Add comprehensive fuzzer suite for improved OSS-Fuzz coverage #1615
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This PR adds 10 new fuzz targets to significantly improve code coverage from the current ~50% to an estimated 85-95%. The new fuzzers cover previously untested code paths including: New fuzz targets: - opj_compress_fuzzer: Basic encoder fuzzing - opj_tile_fuzzer: Tile-based decoding (opj_get_decoded_tile, etc.) - opj_decode_area_fuzzer: Partial area decoding with threading - opj_roundtrip_fuzzer: Encode-then-decode for encoder validation - opj_components_fuzzer: Selective component decoding - opj_tiled_encoder_fuzzer: Tile-based encoding (opj_write_tile) - opj_dump_info_fuzzer: Metadata/index APIs (opj_get_cstr_info, etc.) - opj_mct_fuzzer: MCT matrices and cinema profiles - opj_encoder_options_fuzzer: Extended options (PLT, TLM, GUARD_BITS) - opj_subsampled_fuzzer: Subsampling patterns and ROI encoding Additional improvements: - Add JPEG 2000 dictionary (80+ tokens) for guided fuzzing - Add synthetic seed corpus for encoder fuzzers - Add options files for slow fuzzers (timeout/max_len settings) - Update build script to support all new fuzzers and copy resources Previously uncovered functions now tested: - opj_write_tile, opj_image_tile_create - opj_get_decoded_tile, opj_read_tile_header, opj_decode_tile_data - opj_set_decode_area, opj_set_decoded_components - opj_set_MCT, opj_encoder_set_extra_options - opj_get_cstr_info, opj_get_cstr_index, opj_dump_codec - opj_decoder_set_strict_mode, opj_codec_set_threads
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Summary
This PR adds 10 new fuzz targets to significantly improve OSS-Fuzz code coverage from the current ~50% to an estimated 85-95%. The new fuzzers cover previously untested code paths including encoder APIs, tile-based operations, MCT, and metadata functions.
New Fuzz Targets
opj_compress_fuzzeropj_tile_fuzzeropj_get_decoded_tile, etc.)opj_decode_area_fuzzeropj_roundtrip_fuzzeropj_components_fuzzeropj_tiled_encoder_fuzzeropj_write_tile)opj_dump_info_fuzzeropj_mct_fuzzeropj_encoder_options_fuzzeropj_subsampled_fuzzerAdditional Improvements
Previously Uncovered Functions Now Tested
opj_write_tile,opj_image_tile_createopj_get_decoded_tile,opj_read_tile_header,opj_decode_tile_dataopj_set_decode_area,opj_set_decoded_componentsopj_set_MCT,opj_encoder_set_extra_optionsopj_get_cstr_info,opj_get_cstr_index,opj_dump_codecopj_decoder_set_strict_mode,opj_codec_set_threadsTest Plan