ref: 16bf6da6d90113be9c58331346311cdf6e3d34e5
dir: /src/base/ftstream.c/
/***************************************************************************/
/* */
/* ftstream.c */
/* */
/* I/O stream support (body). */
/* */
/* Copyright 2000 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 <freetype/internal/ftstream.h>
#include <freetype/internal/ftdebug.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_New_Memory_Stream( FT_Library library,
FT_Byte* base,
FT_ULong size,
FT_Stream stream )
{
stream->memory = library->memory;
stream->base = base;
stream->size = size;
stream->pos = 0;
stream->cursor = 0;
stream->read = 0;
stream->close = 0;
}
FT_BASE_DEF( FT_Error ) FT_Seek_Stream( FT_Stream stream,
FT_ULong pos )
{
FT_Error error;
stream->pos = pos;
if ( stream->read )
{
if ( stream->read( stream, pos, 0, 0 ) )
{
FT_ERROR(( "FT_Seek_Stream:" ));
FT_ERROR(( " invalid i/o; pos = 0x%lx, size = 0x%lx\n",
pos, stream->size ));
error = FT_Err_Invalid_Stream_Operation;
}
else
error = FT_Err_Ok;
}
/* note that seeking to the first position after the file is valid */
else if ( pos > stream->size )
{
FT_ERROR(( "FT_Seek_Stream:" ));
FT_ERROR(( " invalid i/o; pos = 0x%lx, size = 0x%lx\n",
pos, stream->size ));
error = FT_Err_Invalid_Stream_Operation;
}
else
error = FT_Err_Ok;
return error;
}
FT_BASE_DEF( FT_Error ) FT_Skip_Stream( FT_Stream stream,
FT_Long distance )
{
return FT_Seek_Stream( 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_Read_Stream( FT_Stream stream,
FT_Byte* buffer,
FT_ULong count )
{
return FT_Read_Stream_At( stream, stream->pos, buffer, count );
}
FT_BASE_DEF( FT_Error ) FT_Read_Stream_At( 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_Read_Stream_At:" ));
FT_ERROR(( " 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;
MEM_Copy( buffer, stream->base + pos, read_bytes );
}
stream->pos = pos + read_bytes;
if ( read_bytes < count )
{
FT_ERROR(( "FT_Read_Stream_At:" ));
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_Error ) FT_Extract_Frame( FT_Stream stream,
FT_ULong count,
FT_Byte** pbytes )
{
FT_Error error;
error = FT_Access_Frame( stream, count );
if ( !error )
{
*pbytes = (FT_Byte*)stream->cursor;
/* equivalent to FT_Forget_Frame(), with no memory block release */
stream->cursor = 0;
stream->limit = 0;
}
return error;
}
FT_BASE_DEF( void ) FT_Release_Frame( FT_Stream stream,
FT_Byte** pbytes )
{
if ( stream->read )
{
FT_Memory memory = stream->memory;
FREE( *pbytes );
}
*pbytes = 0;
}
FT_BASE_DEF( FT_Error ) FT_Access_Frame( 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;
if ( ALLOC( stream->base, count ) )
goto Exit;
/* read it */
read_bytes = stream->read( stream, stream->pos,
stream->base, count );
if ( read_bytes < count )
{
FT_ERROR(( "FT_Access_Frame:" ));
FT_ERROR(( " invalid read; expected %lu bytes, got %lu\n",
count, read_bytes ));
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_Access_Frame:" ));
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_Forget_Frame( 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_Access_Frame() call, and this is not an error. */
/* */
FT_Assert( stream );
if ( stream->read )
{
FT_Memory memory = stream->memory;
FREE( stream->base );
}
stream->cursor = 0;
stream->limit = 0;
}
FT_BASE_DEF( FT_Char ) FT_Get_Char( 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_Get_Short( 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 = NEXT_Short( p );
stream->cursor = p;
return result;
}
FT_BASE_DEF( FT_Short ) FT_Get_ShortLE( 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 = NEXT_ShortLE( p );
stream->cursor = p;
return result;
}
FT_BASE_DEF( FT_Long ) FT_Get_Offset( 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 = NEXT_Offset( p );
stream->cursor = p;
return result;
}
FT_BASE_DEF( FT_Long ) FT_Get_Long( 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 = NEXT_Long( p );
stream->cursor = p;
return result;
}
FT_BASE_DEF( FT_Long ) FT_Get_LongLE( 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 = NEXT_LongLE( p );
stream->cursor = p;
return result;
