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/**********************************************************************

encoding.c -

$Author$
created at: Thu May 24 17:23:27 JST 2007

Copyright (C) 2007 Yukihiro Matsumoto

**********************************************************************/

#include "ruby/ruby.h"
#include "ruby/encoding.h"
#include "regenc.h"
#include <ctype.h>
#ifndef NO_LOCALE_CHARMAP
#ifdef __CYGWIN__
#include <windows.h>
#endif
#ifdef HAVE_LANGINFO_H
#include <langinfo.h>
#endif
#endif
#include "ruby/util.h"

static ID id_encoding;
VALUE rb_cEncoding;
static VALUE rb_encoding_list;

struct rb_encoding_entry {
    const char *name;
    rb_encoding *enc;
    rb_encoding *base;
};

static struct {
    struct rb_encoding_entry *list;
    int count;
    int size;
    st_table *names;
} enc_table;

void rb_enc_init(void);

#define ENCODING_COUNT ENCINDEX_BUILTIN_MAX
#define UNSPECIFIED_ENCODING INT_MAX

#define ENCODING_NAMELEN_MAX 63
#define valid_encoding_name_p(name) ((name) && strlen(name) <= ENCODING_NAMELEN_MAX)

#define enc_autoload_p(enc) (!rb_enc_mbmaxlen(enc))

static int load_encoding(const char *name);

static size_t
enc_memsize(void *p)
{
    return 0;
}

static const rb_data_type_t encoding_data_type = {
    "encoding", 0, 0, enc_memsize,
};

#define is_data_encoding(obj) (RTYPEDDATA_P(obj) && RTYPEDDATA_TYPE(obj) == &encoding_data_type)

static VALUE
enc_new(rb_encoding *encoding)
{
    return TypedData_Wrap_Struct(rb_cEncoding, &encoding_data_type, encoding);
}

VALUE
rb_enc_from_encoding(rb_encoding *encoding)
{
    VALUE list, enc;
    int idx;

    if (!encoding) return Qnil;
    idx = ENC_TO_ENCINDEX(encoding);
    if (!(list = rb_encoding_list)) {
rb_bug("rb_enc_from_encoding(%d\"%s\"): no rb_encoding_list",
idx, rb_enc_name(encoding));
    }
    enc = rb_ary_entry(list, idx);
    if (NIL_P(enc)) {
rb_bug("rb_enc_from_encoding(%d\"%s\"): not created yet",
idx, rb_enc_name(encoding));
    }
    return enc;
}

static int enc_autoload(rb_encoding *);

static int
check_encoding(rb_encoding *enc)
{
    int index = rb_enc_to_index(enc);
    if (rb_enc_from_index(index) != enc)
return -1;
    if (enc_autoload_p(enc)) {
index = enc_autoload(enc);
    }
    return index;
}

static int
enc_check_encoding(VALUE obj)
{
    if (SPECIAL_CONST_P(obj) || !rb_typeddata_is_kind_of(obj, &encoding_data_type)) {
return -1;
    }
    return check_encoding(RDATA(obj)->data);
}

static int
must_encoding(VALUE enc)
{
    int index = enc_check_encoding(enc);
    if (index < 0) {
rb_raise(rb_eTypeError, "wrong argument type %s (expected Encoding)",
rb_obj_classname(enc));
    }
    return index;
}

int
rb_to_encoding_index(VALUE enc)
{
    int idx;

    idx = enc_check_encoding(enc);
    if (idx >= 0) {
return idx;
    }
    else if (NIL_P(enc = rb_check_string_type(enc))) {
return -1;
    }
    if (!rb_enc_asciicompat(rb_enc_get(enc))) {
return -1;
    }
    return rb_enc_find_index(StringValueCStr(enc));
}

static rb_encoding *
to_encoding(VALUE enc)
{
    int idx;

    StringValue(enc);
    if (!rb_enc_asciicompat(rb_enc_get(enc))) {
rb_raise(rb_eArgError, "invalid name encoding (non ASCII)");
    }
    idx = rb_enc_find_index(StringValueCStr(enc));
    if (idx < 0) {
rb_raise(rb_eArgError, "unknown encoding name - %s", RSTRING_PTR(enc));
    }
    return rb_enc_from_index(idx);
}

rb_encoding *
rb_to_encoding(VALUE enc)
{
    if (enc_check_encoding(enc) >= 0) return RDATA(enc)->data;
    return to_encoding(enc);
}

void
rb_gc_mark_encodings(void)
{
}

static int
enc_table_expand(int newsize)
{
    struct rb_encoding_entry *ent;
    int count = newsize;

    if (enc_table.size >= newsize) return newsize;
    newsize = (newsize + 7) / 8 * 8;
    ent = realloc(enc_table.list, sizeof(*enc_table.list) * newsize);
    if (!ent) return -1;
    memset(ent + enc_table.size, 0, sizeof(*ent)*(newsize - enc_table.size));
    enc_table.list = ent;
    enc_table.size = newsize;
    return count;
}

static int
enc_register_at(int index, const char *name, rb_encoding *encoding)
{
    struct rb_encoding_entry *ent = &enc_table.list[index];
    VALUE list;

