2G ems initial

include/nettle/buffer.h

@@ -0,0 +1,106 @@
+/* buffer.h
+
+   A bare-bones string stream.
+
+   Copyright (C) 2002 Niels Möller
+
+   This file is part of GNU Nettle.
+
+   GNU Nettle is free software: you can redistribute it and/or
+   modify it under the terms of either:
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at your
+       option) any later version.
+
+   or
+
+     * 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.
+
+   or both in parallel, as here.
+
+   GNU Nettle 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.
+
+   You should have received copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see http://www.gnu.org/licenses/.
+*/
+ 
+#ifndef NETTLE_BUFFER_H_INCLUDED
+#define NETTLE_BUFFER_H_INCLUDED
+
+#include "realloc.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct nettle_buffer
+{
+  uint8_t *contents;
+  /* Allocated size */
+  size_t alloc;
+
+  void *realloc_ctx;
+  nettle_realloc_func *realloc;
+
+  /* Current size */
+  size_t size;
+};
+
+/* Initializes a buffer that uses plain realloc */
+void
+nettle_buffer_init(struct nettle_buffer *buffer);
+
+void
+nettle_buffer_init_realloc(struct nettle_buffer *buffer,
+			   void *realloc_ctx,
+			   nettle_realloc_func *realloc);
+
+/* Initializes a buffer of fix size */
+void
+nettle_buffer_init_size(struct nettle_buffer *buffer,
+			size_t length, uint8_t *space);
+
+void
+nettle_buffer_clear(struct nettle_buffer *buffer);
+
+/* Resets the buffer, without freeing the buffer space. */
+void
+nettle_buffer_reset(struct nettle_buffer *buffer);
+
+int
+nettle_buffer_grow(struct nettle_buffer *buffer,
+		   size_t length);
+
+#define NETTLE_BUFFER_PUTC(buffer, c) \
+( (((buffer)->size < (buffer)->alloc) || nettle_buffer_grow((buffer), 1)) \
+  && ((buffer)->contents[(buffer)->size++] = (c), 1) )
+
+int
+nettle_buffer_write(struct nettle_buffer *buffer,
+		    size_t length, const uint8_t *data);
+
+/* Like nettle_buffer_write, but instead of copying data to the
+ * buffer, it returns a pointer to the area where the caller can copy
+ * the data. The pointer is valid only until the next call that can
+ * reallocate the buffer. */
+uint8_t *
+nettle_buffer_space(struct nettle_buffer *buffer,
+		    size_t length);
+
+/* Copy the contents of SRC to the end of DST. */
+int
+nettle_buffer_copy(struct nettle_buffer *dst,
+		   const struct nettle_buffer *src);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NETTLE_BUFFER_H_INCLUDED */