830 lines
18 KiB
C
830 lines
18 KiB
C
/***************************************************************************/
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/* */
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/* ftstream.c */
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/* */
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/* I/O stream support (body). */
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/* */
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/* Copyright 2000-2001, 2002, 2004, 2005 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_STREAM_H
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#include FT_INTERNAL_DEBUG_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_stream
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FT_BASE_DEF( void )
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FT_Stream_OpenMemory( FT_Stream stream,
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const FT_Byte* base,
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FT_ULong size )
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{
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stream->base = (FT_Byte*) base;
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stream->size = size;
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stream->pos = 0;
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stream->cursor = 0;
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stream->read = 0;
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stream->close = 0;
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}
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FT_BASE_DEF( void )
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FT_Stream_Close( FT_Stream stream )
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{
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if ( stream && stream->close )
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stream->close( stream );
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}
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FT_BASE_DEF( FT_Error )
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FT_Stream_Seek( FT_Stream stream,
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FT_ULong pos )
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{
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FT_Error error = FT_Err_Ok;
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stream->pos = pos;
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if ( stream->read )
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{
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if ( stream->read( stream, pos, 0, 0 ) )
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{
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FT_ERROR(( "FT_Stream_Seek: invalid i/o; pos = 0x%lx, size = 0x%lx\n",
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pos, stream->size ));
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error = FT_Err_Invalid_Stream_Operation;
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}
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}
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/* note that seeking to the first position after the file is valid */
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else if ( pos > stream->size )
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{
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FT_ERROR(( "FT_Stream_Seek: invalid i/o; pos = 0x%lx, size = 0x%lx\n",
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pos, stream->size ));
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error = FT_Err_Invalid_Stream_Operation;
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}
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return error;
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}
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FT_BASE_DEF( FT_Error )
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FT_Stream_Skip( FT_Stream stream,
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FT_Long distance )
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{
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return FT_Stream_Seek( stream, (FT_ULong)( stream->pos + distance ) );
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}
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FT_BASE_DEF( FT_Long )
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FT_Stream_Pos( FT_Stream stream )
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{
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return stream->pos;
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}
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FT_BASE_DEF( FT_Error )
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FT_Stream_Read( FT_Stream stream,
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FT_Byte* buffer,
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FT_ULong count )
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{
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return FT_Stream_ReadAt( stream, stream->pos, buffer, count );
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}
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FT_BASE_DEF( FT_Error )
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FT_Stream_ReadAt( FT_Stream stream,
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FT_ULong pos,
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FT_Byte* buffer,
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FT_ULong count )
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{
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FT_Error error = FT_Err_Ok;
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FT_ULong read_bytes;
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if ( pos >= stream->size )
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{
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FT_ERROR(( "FT_Stream_ReadAt: invalid i/o; pos = 0x%lx, size = 0x%lx\n",
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pos, stream->size ));
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return FT_Err_Invalid_Stream_Operation;
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}
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if ( stream->read )
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read_bytes = stream->read( stream, pos, buffer, count );
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else
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{
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read_bytes = stream->size - pos;
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if ( read_bytes > count )
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read_bytes = count;
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FT_MEM_COPY( buffer, stream->base + pos, read_bytes );
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}
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stream->pos = pos + read_bytes;
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if ( read_bytes < count )
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{
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FT_ERROR(( "FT_Stream_ReadAt:" ));
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FT_ERROR(( " invalid read; expected %lu bytes, got %lu\n",
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count, read_bytes ));
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error = FT_Err_Invalid_Stream_Operation;
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}
