project_files/frontlib/util/buffer.h
author unc0rr
Fri, 04 Jan 2013 21:44:40 +0400
branchflibqtfrontend
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/*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2
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 * of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
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 */
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#ifndef BUFFER_H_
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#define BUFFER_H_
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#include <stdint.h>
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#include <stddef.h>
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/**
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 * A simple struct to hold both the pointer to an array and its size,
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 * for e.g. conveniently returning it from a function.
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 *
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 * Convention: Size is zero iff data is a NULL pointer.
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 */
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typedef struct {
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	void *data;
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	size_t size;
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} flib_buffer;
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/**
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 * Just like flib_buffer, but the contents are not supposed to be modified.
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 */
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typedef struct {
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	const void *data;
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	size_t size;
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} flib_constbuffer;
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/**
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 * Simple variable-capacity data structure that can be efficiently appended to.
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 */
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typedef struct _flib_vector flib_vector;
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/**
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 * Create a new vector. Needs to be destroyed again later with flib_vector_destroy.
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 * May return NULL if memory runs out.
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 */
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flib_vector *flib_vector_create();
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/**
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 * Free the memory of this vector
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 */
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void flib_vector_destroy(flib_vector *vec);
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/**
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 * Resize the vector. This changes the size, and ensures the capacity is large enough to
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 * for the new size. Can also free memory if the new size is smaller. There is no guarantee
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 * about the contents of extra memory.
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 */
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int flib_vector_resize(flib_vector *vec, size_t newSize);
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/**
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 * Append the provided data to the end of the vector, enlarging it as required.
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 * The vector remains unchanged if appending fails.
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 * Returns 0 on success.
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 */
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int flib_vector_append(flib_vector *vec, const void *data, size_t len);
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/**
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 * Append data from a format string to the buffer (without trailing 0)
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 * Returns 0 on success.
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 */
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int flib_vector_appendf(flib_vector *vec, const char *template, ...);
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/**
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 * Return a pointer to the current data buffer of the vector. This pointer can
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 * become invalid if the vector size or capacity is changed.
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 */
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void *flib_vector_data(flib_vector *vec);
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/**
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 * Return the current size of the vector.
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 */
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size_t flib_vector_size(flib_vector *vec);
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/**
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 * Return a buffer pointing to the current contents of the vector.
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 * These will become invalid if the vector size or capacity is changed.
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 */
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flib_buffer flib_vector_as_buffer(flib_vector *vec);
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/**
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 * Return a constbuffer pointing to the current contents of the vector.
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 * These will become invalid if the vector size or capacity is changed.
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 */
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flib_constbuffer flib_vector_as_constbuffer(flib_vector *vec);
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#endif