1 /* $OpenBSD: comp.h,v 1.7 2014/06/12 15:49:28 deraadt Exp $ */ 2 3 #ifndef HEADER_COMP_H 4 #define HEADER_COMP_H 5 6 #include <openssl/crypto.h> 7 8 #ifdef __cplusplus 9 extern "C" { 10 #endif 11 12 typedef struct comp_ctx_st COMP_CTX; 13 14 typedef struct comp_method_st { 15 int type; /* NID for compression library */ 16 const char *name; /* A text string to identify the library */ 17 int (*init)(COMP_CTX *ctx); 18 void (*finish)(COMP_CTX *ctx); 19 int (*compress)(COMP_CTX *ctx, unsigned char *out, unsigned int olen, 20 unsigned char *in, unsigned int ilen); 21 int (*expand)(COMP_CTX *ctx, unsigned char *out, unsigned int olen, 22 unsigned char *in, unsigned int ilen); 23 /* The following two do NOTHING, but are kept for backward compatibility */ 24 long (*ctrl)(void); 25 long (*callback_ctrl)(void); 26 } COMP_METHOD; 27 28 struct comp_ctx_st { 29 COMP_METHOD *meth; 30 unsigned long compress_in; 31 unsigned long compress_out; 32 unsigned long expand_in; 33 unsigned long expand_out; 34 35 CRYPTO_EX_DATA ex_data; 36 }; 37 38 39 COMP_CTX *COMP_CTX_new(COMP_METHOD *meth); 40 void COMP_CTX_free(COMP_CTX *ctx); 41 int COMP_compress_block(COMP_CTX *ctx, unsigned char *out, int olen, 42 unsigned char *in, int ilen); 43 int COMP_expand_block(COMP_CTX *ctx, unsigned char *out, int olen, 44 unsigned char *in, int ilen); 45 COMP_METHOD *COMP_rle(void ); 46 COMP_METHOD *COMP_zlib(void ); 47 void COMP_zlib_cleanup(void); 48 49 #ifdef HEADER_BIO_H 50 #ifdef ZLIB 51 BIO_METHOD *BIO_f_zlib(void); 52 #endif 53 #endif 54 55 void ERR_load_COMP_strings(void); 56 57 /* Error codes for the COMP functions. */ 58 59 /* Function codes. */ 60 #define COMP_F_BIO_ZLIB_FLUSH 99 61 #define COMP_F_BIO_ZLIB_NEW 100 62 #define COMP_F_BIO_ZLIB_READ 101 63 #define COMP_F_BIO_ZLIB_WRITE 102 64 65 /* Reason codes. */ 66 #define COMP_R_ZLIB_DEFLATE_ERROR 99 67 #define COMP_R_ZLIB_INFLATE_ERROR 100 68 #define COMP_R_ZLIB_NOT_SUPPORTED 101 69 70 #ifdef __cplusplus 71 } 72 #endif 73 #endif 74