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-rw-r--r--src/common/grfio.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/common/grfio.h b/src/common/grfio.h
index e2a70ae75..4ccdd00c7 100644
--- a/src/common/grfio.h
+++ b/src/common/grfio.h
@@ -13,7 +13,7 @@ char *grfio_alloc_ptr(char *fname);
#define grfio_read(fn) grfio_reads(fn, NULL)
int grfio_size(char*); // GRFIO data file size get
-unsigned long grfio_crc32(const char *buf, unsigned int len);
+unsigned long grfio_crc32(const unsigned char *buf, unsigned int len);
int decode_zip(unsigned char *dest, unsigned long* destLen, const unsigned char* source, unsigned long sourceLen);
int encode_zip(unsigned char *dest, unsigned long* destLen, const unsigned char* source, unsigned long sourceLen);