comp.h revision 306195 
1
2#ifndef HEADER_COMP_H
3# define HEADER_COMP_H
4
5# include <openssl/crypto.h>
6
7# ifdef OPENSSL_NO_COMP
8#  error COMP is disabled.
9# endif
10
11#ifdef  __cplusplus
12extern "C" {
13#endif
14
15typedef struct comp_ctx_st COMP_CTX;
16
17struct comp_method_st {
18    int type;                   /* NID for compression library */
19    const char *name;           /* A text string to identify the library */
20    int (*init) (COMP_CTX *ctx);
21    void (*finish) (COMP_CTX *ctx);
22    int (*compress) (COMP_CTX *ctx,
23                     unsigned char *out, unsigned int olen,
24                     unsigned char *in, unsigned int ilen);
25    int (*expand) (COMP_CTX *ctx,
26                   unsigned char *out, unsigned int olen,
27                   unsigned char *in, unsigned int ilen);
28    /*
29     * The following two do NOTHING, but are kept for backward compatibility
30     */
31    long (*ctrl) (void);
32    long (*callback_ctrl) (void);
33};
34
35struct comp_ctx_st {
36    COMP_METHOD *meth;
37    unsigned long compress_in;
38    unsigned long compress_out;
39    unsigned long expand_in;
40    unsigned long expand_out;
41    CRYPTO_EX_DATA ex_data;
42};
43
44COMP_CTX *COMP_CTX_new(COMP_METHOD *meth);
45void COMP_CTX_free(COMP_CTX *ctx);
46int COMP_compress_block(COMP_CTX *ctx, unsigned char *out, int olen,
47                        unsigned char *in, int ilen);
48int COMP_expand_block(COMP_CTX *ctx, unsigned char *out, int olen,
49                      unsigned char *in, int ilen);
50COMP_METHOD *COMP_rle(void);
51COMP_METHOD *COMP_zlib(void);
52void COMP_zlib_cleanup(void);
53
54# ifdef HEADER_BIO_H
55#  ifdef ZLIB
56BIO_METHOD *BIO_f_zlib(void);
57#  endif
58# endif
59
60/* BEGIN ERROR CODES */
61/*
62 * The following lines are auto generated by the script mkerr.pl. Any changes
63 * made after this point may be overwritten when the script is next run.
64 */
65void ERR_load_COMP_strings(void);
66
67/* Error codes for the COMP functions. */
68
69/* Function codes. */
70# define COMP_F_BIO_ZLIB_FLUSH                            99
71# define COMP_F_BIO_ZLIB_NEW                              100
72# define COMP_F_BIO_ZLIB_READ                             101
73# define COMP_F_BIO_ZLIB_WRITE                            102
74
75/* Reason codes. */
76# define COMP_R_ZLIB_DEFLATE_ERROR                        99
77# define COMP_R_ZLIB_INFLATE_ERROR                        100
78# define COMP_R_ZLIB_NOT_SUPPORTED                        101
79
80#ifdef  __cplusplus
81}
82#endif
83#endif
84