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BrokenSuite
Suite of broken PNG images
Introduction
As a means of increasing test coverage, I started working on suite of images to cover all the possible error cases. It has subsequently also been used to improve the excellent pngcheck tool.
The code to generate the images is checked in: BrokenGenerator.java. In general I try to pick a simple image from PngSuite and mutate it by swapping chunks, adding in new chunks, etc. Contributions are welcome.
Download
All releases are tagged with the BrokenSuite label.
Images
This table lists all of the images in the latest release and the corresponding errors (the message of the exception that will be thrown).
| x00n0g01.png | Bad image size: 0x0 |
| xcrn0g04.png | Improper signature, expected 0x89504e470d0a1a0a, got 0x89504e470d0d0a1a |
| xlfn0g04.png | Improper signature, expected 0x89504e470d0a1a0a, got 0x89504e470a0a0a1a |
| bkgd_after_idat.png | bKGD cannot appear after IDAT |
| chrm_after_idat.png | cHRM cannot appear after IDAT |
| chrm_after_plte.png | cHRM cannot appear after PLTE |
| chunk_crc.png | Bad CRC value for IHDR chunk |
| chunk_length.png | Bad chunk length: 4294967276 |
| chunk_private_critical.png | Private critical chunk encountered: GaMA |
| chunk_type.png | Corrupted chunk type: 0x67614d5f |
| gama_after_idat.png | gAMA cannot appear after IDAT |
| gama_after_plte.png | gAMA cannot appear after PLTE |
| gama_zero.png | Meaningless zero gAMA chunk value |
| hist_after_idat.png | hIST cannot appear after IDAT |
| hist_before_plte.png | PLTE must precede hIST |
| iccp_after_idat.png | iCCP cannot appear after IDAT |
| iccp_after_plte.png | iCCP cannot appear after PLTE |
| ihdr_16bit_palette.png | Bad bit depth for color type 3: 16 |
| ihdr_1bit_alpha.png | Bad bit depth for color type 6: 1 |
| ihdr_bit_depth.png | Bad bit depth: 7 |
| ihdr_color_type.png | Bad color type: 1 |
| ihdr_compression_method.png | Unrecognized compression method: 1 |
| ihdr_filter_method.png | Unrecognized filter method: 1 |
| ihdr_image_size.png | Bad image size: -32x-32 |
| ihdr_interlace_method.png | Unrecognized interlace method: 2 |
| itxt_compression_flag.png | Illegal iTXt compression flag: 2 |
| itxt_compression_method.png | Unrecognized iTXt compression method: 1 |
| itxt_keyword_length.png | Invalid keyword length: 0 |
| itxt_keyword_length_2.png | Invalid keyword length: 80 |
| missing_idat.png | Required data chunk(s) not found |
| missing_ihdr.png | IHDR chunk must be first chunk |
| missing_plte.png | Required PLTE chunk not found |
| missing_plte_2.png | Required PLTE chunk not found |
| multiple_bkgd.png | Multiple bKGD chunks are not allowed |
| multiple_chrm.png | Multiple cHRM chunks are not allowed |
| multiple_gama.png | Multiple gAMA chunks are not allowed |
| multiple_hist.png | Multiple hIST chunks are not allowed |
| multiple_iccp.png | Multiple iCCP chunks are not allowed |
| multiple_ihdr.png | Multiple IHDR chunks are not allowed |
| multiple_offs.png | Multiple oFFs chunks are not allowed |
| multiple_pcal.png | Multiple pCAL chunks are not allowed |
| multiple_phys.png | Multiple pHYs chunks are not allowed |
| multiple_plte.png | Multiple PLTE chunks are not allowed |
| multiple_sbit.png | Multiple sBIT chunks are not allowed |
| multiple_scal.png | Multiple sCAL chunks are not allowed |
| multiple_srgb.png | Multiple sRGB chunks are not allowed |
| multiple_ster.png | Multiple sTER chunks are not allowed |
| multiple_time.png | Multiple tIME chunks are not allowed |
| multiple_trns.png | Multiple tRNS chunks are not allowed |
| nonconsecutive_idat.png | IDAT chunks must be consecutive |
| offs_after_idat.png | oFFs cannot appear after IDAT |
| pcal_after_idat.png | pCAL cannot appear after IDAT |
| phys_after_idat.png | pHYs cannot appear after IDAT |
