As @HeroicKatora suggested, I made a PR directly here, this is supposed to continue the work done on image-png#99.

As I said over there, this PR takes the existing code and adds APNG encoding functionality, maintaining backwards compatibility, but is not supposed to be merged in it's current state. I'd like to hear suggestion from others on how to make it better.

APNG related features:

• [x] encode frames
• [x] set a separate default image
• [x] set different frame rate for each frame
• [x] encode frames that don't fill the frame
• [x] set the default dispose and blend operation
• [x] set the dispose and blend operation for each frame
• [x] set the filter type for each write

num-iter is used just for range_step iterator. By using std::iter::step_by we can remove a lot of bloat:

`-- num-iter v0.1.39
    |-- num-integer v0.1.41
    |   `-- num-traits v0.2.8
    |       [build-dependencies]
    |       `-- autocfg v0.1.4
    |   [build-dependencies]
    |   `-- autocfg v0.1.4 (*)
    `-- num-traits v0.2.8 (*)
    [build-dependencies]
    `-- autocfg v0.1.4 (*)

This also decreases the build time: 4.9s vs 6.7s

The afl fuzzer target in ./png-afl currently exits with SIGABRT as soon as any decoding errors occurs, causing AFL to think for example "CRC mismatch" is a crashing input file.

inflate crate is only used by png, with no other high-profile users. Everybody else uses either libflate or flate2 crates, since they're much faster and have better compatibility.

Since version 0.1.25 libflate carries just one trivial unsafe block (I've killed off everything else), so its safety story is as good as inflate. There seems to be no reason not to switch.

I want to write a PNG to memory. I wrote code like this:

    let mut encoder = png::Encoder::new(Cursor::new(Vec::new()), info.width, info.height);
    encoder.set_color(png::ColorType::RGB);
    encoder.set_depth(info.bit_depth);
    let mut writer = encoder.write_header()?;
    writer.write_image_data(&frame)?;
    let cursor = writer.into_inner();
    let bytes = cursor.into_inner();

I can't get the bytes back out without an into_inner() function. The line let cursor = writer.into_inner(); fails to compile because there's no .into_inner() function.

Multiple files from png-afl/fuzzing_seeds folder throw pngcheck into an infinite loop. Tested on commit 4f2e8eb44586442133c0222e47e1eb762aaef5a5

Steps to reproduce:

# build pngcheck with crc32 verification disabled
RUSTFLAGS='--cfg=fuzzing' cargo build --release --example pngcheck
# run the test
for file in png-afl/fuzzing_seeds/id_00*; do timeout --foreground 10 target/release/examples/pngcheck "$file"; if [ $? -eq 124 ]; then echo "timed out: $file"; fi  ; done

Non-exhaustive list of inputs triggering the issue:

