I'm trying to implement LEB128 to write a custom Minecraft Server implemention. I'm doing so by following Wikipedia article about LEB128 and port example Javascript code given to C. https://en.wikipedia.org/wiki/LEB128
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int leb128(const char* in) {
int result = 0;
int shift_counter = 0;
size_t s = strlen(in);
int data = atoi(in);
for(unsigned char i = 0; i < s; i++) {
const char byte = ((unsigned char*)&data)[i];
result |= (byte & 0x7f) << i * 7;
shift_counter += 7;
if(!(byte & 0x80)) break;
if((shift_counter < 32 && (byte & 0x40)) != 0) return result |= (~0 << shift_counter);
}
return result;
}
/* this actually prints bytes makes the int but lazily named it because I renamed every function i took from my og project to avoid revealing the name */
void printInt(int a) {
int* e = &a;
puts("\n");
for(unsigned i = 0; i < sizeof(int); i++) {
printf(" %d ", ((unsigned char*)e)[i]);
}
}
int main(void) {
printInt(leb128("-1"));
printInt(leb128("255"));
printInt(leb128("25565"));
return 0;
}
problem is that I do not receive data in given example table located at https://wiki.vg/Protocol
| Input | Expected | Output |
|---|---|---|
| -1 | 255 255 255 15 | 255 255 255 255 |
| 255 | 255 1 | 255 255 255 255 |
| 25565 | 221 199 1 | 221 255 255 255 |
What could be I'm doing wrong?