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return error;
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}
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FT_BASE_DEF( FT_ULong )
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FT_Stream_TryRead( FT_Stream stream,
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FT_Byte* buffer,
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FT_ULong count )
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{
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FT_ULong read_bytes = 0;
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if ( stream->pos >= stream->size )
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goto Exit;
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if ( stream->read )
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read_bytes = stream->read( stream, stream->pos, buffer, count );
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else
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{
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read_bytes = stream->size - stream->pos;
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if ( read_bytes > count )
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read_bytes = count;
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FT_MEM_COPY( buffer, stream->base + stream->pos, read_bytes );
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}
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stream->pos += read_bytes;
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Exit:
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return read_bytes;
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}
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FT_BASE_DEF( FT_Error )
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FT_Stream_ExtractFrame( FT_Stream stream,
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FT_ULong count,
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FT_Byte** pbytes )
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{
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FT_Error error;
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error = FT_Stream_EnterFrame( stream, count );
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if ( !error )
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{
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*pbytes = (FT_Byte*)stream->cursor;
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/* equivalent to FT_Stream_ExitFrame(), with no memory block release */
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stream->cursor = 0;
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stream->limit = 0;
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}
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return error;
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}
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FT_BASE_DEF( void )
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FT_Stream_ReleaseFrame( FT_Stream stream,
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FT_Byte** pbytes )
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{
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if ( stream->read )
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{
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FT_Memory memory = stream->memory;
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FT_FREE( *pbytes );
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}
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*pbytes = 0;
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}
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FT_BASE_DEF( FT_Error )
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FT_Stream_EnterFrame( FT_Stream stream,
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FT_ULong count )
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{
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FT_Error error = FT_Err_Ok;
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FT_ULong read_bytes;
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/* check for nested frame access */
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FT_ASSERT( stream && stream->cursor == 0 );
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if ( stream->read )
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{
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/* allocate the frame in memory */
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FT_Memory memory = stream->memory;
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if ( FT_QALLOC( stream->base, count ) )
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goto Exit;
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/* read it */
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read_bytes = stream->read( stream, stream->pos,
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stream->base, count );
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if ( read_bytes < count )
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{
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FT_ERROR(( "FT_Stream_EnterFrame:" ));
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FT_ERROR(( " invalid read; expected %lu bytes, got %lu\n",
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count, read_bytes ));
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FT_FREE( stream->base );
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error = FT_Err_Invalid_Stream_Operation;
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}
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stream->cursor = stream->base;
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stream->limit = stream->cursor + count;
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stream->pos += read_bytes;
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}
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else
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{
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/* check current and new position */
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if ( stream->pos >= stream->size ||
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stream->pos + count > stream->size )
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{
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FT_ERROR(( "FT_Stream_EnterFrame:" ));
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FT_ERROR(( " invalid i/o; pos = 0x%lx, count = %lu, size = 0x%lx\n",
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stream->pos, count, stream->size ));
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error = FT_Err_Invalid_Stream_Operation;
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goto Exit;
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}
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/* set cursor */
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stream->cursor = stream->base + stream->pos;
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stream->limit = stream->cursor + count;
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stream->pos += count;
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}
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Exit:
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return error;
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}
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FT_BASE_DEF( void )
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FT_Stream_ExitFrame( FT_Stream stream )
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{