 png-afl/fuzzing_seeds/id_000004,orig_08448590481e56783c09eb8e1ef74079454eb436
 png-afl/fuzzing_seeds/id_000005,orig_10e3f54adc22168afa151c8af62d7941025284dc
 png-afl/fuzzing_seeds/id_000019,orig_2c13c7b51cd4a954b66841aa011919091d360178
 png-afl/fuzzing_seeds/id_000023,orig_353778e187277b7117906b5148f2c5664f4a09d9
 png-afl/fuzzing_seeds/id_000025,orig_36f641a2772720e205f208ee740ee8e7878417c2
 png-afl/fuzzing_seeds/id_000027,orig_3963b38d1bc68f1d89f879f8c9ecc0be29661db7
 png-afl/fuzzing_seeds/id_000028,orig_3c7923f135d358fd685065fde8a996d474367da2
 png-afl/fuzzing_seeds/id_000033,orig_434b22009b14d79d292bdba36e1c9d469ffd6621
 png-afl/fuzzing_seeds/id_000038,orig_4dd5a93acf101e99daea42f23555e2fd582fe400
 png-afl/fuzzing_seeds/id_000039,orig_4effda12c2611e2e4feb6f0d342feb685ccd825b
 png-afl/fuzzing_seeds/id_000042,orig_552f1c3c93d2fbd66322ac632d76da658451b8f2
 png-afl/fuzzing_seeds/id_000044,orig_5773467dc9fb2cb0d893c9f52ee82304a07c933b
 png-afl/fuzzing_seeds/id_000045,orig_58988106d03edadfd0589819cdbeee5ca4840bbc
 png-afl/fuzzing_seeds/id_000048,orig_5eed0a9941d51b4b81dd37b0ec47e0212f590d0c
 png-afl/fuzzing_seeds/id_000049,orig_643b0a9152e17b59016833e340ba82f9f3e50245
 png-afl/fuzzing_seeds/id_000050,orig_65bb64c0cff335e37189bc8fe3f1cb1fda85efdd
 png-afl/fuzzing_seeds/id_000051,orig_67a1be97015846c4ff4899530d7e20dc9cc82223
 png-afl/fuzzing_seeds/id_000053,orig_6f0adb505881dcbbcc9f9451511367c83a6095ac
 png-afl/fuzzing_seeds/id_000057,orig_730c9b15a39603ec2c470077ec955af0fda43c58
 png-afl/fuzzing_seeds/id_000060,orig_7ecfa97b030ba44e424055345da873bbc447b7b5
 png-afl/fuzzing_seeds/id_000061,orig_7f631f660ee2501b140164af3fa6b88693bbcd66
 png-afl/fuzzing_seeds/id_000062,orig_7faf6fe0bdb2d37f16f0ba3fa8d13c798a07e9d0
 png-afl/fuzzing_seeds/id_000066,orig_8d03e18f2c1873830a99c7e79dc1061aebf7c8df
 png-afl/fuzzing_seeds/id_000067,orig_8e6f4bd0a0ef7668a986a69fa9b2a5946190e66b
 png-afl/fuzzing_seeds/id_000077,orig_9f0c2985bd98c74fe766d18963ee91958ec9b9f2
 png-afl/fuzzing_seeds/id_000078,orig_a1c57f1cc3f92cd18c71ce5ad341cd8702faf51a
 png-afl/fuzzing_seeds/id_000080,orig_a87461573d6dd88155f59195324d2f84c26779c0
 png-afl/fuzzing_seeds/id_000081,orig_af2263242a69a92dd26c11b5237412efd3211258
 png-afl/fuzzing_seeds/id_000083,orig_b6bbfc493d038b97bba6cca4e6e8dff34e871159
 png-afl/fuzzing_seeds/id_000084,orig_bcac6abddfaab667e00dfd35efd54f938442c76a
 png-afl/fuzzing_seeds/id_000086,orig_c8e6bfba8dd71b9d84a201883c12500183adf895
 png-afl/fuzzing_seeds/id_000090,orig_d7e1291f1f2f25ea8e226b53273aa024dc62fc5a
 png-afl/fuzzing_seeds/id_000091,orig_d9b5b22f0332da6efd8ca9b9ee5e6f95d9631ef8
 png-afl/fuzzing_seeds/id_000092,orig_dac9e097f69b15e253d3de0b298e46915ab30a73
 png-afl/fuzzing_seeds/id_000150,src_000001,op_arith8,pos_75,val_-18,+cov
 png-afl/fuzzing_seeds/id_000151,src_000001,op_arith8,pos_75,val_-19,+cov
 png-afl/fuzzing_seeds/id_000152,sync_slave2,src_000143
 png-afl/fuzzing_seeds/id_000161,sync_slave2,src_000122,+cov
 png-afl/fuzzing_seeds/id_000162,src_000001,op_int16,pos_83,val_be_+512,+cov
 png-afl/fuzzing_seeds/id_000182,sync_slave2,src_000159
 png-afl/fuzzing_seeds/id_000184,sync_slave2,src_000184
 png-afl/fuzzing_seeds/id_000201,sync_slave2,src_000178,+cov
 png-afl/fuzzing_seeds/id_000223,sync_slave1,src_000198,+cov
 png-afl/fuzzing_seeds/id_000231,sync_slave1,src_000195
 png-afl/fuzzing_seeds/id_000235,src_000102+000101,op_splice,rep_2
 png-afl/fuzzing_seeds/id_000255,sync_slave1,src_000239
 png-afl/fuzzing_seeds/id_000258,sync_master,src_000128,+cov
 png-afl/fuzzing_seeds/id_000260,sync_slave1,src_000245,+cov
 png-afl/fuzzing_seeds/id_000261,sync_slave2,src_000256,+cov
 png-afl/fuzzing_seeds/id_000263,sync_slave1,src_000253,+cov
 png-afl/fuzzing_seeds/id_000270,src_000127+000120,op_splice,rep_4,+cov
 png-afl/fuzzing_seeds/id_000272,src_000130+000233,op_splice,rep_8
 png-afl/fuzzing_seeds/id_000273,src_000132+000173,op_splice,rep_4,+cov
 png-afl/fuzzing_seeds/id_000283,sync_slave1,src_000237
 png-afl/fuzzing_seeds/id_000290,src_000149,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000303,src_000163,op_havoc,rep_2,+cov
 png-afl/fuzzing_seeds/id_000305,src_000163,op_havoc,rep_4,+cov
 png-afl/fuzzing_seeds/id_000307,sync_slave1,src_000192
 png-afl/fuzzing_seeds/id_000308,src_000163,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_000310,src_000169,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000313,sync_slave1,src_000306
 png-afl/fuzzing_seeds/id_000315,sync_slave1,src_000240
 png-afl/fuzzing_seeds/id_000331,sync_slave1,src_000314,+cov
 png-afl/fuzzing_seeds/id_000333,sync_slave1,src_000325,+cov
 png-afl/fuzzing_seeds/id_000341,src_000195+000251,op_splice,rep_4
 png-afl/fuzzing_seeds/id_000351,sync_master,src_000319
 png-afl/fuzzing_seeds/id_000353,src_000251,op_havoc,rep_2,+cov
 png-afl/fuzzing_seeds/id_000356,sync_slave2,src_000355
 png-afl/fuzzing_seeds/id_000357,sync_slave2,src_000350
 png-afl/fuzzing_seeds/id_000358,sync_slave1,src_000342,+cov
 png-afl/fuzzing_seeds/id_000366,sync_slave1,src_000339
 png-afl/fuzzing_seeds/id_000368,sync_slave1,src_000362
 png-afl/fuzzing_seeds/id_000371,sync_slave1,src_000361
 png-afl/fuzzing_seeds/id_000375,sync_slave1,src_000363,+cov
 png-afl/fuzzing_seeds/id_000378,src_000276+000179,op_splice,rep_4
 png-afl/fuzzing_seeds/id_000385,sync_slave1,src_000368
 png-afl/fuzzing_seeds/id_000387,src_000303+000183,op_splice,rep_2,+cov
 png-afl/fuzzing_seeds/id_000391,sync_slave1,src_000380
 png-afl/fuzzing_seeds/id_000392,sync_master,src_000321
 png-afl/fuzzing_seeds/id_000393,src_000328,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000401,sync_slave1,src_000396
