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-rw-r--r--libavutil/adler32.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/libavutil/adler32.h b/libavutil/adler32.h
index 9626c80567..0b890bcc11 100644
--- a/libavutil/adler32.h
+++ b/libavutil/adler32.h
@@ -24,6 +24,18 @@
#include <stdint.h>
#include "attributes.h"
+/**
+ * Calculate the Adler32 checksum of a buffer.
+ *
+ * Passing the return value to a subsequent av_adler32_update() call
+ * allows the checksum of multiple buffers to be calculated as though
+ * they were concatenated.
+ *
+ * @param adler initial checksum value
+ * @param buf pointer to input buffer
+ * @param len size of input buffer
+ * @return updated checksum
+ */
unsigned long av_adler32_update(unsigned long adler, const uint8_t *buf,
unsigned int len) av_pure;