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Diffstat (limited to 'Build/source/libs/freetype2/freetype-src/src/tools/ftfuzzer/rasterfuzzer.cc')
-rw-r--r-- | Build/source/libs/freetype2/freetype-src/src/tools/ftfuzzer/rasterfuzzer.cc | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/Build/source/libs/freetype2/freetype-src/src/tools/ftfuzzer/rasterfuzzer.cc b/Build/source/libs/freetype2/freetype-src/src/tools/ftfuzzer/rasterfuzzer.cc new file mode 100644 index 00000000000..05187b0be80 --- /dev/null +++ b/Build/source/libs/freetype2/freetype-src/src/tools/ftfuzzer/rasterfuzzer.cc @@ -0,0 +1,129 @@ +// rasterfuzzer.cc +// +// A fuzzing function to test FreeType's rasterizers with libFuzzer. +// +// Copyright 2016 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 <stdint.h> + +#include <vector> + + + using namespace std; + + +#include <ft2build.h> + +#include FT_FREETYPE_H +#include FT_IMAGE_H +#include FT_OUTLINE_H + + + static FT_Library library; + static int InitResult; + + + struct FT_Global { + FT_Global() { + InitResult = FT_Init_FreeType( &library ); + } + ~FT_Global() { + FT_Done_FreeType( library ); + } + }; + + FT_Global global_ft; + + + extern "C" int + LLVMFuzzerTestOneInput( const uint8_t* data, + size_t size_ ) + { + unsigned char pixels[4]; + + FT_Bitmap bitmap_mono = { + 1, // rows + 1, // width + 4, // pitch + pixels, // buffer + 2, // num_grays + FT_PIXEL_MODE_MONO, // pixel_mode + 0, // palette_mode + NULL // palette + }; + + FT_Bitmap bitmap_gray = { + 1, // rows + 1, // width + 4, // pitch + pixels, // buffer + 256, // num_grays + FT_PIXEL_MODE_GRAY, // pixel_mode + 0, // palette_mode + NULL // palette + }; + + const size_t vsize = sizeof ( FT_Vector ); + const size_t tsize = sizeof ( char ); + + // we use the input data for both points and tags + short n_points = short( size_ / ( vsize + tsize ) ); + if ( n_points <= 2 ) + return 0; + + FT_Vector* points = reinterpret_cast<FT_Vector*>( + const_cast<uint8_t*>( + data ) ); + char* tags = reinterpret_cast<char*>( + const_cast<uint8_t*>( + data + size_t( n_points ) * vsize ) ); + + // to reduce the number of invalid outlines that are immediately + // rejected in `FT_Outline_Render', limit values to 2^18 pixels + // (i.e., 2^24 bits) + for ( short i = 0; i < n_points; i++ ) + { + if ( points[i].x == LONG_MIN ) + points[i].x = 0; + else if ( points[i].x < 0 ) + points[i].x = -( -points[i].x & 0xFFFFFF ) - 1; + else + points[i].x = ( points[i].x & 0xFFFFFF ) + 1; + + if ( points[i].y == LONG_MIN ) + points[i].y = 0; + else if ( points[i].y < 0 ) + points[i].y = -( -points[i].y & 0xFFFFFF ) - 1; + else + points[i].y = ( points[i].y & 0xFFFFFF ) + 1; + } + + short contours[1]; + contours[0] = n_points - 1; + + FT_Outline outline = + { + 1, // n_contours + n_points, // n_points + points, // points + tags, // tags + contours, // contours + FT_OUTLINE_NONE // flags + }; + + FT_Outline_Get_Bitmap( library, &outline, &bitmap_mono ); + FT_Outline_Get_Bitmap( library, &outline, &bitmap_gray ); + + return 0; + } + + +// END |