502 lines
12 KiB
C
502 lines
12 KiB
C
/***************************************************************************/
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/* */
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/* ftutil.c */
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/* */
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/* FreeType utility file for memory and list management (body). */
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/* */
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/* Copyright 2002, 2004, 2005, 2006, 2007 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#include <ft2build.h>
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_MEMORY_H
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#include FT_INTERNAL_OBJECTS_H
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#include FT_LIST_H
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/*************************************************************************/
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/* */
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/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
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/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
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/* messages during execution. */
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/* */
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_memory
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** *****/
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/***** M E M O R Y M A N A G E M E N T *****/
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/***** *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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FT_BASE_DEF( FT_Pointer )
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ft_mem_alloc( FT_Memory memory,
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FT_Long size,
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FT_Error *p_error )
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{
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FT_Error error;
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FT_Pointer block = ft_mem_qalloc( memory, size, &error );
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if ( !error && size > 0 )
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FT_MEM_ZERO( block, size );
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*p_error = error;
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return block;
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}
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FT_BASE_DEF( FT_Pointer )
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ft_mem_qalloc( FT_Memory memory,
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FT_Long size,
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FT_Error *p_error )
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{
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FT_Error error = FT_Err_Ok;
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FT_Pointer block = NULL;
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if ( size > 0 )
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{
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block = memory->alloc( memory, size );
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if ( block == NULL )
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error = FT_Err_Out_Of_Memory;
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}
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else if ( size < 0 )
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{
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/* may help catch/prevent security issues */
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error = FT_Err_Invalid_Argument;
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}
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*p_error = error;
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return block;
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}
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FT_BASE_DEF( FT_Pointer )
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ft_mem_realloc( FT_Memory memory,
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FT_Long item_size,
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FT_Long cur_count,
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FT_Long new_count,
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void* block,
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FT_Error *p_error )
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{
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FT_Error error = FT_Err_Ok;
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block = ft_mem_qrealloc( memory, item_size,
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cur_count, new_count, block, &error );
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if ( !error && new_count > cur_count )
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FT_MEM_ZERO( (char*)block + cur_count * item_size,
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( new_count - cur_count ) * item_size );
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*p_error = error;
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return block;
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}
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FT_BASE_DEF( FT_Pointer )
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ft_mem_qrealloc( FT_Memory memory,
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FT_Long item_size,
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FT_Long cur_count,
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FT_Long new_count,
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void* block,
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FT_Error *p_error )
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{
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FT_Error error = FT_Err_Ok;
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/* Note that we now accept `item_size == 0' as a valid parameter, in
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* order to cover very weird cases where an ALLOC_MULT macro would be
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* called.
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*/
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if ( cur_count < 0 || new_count < 0 || item_size < 0 )
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{
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/* may help catch/prevent nasty security issues */
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error = FT_Err_Invalid_Argument;
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}
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else if ( new_count == 0 || item_size == 0 )
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{
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ft_mem_free( memory, block );
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block = NULL;
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}
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else if ( new_count > FT_INT_MAX/item_size )
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{
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error = FT_Err_Array_Too_Large;
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}
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else if ( cur_count == 0 )
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{
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FT_ASSERT( block == NULL );
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block = ft_mem_alloc( memory, new_count*item_size, &error );
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}
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else
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{
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FT_Pointer block2;
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FT_Long cur_size = cur_count*item_size;
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FT_Long new_size = new_count*item_size;
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block2 = memory->realloc( memory, cur_size, new_size, block );
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if ( block2 == NULL )
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error = FT_Err_Out_Of_Memory;
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else
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block = block2;
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}
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*p_error = error;
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return block;
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}
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FT_BASE_DEF( void )
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ft_mem_free( FT_Memory memory,
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const void *P )
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{
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if ( P )
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memory->free( memory, (void*)P );
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}
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FT_BASE_DEF( FT_Pointer )
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ft_mem_dup( FT_Memory memory,
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const void* address,
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FT_ULong size,
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FT_Error *p_error )
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{
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FT_Error error;
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FT_Pointer p = ft_mem_qalloc( memory, size, &error );
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if ( !error && address )
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ft_memcpy( p, address, size );
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*p_error = error;
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return p;
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}
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FT_BASE_DEF( FT_Pointer )
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ft_mem_strdup( FT_Memory memory,
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const char* str,
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FT_Error *p_error )
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{
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FT_ULong len = str ? (FT_ULong)ft_strlen( str ) + 1
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: 0;
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return ft_mem_dup( memory, str, len, p_error );
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}
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FT_BASE_DEF( FT_Int )
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ft_mem_strcpyn( char* dst,
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const char* src,
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FT_ULong size )
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{
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while ( size > 1 && *src != 0 )
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{
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*dst++ = *src++;
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size--;
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}
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*dst = 0; /* always zero-terminate */
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return *src != 0;
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}
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** *****/
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/***** D O U B L Y L I N K E D L I S T S *****/
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/***** *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_list
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/* documentation is in ftlist.h */
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FT_EXPORT_DEF( FT_ListNode )
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FT_List_Find( FT_List list,
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void* data )
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{
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FT_ListNode cur;