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/* IMPORTANT: The assertion stream->cursor != 0 was removed, given */
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/* that it is possible to access a frame of length 0 in */
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/* some weird fonts (usually, when accessing an array of */
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/* 0 records, like in some strange kern tables). */
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/* */
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/* In this case, the loader code handles the 0-length table */
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/* gracefully; however, stream.cursor is really set to 0 by the */
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/* FT_Stream_EnterFrame() call, and this is not an error. */
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/* */
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FT_ASSERT( stream );
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if ( stream->read )
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{
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FT_Memory memory = stream->memory;
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FT_FREE( stream->base );
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}
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stream->cursor = 0;
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stream->limit = 0;
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}
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FT_BASE_DEF( FT_Char )
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FT_Stream_GetChar( FT_Stream stream )
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{
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FT_Char result;
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FT_ASSERT( stream && stream->cursor );
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result = 0;
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if ( stream->cursor < stream->limit )
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result = *stream->cursor++;
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return result;
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}
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FT_BASE_DEF( FT_Short )
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FT_Stream_GetShort( FT_Stream stream )
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{
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FT_Byte* p;
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FT_Short result;
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FT_ASSERT( stream && stream->cursor );
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result = 0;
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p = stream->cursor;
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if ( p + 1 < stream->limit )
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result = FT_NEXT_SHORT( p );
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stream->cursor = p;
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return result;
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}
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FT_BASE_DEF( FT_Short )
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FT_Stream_GetShortLE( FT_Stream stream )
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{
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FT_Byte* p;
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FT_Short result;
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FT_ASSERT( stream && stream->cursor );
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result = 0;
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p = stream->cursor;
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if ( p + 1 < stream->limit )
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result = FT_NEXT_SHORT_LE( p );
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stream->cursor = p;
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return result;
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}
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FT_BASE_DEF( FT_Long )
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FT_Stream_GetOffset( FT_Stream stream )
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{
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FT_Byte* p;
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FT_Long result;
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FT_ASSERT( stream && stream->cursor );
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result = 0;
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p = stream->cursor;
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if ( p + 2 < stream->limit )
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result = FT_NEXT_OFF3( p );
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stream->cursor = p;
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return result;
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}
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FT_BASE_DEF( FT_Long )
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FT_Stream_GetLong( FT_Stream stream )
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{
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FT_Byte* p;
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FT_Long result;
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FT_ASSERT( stream && stream->cursor );
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result = 0;
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p = stream->cursor;
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if ( p + 3 < stream->limit )
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result = FT_NEXT_LONG( p );
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stream->cursor = p;
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return result;
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}
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FT_BASE_DEF( FT_Long )
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FT_Stream_GetLongLE( FT_Stream stream )
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{
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FT_Byte* p;
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FT_Long result;
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FT_ASSERT( stream && stream->cursor );
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result = 0;
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p = stream->cursor;
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if ( p + 3 < stream->limit )
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result = FT_NEXT_LONG_LE( p );
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stream->cursor = p;
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return result;
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}
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FT_BASE_DEF( FT_Char )
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FT_Stream_ReadChar( FT_Stream stream,
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FT_Error* error )
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{
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FT_Byte result = 0;
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FT_ASSERT( stream );
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*error = FT_Err_Ok;
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if ( stream->read )
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{