| plte_after_idat.png | Required PLTE chunk not found |
| plte_empty.png | PLTE chunk cannot be empty |
| plte_in_grayscale.png | PLTE chunk found in grayscale image |
| plte_length_mod_three.png | PLTE chunk length indivisible by 3: 2 |
| plte_too_many_entries.png | Too many palette entries: 17 |
| plte_too_many_entries_2.png | Too many palette entries: 257 |
| sbit_after_idat.png | sBIT cannot appear after IDAT |
| sbit_after_plte.png | sBIT cannot appear after PLTE |
| scal_after_idat.png | sCAL cannot appear after IDAT |
| splt_after_idat.png | sPLT cannot appear after IDAT |
| srgb_after_idat.png | sRGB cannot appear after IDAT |
| srgb_after_plte.png | sRGB cannot appear after PLTE |
| ster_after_idat.png | sTER cannot appear after IDAT |
| time_value_range.png | tIME month value 0 is out of bounds (1-12) |
| trns_after_idat.png | tRNS cannot appear after IDAT |
| trns_bad_color_type.png | tRNS prohibited for color type 6 |
| trns_too_many_entries.png | Too many transparency palette entries (200 > 173) |
| phys_unit_specifier.png | Illegal pHYs chunk unit specifier: 2 |
| offs_unit_specifier.png | Illegal oFFs chunk unit specifier: 2 |
| scal_unit_specifier.png | Illegal sCAL chunk unit specifier: 3 |
| scal_floating_point.png | For input string: "Q.527777777778" |
| scal_negative.png | sCAL measurements must be >= 0 |
| scal_zero.png | sCAL measurements must be >= 0 |
| sbit_sample_depth.png | Illegal sBIT sample depth |
| sbit_sample_depth_2.png | Illegal sBIT sample depth |
| ster_mode.png | Unknown sTER mode: 2 |
| splt_sample_depth.png | Sample depth must be 8 or 16 |
| splt_length_mod_6.png | Incorrect sPLT data length for given sample depth |
| splt_length_mod_10.png | Incorrect sPLT data length for given sample depth |
| splt_duplicate_name.png | Duplicate suggested palette name Lemonade |
| ztxt_compression_method.png | Unrecognized compression method: 3 |
| ztxt_data_format.png | unknown compression method |
| length_ihdr.png | Bad IHDR chunk length: 14 (expected 13) |
| length_iend.png | Bad IEND chunk length: 1 (expected 0) |
| length_ster.png | Bad sTER chunk length: 2 (expected 1) |
| length_srgb.png | Bad sRGB chunk length: 2 (expected 1) |
| length_gama.png | Bad gAMA chunk length: 3 (expected 4) |
| length_phys.png | Bad pHYs chunk length: 8 (expected 9) |
| length_time.png | Bad tIME chunk length: 6 (expected 7) |
| length_offs.png | Bad oFFs chunk length: 8 (expected 9) |
| length_chrm.png | Bad cHRM chunk length: 31 (expected 32) |
| length_gifg.png | Bad gIFg chunk length: 5 (expected 4) |
| length_trns_gray.png | Bad tRNS chunk length: 0 (expected 2) |
| length_trns_rgb.png | Bad tRNS chunk length: 0 (expected 6) |
| length_trns_palette.png | Too many transparency palette entries (174 > 173) |
| length_hist.png | Bad hIST chunk length: 28 (expected 30) |
| length_sbit.png | Bad sBIT chunk length: 4 (expected 3) |
| length_sbit_2.png | Bad sBIT chunk length: 3 (expected 1) |
| length_bkgd_gray.png | Bad bKGD chunk length: 6 (expected 2) |
| length_bkgd_rgb.png | Bad bKGD chunk length: 2 (expected 6) |
| length_bkgd_palette.png | Bad bKGD chunk length: 6 (expected 1) |
| truncate_zlib.png | Unexpected end of ZLIB input stream |
| truncate_zlib_2.png | Unexpected end of ZLIB input stream |
| truncate_idat_0.png | Unexpected end of image data |
| truncate_idat_1.png | Unexpected end of image data |
| unknown_filter_type.png | Unrecognized filter type 5 |
| text_trailing_null.png | Text value contains null |
| private_compression_method.png | Unrecognized compression method: 128 |
| private_filter_method.png | Unrecognized filter method: 128 |
| private_interlace_method.png | Unrecognized interlace method: 128 |
| private_filter_type.png | Unrecognized filter type 128 |
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