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[woff2] More formatting and documentation. 

* include/freetype/internal/wofftypes.h, src/sfnt/sfwoff2.c: Implement
formatting changes suggested as

  https://lists.nongnu.org/archive/html/freetype-devel/2019-08/msg00052.html
This commit is contained in:
Nikhil Ramakrishnan 2019-08-21 20:21:02 +05:30
parent 25774f3da5
commit 933c185b7e
2 changed files with 103 additions and 68 deletions
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38
include/freetype/internal/wofftypes.h
View File

@ -120,12 +120,6 @@ FT_BEGIN_HEADER
* Number of tables in TTC, indicating number of elements in
* `table_indices`.
*
* dst_offset ::
* Uncompressed table offset.
*
* header_checksum ::
* Checksum for font header.
*
* table_indices ::
* Array of table indices for each TTC font.
*/
@ -133,8 +127,6 @@ FT_BEGIN_HEADER
{
FT_ULong flavor;
FT_UShort num_tables;
FT_ULong dst_offset;
FT_ULong header_checksum;
FT_UShort* table_indices;
} WOFF2_TtcFontRec, *WOFF2_TtcFont;
@ -157,7 +149,7 @@ FT_BEGIN_HEADER
* We don't care about the fields `reserved`, `majorVersion` and
* `minorVersion`, so they are not included. The `totalSfntSize` field
* does not necessarily represent the actual size of the uncompressed
* SFNT font stream, so that is not included either.
* SFNT font stream, so that is used as a reference value instead.
*/
typedef struct WOFF2_HeaderRec_
{
@ -173,13 +165,13 @@ FT_BEGIN_HEADER
FT_ULong privOffset;
FT_ULong privLength;
FT_ULong uncompressed_size;
FT_ULong compressed_offset;
FT_ULong header_version;
FT_UShort num_fonts;
FT_ULong actual_sfnt_size;
FT_ULong uncompressed_size; /* uncompressed brotli stream size */
FT_ULong compressed_offset; /* compressed stream offset */
FT_ULong header_version; /* version of original TTC Header */
FT_UShort num_fonts; /* number of fonts in TTC */
FT_ULong actual_sfnt_size; /* actual size of sfnt stream */
WOFF2_TtcFont ttc_fonts;
WOFF2_TtcFont ttc_fonts; /* metadata for fonts in a TTC */
} WOFF2_HeaderRec, *WOFF2_Header;
@ -194,14 +186,17 @@ FT_BEGIN_HEADER
* sfnt tables.
*
* @fields:
* header_checksum ::
* Checksum of SFNT offset table.
*
* num_glyphs ::
* Number of glyphs in the font.
*
* num_hmetrics ::
* `numberOfHMetrics' field in the `hhea' table.
* `numberOfHMetrics` field in the 'hhea' table.
*
* x_mins ::
* `xMin' values of glyph bounding box.
* `xMin` values of glyph bounding box.
*/
typedef struct WOFF2_InfoRec_
{
@ -236,7 +231,6 @@ FT_BEGIN_HEADER
FT_ULong flags; /* calculated flags */
FT_ULong src_offset; /* compressed table offset */
FT_ULong src_length; /* compressed table length */
FT_ULong dst_offset; /* uncompressed table offset */
} WOFF2_TableRec, *WOFF2_Table;
@ -249,7 +243,7 @@ FT_BEGIN_HEADER
*
* @description:
* This structure stores information about a substream in the transformed
* `glyf' table in a WOFF2 stream.
* 'glyf' table in a WOFF2 stream.
*
* @fields:
* start ::
@ -266,6 +260,7 @@ FT_BEGIN_HEADER
FT_ULong start;
FT_ULong offset;
FT_ULong size;
} WOFF2_SubstreamRec, *WOFF2_Substream;
@ -276,7 +271,7 @@ FT_BEGIN_HEADER
*
* @description:
* This structure stores information about a point in the transformed
* `glyf' table in a WOFF2 stream.
