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freetype2
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Code Issues 4 Releases Wiki Activity

[sfnt] Separate WOFF sources and headers. 

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.
This commit is contained in:
Nikhil Ramakrishnan 2019-05-30 23:57:34 +05:30
parent f0de218ced
commit 7b275a5af1
11 changed files with 617 additions and 473 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
ChangeLog
View File

@ -1,3 +1,27 @@
2019-05-30 Nikhil Ramakrishnan <ramakrishnan.nikhil@gmail.com>
[sfnt] Separate WOFF sources and headers.
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.
2019-05-30 Werner Lemberg <wl@gnu.org>
[base] Fix `make multi'.

1
include/freetype/internal/fttrace.h
View File

@ -48,6 +48,7 @@ FT_TRACE_DEF( cache ) /* cache sub-system (ftcache.c, etc.) */
/* SFNT driver components */
FT_TRACE_DEF( sfdriver ) /* SFNT font driver (sfdriver.c) */
FT_TRACE_DEF( sfobjs ) /* SFNT object handler (sfobjs.c) */
FT_TRACE_DEF( sfwoff ) /* WOFF format handler (sfwoff.c) */
FT_TRACE_DEF( ttbdf ) /* TrueType embedded BDF (ttbdf.c) */
FT_TRACE_DEF( ttcmap ) /* charmap handler (ttcmap.c) */
FT_TRACE_DEF( ttcolr ) /* glyph layer table (ttcolr.c) */

1
include/freetype/internal/internal.h
View File

@ -40,6 +40,7 @@
#define FT_INTERNAL_TRUETYPE_TYPES_H <freetype/internal/tttypes.h>
#define FT_INTERNAL_TYPE1_TYPES_H <freetype/internal/t1types.h>
#define FT_INTERNAL_WOFF_TYPES_H <freetype/internal/wofftypes.h>
#define FT_INTERNAL_POSTSCRIPT_AUX_H <freetype/internal/psaux.h>
#define FT_INTERNAL_POSTSCRIPT_HINTS_H <freetype/internal/pshints.h>

1
include/freetype/internal/sfnt.h
View File

@ -23,6 +23,7 @@
#include <ft2build.h>
#include FT_INTERNAL_DRIVER_H
#include FT_INTERNAL_TRUETYPE_TYPES_H
#include FT_INTERNAL_WOFF_TYPES_H
FT_BEGIN_HEADER

75
include/freetype/internal/tttypes.h
View File

@ -150,81 +150,6 @@ FT_BEGIN_HEADER
} TT_TableRec, *TT_Table;
/**************************************************************************
*
* @struct:
* WOFF_HeaderRec
*
* @description:
* WOFF file format header.
*
* @fields:
* See
*
* https://www.w3.org/TR/WOFF/#WOFFHeader
*/
typedef struct WOFF_HeaderRec_
{
FT_ULong signature;
FT_ULong flavor;
FT_ULong length;
FT_UShort num_tables;
FT_UShort reserved;
FT_ULong totalSfntSize;
FT_UShort majorVersion;
FT_UShort minorVersion;
FT_ULong metaOffset;
FT_ULong metaLength;
FT_ULong metaOrigLength;
FT_ULong privOffset;
FT_ULong privLength;
} WOFF_HeaderRec, *WOFF_Header;
/**************************************************************************
*
* @struct:
* WOFF_TableRec
*
* @description:
* This structure describes a given table of a WOFF font.
*
* @fields:
* Tag ::
* A four-bytes tag describing the table.
*
* Offset ::
* The offset of the table from the start of the WOFF font in its
* resource.
*
* CompLength ::
* Compressed table length (in bytes).
*
* OrigLength ::
* Uncompressed table length (in bytes).
*
* CheckSum ::
* The table checksum. This value can be ignored.
*
* OrigOffset ::
* The uncompressed table file offset. This value gets computed while
* constructing the (uncompressed) SFNT header. It is not contained in
* the WOFF file.
*/
typedef struct WOFF_TableRec_
{
FT_ULong Tag; /* table ID */
FT_ULong Offset; /* table file offset */
FT_ULong CompLength; /* compressed table length */
FT_ULong OrigLength; /* uncompressed table length */
FT_ULong CheckSum; /* uncompressed checksum */
FT_ULong OrigOffset; /* uncompressed table file offset */
/* (not in the WOFF file) */
} WOFF_TableRec, *WOFF_Table;
/**************************************************************************
*
* @struct:

112
include/freetype/internal/wofftypes.h Normal file
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@ -0,0 +1,112 @@
/****************************************************************************
*
* wofftypes.h
*
* Basic WOFF/WOFF2 type definitions and interface (specification
* only).
*
* 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 WOFFTYPES_H_
#define WOFFTYPES_H_
#include <ft2build.h>
#include FT_TRUETYPE_TABLES_H
#include FT_INTERNAL_OBJECTS_H
FT_BEGIN_HEADER
/**************************************************************************
*
* @struct:
* WOFF_HeaderRec
*
* @description:
* WOFF file format header.
*
* @fields:
* See
*
* https://www.w3.org/TR/WOFF/#WOFFHeader
*/
typedef struct WOFF_HeaderRec_
{
FT_ULong signature;
FT_ULong flavor;
FT_ULong length;
FT_UShort num_tables;
FT_UShort reserved;
FT_ULong totalSfntSize;
FT_UShort majorVersion;
FT_UShort minorVersion;
FT_ULong metaOffset;
FT_ULong metaLength;
FT_ULong metaOrigLength;
FT_ULong privOffset;
FT_ULong privLength;
} WOFF_HeaderRec, *WOFF_Header;
/**************************************************************************
*
* @struct:
* WOFF_TableRec
*
* @description:
* This structure describes a given table of a WOFF font.
*
* @fields:
* Tag ::
* A four-bytes tag describing the table.
*
* Offset ::
* The offset of the table from the start of the WOFF font in its
* resource.
*
* CompLength ::
* Compressed table length (in bytes).
*
* OrigLength ::
* Uncompressed table length (in bytes).
*
* CheckSum ::
* The table checksum. This value can be ignored.
*
* OrigOffset ::
* The uncompressed table file offset. This value gets computed while
* constructing the (uncompressed) SFNT header. It is not contained in
* the WOFF file.
*/
typedef struct WOFF_TableRec_
{
FT_ULong Tag; /* table ID */
FT_ULong Offset; /* table file offset */
FT_ULong CompLength; /* compressed table length */
FT_ULong OrigLength; /* uncompressed table length */
FT_ULong CheckSum; /* uncompressed checksum */
FT_ULong OrigOffset; /* uncompressed table file offset */
/* (not in the WOFF file) */
} WOFF_TableRec, *WOFF_Table;
FT_END_HEADER
#endif /* WOFFTYPES_H_ */
/* END */

1
src/sfnt/rules.mk
View File

@ -31,6 +31,7 @@ SFNT_COMPILE := $(CC) $(ANSIFLAGS) \
SFNT_DRV_SRC := $(SFNT_DIR)/pngshim.c \
$(SFNT_DIR)/sfdriver.c \
$(SFNT_DIR)/sfobjs.c \
$(SFNT_DIR)/sfwoff.c \
$(SFNT_DIR)/ttbdf.c \
$(SFNT_DIR)/ttcmap.c \
$(SFNT_DIR)/ttcolr.c \

1
src/sfnt/sfnt.c
View File

@ -22,6 +22,7 @@
#include "pngshim.c"
#include "sfdriver.c"
#include "sfobjs.c"
#include "sfwoff.c"
#include "ttbdf.c"
#include "ttcmap.c"
#include "ttcolr.c"

