base38: add enumerated-media-types.txt
diff --git a/doc/note/base38-and-fourcc.md b/doc/note/base38-and-fourcc.md
index 9f35f6a..4b0d8c4 100644
--- a/doc/note/base38-and-fourcc.md
+++ b/doc/note/base38-and-fourcc.md
@@ -43,6 +43,9 @@
The base38 encoding of `"jpeg"` is `0x1153D3`, which is `1135571`, which is
`((20 * (38 ** 3)) + (26 * (38 ** 2)) + (15 * (38 ** 1)) + (17 * (38 ** 0)))`.
+The base38 encoding of `"ping"` is `0x1633BD`, which is `1455037`, which is
+`((26 * (38 ** 3)) + (19 * (38 ** 2)) + (24 * (38 ** 1)) + (17 * (38 ** 0)))`.
+
The minimum base38 value, 0x000000, corresponds to `"...."`. Depending on
context, this can be used as a default, built-in or placeholder value.
@@ -70,3 +73,86 @@
- [Quirk values](/doc/note/quirks.md) use this `((namespace << 10) | local)`
scheme.
- [Tokens](/doc/note/tokens.md) assign 21 out of 64 bits for a base38 value.
+
+
+### Base38 4/4/4 and 4/4/2
+
+3×21 bits fits snugly into a `int64_t` or `uint64_t` (the sign or high bit is
+unused). 63 bits can therefore hold a 12-character or three 4-character strings
+(taken from base38's limited alphabet).
+
+For example, in a custom RPC protocol, the namespace/class/method name could be
+base38-encoded as a 4/4/4 string like `"net./conn/ping"`. As a number, this
+would be `((0x147150 << 42) | (0x0B7324 << 21) | 0x1633BD)` which is
+`0x51C5416E_649633BD`. At the wire format level, this would occupy a
+fixed-length (8 bytes) and that 64th bit could, for example, indicate request
+or response.
+
+A 2-character string can fit in 11 bits, as `38 ** 2 = 0x5A4 = 1444` is smaller
+than `2 ** 11 = 0x800 = 2048`. 53 bits can therefore hold a 10-character or
+4/4/2 alpha-numeric-ish string. 53 bits also fits snugly under JavaScript's
+`Number.MAX_SAFE_INTEGER` - these integers can be losslessly stored in a
+`double` or `float64_t`.
+
+[Enumerated Media Types](./enumerated-media-types.txt) uses this base38 4/4/2
+encoding, mapping `"image/jpeg"` to the base38 `"imag/jpeg/.."` which is
+`((0x106BF7 << 32) | (0x1153D3 << 11) | 0x000)` which is `0x106BF7_8A9E9800`.
+Some more examples:
+
+- `0x09CC62_A9E37800 = "appl/octe/.." = "application/octet-stream"`
+- `0x09CC62_B0B24000 = "appl/pdf./.." = "application/pdf"`
+- `0x09CC62_DACDFC4E = "appl/voao/s." = "application/vnd.oasis.opendocument.spreadsheet"`
+- `0x09CC62_DACDFC6C = "appl/voao/st" = "application/vnd.oasis.opendocument.spreadsheet-template"`
+- `0x09CC62_DACDFC74 = "appl/voao/t." = "application/vnd.oasis.opendocument.text"`
+- `0x09CC62_DADFCC6B = "appl/vopo/ss" = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"`
+- `0x106BF7_8A9E9800 = "imag/jpeg/.." = "image/jpeg"`
+- `0x106BF7_B276B000 = "imag/png./.." = "image/png"`
+- `0x106BF7_FE887DA3 = "imag/~~~~/~~" = "image/*"`
+- `0x197816_7DF74000 = "text/html/.." = "text/html"`
+- `0x197816_B215E800 = "text/plai/.." = "text/plain"`
+
+
+### Base38 Alphabet
+
+Case-insensitive alpha-numeric, roughly speaking.
