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#include "internal.h"
static VALUE
rb_integer_pack_raw_m(VALUE val, VALUE buf, VALUE numwords_arg, VALUE wordsize_arg, VALUE nails, VALUE flags)
{
int sign;
size_t numwords = 0;
size_t wordsize = NUM2SIZET(wordsize_arg);
StringValue(buf);
rb_str_modify(buf);
sign = rb_integer_pack(val,
RSTRING_PTR(buf), NUM2SIZET(numwords_arg),
NUM2SIZET(wordsize_arg), NUM2SIZET(nails), NUM2INT(flags));
return rb_ary_new_from_args(2, INT2NUM(sign), rb_str_new(RSTRING_PTR(buf), wordsize * numwords));
}
static VALUE
rb_integer_pack_m(VALUE val, VALUE numwords_arg, VALUE wordsize_arg, VALUE nails, VALUE flags)
{
int sign;
size_t numwords = NUM2SIZET(numwords_arg);
size_t wordsize = NUM2SIZET(wordsize_arg);
VALUE buf;
if (numwords != 0 && wordsize != 0 && LONG_MAX / wordsize < numwords)
rb_raise(rb_eArgError, "too big numwords * wordsize");
buf = rb_str_new(NULL, numwords * wordsize);
sign = rb_integer_pack(val,
RSTRING_PTR(buf), numwords,
wordsize, NUM2SIZET(nails), NUM2INT(flags));
return rb_assoc_new(INT2NUM(sign), buf);
}
static VALUE
rb_integer_unpack_m(VALUE klass, VALUE buf, VALUE numwords, VALUE wordsize, VALUE nails, VALUE flags)
{
StringValue(buf);
return rb_integer_unpack(RSTRING_PTR(buf),
NUM2SIZET(numwords), NUM2SIZET(wordsize),
NUM2SIZET(nails), NUM2INT(flags));
}
static VALUE
rb_integer_test_numbits_2comp_without_sign(VALUE val)
{
size_t size;
int neg = FIXNUM_P(val) ? FIX2LONG(val) < 0 : BIGNUM_NEGATIVE_P(val);
size = rb_absint_numwords(val, 1, NULL) - (neg && rb_absint_singlebit_p(val));
return SIZET2NUM(size);
}
static VALUE
rb_integer_test_numbytes_2comp_with_sign(VALUE val)
{
int neg = FIXNUM_P(val) ? FIX2LONG(val) < 0 : BIGNUM_NEGATIVE_P(val);
int nlz_bits;
size_t size = rb_absint_size(val, &nlz_bits);
if (nlz_bits == 0 && !(neg && rb_absint_singlebit_p(val)))
size++;
return SIZET2NUM(size);
}
void
Init_intpack(VALUE klass)
{
rb_define_method(rb_cInteger, "test_pack_raw", rb_integer_pack_raw_m, 5);
rb_define_method(rb_cInteger, "test_pack", rb_integer_pack_m, 4);
rb_define_singleton_method(rb_cInteger, "test_unpack", rb_integer_unpack_m, 5);
rb_define_const(rb_cInteger, "INTEGER_PACK_MSWORD_FIRST", INT2NUM(INTEGER_PACK_MSWORD_FIRST));
rb_define_const(rb_cInteger, "INTEGER_PACK_LSWORD_FIRST", INT2NUM(INTEGER_PACK_LSWORD_FIRST));
rb_define_const(rb_cInteger, "INTEGER_PACK_MSBYTE_FIRST", INT2NUM(INTEGER_PACK_MSBYTE_FIRST));
rb_define_const(rb_cInteger, "INTEGER_PACK_LSBYTE_FIRST", INT2NUM(INTEGER_PACK_LSBYTE_FIRST));
rb_define_const(rb_cInteger, "INTEGER_PACK_NATIVE_BYTE_ORDER", INT2NUM(INTEGER_PACK_NATIVE_BYTE_ORDER));
rb_define_const(rb_cInteger, "INTEGER_PACK_2COMP", INT2NUM(INTEGER_PACK_2COMP));
rb_define_const(rb_cInteger, "INTEGER_PACK_LITTLE_ENDIAN", INT2NUM(INTEGER_PACK_LITTLE_ENDIAN));
rb_define_const(rb_cInteger, "INTEGER_PACK_BIG_ENDIAN", INT2NUM(INTEGER_PACK_BIG_ENDIAN));
rb_define_const(rb_cInteger, "INTEGER_PACK_FORCE_BIGNUM", INT2NUM(INTEGER_PACK_FORCE_BIGNUM));
rb_define_const(rb_cInteger, "INTEGER_PACK_NEGATIVE", INT2NUM(INTEGER_PACK_NEGATIVE));
rb_define_const(rb_cInteger, "INTEGER_PACK_FORCE_GENERIC_IMPLEMENTATION", INT2NUM(INTEGER_PACK_FORCE_GENERIC_IMPLEMENTATION));
rb_define_method(rb_cInteger, "test_numbits_2comp_without_sign", rb_integer_test_numbits_2comp_without_sign, 0);
rb_define_method(rb_cInteger, "test_numbytes_2comp_with_sign", rb_integer_test_numbytes_2comp_with_sign, 0);
}
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