1 files changed, 171 insertions, 0 deletions
diff --git a/tap.c b/tap.c
new file mode 100644
index 0000000..0c9b3c7
--- /dev/null
+++ b/tap.c
@@ -0,0 +1,171 @@
+/*
+
+    int2tap - Convert an Intel segment file to a loadable Spectrum tape file
+
+    Copyright (C) 2004  Ian Cowburn (ianc@noddybox.demon.co.uk)
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    -------------------------------------------------------------------------
+
+*/
+static const char id[]="$Id$";
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "tap.h"
+
+static const char header_id[]=I2T_TAP_H;
+
+
+/* ---------------------------------------- CONSTANTS
+*/
+#undef TRUE
+#undef FALSE
+
+#define TRUE	1
+#define FALSE	0
+
+
+/* ---------------------------------------- TYPES
+*/
+
+
+/* ---------------------------------------- GLOBALS
+*/
+extern const char	*progname;
+
+static FILE		*fp;
+static int		file_no;
+
+
+/* ---------------------------------------- PRIVATE FUNCTIONS
+*/
+unsigned char TapWord(unsigned w, unsigned char chk)
+{
+    putc(w&0xff,fp);
+    chk^=w&0xff;
+    putc(w>>8,fp);
+    chk^=w>>8;
+    return chk;
+}
+
+unsigned char TapByte(unsigned char c, unsigned char chk)
+{
+    putc(c,fp);
+    chk^=c;
+    return chk;
+}
+
+unsigned char TapString(char *p, int len, unsigned char chk)
+{
+    while(len--)
+    {
+    	chk=TapByte(*p++,chk);
+    }
+
+    return chk;
+}
+
+unsigned char TapStream(const unsigned char p[0x10000],
+			unsigned addr, unsigned len, unsigned char chk)
+{
+    while(len--)
+    {
+    	chk=TapByte(p[addr],chk);
+	addr=(addr+1)&0xffff;
+    }
+
+    return chk;
+}
+
+/* ---------------------------------------- INTERFACES
+*/
+
+int TapOpen(const char *filename)
+{
+    file_no=0;
+
+    if (!(fp=fopen(filename,"wb")))
+    {
+    	fprintf(stderr,"%s: Failed to create %s\n",progname,filename);
+    }
+
+    return fp!=NULL;
+}
+
+
+void TapWrite(const unsigned char mem[0x1000],
+	      unsigned addr, unsigned len, int is_code)
+{
+    char name[11]={0};
+    unsigned char chk;
+
+    sprintf(name,"%10.10d",file_no);
+    file_no=(file_no+1)%10000;
+
+    /* Output file header
+    */
+    chk=TapWord(19,chk);
+    chk=TapByte(0,chk);
+
+    if (is_code)
+    {
+	chk=TapByte(3,chk);
+    }
+    else
+    {
+	chk=TapByte(3,chk);
+    }
+
+    chk=TapString(name,10,chk);
+    chk=TapWord(len,chk);
+
+    if (is_code)
+    {
+    	chk=TapWord(addr,chk);
+	chk=TapWord(32768,chk);
+    }
+    else
+    {
+    	chk=TapWord(0,chk);
+	chk=TapWord(0,chk);
+    }
+
+    TapByte(chk,0);
+
+    /* Output file data
+    */
+    chk=0;
+
+    chk=TapWord(len+2,chk);
+    chk=TapStream(mem,addr,len,chk);
+    TapByte(chk,0);
+}
+
+
+void TapClose(void)
+{
+    if (fp)
+    {
+    	fclose(fp);
+	fp=NULL;
+    }
+}
+
+
+/* END OF FILE */