+
+```
+'.' = 0
+'0' = 1
+'1' = 2
+'2' = 3
+'3' = 4
+'4' = 5
+'5' = 6
+'6' = 7
+'7' = 8
+'8' = 9
+'9' = 10
+'a' = 11
+'b' = 12
+'c' = 13
+'d' = 14
+'e' = 15
+'f' = 16
+'g' = 17
+'h' = 18
+'i' = 19
+'j' = 20
+'k' = 21
+'l' = 22
+'m' = 23
+'n' = 24
+'o' = 25
+'p' = 26
+'q' = 27
+'r' = 28
+'s' = 29
+'t' = 30
+'u' = 31
+'v' = 32
+'w' = 33
+'x' = 34
+'y' = 35
+'z' = 36
+'~' = 37
+```
diff --git a/doc/note/enumerated-media-types.txt b/doc/note/enumerated-media-types.txt
new file mode 100644
index 0000000..389cd3c
--- /dev/null
+++ b/doc/note/enumerated-media-types.txt
@@ -0,0 +1,233 @@
+# Enumerated Media Types
+# ----------------------
+#
+# This is a curated list of about 200 common Media Types (also known as MIME
+# Types). The official name, with variable length, is in the fourth column. A
+# fixed length contraction, presented in 4/4/2 format, is in the third column.
+# The base38 numeric encoding of that 4/4/2 string is in the first (hex) and
+# second (decimal) columns. These positive numbers are all less than or equal
+# to ((1<<53)-1), also known as Number.MAX_SAFE_INTEGER in JavaScript, and so
+# generally safe to pass around as a JSON value, float64, int64 or uint64.
+#
+# As an int64 or uint64, the high 32 bits (of which only 21 are used) hold the
+# top-level type: 0x09CC62 means "application", 0x106BF7 means "image", etc.
+#
+# Using fixed-size numbers instead of variable-length strings can be useful in
+# file formats, wire protocols, database tables or other contexts where dynamic
+# memory allocation is unavailable or fallible or where variable-length data
+# complicates matters. At the micro-optimization level, comparing or hashing
+# uint64 numbers is also faster than for arbitrary strings.
+#
+# Using a sparse enumeration (instead of the dense 1 = "application/epub+zip",
+# 2 = "application/java-archive", etc) means that, when debugging or logging,
+# the numerical value can be converted to a somewhat-human-readable form (the
+# "appl/java/ar" 4/4/2 string) purely algorithmically, without a lookup table.
+# Inserting new entries can also preserve the sortedness of the 4/4/2 form
+# without requiring renumbering.
+#
+# When debugging, if the numerical value is all that you know, grepping a large
+# codebase for 0x09CC62_880DB9BE or 2757998351858110 will also produce far
+# fewer false positives than grepping for 2.
+#
+# The pua.example subtypes (e.g. for private use within a system that deals
+# with "foobar.example" files) are an unofficial suggestion for entries not in
+# the official IANA registry, similar to Unicode's Private Use Area. For a PUA
+# entry's 4/4/2 string, the middle-4 starts with a "~" (and cannot be "~~~~")
+# but the rest of the middle-4-right-2 is freeform.
+#
+# The official IANA Media Types registry:
+# https://www.iana.org/assignments/media-types/media-types.xhtml
+#
+# A popular subset of that registry, with about 800 entries, as well as a
+# mapping between Media Types (like "application/java-archive") and filename
+# extensions (like ".jar"):
+# https://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types
+#
+# This file (enumerated-media-types.txt) is canonically hosted in the doc/note
+# directory of the github.com/google/wuffs repository. That same directory also
+# holds a base38-and-fourcc.md file that elaborates on base38 encoding.
