factor/vm/byte_arrays.cpp

#include "master.hpp"

namespace factor {

/* Allocates memory */
byte_array* factor_vm::allot_byte_array(cell size) {
  byte_array* array = allot_uninitialized_array<byte_array>(size);
  memset(array + 1, 0, size);
  return array;
}

/* Allocates memory */
void factor_vm::primitive_byte_array() {
  cell size = unbox_array_size();
  ctx->push(tag<byte_array>(allot_byte_array(size)));
}

/* Allocates memory */
void factor_vm::primitive_uninitialized_byte_array() {
  cell size = unbox_array_size();
  ctx->push(tag<byte_array>(allot_uninitialized_array<byte_array>(size)));
}

/* Allocates memory */
void factor_vm::primitive_resize_byte_array() {
  data_root<byte_array> array(ctx->pop(), this);
  array.untag_check(this);
  cell capacity = unbox_array_size();
  ctx->push(tag<byte_array>(reallot_array(array.untagged(), capacity)));
}

/* Allocates memory */
void growable_byte_array::grow_bytes(cell len) {
  count += len;
  if (count >= array_capacity(elements.untagged()))
    elements = elements.parent->reallot_array(elements.untagged(), count * 2);
}

/* Allocates memory */
void growable_byte_array::append_bytes(void* elts, cell len) {
  cell old_count = count;
  grow_bytes(len);
  memcpy(&elements->data<uint8_t>()[old_count], elts, len);
}

/* Allocates memory */
void growable_byte_array::append_byte_array(cell byte_array_) {
  data_root<byte_array> byte_array(byte_array_, elements.parent);

  cell len = array_capacity(byte_array.untagged());
  cell new_size = count + len;
  factor_vm* parent = elements.parent;
  if (new_size >= array_capacity(elements.untagged()))
    elements = parent->reallot_array(elements.untagged(), new_size * 2);

  memcpy(&elements->data<uint8_t>()[count], byte_array->data<uint8_t>(), len);

  count += len;
}

/* Allocates memory */
void growable_byte_array::trim() {
  factor_vm* parent = elements.parent;
  elements = parent->reallot_array(elements.untagged(), count);
}

}