added a memory checking test program, used to

solve the memory leak reported by Jack Davis
This commit is contained in:
David Turner 2000-02-21 16:18:25 +00:00
parent c64f644264
commit fbff3e8fc7

174
demos/src/memtest.c Normal file
View File

@ -0,0 +1,174 @@
/* memtest.c */
#include <freetype.h>
#include <ftobjs.h>
#include <stdio.h>
#include <stdlib.h>
EXPORT_DEF
void FT_Default_Drivers( FT_Library library );
/* Our own memory allocator. To check that a single block isn't freed */
/* several time, we simply do not call "free".. */
#define MAX_RECORDED_BLOCKS 4096
#define CHECK_DUPLICATES
typedef struct MyBlock
{
void* base;
long size;
} MyBlock;
static MyBlock my_blocks[ MAX_RECORDED_BLOCKS ];
static int num_my_blocks = 0;
/* record a new block in the table, check for duplicates too */
static
void record_my_block( void* base, long size )
{
if (size <= 0)
{
fprintf( stderr, "adding a block with non-positive length - should not happen \n" );
exit(1);
}
if ( num_my_blocks < MAX_RECORDED_BLOCKS )
{
MyBlock* block;
#ifdef CHECK_DUPLICATES
MyBlock* limit;
block = my_blocks;
limit = block + num_my_blocks;
for ( ; block < limit; block++ )
{
if ( block->base == base && block->size != 0 )
{
fprintf( stderr, "duplicate memory block at %08lx\n", (long)block->base );
exit(1);
}
}
#endif
block = my_blocks + num_my_blocks++;
block->base = base;
block->size = size;
}
else
{
fprintf( stderr, "Too many memory blocks -- test exited !!\n" );
exit(1);
}
}
/* forget a block, and check that it isn't part of our table already */
static
void forget_my_block( void* base )
{
MyBlock* block = my_blocks + num_my_blocks-1;
/* we scan in reverse, because transient blocks are always located */
/* at the end of the table.. (it supposedly faster then..) */
for ( ; block >= my_blocks; block-- )
{
if ( block->base == base )
{
if (block->size > 0)
{
block->size = 0;
return;
}
else
{
fprintf( stderr, "Block at %08lx released twice \n", (long)base );
exit(1);
}
}
}
fprintf( stderr, "Trying to release an unallocated block at %08lx\n",
(long)base );
exit(1);
}
static
void* my_alloc( FT_Memory memory,
long size )
{
void* p = malloc(size);
if (p)
record_my_block(p,size);
return p;
}
static
void my_free( FT_Memory memory, void* block )
{
forget_my_block(block);
free(block);
}
static
void* my_realloc( FT_Memory memory,
long cur_size,
long new_size,
void* block )
{
void* p;
p = my_alloc( memory, new_size );
if (p)
{
my_free( memory, block );
record_my_block( p, new_size );
}
return p;
}
struct FT_MemoryRec_ my_memory =
{
0,
my_alloc,
my_free,
my_realloc
};
int main( void )
{
FT_Library library;
FT_Face face;
int glyphIndex;
int result;
/* Create a new library with our own memory manager */
result = FT_New_Library( &my_memory, &library );
/* the new library has no drivers in it, add the default ones */
/* (implemented in ftinit.c).. */
FT_Default_Drivers(library);
result = FT_New_Face( library, "d:/ttf/arial.ttf", 0, &face );
result = FT_Set_Char_Size( face, 0, 16*64, 96, 96 );
glyphIndex = FT_Get_Char_Index( face, (int)'A' );
/* memory error occurs in FT_DoneFreeType() if FT_Load_Glyph() is called */
result = FT_Load_Glyph(face, glyphIndex, FT_LOAD_DEFAULT );
result = FT_Done_Face( face );
result = FT_Done_FreeType( library );
return 0;
}