* 'glyf' table in a WOFF2 stream.
*
* @fields:
* x ::
@ -286,13 +281,14 @@ FT_BEGIN_HEADER
* y-coordinate.
*
* on_curve ::
* on-curve.
* Whether point is on-curve.
*/
typedef struct WOFF2_PointRec_
{
FT_Int x;
FT_Int y;
FT_Bool on_curve;
} WOFF2_PointRec, *WOFF2_Point;

133
src/sfnt/sfwoff2.c
View File

@ -135,6 +135,7 @@
FT_Byte result_byte = 0;
FT_UShort result_short = 0;
if ( FT_READ_BYTE( code ) )
return error;
if ( code == wordCode )
@ -176,7 +177,9 @@
FT_Byte code;
FT_Error error = FT_Err_Ok;
for ( i = 0; i < 5; ++i ) {
for ( i = 0; i < 5; ++i )
{
code = 0;
if ( FT_READ_BYTE( code ) )
return error;
@ -215,7 +218,8 @@
/* We are reallocating memory for `dst', so its pointer may change. */
FT_Byte* dst = *dst_bytes;
/* Check if we are within limits. */
/* Check whether we are within limits. */
if ( ( *offset + size ) > WOFF2_DEFAULT_MAX_SIZE )
return FT_THROW( Array_Too_Large );
@ -256,6 +260,7 @@
FT_Byte zeroes[] = { 0, 0, 0 };
FT_ULong pad_bytes;
if ( dest_offset + 3 < dest_offset )
return FT_THROW( Invalid_Table );
@ -281,6 +286,7 @@
FT_ULong i;
FT_ULong v;
for ( i = 0; i < aligned_size; i += 4 )
{
checksum += ( buf[i] << 24 ) | ( buf[i+1] << 16 ) |
@ -310,15 +316,16 @@
FT_ULong uncompressed_size = dst_size;
BrotliDecoderResult result;
result = BrotliDecoderDecompress(
src_size, src, &uncompressed_size, dst);
if ( result != BROTLI_DECODER_RESULT_SUCCESS ||
uncompressed_size != dst_size )
{
FT_ERROR(( "woff2_decompress: Stream length mismatch.\n" ));
return FT_THROW( Invalid_Table );
}
{
FT_ERROR(( "woff2_decompress: Stream length mismatch.\n" ));
return FT_THROW( Invalid_Table );
}
FT_TRACE2(( "woff2_decompress: Brotli stream decompressed.\n" ));
return FT_Err_Ok;
@ -339,6 +346,7 @@
{
FT_Int i;
for ( i = 0; i < num_tables; i++ )
{
if ( tables[i]->Tag == tag )
@ -357,6 +365,7 @@
FT_Error error = FT_Err_Ok;
FT_UShort num_metrics;
if ( FT_STREAM_SKIP( 34 ) )
return FT_THROW( Invalid_Table );
@ -411,6 +420,7 @@
FT_Int i;
if ( n_points > in_size )
return FT_THROW( Invalid_Table );
@ -418,6 +428,8 @@
{
FT_Byte flag = flags_in[i];
FT_Bool on_curve = !( flag >> 7 );
flag &= 0x7f;
if ( flag < 84 )
data_bytes = 1;
@ -506,20 +518,20 @@
FT_ULong dst_size,
FT_ULong* glyph_size )
{
FT_UInt flag_offset = 10 + ( 2 * n_contours ) + 2 + instruction_len;
FT_Int last_flag = -1;
FT_Int repeat_count = 0;
FT_Int last_x = 0;
FT_Int last_y = 0;
FT_UInt x_bytes = 0;
FT_UInt y_bytes = 0;
FT_UInt xy_bytes;
FT_UInt i;
FT_UInt x_offset;
FT_UInt y_offset;
FT_UInt flag_offset = 10 + ( 2 * n_contours ) + 2 + instruction_len;
FT_Int last_flag = -1;
FT_Int repeat_count = 0;
FT_Int last_x = 0;
