477 lines
14 KiB
C
477 lines
14 KiB
C
/***************************************************************************/
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/* */
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/* t2load.c */
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/* */
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/* TrueType glyph data/program tables loader (body). */
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/* */
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/* Copyright 1996-1999 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 <freetype/internal/ftdebug.h>
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#include <freetype/internal/ftobjs.h>
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#include <freetype/internal/ftstream.h>
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#include <freetype/internal/psnames.h>
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#include <freetype/fterrors.h>
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#include <freetype/tttags.h>
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#include <t2load.h>
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#include <t2parse.h>
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_ttload
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/* read a CFF offset from memory */
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static
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FT_ULong t2_get_offset( FT_Byte* p,
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FT_Byte off_size )
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{
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FT_ULong result;
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for ( result = 0; off_size > 0; off_size-- )
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result = (result <<= 8) | *p++;
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return result;
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}
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static
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FT_Error t2_new_cff_index( CFF_Index* index,
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FT_Stream stream,
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FT_Bool load )
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{
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FT_Error error;
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FT_Memory memory = stream->memory;
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FT_UShort count;
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MEM_Set( index, 0, sizeof(*index) );
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index->stream = stream;
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if ( !READ_UShort( count ) &&
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count > 0 )
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{
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FT_Byte* p;
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FT_Byte offsize;
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FT_ULong data_size;
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FT_ULong* poff;
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/* there is at least one element, read the offset size */
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/* then access the offset table to compute the index's total size */
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if ( READ_Byte( offsize ) )
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goto Exit;
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index->stream = stream;
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index->count = count;
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index->off_size = offsize;
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data_size = (FT_ULong)(count+1) * offsize;
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if ( ALLOC_ARRAY( index->offsets, count+1, FT_ULong ) ||
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ACCESS_Frame( data_size ))
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goto Exit;
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poff = index->offsets;
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p = (FT_Byte*)stream->cursor;
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for ( ; (FT_Short)count >= 0; count-- )
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{
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poff[0] = t2_get_offset( p, offsize );
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poff++;
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p += offsize;
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}
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FORGET_Frame();
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index->data_offset = FILE_Pos();
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data_size = poff[-1]-1;
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if (load)
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{
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/* load the data */
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if ( EXTRACT_Frame( data_size, index->bytes ) )
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goto Exit;
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}
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else
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{
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/* skip the data */
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(void)FILE_Skip( data_size );
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}
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}
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Exit:
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if (error)
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FREE( index->offsets );
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return error;
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}
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static
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void t2_done_cff_index( CFF_Index* index )
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{
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if ( index->stream )
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{
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FT_Stream stream = index->stream;
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FT_Memory memory = stream->memory;
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if (index->bytes)
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RELEASE_Frame( index->bytes );
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FREE( index->offsets );
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MEM_Set( index, 0, sizeof(*index) );
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}
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}
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static
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FT_Error t2_explicit_cff_index( CFF_Index* index,
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FT_Byte** *table )
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{
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FT_Error error = 0;
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FT_Memory memory = index->stream->memory;
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FT_UInt n, offset, old_offset;
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FT_Byte** t;
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*table = 0;
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if ( index->count > 0 && !ALLOC_ARRAY( t, index->count+1, FT_Byte* ) )
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{
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old_offset = 1;
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for ( n = 0; n <= index->count; n++ )
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{
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offset = index->offsets[n];
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if (!offset)
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offset = old_offset;
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t[n] = index->bytes + offset - 1;
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old_offset = offset;
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}
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*table = t;
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}
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return error;
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}
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LOCAL_FUNC
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FT_Error T2_Access_Element( CFF_Index* index,
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FT_UInt element,
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FT_Byte* *pbytes,
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FT_ULong *pbyte_len )
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{
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FT_Error error = 0;
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if ( index && index->count > element )
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{
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/* compute start and end offsets */
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FT_ULong off1, off2;
