Move WOFF sources and headers to separate files. * include/freetype/internal/wofftypes.h, src/sfnt/sfwoff.c, src/sfnt/sfwoff.h: New files. * include/freetype/internal/fttrace.h: Register `sfwoff.c'. * include/freetype/internal/internal.h: Define FT_INTERNAL_WOFF_TYPES_H. * include/freetype/internal/sfnt.h: Include FT_INTERNAL_WOFF_TYPES_H. * include/freetype/internal/tttypes.h: Move out WOFF structures. * src/sfnt/rules.mk: Add `sfwoff.c'. * src/sfnt/sfnt.c: Include `sfwoff.c'. * src/sfnt/sfobjs.c: Include `sfwoff.h', move out WOFF sources.cmakelists-updates
Nikhil Ramakrishnan
6 years ago
parent
f0de218ced
commit
7b275a5af1
11 changed files with 617 additions and 473 deletions
@ -0,0 +1,112 @@ |
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/****************************************************************************
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* |
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* wofftypes.h |
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* |
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* Basic WOFF/WOFF2 type definitions and interface (specification |
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* only). |
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* |
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* Copyright (C) 1996-2019 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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#ifndef WOFFTYPES_H_ |
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#define WOFFTYPES_H_ |
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#include <ft2build.h> |
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#include FT_TRUETYPE_TABLES_H |
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#include FT_INTERNAL_OBJECTS_H |
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FT_BEGIN_HEADER |
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/**************************************************************************
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* |
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* @struct: |
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* WOFF_HeaderRec |
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* |
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* @description: |
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* WOFF file format header. |
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* |
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* @fields: |
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* See |
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* |
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* https://www.w3.org/TR/WOFF/#WOFFHeader
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*/ |
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typedef struct WOFF_HeaderRec_ |
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{ |
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FT_ULong signature; |
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FT_ULong flavor; |
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FT_ULong length; |
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FT_UShort num_tables; |
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FT_UShort reserved; |
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FT_ULong totalSfntSize; |
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FT_UShort majorVersion; |
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FT_UShort minorVersion; |
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FT_ULong metaOffset; |
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FT_ULong metaLength; |
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FT_ULong metaOrigLength; |
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FT_ULong privOffset; |
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FT_ULong privLength; |
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} WOFF_HeaderRec, *WOFF_Header; |
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/**************************************************************************
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* |
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* @struct: |
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* WOFF_TableRec |
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* |
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* @description: |
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* This structure describes a given table of a WOFF font. |
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* |
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* @fields: |
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* Tag :: |
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* A four-bytes tag describing the table. |
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* |
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* Offset :: |
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* The offset of the table from the start of the WOFF font in its |
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* resource. |
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* |
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* CompLength :: |
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* Compressed table length (in bytes). |
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* |
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* OrigLength :: |
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* Uncompressed table length (in bytes). |
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* |
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* CheckSum :: |
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* The table checksum. This value can be ignored. |
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* |
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* OrigOffset :: |
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* The uncompressed table file offset. This value gets computed while |
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* constructing the (uncompressed) SFNT header. It is not contained in |
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* the WOFF file. |
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*/ |
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typedef struct WOFF_TableRec_ |
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{ |
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FT_ULong Tag; /* table ID */ |
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FT_ULong Offset; /* table file offset */ |
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FT_ULong CompLength; /* compressed table length */ |
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FT_ULong OrigLength; /* uncompressed table length */ |
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FT_ULong CheckSum; /* uncompressed checksum */ |
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FT_ULong OrigOffset; /* uncompressed table file offset */ |
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/* (not in the WOFF file) */ |
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} WOFF_TableRec, *WOFF_Table; |
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FT_END_HEADER |
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#endif /* WOFFTYPES_H_ */ |
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/* END */ |
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@ -0,0 +1,434 @@ |
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/****************************************************************************
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* |
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* sfwoff.c |
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* |
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* WOFF format management (base). |
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* |
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* Copyright (C) 1996-2019 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 "sfwoff.h" |
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#include FT_TRUETYPE_TAGS_H |
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#include FT_INTERNAL_DEBUG_H |
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#include FT_INTERNAL_STREAM_H |
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#include FT_GZIP_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 sfwoff |
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#define WRITE_USHORT( p, v ) \ |
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do \
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{ \
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*(p)++ = (FT_Byte)( (v) >> 8 ); \
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*(p)++ = (FT_Byte)( (v) >> 0 ); \
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\
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} while ( 0 ) |
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#define WRITE_ULONG( p, v ) \ |
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do \