 png-afl/fuzzing_seeds/id_000403,sync_slave1,src_000391
 png-afl/fuzzing_seeds/id_000405,sync_slave1,src_000395
 png-afl/fuzzing_seeds/id_000410,sync_slave1,src_000398
 png-afl/fuzzing_seeds/id_000415,sync_slave1,src_000404
 png-afl/fuzzing_seeds/id_000417,src_000404+000402,op_splice,rep_2
 png-afl/fuzzing_seeds/id_000418,src_000407,op_havoc,rep_4,+cov
 png-afl/fuzzing_seeds/id_000444,sync_slave1,src_000430
 png-afl/fuzzing_seeds/id_000462,src_000428,op_havoc,rep_8
 png-afl/fuzzing_seeds/id_000473,sync_slave1,src_000447,+cov
 png-afl/fuzzing_seeds/id_000474,sync_slave1,src_000449,+cov
 png-afl/fuzzing_seeds/id_000475,sync_slave1,src_000440
 png-afl/fuzzing_seeds/id_000478,sync_slave1,src_000465
 png-afl/fuzzing_seeds/id_000489,sync_slave1,src_000466
 png-afl/fuzzing_seeds/id_000491,src_000460,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_000512,src_000496,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000515,sync_slave2,src_000501
 png-afl/fuzzing_seeds/id_000517,sync_slave2,src_000504
 png-afl/fuzzing_seeds/id_000520,sync_slave1,src_000507
 png-afl/fuzzing_seeds/id_000528,src_000504+000379,op_splice,rep_4
 png-afl/fuzzing_seeds/id_000534,sync_slave1,src_000524
 png-afl/fuzzing_seeds/id_000536,sync_slave1,src_000530,+cov
 png-afl/fuzzing_seeds/id_000538,sync_slave2,src_000537
 png-afl/fuzzing_seeds/id_000539,sync_slave2,src_000530
 png-afl/fuzzing_seeds/id_000540,src_000530,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000540,sync_slave2,src_000538
 png-afl/fuzzing_seeds/id_000541,src_000530,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_000542,src_000530,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000544,src_000530,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_000544,src_000541,op_havoc,rep_8
 png-afl/fuzzing_seeds/id_000548,src_000541,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_000555,sync_slave1,src_000533
 png-afl/fuzzing_seeds/id_000555,sync_slave2,src_000545
 png-afl/fuzzing_seeds/id_000556,sync_slave1,src_000532
 png-afl/fuzzing_seeds/id_000558,sync_slave1,src_000551
 png-afl/fuzzing_seeds/id_000559,sync_slave1,src_000531
 png-afl/fuzzing_seeds/id_000560,sync_slave1,src_000543
 png-afl/fuzzing_seeds/id_000562,sync_slave1,src_000557
 png-afl/fuzzing_seeds/id_000573,sync_slave1,src_000568
 png-afl/fuzzing_seeds/id_000575,sync_slave1,src_000570
 png-afl/fuzzing_seeds/id_000576,src_000166+000370,op_splice,rep_2
 png-afl/fuzzing_seeds/id_000577,sync_slave1,src_000571
 png-afl/fuzzing_seeds/id_000578,src_000276+000411,op_splice,rep_4
 png-afl/fuzzing_seeds/id_000579,src_000276+000411,op_splice,rep_2
 png-afl/fuzzing_seeds/id_000581,sync_slave1,src_000572,+cov
 png-afl/fuzzing_seeds/id_000585,src_000049+000256,op_splice,rep_4
 png-afl/fuzzing_seeds/id_000587,src_000580,op_havoc,rep_2,+cov
 png-afl/fuzzing_seeds/id_000587,sync_slave1,src_000582
 png-afl/fuzzing_seeds/id_000588,src_000587,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000589,sync_slave2,src_000589
 png-afl/fuzzing_seeds/id_000590,src_000587,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000591,src_000587,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000591,src_000589,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_000592,src_000589,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000592,src_000589,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_000595,src_000589+000519,op_splice,rep_4
 png-afl/fuzzing_seeds/id_000597,src_000594+000577,op_splice,rep_4
 png-afl/fuzzing_seeds/id_000598,sync_slave1,src_000590
 png-afl/fuzzing_seeds/id_000599,sync_slave1,src_000585
 png-afl/fuzzing_seeds/id_000600,sync_slave1,src_000583
 png-afl/fuzzing_seeds/id_000602,src_000598,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000614,src_000612+000335,op_splice,rep_2
 png-afl/fuzzing_seeds/id_000615,src_000613,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000618,src_000617+000437,op_splice,rep_2,+cov
 png-afl/fuzzing_seeds/id_000622,src_000275+000521,op_splice,rep_4
 png-afl/fuzzing_seeds/id_000623,src_000276,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000628,src_000169+000605,op_splice,rep_2
 png-afl/fuzzing_seeds/id_000631,sync_slave1,src_000625
 png-afl/fuzzing_seeds/id_000641,src_000573,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000642,src_000573+000396,op_splice,rep_4
 png-afl/fuzzing_seeds/id_000645,src_000641+000238,op_splice,rep_4
 png-afl/fuzzing_seeds/id_000647,sync_slave1,src_000635
 png-afl/fuzzing_seeds/id_000650,sync_slave1,src_000646
 png-afl/fuzzing_seeds/id_000653,sync_slave1,src_000645
 png-afl/fuzzing_seeds/id_000654,src_000643,op_havoc,rep_16,+cov
 png-afl/fuzzing_seeds/id_000656,src_000643,op_havoc,rep_16
 png-afl/fuzzing_seeds/id_000670,src_000649+000303,op_splice,rep_2
 png-afl/fuzzing_seeds/id_000674,sync_slave2,src_000661
 png-afl/fuzzing_seeds/id_000676,sync_slave2,src_000664
 png-afl/fuzzing_seeds/id_000678,sync_slave2,src_000658
 png-afl/fuzzing_seeds/id_000679,sync_slave2,src_000657
 png-afl/fuzzing_seeds/id_000680,sync_slave2,src_000656
 png-afl/fuzzing_seeds/id_000682,sync_slave2,src_000655
 png-afl/fuzzing_seeds/id_000683,sync_slave2,src_000654
 png-afl/fuzzing_seeds/id_000687,src_000665,op_havoc,rep_8
 png-afl/fuzzing_seeds/id_000689,src_000657,op_havoc,rep_64
 png-afl/fuzzing_seeds/id_000692,src_000665,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000704,src_000669+000328,op_splice,rep_4
 png-afl/fuzzing_seeds/id_000708,sync_slave1,src_000684,+cov
 png-afl/fuzzing_seeds/id_000711,sync_slave1,src_000697