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cur = list->head;
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while ( cur )
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{
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if ( cur->data == data )
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return cur;
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cur = cur->next;
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}
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return (FT_ListNode)0;
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}
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/* documentation is in ftlist.h */
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FT_EXPORT_DEF( void )
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FT_List_Add( FT_List list,
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FT_ListNode node )
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{
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FT_ListNode before = list->tail;
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node->next = 0;
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node->prev = before;
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if ( before )
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before->next = node;
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else
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list->head = node;
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list->tail = node;
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}
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/* documentation is in ftlist.h */
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FT_EXPORT_DEF( void )
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FT_List_Insert( FT_List list,
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FT_ListNode node )
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{
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FT_ListNode after = list->head;
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node->next = after;
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node->prev = 0;
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if ( !after )
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list->tail = node;
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else
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after->prev = node;
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list->head = node;
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}
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/* documentation is in ftlist.h */
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FT_EXPORT_DEF( void )
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FT_List_Remove( FT_List list,
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FT_ListNode node )
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{
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FT_ListNode before, after;
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before = node->prev;
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after = node->next;
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if ( before )
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before->next = after;
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else
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list->head = after;
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if ( after )
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after->prev = before;
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else
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list->tail = before;
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}
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/* documentation is in ftlist.h */
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FT_EXPORT_DEF( void )
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FT_List_Up( FT_List list,
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FT_ListNode node )
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{
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FT_ListNode before, after;
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before = node->prev;
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after = node->next;
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/* check whether we are already on top of the list */
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if ( !before )
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return;
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before->next = after;
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if ( after )
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after->prev = before;
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else
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list->tail = before;
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node->prev = 0;
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node->next = list->head;
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list->head->prev = node;
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list->head = node;
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}
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/* documentation is in ftlist.h */
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FT_EXPORT_DEF( FT_Error )
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FT_List_Iterate( FT_List list,
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FT_List_Iterator iterator,
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void* user )
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{
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FT_ListNode cur = list->head;
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FT_Error error = FT_Err_Ok;
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while ( cur )
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{
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FT_ListNode next = cur->next;
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error = iterator( cur, user );
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if ( error )
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break;
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cur = next;
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}
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return error;
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}
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/* documentation is in ftlist.h */
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FT_EXPORT_DEF( void )
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FT_List_Finalize( FT_List list,
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FT_List_Destructor destroy,
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FT_Memory memory,
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void* user )
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{
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FT_ListNode cur;
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cur = list->head;
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while ( cur )
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{
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FT_ListNode next = cur->next;
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void* data = cur->data;
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if ( destroy )
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destroy( memory, data, user );
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FT_FREE( cur );
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cur = next;
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}
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list->head = 0;
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list->tail = 0;
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}
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FT_BASE_DEF( FT_UInt32 )
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ft_highpow2( FT_UInt32 value )
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{
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FT_UInt32 value2;
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/*
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* We simply clear the lowest bit in each iteration. When
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* we reach 0, we know that the previous value was our result.
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*/
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for ( ;; )
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{
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value2 = value & (value - 1); /* clear lowest bit */
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if ( value2 == 0 )
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break;
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value = value2;
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}
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return value;
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}
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#ifdef FT_CONFIG_OPTION_OLD_INTERNALS
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FT_BASE_DEF( FT_Error )
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FT_Alloc( FT_Memory memory,
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FT_Long size,
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void* *P )
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{
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FT_Error error;
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(void)FT_ALLOC( *P, size );
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return error;
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}
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FT_BASE_DEF( FT_Error )
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FT_QAlloc( FT_Memory memory,
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FT_Long size,
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void* *p )
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{
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FT_Error error;
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(void)FT_QALLOC( *p, size );
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return error;
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}
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FT_BASE_DEF( FT_Error )
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FT_Realloc( FT_Memory memory,
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FT_Long current,
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FT_Long size,
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void* *P )
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{
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FT_Error error;
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(void)FT_REALLOC( *P, current, size );
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return error;
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}
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FT_BASE_DEF( FT_Error )
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FT_QRealloc( FT_Memory memory,
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FT_Long current,
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FT_Long size,
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void* *p )
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{
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FT_Error error;
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(void)FT_QREALLOC( *p, current, size );
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return error;
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}
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FT_BASE_DEF( void )
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FT_Free( FT_Memory memory,
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void* *P )
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{
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if ( *P )
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FT_MEM_FREE( *P );
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}
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#endif /* FT_CONFIG_OPTION_OLD_INTERNALS */
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/* END */
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