Added initial version of T64 output driver.

1 files changed, 158 insertions, 0 deletions

diff --git a/src/t64out.c b/src/t64out.c
new file mode 100644
index 0000000..6509323
--- /dev/null
+++ b/src/t64out.c
@@ -0,0 +1,158 @@
+/*
+
+    casm - Simple, portable assembler
+
+    Copyright (C) 2003-2015  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 3 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, see <http://www.gnu.org/licenses/>.
+
+    -------------------------------------------------------------------------
+
+    Commodore T64 tape output handler.
+
+*/
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "global.h"
+#include "codepage.h"
+#include "t64out.h"
+
+
+/* ---------------------------------------- MACROS & TYPES
+*/
+
+#define NOT_USED        0
+
+/* ---------------------------------------- PRIVATE FUNCTIONS
+*/
+
+static void WriteByte(FILE *fp, Byte b)
+{
+    putc(b, fp);
+}
+
+
+static void WriteWord(FILE *fp, int w)
+{
+    WriteByte(fp, w & 0xff);
+    WriteByte(fp, (w & 0xff00) >> 8);
+}
+
+
+static void WriteLong(FILE *fp, unsigned long l)
+{
+    int f;
+
+    for(f = 0; f < 4; f++)
+    {
+        WriteByte(fp, l & 0xff);
+        l >>= 8u;
+    }
+}
+
+
+static void WriteString(FILE *fp, const char *p, int len,
+                        Byte fill, Codepage cp)
+{
+    while(len--)
+    {
+        WriteByte(fp, *p ? CodeFromNative(cp, *p++) : CodeFromNative(cp, fill));
+    }
+}
+
+
+/* ---------------------------------------- INTERFACES
+*/
+const ValueTable *T64OutputOptions(void)
+{
+    return NULL;
+}
+
+CommandStatus T64OutputSetOption(int opt, int argc, char *argv[],
+                                     int quoted[],
+                                     char *error, size_t error_size)
+{
+    return CMD_NOT_KNOWN;
+}
+
+int T64Output(const char *filename, const char *filename_bank,
+              MemoryBank **bank, int count, char *error, size_t error_size)
+{
+    FILE *fp = fopen(filename, "wb");
+    int f;
+    int offset;
+
+    if (!fp)
+    {
+        snprintf(error, error_size, "Failed to create %s\n", filename);
+        return FALSE;
+    }
+
+    /* Write signature
+    */
+    WriteString(fp, "C64 tape image file", 32, 0, CP_ASCII);
+
+    /* Write directory header
+    */
+    WriteWord(fp, 0x1010);
+    WriteWord(fp, count);
+    WriteWord(fp, count);
+    WriteWord(fp, NOT_USED);
+    WriteString(fp, filename, 24, ' ', CP_CBM);
+
+    /* Offset to tape data
+    */
+    offset = 64 + 32 * count;
+
+    /* Write directory entries
+    */
+    for(f = 0; f < count; f++)
+    {
+        WriteByte(fp, 1);
+        WriteByte(fp, 0x82);
+        WriteWord(fp, bank[f]->min_address_used);
+        WriteWord(fp, bank[f]->max_address_used);
+        WriteWord(fp, NOT_USED);
+        WriteLong(fp, offset);
+        WriteWord(fp, NOT_USED);
+        WriteWord(fp, NOT_USED);
+
+        offset += bank[f]->max_address_used - bank[f]->min_address_used + 1;
+    }
+
+    /* Write actual contents
+    */
+    for(f = 0; f < count; f++)
+    {
+        Byte *mem;
+        int min, max, len;
+
+        mem = bank[f]->memory;
+        min = bank[f]->min_address_used;
+        max = bank[f]->max_address_used;
+        len = max - min + 1;
+
+        fwrite(mem, len, 1, fp);
+    }
+
+    fclose(fp);
+
+    return TRUE;
+}
+
+
+/*
+vim: ai sw=4 ts=8 expandtab
+*/