399
src/sfnt/sfobjs.c
View File

@ -21,13 +21,13 @@
#include "ttload.h"
#include "ttcmap.h"
#include "ttkern.h"
#include "sfwoff.h"
#include FT_INTERNAL_SFNT_H
#include FT_INTERNAL_DEBUG_H
#include FT_TRUETYPE_IDS_H
#include FT_TRUETYPE_TAGS_H
#include FT_SERVICE_POSTSCRIPT_CMAPS_H
#include FT_SFNT_NAMES_H
#include FT_GZIP_H
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
#include FT_SERVICE_MULTIPLE_MASTERS_H
@ -337,403 +337,6 @@
}
#define WRITE_USHORT( p, v ) \
do \
{ \
*(p)++ = (FT_Byte)( (v) >> 8 ); \
*(p)++ = (FT_Byte)( (v) >> 0 ); \
\
} while ( 0 )
#define WRITE_ULONG( p, v ) \
do \
{ \
*(p)++ = (FT_Byte)( (v) >> 24 ); \
*(p)++ = (FT_Byte)( (v) >> 16 ); \
*(p)++ = (FT_Byte)( (v) >> 8 ); \
*(p)++ = (FT_Byte)( (v) >> 0 ); \
\
} while ( 0 )
static void
sfnt_stream_close( FT_Stream stream )
{
FT_Memory memory = stream->memory;
FT_FREE( stream->base );
stream->size = 0;
stream->base = NULL;
stream->close = NULL;
}
FT_CALLBACK_DEF( int )
compare_offsets( const void* a,
const void* b )
{
WOFF_Table table1 = *(WOFF_Table*)a;
WOFF_Table table2 = *(WOFF_Table*)b;
FT_ULong offset1 = table1->Offset;
FT_ULong offset2 = table2->Offset;
if ( offset1 > offset2 )
return 1;
else if ( offset1 < offset2 )
return -1;
else
return 0;
}
/* Replace `face->root.stream' with a stream containing the extracted */
/* SFNT of a WOFF font. */
static FT_Error
woff_open_font( FT_Stream stream,
TT_Face face )
{
FT_Memory memory = stream->memory;
FT_Error error = FT_Err_Ok;
WOFF_HeaderRec woff;
WOFF_Table tables = NULL;
WOFF_Table* indices = NULL;
FT_ULong woff_offset;
FT_Byte* sfnt = NULL;
FT_Stream sfnt_stream = NULL;
FT_Byte* sfnt_header;
FT_ULong sfnt_offset;
FT_Int nn;
FT_ULong old_tag = 0;
static const FT_Frame_Field woff_header_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE WOFF_HeaderRec
FT_FRAME_START( 44 ),
FT_FRAME_ULONG ( signature ),
FT_FRAME_ULONG ( flavor ),
FT_FRAME_ULONG ( length ),
FT_FRAME_USHORT( num_tables ),
FT_FRAME_USHORT( reserved ),
FT_FRAME_ULONG ( totalSfntSize ),
FT_FRAME_USHORT( majorVersion ),
FT_FRAME_USHORT( minorVersion ),
FT_FRAME_ULONG ( metaOffset ),
FT_FRAME_ULONG ( metaLength ),
FT_FRAME_ULONG ( metaOrigLength ),
FT_FRAME_ULONG ( privOffset ),
FT_FRAME_ULONG ( privLength ),
FT_FRAME_END
};
FT_ASSERT( stream == face->root.stream );
FT_ASSERT( FT_STREAM_POS() == 0 );
if ( FT_STREAM_READ_FIELDS( woff_header_fields, &woff ) )
return error;
/* Make sure we don't recurse back here or hit TTC code. */
if ( woff.flavor == TTAG_wOFF || woff.flavor == TTAG_ttcf )
return FT_THROW( Invalid_Table );
/* Miscellaneous checks. */
if ( woff.length != stream->size ||
woff.num_tables == 0 ||
44 + woff.num_tables * 20UL >= woff.length ||
12 + woff.num_tables * 16UL >= woff.totalSfntSize ||
( woff.totalSfntSize & 3 ) != 0 ||
( woff.metaOffset == 0 && ( woff.metaLength != 0 ||
woff.metaOrigLength != 0 ) ) ||
( woff.metaLength != 0 && woff.metaOrigLength == 0 ) ||
( woff.privOffset == 0 && woff.privLength != 0 ) )
{
FT_ERROR(( "woff_font_open: invalid WOFF header\n" ));