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{ \
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*(p)++ = (FT_Byte)( (v) >> 24 ); \
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*(p)++ = (FT_Byte)( (v) >> 16 ); \
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*(p)++ = (FT_Byte)( (v) >> 8 ); \
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*(p)++ = (FT_Byte)( (v) >> 0 ); \
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\
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} while ( 0 ) |
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static void |
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sfnt_stream_close( FT_Stream stream ) |
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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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stream->size = 0; |
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stream->base = NULL; |
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stream->close = NULL; |
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} |
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FT_CALLBACK_DEF( int ) |
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compare_offsets( const void* a, |
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const void* b ) |
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{ |
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WOFF_Table table1 = *(WOFF_Table*)a; |
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WOFF_Table table2 = *(WOFF_Table*)b; |
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FT_ULong offset1 = table1->Offset; |
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FT_ULong offset2 = table2->Offset; |
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if ( offset1 > offset2 ) |
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return 1; |
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else if ( offset1 < offset2 ) |
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return -1; |
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else |
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return 0; |
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} |
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/* Replace `face->root.stream' with a stream containing the extracted */ |
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/* SFNT of a WOFF font. */ |
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FT_LOCAL_DEF( FT_Error ) |
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woff_open_font( FT_Stream stream, |
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TT_Face face ) |
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{ |
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FT_Memory memory = stream->memory; |
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FT_Error error = FT_Err_Ok; |
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WOFF_HeaderRec woff; |
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WOFF_Table tables = NULL; |
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WOFF_Table* indices = NULL; |
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FT_ULong woff_offset; |
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FT_Byte* sfnt = NULL; |
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FT_Stream sfnt_stream = NULL; |
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FT_Byte* sfnt_header; |
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FT_ULong sfnt_offset; |
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FT_Int nn; |
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FT_ULong old_tag = 0; |
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static const FT_Frame_Field woff_header_fields[] = |
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{ |
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#undef FT_STRUCTURE |
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#define FT_STRUCTURE WOFF_HeaderRec |
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FT_FRAME_START( 44 ), |
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FT_FRAME_ULONG ( signature ), |
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FT_FRAME_ULONG ( flavor ), |
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FT_FRAME_ULONG ( length ), |
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FT_FRAME_USHORT( num_tables ), |
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FT_FRAME_USHORT( reserved ), |
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FT_FRAME_ULONG ( totalSfntSize ), |
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FT_FRAME_USHORT( majorVersion ), |
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FT_FRAME_USHORT( minorVersion ), |
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FT_FRAME_ULONG ( metaOffset ), |
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FT_FRAME_ULONG ( metaLength ), |
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FT_FRAME_ULONG ( metaOrigLength ), |
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FT_FRAME_ULONG ( privOffset ), |
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FT_FRAME_ULONG ( privLength ), |
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FT_FRAME_END |
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}; |
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FT_ASSERT( stream == face->root.stream ); |
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FT_ASSERT( FT_STREAM_POS() == 0 ); |
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if ( FT_STREAM_READ_FIELDS( woff_header_fields, &woff ) ) |
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return error; |
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/* Make sure we don't recurse back here or hit TTC code. */ |
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if ( woff.flavor == TTAG_wOFF || woff.flavor == TTAG_ttcf ) |
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return FT_THROW( Invalid_Table ); |
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/* Miscellaneous checks. */ |
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if ( woff.length != stream->size || |
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woff.num_tables == 0 || |
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44 + woff.num_tables * 20UL >= woff.length || |
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12 + woff.num_tables * 16UL >= woff.totalSfntSize || |
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( woff.totalSfntSize & 3 ) != 0 || |
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( woff.metaOffset == 0 && ( woff.metaLength != 0 || |
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woff.metaOrigLength != 0 ) ) || |
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( woff.metaLength != 0 && woff.metaOrigLength == 0 ) || |
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( woff.privOffset == 0 && woff.privLength != 0 ) ) |
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{ |
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FT_ERROR(( "woff_font_open: invalid WOFF header\n" )); |
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return FT_THROW( Invalid_Table ); |
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} |
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/* Don't trust `totalSfntSize' before thorough checks. */ |
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if ( FT_ALLOC( sfnt, 12 + woff.num_tables * 16UL ) || |
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FT_NEW( sfnt_stream ) ) |
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goto Exit; |
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sfnt_header = sfnt; |
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/* Write sfnt header. */ |
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{ |
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FT_UInt searchRange, entrySelector, rangeShift, x; |
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x = woff.num_tables; |
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entrySelector = 0; |
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while ( x ) |
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{ |
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x >>= 1; |
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entrySelector += 1; |
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} |
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entrySelector--; |
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searchRange = ( 1 << entrySelector ) * 16; |
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rangeShift = woff.num_tables * 16 - searchRange; |
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WRITE_ULONG ( sfnt_header, woff.flavor ); |
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WRITE_USHORT( sfnt_header, woff.num_tables ); |
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WRITE_USHORT( sfnt_header, searchRange ); |
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WRITE_USHORT( sfnt_header, entrySelector ); |
