Move default MimeMap implementation to frameworks.

This is the second attempt to submit this CL. The first attempt
regressed on app startup because RuntimeInit installed the
custom MimeMap from commonInit() which runs post-fork of the zygote,
but that was fixed by installing it pre-fork.

This CL topic moves the default MimeMap implementation to frameworks.
Libcore starts with a minimal implementation sufficient to pass
CtsLibcoreTestCases,  but frameworks can inject the real implementation.
Before this CL topic, the data files and logic (MimeMapImpl) were part of
core-*.jar on device; after this CL, they instead live in framework.jar.

Tests from MimeMapTest that check behavior of that default
implementation also move to a non-libcore CTS test.

Planned work for follow-up CL:
 1. Make CTS more opinionated, with a plan to assert that all of
    the default mappings are present. How exactly the expectated
    mapping will be bundled in CTS is still TBD.
 2. Add a vendor.mime.types file (defaults to empty) where vendors
    can add additional mappings; I plan to make it such that mappings
    in that file are parsed last but never override any earlier
    mappings, as if each mime type / file extension was prefixed
    with '?'.
 3. Perhaps enforce that public APIs android.webkit.MimeTypeMap
    and java.net.URLConnection.getFileNameMap() behave consistently
    with MimeMap.getDefault().

Test: atest CtsLibcoreTestCases
Test: atest CtsMimeMapTestCases
Test: Checked that CtsLibcoreTestCases still passes on a build that
      is missing the MimeMap.setDefault() call from RuntimeInit.java.
Test: Checked that app startup time does not regress as part of this
      CL topic - see http://b/136256059#comment17
Bug: 136256059

Change-Id: I716914bf1a7e6205e539f0551f010615dacb17a8

1 files changed, 146 insertions, 0 deletions

diff --git a/mime/java-res/android.mime.types b/mime/java-res/android.mime.types
new file mode 100644
index 000000000000..1ca912e8510b
--- /dev/null
+++ b/mime/java-res/android.mime.types
@@ -0,0 +1,146 @@
+
+###############################################################################
+#
+# Android-specific MIME type <-> extension mappings
+#
+# Each line below defines an mapping from one MIME type to the first of the
+# listed extensions, and from listed extension back to the MIME type.
+# A mapping overrides any previous mapping _from_ that same MIME type or
+# extension (put() semantics), unless that MIME type / extension is prefixed with '?'
+# (putIfAbsent() semantics).
+#
+#
+###############################################################################
+#
+# EXAMPLES
+#
+# A line of the form:
+#
+#    ?mime ext1 ?ext2 ext3
+#
+# affects the current mappings along the lines of the following pseudo code:
+#
+#    mimeToExt.putIfAbsent("mime", "ext1");
+#    extToMime.put("ext1", "mime");
+#    extToMime.putIfAbsent("ext2", "mime");
+#    extToMime.put("ext3", "mime");
+#
+# The line:
+#
+#     ?text/plain txt
+#
+# leaves any earlier mapping for "text/plain" untouched, or maps that MIME type
+# to the file extension ".txt" if there is no earlier mapping. The line also
+# sets the mapping from file extension ".txt" to be the MIME type "text/plain",
+# regardless of whether a previous mapping existed.
+#
+###############################################################################
+
+
+# File extensions that Android wants to override to point to the given MIME type.
+#
+# After processing a line of the form:
+# ?<mimeType> <extension1> <extension2>
+# If <mimeType> was not already mapped to an extension then it will be
+# mapped to <extension1>.
+# <extension1> and <extension2> are mapped (or remapped) to <mimeType>.
+
+?application/epub+zip epub
+?application/pkix-cert cer
+?application/rss+xml rss
+?application/vnd.android.ota ota
+?application/vnd.apple.mpegurl m3u8
+?application/vnd.ms-pki.stl stl
+?application/vnd.ms-powerpoint pot
+?application/vnd.ms-wpl wpl
+?application/vnd.stardivision.impress sdp
+?application/vnd.stardivision.writer vor
+?application/vnd.youtube.yt yt
+?application/x-android-drm-fl fl
+?application/x-flac flac
+?application/x-font pcf
+?application/x-mpegurl m3u m3u8
+?application/x-pem-file pem
+?application/x-pkcs12 p12 pfx
+?application/x-webarchive webarchive
+?application/x-webarchive-xml webarchivexml
+?application/x-x509-server-cert crt
+?application/x-x509-user-cert crt
+
+?audio/3gpp 3gpp
+?audio/aac-adts aac
+?audio/imelody imy
+?audio/midi rtttl xmf
+?audio/mobile-xmf mxmf
+?audio/mp4 m4a
+?audio/mpegurl m3u
+?audio/sp-midi smf
+?audio/x-matroska mka
+?audio/x-pn-realaudio ra
+
+?image/bmp bmp
+?image/heic heic
+?image/heic-sequence heics
+?image/heif heif hif
+?image/heif-sequence heifs
+?image/ico cur
+?image/webp webp
+?image/x-adobe-dng dng
+?image/x-fuji-raf raf
+?image/x-icon ico
+?image/x-nikon-nrw nrw
+?image/x-panasonic-rw2 rw2
+?image/x-pentax-pef pef
+?image/x-samsung-srw srw
+?image/x-sony-arw arw
+
+?text/comma-separated-values csv
+?text/plain diff po
+?text/rtf rtf
+?text/text phps
+?text/xml xml
+?text/x-vcard vcf
+
+?video/3gpp2 3gpp2 3g2
+?video/3gpp 3gpp
+?video/avi avi
+?video/m4v m4v
+?video/mp2p mpeg
+?video/mp2t m2ts mts
+?video/mp2ts ts
+?video/vnd.youtube.yt yt
+?video/x-webex wrf
+
+# Optional additions that should not override any previous mapping.
+
+?application/x-wifi-config ?xml
+
+# Special cases where Android has a strong opinion about mappings, so we
+# define them very last and make them override in both directions (no "?").
+#
+# Lines here are of the form:
+# <mimeType> <extension1> <extension2> ...
+#
+# After processing each line,
+#   <mimeType> is mapped to <extension1>
+#   <extension1>, <extension2>, ... are all mapped to <mimeType>
+# This overrides any mappings for this <mimeType> / for these extensions
+# that may have been defined earlier.
+
+application/pgp-signature pgp
+application/x-x509-ca-cert crt
+audio/aac aac
+audio/basic snd
+audio/flac flac
+audio/midi rtx
+audio/mpeg mp3 m4a m4r
+audio/x-mpegurl m3u m3u8
+image/jpeg jpg
+image/x-ms-bmp bmp
+text/plain txt
+text/x-c++hdr hpp
+text/x-c++src cpp
+video/3gpp 3gpp
+video/mpeg mpeg
+video/quicktime mov
+video/x-matroska mkv