143 lines
3.0 KiB
C
143 lines
3.0 KiB
C
/* GLIB - Library of useful routines for C programming
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <string.h>
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#include "glib.h"
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#define MIN_ARRAY_SIZE 16
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typedef struct _GRealArray GRealArray;
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struct _GRealArray
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{
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guint8 *data;
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guint len;
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guint alloc;
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guint zero_terminated;
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};
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static gint g_nearest_pow (gint num);
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static void g_array_maybe_expand (GRealArray *array,
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gint len);
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static GMemChunk *array_mem_chunk = NULL;
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GArray*
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g_array_new (zero_terminated)
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{
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GRealArray *array;
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if (!array_mem_chunk)
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array_mem_chunk = g_mem_chunk_new ("array mem chunk",
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sizeof (GRealArray),
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1024, G_ALLOC_AND_FREE);
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array = g_chunk_new (GRealArray, array_mem_chunk);
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array->data = NULL;
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array->len = 0;
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array->alloc = 0;
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array->zero_terminated = (zero_terminated ? 1 : 0);
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return (GArray*) array;
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}
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void
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g_array_free (GArray *array,
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gint free_segment)
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{
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if (free_segment)
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g_free (array->data);
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g_mem_chunk_free (array_mem_chunk, array);
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}
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GArray*
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g_rarray_append (GArray *array,
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gpointer data,
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gint size)
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{
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g_array_maybe_expand ((GRealArray*) array, size);
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memcpy (array->data + array->len, data, size);
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array->len += size;
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return array;
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}
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GArray*
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g_rarray_prepend (GArray *array,
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gpointer data,
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gint size)
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{
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g_array_maybe_expand ((GRealArray*) array, size);
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g_memmove (array->data + size, array->data, array->len);
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memcpy (array->data, data, size);
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array->len += size;
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return array;
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}
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GArray*
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g_rarray_truncate (GArray *array,
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gint length,
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gint size)
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{
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if (array->data)
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memset (array->data + length * size, 0, size);
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array->len = length;
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return array;
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}
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static gint
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g_nearest_pow (gint num)
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{
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gint n = 1;
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while (n < num)
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n <<= 1;
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return n;
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}
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static void
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g_array_maybe_expand (GRealArray *array,
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gint len)
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{
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guint old_alloc;
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if ((array->len + len) > array->alloc)
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{
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old_alloc = array->alloc;
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array->alloc = g_nearest_pow (array->len + array->zero_terminated + len);
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array->alloc = MAX (array->alloc, MIN_ARRAY_SIZE);
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array->data = g_realloc (array->data, array->alloc);
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memset (array->data + old_alloc, 0, array->alloc - old_alloc);
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}
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}
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