?? ftstream.c
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/***************************************************************************/
/* */
/* ftstream.c */
/* */
/* I/O stream support (body). */
/* */
/* Copyright 2000-2001, 2002, 2004, 2005, 2006 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
#include <ft2build.h>
#include FT_INTERNAL_STREAM_H
#include FT_INTERNAL_DEBUG_H
/*************************************************************************/
/* */
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
/* messages during execution. */
/* */
#undef FT_COMPONENT
#define FT_COMPONENT trace_stream
FT_BASE_DEF( void )
FT_Stream_OpenMemory( FT_Stream stream,
const FT_Byte* base,
FT_ULong size )
{
stream->base = (FT_Byte*) base;
stream->size = size;
stream->pos = 0;
stream->cursor = 0;
stream->read = 0;
stream->close = 0;
}
FT_BASE_DEF( void )
FT_Stream_Close( FT_Stream stream )
{
if ( stream && stream->close )
stream->close( stream );
}
FT_BASE_DEF( FT_Error )
FT_Stream_Seek( FT_Stream stream,
FT_ULong pos )
{
FT_Error error = FT_Err_Ok;
stream->pos = pos;
if ( stream->read )
{
if ( stream->read( stream, pos, 0, 0 ) )
{
FT_ERROR(( "FT_Stream_Seek: invalid i/o; pos = 0x%lx, size = 0x%lx\n",
pos, stream->size ));
error = FT_Err_Invalid_Stream_Operation;
}
}
/* note that seeking to the first position after the file is valid */
else if ( pos > stream->size )
{
FT_ERROR(( "FT_Stream_Seek: invalid i/o; pos = 0x%lx, size = 0x%lx\n",
pos, stream->size ));
error = FT_Err_Invalid_Stream_Operation;
}
return error;
}
FT_BASE_DEF( FT_Error )
FT_Stream_Skip( FT_Stream stream,
FT_Long distance )
{
return FT_Stream_Seek( stream, (FT_ULong)( stream->pos + distance ) );
}
FT_BASE_DEF( FT_Long )
FT_Stream_Pos( FT_Stream stream )
{
return stream->pos;
}
FT_BASE_DEF( FT_Error )
FT_Stream_Read( FT_Stream stream,
FT_Byte* buffer,
FT_ULong count )
{
return FT_Stream_ReadAt( stream, stream->pos, buffer, count );
}
FT_BASE_DEF( FT_Error )
FT_Stream_ReadAt( FT_Stream stream,
FT_ULong pos,
FT_Byte* buffer,
FT_ULong count )
{
FT_Error error = FT_Err_Ok;
FT_ULong read_bytes;
if ( pos >= stream->size )
{
FT_ERROR(( "FT_Stream_ReadAt: invalid i/o; pos = 0x%lx, size = 0x%lx\n",
pos, stream->size ));
return FT_Err_Invalid_Stream_Operation;
}
if ( stream->read )
read_bytes = stream->read( stream, pos, buffer, count );
else
{
read_bytes = stream->size - pos;
if ( read_bytes > count )
read_bytes = count;
FT_MEM_COPY( buffer, stream->base + pos, read_bytes );
}
stream->pos = pos + read_bytes;
if ( read_bytes < count )
{
FT_ERROR(( "FT_Stream_ReadAt:" ));
FT_ERROR(( " invalid read; expected %lu bytes, got %lu\n",
count, read_bytes ));
error = FT_Err_Invalid_Stream_Operation;
}
return error;
}
FT_BASE_DEF( FT_ULong )
FT_Stream_TryRead( FT_Stream stream,
FT_Byte* buffer,
FT_ULong count )
{
FT_ULong read_bytes = 0;
if ( stream->pos >= stream->size )
goto Exit;
if ( stream->read )
read_bytes = stream->read( stream, stream->pos, buffer, count );
else
{
read_bytes = stream->size - stream->pos;
if ( read_bytes > count )
read_bytes = count;
FT_MEM_COPY( buffer, stream->base + stream->pos, read_bytes );
}
stream->pos += read_bytes;
Exit:
return read_bytes;
}
FT_BASE_DEF( FT_Error )
FT_Stream_ExtractFrame( FT_Stream stream,
FT_ULong count,
FT_Byte** pbytes )
{
FT_Error error;
error = FT_Stream_EnterFrame( stream, count );
if ( !error )
{
*pbytes = (FT_Byte*)stream->cursor;
/* equivalent to FT_Stream_ExitFrame(), with no memory block release */
stream->cursor = 0;
stream->limit = 0;
}
