release/src/router/nettle/buffer.h

   1 /* buffer.h
   2  *
   3  * A bare-bones string stream.
   4  */
   5
   6 /* nettle, low-level cryptographics library
   7  *
   8  * Copyright (C) 2002 Niels Möller
   9  *
  10  * The nettle library is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 of the License, or (at your
  13  * option) any later version.
  14  *
  15  * The nettle library is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  17  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  18  * License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with the nettle library; see the file COPYING.LIB.  If not, write to
  22  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  23  * MA 02111-1301, USA.
  24  */
  25
  26 #ifndef NETTLE_BUFFER_H_INCLUDED
  27 #define NETTLE_BUFFER_H_INCLUDED
  28
  29 #include "realloc.h"
  30
  31 #ifdef __cplusplus
  32 extern "C" {
  33 #endif
  34
  35 struct nettle_buffer
  36 {
  37   uint8_t *contents;
  38   /* Allocated size */
  39   unsigned alloc;
  40
  41   void *realloc_ctx;
  42   nettle_realloc_func *realloc;
  43
  44   /* Current size */
  45   unsigned size;
  46 };
  47
  48 /* Initializes a buffer that uses plain realloc */
  49 void
  50 nettle_buffer_init(struct nettle_buffer *buffer);
  51
  52 void
  53 nettle_buffer_init_realloc(struct nettle_buffer *buffer,
  54                            void *realloc_ctx,
  55                            nettle_realloc_func *realloc);
  56
  57 /* Initializes a buffer of fix size */
  58 void
  59 nettle_buffer_init_size(struct nettle_buffer *buffer,
  60                         unsigned length, uint8_t *space);
  61
  62 void
  63 nettle_buffer_clear(struct nettle_buffer *buffer);
  64
  65 /* Resets the buffer, without freeing the buffer space. */
  66 void
  67 nettle_buffer_reset(struct nettle_buffer *buffer);
  68
  69 int
  70 nettle_buffer_grow(struct nettle_buffer *buffer,
  71                    unsigned length);
  72
  73 #define NETTLE_BUFFER_PUTC(buffer, c) \
  74 ( (((buffer)->size < (buffer)->alloc) || nettle_buffer_grow((buffer), 1)) \
  75   && ((buffer)->contents[(buffer)->size++] = (c), 1) )
  76
  77 int
  78 nettle_buffer_write(struct nettle_buffer *buffer,
  79                     unsigned length, const uint8_t *data);
  80
  81 /* Like nettle_buffer_write, but instead of copying data to the
  82  * buffer, it returns a pointer to the area where the caller can copy
  83  * the data. The pointer is valid only until the next call that can
  84  * reallocate the buffer. */
  85 uint8_t *
  86 nettle_buffer_space(struct nettle_buffer *buffer,
  87                     unsigned length);
  88
  89 /* Copy the contents of SRC to the end of DST. */
  90 int
  91 nettle_buffer_copy(struct nettle_buffer *dst,
  92                    const struct nettle_buffer *src);
  93
  94 #ifdef __cplusplus
  95 }
  96 #endif
  97
  98 #endif /* NETTLE_BUFFER_H_INCLUDED */