Improve contrib/blast to return unused bytes. Fix the test code

to report the count of unused bytes at the end correctly.  Add the
ability to provide initial input to blast().

1 files changed, 11 insertions, 3 deletions

diff --git a/contrib/blast/blast.h b/contrib/blast/blast.h
index 658cfd3..6cf65ed 100644
--- a/contrib/blast/blast.h
+++ b/contrib/blast/blast.h
@@ -1,6 +1,6 @@
 /* blast.h -- interface for blast.c
-  Copyright (C) 2003, 2012 Mark Adler
-  version 1.2, 24 Oct 2012
+  Copyright (C) 2003, 2012, 2013 Mark Adler
+  version 1.3, 24 Aug 2013
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the author be held liable for any damages
@@ -42,7 +42,8 @@ typedef int (*blast_out)(void *how, unsigned char *buf, unsigned len);
  */
 
 
-int blast(blast_in infun, void *inhow, blast_out outfun, void *outhow);
+int blast(blast_in infun, void *inhow, blast_out outfun, void *outhow,
+          unsigned *left, unsigned char **in);
 /* Decompress input to output using the provided infun() and outfun() calls.
  * On success, the return value of blast() is zero.  If there is an error in
  * the source data, i.e. it is not in the proper format, then a negative value
@@ -55,12 +56,19 @@ int blast(blast_in infun, void *inhow, blast_out outfun, void *outhow);
  * an input error.  (blast() only asks for input if it needs it.)  inhow is for
  * use by the application to pass an input descriptor to infun(), if desired.
  *
+ * If left and in are not NULL and *left is not zero when blast() is called,
+ * then the *left bytes are *in are consumed for input before infun() is used.
+ *
  * The output function is invoked: err = outfun(how, buf, len), where the bytes
  * to be written are buf[0..len-1].  If err is not zero, then blast() returns
  * with an output error.  outfun() is always called with len <= 4096.  outhow
  * is for use by the application to pass an output descriptor to outfun(), if
  * desired.
  *
+ * If there is any unused input, *left is set to the number of bytes that were
+ * read and *in points to them.  Otherwise *left is set to zero and *in is set
+ * to NULL.  If left or in are NULL, then they are not set.
+ *
  * The return codes are:
  *
  *   2:  ran out of input before completing decompression