    if (!valid_encoding_name_p(name)) return -1;
    if (!ent->name) {
ent->name = name = strdup(name);
    }
    else if (STRCASECMP(name, ent->name)) {
return -1;
    }
    if (!ent->enc) {
ent->enc = xmalloc(sizeof(rb_encoding));
    }
    if (encoding) {
*ent->enc = *encoding;
    }
    else {
memset(ent->enc, 0, sizeof(*ent->enc));
    }
    encoding = ent->enc;
    encoding->name = name;
    encoding->ruby_encoding_index = index;
    st_insert(enc_table.names, (st_data_t)name, (st_data_t)index);
    list = rb_encoding_list;
    if (list && NIL_P(rb_ary_entry(list, index))) {
/* initialize encoding data */
rb_ary_store(list, index, enc_new(encoding));
    }
    return index;
}

static int
enc_register(const char *name, rb_encoding *encoding)
{
    int index = enc_table.count;

    if ((index = enc_table_expand(index + 1)) < 0) return -1;
    enc_table.count = index;
    return enc_register_at(index - 1, name, encoding);
}

static void set_encoding_const(const char *, rb_encoding *);
int rb_enc_registered(const char *name);

int
rb_enc_register(const char *name, rb_encoding *encoding)
{
    int index = rb_enc_registered(name);

    if (index >= 0) {
rb_encoding *oldenc = rb_enc_from_index(index);
if (STRCASECMP(name, rb_enc_name(oldenc))) {
index = enc_register(name, encoding);
}
else if (enc_autoload_p(oldenc) || !ENC_DUMMY_P(oldenc)) {
enc_register_at(index, name, encoding);
}
else {
rb_raise(rb_eArgError, "encoding %s is already registered", name);
}
    }
    else {
index = enc_register(name, encoding);
set_encoding_const(name, rb_enc_from_index(index));
    }
    return index;
}

void
rb_encdb_declare(const char *name)
{
    int idx = rb_enc_registered(name);
    if (idx < 0) {
idx = enc_register(name, 0);
    }
    set_encoding_const(name, rb_enc_from_index(idx));
}

static void
enc_check_duplication(const char *name)
{
    if (rb_enc_registered(name) >= 0) {
rb_raise(rb_eArgError, "encoding %s is already registered", name);
    }
}

static rb_encoding*
set_base_encoding(int index, rb_encoding *base)
{
    rb_encoding *enc = enc_table.list[index].enc;

    enc_table.list[index].base = base;
    if (rb_enc_dummy_p(base)) ENC_SET_DUMMY(enc);
    return enc;
}

/* for encdb.h
* Set base encoding for encodings which are not replicas
* but not in their own files.
*/
void
rb_enc_set_base(const char *name, const char *orig)
{
    int idx = rb_enc_registered(name);
    int origidx = rb_enc_registered(orig);
    set_base_encoding(idx, rb_enc_from_index(origidx));
}

int
rb_enc_replicate(const char *name, rb_encoding *encoding)
{
    int idx;

    enc_check_duplication(name);
    idx = enc_register(name, encoding);
    set_base_encoding(idx, encoding);
    set_encoding_const(name, rb_enc_from_index(idx));
    return idx;
}

static int
enc_replicate(int idx, const char *name, rb_encoding *origenc)
{
    if (idx < 0) {
idx = enc_register(name, origenc);
    }
    else {
idx = enc_register_at(idx, name, origenc);
    }
    if (idx >= 0) {
set_base_encoding(idx, origenc);
set_encoding_const(name, rb_enc_from_index(idx));
    }
    return idx;
}

int
rb_encdb_replicate(const char *name, const char *orig)
{
    int origidx = rb_enc_registered(orig);
    int idx = rb_enc_registered(name);

    if (origidx < 0) {
origidx = enc_register(orig, 0);
    }
    return enc_replicate(idx, name, rb_enc_from_index(origidx));
}

int
rb_define_dummy_encoding(const char *name)
{
    int index = rb_enc_replicate(name, rb_ascii8bit_encoding());
    rb_encoding *enc = enc_table.list[index].enc;

    ENC_SET_DUMMY(enc);
    return index;
}

int
rb_encdb_dummy(const char *name)
{
    int index = enc_replicate(rb_enc_registered(name), name,
rb_ascii8bit_encoding());
    rb_encoding *enc = enc_table.list[index].enc;

    ENC_SET_DUMMY(enc);
    return index;
}

/*
* call-seq:
* enc.dummy? => true or false
*
* Returns true for dummy encodings.
* A dummy encoding is an encoding for which character handling is not properly
* implemented.
* It is used for stateful encodings.
*
* Encoding::ISO_2022_JP.dummy? #=> true
* Encoding::UTF_8.dummy? #=> false
*
*/
static VALUE
enc_dummy_p(VALUE enc)
{
    return ENC_DUMMY_P(enc_table.list[must_encoding(enc)].enc) ? Qtrue : Qfalse;
}

