1 files changed, 154 insertions, 0 deletions
diff --git a/src/libstrongswan/chunk.h b/src/libstrongswan/chunk.h
new file mode 100644
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+++ b/src/libstrongswan/chunk.h
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+/**
+ * @file chunk.h
+ *
+ * @brief Pointer/length abstraction and its functions.
+ *
+ */
+
+/*
+ * Copyright (C) 2005-2006 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.
+ */
+
+#ifndef CHUNK_H_
+#define CHUNK_H_
+
+#include <string.h>
+#include <stdarg.h>
+
+#include <library.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"
+ */
+chunk_t chunk_create(u_char *ptr, size_t len);
+
+/**
+ * Create a clone of a chunk pointing to "ptr"
+ */
+chunk_t chunk_create_clone(u_char *ptr, chunk_t chunk);
+
+/**
+ * Calculate length of multiple chunks
+ */
+size_t chunk_length(const char *mode, ...);
+
+/**
+ * Concatenate chunks into a chunk pointing to "ptr",
+ * "mode" is a string of "c" (copy) and "m" (move), which says
+ * how to handle to chunks in "..."
+ */
+chunk_t chunk_create_cat(u_char *ptr, const char* mode, ...);
+
+/**
+ * Split up a chunk into parts, "mode" is a string of "a" (alloc),
+ * "c" (copy) and "m" (move). Each letter say for the corresponding chunk if
+ * it should get allocated on heap, copied into existing chunk, or the chunk
+ * should point into "chunk". The length of each part is an argument before
+ * each target chunk. E.g.:
+ * chunk_split(chunk, "mcac", 3, &a, 7, &b, 5, &c, d.len, &d);
+ */
+void chunk_split(chunk_t chunk, const char *mode, ...);
+
+/**
+  * Write the binary contents of a chunk_t to a file
+  */
+bool chunk_write(chunk_t chunk, const char *path, const char *label, mode_t mask, bool force);
+
+/**
+ * Free contents of a chunk
+ */
+void chunk_free(chunk_t *chunk);
+
+/**
+ * Initialize a chunk to point to buffer inspectable by sizeof()
+ */
+#define chunk_from_buf(str) { str, sizeof(str) }
+
+/**
+ * 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) chunk_create(malloc(bytes), bytes)
+
+/**
+ * Allocate a chunk on the stack
+ */
+#define chunk_alloca(bytes) chunk_create(alloca(bytes), bytes)
+
+/**
+ * Clone a chunk on heap
+ */
+#define chunk_clone(chunk) chunk_create_clone(malloc(chunk.len), chunk)
+
+/**
+ * Clone a chunk on stack
+ */
+#define chunk_clonea(chunk) chunk_create_clone(alloca(chunk.len), chunk)
+
+/**
+ * Concatenate chunks into a chunk on heap
+ */
+#define chunk_cat(mode, ...) chunk_create_cat(malloc(chunk_length(mode, __VA_ARGS__)), mode, __VA_ARGS__)
+
+/**
+ * Concatenate chunks into a chunk on stack
+ */
+#define chunk_cata(mode, ...) chunk_create_cat(alloca(chunk_length(mode, __VA_ARGS__)), mode, __VA_ARGS__)
+
+/**
+ * Skip n bytes in chunk (forward pointer, shorten length)
+ */
+chunk_t chunk_skip(chunk_t chunk, size_t bytes);
+
+/**
+ *  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.
+ */
+bool chunk_equals(chunk_t a, chunk_t b);
+
+/**
+ * Compare two chunks for equality,
+ * NULL chunks are always equal.
+ */
+bool chunk_equals_or_null(chunk_t a, chunk_t b);
+
+#endif /* CHUNK_H_ */