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/*
* Copyright (C) 2008-2009 Tobias Brunner
* Copyright (C) 2005-2008 Martin Willi
* Copyright (C) 2005 Jan Hutter
* Hochschule fuer Technik Rapperswil
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
/**
* @defgroup chunk chunk
* @{ @ingroup libstrongswan
*/
#ifndef CHUNK_H_
#define CHUNK_H_
typedef struct chunk_t chunk_t;
/**
* General purpose pointer/length abstraction.
*/
struct chunk_t {
/** Pointer to start of data */
u_char *ptr;
/** Length of data in bytes */
size_t len;
};
/**
* A { NULL, 0 }-chunk handy for initialization.
*/
extern chunk_t chunk_empty;
/**
* Create a new chunk pointing to "ptr" with length "len"
*/
static inline chunk_t chunk_create(u_char *ptr, size_t len)
{
chunk_t chunk = {ptr, len};
return chunk;
}
/**
* Free contents of a chunk
*/
static inline void chunk_free(chunk_t *chunk)
{
free(chunk->ptr);
*chunk = chunk_empty;
}
/**
* Overwrite the contents of a chunk and free it
*/
static inline void chunk_clear(chunk_t *chunk)
{
if (chunk->ptr)
{
memset(chunk->ptr, 0, chunk->len);
chunk_free(chunk);
}
}
/**
* Initialize a chunk using a char array
*/
#define chunk_from_chars(...) ((chunk_t){(char[]){__VA_ARGS__}, sizeof((char[]){__VA_ARGS__})})
/**
* Initialize a chunk to point to a thing
*/
#define chunk_from_thing(thing) chunk_create((char*)&(thing), sizeof(thing))
/**
* Allocate a chunk on the heap
*/
#define chunk_alloc(bytes) ({size_t x = (bytes); chunk_create(x ? malloc(x) : NULL, x);})
/**
* Allocate a chunk on the stack
*/
#define chunk_alloca(bytes) ({size_t x = (bytes); chunk_create(x ? alloca(x) : NULL, x);})
/**
* Clone a chunk on heap
*/
#define chunk_clone(chunk) ({chunk_t x = (chunk); chunk_create_clone(x.len ? malloc(x.len) : NULL, x);})
/**
* Skip n bytes in chunk (forward pointer, shorten length)
*/
static inline chunk_t chunk_skip(chunk_t chunk, size_t bytes)
{
if (chunk.len > bytes)
{
chunk.ptr += bytes;
chunk.len -= bytes;
return chunk;
}
return chunk_empty;
}
/**
* Skip a leading zero-valued byte
*/
static inline chunk_t chunk_skip_zero(chunk_t chunk)
{
if (chunk.len > 1 && *chunk.ptr == 0x00)
{
chunk.ptr++;
chunk.len--;
}
return chunk;
}
/**
* Compare two chunks, returns zero if a equals b
* or negative/positive if a is small/greater than b
*/
int chunk_compare(chunk_t a, chunk_t b);
/**
* Compare two chunks for equality,
* NULL chunks are never equal.
*/
static inline bool chunk_equals(chunk_t a, chunk_t b)
{
return a.ptr != NULL && b.ptr != NULL &&
a.len == b.len && memeq(a.ptr, b.ptr, a.len);
}
/**
* Compare two chunks (given as pointers) for equality (useful as callback),
* NULL chunks are never equal.
*/
static inline bool chunk_equals_ptr(chunk_t *a, chunk_t *b)
{
return a != NULL && b != NULL && chunk_equals(*a, *b);
}
/**
* Check if a chunk has printable characters only.
*
* If sane is given, chunk is cloned into sane and all non printable characters
* get replaced by "replace".
*
* @param chunk chunk to check for printability
* @param sane pointer where sane version is allocated, or NULL
* @param replace character to use for replaceing unprintable characters
* @return TRUE if all characters in chunk are printable
*/
bool chunk_printable(chunk_t chunk, chunk_t *sane, char replace);
#endif
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