/*
* call-seq:
* enc.ascii_compatible? => true or false
*
* Returns whether ASCII-compatible or not.
*
* Encoding::UTF_8.ascii_compatible? #=> true
* Encoding::UTF_16BE.ascii_compatible? #=> false
*
*/
static VALUE
enc_ascii_compatible_p(VALUE enc)
{
    return rb_enc_asciicompat(enc_table.list[must_encoding(enc)].enc) ? Qtrue : Qfalse;
}

static const char *
enc_alias_internal(const char *alias, int idx)
{
    alias = strdup(alias);
    st_insert(enc_table.names, (st_data_t)alias, (st_data_t)idx);
    return alias;
}

static int
enc_alias(const char *alias, int idx)
{
    if (!valid_encoding_name_p(alias)) return -1;
    alias = enc_alias_internal(alias, idx);
    set_encoding_const(alias, rb_enc_from_index(idx));
    return idx;
}

int
rb_enc_alias(const char *alias, const char *orig)
{
    int idx;

    enc_check_duplication(alias);
    if (!enc_table.list) {
rb_enc_init();
    }
    if ((idx = rb_enc_find_index(orig)) < 0) {
return -1;
    }
    return enc_alias(alias, idx);
}

int
rb_encdb_alias(const char *alias, const char *orig)
{
    int idx = rb_enc_registered(orig);

    if (idx < 0) {
idx = enc_register(orig, 0);
    }
    return enc_alias(alias, idx);
}

enum {
    ENCINDEX_ASCII,
    ENCINDEX_UTF_8,
    ENCINDEX_US_ASCII,
    ENCINDEX_BUILTIN_MAX
};

extern rb_encoding OnigEncodingUTF_8;
extern rb_encoding OnigEncodingUS_ASCII;

void
rb_enc_init(void)
{
    enc_table_expand(ENCODING_COUNT + 1);
    if (!enc_table.names) {
enc_table.names = st_init_strcasetable();
    }
#define ENC_REGISTER(enc) enc_register_at(ENCINDEX_##enc, rb_enc_name(&OnigEncoding##enc), &OnigEncoding##enc)
    ENC_REGISTER(ASCII);
    ENC_REGISTER(UTF_8);
    ENC_REGISTER(US_ASCII);
#undef ENC_REGISTER
    enc_table.count = ENCINDEX_BUILTIN_MAX;
}

rb_encoding *
rb_enc_from_index(int index)
{
    if (!enc_table.list) {
rb_enc_init();
    }
    if (index < 0 || enc_table.count <= index) {
return 0;
    }
    return enc_table.list[index].enc;
}

int
rb_enc_registered(const char *name)
{
    st_data_t idx = 0;

    if (!name) return -1;
    if (!enc_table.list) return -1;
    if (st_lookup(enc_table.names, (st_data_t)name, &idx)) {
return (int)idx;
    }
    return -1;
}

static VALUE
require_enc(VALUE enclib)
{
    return rb_require_safe(enclib, rb_safe_level());
}

static int
load_encoding(const char *name)
{
    VALUE enclib = rb_sprintf("enc/%s.so", name);
    VALUE verbose = ruby_verbose;
    VALUE debug = ruby_debug;
    VALUE loaded;
    char *s = RSTRING_PTR(enclib) + 4, *e = RSTRING_END(enclib) - 3;
    int idx;

    while (s < e) {
if (!ISALNUM(*s)) *s = '_';
else if (ISUPPER(*s)) *s = TOLOWER(*s);
++s;
    }
    OBJ_FREEZE(enclib);
    ruby_verbose = Qfalse;
    ruby_debug = Qfalse;
    loaded = rb_protect(require_enc, enclib, 0);
    ruby_verbose = verbose;
    ruby_debug = debug;
    rb_set_errinfo(Qnil);
    if (NIL_P(loaded)) return -1;
    if ((idx = rb_enc_registered(name)) < 0) return -1;
    if (enc_autoload_p(enc_table.list[idx].enc)) return -1;
    return idx;
}

static int
enc_autoload(rb_encoding *enc)
{
    int i;
    rb_encoding *base = enc_table.list[ENC_TO_ENCINDEX(enc)].base;

    if (base) {
i = 0;
do {
if (i >= enc_table.count) return -1;
} while (enc_table.list[i].enc != base && (++i, 1));
if (enc_autoload_p(base)) {
if (enc_autoload(base) < 0) return -1;
}
i = ENC_TO_ENCINDEX(enc);
enc_register_at(i, rb_enc_name(enc), base);
    }
    else {
i = load_encoding(rb_enc_name(enc));
    }
    return i;
}

int
rb_enc_find_index(const char *name)
{
    int i = rb_enc_registered(name);
    rb_encoding *enc;

    if (i < 0) {
i = load_encoding(name);
    }
    else if (!(enc = rb_enc_from_index(i))) {
if (i != UNSPECIFIED_ENCODING) {
rb_raise(rb_eArgError, "encoding %s is not registered", name);
}
    }
    else if (enc_autoload_p(enc)) {
if (enc_autoload(enc) < 0) {
rb_warn("failed to load encoding (%s); use ASCII-8BIT instead",
name);
return 0;
}
    }
    return i;
}

rb_encoding *
rb_enc_find(const char *name)
{
    int idx = rb_enc_find_index(name);
    if (idx < 0) idx = 0;
    return rb_enc_from_index(idx);
}

static inline int
enc_capable(VALUE obj)
{
    if (SPECIAL_CONST_P(obj)) return SYMBOL_P(obj);
    switch (BUILTIN_TYPE(obj)) {
      case T_STRING:
      case T_REGEXP:
      case T_FILE:
return TRUE;
      case T_DATA:
if (is_data_encoding(obj)) return TRUE;
      default:
return FALSE;
    }
}

