RLE blitter, plus RLE encoding and decoding tools

[bootsplash] / rle / rle.c

diff --git a/rle/rle.c b/rle/rle.c
new file mode 100644 (file)
index 0000000..4acb24c
--- /dev/null
+++ b/rle/rle.c
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+void emit(int c, int count);
+
+int main(void)
+{
+       int c, lastc, count;
+
+       lastc = -1;
+       count = 0;
+
+       while((c = getchar()) != -1) {
+               if(c == lastc && count < 127) {
+                       count++;
+               } else {
+                       emit(lastc, count);
+                       count = 1;
+                       lastc = c;
+               }
+       }
+       emit(lastc, count);
+
+       return 0;
+}
+
+void emit(int c, int count)
+{
+       if(count <= 0 || c < 0) return;
+
+       fprintf(stderr, "emit(%d, %d) -> ", c, count);
+       if(count > 2 || (c & 0x80)) {
+               fprintf(stderr, "%02x %02x\n", (unsigned int)count | 0x80, (unsigned int)c);
+               putchar(count | 0x80);
+               putchar(c);
+       } else {
+               while(count--) {
+                       fprintf(stderr, "%02x\n", (unsigned int)c & 0x7f);
+                       putchar(c);
+               }
+       }
+}