return error;
}
FT_BASE_DEF( void )
FT_Stream_ReleaseFrame( FT_Stream stream,
FT_Byte** pbytes )
{
if ( stream->read )
{
FT_Memory memory = stream->memory;
#ifdef FT_DEBUG_MEMORY
ft_mem_free( memory, *pbytes );
*pbytes = NULL;
#else
FT_FREE( *pbytes );
#endif
}
*pbytes = 0;
}
FT_BASE_DEF( FT_Error )
FT_Stream_EnterFrame( FT_Stream stream,
FT_ULong count )
{
FT_Error error = FT_Err_Ok;
FT_ULong read_bytes;
/* check for nested frame access */
FT_ASSERT( stream && stream->cursor == 0 );
if ( stream->read )
{
/* allocate the frame in memory */
FT_Memory memory = stream->memory;
#ifdef FT_DEBUG_MEMORY
/* assume _ft_debug_file and _ft_debug_lineno are already set */
stream->base = (unsigned char*)ft_mem_qalloc( memory, count, &error );
if ( error )
goto Exit;
#else
if ( FT_QALLOC( stream->base, count ) )
goto Exit;
#endif
/* read it */
read_bytes = stream->read( stream, stream->pos,
stream->base, count );
if ( read_bytes < count )
{
FT_ERROR(( "FT_Stream_EnterFrame:" ));
FT_ERROR(( " invalid read; expected %lu bytes, got %lu\n",
count, read_bytes ));
FT_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 )
{
FT_ERROR(( "FT_Stream_EnterFrame:" ));
FT_ERROR(( " invalid i/o; pos = 0x%lx, count = %lu, size = 0x%lx\n",
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:
return error;
}
FT_BASE_DEF( void )
FT_Stream_ExitFrame( FT_Stream stream )
{
/* IMPORTANT: The assertion stream->cursor != 0 was removed, given */
/* that it is possible to access a frame of length 0 in */
/* some weird fonts (usually, when accessing an array of */
/* 0 records, like in some strange kern tables). */
/* */
/* In this case, the loader code handles the 0-length table */
/* gracefully; however, stream.cursor is really set to 0 by the */
/* FT_Stream_EnterFrame() call, and this is not an error. */
/* */
FT_ASSERT( stream );
if ( stream->read )
{
FT_Memory memory = stream->memory;
#ifdef FT_DEBUG_MEMORY
ft_mem_free( memory, stream->base );
stream->base = NULL;
#else
FT_FREE( stream->base );
#endif
}
stream->cursor = 0;
stream->limit = 0;
}
FT_BASE_DEF( FT_Char )
FT_Stream_GetChar( FT_Stream stream )
{
FT_Char result;
FT_ASSERT( stream && stream->cursor );
result = 0;
if ( stream->cursor < stream->limit )
result = *stream->cursor++;
return result;
}
FT_BASE_DEF( FT_Short )
FT_Stream_GetShort( FT_Stream stream )
{
FT_Byte* p;
FT_Short result;
FT_ASSERT( stream && stream->cursor );
result = 0;
p = stream->cursor;
if ( p + 1 < stream->limit )
result = FT_NEXT_SHORT( p );
stream->cursor = p;
return result;
}
FT_BASE_DEF( FT_Short )
FT_Stream_GetShortLE( FT_Stream stream )
{
FT_Byte* p;
FT_Short result;
FT_ASSERT( stream && stream->cursor );
result = 0;
p = stream->cursor;
if ( p + 1 < stream->limit )
result = FT_NEXT_SHORT_LE( p );
stream->cursor = p;
return result;
}
FT_BASE_DEF( FT_Long )
FT_Stream_GetOffset( FT_Stream stream )
{
FT_Byte* p;
FT_Long result;
FT_ASSERT( stream && stream->cursor );
result = 0;
p = stream->cursor;
if ( p + 2 < stream->limit )
result = FT_NEXT_OFF3( p );
stream->cursor = p;
return result;
}
FT_BASE_DEF( FT_Long )
FT_Stream_GetLong( FT_Stream stream )
{
FT_Byte* p;
FT_Long result;
FT_ASSERT( stream && stream->cursor );
result = 0;
p = stream->cursor;
if ( p + 3 < stream->limit )
result = FT_NEXT_LONG( p );
stream->cursor = p;
return result;
}
FT_BASE_DEF( FT_Long )
FT_Stream_GetLongLE( FT_Stream stream )
{
FT_Byte* p;
FT_Long result;
FT_ASSERT( stream && stream->cursor );
result = 0;
p = stream->cursor;
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