Initial. Don't... just don't ask.

2011-02-24 00:22:00 -08:00 · 2011-02-24 00:22:00 -08:00 · 00bae13bba
commit 00bae13bba
586 changed files with 129057 additions and 0 deletions
--- a/utils/restorefont.c
+++ b/utils/restorefont.c
@ -0,0 +1,121 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <vga.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include "../src/libvga.h"
+
+/*
+ * Note: Observe that when writing the font to a file, the file to write is
+ * opened after vga_init has been called (so that root permissions have been
+ * given up). This means that there is no major security hole lurking here.
+ */
+
+int main(int argc, char *argv[])
+{
+    FILE *f;
+    unsigned char *font;
+    size_t font_size = FONT_SIZE; /* buffer size in 1.2.11 and before */
+    int can_set = 0;
+    struct stat statbuf;
+
+    if (argc == 1) {
+	printf("Restore corrupted textmode font.\n");
+	printf("Syntax: restorefont option filename\n");
+	printf("	-r filename	Restore VGA font from file.\n");
+	printf("	-w filename	Write current VGA font to file.\n");
+	return 0;
+    }
+    if (argv[1][0] != '-') {
+	printf("Must specify -r or -w.\n");
+	return 1;
+    }
+    switch (argv[1][1]) {
+    case 'r':
+    case 'w':
+	if (argc != 3) {
+	    printf("Must specify filename.\n");
+	    return 1;
+	}
+	break;
+    default:
+	printf("Invalid option. Must specify -r or -w.\n");
+	return 1;
+    }
+    vga_disabledriverreport();
+    vga_setchipset(VGA);	/* avoid SVGA detection */
+    vga_init();
+    /* we are in TEXT mode. Check for availability of vga_ext_set: */
+    if (vga_getmodeinfo(TEXT)->flags & HAVE_EXT_SET) {
+	if (vga_ext_set(VGA_EXT_AVAILABLE, VGA_AVAIL_SET) &
+		(1 << VGA_EXT_FONT_SIZE)) {
+	    can_set = 1;
+	    /* Query the preferred data size: */
+	    font_size = vga_ext_set(VGA_EXT_FONT_SIZE, 0);
+	    if (font_size < FONT_SIZE) {
+		    font_size = FONT_SIZE;
+	    }	    
+	}
+    }
+
+    /* We never need more than that memory: */
+    font = malloc((size_t)font_size);
+    if (!font) {
+	puts("restorefont: out of memory.");
+	goto ex_no_errno;
+    }
+
+    vga_setmode(G640x350x16);
+    switch (argv[1][1]) {
+      case 'r':
+	f = fopen(argv[2], "rb");
+	if (f == NULL) {
+	  error:
+	    perror("restorefont");
+	  ex_no_errno:
+	    vga_setmode(TEXT);
+	    return 1;
+	}
+	if (fstat(fileno(f), &statbuf))
+	    goto error;
+	font_size = statbuf.st_size;
+	/* Check for sensible sizes: */
+	switch (font_size) {
+	    case 0x2000:
+	    case 0x2000 * 4:
+	    case 0x2000 * 8:
+		if (can_set)
+	    	    vga_ext_set(VGA_EXT_FONT_SIZE, font_size);
+		break;
+	    default:
+	    corrupt:
+	        puts("restorefont: input file corrupted.");
+	        goto ex_no_errno;
+	}
+		
+	if (1 != fread(font, font_size, 1, f)) {
+	    if (errno)
+		goto error;
+	    goto corrupt;
+	}
+	fclose(f);
+	vga_puttextfont(font);
+	break;
+      case 'w':
+	/* save as much as we have.. */
+	if (can_set)
+	    vga_ext_set(VGA_EXT_FONT_SIZE, font_size);
+	vga_gettextfont(font);
+	f = fopen(argv[2], "wb");
+	if (f == NULL)
+	    goto error;
+	if (1 != fwrite(font, font_size, 1, f))
+	    goto error;
+	if (fclose(f))
+	    goto error;
+	break;
+    }
+    vga_setmode(TEXT);
+    return 0;
+}