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if ( stream->read( stream, stream->pos, &result, 1L ) != 1L )
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goto Fail;
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}
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else
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{
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if ( stream->pos < stream->size )
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result = stream->base[stream->pos];
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else
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goto Fail;
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}
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stream->pos++;
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return result;
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Fail:
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*error = FT_Err_Invalid_Stream_Operation;
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FT_ERROR(( "FT_Stream_ReadChar: invalid i/o; pos = 0x%lx, size = 0x%lx\n",
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stream->pos, stream->size ));
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return 0;
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}
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FT_BASE_DEF( FT_Short )
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FT_Stream_ReadShort( FT_Stream stream,
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FT_Error* error )
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{
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FT_Byte reads[2];
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FT_Byte* p = 0;
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FT_Short result = 0;
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FT_ASSERT( stream );
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*error = FT_Err_Ok;
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if ( stream->pos + 1 < stream->size )
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{
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if ( stream->read )
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{
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if ( stream->read( stream, stream->pos, reads, 2L ) != 2L )
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goto Fail;
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p = reads;
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}
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else
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{
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p = stream->base + stream->pos;
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}
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if ( p )
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result = FT_NEXT_SHORT( p );
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}
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else
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goto Fail;
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stream->pos += 2;
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return result;
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Fail:
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*error = FT_Err_Invalid_Stream_Operation;
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FT_ERROR(( "FT_Stream_ReadShort:" ));
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FT_ERROR(( " invalid i/o; pos = 0x%lx, size = 0x%lx\n",
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stream->pos, stream->size ));
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return 0;
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}
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FT_BASE_DEF( FT_Short )
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FT_Stream_ReadShortLE( FT_Stream stream,
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FT_Error* error )
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{
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FT_Byte reads[2];
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FT_Byte* p = 0;
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FT_Short result = 0;
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FT_ASSERT( stream );
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*error = FT_Err_Ok;
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if ( stream->pos + 1 < stream->size )
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{
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if ( stream->read )
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{
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if ( stream->read( stream, stream->pos, reads, 2L ) != 2L )
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goto Fail;
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p = reads;
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}
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else
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{
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p = stream->base + stream->pos;
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}
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if ( p )
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result = FT_NEXT_SHORT_LE( p );
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}
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else
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goto Fail;
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stream->pos += 2;
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return result;
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Fail:
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*error = FT_Err_Invalid_Stream_Operation;
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FT_ERROR(( "FT_Stream_ReadShortLE:" ));
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FT_ERROR(( " invalid i/o; pos = 0x%lx, size = 0x%lx\n",
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stream->pos, stream->size ));
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return 0;
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}
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FT_BASE_DEF( FT_Long )
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FT_Stream_ReadOffset( FT_Stream stream,
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FT_Error* error )
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{
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FT_Byte reads[3];
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FT_Byte* p = 0;
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FT_Long result = 0;
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FT_ASSERT( stream );
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*error = FT_Err_Ok;
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if ( stream->pos + 2 < stream->size )
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{
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if ( stream->read )
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{
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if (stream->read( stream, stream->pos, reads, 3L ) != 3L )
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goto Fail;
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p = reads;
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}
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else
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{
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p = stream->base + stream->pos;