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off1 = index->offsets[element];
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if (off1)
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{
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do
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{
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element++;
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off2 = index->offsets[element];
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}
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while (off2 == 0 && element < index->count);
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if (!off2)
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off1 = 0;
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}
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/* access element */
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if (off1)
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{
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*pbyte_len = off2 - off1;
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if (index->bytes)
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{
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/* this index was completely loaded in memory, that's easy */
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*pbytes = index->bytes + off1 - 1;
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}
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else
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{
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/* this index is still on disk/file, access it through a frame */
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FT_Stream stream = index->stream;
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if ( FILE_Seek( index->data_offset + off1 - 1 ) ||
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EXTRACT_Frame( off2-off1, *pbytes ) )
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goto Exit;
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}
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}
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else
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{
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/* empty index element */
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*pbytes = 0;
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*pbyte_len = 0;
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}
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}
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else
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error = FT_Err_Invalid_Argument;
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Exit:
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return error;
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}
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LOCAL_FUNC
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void T2_Forget_Element( CFF_Index* index,
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FT_Byte* *pbytes )
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{
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if (index->bytes == 0)
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{
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FT_Stream stream = index->stream;
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RELEASE_Frame( *pbytes );
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}
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}
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LOCAL_FUNC
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FT_String* T2_Get_Name( CFF_Index* index,
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FT_UInt element )
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{
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FT_Memory memory = index->stream->memory;
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FT_Byte* bytes;
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FT_ULong byte_len;
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FT_Error error;
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FT_String* name = 0;
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error = T2_Access_Element( index, element, &bytes, &byte_len );
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if (error) goto Exit;
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if ( !ALLOC( name, byte_len+1 ) )
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{
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MEM_Copy( name, bytes, byte_len );
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name[byte_len] = 0;
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}
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T2_Forget_Element( index, &bytes );
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Exit:
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return name;
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}
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#if 0 /* unused until we fully support pure-CFF fonts */
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LOCAL_FUNC
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FT_String* T2_Get_String( CFF_Index* index,
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FT_UInt sid,
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PSNames_Interface* interface )
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{
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/* if it's not a standard string, return it */
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if ( sid > 390 )
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return T2_Get_Name( index, sid - 390 );
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/* that's a standard string, fetch a copy from the psnamed module */
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{
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FT_String* name = 0;
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const char* adobe_name = interface->adobe_std_strings( sid );
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FT_UInt len;
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if (adobe_name)
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{
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FT_Memory memory = index->stream->memory;
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FT_Error error;
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len = (FT_UInt)strlen(adobe_name);
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if ( !ALLOC( name, len+1 ) )
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{
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MEM_Copy( name, adobe_name, len );
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name[len] = 0;
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}
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}
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return name;
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}
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}
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#endif
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LOCAL_FUNC
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FT_Error T2_Load_CFF_Font( FT_Stream stream,
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FT_Int face_index,
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CFF_Font* font )
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{
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static const FT_Frame_Field cff_header_fields[] = {
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FT_FRAME_START(4),
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FT_FRAME_BYTE( CFF_Font, version_major ),
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FT_FRAME_BYTE( CFF_Font, version_minor ),
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FT_FRAME_BYTE( CFF_Font, header_size ),
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FT_FRAME_BYTE( CFF_Font, absolute_offsize ),
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FT_FRAME_END };
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FT_Error error;
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FT_Memory memory = stream->memory;
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FT_ULong base_offset;
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MEM_Set( font, 0, sizeof(*font) );
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font->stream = stream;
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font->memory = memory;
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base_offset = FILE_Pos();
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/* read CFF font header */
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if ( READ_Fields( cff_header_fields, font ) )
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goto Exit;
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/* check format */
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if ( font->version_major != 1 ||
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font->header_size < 4 ||
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font->absolute_offsize > 4 )
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{
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FT_ERROR(( "incorrect CFF font header !!\n" ));
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error = FT_Err_Unknown_File_Format;
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goto Exit;