ID
rb_id_encoding(void)
{
    CONST_ID(id_encoding, "encoding");
    return id_encoding;
}

int
rb_enc_get_index(VALUE obj)
{
    int i = -1;
    VALUE tmp;

    if (SPECIAL_CONST_P(obj)) {
if (!SYMBOL_P(obj)) return -1;
obj = rb_id2str(SYM2ID(obj));
    }
    switch (BUILTIN_TYPE(obj)) {
      as_default:
      default:
      case T_STRING:
      case T_REGEXP:
i = ENCODING_GET_INLINED(obj);
if (i == ENCODING_INLINE_MAX) {
VALUE iv;

iv = rb_ivar_get(obj, rb_id_encoding());
i = NUM2INT(iv);
}
break;
      case T_FILE:
tmp = rb_funcall(obj, rb_intern("internal_encoding"), 0, 0);
if (NIL_P(tmp)) obj = rb_funcall(obj, rb_intern("external_encoding"), 0, 0);
else obj = tmp;
if (NIL_P(obj)) break;
      case T_DATA:
if (is_data_encoding(obj)) {
i = enc_check_encoding(obj);
}
else {
goto as_default;
}
break;
    }
    return i;
}

void
rb_enc_set_index(VALUE obj, int idx)
{
    if (idx < ENCODING_INLINE_MAX) {
ENCODING_SET_INLINED(obj, idx);
return;
    }
    ENCODING_SET_INLINED(obj, ENCODING_INLINE_MAX);
    rb_ivar_set(obj, rb_id_encoding(), INT2NUM(idx));
    return;
}

VALUE
rb_enc_associate_index(VALUE obj, int idx)
{
/* enc_check_capable(obj);*/
    if (rb_enc_get_index(obj) == idx)
     return obj;
    if (SPECIAL_CONST_P(obj)) {
rb_raise(rb_eArgError, "cannot set encoding");
    }
    if (!ENC_CODERANGE_ASCIIONLY(obj) ||
!rb_enc_asciicompat(rb_enc_from_index(idx))) {
ENC_CODERANGE_CLEAR(obj);
    }
    rb_enc_set_index(obj, idx);
    return obj;
}

VALUE
rb_enc_associate(VALUE obj, rb_encoding *enc)
{
    return rb_enc_associate_index(obj, rb_enc_to_index(enc));
}

rb_encoding*
rb_enc_get(VALUE obj)
{
    return rb_enc_from_index(rb_enc_get_index(obj));
}

rb_encoding*
rb_enc_check(VALUE str1, VALUE str2)
{
    rb_encoding *enc = rb_enc_compatible(str1, str2);
    if (!enc)
rb_raise(rb_eEncCompatError, "incompatible character encodings: %s and %s",
rb_enc_name(rb_enc_get(str1)),
rb_enc_name(rb_enc_get(str2)));
    return enc;
}

rb_encoding*
rb_enc_compatible(VALUE str1, VALUE str2)
{
    int idx1, idx2;
    rb_encoding *enc1, *enc2;

    idx1 = rb_enc_get_index(str1);
    idx2 = rb_enc_get_index(str2);

    if (idx1 < 0 || idx2 < 0)
        return 0;

    if (idx1 == idx2) {
return rb_enc_from_index(idx1);
    }
    enc1 = rb_enc_from_index(idx1);
    enc2 = rb_enc_from_index(idx2);

    if (TYPE(str2) == T_STRING && RSTRING_LEN(str2) == 0)
return (idx1 == ENCINDEX_US_ASCII && rb_enc_asciicompat(enc2)) ? enc2 : enc1;
    if (TYPE(str1) == T_STRING && RSTRING_LEN(str1) == 0)
return (idx2 == ENCINDEX_US_ASCII && rb_enc_asciicompat(enc1)) ? enc1 : enc2;
    if (!rb_enc_asciicompat(enc1) || !rb_enc_asciicompat(enc2)) {
return 0;
    }