FT_Int last_y = 0;
FT_UInt x_bytes = 0;
FT_UInt y_bytes = 0;
FT_UInt xy_bytes;
FT_UInt i;
FT_UInt x_offset;
FT_UInt y_offset;
FT_Byte* pointer;
for ( i = 0; i < n_points; ++i )
{
const WOFF2_PointRec point = points[i];
@ -528,6 +540,7 @@
FT_Int dx = point.x - last_x;
FT_Int dy = point.y - last_y;
if ( dx == 0 )
flag |= GLYF_THIS_X_IS_SAME;
else if ( dx > -256 && dx < 256 )
@ -641,6 +654,7 @@
FT_ULong offset;
FT_Byte* pointer;
if ( n_points > 0 )
{
x_min = points[0].x;
@ -682,6 +696,7 @@
FT_Bool we_have_inst = FALSE;
FT_UShort flags = FLAG_MORE_COMPONENTS;
if ( FT_STREAM_SEEK( start_offset ) )
goto Exit;
while ( flags & FLAG_MORE_COMPONENTS )
@ -712,8 +727,8 @@
*size = FT_STREAM_POS() - start_offset;
*have_instructions = we_have_inst;
Exit:
return error;
Exit:
return error;
}
@ -739,6 +754,7 @@
const FT_ULong offset_size = index_format ? 4 : 2;
if ( ( loca_values_size << 2 ) >> 2 != loca_values_size )
goto Fail;
@ -750,6 +766,8 @@
for ( i = 0; i < loca_values_size; i++ )
{
FT_ULong value = loca_values[i];
if ( index_format )
WRITE_ULONG( dst, value );
else
@ -768,13 +786,13 @@
FT_FREE( loca_buf );
return error;
Fail:
if ( !error )
error = FT_THROW( Invalid_Table );
Fail:
if ( !error )
error = FT_THROW( Invalid_Table );
FT_FREE( loca_buf );
FT_FREE( loca_buf );
return error;
return error;
}
@ -818,6 +836,7 @@
FT_Byte* glyph_buf = NULL;
WOFF2_Point points = NULL;
if ( FT_NEW_ARRAY( substreams, num_substreams ) )
goto Fail;
@ -849,6 +868,8 @@
for ( i = 0; i < num_substreams; ++i )
{
FT_ULong substream_size;
if ( FT_READ_ULONG( substream_size ) )
goto Fail;
if ( substream_size > glyf_table->TransformLength - offset )
@ -889,6 +910,7 @@
FT_ULong bbox_offset;
FT_UShort x_min;
/* Set `have_bbox'. */
bbox_offset = bbox_bitmap_offset + ( i >> 3 );
if ( FT_STREAM_SEEK( bbox_offset ) ||
@ -912,6 +934,7 @@
FT_ULong size_needed;
FT_Byte* pointer = NULL;
/* Composite glyphs must have explicit bbox. */
if ( !have_bbox )
goto Fail;
@ -990,6 +1013,7 @@
FT_Byte* pointer = NULL;
if ( FT_NEW_ARRAY( n_points_arr, n_contours ) )
goto Fail;
@ -1149,17 +1173,17 @@
return error;
Fail:
if ( !error )
error = FT_THROW( Invalid_Table );
Fail:
if ( !error )
error = FT_THROW( Invalid_Table );
FT_FREE( substreams );
FT_FREE( loca_values );
FT_FREE( n_points_arr );
FT_FREE( glyph_buf );
FT_FREE( points );
FT_FREE( substreams );
FT_FREE( loca_values );
FT_FREE( n_points_arr );
FT_FREE( glyph_buf );
FT_FREE( points );
return error;
return error;
}
@ -1189,6 +1213,7 @@
const WOFF2_Table head_table = find_table( tables, num_tables,
TTAG_head );
/* Read `numGlyphs' from maxp table. */
