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|
/* ftglue.c: Glue code for compiling the OpenType code from
* FreeType 1 using only the public API of FreeType 2
*
* By David Turner, The FreeType Project (www.freetype.org)
*
* This code is explicitely put in the public domain
*
* See ftglue.h for more information.
*/
#include "ftglue.h"
#if 0
#include <stdio.h>
#define LOG(x) ftglue_log x
static void
ftglue_log( const char* format, ... )
{
va_list ap;
va_start( ap, format );
vfprintf( stderr, format, ap );
va_end( ap );
}
#else
#define LOG(x) do {} while (0)
#endif
/* only used internally */
static FT_Pointer
ftglue_qalloc( FT_Memory memory,
FT_ULong size,
FT_Error *perror )
{
FT_Error error = 0;
FT_Pointer block = NULL;
if ( size > 0 )
{
block = memory->alloc( memory, size );
if ( !block )
error = FT_Err_Out_Of_Memory;
}
*perror = error;
return block;
}
#undef QALLOC /* just in case */
#define QALLOC(ptr,size) ( (ptr) = ftglue_qalloc( memory, (size), &error ), error != 0 )
#define FREE(_ptr) \
do { \
if ( (_ptr) ) \
{ \
ftglue_free( memory, _ptr ); \
_ptr = NULL; \
} \
} while (0)
static void
ftglue_free( FT_Memory memory,
FT_Pointer block )
{
if ( block )
memory->free( memory, block );
}
FTGLUE_APIDEF( FT_Long )
ftglue_stream_pos( FT_Stream stream )
{
LOG(( "ftglue:stream:pos() -> %ld\n", stream->pos ));
return stream->pos;
}
FTGLUE_APIDEF( FT_Error )
ftglue_stream_seek( FT_Stream stream,
FT_Long pos )
{
FT_Error error = 0;
if ( stream->read )
{
if ( stream->read( stream, pos, 0, 0 ) )
error = FT_Err_Invalid_Stream_Operation;
}
else if ( pos < 0 || (FT_ULong) pos > stream->size )
error = FT_Err_Invalid_Stream_Operation;
if ( !error )
stream->pos = pos;
LOG(( "ftglue:stream:seek(%ld) -> %d\n", pos, error ));
return error;
}
FTGLUE_APIDEF( FT_Error )
ftglue_stream_frame_enter( FT_Stream stream,
FT_ULong count )
{
FT_Error error = FT_Err_Ok;
FT_ULong read_bytes;
if ( stream->read )
{
/* allocate the frame in memory */
FT_Memory memory = stream->memory;
if ( QALLOC( stream->base, count ) )
goto Exit;
/* read it */
read_bytes = stream->read( stream, stream->pos,
stream->base, count );
if ( read_bytes < count )
{
FREE( stream->base );
error = FT_Err_Invalid_Stream_Operation;
}
stream->cursor = stream->base;
stream->limit = stream->cursor + count;
stream->pos += read_bytes;
}
else
{
/* check current and new position */
if ( stream->pos >= stream->size ||
stream->pos + count > stream->size )
{
error = FT_Err_Invalid_Stream_Operation;
goto Exit;
}
/* set cursor */
stream->cursor = stream->base + stream->pos;
stream->limit = stream->cursor + count;
stream->pos += count;
}
Exit:
LOG(( "ftglue:stream:frame_enter(%ld) -> %d\n", count, error ));
return error;
}
FTGLUE_APIDEF( void )
ftglue_stream_frame_exit( FT_Stream stream )
{
if ( stream->read )
{
FT_Memory memory = stream->memory;
FREE( stream->base );
}
stream->cursor = 0;
stream->limit = 0;
LOG(( "ftglue:stream:frame_exit()\n" ));
}
FTGLUE_APIDEF( FT_Error )
ftglue_face_goto_table( FT_Face face,
FT_ULong the_tag,
FT_Stream stream )
{
FT_Error error;
LOG(( "ftglue_face_goto_table( %p, %c%c%c%c, %p )\n",
face,
(int)((the_tag >> 24) & 0xFF),
(int)((the_tag >> 16) & 0xFF),
(int)((the_tag >> 8) & 0xFF),
(int)(the_tag & 0xFF),
stream ));
if ( !FT_IS_SFNT(face) )
{
LOG(( "not a SFNT face !!\n" ));
error = FT_Err_Invalid_Face_Handle;
}
else
{
/* parse the directory table directly, without using
* FreeType's built-in data structures
*/
FT_ULong offset = 0, sig;
FT_UInt count, nn;
if ( FILE_Seek( 0 ) || ACCESS_Frame( 4 ) )
goto Exit;
sig = GET_Tag4();
FORGET_Frame();
if ( sig == FT_MAKE_TAG( 't', 't', 'c', 'f' ) )
{
/* deal with TrueType collections */
LOG(( ">> This is a TrueType Collection\n" ));
if ( FILE_Seek( 12 + face->face_index*4 ) ||
ACCESS_Frame( 4 ) )
goto Exit;
offset = GET_ULong();
FORGET_Frame();
}
LOG(( "TrueType offset = %ld\n", offset ));
if ( FILE_Seek( offset+4 ) ||
ACCESS_Frame( 2 ) )
goto Exit;
count = GET_UShort();
FORGET_Frame();
if ( FILE_Seek( offset+12 ) ||
ACCESS_Frame( count*16 ) )
goto Exit;
for ( nn = 0; nn < count; nn++ )
{
FT_ULong tag = GET_ULong();
FT_ULong checksum = GET_ULong();
FT_ULong start = GET_ULong();
FT_ULong size = GET_ULong();
FT_UNUSED(checksum);
FT_UNUSED(size);
if ( tag == the_tag )
{
LOG(( "TrueType table (start: %ld) (size: %ld)\n", start, size ));
error = ftglue_stream_seek( stream, start );
goto FoundIt;
}
}
error = FT_Err_Table_Missing;
FoundIt:
FORGET_Frame();
}
Exit:
LOG(( "TrueType error=%d\n", error ));
return error;
}
#undef QALLOC
#include "fcaliastail.h"
#undef __ftglue__
|