    /* objects whose encoding is the same of contents */
    if (BUILTIN_TYPE(str2) != T_STRING && idx2 == ENCINDEX_US_ASCII)
return enc1;
    if (BUILTIN_TYPE(str1) != T_STRING && idx1 == ENCINDEX_US_ASCII)
return enc2;

    if (BUILTIN_TYPE(str1) != T_STRING) {
VALUE tmp = str1;
int idx0 = idx1;
str1 = str2;
str2 = tmp;
idx1 = idx2;
idx2 = idx0;
    }
    if (BUILTIN_TYPE(str1) == T_STRING) {
int cr1, cr2;

cr1 = rb_enc_str_coderange(str1);
if (BUILTIN_TYPE(str2) == T_STRING) {
cr2 = rb_enc_str_coderange(str2);
if (cr1 != cr2) {
/* may need to handle ENC_CODERANGE_BROKEN */
if (cr1 == ENC_CODERANGE_7BIT) return enc2;
if (cr2 == ENC_CODERANGE_7BIT) return enc1;
}
if (cr2 == ENC_CODERANGE_7BIT) {
if (idx1 == ENCINDEX_ASCII) return enc2;
return enc1;
}
}
if (cr1 == ENC_CODERANGE_7BIT)
return enc2;
    }
    return 0;
}

void
rb_enc_copy(VALUE obj1, VALUE obj2)
{
    rb_enc_associate_index(obj1, rb_enc_get_index(obj2));
}


/*
* call-seq:
* obj.encoding => encoding
*
* Returns the Encoding object that represents the encoding of obj.
*/

VALUE
rb_obj_encoding(VALUE obj)
{
    rb_encoding *enc = rb_enc_get(obj);
    if (!enc) {
rb_raise(rb_eTypeError, "unknown encoding");
    }
    return rb_enc_from_encoding(enc);
}

int
rb_enc_fast_mbclen(const char *p, const char *e, rb_encoding *enc)
{
    return ONIGENC_MBC_ENC_LEN(enc, (UChar*)p, (UChar*)e);
}

int
rb_enc_mbclen(const char *p, const char *e, rb_encoding *enc)
{
    int n = ONIGENC_PRECISE_MBC_ENC_LEN(enc, (UChar*)p, (UChar*)e);
    if (MBCLEN_CHARFOUND_P(n) && MBCLEN_CHARFOUND_LEN(n) <= e-p)
        return MBCLEN_CHARFOUND_LEN(n);
    else {
        int min = rb_enc_mbminlen(enc);
        return min <= e-p ? min : (int)(e-p);
    }
}

int
rb_enc_precise_mbclen(const char *p, const char *e, rb_encoding *enc)
{
    int n;
    if (e <= p)
        return ONIGENC_CONSTRUCT_MBCLEN_NEEDMORE(1);
    n = ONIGENC_PRECISE_MBC_ENC_LEN(enc, (UChar*)p, (UChar*)e);
    if (e-p < n)
        return ONIGENC_CONSTRUCT_MBCLEN_NEEDMORE(n-(int)(e-p));
    return n;
}

int
rb_enc_ascget(const char *p, const char *e, int *len, rb_encoding *enc)
{
    unsigned int c, l;
    if (e <= p)
        return -1;
    if (rb_enc_asciicompat(enc)) {
        c = (unsigned char)*p;
        if (!ISASCII(c))
            return -1;
        if (len) *len = 1;
        return c;
    }
    l = rb_enc_precise_mbclen(p, e, enc);
    if (!MBCLEN_CHARFOUND_P(l))
        return -1;
    c = rb_enc_mbc_to_codepoint(p, e, enc);
    if (!rb_enc_isascii(c, enc))
        return -1;
    if (len) *len = l;
    return c;
}

unsigned int
rb_enc_codepoint_len(const char *p, const char *e, int *len_p, rb_encoding *enc)
{
    int r;
    if (e <= p)
        rb_raise(rb_eArgError, "empty string");
    r = rb_enc_precise_mbclen(p, e, enc);
    if (MBCLEN_CHARFOUND_P(r)) {
if (len_p) *len_p = MBCLEN_CHARFOUND_LEN(r);
        return rb_enc_mbc_to_codepoint(p, e, enc);
    }
    else
rb_raise(rb_eArgError, "invalid byte sequence in %s", rb_enc_name(enc));
}

#undef rb_enc_codepoint
unsigned int
rb_enc_codepoint(const char *p, const char *e, rb_encoding *enc)
{
    return rb_enc_codepoint_len(p, e, 0, enc);
}

int
rb_enc_codelen(int c, rb_encoding *enc)
{
    int n = ONIGENC_CODE_TO_MBCLEN(enc,c);
    if (n == 0) {
rb_raise(rb_eArgError, "invalid codepoint 0x%x in %s", c, rb_enc_name(enc));
    }
    return n;
}

int
rb_enc_toupper(int c, rb_encoding *enc)
{
    return (ONIGENC_IS_ASCII_CODE(c)?ONIGENC_ASCII_CODE_TO_UPPER_CASE(c):(c));
}

int
rb_enc_tolower(int c, rb_encoding *enc)
{
    return (ONIGENC_IS_ASCII_CODE(c)?ONIGENC_ASCII_CODE_TO_LOWER_CASE(c):(c));
}

/*
* call-seq:
* enc.inspect => string
*
* Returns a string which represents the encoding for programmers.
*
* Encoding::UTF_8.inspect #=> "#<Encoding:UTF-8>"
* Encoding::ISO_2022_JP.inspect #=> "#<Encoding:ISO-2022-JP (dummy)>"
*/
static VALUE
enc_inspect(VALUE self)
{
    VALUE str = rb_sprintf("#<%s:%s%s>", rb_obj_classname(self),
rb_enc_name((rb_encoding*)DATA_PTR(self)),
(enc_dummy_p(self) ? " (dummy)" : ""));
    ENCODING_CODERANGE_SET(str, rb_usascii_encindex(), ENC_CODERANGE_7BIT);
    return str;
}

