3 files changed, 6 insertions, 6 deletions
diff --git a/hl/tools/gif2h5/gif.h b/hl/tools/gif2h5/gif.h
index 2b4a344..1a8cfe4 100644
--- a/hl/tools/gif2h5/gif.h
+++ b/hl/tools/gif2h5/gif.h
@@ -157,8 +157,8 @@ int ReadGifApplication(GIFAPPLICATION *, GIFBYTE **);
 int ReadGifComment(GIFCOMMENT *, GIFBYTE **);
 
 /* HDFGIFWR.C */
-int hdfWriteGIF(FILE *fp, GIFBYTE *pic, int ptype, int w, int h, GIFBYTE *rmap, GIFBYTE *gmap, GIFBYTE *bmap,
-                GIFBYTE *pc2ncmap, int numcols, int colorstyle, int BitsPerPixel);
+int hdfWriteGIF(FILE *fp, GIFBYTE *pic, int ptype, int w, int h, const GIFBYTE *rmap, const GIFBYTE *gmap,
+                const GIFBYTE *bmap, const GIFBYTE *pc2ncmap, int numcols, int colorstyle, int BitsPerPixel);
 
 /* WRITEHDF.C */
 int WriteHDF(GIFTOMEM, GIFCHAR *);
@@ -176,7 +176,7 @@ int ReadHDF(GIFBYTE **data, GIFBYTE palette[256][3], hsize_t *image_size, GIFCHA
             GIFCHAR *dset_name, GIFCHAR *pal_name);
 
 GIFBYTE *Decompress(GIFIMAGEDESC *, GIFHEAD *);
-GIFBYTE  GetByte(GIFBYTE *);
+GIFBYTE  GetByte(const GIFBYTE *);
 GIFWORD  GetWord(GIFBYTE *);
 
 void cleanup(GIFBYTE *);
diff --git a/hl/tools/gif2h5/gifread.c b/hl/tools/gif2h5/gifread.c
index b88264b..ef2bdd4 100644
--- a/hl/tools/gif2h5/gifread.c
+++ b/hl/tools/gif2h5/gifread.c
@@ -38,7 +38,7 @@ GetWord(GIFBYTE *MemGif)
 }
 
 GIFBYTE
-GetByte(GIFBYTE *MemGif) { return *MemGif; }
+GetByte(const GIFBYTE *MemGif) { return *MemGif; }
 
 /*
  *  Read a GIF image GIFBYTE Header.
diff --git a/hl/tools/gif2h5/hdfgifwr.c b/hl/tools/gif2h5/hdfgifwr.c
index 8068829..21b14d1 100644
--- a/hl/tools/gif2h5/hdfgifwr.c
+++ b/hl/tools/gif2h5/hdfgifwr.c
@@ -135,8 +135,8 @@ static int EOFCode;
 
 /*************************************************************/
 int
-hdfWriteGIF(FILE *fp, byte *pic, int ptype, int w, int h, byte *rmap, byte *gmap, byte *bmap, byte *pc2ncmap,
-            int numcols, int colorstyle, int BitsPerPixel)
+hdfWriteGIF(FILE *fp, byte *pic, int ptype, int w, int h, const byte *rmap, const byte *gmap,
+            const byte *bmap, const byte *pc2ncmap, int numcols, int colorstyle, int BitsPerPixel)
 {
     int   InitCodeSize;
     int   i;