Add xpmap()/xpunmap() functions to map a file into process memory space.

src/xpdev/xpmap.c

+/* xpmap.c */
+
+/* mmap() style cross-platform development wrappers */
+
+/* $Id$ */
+
+/****************************************************************************
+ * @format.tab-size 4		(Plain Text/Source Code File Header)			*
+ * @format.use-tabs true	(see http://www.synchro.net/ptsc_hdr.html)		*
+ *																			*
+ * Copyright 2011 Rob Swindell - http://www.synchro.net/copyright.html		*
+ *																			*
+ * This library is free software; you can redistribute it and/or			*
+ * modify it under the terms of the GNU Lesser General Public License		*
+ * as published by the Free Software Foundation; either version 2			*
+ * of the License, or (at your option) any later version.					*
+ * See the GNU Lesser General Public License for more details: lgpl.txt or	*
+ * http://www.fsf.org/copyleft/lesser.html									*
+ *																			*
+ * Anonymous FTP access to the most recent released source is available at	*
+ * ftp://vert.synchro.net, ftp://cvs.synchro.net and ftp://ftp.synchro.net	*
+ *																			*
+ * Anonymous CVS access to the development source and modification history	*
+ * is available at cvs.synchro.net:/cvsroot/sbbs, example:					*
+ * cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs login			*
+ *     (just hit return, no password is necessary)							*
+ * cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs checkout src		*
+ *																			*
+ * For Synchronet coding style and modification guidelines, see				*
+ * http://www.synchro.net/source.html										*
+ *																			*
+ * You are encouraged to submit any modifications (preferably in Unix diff	*
+ * format) via e-mail to mods@synchro.net									*
+ *																			*
+ * Note: If this box doesn't appear square, then you need to fix your tabs.	*
+ ****************************************************************************/
+
+#include "xpmap.h"
+
+#if defined(__unix__)
+
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+struct xpmapping *xpmap(const char *filename, enum xpmap_type type)
+{
+	int					fd;
+	void				*addr=NULL;
+	int					oflags;
+	int					mflags;
+	int					mprot;
+	struct stat			*sb;
+	struct xpmapping	*ret;
+
+	switch(type) {
+		case XPMAP_READ:
+			oflags=O_RDONLY;
+			mflags=0;
+			mprot=PROT_READ;
+			break;
+		case XPMAP_WRITE:
+			oflags=O_RDWR;
+			mflags=MAP_SHARED;
+			mprot=PROT_READ|PROT_WRITE;
+			break;
+		case XPMAP_COPY:
+			oflags=O_RDWR;
+			mflags=MAP_PRIVATE;
+			mprot=PROT_READ|PROT_WRITE;
+			break;
+	}
+
+	fd=open(filename, oflags);
+	if(fd == -1)
+		return NULL;
+	if(fstat(fd, &sb)==-1)
+		return NULL;
+	addr=mmap(NULL, sb.st_size, mprot, mflags, fd, 0);
+	if(addr==MAP_FAILED)
+		return NULL;
+	ret=(struct xpmapping *)malloc(sizeof(struct xpmapping));
+	if(ret==NULL)
+		return NULL;
+	ret->addr=addr;
+	ret->fd=fd;
+	ret->size=sb.st_size;
+	return ret;
+}
+
+void xpunmap(struct xpmapping *map)
+{
+	munmap(map->addr, map->size);
+	close(map->fd);
+	free(map);
+}
+
+#elif defined(_WIN32)	
+
+struct xpmapping *xpmap(const char *filename, enum xpmap_type type)
+{
+	HANDLE				fd;
+	HANDLE				md;
+	OFSTRUCT			of;
+	UINT				oflags;
+	DWORD				mattrs;
+	DWORD				mprot;
+	DWORD				maccess;
+	DWORD				size;
+	void				*addr;
+	struct xpmapping	*ret;
+
+	switch(type) {
+		case XPMAP_READ:
+			oflags=OF_READ|OF_SHARE_DENY_NONE;
+			mprot=PAGE_READONLY;
+			mattrs=0;
+			maccess=FILE_MAP_READ;
+			break;
+		case XPMAP_WRITE:
+			oflags=OF_READWRITE|OF_SHARE_DENY_NONE;
+			mprot=PAGE_READWRITE;
+			mflags=0;
+			maccess=FILE_MAP_WRITE;
+			break;
+		case XPMAP_COPY:
+			oflags=OF_READ|OF_SHARE_DENY_NONE;
+			mprot=PAGE_WRITECOPY;
+			mflags=0;
+			maccess=FILE_MAP_COPY;
+			break;
+	}
+
+	fd=OpenFile(filename, &of, oflags);
+	if(fd == HFILE_ERROR)
+		return NULL;
+	if((size=GetFileSize(fd, NULL))==INVALID_FILE_SIZE)
+		return NULL;
+	md=CreateFileMapping(fd, NULL, mprot, 0, size, NULL);
+	if(md==NULL)
+		return NULL;
+	addr=MapViewOfFile(md, maccess, 0, 0, size);
+	ret=(struct xpmapping *)malloc(sizeof(struct xpmapping));
+	if(ret==NULL)
+		return NULL;
+	ret->addr=addr;
+	ret->fd=fd;
+	ret->md=md;
+	ret->size=size;
+	return ret;
+}
+
+void xpunmap(struct xpmapping *map)
+{
+	UnmapViewOfFile(map->addr);
+	CloseHandle(map->md);
+	CloseHandle(map->fd);
+	free(map);
+}
+
+#else
+
+	#error "Need mmap wrappers."
+
+#endif

