)
+{
+	strcpy(ms_dirName, ms_rootDirName);
+	if(*dir != '\0'){
+		strcat(ms_dirName, dir);
+		// BUG in the game it seems, it's off by one
+		if(dir[strlen(dir)-1] != '\\')
+			strcat(ms_dirName, "\\");
+	}
+	chdir(ms_dirName);
+}
+
+void
+CFileMgr::SetDirMyDocuments(void)
+{
+	SetDir("");	// better start at the root if user directory is relative
+	chdir(GetUserDirectory());
+}
+
+int
+CFileMgr::LoadFile(const char *file, uint8 *buf, int unused, const char *mode)
+{
+	int fd;
+	int n, len;
+
+	fd = myfopen(file, mode);
+	if(fd == 0)
+		return 0;
+	len = 0;
+	do{
+		n = myfread(buf + len, 1, 0x4000, fd);
+		if(n < 0)
+			return -1;
+		len += n;
+	}while(n == 0x4000);
+	buf[len] = 0;
+	myfclose(fd);
+	return len;
+}
+
+int
+CFileMgr::OpenFile(const char *file, const char *mode)
+{
+	return myfopen(file, mode);
+}
+
+int
+CFileMgr::OpenFileForWriting(const char *file)
+{
+	return OpenFile(file, "wb");
+}
+
+int
+CFileMgr::Read(int fd, char *buf, int len)
+{
+	return myfread(buf, 1, len, fd);
+}
+
+int
+CFileMgr::Write(int fd, char *buf, int len)
+{
+	return myfwrite(buf, 1, len, fd);
+}
+
+bool
+CFileMgr::Seek(int fd, int offset, int whence)
+{
+	return !!myfseek(fd, offset, whence);
+}
+
+char*
+CFileMgr::ReadLine(int fd, char *buf, int len)
+{
+	return myfgets(buf, len, fd);
+}
+
+void
+CFileMgr::CloseFile(int fd)
+{
+	myfclose(fd);
+}
+
+int
+CFileMgr::GetErrorReadWrite(int fd)
+{
+	return myfeof(fd);
+}
+
+STARTPATCHES
+	InjectHook(0x478F80, CFileMgr::Initialise, PATCH_JUMP);
+	InjectHook(0x478FB0, CFileMgr::ChangeDir, PATCH_JUMP);
+	InjectHook(0x479020, CFileMgr::SetDir, PATCH_JUMP);
+	InjectHook(0x479080, CFileMgr::SetDirMyDocuments, PATCH_JUMP);
+	InjectHook(0x479090, CFileMgr::LoadFile, PATCH_JUMP);
+	InjectHook(0x479100, CFileMgr::OpenFile, PATCH_JUMP);
+	InjectHook(0x479120, CFileMgr::OpenFileForWriting, PATCH_JUMP);
+	InjectHook(0x479140, CFileMgr::Read, PATCH_JUMP);
+	InjectHook(0x479160, CFileMgr::Write, PATCH_JUMP);
+	InjectHook(0x479180, CFileMgr::Seek, PATCH_JUMP);
+	InjectHook(0x4791D0, CFileMgr::ReadLine, PATCH_JUMP);
+	InjectHook(0x479200, CFileMgr::CloseFile, PATCH_JUMP);
+	InjectHook(0x479210, CFileMgr::GetErrorReadWrite, PATCH_JUMP);
+ENDPATCHES
diff --git a/src/FileMgr.h b/src/FileMgr.h
new file mode 100644
index 00000000..a77ae6fa
--- /dev/null
+++ b/src/FileMgr.h
@@ -0,0 +1,21 @@
+#pragma once
+
+class CFileMgr
+{
+	static char *ms_rootDirName;	//[128];
+	static char *ms_dirName;	//[128];
+public:
+	static void Initialise(void);
+	static void ChangeDir(const char *dir);
+	static void SetDir(const char *dir);
+	static void SetDirMyDocuments(void);
+	static int LoadFile(const char *file, uint8 *buf, int unused, const char *mode);
+	static int OpenFile(const char *file, const char *mode);
+	static int OpenFileForWriting(const char *file);
+	static int Read(int fd, char *buf, int len);
+	static int Write(int fd, char *buf, int len);
+	static bool Seek(int fd, int offset, int whence);
+	static char *ReadLine(int fd, char *buf, int len);
+	static void CloseFile(int fd);
+	static int GetErrorReadWrite(int fd);
+};
diff --git a/src/common.h b/src/common.h
index e55e5b52..272e5017 100644
--- a/src/common.h
+++ b/src/common.h
@@ -5,6 +5,7 @@
 #pragma warning(disable: 4244)	// int to float
 #pragma warning(disable: 4800)	// int to bool
 #pragma warning(disable: 4838)  // narrowing conversion
+#pragma warning(disable: 4996)  // POSIX names
 
 #include <stdint.h>
 #include <math.h>
@@ -61,6 +62,8 @@ extern RsGlobalType &RsGlobal;
 #define SCREENW (RsGlobal.maximumWidth)
 #define SCREENH (RsGlobal.maximumHeight)
 
+char *GetUserDirectory(void);
+
 struct GlobalScene
 {
 	RpWorld *world;
diff --git a/src/main.cpp b/src/main.cpp
index b17a30a3..b7d1d151 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,5 +1,6 @@
-#include "common.h"
+#include <direct.h>
 #include <Windows.h>
+#include "common.h"
 #include "patcher.h"
 #include "Renderer.h"
 #include "debugmenu_public.h"
@@ -36,6 +37,16 @@ mysrand(unsigned int seed)
 	myrand_seed = seed;
 }
 
+// platform stuff
+char*
+GetUserDirectory(void)
+{
+	static char path[MAX_PATH];
+	strcpy(path, "userfiles");
+	mkdir(path);
+	return path;
+}
+
 
 int (*open_script_orig)(const char *path, const char *mode);
 int