1 files changed, 91 insertions, 0 deletions
diff --git a/Imaging/libImaging/MspDecode.c b/Imaging/libImaging/MspDecode.c
new file mode 100644
index 0000000..af2b842
--- /dev/null
+++ b/Imaging/libImaging/MspDecode.c
@@ -0,0 +1,91 @@
+/*
+ * The Python Imaging Library.
+ * $Id: MspDecode.c 2134 2004-10-06 08:55:20Z fredrik $
+ *
+ * decoder for MSP version 2 data.
+ *
+ * history:
+ *	97-01-03 fl	Created
+ *
+ * Copyright (c) Fredrik Lundh 1997.
+ * Copyright (c) Secret Labs AB 1997.
+ *
+ * See the README file for information on usage and redistribution.
+ */
+
+
+#include "Imaging.h"
+
+
+int
+ImagingMspDecode(Imaging im, ImagingCodecState state, UINT8* buf, int bytes)
+{
+    int n;
+    UINT8* ptr;
+
+    ptr = buf;
+
+    for (;;) {
+
+	if (bytes < 1)
+	    return ptr - buf;
+
+	if (ptr[0] == 0) {
+
+	    /* Run (3 bytes block) */
+	    if (bytes < 3)
+		break;
+
+	    n = ptr[1];
+
+	    if (state->x + n > state->bytes) {
+		state->errcode = IMAGING_CODEC_OVERRUN;
+		return -1;
+	    }
+
+	    memset(state->buffer + state->x, ptr[2], n);
+
+	    ptr += 3;
+	    bytes -= 3;
+
+	} else {
+
+	    /* Literal (1+n bytes block) */
+	    n = ptr[0];
+
+	    if (bytes < 1 + n)
+		break;
+
+	    if (state->x + n > state->bytes) {
+		state->errcode = IMAGING_CODEC_OVERRUN;
+		return -1;
+	    }
+
+	    memcpy(state->buffer + state->x, ptr + 1, n);
+
+	    ptr += 1 + n;
+	    bytes -= 1 + n;
+
+	}
+
+	state->x += n;
+
+	if (state->x >= state->bytes) {
+
+	    /* Got a full line, unpack it */
+	    state->shuffle((UINT8*) im->image[state->y + state->yoff] +
+			   state->xoff * im->pixelsize, state->buffer,
+			   state->xsize);
+
+	    state->x = 0;
+
+	    if (++state->y >= state->ysize) {
+		/* End of file (errcode = 0) */
+		return -1;
+	    }
+	}
+
+    }
+
+    return ptr - buf;
+}