return FT_THROW( Invalid_Table );
}
/* Don't trust `totalSfntSize' before thorough checks. */
if ( FT_ALLOC( sfnt, 12 + woff.num_tables * 16UL ) ||
FT_NEW( sfnt_stream ) )
goto Exit;
sfnt_header = sfnt;
/* Write sfnt header. */
{
FT_UInt searchRange, entrySelector, rangeShift, x;
x = woff.num_tables;
entrySelector = 0;
while ( x )
{
x >>= 1;
entrySelector += 1;
}
entrySelector--;
searchRange = ( 1 << entrySelector ) * 16;
rangeShift = woff.num_tables * 16 - searchRange;
WRITE_ULONG ( sfnt_header, woff.flavor );
WRITE_USHORT( sfnt_header, woff.num_tables );
WRITE_USHORT( sfnt_header, searchRange );
WRITE_USHORT( sfnt_header, entrySelector );
WRITE_USHORT( sfnt_header, rangeShift );
}
/* While the entries in the sfnt header must be sorted by the */
/* tag value, the tables themselves are not. We thus have to */
/* sort them by offset and check that they don't overlap. */
if ( FT_NEW_ARRAY( tables, woff.num_tables ) ||
FT_NEW_ARRAY( indices, woff.num_tables ) )
goto Exit;
FT_TRACE2(( "\n"
" tag offset compLen origLen checksum\n"
" -------------------------------------------\n" ));
if ( FT_FRAME_ENTER( 20L * woff.num_tables ) )
goto Exit;
for ( nn = 0; nn < woff.num_tables; nn++ )
{
WOFF_Table table = tables + nn;
table->Tag = FT_GET_TAG4();
table->Offset = FT_GET_ULONG();
table->CompLength = FT_GET_ULONG();
table->OrigLength = FT_GET_ULONG();
table->CheckSum = FT_GET_ULONG();
FT_TRACE2(( " %c%c%c%c %08lx %08lx %08lx %08lx\n",
(FT_Char)( table->Tag >> 24 ),
(FT_Char)( table->Tag >> 16 ),
(FT_Char)( table->Tag >> 8 ),
(FT_Char)( table->Tag ),
table->Offset,
table->CompLength,
table->OrigLength,
table->CheckSum ));
if ( table->Tag <= old_tag )
{
FT_FRAME_EXIT();
FT_ERROR(( "woff_font_open: table tags are not sorted\n" ));
error = FT_THROW( Invalid_Table );
goto Exit;
}
old_tag = table->Tag;
indices[nn] = table;
}
FT_FRAME_EXIT();
/* Sort by offset. */
ft_qsort( indices,
woff.num_tables,
sizeof ( WOFF_Table ),
compare_offsets );
/* Check offsets and lengths. */
woff_offset = 44 + woff.num_tables * 20L;
sfnt_offset = 12 + woff.num_tables * 16L;
for ( nn = 0; nn < woff.num_tables; nn++ )
{
WOFF_Table table = indices[nn];
if ( table->Offset != woff_offset ||
table->CompLength > woff.length ||
table->Offset > woff.length - table->CompLength ||
table->OrigLength > woff.totalSfntSize ||
sfnt_offset > woff.totalSfntSize - table->OrigLength ||
table->CompLength > table->OrigLength )
{
FT_ERROR(( "woff_font_open: invalid table offsets\n" ));
error = FT_THROW( Invalid_Table );
goto Exit;
}
table->OrigOffset = sfnt_offset;
/* The offsets must be multiples of 4. */
woff_offset += ( table->CompLength + 3 ) & ~3U;
sfnt_offset += ( table->OrigLength + 3 ) & ~3U;
}
/*
* Final checks!
*
* We don't decode and check the metadata block.
* We don't check table checksums either.
* But other than those, I think we implement all
* `MUST' checks from the spec.
*/
if ( woff.metaOffset )
{
if ( woff.metaOffset != woff_offset ||
woff.metaOffset + woff.metaLength > woff.length )