/*
* call-seq:
* enc.name => string
*
* Returns the name of the encoding.
*
* Encoding::UTF_8.name => "UTF-8"
*/
static VALUE
enc_name(VALUE self)
{
    return rb_usascii_str_new2(rb_enc_name((rb_encoding*)DATA_PTR(self)));
}

static int
enc_names_i(st_data_t name, st_data_t idx, st_data_t args)
{
    VALUE *arg = (VALUE *)args;

    if ((int)idx == (int)arg[0]) {
VALUE str = rb_usascii_str_new2((char *)name);
OBJ_FREEZE(str);
rb_ary_push(arg[1], str);
    }
    return ST_CONTINUE;
}

/*
* call-seq:
* enc.names => array
*
* Returns the list of name and aliases of the encoding.
*
* Encoding::WINDOWS_31J.names => ["Windows-31J", "CP932", "csWindows31J"]
*/
static VALUE
enc_names(VALUE self)
{
    VALUE args[2];

    args[0] = (VALUE)rb_to_encoding_index(self);
    args[1] = rb_ary_new2(0);
    st_foreach(enc_table.names, enc_names_i, (st_data_t)args);
    return args[1];
}

/*
* call-seq:
* Encoding.list => [enc1, enc2, ...]
*
* Returns the list of loaded encodings.
*
* Encoding.list
* => [#<Encoding:ASCII-8BIT>, #<Encoding:UTF-8>,
* #<Encoding:ISO-2022-JP (dummy)>]
*
* Encoding.find("US-ASCII")
* => #<Encoding:US-ASCII>
*
* Encoding.list
* => [#<Encoding:ASCII-8BIT>, #<Encoding:UTF-8>,
* #<Encoding:US-ASCII>, #<Encoding:ISO-2022-JP (dummy)>]
*
*/
static VALUE
enc_list(VALUE klass)
{
    VALUE ary = rb_ary_new2(0);
    rb_ary_replace(ary, rb_encoding_list);
    return ary;
}

/*
* call-seq:
* Encoding.find(string) => enc
* Encoding.find(symbol) => enc
*
* Search the encoding with specified <i>name</i>.
* <i>name</i> should be a string or symbol.
*
* Encoding.find("US-ASCII") => #<Encoding:US-ASCII>
* Encoding.find(:Shift_JIS) => #<Encoding:Shift_JIS>
*
* An ArgumentError is raised when no encoding with <i>name</i>.
* Only +Encoding.find("internal")+ however returns nil when no encoding named "internal",
* in other words, when Ruby has no default internal encoding.
*/
static VALUE
enc_find(VALUE klass, VALUE enc)
{
    return rb_enc_from_encoding(to_encoding(enc));
}

/*
* call-seq:
* Encoding.compatible?(str1, str2) => enc or nil
*
* Checks the compatibility of two strings.
* If they are compatible, means concatenatable,
* returns an encoding which the concatinated string will be.
* If they are not compatible, nil is returned.
*
* Encoding.compatible?("\xa1".force_encoding("iso-8859-1"), "b")
* => #<Encoding:ISO-8859-1>
*
* Encoding.compatible?(
* "\xa1".force_encoding("iso-8859-1"),
* "\xa1\xa1".force_encoding("euc-jp"))
* => nil
*
*/
static VALUE
enc_compatible_p(VALUE klass, VALUE str1, VALUE str2)
{
    rb_encoding *enc;

    if (!enc_capable(str1)) return Qnil;
    if (!enc_capable(str2)) return Qnil;
    enc = rb_enc_compatible(str1, str2);
    if (!enc) return Qnil;
    return rb_enc_from_encoding(enc);
}

/* :nodoc: */
static VALUE
enc_dump(int argc, VALUE *argv, VALUE self)
{
    rb_scan_args(argc, argv, "01", 0);
    return enc_name(self);
}

/* :nodoc: */
static VALUE
enc_load(VALUE klass, VALUE str)
{
    return enc_find(klass, str);
}

rb_encoding *
rb_ascii8bit_encoding(void)
{
    if (!enc_table.list) {
rb_enc_init();
    }
    return enc_table.list[ENCINDEX_ASCII].enc;
}

int
rb_ascii8bit_encindex(void)
{
    return ENCINDEX_ASCII;
}

rb_encoding *
rb_utf8_encoding(void)
{
    if (!enc_table.list) {
rb_enc_init();
    }
    return enc_table.list[ENCINDEX_UTF_8].enc;
}

int
rb_utf8_encindex(void)
{
    return ENCINDEX_UTF_8;
}

rb_encoding *
rb_usascii_encoding(void)
{
    if (!enc_table.list) {
rb_enc_init();
    }
    return enc_table.list[ENCINDEX_US_ASCII].enc;
}

int
rb_usascii_encindex(void)
{
    return ENCINDEX_US_ASCII;
}

rb_encoding *
rb_locale_encoding(void)
{
    VALUE charmap = rb_locale_charmap(rb_cEncoding);
    int idx;