 png-afl/fuzzing_seeds/id_000721,sync_slave2,src_000693
 png-afl/fuzzing_seeds/id_000725,sync_slave1,src_000667
 png-afl/fuzzing_seeds/id_000728,sync_slave1,src_000663
 png-afl/fuzzing_seeds/id_000738,sync_master,src_000568
 png-afl/fuzzing_seeds/id_000740,sync_slave2,src_000684
 png-afl/fuzzing_seeds/id_000741,sync_slave2,src_000698
 png-afl/fuzzing_seeds/id_000742,sync_slave2,src_000678,+cov
 png-afl/fuzzing_seeds/id_000743,src_000675+000357,op_splice,rep_8
 png-afl/fuzzing_seeds/id_000751,src_000678,op_havoc,rep_64
 png-afl/fuzzing_seeds/id_000755,src_000690,op_havoc,rep_8
 png-afl/fuzzing_seeds/id_000761,src_000679+000313,op_splice,rep_4
 png-afl/fuzzing_seeds/id_000766,src_000685+000406,op_splice,rep_2
 png-afl/fuzzing_seeds/id_000768,sync_slave1,src_000754
 png-afl/fuzzing_seeds/id_000770,sync_slave1,src_000762
 png-afl/fuzzing_seeds/id_000772,sync_slave1,src_000767
 png-afl/fuzzing_seeds/id_000775,sync_slave1,src_000714
 png-afl/fuzzing_seeds/id_000777,sync_slave1,src_000749
 png-afl/fuzzing_seeds/id_000781,src_000709,op_havoc,rep_8
 png-afl/fuzzing_seeds/id_000781,sync_slave1,src_000719
 png-afl/fuzzing_seeds/id_000785,sync_master,src_000679
 png-afl/fuzzing_seeds/id_000785,sync_slave1,src_000716
 png-afl/fuzzing_seeds/id_000786,sync_master,src_000686
 png-afl/fuzzing_seeds/id_000787,sync_master,src_000676
 png-afl/fuzzing_seeds/id_000788,sync_slave1,src_000766
 png-afl/fuzzing_seeds/id_000789,sync_master,src_000682
 png-afl/fuzzing_seeds/id_000790,sync_slave1,src_000718
 png-afl/fuzzing_seeds/id_000791,sync_master,src_000683
 png-afl/fuzzing_seeds/id_000792,sync_master,src_000680
 png-afl/fuzzing_seeds/id_000793,sync_slave1,src_000753
 png-afl/fuzzing_seeds/id_000794,sync_master,src_000684
 png-afl/fuzzing_seeds/id_000794,sync_slave1,src_000752
 png-afl/fuzzing_seeds/id_000797,sync_slave2,src_000763
 png-afl/fuzzing_seeds/id_000801,sync_slave2,src_000797
 png-afl/fuzzing_seeds/id_000802,sync_slave2,src_000800
 png-afl/fuzzing_seeds/id_000803,sync_slave2,src_000762
 png-afl/fuzzing_seeds/id_000804,sync_slave2,src_000759
 png-afl/fuzzing_seeds/id_000805,sync_slave2,src_000760
 png-afl/fuzzing_seeds/id_000815,sync_slave1,src_000768,+cov
 png-afl/fuzzing_seeds/id_000816,sync_slave1,src_000782
 png-afl/fuzzing_seeds/id_000823,src_000734,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000825,src_000734,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000827,src_000734+000392,op_splice,rep_2
 png-afl/fuzzing_seeds/id_000828,sync_slave2,src_000820
 png-afl/fuzzing_seeds/id_000829,sync_slave2,src_000823
 png-afl/fuzzing_seeds/id_000830,sync_slave2,src_000825
 png-afl/fuzzing_seeds/id_000833,sync_slave2,src_000809
 png-afl/fuzzing_seeds/id_000834,sync_slave2,src_000824
 png-afl/fuzzing_seeds/id_000835,sync_slave1,src_000822
 png-afl/fuzzing_seeds/id_000836,src_000741+000685,op_splice,rep_2
 png-afl/fuzzing_seeds/id_000838,sync_slave1,src_000819
 png-afl/fuzzing_seeds/id_000840,src_000757,op_havoc,rep_16
 png-afl/fuzzing_seeds/id_000840,sync_slave1,src_000821
 png-afl/fuzzing_seeds/id_000841,src_000757,op_havoc,rep_16
 png-afl/fuzzing_seeds/id_000841,sync_slave1,src_000813
 png-afl/fuzzing_seeds/id_000842,src_000757,op_havoc,rep_8
 png-afl/fuzzing_seeds/id_000842,sync_slave1,src_000815
 png-afl/fuzzing_seeds/id_000843,sync_slave1,src_000817
 png-afl/fuzzing_seeds/id_000848,src_000764,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_000853,sync_slave2,src_000830
 png-afl/fuzzing_seeds/id_000854,sync_slave2,src_000846
 png-afl/fuzzing_seeds/id_000863,sync_slave1,src_000858
 png-afl/fuzzing_seeds/id_000864,sync_slave1,src_000855
 png-afl/fuzzing_seeds/id_000866,sync_slave2,src_000854
 png-afl/fuzzing_seeds/id_000867,sync_slave2,src_000856
 png-afl/fuzzing_seeds/id_000869,sync_slave2,src_000866
 png-afl/fuzzing_seeds/id_000873,src_000826,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000874,sync_slave1,src_000864
 png-afl/fuzzing_seeds/id_000875,sync_slave1,src_000865
 png-afl/fuzzing_seeds/id_000877,sync_slave1,src_000876
 png-afl/fuzzing_seeds/id_000878,src_000844,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_000879,src_000844+000286,op_splice,rep_4
 png-afl/fuzzing_seeds/id_000880,sync_slave1,src_000871
 png-afl/fuzzing_seeds/id_000882,sync_slave2,src_000868
 png-afl/fuzzing_seeds/id_000883,sync_slave2,src_000882
 png-afl/fuzzing_seeds/id_000884,sync_slave2,src_000873
 png-afl/fuzzing_seeds/id_000887,src_000859,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_000890,sync_slave2,src_000887
 png-afl/fuzzing_seeds/id_000891,sync_slave2,src_000884
 png-afl/fuzzing_seeds/id_000892,sync_slave2,src_000883
 png-afl/fuzzing_seeds/id_000893,sync_slave1,src_000880
 png-afl/fuzzing_seeds/id_000893,sync_slave2,src_000886
 png-afl/fuzzing_seeds/id_000896,sync_slave1,src_000889
 png-afl/fuzzing_seeds/id_000898,sync_slave1,src_000885
 png-afl/fuzzing_seeds/id_000899,src_000884+000437,op_splice,rep_2
 png-afl/fuzzing_seeds/id_000900,src_000884+000437,op_splice,rep_2
 png-afl/fuzzing_seeds/id_000900,sync_slave1,src_000896
 png-afl/fuzzing_seeds/id_000901,src_000886+000634,op_splice,rep_2
 png-afl/fuzzing_seeds/id_000901,sync_slave1,src_000888
 png-afl/fuzzing_seeds/id_000902,sync_slave1,src_000886
 png-afl/fuzzing_seeds/id_000903,sync_slave1,src_000897
 png-afl/fuzzing_seeds/id_000904,sync_slave1,src_000898
 png-afl/fuzzing_seeds/id_000908,src_000892,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000909,src_000883,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000910,src_000883,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_000910,sync_master,src_000805
