tree: a75dd227ffd03e994d19e1db3ba5560f48b0b51b [path history] [tgz]
  2. analysis/
  3. animated-red-blue.gif
  4. animated-red-blue.nia
  5. artificial/
  6. australian-abc-local-stations.json
  7. australian-abc-local-stations.tokens
  8. bricks-color.bmp
  9. bricks-color.jpeg
  10. bricks-color.lossless.webp
  11. bricks-color.lossy.webp
  12. bricks-color.png
  13. bricks-color.tiff
  14. bricks-dither.bmp
  15. bricks-dither.gif
  16. bricks-dither.indexes
  17. bricks-dither.indexes.giflzw
  18. bricks-dither.lossless.webp
  19. bricks-dither.palette
  20. bricks-dither.png
  21. bricks-gray.bmp
  22. bricks-gray.gif
  23. bricks-gray.indexes
  24. bricks-gray.indexes.giflzw
  25. bricks-gray.jpeg
  26. bricks-gray.lossless.webp
  27. bricks-gray.lossy.webp
  28. bricks-gray.png
  29. bricks-gray.tiff
  30. bricks-nodither.bmp
  31. bricks-nodither.gif
  32. bricks-nodither.indexes
  33. bricks-nodither.indexes.giflzw
  34. bricks-nodither.lossless.webp
  35. bricks-nodither.palette
  36. bricks-nodither.png
  37. bricks-nodither.wbmp
  38. cbor-rfc-7049-examples.cbor
  39. cbor-rfc-7049-examples.sans-comments.json
  40. cbor-rfc-7049-examples.tokens
  41. cbor-rfc-7049-examples.with-comments.json
  42. crude-flag.nia
  43. crude-flag.nie
  44. crude-flag.nii
  45. file-sizes.json
  46. gifplayer-muybridge.gif
  47. github-tags.json
  48. harvesters.bmp
  49. harvesters.gif
  50. harvesters.jpeg
  51. harvesters.lossless.webp
  52. harvesters.lossy.webp
  53. harvesters.png
  54. harvesters.tiff
  55. hat.bmp
  56. hat.gif
  57. hat.jpeg
  58. hat.lossless.webp
  59. hat.lossy.webp
  60. hat.png
  61. hat.tiff
  62. hat.wbmp
  63. hibiscus.primitive.bmp
  64. hibiscus.primitive.gif
  65. hibiscus.primitive.jpeg
  66. hibiscus.primitive.lossless.webp
  67. hibiscus.primitive.lossy.webp
  68. hibiscus.primitive.png
  69. hibiscus.primitive.svg
  70. hibiscus.primitive.tiff
  71. hibiscus.regular.bmp
  72. hibiscus.regular.gif
  73. hibiscus.regular.jpeg
  74. hibiscus.regular.lossless.webp
  75. hibiscus.regular.lossy.webp
  76. hibiscus.regular.png
  77. hibiscus.regular.tiff
  78. hippopotamus.bmp
  79. hippopotamus.interlaced.gif
  80. hippopotamus.interlaced.png
  81. hippopotamus.interlaced.truncated.gif
  82. hippopotamus.jpeg
  83. hippopotamus.lossless.webp
  84. hippopotamus.lossy.webp
  85. hippopotamus.masked-with-muybridge.gif
  86. hippopotamus.masked-with-muybridge.png
  87. hippopotamus.nie
  88. hippopotamus.regular.gif
  89. hippopotamus.regular.png
  90. hippopotamus.tiff
  91. json-quirks.json
  92. json-quirks.tokens
  93. json-things.cbor
  94. json-things.formatted.json
  95. json-things.unformatted.json
  96. json-things.unformatted.tokens
  97. midsummer.txt
  98. midsummer.txt.gz
  99. midsummer.txt.zlib
  100. muybridge-frame-000.indexes
  101. muybridge-frame-000.wbmp
  102. muybridge-frame-001.indexes
  103. muybridge-frame-002.indexes
  104. muybridge-frame-003.indexes
  105. muybridge-frame-004.indexes
  106. muybridge-frame-005.indexes
  107. muybridge-frame-006.indexes
  108. muybridge-frame-007.indexes
  109. muybridge-frame-008.indexes
  110. muybridge-frame-009.indexes
  111. muybridge-frame-010.indexes
  112. muybridge-frame-011.indexes
  113. muybridge-frame-012.indexes
  114. muybridge-frame-013.indexes
  115. muybridge-frame-014.indexes
  116. muybridge.gif
  117. nobel-prizes.json
  118. pi.txt
  119. pi.txt.giflzw
  120. pi.txt.gz
  121. pi.txt.zlib
  122. pjw-thumbnail.bmp
  123. pjw-thumbnail.gif
  124. pjw-thumbnail.jpeg
  125. pjw-thumbnail.lossless.webp
  126. pjw-thumbnail.lossy.webp
  127. pjw-thumbnail.png
  128. pjw-thumbnail.tiff
  129. rfc-6901-json-pointer.json
  130. rgb24png.bmp
  131. romeo.txt
  132. romeo.txt.deflate
  133. romeo.txt.fixed-huff.deflate
  134. romeo.txt.gz
  135. romeo.txt.zlib
  136. sheep-more.rac