+
+0x09CC62_6933B000 2757997834252288 appl/epub/.. application/epub+zip
+0x09CC62_880DB9BE 2757998351858110 appl/java/ar application/java-archive
+0x09CC62_880DBC67 2757998351858791 appl/java/so application/java-serialized-object
+0x09CC62_880DBCD7 2757998351858903 appl/java/vm application/java-vm
+0x09CC62_8B321000 2757998404571136 appl/json/.. application/json
+0x09CC62_9C23B800 2757998688843776 appl/mate/.. application/mathematica
+0x09CC62_9C23F800 2757998688860160 appl/matm/.. application/mathml+xml
+0x09CC62_9F53D800 2757998742329344 appl/mswo/.. application/msword
+0x09CC62_A9E37800 2757998919514112 appl/octe/.. application/octet-stream
+0x09CC62_B0B24000 2757999033729024 appl/pdf./.. application/pdf
+0x09CC62_B2B30000 2757999067332608 appl/post/.. application/postscript
+0x09CC62_C0E9C000 2757999305801728 appl/rtf./.. application/rtf
+0x09CC62_C664E000 2757999397756928 appl/smil/.. application/smil+xml
+0x09CC62_CE584000 2757999531147264 appl/ttml/.. application/ttml+xml
+0x09CC62_D86553E7 2757999699776487 appl/vand/pa application/vnd.android.package-archive
+0x09CC62_D8681384 2757999699956612 appl/vapp/mp application/vnd.apple.mpegurl
+0x09CC62_D9754B34 2757999717600052 appl/vgoe/kl application/vnd.google-earth.kml+xml
+0x09CC62_D9754B42 2757999717600066 appl/vgoe/kz application/vnd.google-earth.kmz
+0x09CC62_D9C13800 2757999722575872 appl/vicc/.. application/vnd.iccprofile
+0x09CC62_DA1CBB29 2757999728573225 appl/vkde/ka application/vnd.kde.karbon
+0x09CC62_DA1CBB2B 2757999728573227 appl/vkde/kc application/vnd.kde.kchart
+0x09CC62_DA1CBB2E 2757999728573230 appl/vkde/kf application/vnd.kde.kformula
+0x09CC62_DA1CBB31 2757999728573233 appl/vkde/ki application/vnd.kde.kivio
+0x09CC62_DA1CBB37 2757999728573239 appl/vkde/ko application/vnd.kde.kontour
+0x09CC62_DA1CBB38 2757999728573240 appl/vkde/kp application/vnd.kde.kpresenter
+0x09CC62_DA1CBB3B 2757999728573243 appl/vkde/ks application/vnd.kde.kspread
+0x09CC62_DA1CBB3F 2757999728573247 appl/vkde/kw application/vnd.kde.kword
+0x09CC62_DA8851F9 2757999735624185 appl/vms./ca application/vnd.ms-cab-compressed
+0x09CC62_DA88525C 2757999735624284 appl/vms./ex application/vnd.ms-excel
+0x09CC62_DA8852CA 2757999735624394 appl/vms./ht application/vnd.ms-htmlhelp
+0x09CC62_DA8853F5 2757999735624693 appl/vms./po application/vnd.ms-powerpoint
+0x09CC62_DACDF9EE 2757999740189166 appl/voao/c. application/vnd.oasis.opendocument.chart
+0x09CC62_DACDFA0C 2757999740189196 appl/voao/ct application/vnd.oasis.opendocument.chart-template
+0x09CC62_DACDFA14 2757999740189204 appl/voao/d. application/vnd.oasis.opendocument.database
+0x09CC62_DACDFA60 2757999740189280 appl/voao/f. application/vnd.oasis.opendocument.formula
+0x09CC62_DACDFA7E 2757999740189310 appl/voao/ft application/vnd.oasis.opendocument.formula-template
+0x09CC62_DACDFA86 2757999740189318 appl/voao/g. application/vnd.oasis.opendocument.graphics
+0x09CC62_DACDFAA4 2757999740189348 appl/voao/gt application/vnd.oasis.opendocument.graphics-template
+0x09CC62_DACDFAD2 2757999740189394 appl/voao/i. application/vnd.oasis.opendocument.image