    if (NIL_P(charmap))
        idx = rb_usascii_encindex();
    else if ((idx = rb_enc_find_index(StringValueCStr(charmap))) < 0)
        idx = rb_ascii8bit_encindex();

    if (rb_enc_registered("locale") < 0) enc_alias_internal("locale", idx);

    return rb_enc_from_index(idx);
}

rb_encoding *
rb_filesystem_encoding(void)
{
    rb_encoding *enc;
#if defined NO_LOCALE_CHARMAP
    enc = rb_default_external_encoding();
#elif defined _WIN32 || defined __CYGWIN__
    char cp[sizeof(int) * 8 / 3 + 4];
    snprintf(cp, sizeof cp, "CP%d", AreFileApisANSI() ? GetACP() : GetOEMCP());
    enc = rb_enc_find(cp);
#elif defined __APPLE__
    enc = rb_utf8_encoding();
#else
    enc = rb_default_external_encoding();
#endif
    return enc;
}

struct default_encoding {
    int index; /* -2 => not yet set, -1 => nil */
    rb_encoding *enc;
};

static int
enc_set_default_encoding(struct default_encoding *def, VALUE encoding, const char *name)
{
    int overridden = FALSE;

    if (def->index != -2)
/* Already set */
overridden = TRUE;

    if (NIL_P(encoding)) {
def->index = -1;
def->enc = 0;
st_insert(enc_table.names, (st_data_t)strdup(name),
(st_data_t)UNSPECIFIED_ENCODING);
    }
    else {
def->index = rb_enc_to_index(rb_to_encoding(encoding));
def->enc = 0;
enc_alias_internal(name, def->index);
    }

    return overridden;
}

static struct default_encoding default_external = {0};

rb_encoding *
rb_default_external_encoding(void)
{
    if (default_external.enc) return default_external.enc;

    if (default_external.index >= 0) {
        default_external.enc = rb_enc_from_index(default_external.index);
        return default_external.enc;
    }
    else {
        return rb_locale_encoding();
    }
}

VALUE
rb_enc_default_external(void)
{
    return rb_enc_from_encoding(rb_default_external_encoding());
}

/*
* call-seq:
* Encoding.default_external => enc
*
* Returns default external encoding.
*
* It is initialized by the locale or -E option.
*/
static VALUE
get_default_external(VALUE klass)
{
    return rb_enc_default_external();
}

void
rb_enc_set_default_external(VALUE encoding)
{
    if (NIL_P(encoding)) {
        rb_raise(rb_eArgError, "default external can not be nil");
    }
    enc_set_default_encoding(&default_external, encoding,
                            "external");
}

/*
* call-seq:
* Encoding.default_external = enc
*
* Sets default external encoding.
*/
static VALUE
set_default_external(VALUE klass, VALUE encoding)
{
    rb_warning("setting Encoding.default_external");
    rb_enc_set_default_external(encoding);
    return encoding;
}

static struct default_encoding default_internal = {-2};

rb_encoding *
rb_default_internal_encoding(void)
{
    if (!default_internal.enc && default_internal.index >= 0) {
        default_internal.enc = rb_enc_from_index(default_internal.index);
    }
    return default_internal.enc; /* can be NULL */
}

VALUE
rb_enc_default_internal(void)
{
    /* Note: These functions cope with default_internal not being set */
    return rb_enc_from_encoding(rb_default_internal_encoding());
}

/*
* call-seq:
* Encoding.default_internal => enc
*
* Returns default internal encoding.
*
* It is initialized by the source internal_encoding or -E option.
*/
static VALUE
get_default_internal(VALUE klass)
{
    return rb_enc_default_internal();
}

void
rb_enc_set_default_internal(VALUE encoding)
{
    enc_set_default_encoding(&default_internal, encoding,
                            "internal");
}

/*
* call-seq:
* Encoding.default_internal = enc or nil
*
* Sets default internal encoding.
* Or removes default internal encoding when passed nil.
*/
static VALUE
set_default_internal(VALUE klass, VALUE encoding)
{
    rb_warning("setting Encoding.default_internal");
    rb_enc_set_default_internal(encoding);
    return encoding;
}

/*
* call-seq:
* Encoding.locale_charmap => string
*
* Returns the locale charmap name.
*
* Debian GNU/Linux
* LANG=C
* Encoding.locale_charmap => "ANSI_X3.4-1968"
* LANG=ja_JP.EUC-JP
* Encoding.locale_charmap => "EUC-JP"
*
* SunOS 5
* LANG=C
* Encoding.locale_charmap => "646"
* LANG=ja
* Encoding.locale_charmap => "eucJP"
*
* The result is higly platform dependent.
* So Encoding.find(Encoding.locale_charmap) may cause an error.
* If you need some encoding object even for unknown locale,
* Encoding.find("locale") can be used.
*
*/
VALUE
rb_locale_charmap(VALUE klass)
{
#if defined NO_LOCALE_CHARMAP
    return rb_usascii_str_new2("ASCII-8BIT");
#elif defined _WIN32 || defined __CYGWIN__
    const char *nl_langinfo_codeset(void);
    const char *codeset = nl_langinfo_codeset();
    char cp[sizeof(int) * 3 + 4];
    if (!codeset) {
snprintf(cp, sizeof(cp), "CP%d", GetConsoleCP());
codeset = cp;
    }
    return rb_usascii_str_new2(codeset);
#elif defined HAVE_LANGINFO_H
    char *codeset;
    codeset = nl_langinfo(CODESET);
    return rb_usascii_str_new2(codeset);
#else
    return Qnil;
#endif
}

