Tons of Solutions Engineering work done today for the rest of the CS team! Headway, Howard Hanna, Engels, Brighton, etc. Also completed Datasnippers auth flow and worked on Anthology's script. Cloned Anthology's courses (900..) and will clone Full Story on Monday.

This commit is contained in:
Norm Rasmussen
2024-01-05 17:07:59 -05:00
parent ce261975ca
commit a5fe4bd2c8
3157 changed files with 554269 additions and 16 deletions

View File

@ -0,0 +1,39 @@
var BITMASK = [0, 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F, 0x7F, 0xFF];
// returns a function that reads bits.
// takes a buffer iterator as input
module.exports = function bitIterator(nextBuffer) {
var bit = 0, byte = 0;
var bytes = nextBuffer();
var f = function(n) {
if (n === null && bit != 0) { // align to byte boundary
bit = 0
byte++;
return;
}
var result = 0;
while(n > 0) {
if (byte >= bytes.length) {
byte = 0;
bytes = nextBuffer();
}
var left = 8 - bit;
if (bit === 0 && n > 0)
f.bytesRead++;
if (n >= left) {
result <<= left;
result |= (BITMASK[left] & bytes[byte++]);
bit = 0;
n -= left;
} else {
result <<= n;
result |= ((bytes[byte] & (BITMASK[n] << (8 - n - bit))) >> (8 - n - bit));
bit += n;
n = 0;
}
}
return result;
};
f.bytesRead = 0;
return f;
};