Move bitio.h to util/bitio.h

git-svn-id: http://svn.code.sf.net/p/netpbm/code/trunk@2560 9d0c8265-081b-0410-96cb-a4ca84ce46f8

1 files changed, 89 insertions, 0 deletions

diff --git a/lib/util/bitio.h b/lib/util/bitio.h
new file mode 100644
index 00000000..dfc5a153
--- /dev/null
+++ b/lib/util/bitio.h
@@ -0,0 +1,89 @@
+/*\
+ * $Id: bitio.h,v 1.4 1992/11/24 19:37:02 dws Exp dws $
+ *
+ * bitio.h - bitstream I/O
+ *
+ * Works for (sizeof(unsigned long)-1)*8 bits.
+ *
+ * Copyright (C) 1992 by David W. Sanderson.
+ * 
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose and without fee is hereby granted,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  This software is provided "as is"
+ * without express or implied warranty.
+ *
+ * $Log: bitio.h,v $
+ * Revision 1.4  1992/11/24  19:37:02  dws
+ * Added copyright
+ *
+ * Revision 1.3  1992/11/17  03:37:59  dws
+ * updated comment
+ *
+ * Revision 1.2  1992/11/10  23:10:22  dws
+ * Generalized to handle more than one bitstream at a time.
+ *
+ * Revision 1.1  1992/11/10  18:33:51  dws
+ * Initial revision
+ *
+\*/
+
+#ifndef _BITIO_H_
+#define _BITIO_H_
+
+#include <netpbm/pm.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+#if 0
+} /* to fake out automatic code indenters */
+#endif
+
+typedef struct bitstream	*BITSTREAM;
+
+struct bitstream *
+pm_bitinit(FILE * const f, const char * const mode);
+
+/*
+ * pm_bitfini() - deallocate the given BITSTREAM.
+ *
+ * You must call this after you are done with the BITSTREAM.
+ * 
+ * It may flush some bits left in the buffer.
+ *
+ * Returns the number of bytes written, -1 on error.
+ */
+
+int
+pm_bitfini(BITSTREAM b);
+
+/*
+ * pm_bitread() - read the next nbits into *val from the given file.
+ * 
+ * Returns the number of bytes read, -1 on error.
+ */
+
+int
+pm_bitread(BITSTREAM       b,
+           unsigned long   nbits,
+           unsigned long * val);
+
+/*
+ * pm_bitwrite() - write the low nbits of val to the given file.
+ * 
+ * The last pm_bitwrite() must be followed by a call to pm_bitflush().
+ * 
+ * Returns the number of bytes written, -1 on error.
+ */
+
+int
+pm_bitwrite(BITSTREAM     b,
+            unsigned long nbits,
+            unsigned long val);
+
+#ifdef __cplusplus
+}
+#endif
+#endif