+0x09CC62_DACDFAF0 2757999740189424 appl/voao/it application/vnd.oasis.opendocument.image-template
+0x09CC62_DACDFBDC 2757999740189660 appl/voao/p. application/vnd.oasis.opendocument.presentation
+0x09CC62_DACDFBFA 2757999740189690 appl/voao/pt application/vnd.oasis.opendocument.presentation-template
+0x09CC62_DACDFC4E 2757999740189774 appl/voao/s. application/vnd.oasis.opendocument.spreadsheet
+0x09CC62_DACDFC6C 2757999740189804 appl/voao/st application/vnd.oasis.opendocument.spreadsheet-template
+0x09CC62_DACDFC74 2757999740189812 appl/voao/t. application/vnd.oasis.opendocument.text
+0x09CC62_DACDFC8B 2757999740189835 appl/voao/tm application/vnd.oasis.opendocument.text-master
+0x09CC62_DACDFC92 2757999740189842 appl/voao/tt application/vnd.oasis.opendocument.text-template
+0x09CC62_DACDFC95 2757999740189845 appl/voao/tw application/vnd.oasis.opendocument.text-web
+0x09CC62_DADFCBF6 2757999741357046 appl/vopo/pp application/vnd.openxmlformats-officedocument.presentationml.presentation
+0x09CC62_DADFCBF8 2757999741357048 appl/vopo/pr application/vnd.openxmlformats-officedocument.presentationml.slide
+0x09CC62_DADFCBF9 2757999741357049 appl/vopo/ps application/vnd.openxmlformats-officedocument.presentationml.slideshow
+0x09CC62_DADFCBFA 2757999741357050 appl/vopo/pt application/vnd.openxmlformats-officedocument.presentationml.template
+0x09CC62_DADFCC6B 2757999741357163 appl/vopo/ss application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
+0x09CC62_DADFCC6C 2757999741357164 appl/vopo/st application/vnd.openxmlformats-officedocument.spreadsheetml.template
+0x09CC62_DADFCCF4 2757999741357300 appl/vopo/wd application/vnd.openxmlformats-officedocument.wordprocessingml.document
+0x09CC62_DADFCD04 2757999741357316 appl/vopo/wt application/vnd.openxmlformats-officedocument.wordprocessingml.template
+0x09CC62_DF1E4800 2757999812560896 appl/wasm/.. application/wasm
+0x09CC62_E5514000 2757999916564480 appl/x7z./.. application/x-7z-compressed
+0x09CC62_E5BCB800 2757999923607552 appl/xabi/.. application/x-abiword
+0x09CC62_E5CD9227 2757999924711975 appl/xapp/di application/x-apple-diskimage
+0x09CC62_E5F28000 2757999927132160 appl/xbit/.. application/x-bittorrent
+0x09CC62_E605D800 2757999928399872 appl/xbz2/.. application/x-bzip2
+0x09CC62_E61DF800 2757999929980928 appl/xche/.. application/x-chess-pgn
+0x09CC62_E6477000 2757999932698624 appl/xdeb/.. application/x-debian-package
+0x09CC62_E653B800 2757999933503488 appl/xdoo/.. application/x-doom
+0x09CC62_E65BD800 2757999934035968 appl/xdvi/.. application/x-dvi
+0x09CC62_E6DA1800 2757999942309888 appl/xgnu/.. application/x-gnumeric
+0x09CC62_E70E1800 2757999945717760 appl/xhtm/.. application/xhtml+xml
+0x09CC62_E73A1800 2757999948601344 appl/xiso/.. application/x-iso9660-image
+0x09CC62_E7AC4000 2757999956082688 appl/xlat/.. application/x-latex
+0x09CC62_E7E58000 2757999959834624 appl/xml./.. application/xml
+0x09CC62_E7E5F000 2757999959863296 appl/xmld/.. application/xml-dtd
+0x09CC62_E7EDD1BC 2757999960379836 appl/xms./ap application/x-ms-application