 png-afl/fuzzing_seeds/id_000911,sync_master,src_000806
 png-afl/fuzzing_seeds/id_000912,sync_master,src_000804
 png-afl/fuzzing_seeds/id_000913,sync_master,src_000803
 png-afl/fuzzing_seeds/id_000921,sync_slave1,src_000915
 png-afl/fuzzing_seeds/id_000922,src_000903+000394,op_splice,rep_8
 png-afl/fuzzing_seeds/id_000927,sync_slave1,src_000914
 png-afl/fuzzing_seeds/id_000929,sync_slave2,src_000913
 png-afl/fuzzing_seeds/id_000930,sync_slave2,src_000911
 png-afl/fuzzing_seeds/id_000932,sync_slave2,src_000928
 png-afl/fuzzing_seeds/id_000933,sync_slave2,src_000912
 png-afl/fuzzing_seeds/id_000937,sync_slave1,src_000937
 png-afl/fuzzing_seeds/id_000938,sync_slave1,src_000938
 png-afl/fuzzing_seeds/id_000939,sync_slave1,src_000936
 png-afl/fuzzing_seeds/id_000940,sync_slave1,src_000940
 png-afl/fuzzing_seeds/id_000941,src_000933,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_000942,sync_slave1,src_000928
 png-afl/fuzzing_seeds/id_000943,sync_slave2,src_000932
 png-afl/fuzzing_seeds/id_000944,sync_slave2,src_000930
 png-afl/fuzzing_seeds/id_000946,src_000717+000621,op_splice,rep_2
 png-afl/fuzzing_seeds/id_000947,src_000717+000666,op_splice,rep_64
 png-afl/fuzzing_seeds/id_000949,src_000823+000612,op_splice,rep_32
 png-afl/fuzzing_seeds/id_000950,sync_slave1,src_000950
 png-afl/fuzzing_seeds/id_000951,sync_slave2,src_000947
 png-afl/fuzzing_seeds/id_000952,sync_slave2,src_000948
 png-afl/fuzzing_seeds/id_000959,sync_slave2,src_000955
 png-afl/fuzzing_seeds/id_000962,sync_slave2,src_000958
 png-afl/fuzzing_seeds/id_000963,sync_slave2,src_000960
 png-afl/fuzzing_seeds/id_000964,sync_slave2,src_000959
 png-afl/fuzzing_seeds/id_000965,sync_slave2,src_000961
 png-afl/fuzzing_seeds/id_000972,src_000744+000071,op_splice,rep_2
 png-afl/fuzzing_seeds/id_000974,src_000122+000812,op_splice,rep_2
 png-afl/fuzzing_seeds/id_000976,src_000335+000572,op_splice,rep_2
 png-afl/fuzzing_seeds/id_000979,sync_slave2,src_000976
 png-afl/fuzzing_seeds/id_000980,src_000405+000752,op_splice,rep_16
 png-afl/fuzzing_seeds/id_000981,sync_master,src_000872
 png-afl/fuzzing_seeds/id_000982,src_000707+000635,op_splice,rep_4
 png-afl/fuzzing_seeds/id_000983,sync_master,src_000873
 png-afl/fuzzing_seeds/id_000986,sync_master,src_000875
 png-afl/fuzzing_seeds/id_000990,src_000937,op_arith8,pos_83,val_-33
 png-afl/fuzzing_seeds/id_000992,sync_master,src_000877
 png-afl/fuzzing_seeds/id_001015,src_001007+000010,op_splice,rep_4
 png-afl/fuzzing_seeds/id_001023,src_001016,op_havoc,rep_32,+cov
 png-afl/fuzzing_seeds/id_001032,src_001025,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_001047,src_000934,op_havoc,rep_8
 png-afl/fuzzing_seeds/id_001053,sync_master,src_000927
 png-afl/fuzzing_seeds/id_001054,sync_slave2,src_001053
 png-afl/fuzzing_seeds/id_001057,sync_slave2,src_001056
 png-afl/fuzzing_seeds/id_001058,sync_slave2,src_001058
 png-afl/fuzzing_seeds/id_001059,sync_slave2,src_001057
 png-afl/fuzzing_seeds/id_001060,sync_slave2,src_001060,+cov
 png-afl/fuzzing_seeds/id_001061,sync_slave2,src_001059
 png-afl/fuzzing_seeds/id_001062,src_001058+001012,op_splice,rep_4
 png-afl/fuzzing_seeds/id_001063,sync_slave1,src_001063
 png-afl/fuzzing_seeds/id_001066,sync_master,src_000944
 png-afl/fuzzing_seeds/id_001068,sync_slave2,src_001068
 png-afl/fuzzing_seeds/id_001069,sync_slave2,src_001067
 png-afl/fuzzing_seeds/id_001070,src_001031,op_havoc,rep_32
 png-afl/fuzzing_seeds/id_001071,sync_slave2,src_001070
 png-afl/fuzzing_seeds/id_001072,sync_master,src_000952
 png-afl/fuzzing_seeds/id_001073,src_000874,op_havoc,rep_8
 png-afl/fuzzing_seeds/id_001074,sync_slave2,src_001073
 png-afl/fuzzing_seeds/id_001077,sync_slave2,src_001076
 png-afl/fuzzing_seeds/id_001078,sync_master,src_000957
 png-afl/fuzzing_seeds/id_001079,sync_master,src_000959
 png-afl/fuzzing_seeds/id_001080,sync_master,src_000960
 png-afl/fuzzing_seeds/id_001082,sync_master,src_000961
 png-afl/fuzzing_seeds/id_001083,sync_master,src_000962
 png-afl/fuzzing_seeds/id_001087,sync_slave2,src_001086
 png-afl/fuzzing_seeds/id_001088,src_000696+000957,op_splice,rep_2
 png-afl/fuzzing_seeds/id_001091,sync_slave1,src_001090
 png-afl/fuzzing_seeds/id_001093,src_000094+001072,op_splice,rep_32
 png-afl/fuzzing_seeds/id_001094,sync_slave2,src_001093
 png-afl/fuzzing_seeds/id_001095,sync_slave2,src_001094
 png-afl/fuzzing_seeds/id_001096,sync_slave2,src_001095
 png-afl/fuzzing_seeds/id_001097,sync_slave2,src_001096
 png-afl/fuzzing_seeds/id_001099,sync_master,src_000974
 png-afl/fuzzing_seeds/id_001101,sync_master,src_000981
 png-afl/fuzzing_seeds/id_001102,sync_master,src_000980
 png-afl/fuzzing_seeds/id_001105,sync_master,src_000985
 png-afl/fuzzing_seeds/id_001110,sync_slave2,src_001109
 png-afl/fuzzing_seeds/id_001114,sync_slave2,src_001113
 png-afl/fuzzing_seeds/id_001115,sync_slave1,src_001115
 png-afl/fuzzing_seeds/id_001117,sync_slave1,src_001117
 png-afl/fuzzing_seeds/id_001120,sync_slave1,src_001119
 png-afl/fuzzing_seeds/id_001120,sync_slave2,src_001118
 png-afl/fuzzing_seeds/id_001122,sync_slave2,src_001121
 png-afl/fuzzing_seeds/id_001124,sync_master,src_001003
 png-afl/fuzzing_seeds/id_001127,sync_slave1,src_001127
 png-afl/fuzzing_seeds/id_001130,src_000227+001038,op_splice,rep_4
 png-afl/fuzzing_seeds/id_001131,sync_master,src_001006
 png-afl/fuzzing_seeds/id_001133,sync_master,src_001012
 png-afl/fuzzing_seeds/id_001138,sync_slave1,src_001138
 png-afl/fuzzing_seeds/id_001142,sync_master,src_001020
 png-afl/fuzzing_seeds/id_001143,sync_master,src_001021,+cov