{
FT_ERROR(( "woff_font_open:"
" invalid `metadata' offset or length\n" ));
error = FT_THROW( Invalid_Table );
goto Exit;
}
/* We have padding only ... */
woff_offset += woff.metaLength;
}
if ( woff.privOffset )
{
/* ... if it isn't the last block. */
woff_offset = ( woff_offset + 3 ) & ~3U;
if ( woff.privOffset != woff_offset ||
woff.privOffset + woff.privLength > woff.length )
{
FT_ERROR(( "woff_font_open: invalid `private' offset or length\n" ));
error = FT_THROW( Invalid_Table );
goto Exit;
}
/* No padding for the last block. */
woff_offset += woff.privLength;
}
if ( sfnt_offset != woff.totalSfntSize ||
woff_offset != woff.length )
{
FT_ERROR(( "woff_font_open: invalid `sfnt' table structure\n" ));
error = FT_THROW( Invalid_Table );
goto Exit;
}
/* Now use `totalSfntSize'. */
if ( FT_REALLOC( sfnt,
12 + woff.num_tables * 16UL,
woff.totalSfntSize ) )
goto Exit;
sfnt_header = sfnt + 12;
/* Write the tables. */
for ( nn = 0; nn < woff.num_tables; nn++ )
{
WOFF_Table table = tables + nn;
/* Write SFNT table entry. */
WRITE_ULONG( sfnt_header, table->Tag );
WRITE_ULONG( sfnt_header, table->CheckSum );
WRITE_ULONG( sfnt_header, table->OrigOffset );
WRITE_ULONG( sfnt_header, table->OrigLength );
/* Write table data. */
if ( FT_STREAM_SEEK( table->Offset ) ||
FT_FRAME_ENTER( table->CompLength ) )
goto Exit;
if ( table->CompLength == table->OrigLength )
{
/* Uncompressed data; just copy. */
ft_memcpy( sfnt + table->OrigOffset,
stream->cursor,
table->OrigLength );
}
else
{
#ifdef FT_CONFIG_OPTION_USE_ZLIB
/* Uncompress with zlib. */
FT_ULong output_len = table->OrigLength;
error = FT_Gzip_Uncompress( memory,
sfnt + table->OrigOffset, &output_len,
stream->cursor, table->CompLength );
if ( error )
goto Exit;
if ( output_len != table->OrigLength )
{
FT_ERROR(( "woff_font_open: compressed table length mismatch\n" ));
error = FT_THROW( Invalid_Table );
goto Exit;
}
#else /* !FT_CONFIG_OPTION_USE_ZLIB */
error = FT_THROW( Unimplemented_Feature );
goto Exit;
#endif /* !FT_CONFIG_OPTION_USE_ZLIB */
}
FT_FRAME_EXIT();
/* We don't check whether the padding bytes in the WOFF file are */
/* actually '\0'. For the output, however, we do set them properly. */
sfnt_offset = table->OrigOffset + table->OrigLength;
while ( sfnt_offset & 3 )
{
sfnt[sfnt_offset] = '\0';
sfnt_offset++;
}
}
/* Ok! Finally ready. Swap out stream and return. */
FT_Stream_OpenMemory( sfnt_stream, sfnt, woff.totalSfntSize );
sfnt_stream->memory = stream->memory;
sfnt_stream->close = sfnt_stream_close;
FT_Stream_Free(
face->root.stream,
( face->root.face_flags & FT_FACE_FLAG_EXTERNAL_STREAM ) != 0 );
face->root.stream = sfnt_stream;
face->root.face_flags &= ~FT_FACE_FLAG_EXTERNAL_STREAM;
Exit:
FT_FREE( tables );
FT_FREE( indices );
if ( error )
{
FT_FREE( sfnt );
FT_Stream_Close( sfnt_stream );
FT_FREE( sfnt_stream );
}
return error;
}
#undef WRITE_USHORT
#undef WRITE_ULONG
/* Fill in face->ttc_header. If the font is not a TTC, it is */
/* synthesized into a TTC with one offset table. */
static FT_Error