src/xpdev/xpmap.h

+/* xpmap.h */
+
+/* mmap() style cross-platform development wrappers */
+
+/* $Id$ */
+
+/****************************************************************************
+ * @format.tab-size 4		(Plain Text/Source Code File Header)			*
+ * @format.use-tabs true	(see http://www.synchro.net/ptsc_hdr.html)		*
+ *																			*
+ * Copyright 2011 Rob Swindell - http://www.synchro.net/copyright.html		*
+ *																			*
+ * This library is free software; you can redistribute it and/or			*
+ * modify it under the terms of the GNU Lesser General Public License		*
+ * as published by the Free Software Foundation; either version 2			*
+ * of the License, or (at your option) any later version.					*
+ * See the GNU Lesser General Public License for more details: lgpl.txt or	*
+ * http://www.fsf.org/copyleft/lesser.html									*
+ *																			*
+ * Anonymous FTP access to the most recent released source is available at	*
+ * ftp://vert.synchro.net, ftp://cvs.synchro.net and ftp://ftp.synchro.net	*
+ *																			*
+ * Anonymous CVS access to the development source and modification history	*
+ * is available at cvs.synchro.net:/cvsroot/sbbs, example:					*
+ * cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs login			*
+ *     (just hit return, no password is necessary)							*
+ * cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs checkout src		*
+ *																			*
+ * For Synchronet coding style and modification guidelines, see				*
+ * http://www.synchro.net/source.html										*
+ *																			*
+ * You are encouraged to submit any modifications (preferably in Unix diff	*
+ * format) via e-mail to mods@synchro.net									*
+ *																			*
+ * Note: If this box doesn't appear square, then you need to fix your tabs.	*
+ ****************************************************************************/
+
+#ifndef _XPMAP_H
+#define _XPMAP_H
+
+#include "gen_defs.h"
+
+void *xpmap(const char *filename, int flags);
+
+enum xpmap_type {
+	XPMAP_READ,
+	XPMAP_WRITE,
+	XPMAP_COPY
+};
+
+#if defined(__unix__)
+
+#include <sys/mman.h>
+struct xpmapping {
+	void	*addr;
+	int		fd;
+	size_t	size;
+};
+
+#elif defined(_WIN32)
+
+struct xpmapping {
+	void		*addr;
+	HANDLE		fd;
+	HANDLE		md;
+	uint64_t	size;
+};
+
+#else
+
+	#error "Need mmap wrappers."
+
+#endif