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}
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if ( p )
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result = FT_NEXT_OFF3( p );
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}
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else
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goto Fail;
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stream->pos += 3;
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return result;
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Fail:
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*error = FT_Err_Invalid_Stream_Operation;
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FT_ERROR(( "FT_Stream_ReadOffset:" ));
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FT_ERROR(( " invalid i/o; pos = 0x%lx, size = 0x%lx\n",
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stream->pos, stream->size ));
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return 0;
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}
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FT_BASE_DEF( FT_Long )
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FT_Stream_ReadLong( FT_Stream stream,
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FT_Error* error )
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{
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FT_Byte reads[4];
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FT_Byte* p = 0;
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FT_Long result = 0;
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FT_ASSERT( stream );
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*error = FT_Err_Ok;
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if ( stream->pos + 3 < stream->size )
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{
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if ( stream->read )
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{
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if ( stream->read( stream, stream->pos, reads, 4L ) != 4L )
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goto Fail;
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p = reads;
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}
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else
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{
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p = stream->base + stream->pos;
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}
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if ( p )
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result = FT_NEXT_LONG( p );
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}
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else
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goto Fail;
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stream->pos += 4;
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return result;
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Fail:
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FT_ERROR(( "FT_Stream_ReadLong: invalid i/o; pos = 0x%lx, size = 0x%lx\n",
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stream->pos, stream->size ));
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*error = FT_Err_Invalid_Stream_Operation;
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return 0;
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}
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|
|
FT_BASE_DEF( FT_Long )
|
|
FT_Stream_ReadLongLE( FT_Stream stream,
|
|
FT_Error* error )
|
|
{
|
|
FT_Byte reads[4];
|
|
FT_Byte* p = 0;
|
|
FT_Long result = 0;
|
|
|
|
|
|
FT_ASSERT( stream );
|
|
|
|
*error = FT_Err_Ok;
|
|
|
|
if ( stream->pos + 3 < stream->size )
|
|
{
|
|
if ( stream->read )
|
|
{
|
|
if ( stream->read( stream, stream->pos, reads, 4L ) != 4L )
|
|
goto Fail;
|
|
|
|
p = reads;
|
|
}
|
|
else
|
|
{
|
|
p = stream->base + stream->pos;
|
|
}
|
|
|
|
if ( p )
|
|
result = FT_NEXT_LONG_LE( p );
|
|
}
|
|
else
|
|
goto Fail;
|
|
|
|
stream->pos += 4;
|
|
|
|
return result;
|
|
|
|
Fail:
|
|
FT_ERROR(( "FT_Stream_ReadLongLE:" ));
|
|
FT_ERROR(( " invalid i/o; pos = 0x%lx, size = 0x%lx\n",
|
|
stream->pos, stream->size ));
|
|
*error = FT_Err_Invalid_Stream_Operation;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
FT_BASE_DEF( FT_Error )
|
|
FT_Stream_ReadFields( FT_Stream stream,
|
|
const FT_Frame_Field* fields,
|
|
void* structure )
|
|
{
|
|
FT_Error error;
|
|
FT_Bool frame_accessed = 0;
|
|
FT_Byte* cursor = stream->cursor;
|
|
|
|
|
|
if ( !fields || !stream )
|
|
return FT_Err_Invalid_Argument;
|
|
|
|
error = FT_Err_Ok;
|
|
do
|
|
{
|
|
FT_ULong value;
|
|
FT_Int sign_shift;
|
|
FT_Byte* p;
|
|
|
|
|
|
switch ( fields->value )
|
|
{
|
|
case ft_frame_start: /* access a new frame */
|
|
error = FT_Stream_EnterFrame( stream, fields->offset );
|
|
if ( error )
|
|
goto Exit;
|
|
|
|
frame_accessed = 1;
|
|
cursor = stream->cursor;
|
|
fields++;
|
|
continue; /* loop! */
|
|
|
|
case ft_frame_bytes: /* read a byte sequence */
|
|
case ft_frame_skip: /* skip some bytes */
|
|
{
|
|
FT_UInt len = fields->size;
|
|
|
|
|
|
if ( cursor + len > stream->limit )
|
|
{
|
|
error = FT_Err_Invalid_Stream_Operation;
|
|
goto Exit;
|
|
}
|
|
|
|
if ( fields->value == ft_frame_bytes )
|
|
{
|
|
p = (FT_Byte*)structure + fields->offset;
|
|
FT_MEM_COPY( p, cursor, len );
|
|
}
|
|
cursor += len;
|
|
fields++;
|
|
continue;
|
|
}
|
|
|
|
case ft_frame_byte:
|
|
case ft_frame_schar: /* read a single byte */
|
|
value = FT_NEXT_BYTE(cursor);
|
|
sign_shift = 24;
|
|
break;
|
|
|
|
case ft_frame_short_be:
|
|
case ft_frame_ushort_be: /* read a 2-byte big-endian short */
|
|
value = FT_NEXT_USHORT(cursor);
|
|
sign_shift = 16;
|
|
break;
|
|
|
|
case ft_frame_short_le:
|
|
case ft_frame_ushort_le: /* read a 2-byte little-endian short */
|
|
value = FT_NEXT_USHORT_LE(cursor);
|
|
sign_shift = 16;
|
|
break;
|
|
|
|
case ft_frame_long_be:
|
|
case ft_frame_ulong_be: /* read a 4-byte big-endian long */
|
|
value = FT_NEXT_ULONG(cursor);
|
|
sign_shift = 0;
|
|
break;
|
|
|
|
case ft_frame_long_le:
|
|
case ft_frame_ulong_le: /* read a 4-byte little-endian long */
|
|
value = FT_NEXT_ULONG_LE(cursor);
|
|
sign_shift = 0;
|
|
break;
|
|
|
|
case ft_frame_off3_be:
|
|
case ft_frame_uoff3_be: /* read a 3-byte big-endian long */
|
|
value = FT_NEXT_UOFF3(cursor);
|
|
sign_shift = 8;
|
|
break;
|
|
|
|
case ft_frame_off3_le:
|
|
case ft_frame_uoff3_le: /* read a 3-byte little-endian long */
|
|
value = FT_NEXT_UOFF3_LE(cursor);
|
|
sign_shift = 8;
|
|
break;
|
|
|
|
default:
|
|
/* otherwise, exit the loop */
|
|
stream->cursor = cursor;
|
|
goto Exit;
|
|
}
|
|
|
|
/* now, compute the signed value is necessary */
|
|
if ( fields->value & FT_FRAME_OP_SIGNED )
|
|
value = (FT_ULong)( (FT_Int32)( value << sign_shift ) >> sign_shift );
|
|
|
|
/* finally, store the value in the object */
|
|
|
|
p = (FT_Byte*)structure + fields->offset;
|
|
switch ( fields->size )
|
|
{
|
|
case (8 / FT_CHAR_BIT):
|
|
*(FT_Byte*)p = (FT_Byte)value;
|
|
break;
|
|
|
|
case (16 / FT_CHAR_BIT):
|
|
*(FT_UShort*)p = (FT_UShort)value;
|
|
break;
|
|
|
|
case (32 / FT_CHAR_BIT):
|
|
*(FT_UInt32*)p = (FT_UInt32)value;
|
|
break;
|
|
|
|
default: /* for 64-bit systems */
|
|
*(FT_ULong*)p = (FT_ULong)value;
|
|
}
|
|
|
|
/* go to next field */
|
|
fields++;
|
|
}
|
|
while ( 1 );
|
|
|
|
Exit:
|
|
/* close the frame if it was opened by this read */
|
|
if ( frame_accessed )
|
|
FT_Stream_ExitFrame( stream );
|
|
|
|
return error;
|
|
}
|
|
|
|
|
|
/* END */
|