434
src/sfnt/sfwoff.c Normal file
View File

@ -0,0 +1,434 @@
/****************************************************************************
*
* sfwoff.c
*
* WOFF format management (base).
*
* 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.
*
*/
#include <ft2build.h>
#include "sfwoff.h"
#include FT_TRUETYPE_TAGS_H
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_STREAM_H
#include FT_GZIP_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 sfwoff
#define WRITE_USHORT( p, v ) \
do \
{ \
*(p)++ = (FT_Byte)( (v) >> 8 ); \
*(p)++ = (FT_Byte)( (v) >> 0 ); \
\
} while ( 0 )
#define WRITE_ULONG( p, v ) \
do \
{ \
*(p)++ = (FT_Byte)( (v) >> 24 ); \
*(p)++ = (FT_Byte)( (v) >> 16 ); \
*(p)++ = (FT_Byte)( (v) >> 8 ); \
*(p)++ = (FT_Byte)( (v) >> 0 ); \
\
} while ( 0 )
static void
sfnt_stream_close( FT_Stream stream )
{
FT_Memory memory = stream->memory;
FT_FREE( stream->base );
stream->size = 0;
stream->base = NULL;
stream->close = NULL;
}
FT_CALLBACK_DEF( int )
compare_offsets( const void* a,
const void* b )
{
WOFF_Table table1 = *(WOFF_Table*)a;
WOFF_Table table2 = *(WOFF_Table*)b;
FT_ULong offset1 = table1->Offset;
FT_ULong offset2 = table2->Offset;
if ( offset1 > offset2 )
return 1;
else if ( offset1 < offset2 )
return -1;
else
return 0;
}
/* Replace `face->root.stream' with a stream containing the extracted */
/* SFNT of a WOFF font. */
FT_LOCAL_DEF( FT_Error )
woff_open_font( FT_Stream stream,
TT_Face face )
{
FT_Memory memory = stream->memory;
FT_Error error = FT_Err_Ok;
WOFF_HeaderRec woff;
WOFF_Table tables = NULL;
WOFF_Table* indices = NULL;
FT_ULong woff_offset;
FT_Byte* sfnt = NULL;
FT_Stream sfnt_stream = NULL;
FT_Byte* sfnt_header;
FT_ULong sfnt_offset;
FT_Int nn;
FT_ULong old_tag = 0;
static const FT_Frame_Field woff_header_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE WOFF_HeaderRec
FT_FRAME_START( 44 ),
FT_FRAME_ULONG ( signature ),
FT_FRAME_ULONG ( flavor ),
FT_FRAME_ULONG ( length ),
FT_FRAME_USHORT( num_tables ),
FT_FRAME_USHORT( reserved ),
FT_FRAME_ULONG ( totalSfntSize ),
FT_FRAME_USHORT( majorVersion ),
FT_FRAME_USHORT( minorVersion ),
FT_FRAME_ULONG ( metaOffset ),
FT_FRAME_ULONG ( metaLength ),
FT_FRAME_ULONG ( metaOrigLength ),
FT_FRAME_ULONG ( privOffset ),
FT_FRAME_ULONG ( privLength ),
FT_FRAME_END
};
FT_ASSERT( stream == face->root.stream );
FT_ASSERT( FT_STREAM_POS() == 0 );
if ( FT_STREAM_READ_FIELDS( woff_header_fields, &woff ) )
return error;
/* Make sure we don't recurse back here or hit TTC code. */
if ( woff.flavor == TTAG_wOFF || woff.flavor == TTAG_ttcf )
return FT_THROW( Invalid_Table );
/* Miscellaneous checks. */
if ( woff.length != stream->size ||
woff.num_tables == 0 ||
44 + woff.num_tables * 20UL >= woff.length ||
12 + woff.num_tables * 16UL >= woff.totalSfntSize ||
( woff.totalSfntSize & 3 ) != 0 ||
( woff.metaOffset == 0 && ( woff.metaLength != 0 ||
woff.metaOrigLength != 0 ) ) ||
( woff.metaLength != 0 && woff.metaOrigLength == 0 ) ||
( woff.privOffset == 0 && woff.privLength != 0 ) )
{
FT_ERROR(( "woff_font_open: invalid WOFF header\n" ));
