initial commit

1 files changed, 88 insertions, 0 deletions

diff --git a/dumptxt.c b/dumptxt.c
new file mode 100644
index 0000000..1c1c3cd
--- /dev/null
+++ b/dumptxt.c
@@ -0,0 +1,88 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+/* extract DSCII text from rom image, print in human-readable form.
+   usage: ./dumptxt startaddr endaddr
+   addresses are hex.
+
+	$C0: copyright symbol (double-wide), we print as 'c)'
+	$C1 - $DA: alphabet (but J Q Z are bogus-looking)
+	$B0 - $BA: numbers
+	$8D - carriage return (and newline), we print as 'nl'
+	$A0 - space
+
+	$F0-$FF set the color mask, but only in text drawn by draw_title_text.
+	We print these as cN where N is the low nybble.
+ */
+
+#define ROM "defender.rom"
+
+int main(int argc, char **argv) {
+	int i, start, end, needaddr = 1;
+	unsigned char buf[16384];
+	FILE *f = fopen(ROM, "rb");
+
+	if(argc != 3) {
+		fprintf(stderr, "Usage: %s startaddr endaddr\n  give addresses in hex, e.g. %s b844 b86c\n", argv[0], argv[0]);
+		exit(1);
+	}
+
+	if(!f) {
+		perror(ROM);
+		exit(1);
+	}
+
+	fread(buf, 16384, 1, f);
+
+	start = (int)strtol(argv[1], 0, 16);
+	end = (int)strtol(argv[2], 0, 16);
+
+	if(start < 0x8000 || start >= 0xc000 || end < 0x8000 || end >= 0xc000) {
+		fprintf(stderr, "start/end addr(s) invalid or out of range, must be 8000-bfff\n");
+		exit(1);
+	}
+
+	fprintf(stderr, "dumping text from $%04x to $%04x\n", start, end);
+
+	for(i = start; i <= end; i++) {
+		unsigned char c = buf[i - 0x8000];
+
+		if(needaddr) {
+			printf("%04x: '", start);
+			needaddr = 0;
+		}
+
+		if(!c) {
+			putchar('\'');
+			putchar('\n');
+			needaddr = 1;
+		} else if(c >= 0xb0 && c <= 0xba) {
+			putchar(c - 0xb0 + '0');
+		} else if(c == 0xc0) {
+			putchar('c');
+			putchar(')');
+		} else if(c == 0xa0) {
+			putchar(' ');
+		} else if(c == 0x8d) {
+			putchar('n');
+			putchar('l');
+		} else if(c >= 0xc1 && c <= 0xda) {
+			putchar(c - 0xc1 + 'A');
+		} else if(c >= 0xf0) {
+			putchar('c');
+			if(c > 0xf9)
+				putchar(c - 0xfa + 'A');
+			else
+				putchar(c - 0xf0 + '0');
+		} else {
+			putchar('?');
+		}
+	}
+
+	if(!needaddr) {
+		putchar('\'');
+		putchar('\n');
+		fprintf(stderr, "last string not null-terminated!\n");
+	}
+	return 0;
+}