lib/libcrypto/comp/comp.h

   1 /* $OpenBSD: comp.h,v 1.8 2014/11/03 16:58:28 tedu 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