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#include "ruby.h"
#define _AUTO 0
#define _JIS 1
#define _EUC 2
#define _SJIS 3
#define _BINARY 4
#define _NOCONV 4
#define _UNKNOWN _AUTO
#undef getc
#undef ungetc
#define getc(f) (input_ctr<i_len?input[input_ctr++]:-1)
#define ungetc(c,f) input_ctr--
#undef putchar
#define putchar(c) rb_nkf_putchar(c)
#define INCSIZE 32
static int incsize;
static unsigned char *input, *output;
static int input_ctr, i_len;
static int output_ctr, o_len;
static VALUE dst;
static int
rb_nkf_putchar(c)
unsigned int c;
{
if (output_ctr >= o_len) {
o_len += incsize;
rb_str_cat(dst, 0, incsize);
output = RSTRING(dst)->ptr;
incsize *= 2;
}
output[output_ctr++] = c;
return c;
}
#define PERL_XS 1
#include "nkf1.7/nkf.c"
static VALUE
rb_nkf_kconv(obj, opt, src)
VALUE obj, opt, src;
{
char *opt_ptr, *opt_end;
volatile VALUE v;
reinit();
StringValue(opt);
opt_ptr = RSTRING(opt)->ptr;
opt_end = opt_ptr + RSTRING(opt)->len;
for (; opt_ptr < opt_end; opt_ptr++) {
if (*opt_ptr != '-') {
continue;
}
arguments(opt_ptr);
}
incsize = INCSIZE;
input_ctr = 0;
StringValue(src);
input = RSTRING(src)->ptr;
i_len = RSTRING(src)->len;
dst = rb_str_new(0, i_len*3 + 10);
v = dst;
output_ctr = 0;
output = RSTRING(dst)->ptr;
o_len = RSTRING(dst)->len;
*output = '\0';
if(iso8859_f && (oconv != j_oconv || !x0201_f )) {
iso8859_f = FALSE;
}
kanji_convert(NULL);
RSTRING(dst)->ptr[output_ctr] = '\0';
RSTRING(dst)->len = output_ctr;
OBJ_INFECT(dst, src);
return dst;
}
/*
* Character code detection - Algorithm described in:
* Ken Lunde. `Understanding Japanese Information Processing'
* Sebastopol, CA: O'Reilly & Associates.
*/
static VALUE
rb_nkf_guess(obj, src)
VALUE obj, src;
{
unsigned char *p;
unsigned char *pend;
int sequence_counter = 0;
StringValue(src);
p = RSTRING(src)->ptr;
pend = p + RSTRING(src)->len;
#define INCR do {\
p++;\
if (p==pend) return INT2FIX(_UNKNOWN);\
sequence_counter++;\
if (sequence_counter % 2 == 1 && *p != 0xa4)\
sequence_counter = 0;\
if (6 <= sequence_counter) {\
sequence_counter = 0;\
return INT2FIX(_EUC);\
}\
} while (0)
if (*p == 0xa4)
sequence_counter = 1;
while (p<pend) {
if (*p == '\033') {
return INT2FIX(_JIS);
}
if (*p < '\006' || *p == 0x7f || *p == 0xff) {
return INT2FIX(_BINARY);
}
if (0x81 <= *p && *p <= 0x8d) {
return INT2FIX(_SJIS);
}
if (0x8f <= *p && *p <= 0x9f) {
return INT2FIX(_SJIS);
}
if (*p == 0x8e) { /* SS2 */
INCR;
if ((0x40 <= *p && *p <= 0x7e) ||
(0x80 <= *p && *p <= 0xa0) ||
(0xe0 <= *p && *p <= 0xfc))
return INT2FIX(_SJIS);
}
else if (0xa1 <= *p && *p <= 0xdf) {
INCR;
if (0xf0 <= *p && *p <= 0xfe)
return INT2FIX(_EUC);
if (0xe0 <= *p && *p <= 0xef) {
while (p < pend && *p >= 0x40) {
if (*p >= 0x81) {
if (*p <= 0x8d || (0x8f <= *p && *p <= 0x9f)) {
return INT2FIX(_SJIS);
}
else if (0xfd <= *p && *p <= 0xfe) {
return INT2FIX(_EUC);
}
}
INCR;
}
}
else if (*p <= 0x9f) {
return INT2FIX(_SJIS);
}
}
else if (0xf0 <= *p && *p <= 0xfe) {
return INT2FIX(_EUC);
}
else if (0xe0 <= *p && *p <= 0xef) {
INCR;
if ((0x40 <= *p && *p <= 0x7e) ||
(0x80 <= *p && *p <= 0xa0)) {
return INT2FIX(_SJIS);
}
if (0xfd <= *p && *p <= 0xfe) {
return INT2FIX(_EUC);
}
}
INCR;
}
return INT2FIX(_UNKNOWN);
}
void
Init_nkf()
{
VALUE mKconv = rb_define_module("NKF");
rb_define_module_function(mKconv, "nkf", rb_nkf_kconv, 2);
rb_define_module_function(mKconv, "guess", rb_nkf_guess, 1);
rb_define_const(mKconv, "AUTO", INT2FIX(_AUTO));
rb_define_const(mKconv, "JIS", INT2FIX(_JIS));
rb_define_const(mKconv, "EUC", INT2FIX(_EUC));
rb_define_const(mKconv, "SJIS", INT2FIX(_SJIS));
rb_define_const(mKconv, "BINARY", INT2FIX(_BINARY));
rb_define_const(mKconv, "NOCONV", INT2FIX(_NOCONV));
rb_define_const(mKconv, "UNKNOWN", INT2FIX(_UNKNOWN));
}
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