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Our previous code for GB18030 <-> UTF8 conversion only covered Unicode code points up to U+FFFF, but the actual spec defines conversions for all code points up to U+10FFFF. That would be rather impractical as a lookup table, but fortunately there is a simple algorithmic conversion between the additional code points and the equivalent GB18030 byte patterns. Make use of the just-added callback facility in LocalToUtf/UtfToLocal to perform the additional conversions. Having created the infrastructure to do that, we can use the same code to map certain linearly-related subranges of the Unicode space below U+FFFF, allowing removal of the corresponding lookup table entries. This more than halves the lookup table size, which is a substantial savings; utf8_and_gb18030.so drops from nearly a megabyte to about half that. In support of doing that, replace ISO10646-GB18030.TXT with the data file gb-18030-2000.xml (retrieved from http://source.icu-project.org/repos/icu/data/trunk/charset/data/xml/ ) in which these subranges have been deleted from the simple lookup entries. Per bug #12845 from Arjen Nienhuis. The conversion code added here is based on his proposed patch, though I whacked it around rather heavily. |
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