if ( FT_STREAM_SEEK( maxp_table->src_offset ) && FT_STREAM_SKIP( 8 ) )
return error;
@ -1273,6 +1298,7 @@
FT_Byte* hmtx_table = NULL;
FT_Byte* dst = NULL;
if ( FT_READ_BYTE( hmtx_flags ) )
goto Fail;
@ -1292,7 +1318,7 @@
( num_hmetrics < 1 ) )
goto Fail;
/* Must have atleast one entry. */
/* Must have at least one entry. */
if ( num_hmetrics < 1 )
goto Fail;
@ -1305,6 +1331,7 @@
{
FT_UShort advance_width;
if ( FT_READ_USHORT( advance_width ) )
goto Fail;
@ -1316,6 +1343,7 @@
{
FT_Short lsb;
if ( has_proportional_lsbs )
{
if ( FT_READ_SHORT( lsb ) )
@ -1332,6 +1360,7 @@
{
FT_Short lsb;
if ( has_monospace_lsbs )
{
if ( FT_READ_SHORT( lsb ) )
@ -1374,10 +1403,11 @@
return error;
Fail:
if ( !error )
error = FT_THROW( Invalid_Table );
return error;
Fail:
if ( !error )
error = FT_THROW( Invalid_Table );
return error;
}
@ -1419,6 +1449,7 @@
const WOFF2_Table loca_table = find_table( indices, num_tables,
TTAG_loca );
if ( ( !glyf_table && loca_table ) ||
( !loca_table && glyf_table ) )
{
@ -1455,6 +1486,7 @@
{
WOFF2_TableRec table = *( indices[nn] );
FT_TRACE3(( "Seeking to %d with table size %d.\n",
table.src_offset, table.src_length ));
FT_TRACE3(( "Table tag: %c%c%c%c.\n",
@ -1481,7 +1513,7 @@
checksum = 0;
if ( ( table.flags & WOFF2_FLAGS_TRANSFORM ) != WOFF2_FLAGS_TRANSFORM )
{
/* Check if `head' is atleast 12 bytes. */
/* Check whether `head' is at least 12 bytes. */
if ( table.Tag == TTAG_head )
{
if ( table.src_length < 12 )
@ -1591,15 +1623,15 @@
return error;
Fail:
if ( !error )
error = FT_THROW( Invalid_Table );
Fail:
if ( !error )
error = FT_THROW( Invalid_Table );
FT_FREE( table_entry );
FT_Stream_Close( stream );
FT_FREE( stream );
FT_FREE( table_entry );
FT_Stream_Close( stream );
FT_FREE( stream );
return error;
return error;
}
@ -1662,6 +1694,7 @@
FT_FRAME_END
};
FT_ASSERT( stream == face->root.stream );
FT_ASSERT( FT_STREAM_POS() == 0 );
@ -1716,6 +1749,8 @@
for ( nn = 0; nn < woff2.num_tables; nn++ )
{
WOFF2_Table table = tables + nn;
if ( FT_READ_BYTE( table->FlagByte ) )
goto Exit;
@ -1824,6 +1859,7 @@
{
WOFF2_TtcFont ttc_font = woff2.ttc_fonts + nn;
if ( READ_255USHORT( ttc_font->num_tables ) )
goto Exit;
if ( FT_READ_ULONG( ttc_font->flavor ) )
@ -1845,6 +1881,7 @@
FT_UShort table_index;
WOFF2_Table table;
if ( READ_255USHORT( table_index ) )
goto Exit;
@ -1934,6 +1971,7 @@
{
WOFF2_TtcFont ttc_font = woff2.ttc_fonts + face_index;
/* Create a temporary array. */
if ( FT_NEW_ARRAY( temp_indices,
ttc_font->num_tables ) )
@ -1975,6 +2013,7 @@
{
FT_UInt searchRange, entrySelector, rangeShift, x;
x = woff2.num_tables;
entrySelector = 0;
while ( x )