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WRITE_USHORT( sfnt_header, rangeShift ); |
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} |
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/* While the entries in the sfnt header must be sorted by the */ |
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/* tag value, the tables themselves are not. We thus have to */ |
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/* sort them by offset and check that they don't overlap. */ |
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if ( FT_NEW_ARRAY( tables, woff.num_tables ) || |
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FT_NEW_ARRAY( indices, woff.num_tables ) ) |
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goto Exit; |
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FT_TRACE2(( "\n" |
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" tag offset compLen origLen checksum\n" |
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" -------------------------------------------\n" )); |
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if ( FT_FRAME_ENTER( 20L * woff.num_tables ) ) |
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goto Exit; |
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for ( nn = 0; nn < woff.num_tables; nn++ ) |
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{ |
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WOFF_Table table = tables + nn; |
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table->Tag = FT_GET_TAG4(); |
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table->Offset = FT_GET_ULONG(); |
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table->CompLength = FT_GET_ULONG(); |
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table->OrigLength = FT_GET_ULONG(); |
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table->CheckSum = FT_GET_ULONG(); |
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FT_TRACE2(( " %c%c%c%c %08lx %08lx %08lx %08lx\n", |
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(FT_Char)( table->Tag >> 24 ), |
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(FT_Char)( table->Tag >> 16 ), |
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(FT_Char)( table->Tag >> 8 ), |
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(FT_Char)( table->Tag ), |
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table->Offset, |
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table->CompLength, |
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table->OrigLength, |
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table->CheckSum )); |
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if ( table->Tag <= old_tag ) |
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{ |
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FT_FRAME_EXIT(); |
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FT_ERROR(( "woff_font_open: table tags are not sorted\n" )); |
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error = FT_THROW( Invalid_Table ); |
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goto Exit; |
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} |
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old_tag = table->Tag; |
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indices[nn] = table; |
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} |
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FT_FRAME_EXIT(); |
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/* Sort by offset. */ |
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ft_qsort( indices, |
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woff.num_tables, |
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sizeof ( WOFF_Table ), |
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compare_offsets ); |
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/* Check offsets and lengths. */ |
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woff_offset = 44 + woff.num_tables * 20L; |
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sfnt_offset = 12 + woff.num_tables * 16L; |
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for ( nn = 0; nn < woff.num_tables; nn++ ) |
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{ |
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WOFF_Table table = indices[nn]; |
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if ( table->Offset != woff_offset || |
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table->CompLength > woff.length || |
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table->Offset > woff.length - table->CompLength || |
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table->OrigLength > woff.totalSfntSize || |
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sfnt_offset > woff.totalSfntSize - table->OrigLength || |
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table->CompLength > table->OrigLength ) |
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{ |
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FT_ERROR(( "woff_font_open: invalid table offsets\n" )); |
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error = FT_THROW( Invalid_Table ); |
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goto Exit; |
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} |
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table->OrigOffset = sfnt_offset; |
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/* The offsets must be multiples of 4. */ |
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woff_offset += ( table->CompLength + 3 ) & ~3U; |
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sfnt_offset += ( table->OrigLength + 3 ) & ~3U; |
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} |
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|
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/*
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* Final checks! |
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* |
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* We don't decode and check the metadata block. |
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* We don't check table checksums either. |
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* But other than those, I think we implement all |
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* `MUST' checks from the spec. |
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*/ |
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|
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if ( woff.metaOffset ) |
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{ |
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if ( woff.metaOffset != woff_offset || |
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woff.metaOffset + woff.metaLength > woff.length ) |
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{ |
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FT_ERROR(( "woff_font_open:" |
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" invalid `metadata' offset or length\n" )); |
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error = FT_THROW( Invalid_Table ); |
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goto Exit; |
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} |
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|
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/* We have padding only ... */ |
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woff_offset += woff.metaLength; |
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} |
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|
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if ( woff.privOffset ) |
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{ |
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/* ... if it isn't the last block. */ |
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woff_offset = ( woff_offset + 3 ) & ~3U; |
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|
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if ( woff.privOffset != woff_offset || |
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woff.privOffset + woff.privLength > woff.length ) |
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{ |
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FT_ERROR(( "woff_font_open: invalid `private' offset or length\n" )); |
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error = FT_THROW( Invalid_Table ); |
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goto Exit; |
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} |
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|
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/* No padding for the last block. */ |
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woff_offset += woff.privLength; |
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} |
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|
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if ( sfnt_offset != woff.totalSfntSize || |
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woff_offset != woff.length ) |
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{ |