 png-afl/fuzzing_seeds/id_001146,sync_master,src_001023
 png-afl/fuzzing_seeds/id_001148,sync_slave2,src_001146
 png-afl/fuzzing_seeds/id_001150,src_000746+001141,op_splice,rep_2
 png-afl/fuzzing_seeds/id_001157,sync_slave2,src_001156
 png-afl/fuzzing_seeds/id_001158,src_000349+001121,op_splice,rep_4
 png-afl/fuzzing_seeds/id_001159,src_000390+001130,op_splice,rep_2
 png-afl/fuzzing_seeds/id_001160,src_001014,op_havoc,rep_32
 png-afl/fuzzing_seeds/id_001163,sync_slave2,src_001162
 png-afl/fuzzing_seeds/id_001169,src_001168,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001171,sync_slave2,src_001169
 png-afl/fuzzing_seeds/id_001176,sync_master,src_001053
 png-afl/fuzzing_seeds/id_001177,src_001090,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001178,sync_slave1,src_001178
 png-afl/fuzzing_seeds/id_001179,src_001142,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_001180,sync_slave2,src_001179
 png-afl/fuzzing_seeds/id_001181,sync_slave2,src_001181
 png-afl/fuzzing_seeds/id_001184,sync_slave2,src_001182
 png-afl/fuzzing_seeds/id_001187,sync_slave1,src_001186
 png-afl/fuzzing_seeds/id_001188,sync_slave2,src_001185
 png-afl/fuzzing_seeds/id_001189,sync_master,src_001058
 png-afl/fuzzing_seeds/id_001190,src_001165,op_havoc,rep_8
 png-afl/fuzzing_seeds/id_001190,sync_master,src_001059
 png-afl/fuzzing_seeds/id_001193,src_001192,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001194,src_001192,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001194,sync_slave1,src_001193
 png-afl/fuzzing_seeds/id_001197,sync_slave1,src_001195
 png-afl/fuzzing_seeds/id_001204,sync_slave1,src_001202
 png-afl/fuzzing_seeds/id_001205,sync_slave1,src_001203
 png-afl/fuzzing_seeds/id_001206,src_001197,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001207,sync_slave1,src_001205
 png-afl/fuzzing_seeds/id_001211,sync_slave1,src_001210
 png-afl/fuzzing_seeds/id_001212,sync_slave1,src_001209
 png-afl/fuzzing_seeds/id_001213,sync_slave2,src_001213
 png-afl/fuzzing_seeds/id_001214,sync_slave2,src_001214
 png-afl/fuzzing_seeds/id_001219,sync_slave2,src_001218
 png-afl/fuzzing_seeds/id_001221,sync_slave1,src_001201
 png-afl/fuzzing_seeds/id_001222,sync_slave1,src_001211
 png-afl/fuzzing_seeds/id_001223,src_001216,op_havoc,rep_8
 png-afl/fuzzing_seeds/id_001223,sync_slave1,src_001208
 png-afl/fuzzing_seeds/id_001227,sync_slave1,src_001227
 png-afl/fuzzing_seeds/id_001230,src_001223,op_havoc,rep_2,+cov
 png-afl/fuzzing_seeds/id_001234,sync_slave1,src_001228
 png-afl/fuzzing_seeds/id_001235,src_001224+001042,op_splice,rep_16
 png-afl/fuzzing_seeds/id_001236,src_001226,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001237,src_001229+000936,op_splice,rep_8,+cov
 png-afl/fuzzing_seeds/id_001241,sync_slave2,src_001238,+cov
 png-afl/fuzzing_seeds/id_001242,sync_slave1,src_001239
 png-afl/fuzzing_seeds/id_001244,src_001238,op_havoc,rep_4,+cov
 png-afl/fuzzing_seeds/id_001245,sync_slave1,src_001244
 png-afl/fuzzing_seeds/id_001246,sync_slave1,src_001245
 png-afl/fuzzing_seeds/id_001249,sync_slave1,src_001246
 png-afl/fuzzing_seeds/id_001254,src_001247,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001262,src_001247,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001262,sync_slave2,src_001257
 png-afl/fuzzing_seeds/id_001268,src_001258,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_001269,sync_slave2,src_001258
 png-afl/fuzzing_seeds/id_001270,src_001258,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_001270,sync_slave2,src_001269
 png-afl/fuzzing_seeds/id_001271,src_001258,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001272,src_001265,op_havoc,rep_4,+cov
 png-afl/fuzzing_seeds/id_001273,src_001258+000778,op_splice,rep_128
 png-afl/fuzzing_seeds/id_001276,src_001272,op_havoc,rep_2,+cov
 png-afl/fuzzing_seeds/id_001277,src_001272,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001278,src_001274,op_havoc,rep_8
 png-afl/fuzzing_seeds/id_001284,src_000312+001247,op_splice,rep_16
 png-afl/fuzzing_seeds/id_001285,sync_slave1,src_001282
 png-afl/fuzzing_seeds/id_001286,sync_slave1,src_001281
 png-afl/fuzzing_seeds/id_001290,src_001282,op_havoc,rep_32,+cov
 png-afl/fuzzing_seeds/id_001291,src_001179+001231,op_splice,rep_4
 png-afl/fuzzing_seeds/id_001292,src_001252,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001297,src_001266+001055,op_splice,rep_16
 png-afl/fuzzing_seeds/id_001298,src_001276,op_havoc,rep_8
 png-afl/fuzzing_seeds/id_001299,src_001298,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001300,src_001299,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001301,sync_slave1,src_001297,+cov
 png-afl/fuzzing_seeds/id_001302,src_001301+001145,op_splice,rep_2,+cov
 png-afl/fuzzing_seeds/id_001303,sync_slave1,src_001299
 png-afl/fuzzing_seeds/id_001305,sync_slave1,src_001301
 png-afl/fuzzing_seeds/id_001308,src_000156+001304,op_splice,rep_16
 png-afl/fuzzing_seeds/id_001310,src_000951+001051,op_splice,rep_32
 png-afl/fuzzing_seeds/id_001311,src_001111,op_havoc,rep_16
 png-afl/fuzzing_seeds/id_001313,sync_slave1,src_001310
 png-afl/fuzzing_seeds/id_001314,sync_slave1,src_001309
 png-afl/fuzzing_seeds/id_001319,sync_slave1,src_001312
 png-afl/fuzzing_seeds/id_001323,sync_slave1,src_001320
 png-afl/fuzzing_seeds/id_001331,src_000370+001160,op_splice,rep_16
 png-afl/fuzzing_seeds/id_001332,sync_slave1,src_001328
 png-afl/fuzzing_seeds/id_001336,src_001255+000967,op_splice,rep_2,+cov
 png-afl/fuzzing_seeds/id_001342,sync_slave1,src_001337
 png-afl/fuzzing_seeds/id_001350,sync_slave1,src_001345