+0x09CC62_E7EDD460 2757999960380512 appl/xms./sh application/x-ms-shortcut
+0x09CC62_E7EE4000 2757999960408064 appl/xmsd/.. application/x-msdownload
+0x09CC62_E8BAF000 2757999973822464 appl/xrar/.. application/x-rar-compressed
+0x09CC62_E8EF8000 2757999977267200 appl/xsh./.. application/x-sh
+0x09CC62_E8F04800 2757999977318400 appl/xsho/.. application/x-shockwave-flash
+0x09CC62_E8FAE000 2757999978012672 appl/xsql/.. application/x-sql
+0x09CC62_E9153000 2757999979737088 appl/xtar/.. application/x-tar
+0x09CC62_E91A2000 2757999980060672 appl/xtex/.. application/x-tex
+0x09CC62_E91A2277 2757999980061303 appl/xtex/fm application/x-tex-tfm
+0x09CC62_E91A22EA 2757999980061418 appl/xtex/in application/x-texinfo
+0x09CC62_E9E68000 2757999993454592 appl/xxz./.. application/x-xz
+0x09CC62_F49B4000 2758000173072384 appl/zip./.. application/zip
+0x09CC62_FAA35800 2758000274266112 appl/~exa/.. application/pua.example
+0x09CC62_FE887DA3 2758000339615139 appl/~~~~/~~ application/*
+
+0x09E6CB_1DE9D000 2787034845007872 audi/3gpp/.. audio/3gpp
+0x09E6CB_4C087000 2787035618766848 audi/acc3... audio/ac3
+0x09E6CB_4DDD6000 2787035649499136 audi/amr./.. audio/amr
+0x09E6CB_4DDE6800 2787035649566720 audi/amrw/.. audio/amr-wb
+0x09E6CB_52746800 2787035726505984 audi/basi/.. audio/basic
+0x09E6CB_9D79D800 2787036985153536 audi/midi/.. audio/midi
+0x09E6CB_9E86B000 2787037002772480 audi/mobx/.. audio/mobile-xmf
+0x09E6CB_9EAA7000 2787037005115392 audi/mp4./.. audio/mp4
+0x09E6CB_9EB6D800 2787037005928448 audi/mpeg/.. audio/mpeg
+0x09E6CB_AA881000 2787037204189184 audi/ogg./.. audio/ogg
+0x09E6CB_E5BB5800 2787038197405696 audi/xaac/.. audio/x-aac
+0x09E6CB_E5C4F000 2787038198034432 audi/xaif/.. audio/x-aiff
+0x09E6CB_E6A9F800 2787038213044224 audi/xfla/.. audio/x-flac
+0x09E6CB_E7D96000 2787038232928256 audi/xmat/.. audio/x-matroska
+0x09E6CB_E7EB3800 2787038234097664 audi/xmpu/.. audio/x-mpegurl
+0x09E6CB_E7EDD4F1 2787038234268913 audi/xms./wa audio/x-ms-wax
+0x09E6CB_E7EDD4FD 2787038234268925 audi/xms./wm audio/x-ms-wma
+0x09E6CB_E8702000 2787038242807808 audi/xpnr/.. audio/x-pn-realaudio
+0x09E6CB_E99CB000 2787038262505472 audi/xwav/.. audio/x-wav
+0x09E6CB_FE887DA3 2787038613503395 audi/~~~~/~~ audio/*
+
+0x0DF632_5B96B000 3929870842638336 font/coll/.. font/collection
+0x0DF632_ACD18000 3929872205447168 font/otf./.. font/otf
+0x0DF632_CE4F4000 3929872767336448 font/ttf./.. font/ttf
+0x0DF632_E1866000 3929873089716224 font/woff/.. font/woff
+0x0DF632_E1866072 3929873089716338 font/woff/2. font/woff2
+0x0DF632_FE887DA3 3929873576394147 font/~~~~/~~ font/*
+
+0x106BF7_4F695000 4622309560766464 imag/avif/.. image/avif
+0x106BF7_548DC000 4622309647040512 imag/bmp./.. image/bmp
+0x106BF7_754B2000 4622310196322304 imag/gif./.. image/gif
+0x106BF7_8A8FD000 4622310553145344 imag/jp2./.. image/jp2
+0x106BF7_8A9E9800 4622310554114048 imag/jpeg/.. image/jpeg
+0x106BF7_8AB4A000 4622310555557888 imag/jpx./.. image/jpx
+0x106BF7_8C0F6000 4622310578282496 imag/jxl./.. image/jxl
+0x106BF7_921BE000 4622310679764992 imag/ktx./.. image/ktx