return FT_THROW( Invalid_Table );
}
/* Don't trust `totalSfntSize' before thorough checks. */
if ( FT_ALLOC( sfnt, 12 + woff.num_tables * 16UL ) ||
FT_NEW( sfnt_stream ) )
goto Exit;
sfnt_header = sfnt;
/* Write sfnt header. */
{
FT_UInt searchRange, entrySelector, rangeShift, x;
x = woff.num_tables;
entrySelector = 0;
while ( x )
{
x >>= 1;
entrySelector += 1;
}
entrySelector--;
searchRange = ( 1 << entrySelector ) * 16;
rangeShift = woff.num_tables * 16 - searchRange;
WRITE_ULONG ( sfnt_header, woff.flavor );
WRITE_USHORT( sfnt_header, woff.num_tables );
WRITE_USHORT( sfnt_header, searchRange );
WRITE_USHORT( sfnt_header, entrySelector );
WRITE_USHORT( sfnt_header, rangeShift );
}
/* While the entries in the sfnt header must be sorted by the */
/* tag value, the tables themselves are not. We thus have to */
/* sort them by offset and check that they don't overlap. */
if ( FT_NEW_ARRAY( tables, woff.num_tables ) ||
FT_NEW_ARRAY( indices, woff.num_tables ) )
goto Exit;
FT_TRACE2(( "\n"
" tag offset compLen origLen checksum\n"
" -------------------------------------------\n" ));
if ( FT_FRAME_ENTER( 20L * woff.num_tables ) )
goto Exit;
for ( nn = 0; nn < woff.num_tables; nn++ )
{
WOFF_Table table = tables + nn;
table->Tag = FT_GET_TAG4();
table->Offset = FT_GET_ULONG();
table->CompLength = FT_GET_ULONG();
table->OrigLength = FT_GET_ULONG();
table->CheckSum = FT_GET_ULONG();
FT_TRACE2(( " %c%c%c%c %08lx %08lx %08lx %08lx\n",
(FT_Char)( table->Tag >> 24 ),
(FT_Char)( table->Tag >> 16 ),
(FT_Char)( table->Tag >> 8 ),
(FT_Char)( table->Tag ),
table->Offset,
table->CompLength,
table->OrigLength,
table->CheckSum ));
if ( table->Tag <= old_tag )
{
FT_FRAME_EXIT();
FT_ERROR(( "woff_font_open: table tags are not sorted\n" ));
error = FT_THROW( Invalid_Table );
goto Exit;
}
old_tag = table->Tag;
indices[nn] = table;
}
FT_FRAME_EXIT();
/* Sort by offset. */
ft_qsort( indices,
woff.num_tables,
sizeof ( WOFF_Table ),
compare_offsets );
/* Check offsets and lengths. */
woff_offset = 44 + woff.num_tables * 20L;
sfnt_offset = 12 + woff.num_tables * 16L;
for ( nn = 0; nn < woff.num_tables; nn++ )
{
WOFF_Table table = indices[nn];
if ( table->Offset != woff_offset ||
table->CompLength > woff.length ||
table->Offset > woff.length - table->CompLength ||
table->OrigLength > woff.totalSfntSize ||
sfnt_offset > woff.totalSfntSize - table->OrigLength ||
table->CompLength > table->OrigLength )
{
FT_ERROR(( "woff_font_open: invalid table offsets\n" ));
error = FT_THROW( Invalid_Table );
goto Exit;
}
table->OrigOffset = sfnt_offset;
/* The offsets must be multiples of 4. */
woff_offset += ( table->CompLength + 3 ) & ~3U;
sfnt_offset += ( table->OrigLength + 3 ) & ~3U;
}
/*
* Final checks!
*
* We don't decode and check the metadata block.
* We don't check table checksums either.
* But other than those, I think we implement all
* `MUST' checks from the spec.
*/
if ( woff.metaOffset )
{
if ( woff.metaOffset != woff_offset ||
woff.metaOffset + woff.metaLength > woff.length )
{
FT_ERROR(( "woff_font_open:"
" invalid `metadata' offset or length\n" ));
