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https://github.com/MarginaliaSearch/MarginaliaSearch.git
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1d34224416
Look, this will make the git history look funny, but trimming unnecessary depth from the source tree is a very necessary sanity-preserving measure when dealing with a super-modularized codebase like this one. While it makes the project configuration a bit less conventional, it will save you several clicks every time you jump between modules. Which you'll do a lot, because it's *modul*ar. The src/main/java convention makes a lot of sense for a non-modular project though. This ain't that.
55 lines
1.5 KiB
Java
55 lines
1.5 KiB
Java
package nu.marginalia.bbpc;
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public class BrailleBlockPunchCards {
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private static final char brailleBlockBase = '\u2800';
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public static String printBits(long val, int bits) {
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StringBuilder builder = new StringBuilder();
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for (int b = 0; b < bits; b+=8, val>>>=8) {
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builder.append((char)(brailleBlockBase + bin2brail(val)));
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}
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return builder.toString();
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}
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/* The braille block in unicode U2800 is neat because it contains
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* 8 "bits", but for historical reasons, they're addressed in a bit
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* of an awkward way. Braille used to be a 2x6 grid, but it was extended
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* to 2x8.
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* It's addressed as follows
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*
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* 0 3
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* 1 4
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* 2 5
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* 6 7 <-- extended braille
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*
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*
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* We want to use it as a dot matrix to represent bits. To do that we need
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* to do this transformation:
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*
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* 0 1 2 3 4 5 6 7 native order bits
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* | | | \ _\__\/ |
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* | | | / \ \ \ |
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* 0 1 2 6 3 4 5 7 braille order bits
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*
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* 01 02 04 08 10 20 40 80
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* 01+02+04 +80 : &0x87
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* << 10+20+40 : &0x70, <<1
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* 08 >> >> >> : &0x08, >>3
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*
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* Or in other words we do
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* (v & 0x87)
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* | ((v & 0x70) >> 1)
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* | ((v & 0x08) << 3)
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*
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* Thanks for coming to my TED talk.
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*/
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private static char bin2brail(long v) {
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return (char)((v & 0x87) | ((v & 0x70) >> 1) | ((v & 0x08) << 3));
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}
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}
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