Unless otherwise noted, the *.gzfiles were generated by the gzip command line tool and the *.deflate and *.zlib versions were then generated by script/extract-deflate-offsets.go. Similarly, the *.giflzw files were generated by script/extract-giflzw.go and the *.palette and *.indexes files were generated by script/extract-palette-indexes.go. The *.tokens files were generated by script/print-json-token-debug-format.c.

The *.jpeg files are usually the canonical versions of the test/data images, and other versions (*.bmp, *.gif, *.png, *.tiff) were generated by ImageMagick's convert command line tool. The *.wbmp versions were generated by the script/convert-png-to-wbmp.go command line tool. The *.webp versions were generated by the cwebp command line tool.

The artificial directory holds artificially generated test data, often to explicitly test corner cases of various file formats. The files there usually come in families whose names have a common prefix, such as three files,, all prefixed by The file whose name is that prefix is usually the canonical (typically hand-crafted) file, and the other files are then derived from that. Outside of the artificial directory, the other files in this directory are typically real world examples of various file formats, or deriviations of them.

animated-red-blue.gif is an original animation by Nigel Tao

australian-abc-local-stations.json was crawled from

bricks-* are various encodings of an original photo by Nigel Tao

cbor-rfc-7049-examples.cbor is the concatenated examples from RFC 7049. The cbor-rfc-7049-examples.*.json files were then generated by example/cbor-to-json.

crude-flag.* is an original animation by Nigel Tao See the lib/nie documentation.

file-sizes.json was created by running script/print-file-sizes-json.go in this repository's root directory.

gifplayer-muybridge.gif is an original animation by Nigel Tao

harvesters.* are various encodings of a photo of “The Harvesters” by Pieter Bruegel the Elder, held by the Metropolitan Museum of Art. lists that image as in the public domain.

github-tags.json was crawled from

hat.* are various encodings of a photo of “Self-Portrait with a Straw Hat (obverse: The Potato Peeler)” by Vincent van Gogh, held by the Metropolitan Museum of art. lists that image as in the public domain.

hibiscus.regular.* are various encodings of a photo of “Hibiscus and Parrots” by Louis Comfort Tiffany, held by the Metropolitan Museum of Art. lists that image as in the public domain.

hibiscus.primitive.* is the result of running the hibiscus.regular.png image through and other programs:

  • primitive -i hibiscus.regular.png -o hibiscus.primitive.svg -s 442 -n 32
  • inkscape -z -e hibiscus.primitive.png hibiscus.primitive.svg
  • Various invocations of convert and cwebp

hippopotamus.* are various encodings of a cropping of a photo of “Hippopotamus (William)”, held by the Metropolitan Museum of Art. lists that image as in the public domain. says that “You are welcome to use images of artworks in The Met collection that the Museum believes to be in the public domain, or those to which the Museum waives any copyright it might have, for any purpose, including commercial and noncommercial use, free of charge and without requiring permission from the Museum.”

json-things.* are original JSON objects by Nigel Tao

midsummer.txt is an excerpt of Shakespeare‘s "A Midsummer Night’s Dream", copied from

muybridge.gif is derived from which is in the public domain.

nobel-prizes.json was crawled from

pi.txt contains the digits of pi.

pjw-thumbnail.* are various encodings of an image derived from an iconic, original photo of Peter J. Weinberger by Rob Pike

rfc-6901-json-pointer.json is the example JSON document given in the RFC 6901 “JavaScript Object Notation (JSON) Pointer” specification.

rgb24png.bmp comes from BMP Suite, which states that its generated images “are in the public domain”.

romeo.txt is an excerpt of Shakespeare's “Romeo and Juliet”, copied from

romeo.txt.fixed-huff.deflate was derived from romeo.txt by a custom program to use fixed (not dynamic) Huffman tables for the deflate encoding.

sheep-more.rac is a RAC-compression of original text by Nigel Tao