+++ /dev/null
-/*
-
- silcbuffer.c
-
- Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
-
- Copyright (C) 1998 - 2000 Pekka Riikonen
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
-*/
-/*
- * $Id$
- * $Log$
- * Revision 1.2 2000/07/05 06:06:35 priikone
- * Global cosmetic change.
- *
- * Revision 1.1.1.1 2000/06/27 11:36:55 priikone
- * Imported from internal CVS/Added Log headers.
- *
- *
- */
-
-#include "silcincludes.h"
-#include "silcbuffer.h"
-
-static unsigned char *silc_buffer_pull_i(SilcBuffer sb, unsigned int len)
-{
- return silc_buffer_pull(sb, len);
-}
-
-static unsigned char *silc_buffer_push_i(SilcBuffer sb, unsigned int len)
-{
- return silc_buffer_push(sb, len);
-}
-
-static unsigned char *silc_buffer_pull_tail_i(SilcBuffer sb, unsigned int len)
-{
- return silc_buffer_pull_tail(sb, len);
-}
-
-static unsigned char *silc_buffer_push_tail_i(SilcBuffer sb, unsigned int len)
-{
- return silc_buffer_push_tail(sb, len);
-}
-
-static unsigned char *silc_buffer_put_head_i(SilcBuffer sb,
- unsigned char *data,
- unsigned int len)
-{
- return silc_buffer_put_head(sb, data, len);
-}
-
-static unsigned char *silc_buffer_put_i(SilcBuffer sb,
- unsigned char *data,
- unsigned int len)
-{
- return silc_buffer_put(sb, data, len);
-}
-
-static unsigned char *silc_buffer_put_tail_i(SilcBuffer sb,
- unsigned char *data,
- unsigned int len)
-{
- return silc_buffer_put_tail(sb, data, len);
-}
-
-/* Allocates a new SilcBuffer and returns a pointer to it. The data
- area of the new buffer is set to the real beginning of the buffer.
-
- Buffer after allocation:
- ---------------------------------
- | |
- ---------------------------------
- ^ head, data, tail ^ end
-
-*/
-
-SilcBuffer silc_buffer_alloc(unsigned int len)
-{
- SilcBuffer sb;
- unsigned char *data;
-
- /* Allocate new SilcBuffer */
- sb = silc_calloc(1, sizeof(*sb));
-
- /* Allocate the actual data area */
- data = silc_calloc(len, sizeof(*data));
- memset(data, 0, len);
-
- /* Set pointers to the new buffer */
- sb->truelen = len;
- sb->len = 0;
- sb->head = data;
- sb->data = data;
- sb->tail = data;
- sb->end = data + sb->truelen;
-
- /* Set the function pointers */
- sb->pull = silc_buffer_pull_i;
- sb->push = silc_buffer_push_i;
- sb->pull_tail = silc_buffer_pull_tail_i;
- sb->push_tail = silc_buffer_push_tail_i;
- sb->put = silc_buffer_put_i;
- sb->put_head = silc_buffer_put_head_i;
- sb->put_tail = silc_buffer_put_tail_i;
-
- return sb;
-}
-
-/* Free's a SilcBuffer */
-
-void silc_buffer_free(SilcBuffer sb)
-{
- if (sb) {
- memset(sb->head, 'F', sb->truelen);
- silc_free(sb->head);
- silc_free(sb);
- }
-}
-
-#ifdef SILC_DEBUG /* If we are doing debugging we won't
- have the optimized inline buffer functions
- available as optimization is not set
- to compiler. These normal routines are
- used in debugging mode. */
-
-/* XXX These are currenly obsolte as SILC is compiled always with -O
- flag thus inline functions maybe used. So, fix these. */
-
-/* Pulls current data area towards end. The length of the currently
- valid data area is also decremented. Returns pointer to the data
- area before pulling.
-
- Example:
- ---------------------------------
- | head | data | tail |
- ---------------------------------
- ^
- Pulls the start of the data area.
-
- ---------------------------------
- | head | data | tail |
- ---------------------------------
- ^
-*/
-
-unsigned char *silc_buffer_pull(SilcBuffer sb, unsigned int len)
-{
- unsigned char *old_data = sb->data;
-
- assert(len <= (sb->tail - sb->data));
-
- sb->data += len;
- sb->len -= len;
-
- return old_data;
-}
-
-/* Pushes current data area towards beginning. Length of the currently
- valid data area is also incremented. Returns a pointer to the
- data area before pushing.
-
- Example:
- ---------------------------------
- | head | data | tail |
- ---------------------------------
- ^
- Pushes the start of the data area.
-
- ---------------------------------
- | head | data | tail |
- ---------------------------------
- ^
-*/
-
-unsigned char *silc_buffer_push(SilcBuffer sb, unsigned int len)
-{
- unsigned char *old_data = sb->data;
-
- assert((sb->data - len) >= sb->head);
-
- sb->data -= len;
- sb->len += len;
-
- return old_data;
-}
-
-/* Pulls current tail section towards end. Length of the current valid
- data area is also incremented. Returns a pointer to the data area
- before pulling.
-
- Example:
- ---------------------------------
- | head | data | tail |
- ---------------------------------
- ^
- Pulls the start of the tail section.
-
- ---------------------------------
- | head | data | tail |
- ---------------------------------
- ^
-*/
-
-unsigned char *silc_buffer_pull_tail(SilcBuffer sb, unsigned int len)
-{
- unsigned char *old_tail = sb->tail;
-
- assert((sb->end - sb->tail) >= len);
-
- sb->tail += len;
- sb->len += len;
-
- return old_tail;
-}
-
-/* Pushes current tail section towards beginning. Length of the current
- valid data area is also decremented. Returns a pointer to the
- tail section before pushing.
-
- Example:
- ---------------------------------
- | head | data | tail |
- ---------------------------------
- ^
- Pushes the start of the tail section.
-
- ---------------------------------
- | head | data | tail |
- ---------------------------------
- ^
-*/
-
-unsigned char *silc_buffer_push_tail(SilcBuffer sb, unsigned int len)
-{
- unsigned char *old_tail = sb->tail;
-
- assert((sb->tail - len) >= sb->data);
-
- sb->tail -= len;
- sb->len -= len;
-
- return old_tail;
-}
-
-/* Puts data at the head of the buffer. Returns pointer to the copied
- data area.
-
- Example:
- ---------------------------------
- | head | data | tail |
- ---------------------------------
- ^
- Puts data to the head section.
-*/
-
-unsigned char *silc_buffer_put_head(SilcBuffer sb,
- unsigned char *data,
- unsigned int len)
-{
- assert((sb->data - sb->head) >= len);
- return memcpy(sb->head, data, len);
-}
-
-/* Puts data at the start of the valid data area. Returns a pointer
- to the copied data area.
-
- Example:
- ---------------------------------
- | head | data | tail |
- ---------------------------------
- ^
- Puts data to the data section.
-*/
-
-unsigned char *silc_buffer_put(SilcBuffer sb,
- unsigned char *data,
- unsigned int len)
-{
- assert((sb->tail - sb->data) >= len);
- return memcpy(sb->data, data, len);
-}
-
-/* Puts data at the tail of the buffer. Returns pointer to the copied
- data area.
-
- Example:
- ---------------------------------
- | head | data | tail |
- ---------------------------------
- ^
- Puts data to the tail section.
-*/
-
-unsigned char *silc_buffer_put_tail(SilcBuffer sb,
- unsigned char *data,
- unsigned int len)
-{
- assert((sb->end - sb->tail) >= len);
- return memcpy(sb->tail, data, len);
-}
-
-#endif
projects / silc.git / blobdiff