+0x106BF7_B276B000 4622311222587392 imag/png./.. image/png
+0x106BF7_C7F90000 4622311583449088 imag/svgx/.. image/svg+xml
+0x106BF7_CC5F6000 4622311657267200 imag/tiff/.. image/tiff
+0x106BF7_D859CBF9 4622311858228217 imag/vado/ps image/vnd.adobe.photoshop
+0x106BF7_D8E88000 4622311867580416 imag/vdjv/.. image/vnd.djvu
+0x106BF7_DC3704F2 4622311923057906 imag/vwap/wb image/vnd.wap.wbmp
+0x106BF7_DFBEB000 4622311982280704 imag/webp/.. image/webp
+0x106BF7_E7271800 4622312106563584 imag/xico/.. image/x-icon
+0x106BF7_E87151B9 4622312128205241 imag/xpor/am image/x-portable-anymap
+0x106BF7_E87151DF 4622312128205279 imag/xpor/bm image/x-portable-bitmap
+0x106BF7_E871529D 4622312128205469 imag/xpor/gm image/x-portable-graymap
+0x106BF7_E87153F3 4622312128205811 imag/xpor/pm image/x-portable-pixmap
+0x106BF7_E91BC800 4622312139376640 imag/xtga/.. image/x-tga
+0x106BF7_FAA35800 4622312433473536 imag/~exa/.. image/pua.example
+0x106BF7_FE887DA3 4622312498822563 imag/~~~~/~~ image/*
+
+0x13F426_4DB31800 5616469907019776 mult/alte/.. multipart/alternative
+0x13F426_56B07800 5616470057842688 mult/byte/.. multipart/byteranges
+0x13F426_6FB61800 5616470477641728 mult/form/.. multipart/form-data
+0x13F426_9D917800 5616471246993408 mult/mixe/.. multipart/mixed
+0x13F426_E7E30000 5616472493850624 mult/xmix/.. multipart/x-mixed-replace
+0x13F426_FE887DA3 5616472873794979 mult/~~~~/~~ multipart/*
+
+0x197816_59144800 7168911796881408 text/cacm/.. text/cache-manifest
+0x197816_591EB800 7168911797565440 text/cale/.. text/calendar
+0x197816_5C52D000 7168911851311104 text/css./.. text/css
+0x197816_5C566000 7168911851544576 text/csv./.. text/csv
+0x197816_7DF74000 7168912415735808 text/html/.. text/html
+0x197816_880E4800 7168912585017344 text/javs/.. text/javascript
+0x197816_9C218800 7168912921823232 text/mark/.. text/markdown
+0x197816_B215E800 7168913290160128 text/plai/.. text/plain
+0x197816_C0E9C000 7168913538924544 text/rtf./.. text/rtf
+0x197816_CAF20800 7168913707239424 text/tabs/.. text/tab-separated-values
+0x197816_CE8B9000 7168913767632896 text/turt/.. text/turtle
+0x197816_D4AC0000 7168913870422016 text/uril/.. text/uri-list
+0x197816_E6082000 7168914161672192 text/xc../.. text/x-c
+0x197816_E7521000 7168914183294976 text/xjav/.. text/x-java-source
+0x197816_E7E58000 7168914192957440 text/xml./.. text/xml
+0x197816_E971A000 7168914218917888 text/xvcl/.. text/x-vcalendar
+0x197816_E971D000 7168914218930176 text/xvcr/.. text/x-vcard
+0x197816_FE887DA3 7168914572737955 text/~~~~/~~ text/*
+
+0x1B384F_1DE9D000 7661736826621952 vide/3gpp/.. video/3gpp
+0x1B384F_1DE9D072 7661736826622066 vide/3gpp/2. video/3gpp2
+0x1B384F_9EAA7000 7661738986729472 vide/mp4./.. video/mp4
+0x1B384F_9EB6D800 7661738987542528 vide/mpeg/.. video/mpeg
+0x1B384F_AA881000 7661739185803264 vide/ogg./.. video/ogg
+0x1B384F_BA681800 7661739452143616 vide/quic/.. video/quicktime
+0x1B384F_DA85B800 7661739990956032 vide/vmpu/.. video/vnd.mpegurl
+0x1B384F_DFBE9800 7661740078569472 vide/webm/.. video/webm
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