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}
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/* skip the rest of the header */
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(void)FILE_Skip( font->header_size - 4 );
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/* read the name, top dict, string and global subrs index */
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error = t2_new_cff_index( &font->name_index, stream, 0 ) ||
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t2_new_cff_index( &font->top_dict_index, stream, 0 ) ||
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t2_new_cff_index( &font->string_index, stream, 0 ) ||
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t2_new_cff_index( &font->global_subrs_index, stream, 1 );
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if (error) goto Exit;
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/* well, we don't really forget the "disabled" fonts.. */
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font->num_faces = font->name_index.count;
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if (face_index >= font->num_faces)
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{
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FT_ERROR(( "T2.Load_Font: incorrect face index = %d\n", face_index ));
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error = FT_Err_Invalid_Argument;
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}
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/* in case of a font format check, simply exit now */
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if (face_index >= 0)
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{
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T2_Parser parser;
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FT_Byte* dict;
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FT_ULong dict_len;
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CFF_Index* index = &font->top_dict_index;
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CFF_Top_Dict* top = &font->top_dict;
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/* parse the top-level font dictionary */
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T2_Parser_Init( &parser, T2CODE_TOPDICT, &font->top_dict );
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/* set defaults */
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memset( top, 0, sizeof(*top) );
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top->underline_position = -100;
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top->underline_thickness = 50;
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top->charstring_type = 2;
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top->font_matrix.xx = 0x10000;
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top->font_matrix.yy = 0x10000;
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top->cid_count = 8720;
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error = T2_Access_Element( index, face_index, &dict, &dict_len ) ||
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T2_Parser_Run( &parser, dict, dict + dict_len );
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T2_Forget_Element( &font->top_dict_index, &dict );
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if (error) goto Exit;
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/* parse the private dictionary, if any */
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if (font->top_dict.private_offset && font->top_dict.private_size)
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{
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CFF_Private* priv = &font->private_dict;
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/* set defaults */
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priv->blue_shift = 7;
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priv->blue_fuzz = 1;
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priv->lenIV = -1;
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priv->expansion_factor = (FT_Fixed)0.06*0x10000;
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priv->blue_scale = (FT_Fixed)0.039625*0x10000;
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T2_Parser_Init( &parser, T2CODE_PRIVATE, priv );
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if ( FILE_Seek( base_offset + font->top_dict.private_offset ) ||
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ACCESS_Frame( font->top_dict.private_size ) )
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goto Exit;
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error = T2_Parser_Run( &parser,
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(FT_Byte*)stream->cursor,
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(FT_Byte*)stream->limit );
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FORGET_Frame();
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if (error) goto Exit;
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}
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/* read the charstrings index now */
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if ( font->top_dict.charstrings_offset == 0 )
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{
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FT_ERROR(( "T2.New_CFF_Font: no charstrings offset !!\n" ));
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error = FT_Err_Unknown_File_Format;
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goto Exit;
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}
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if ( FILE_Seek( base_offset + font->top_dict.charstrings_offset ) )
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goto Exit;
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error = t2_new_cff_index( &font->charstrings_index, stream, 0 );
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if (error) goto Exit;
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/* read the local subrs, if any */
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if (font->private_dict.local_subrs_offset) {
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if ( FILE_Seek( base_offset + font->top_dict.private_offset +
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font->private_dict.local_subrs_offset ) )
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goto Exit;
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error = t2_new_cff_index( &font->local_subrs_index, stream, 1 );
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if (error) goto Exit;
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}
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/* explicit the global and local subrs */
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if (font->private_dict.local_subrs_offset) {
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font->num_local_subrs = font->local_subrs_index.count;
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} else {
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font->num_local_subrs = 0;
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}
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font->num_global_subrs = font->global_subrs_index.count;
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error = t2_explicit_cff_index( &font->global_subrs_index, &font->global_subrs ) ;
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if (font->private_dict.local_subrs_offset) {
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error |= t2_explicit_cff_index( &font->local_subrs_index, &font->local_subrs ) ;
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}
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if (error) goto Exit;
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}
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/* get the font name */
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font->font_name = T2_Get_Name( &font->name_index, face_index );
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Exit:
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return error;
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}
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LOCAL_FUNC
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void T2_Done_CFF_Font( CFF_Font* font )
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{
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FT_Memory memory = font->memory;
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t2_done_cff_index( &font->global_subrs_index );
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t2_done_cff_index( &font->string_index );
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t2_done_cff_index( &font->top_dict_index );
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t2_done_cff_index( &font->name_index );
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t2_done_cff_index( &font->charstrings_index );
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FREE( font->local_subrs );
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FREE( font->global_subrs );
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FREE( font->font_name );
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}
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/***** *****/
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/***** TYPE 2 TABLES DECODING.. *****/
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/***** *****/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/* END */
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