 png-afl/fuzzing_seeds/id_001351,src_001347,op_havoc,rep_16
 png-afl/fuzzing_seeds/id_001353,sync_slave1,src_001348
 png-afl/fuzzing_seeds/id_001354,sync_slave1,src_001351
 png-afl/fuzzing_seeds/id_001355,sync_slave1,src_001353
 png-afl/fuzzing_seeds/id_001357,sync_slave1,src_001352
 png-afl/fuzzing_seeds/id_001360,src_001351+001198,op_splice,rep_4
 png-afl/fuzzing_seeds/id_001363,src_001352,op_havoc,rep_32
 png-afl/fuzzing_seeds/id_001367,sync_slave2,src_001367
 png-afl/fuzzing_seeds/id_001368,src_001352,op_havoc,rep_64
 png-afl/fuzzing_seeds/id_001370,src_001352,op_havoc,rep_128
 png-afl/fuzzing_seeds/id_001371,src_001352,op_havoc,rep_64
 png-afl/fuzzing_seeds/id_001372,src_001352,op_havoc,rep_16
 png-afl/fuzzing_seeds/id_001373,src_001352,op_havoc,rep_128
 png-afl/fuzzing_seeds/id_001374,src_001352,op_havoc,rep_8
 png-afl/fuzzing_seeds/id_001376,src_001352,op_havoc,rep_32
 png-afl/fuzzing_seeds/id_001377,src_001352,op_havoc,rep_32
 png-afl/fuzzing_seeds/id_001378,sync_slave2,src_001378
 png-afl/fuzzing_seeds/id_001379,src_001352,op_havoc,rep_16
 png-afl/fuzzing_seeds/id_001380,src_001352,op_havoc,rep_64
 png-afl/fuzzing_seeds/id_001381,sync_slave2,src_001381
 png-afl/fuzzing_seeds/id_001382,sync_slave1,src_001380
 png-afl/fuzzing_seeds/id_001385,src_001368,op_havoc,rep_16
 png-afl/fuzzing_seeds/id_001386,sync_slave1,src_001383
 png-afl/fuzzing_seeds/id_001387,sync_slave1,src_001384
 png-afl/fuzzing_seeds/id_001388,src_000370+001144,op_splice,rep_2
 png-afl/fuzzing_seeds/id_001392,sync_slave1,src_001389
 png-afl/fuzzing_seeds/id_001394,src_000484,op_havoc,rep_8
 png-afl/fuzzing_seeds/id_001395,sync_slave1,src_001392
 png-afl/fuzzing_seeds/id_001397,src_001394,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_001399,src_001391,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_001400,sync_slave1,src_001397
 png-afl/fuzzing_seeds/id_001405,sync_slave1,src_001402
 png-afl/fuzzing_seeds/id_001406,sync_slave1,src_001403
 png-afl/fuzzing_seeds/id_001408,src_001399,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_001409,src_001400,op_havoc,rep_8
 png-afl/fuzzing_seeds/id_001411,sync_slave1,src_001408
 png-afl/fuzzing_seeds/id_001414,src_001395,op_havoc,rep_64
 png-afl/fuzzing_seeds/id_001418,sync_slave1,src_001415,+cov
 png-afl/fuzzing_seeds/id_001420,src_001104+000085,op_splice,rep_8
 png-afl/fuzzing_seeds/id_001423,src_001412,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001424,src_001412,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001427,sync_slave1,src_001424
 png-afl/fuzzing_seeds/id_001431,src_001430,op_havoc,rep_8,+cov
 png-afl/fuzzing_seeds/id_001436,sync_slave1,src_001433
 png-afl/fuzzing_seeds/id_001442,src_001435,op_havoc,rep_4,+cov
 png-afl/fuzzing_seeds/id_001461,sync_slave2,src_001458
 png-afl/fuzzing_seeds/id_001462,src_001437,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001466,sync_slave2,src_001465
 png-afl/fuzzing_seeds/id_001472,sync_slave2,src_001471
 png-afl/fuzzing_seeds/id_001473,src_001322,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_001474,sync_slave2,src_001473
 png-afl/fuzzing_seeds/id_001476,src_001466,op_havoc,rep_8
 png-afl/fuzzing_seeds/id_001478,src_001474,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001480,sync_slave2,src_001476
 png-afl/fuzzing_seeds/id_001482,sync_slave2,src_001479
 png-afl/fuzzing_seeds/id_001484,sync_slave2,src_001481
 png-afl/fuzzing_seeds/id_001485,src_001483,op_havoc,rep_16
 png-afl/fuzzing_seeds/id_001490,sync_slave2,src_001488
 png-afl/fuzzing_seeds/id_001493,src_000093+001077,op_splice,rep_2
 png-afl/fuzzing_seeds/id_001499,src_001297+001456,op_splice,rep_2
 png-afl/fuzzing_seeds/id_001501,src_001499,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001502,sync_slave2,src_001500
 png-afl/fuzzing_seeds/id_001506,src_001495,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_001507,src_001501,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001511,sync_slave2,src_001509
 png-afl/fuzzing_seeds/id_001514,sync_slave2,src_001512
 png-afl/fuzzing_seeds/id_001515,src_001091+001502,op_splice,rep_4
 png-afl/fuzzing_seeds/id_001516,src_001312+000781,op_splice,rep_32
 png-afl/fuzzing_seeds/id_001525,src_001524,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_001527,sync_slave2,src_001525
 png-afl/fuzzing_seeds/id_001530,sync_slave2,src_001527
 png-afl/fuzzing_seeds/id_001531,sync_slave2,src_001529
 png-afl/fuzzing_seeds/id_001533,sync_slave2,src_001531
 png-afl/fuzzing_seeds/id_001534,sync_slave2,src_001532
 png-afl/fuzzing_seeds/id_001535,src_001493,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001536,sync_slave2,src_001533
 png-afl/fuzzing_seeds/id_001539,sync_slave2,src_001537
 png-afl/fuzzing_seeds/id_001540,src_001536,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001542,src_000567+001540,op_splice,rep_2
 png-afl/fuzzing_seeds/id_001544,src_001346,op_havoc,rep_16
 png-afl/fuzzing_seeds/id_001546,sync_slave2,src_001544
 png-afl/fuzzing_seeds/id_001547,src_001365,op_havoc,rep_64
 png-afl/fuzzing_seeds/id_001548,src_001346+001460,op_splice,rep_16
 png-afl/fuzzing_seeds/id_001550,sync_slave2,src_001548
 png-afl/fuzzing_seeds/id_001551,src_001345+001497,op_splice,rep_8
 png-afl/fuzzing_seeds/id_001552,src_001088+001503,op_splice,rep_16
 png-afl/fuzzing_seeds/id_001557,src_001114,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_001558,sync_slave2,src_001556
 png-afl/fuzzing_seeds/id_001559,src_001555,op_havoc,rep_2
 png-afl/fuzzing_seeds/id_001560,src_001557,op_havoc,rep_4
 png-afl/fuzzing_seeds/id_001562,src_001561,op_havoc,rep_4

