1 files changed, 67 insertions, 0 deletions
diff --git a/Imaging/libImaging/HexDecode.c b/Imaging/libImaging/HexDecode.c
new file mode 100644
index 0000000..dddbe00
--- /dev/null
+++ b/Imaging/libImaging/HexDecode.c
@@ -0,0 +1,67 @@
+/*
+ * The Python Imaging Library.
+ * $Id: HexDecode.c 2134 2004-10-06 08:55:20Z fredrik $
+ *
+ * decoder for hex encoded image data
+ *
+ * history:
+ *	96-05-16 fl	Created
+ *
+ * Copyright (c) Fredrik Lundh 1996.
+ * Copyright (c) Secret Labs AB 1997.
+ *
+ * See the README file for information on usage and redistribution.
+ */
+
+
+#include "Imaging.h"
+
+#define	HEX(v) ((v >= '0' && v <= '9') ? v - '0' :\
+		(v >= 'a' && v <= 'f') ? v - 'a' + 10 :\
+		(v >= 'A' && v <= 'F') ? v - 'A' + 10 : -1)
+
+int
+ImagingHexDecode(Imaging im, ImagingCodecState state, UINT8* buf, int bytes)
+{
+    UINT8* ptr;
+    int a, b;
+
+    ptr = buf;
+
+    for (;;) {
+
+	if (bytes < 2)
+	    return ptr - buf;
+
+	a = HEX(ptr[0]);
+	b = HEX(ptr[1]);
+
+	if (a < 0 || b < 0) {
+
+	    ptr++;
+	    bytes--;
+
+	} else {
+
+	    ptr += 2;
+	    bytes -= 2;
+
+	    state->buffer[state->x] = (a<<4) + b;
+
+	    if (++state->x >= state->bytes) {
+
+		/* Got a full line, unpack it */
+		state->shuffle((UINT8*) im->image[state->y], state->buffer,
+			       state->xsize);
+
+		state->x = 0;
+
+		if (++state->y >= state->ysize) {
+		    /* End of file (errcode = 0) */
+		    return -1;
+		}
+	    }
+
+	}
+    }
+}