}
FT_BASE_DEF( FT_Char ) FT_Read_Char( FT_Stream stream,
FT_Error* error )
{
FT_Byte result = 0;
FT_Assert( stream );
*error = FT_Err_Ok;
if ( stream->read )
{
if ( stream->read( stream, stream->pos, &result, 1L ) != 1L )
goto Fail;
}
else
{
if ( stream->pos < stream->size )
result = stream->base[stream->pos];
else
goto Fail;
}
stream->pos++;
return result;
Fail:
*error = FT_Err_Invalid_Stream_Operation;
FT_ERROR(( "FT_Read_Char:" ));
FT_ERROR(( " invalid i/o; pos = 0x%lx, size = 0x%lx\n",
stream->pos, stream->size ));
return 0;
}
FT_BASE_DEF( FT_Short ) FT_Read_Short( FT_Stream stream,
FT_Error* error )
{
FT_Byte reads[2];
FT_Byte* p = 0;
FT_Short result = 0;
FT_Assert( stream );
*error = FT_Err_Ok;
if ( stream->pos + 1 < stream->size )
{
if ( stream->read )
{
if ( stream->read( stream, stream->pos, reads, 2L ) != 2L )
goto Fail;
p = reads;
}
else
{
p = stream->base + stream->pos;
}
if ( p )
result = NEXT_Short( p );
}
else
goto Fail;
stream->pos += 2;
return result;
Fail:
*error = FT_Err_Invalid_Stream_Operation;
FT_ERROR(( "FT_Read_Short:" ));
FT_ERROR(( " invalid i/o; pos = 0x%lx, size = 0x%lx\n",
stream->pos, stream->size ));
return 0;
}
FT_BASE_DEF( FT_Short ) FT_Read_ShortLE( FT_Stream stream,
FT_Error* error )
{
FT_Byte reads[2];
FT_Byte* p = 0;
FT_Short result = 0;
FT_Assert( stream );
*error = FT_Err_Ok;
if ( stream->pos + 1 < stream->size )
{
if ( stream->read )
{
if ( stream->read( stream, stream->pos, reads, 2L ) != 2L )
goto Fail;
p = reads;
}
else
{
p = stream->base + stream->pos;
}
if ( p )
result = NEXT_ShortLE( p );
}
else
goto Fail;
stream->pos += 2;
return result;
Fail:
*error = FT_Err_Invalid_Stream_Operation;
FT_ERROR(( "FT_Read_Short:" ));
FT_ERROR(( " invalid i/o; pos = 0x%lx, size = 0x%lx\n",
stream->pos, stream->size ));
return 0;
}
FT_BASE_DEF( FT_Long ) FT_Read_Offset( FT_Stream stream,
FT_Error* error )
{
FT_Byte reads[3];
FT_Byte* p = 0;
FT_Long result = 0;
FT_Assert( stream );
*error = FT_Err_Ok;
if ( stream->pos + 2 < stream->size )
{
if ( stream->read )
{
if (stream->read( stream, stream->pos, reads, 3L ) != 3L )
goto Fail;
p = reads;
}
else
{
p = stream->base + stream->pos;
}
if ( p )
result = NEXT_Offset( p );
}
else
goto Fail;
stream->pos += 3;
return result;
Fail:
*error = FT_Err_Invalid_Stream_Operation;
FT_ERROR(( "FT_Read_Offset:" ));
FT_ERROR(( " invalid i/o; pos = 0x%lx, size = 0x%lx\n",
stream->pos, stream->size ));
return 0;
}
FT_BASE_DEF( FT_Long ) FT_Read_Long( 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 = NEXT_Long( p );
}
else
goto Fail;
stream->pos += 4;
return result;
Fail:
FT_ERROR(( "FT_Read_Long:" ));
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_Long ) FT_Read_LongLE( 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 = NEXT_LongLE( p );
}
else
goto Fail;
stream->pos += 4;
return result;
Fail:
FT_ERROR(( "FT_Read_Long:" ));
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_Read_Fields( 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_Access_Frame( 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;
MEM_Copy( p, cursor, len );
}
cursor += len;
fields++;
continue;
}
case ft_frame_byte:
case ft_frame_schar: /* read a single byte */
value = 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 = 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 = NEXT_UShortLE(cursor);
sign_shift = 16;
break;
case ft_frame_long_be:
case ft_frame_ulong_be: /* read a 4-byte big-endian long */
value = 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 = NEXT_ULongLE(cursor);
sign_shift = 0;
break;
case ft_frame_off3_be:
case ft_frame_uoff3_be: /* read a 3-byte big-endian long */
value = NEXT_UOffset(cursor);
sign_shift = 8;
break;
case ft_frame_off3_le:
case ft_frame_uoff3_le: /* read a 3-byte little-endian long */
value = NEXT_UOffsetLE(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 1:
*(FT_Byte*)p = (FT_Byte)value;
break;
case 2:
*(FT_UShort*)p = (FT_UShort)value;
break;
case 4:
*(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_Forget_Frame( stream );
return error;
}
/* END */