Class: Array

Inherits:
Object
  • Object
show all
Defined in:
(unknown)

Instance Method Summary collapse

Instance Method Details

#bencode ⇒ Object

Array#bencode



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# File 'ext/b_encode/b_encode.c', line 82

static VALUE
rb_ary_bencode(VALUE ary) {
    long len = RARRAY_LEN(ary);
    VALUE b_entries[len];

    int total_len = 0;
    ID bencode_method_sym = rb_intern("bencode");
    for (int i = 0; i < len; i++) {
        VALUE val      = rb_ary_entry(ary, i);
        VALUE bencoded = rb_funcall(val, bencode_method_sym, 0);
        total_len      += RSTRING_LEN(bencoded);
        b_entries[i]   = bencoded;
    }

    // "l"<contents>"e"
    VALUE str = rb_str_new(NULL, total_len + 2);
    char *ptr = RSTRING_PTR(str);

    ptr[0] = 'l';
    
    int offset = 1;
    for (int i = 0; i < len; i++) {
        VALUE entry = b_entries[i];
        int e_len   = RSTRING_LEN(entry);
        memcpy(ptr + offset, RSTRING_PTR(entry), e_len);
        offset += e_len;
    }
    
    ptr[total_len + 1] = 'e';

    return str;
}