There's a crc32 implementation in src/crc.rs

A duplicate also lives in tests/check_testimages.rs

This issue is for reusing the code from src/crc.rs and deleting the duplicated code in tests/check_testimages.rs

I see you also have encoder functionality. The piston crate in fact gives its to its users, so I assume its mature?

Would it be possible to update the github description of the repo and the description in Cargo.toml to reflect that?

I'm coming from a discussion in IRC where someone erroneously assumed (probably due to this misinformation) that this crate can only decode.

Thanks!

For my workflow (Gstreamer encoding 50 fps in 4k using https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/tree/main/video/png) I needed a bit of performance. This more or less solved my speed issues.

During QA testing this issue came up. I have a full example which reproduces it here: https://github.com/Follpvosten/png-parse-regression Basically, the standard example from the docs used to decode this PNG fine. In 0.17, it doesn't work anymore. The example I wrote has two tests which confirm that.

I have other example files which fail to parse if that's useful, and if I can do anything else to help with this issue, please let me know. We won't be able to use 0.17 (and thus image 0.24) in production until this is fixed.

Missing support for a couple of features, but seems to work.

This probably isn't ready to merge as is, but I thought I'd make the PR anyways to get some feedback.

Unfiltering paeth image data is particularly tricky because each pixel depends on both the pixel above and to the right. This PR adds a unfilter_paeth_strip method which processes 8 consecutive paeth filtered rows at a time, along with a bunch of rather messy bookkeeping to properly call it.

$ cargo run --example corpus-bench --release qoi_benchmark_suite

main   55 mps   0.19 GiB/s
PR     92 mps   0.31 GiB/s

The trick is that it processes pixels along a diagonal swatch of the strip. (I'll include some diagram/explanation like this in the final PR)

P = previous row passed as input
X = computed serially at start
. = first swatch processed with SIMD
0 = computed serially at end 

prev [PPPPPPPPPPPPPPPPPPPPPPPP]
row0 [XXXXXXXX.               ]
row1 [XXXXXXX.               0]
row2 [XXXXXX.               00]
row3 [XXXXX.               000]
row4 [XXXX.               0000]
row5 [XXX.               00000]
row6 [XX.               000000]
row7 [X.               0000000]

When a PNG has been encoded with fdeflate compression method added in #364, the decoder can make some assumptions that improve decoding performance. This PR adds a check on whether fdeflate compression was used and decompresses the image data accordingly.

• Factors out run_encode and run_decode into independent functions, making it easier to inspect performance in a profiler.
• Changes decoding to write into a pre-allocated buffer.
• Extra decimal place in the reported bandwidth numbers.

Add CIFuzz workflow action to have fuzzers build and run on each PR.

This is a service offered by OSS-Fuzz where image-png already runs (https://github.com/google/oss-fuzz/tree/master/projects/image-png). CIFuzz can help detect regressions and catch fuzzing build issues early, and has a variety of features (see the URL above). In the current PR the fuzzers gets build on a pull request and will run for 300 seconds.

Fixes https://github.com/image-rs/image/issues/1825

Before:

     Running `target/debug/test_rust`
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Format(FormatError { inner: DuplicateChunk { kind: ChunkType { type: iCCP, critical: false, private: false, reserved: false, safecopy: false } } })', src/main.rs:6966:42

After (using env_logger):

     Running `target/debug/test_rust`
[2022-11-21T12:00:04Z WARN  png::decoder::stream] iCCP chunks must appear at most once

Should other kinds of duplicate chunks be converted into warnings too?