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  1. #include <stdio.h>
  2. #include <stdint.h>
  3.  
  4. // Helper function to print binary representation
  5. void print_binary(uint16_t value, int bits) {
  6.     for (int i = bits - 1; i >= 0; i--) {
  7.         printf("%c", (value & (1 << i)) ? '1' : '0'); // Print '1' if bit is set, otherwise '0'
  8.     }
  9. }
  10.  
  11. // Simulate reading bits in big-endian order
  12. uint32_t read_bits(uint16_t *bit_buffer, int *bits_left, int num_bits) {
  13.     printf("bit_buffer: 0b");
  14.     print_binary(*bit_buffer, 16); // Print 16 bits
  15.     printf("\n");
  16.     uint32_t value = *bit_buffer >> (*bits_left - num_bits); // Extract the top `num_bits` bits
  17.     *bits_left -= num_bits;                                // Reduce the count of available bits
  18.     *bit_buffer &= (1 << *bits_left) - 1;                  // Clear the extracted bits
  19.     return value;                                          // Return the extracted value
  20. }
  21.  
  22. int main() {
  23.     uint16_t bit_buffer = 0b1101011011110010; // Example big-endian buffer
  24.     int bits_left = 16; // Total number of bits available in the buffer
  25.  
  26.     printf("Initial bit_buffer: 0b");
  27.     print_binary(bit_buffer, 16); // Print 16 bits
  28.     printf("\n");
  29.  
  30.     // Read 5 bits
  31.     int num_bits = 5;
  32.     uint32_t result = read_bits(&bit_buffer, &bits_left, num_bits);
  33.     printf("Read %d bits: 0b", num_bits);
  34.     print_binary(result, num_bits); // Print 5 bits
  35.     printf("\n");
  36.     printf("Remaining bit_buffer: 0b");
  37.     print_binary(bit_buffer, bits_left); // Print remaining bits
  38.     printf(", bits_left: %d\n", bits_left);
  39.  
  40.     // Read another 6 bits
  41.     num_bits = 6;
  42.     result = read_bits(&bit_buffer, &bits_left, num_bits);
  43.     printf("Read %d bits: 0b", num_bits);
  44.     print_binary(result, num_bits); // Print 6 bits
  45.     printf("\n");
  46.     printf("Remaining bit_buffer: 0b");
  47.     print_binary(bit_buffer, bits_left); // Print remaining bits
  48.     printf(", bits_left: %d\n", bits_left);
  49.  
  50.     // Read the remaining 5 bits
  51.     num_bits = 5;
  52.     result = read_bits(&bit_buffer, &bits_left, num_bits);
  53.     printf("Read %d bits: 0b", num_bits);
  54.     print_binary(result, num_bits); // Print 5 bits
  55.     printf("\n");
  56.     printf("Remaining bit_buffer: 0b");
  57.     print_binary(bit_buffer, bits_left); // Print remaining bits
  58.     printf(", bits_left: %d\n", bits_left);
  59.  
  60.     return 0;
  61. }
  62.  
  63.  
  64.  
Success #stdin #stdout 0.01s 5284KB
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stdin
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stdout
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Initial bit_buffer: 0b1101011011110010
bit_buffer: 0b1101011011110010
Read 5 bits: 0b11010
Remaining bit_buffer: 0b11011110010, bits_left: 11
bit_buffer: 0b0000011011110010
Read 6 bits: 0b110111
Remaining bit_buffer: 0b10010, bits_left: 5
bit_buffer: 0b0000000000010010
Read 5 bits: 0b10010
Remaining bit_buffer: 0b, bits_left: 0
https://ideone.com/mMjm8y
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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