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FT_ERROR(( "woff_font_open: invalid `sfnt' table structure\n" )); |
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error = FT_THROW( Invalid_Table ); |
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goto Exit; |
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} |
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|
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/* Now use `totalSfntSize'. */ |
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if ( FT_REALLOC( sfnt, |
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12 + woff.num_tables * 16UL, |
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woff.totalSfntSize ) ) |
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goto Exit; |
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|
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sfnt_header = sfnt + 12; |
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|
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/* Write the tables. */ |
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|
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for ( nn = 0; nn < woff.num_tables; nn++ ) |
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{ |
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WOFF_Table table = tables + nn; |
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|
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|
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/* Write SFNT table entry. */ |
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WRITE_ULONG( sfnt_header, table->Tag ); |
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WRITE_ULONG( sfnt_header, table->CheckSum ); |
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WRITE_ULONG( sfnt_header, table->OrigOffset ); |
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WRITE_ULONG( sfnt_header, table->OrigLength ); |
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|
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/* Write table data. */ |
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if ( FT_STREAM_SEEK( table->Offset ) || |
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FT_FRAME_ENTER( table->CompLength ) ) |
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goto Exit; |
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|
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if ( table->CompLength == table->OrigLength ) |
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{ |
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/* Uncompressed data; just copy. */ |
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ft_memcpy( sfnt + table->OrigOffset, |
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stream->cursor, |
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table->OrigLength ); |
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} |
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else |
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{ |
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#ifdef FT_CONFIG_OPTION_USE_ZLIB |
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|
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/* Uncompress with zlib. */ |
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FT_ULong output_len = table->OrigLength; |
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|
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|
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error = FT_Gzip_Uncompress( memory, |
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sfnt + table->OrigOffset, &output_len, |
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stream->cursor, table->CompLength ); |
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if ( error ) |
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goto Exit; |
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if ( output_len != table->OrigLength ) |
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{ |
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FT_ERROR(( "woff_font_open: compressed table length mismatch\n" )); |
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error = FT_THROW( Invalid_Table ); |
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goto Exit; |
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} |
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|
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#else /* !FT_CONFIG_OPTION_USE_ZLIB */ |
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|
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error = FT_THROW( Unimplemented_Feature ); |
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goto Exit; |
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|
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#endif /* !FT_CONFIG_OPTION_USE_ZLIB */ |
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} |
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|
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FT_FRAME_EXIT(); |
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|
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/* We don't check whether the padding bytes in the WOFF file are */ |
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/* actually '\0'. For the output, however, we do set them properly. */ |
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sfnt_offset = table->OrigOffset + table->OrigLength; |
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while ( sfnt_offset & 3 ) |
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{ |
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sfnt[sfnt_offset] = '\0'; |
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sfnt_offset++; |
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} |
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} |
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|
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/* Ok! Finally ready. Swap out stream and return. */ |
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FT_Stream_OpenMemory( sfnt_stream, sfnt, woff.totalSfntSize ); |
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sfnt_stream->memory = stream->memory; |
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sfnt_stream->close = sfnt_stream_close; |
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|
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FT_Stream_Free( |
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face->root.stream, |
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( face->root.face_flags & FT_FACE_FLAG_EXTERNAL_STREAM ) != 0 ); |
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|
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face->root.stream = sfnt_stream; |
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|
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face->root.face_flags &= ~FT_FACE_FLAG_EXTERNAL_STREAM; |
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|
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Exit: |
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FT_FREE( tables ); |
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FT_FREE( indices ); |
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|
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if ( error ) |
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{ |
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FT_FREE( sfnt ); |
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FT_Stream_Close( sfnt_stream ); |
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FT_FREE( sfnt_stream ); |
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} |
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|
||||
return error; |
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} |
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|
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|
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#undef WRITE_USHORT |
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#undef WRITE_ULONG |
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|
||||
|
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/* END */ |
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@ -0,0 +1,41 @@ |
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/****************************************************************************
|
||||
* |
||||
* sfwoff.h |
||||
* |
||||
* WOFFF format management (specification). |
||||
* |
||||
* Copyright (C) 1996-2019 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. |
||||
* |
||||
*/ |
||||
|
||||
|
||||
#ifndef SFWOFF_H_ |
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#define SFWOFF_H_ |
||||
|
||||
|
||||
#include <ft2build.h> |
||||
#include FT_INTERNAL_SFNT_H |
||||
#include FT_INTERNAL_OBJECTS_H |
||||
|
||||
|
||||
FT_BEGIN_HEADER |
||||
|
||||
|
||||
FT_LOCAL( FT_Error ) |
||||
woff_open_font( FT_Stream stream, |
||||
TT_Face face ); |
||||
|
||||
|
||||
FT_END_HEADER |
||||
|
||||
#endif /* SFWOFF_H_ */ |
||||
|
||||
|
||||
/* END */ |
||||
Loading…
Reference in new issue