error = FT_THROW( Invalid_Table );
goto Exit;
}
/* We have padding only ... */
woff_offset += woff.metaLength;
}
if ( woff.privOffset )
{
/* ... if it isn't the last block. */
woff_offset = ( woff_offset + 3 ) & ~3U;
if ( woff.privOffset != woff_offset ||
woff.privOffset + woff.privLength > woff.length )
{
FT_ERROR(( "woff_font_open: invalid `private' offset or length\n" ));
error = FT_THROW( Invalid_Table );
goto Exit;
}
/* No padding for the last block. */
woff_offset += woff.privLength;
}
if ( sfnt_offset != woff.totalSfntSize ||
woff_offset != woff.length )
{
FT_ERROR(( "woff_font_open: invalid `sfnt' table structure\n" ));
error = FT_THROW( Invalid_Table );
goto Exit;
}
/* Now use `totalSfntSize'. */
if ( FT_REALLOC( sfnt,
12 + woff.num_tables * 16UL,
woff.totalSfntSize ) )
goto Exit;
sfnt_header = sfnt + 12;
/* Write the tables. */
for ( nn = 0; nn < woff.num_tables; nn++ )
{
WOFF_Table table = tables + nn;
/* Write SFNT table entry. */
WRITE_ULONG( sfnt_header, table->Tag );
WRITE_ULONG( sfnt_header, table->CheckSum );
WRITE_ULONG( sfnt_header, table->OrigOffset );
WRITE_ULONG( sfnt_header, table->OrigLength );
/* Write table data. */
if ( FT_STREAM_SEEK( table->Offset ) ||
FT_FRAME_ENTER( table->CompLength ) )
goto Exit;
if ( table->CompLength == table->OrigLength )
{
/* Uncompressed data; just copy. */
ft_memcpy( sfnt + table->OrigOffset,
stream->cursor,
table->OrigLength );
}
else
{
#ifdef FT_CONFIG_OPTION_USE_ZLIB
/* Uncompress with zlib. */
FT_ULong output_len = table->OrigLength;
error = FT_Gzip_Uncompress( memory,
sfnt + table->OrigOffset, &output_len,
stream->cursor, table->CompLength );
if ( error )
goto Exit;
if ( output_len != table->OrigLength )
{
FT_ERROR(( "woff_font_open: compressed table length mismatch\n" ));
error = FT_THROW( Invalid_Table );
goto Exit;
}
#else /* !FT_CONFIG_OPTION_USE_ZLIB */
error = FT_THROW( Unimplemented_Feature );
goto Exit;
#endif /* !FT_CONFIG_OPTION_USE_ZLIB */
}
FT_FRAME_EXIT();
/* We don't check whether the padding bytes in the WOFF file are */
/* actually '\0'. For the output, however, we do set them properly. */
sfnt_offset = table->OrigOffset + table->OrigLength;
while ( sfnt_offset & 3 )
{
sfnt[sfnt_offset] = '\0';
sfnt_offset++;
}
}
/* Ok! Finally ready. Swap out stream and return. */
FT_Stream_OpenMemory( sfnt_stream, sfnt, woff.totalSfntSize );
sfnt_stream->memory = stream->memory;
sfnt_stream->close = sfnt_stream_close;
FT_Stream_Free(
face->root.stream,
( face->root.face_flags & FT_FACE_FLAG_EXTERNAL_STREAM ) != 0 );
face->root.stream = sfnt_stream;
face->root.face_flags &= ~FT_FACE_FLAG_EXTERNAL_STREAM;
Exit:
FT_FREE( tables );
FT_FREE( indices );
if ( error )
{
FT_FREE( sfnt );
FT_Stream_Close( sfnt_stream );
FT_FREE( sfnt_stream );
}
return error;
}
#undef WRITE_USHORT
#undef WRITE_ULONG
/* END */

41
src/sfnt/sfwoff.h Normal file
View File

@ -0,0 +1,41 @@
/****************************************************************************
*
* 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_
#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 */