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#pike __REAL_VERSION__ 
#pragma strict_types 
 
//! Various Abstract Data Types. 
 
#if constant(_ADT) 
inherit _ADT; 
#endif /* _ADT */ 
 
constant List = __builtin.List; 
 
#if constant(__builtin.Stack) 
constant LowLevelStack = __builtin.Stack; 
#endif 
 
// Internal stuff for ADT.Struct 
protected int item_counter; 
int get_item_id() { return item_counter++; } 
 
protected class structError 
{ 
  inherit Error.Generic; 
  constant ADT_struct = 1; 
} 
 
//! String buffer with the possibility to read and write data 
//! as they would be formatted in structs. 
//! 
//! @deprecated Stdio.Buffer 
class struct { 
  inherit Stdio.Buffer; 
 
  //! Create a new buffer, optionally initialized with the 
  //! value @[s]. 
  __deprecated__ void create(void|string(0..255) s) 
  { 
     if( s && strlen(s) ) 
         ::create(s); 
     else 
         ::create(); 
     set_error_mode(structError); 
  } 
 
  //! Trims the buffer to only contain the data after the 
  //! read pointer and returns the contents of the buffer. 
  string(0..255) contents() 
  { 
      return (string(8bit))this; 
  } 
 
  //! Adds the data @[s] verbatim to the end of the buffer. 
  this_program add_data(string(0..255) s) 
  { 
      return [object(this_program)]add(s); 
  } 
 
  //! Return all the data in the buffer and empties it. 
  string(0..255) pop_data() 
  { 
    return read(); 
  } 
 
  //! Appends an unsigned integer in network order to the buffer. 
  //! 
  //!  @param i 
  //!    Unsigned integer to append. 
  //!  @param len 
  //!    Length of integer in bytes. 
  this_program put_uint(int i, int(0..) len) 
  { 
    return [object(this_program)]add_int(i,len); 
  } 
 
  //! Appends a variable stringĀ @[s] preceded with an unsigned integer 
  //! of the size @[len_width] declaring the length of the string. The 
  //! string @[s] should be 8 bits wide. 
  this_program put_var_string(string(0..255) s, int(0..) len_width) 
  { 
    return [object(this_program)]add_hstring(s,len_width); 
  } 
 
  //! Appends a bignum @[i] as a variable string preceded with an 
  //! unsigned integer of the size @[len_width] declaring the length 
  //! of the string. @[len_width] defaults to 2. 
  this_program put_bignum(Gmp.mpz i, int(0..)|void len_width) 
  { 
    return [object(this_program)]add_hstring(i->digits(256),len_width||2); 
  } 
 
  //! Appends the fix sized string @[s] to the buffer. 
  this_program put_fix_string(string(0..255) s) 
  { 
    return [object(this_program)]add(s); 
  } 
 
  //! Appends an array of unsigned integers of width @[item_size] 
  //! to the buffer. 
  this_program put_fix_uint_array(array(int) data, int(0..) item_size) 
  { 
    return [object(this_program)]add_ints(data,item_size); 
  } 
 
  //! Appends an array of unsigned integers of width @[item_size] 
  //! to the buffer, preceded with an unsigned integer @[len] declaring 
  //! the size of the array in bytes. 
  this_program put_var_uint_array(array(int) data, int(0..) item_size, int(0..) len) 
  { 
    add_int(sizeof(data)*item_size, len ); 
    return [object(this_program)]add_ints(data,item_size); 
  } 
 
  //! Appends an array of variable length strings with @[item_size] 
  //! bytes hollerith coding, prefixed by a @[len] bytes large integer 
  //! declaring the total size of the array in bytes. 
  this_program put_var_string_array(array(string(8bit)) data, int(0..) item_size, int(0..) len) 
  { 
    Stdio.Buffer sub = Stdio.Buffer(); 
    foreach(data, string(8bit) s) 
      sub->add_hstring(s, item_size); 
    add_int(sizeof(sub),len); 
    return [object(this_program)]add(sub); 
  } 
 
  //! Reads an unsigned integer from the buffer. 
  int(0..) get_uint(int len) 
  { 
    return read_int(len); 
  } 
 
  //! Reads a fixed sized string of length @[len] from the buffer. 
  string(0..255) get_fix_string(int len) 
  { 
     return read(len); 
  } 
 
  //! Reads a string written by @[put_var_string] from the buffer. 
  string(0..255) get_var_string(int len) 
  { 
     return read_hstring(len); 
  } 
 
  //! Reads a bignum written by @[put_bignum] from the buffer. 
  Gmp.mpz get_bignum(int|void len) 
  { 
      return Gmp.mpz(read_hstring(len||2),256); 
  } 
 
  //! Get the remaining data from the buffer and clears the buffer. 
  string(0..255) get_rest() 
  { 
    return read(); 
  } 
 
  //! Reads an array of integers as written by @[put_fix_uint_array] 
  //! from the buffer. 
  array(int) get_fix_uint_array(int item_size, int size) 
  { 
    return read_ints(size, item_size); 
  } 
 
  //! Reads an array of integers as written by @[put_var_uint_array] 
  //! from the buffer. 
  array(int) get_var_uint_array(int item_size, int len) 
  { 
    int size = read_int(len); 
    int elems = size/item_size; 
    if( elems*item_size != size ) 
      throw(structError("Impossible uint array length value.\n")); 
    return read_ints(elems, item_size); 
  } 
 
  //! Returns one if there is any more data to read. 
  int(0..1) is_empty() 
  { 
    return !sizeof(this); 
  } 
}