cleanup: factor out runlength encoding

git-svn-id: http://svn.code.sf.net/p/netpbm/code/trunk@2600 9d0c8265-081b-0410-96cb-a4ca84ce46f8

1 files changed, 51 insertions, 0 deletions

diff --git a/lib/util/runlength.h b/lib/util/runlength.h
new file mode 100644
index 00000000..4857ae61
--- /dev/null
+++ b/lib/util/runlength.h
@@ -0,0 +1,51 @@
+#ifndef RUNLENGTH_INCLUDED
+#define RUNLENGTH_INCLUDED
+
+#include "pm_config.h"
+
+#include <limits.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+#if 0
+} /* to fake out automatic code indenters */
+#endif
+
+
+enum pm_RleMode { PM_RLE_PACKBITS,          /* most common mode */
+                  PM_RLE_GRAPHON,           /* reserved */ 
+                  PM_RLE_PPA,               /* reserved */
+                  PM_RLE_SGI8,              /* reserved */
+                  PM_RLE_SGI16,
+                  PM_RLE_PALM16
+                };
+
+size_t
+pm_rlenc_maxbytes (size_t          const inSize,
+                   enum pm_RleMode const mode);
+
+void
+pm_rlenc_allocoutbuf(unsigned char ** const outbufP,
+                     size_t           const inSize,
+                     enum pm_RleMode  const mode);
+
+
+void
+pm_rlenc_freebuf(void * const buf);
+
+void
+pm_rlenc_compressbyte(const unsigned char * const inbuf,
+                      unsigned char       * const outbuf,
+                      enum pm_RleMode       const mode,
+                      size_t                const inSize,
+                      size_t              * const outputSizeP);
+
+void
+pm_rlenc_compressword(const uint16_t      * const inbuf,
+                      unsigned char       * const outbuf,
+                      enum pm_RleMode       const mode,
+                      size_t                const itemCnt,
+                      size_t              * const outputSizeP);
+
+#endif