#ifndef SHA256_SHA_H
#define SHA256_SHA_H

#include <stddef.h>
#include <stdint.h>

#ifdef _WIN32
  #ifdef SHA256_EXPORTS
    #define SHA256_API __declspec(dllexport)
  #else
    #define SHA256_API __declspec(dllimport)
  #endif
#else
  #define SHA256_API
#endif

#ifdef __cplusplus
extern "C" {
#endif

typedef uint32_t sha256_digest_t[8];

SHA256_API int TestHello(void);

/*
 * Returns NULL (0) on success according to assembly comments.
 * data_addr      - pointer to current data chunk.
 * full_size      - total message/file size in bytes.
 * current_size   - current chunk size in bytes.
 * digest         - 32-byte state/result buffer (8 x uint32_t).
 * is_last_chunk  - 1 if this is the last chunk, otherwise 0.
 */
SHA256_API void *Sha256(
    const void *data_addr,
    uint64_t full_size,
    uint64_t current_size,
    sha256_digest_t digest,
    uint64_t is_last_chunk
);

/* Initializes digest and internal K constants. */
SHA256_API void Sha256Init(sha256_digest_t digest);

#ifdef __cplusplus
}
#endif

#endif /* SHA256_SHA_H */