crypto/openssh/buffer.h

   1 /* $OpenBSD: buffer.h,v 1.17 2008/05/08 06:59:01 markus Exp $ */
   2
   3 /*
   4  * Author: Tatu Ylonen <ylo@cs.hut.fi>
   5  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
   6  *                    All rights reserved
   7  * Code for manipulating FIFO buffers.
   8  *
   9  * As far as I am concerned, the code I have written for this software
  10  * can be used freely for any purpose.  Any derived versions of this
  11  * software must be clearly marked as such, and if the derived work is
  12  * incompatible with the protocol description in the RFC file, it must be
  13  * called by a name other than "ssh" or "Secure Shell".
  14  */
  15
  16 #ifndef BUFFER_H
  17 #define BUFFER_H
  18
  19 /* move the following to a more appropriate place and name */
  20 #define BUFFER_MAX_LEN_HPN          0x4000000  /* 64MB */
  21
  22 typedef struct {
  23         u_char  *buf;           /* Buffer for data. */
  24         u_int    alloc;         /* Number of bytes allocated for data. */
  25         u_int    offset;        /* Offset of first byte containing data. */
  26         u_int    end;           /* Offset of last byte containing data. */
  27 }       Buffer;
  28
  29 void     buffer_init(Buffer *);
  30 void     buffer_clear(Buffer *);
  31 void     buffer_free(Buffer *);
  32
  33 u_int    buffer_len(Buffer *);
  34 void    *buffer_ptr(Buffer *);
  35
  36 void     buffer_append(Buffer *, const void *, u_int);
  37 void    *buffer_append_space(Buffer *, u_int);
  38
  39 int      buffer_check_alloc(Buffer *, u_int);
  40
  41 void     buffer_get(Buffer *, void *, u_int);
  42
  43 void     buffer_consume(Buffer *, u_int);
  44 void     buffer_consume_end(Buffer *, u_int);
  45
  46 void     buffer_dump(Buffer *);
  47
  48 int      buffer_get_ret(Buffer *, void *, u_int);
  49 int      buffer_consume_ret(Buffer *, u_int);
  50 int      buffer_consume_end_ret(Buffer *, u_int);
  51
  52 #include <openssl/bn.h>
  53
  54 void    buffer_put_bignum(Buffer *, const BIGNUM *);
  55 void    buffer_put_bignum2(Buffer *, const BIGNUM *);
  56 void    buffer_get_bignum(Buffer *, BIGNUM *);
  57 void    buffer_get_bignum2(Buffer *, BIGNUM *);
  58
  59 u_short buffer_get_short(Buffer *);
  60 void    buffer_put_short(Buffer *, u_short);
  61
  62 u_int   buffer_get_int(Buffer *);
  63 void    buffer_put_int(Buffer *, u_int);
  64
  65 u_int64_t buffer_get_int64(Buffer *);
  66 void    buffer_put_int64(Buffer *, u_int64_t);
  67
  68 int     buffer_get_char(Buffer *);
  69 void    buffer_put_char(Buffer *, int);
  70
  71 void   *buffer_get_string(Buffer *, u_int *);
  72 void   *buffer_get_string_ptr(Buffer *, u_int *);
  73 void    buffer_put_string(Buffer *, const void *, u_int);
  74 void    buffer_put_cstring(Buffer *, const char *);
  75
  76 #define buffer_skip_string(b) \
  77     do { u_int l = buffer_get_int(b); buffer_consume(b, l); } while (0)
  78
  79 int     buffer_put_bignum_ret(Buffer *, const BIGNUM *);
  80 int     buffer_get_bignum_ret(Buffer *, BIGNUM *);
  81 int     buffer_put_bignum2_ret(Buffer *, const BIGNUM *);
  82 int     buffer_get_bignum2_ret(Buffer *, BIGNUM *);
  83 int     buffer_get_short_ret(u_short *, Buffer *);
  84 int     buffer_get_int_ret(u_int *, Buffer *);
  85 int     buffer_get_int64_ret(u_int64_t *, Buffer *);
  86 void    *buffer_get_string_ret(Buffer *, u_int *);
  87 int     buffer_get_char_ret(char *, Buffer *);
  88
  89 #endif                          /* BUFFER_H */