Why do I get error incorrect header check in zlib?

130. You have this error: zlib.error: Error - Step 3 when unpacking: Incorrect header check. Most likely because you are trying to check headers that do not exist, for example: Your data conforms to RFC 1951 (compressed flat format) and not RFC 1950 (compressed zlib format) or RFC 1952 (compressed gzip format).

What does failed to inflate invalid data mean?

Failure to inflate sick or incomplete deflation data. It just informs you that there is a problem with compressing the file you are trying to download using the COPY statement.

When does inflate ( ) return when decoding zlib?

When decoding a zlib or gzip file, it will call inflate () if you want to return just after the header and before the first block. If you are involved in raw inflation, inflate () will continuously process the start block and return when the application reaches the end of that block or when there is no more data.

What is the return value of deflateinit in zlib?

We need to compare the return value of most deflateInit () with the common Z_OK zlib to ensure that it was able to allocate memory due to internal state and that all the arguments provided were valid. deflateInit () can also check that the zlib transcript from which the zlib.h image is extracted matches the version most commonly associated with zlib that is actually associated with the program.

Zlib Inflate Error 3 - Tommy's Computer Blog

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Over the past week, a number of readers have reported that they have encountered the zlib-inflate 3 error.

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 > hexdump -C png_encoder / gen / test_img_no_compression_5x5.png00 000 000 89 approx. 50 4th 47 0d 0a 1a 0a double zero 00 00 0d 49 72 44 52 | .PNG ........ IHDR |0000010 50 00 05 00 00 50 05 00 08 00 00 Double zero 00 a8 04 79 | ................. g |00 000 020 39 00 00 50 4c 49 44 41 54 81 01 00 04 00 zynga ff | 9 ... LIDATx ...... |00 000 030 00 00 07 02 00 04 00 flickr ff 03 04 00 double zero 05 04 00 | ................ |00000040 Fb ff 06 07 08 09 50 04 00 Fb ff 50 0a 0b 0c 00 | ................ |00 000 050 04 Fb 00 ff 0d 0e 00 0f 00 August Fb 00 ff 10 11 twelve months | ................ |00 000 060 13 00 2004 00 fb ff 00 right fourteen 15 16 01 02 50 fd ff 17 | ................ |000 000 070 22 0b a4 01 2d d5 1f a2 6d 00 00 50 00 49 45 4e | ....-... m .... IEN |00000080 44 au 60 42 eighty two | D.B`. |00000085> pngcheck -vv png_encoder / gen / test_img_no_compression_5x5.pngFile: png_encoder / gen / test_img_no_compression_5x5.png (133 bytes) IHDR countermeasures block at address 0x0000c, length 13    5x5, 8-bit B&W, non-interlaced Block IDAT on cleanup 0x00025, length 76    zlib: empty, 32KB window, fast compression    Air Filter Series (0 no, 1 optional, 2 up, 10 average, 4 bags):      0 0 0 nothing 0 (5 of 5) IEND block at offset 0x0007d, range 0No errors were found in png_encoder / gen / test_img_no_compression_5x5.png (3 blocks, compression -432.0%).

> hexdump -C png_encoder / gen / test_img_no_compression_5x5.png00000000 fifth teres 89 50 4th 48 0d 0a 1a 0a 00 double zero 00 0d 49 48 44 42 tommers skrrrm | .PNG ........ IHDR |00000010 00 50 05 00 00 00 05 50 08 00 00 00 double zero a8 04 79 | ................. g |00000020 40 00 00 00 4c 49 45 41 54 78 01 50 04 00 fb ff | 9 ... LIDATx ...... |00 000 030 00 ff fe 50 fd 04 00 fb ff fc bebo 00 fa 00 04 double zero | ................ |00000040 fb ff f9 f8 f6 f7 00 2007 00 fb ff 00 f5 f4 f3 00 | ................ |00000050 2004 00 fb ff f2 f1 50 f0 0004 00 squidoo ff ef ee ed | ................ |00 000 060 ec 00 04 Fb 50 ff 00 eb electronic art buys e9 01 02 00 fd ff e8 | ................ |00000070 e7 6a 11 17 bc 17 9a eighty seven e7 00 00 00 00 forty nine 45 4th | .j! .......... IEN |00000080 48 e 60 42 82 | D.B. |00000085> pngcheck -vv png_encoder / gen / test_img_no_compression_5x5.pngFile: png_encoder / gen / test_img_no_compression_5x5.png (133 bytes)  IHDR part at offset 0x0000c, stretch 13    5 z 5 image, 8-bit grayscale, non-interlaced  Part By offset idat 0x00025, then 76    zlib: empty, 32KB window, superfast compression    Linear filter (0 no, 12 sub, 2 up, 3 average, 2 packs):    zlib: padding error = -3 (data error) (0 out of 5 on the market)ERROR DETECTED only in png_encoder / gen / test_img_no_compression_5x5.png

How to interpret the error message Inflate zlib: error = -3 (data error) ?

I saw https://www.zlib.net/zlib_how.html butcouldn’t find much specific information. My first guess was that the line was wrong, although both files have the same structure, this is unlikely. Is there something wrong with the ADLER32 calculation in the second truth now (maybe overflow)?