/**************************************************************************** * * sfwoff2.c * * WOFF2 format management (base). * * Copyright (C) 2019-2023 by * Nikhil Ramakrishnan, 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 "sfwoff2.h" #include "woff2tags.h" #include <freetype/tttags.h> #include <freetype/internal/ftdebug.h> #include <freetype/internal/ftstream.h> #ifdef FT_CONFIG_OPTION_USE_BROTLI #include <brotli/decode.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 … /* An arbitrary, heuristic size limit (67MByte) for expanded WOFF2 data. */ #define MAX_SFNT_SIZE … #define READ_255USHORT … #define READ_BASE128 … /* `var' should be FT_ULong */ #define ROUND4 … #define WRITE_USHORT … #define WRITE_ULONG … #define WRITE_SHORT … #define WRITE_SFNT_BUF … #define WRITE_SFNT_BUF_AT … #define N_CONTOUR_STREAM … #define N_POINTS_STREAM … #define FLAG_STREAM … #define GLYPH_STREAM … #define COMPOSITE_STREAM … #define BBOX_STREAM … #define INSTRUCTION_STREAM … #define HAVE_OVERLAP_SIMPLE_BITMAP … static void stream_close( FT_Stream stream ) { … } FT_COMPARE_DEF( int ) compare_tags( const void* a, const void* b ) { … } static FT_Error Read255UShort( FT_Stream stream, FT_UShort* value ) { … } static FT_Error ReadBase128( FT_Stream stream, FT_ULong* value ) { … } /* Extend memory of `dst_bytes' buffer and copy data from `src'. */ static FT_Error write_buf( FT_Byte** dst_bytes, FT_ULong* dst_size, FT_ULong* offset, FT_Byte* src, FT_ULong size, FT_Memory memory ) { … } /* Pad buffer to closest multiple of 4. */ static FT_Error pad4( FT_Byte** sfnt_bytes, FT_ULong* sfnt_size, FT_ULong* out_offset, FT_Memory memory ) { … } /* Calculate table checksum of `buf'. */ static FT_ULong compute_ULong_sum( FT_Byte* buf, FT_ULong size ) { … } static FT_Error woff2_decompress( FT_Byte* dst, FT_ULong dst_size, const FT_Byte* src, FT_ULong src_size ) { … } static WOFF2_Table find_table( WOFF2_Table* tables, FT_UShort num_tables, FT_Tag tag ) { … } /* Read `numberOfHMetrics' field from `hhea' table. */ static FT_Error read_num_hmetrics( FT_Stream stream, FT_UShort* num_hmetrics ) { … } /* An auxiliary function for overflow-safe addition. */ static FT_Int with_sign( FT_Byte flag, FT_Int base_val ) { … } /* An auxiliary function for overflow-safe addition. */ static FT_Int safe_int_addition( FT_Int a, FT_Int b, FT_Int* result ) { … } /* * Decode variable-length (flag, xCoordinate, yCoordinate) triplet for a * simple glyph. See * * https://www.w3.org/TR/WOFF2/#triplet_decoding */ static FT_Error triplet_decode( const FT_Byte* flags_in, const FT_Byte* in, FT_ULong in_size, FT_ULong n_points, WOFF2_Point result, FT_ULong* in_bytes_used ) { … } /* Store decoded points in glyph buffer. */ static FT_Error store_points( FT_ULong n_points, const WOFF2_Point points, FT_UShort n_contours, FT_UShort instruction_len, FT_Bool have_overlap, FT_Byte* dst, FT_ULong dst_size, FT_ULong* glyph_size ) { … } static void compute_bbox( FT_ULong n_points, const WOFF2_Point points, FT_Byte* dst, FT_UShort* src_x_min ) { … } static FT_Error compositeGlyph_size( FT_Stream stream, FT_ULong offset, FT_ULong* size, FT_Bool* have_instructions ) { … } /* Store loca values (provided by `reconstruct_glyf') to output stream. */ static FT_Error store_loca( FT_ULong* loca_values, FT_ULong loca_values_size, FT_UShort index_format, FT_ULong* checksum, FT_Byte** sfnt_bytes, FT_ULong* sfnt_size, FT_ULong* out_offset, FT_Memory memory ) { … } static FT_Error reconstruct_glyf( FT_Stream stream, FT_ULong* glyf_checksum, FT_ULong* loca_checksum, FT_Byte** sfnt_bytes, FT_ULong* sfnt_size, FT_ULong* out_offset, WOFF2_Info info, FT_Memory memory ) { … } /* Get `x_mins' for untransformed `glyf' table. */ static FT_Error get_x_mins( FT_Stream stream, WOFF2_Table* tables, FT_UShort num_tables, WOFF2_Info info, FT_Memory memory ) { … } static FT_Error reconstruct_hmtx( FT_Stream stream, FT_UShort num_glyphs, FT_UShort num_hmetrics, FT_Short* x_mins, FT_ULong* checksum, FT_Byte** sfnt_bytes, FT_ULong* sfnt_size, FT_ULong* out_offset, FT_Memory memory ) { … } static FT_Error reconstruct_font( FT_Byte* transformed_buf, FT_ULong transformed_buf_size, WOFF2_Table* indices, WOFF2_Header woff2, WOFF2_Info info, FT_Byte** sfnt_bytes, FT_ULong* sfnt_size, FT_Memory memory ) { … } /* Replace `face->root.stream' with a stream containing the extracted */ /* SFNT of a WOFF2 font. */ FT_LOCAL_DEF( FT_Error ) woff2_open_font( FT_Stream stream, TT_Face face, FT_Int* face_instance_index, FT_Long* num_faces ) { … } #undef READ_255USHORT #undef READ_BASE128 #undef ROUND4 #undef WRITE_USHORT #undef WRITE_ULONG #undef WRITE_SHORT #undef WRITE_SFNT_BUF #undef WRITE_SFNT_BUF_AT #undef N_CONTOUR_STREAM #undef N_POINTS_STREAM #undef FLAG_STREAM #undef GLYPH_STREAM #undef COMPOSITE_STREAM #undef BBOX_STREAM #undef INSTRUCTION_STREAM #else /* !FT_CONFIG_OPTION_USE_BROTLI */ /* ANSI C doesn't like empty source files */ typedef int sfwoff2_dummy_; #endif /* !FT_CONFIG_OPTION_USE_BROTLI */ /* END */
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