#ifndef __CRC32_H__
#define __CRC32_H__

#include "ecb.h"
#include "uuint.h"

#ifdef __cplusplus
extern "C" {
#endif

typedef uint32_t crc32_t;

#define CRC32_INIT ((crc32_t)0)

/*
 * Update a running crc with the bytes buf[0..len-1] and return the updated
 * crc. If buf is NULL, this function returns the required initial value
 * for the crc. Pre- and post-conditioning (one's complement) is performed
 * within this function so it shouldn't be done by the application.
 * Usage example:
 *
 *   uLong crc = CRC32_INIT;
 *
 *   while (read_buffer (buffer, length) != EOF) {
 *     crc = crc32 (crc, buffer, length);
 *   }
 *   if (crc != original_crc) error ();
 */
UULIBINT_FUNC crc32_t uu_crc32 (crc32_t prev, const void *data, unsigned int len);

/*
 * This calculates the crc of a block of data consisting of two
 * parts, using only their CRCs. This is used to quickly combine
 * part CRCs into a full file CRC.
 */
UULIBINT_FUNC uint32_t uu_crc32_combine (uint32_t crcA, uint32_t crcB, size_t lengthB);

#ifdef __cplusplus
}
#endif
#endif