static void
set_encoding_const(const char *name, rb_encoding *enc)
{
    VALUE encoding = rb_enc_from_encoding(enc);
    char *s = (char *)name;
    int haslower = 0, hasupper = 0, valid = 0;

    if (ISDIGIT(*s)) return;
    if (ISUPPER(*s)) {
hasupper = 1;
while (*++s && (ISALNUM(*s) || *s == '_')) {
if (ISLOWER(*s)) haslower = 1;
}
    }
    if (!*s) {
if (s - name > ENCODING_NAMELEN_MAX) return;
valid = 1;
rb_define_const(rb_cEncoding, name, encoding);
    }
    if (!valid || haslower) {
size_t len = s - name;
if (len > ENCODING_NAMELEN_MAX) return;
if (!haslower || !hasupper) {
do {
if (ISLOWER(*s)) haslower = 1;
if (ISUPPER(*s)) hasupper = 1;
} while (*++s && (!haslower || !hasupper));
len = s - name;
}
len += strlen(s);
if (len++ > ENCODING_NAMELEN_MAX) return;
MEMCPY(s = ALLOCA_N(char, len), name, char, len);
name = s;
if (!valid) {
if (ISLOWER(*s)) *s = ONIGENC_ASCII_CODE_TO_UPPER_CASE((int)*s);
for (; *s; ++s) {
if (!ISALNUM(*s)) *s = '_';
}
if (hasupper) {
rb_define_const(rb_cEncoding, name, encoding);
}
}
if (haslower) {
for (s = (char *)name; *s; ++s) {
if (ISLOWER(*s)) *s = ONIGENC_ASCII_CODE_TO_UPPER_CASE((int)*s);
}
rb_define_const(rb_cEncoding, name, encoding);
}
    }
}

static int
rb_enc_name_list_i(st_data_t name, st_data_t idx, st_data_t arg)
{
    VALUE ary = (VALUE)arg;
    VALUE str = rb_usascii_str_new2((char *)name);
    OBJ_FREEZE(str);
    rb_ary_push(ary, str);
    return ST_CONTINUE;
}

/*
* call-seq:
* Encoding.name_list => ["enc1", "enc2", ...]
*
* Returns the list of available encoding names.
*
* Encoding.name_list
* => ["US-ASCII", "ASCII-8BIT", "UTF-8",
* "ISO-8859-1", "Shift_JIS", "EUC-JP",
* "Windows-31J",
* "BINARY", "CP932", "eucJP"]
*
*/

static VALUE
rb_enc_name_list(VALUE klass)
{
    VALUE ary = rb_ary_new2(enc_table.names->num_entries);
    st_foreach(enc_table.names, rb_enc_name_list_i, (st_data_t)ary);
    return ary;
}

static int
rb_enc_aliases_enc_i(st_data_t name, st_data_t orig, st_data_t arg)
{
    VALUE *p = (VALUE *)arg;
    VALUE aliases = p[0], ary = p[1];
    int idx = (int)orig;
    VALUE key, str = rb_ary_entry(ary, idx);

    if (NIL_P(str)) {
rb_encoding *enc = rb_enc_from_index(idx);

if (!enc) return ST_CONTINUE;
if (STRCASECMP((char*)name, rb_enc_name(enc)) == 0) {
return ST_CONTINUE;
}
str = rb_usascii_str_new2(rb_enc_name(enc));
OBJ_FREEZE(str);
rb_ary_store(ary, idx, str);
    }
    key = rb_usascii_str_new2((char *)name);
    OBJ_FREEZE(key);
    rb_hash_aset(aliases, key, str);
    return ST_CONTINUE;
}

/*
* call-seq:
* Encoding.aliases => {"alias1" => "orig1", "alias2" => "orig2", ...}
*
* Returns the hash of available encoding alias and original encoding name.
*
* Encoding.aliases
* => {"BINARY"=>"ASCII-8BIT", "ASCII"=>"US-ASCII", "ANSI_X3.4-1986"=>"US-ASCII",
* "SJIS"=>"Shift_JIS", "eucJP"=>"EUC-JP", "CP932"=>"Windows-31J"}
*
*/

static VALUE
rb_enc_aliases(VALUE klass)
{
    VALUE aliases[2];
    aliases[0] = rb_hash_new();
    aliases[1] = rb_ary_new();
    st_foreach(enc_table.names, rb_enc_aliases_enc_i, (st_data_t)aliases);
    return aliases[0];
}

void
Init_Encoding(void)
{
#undef rb_intern
#define rb_intern(str) rb_intern_const(str)
    VALUE list;
    int i;

    rb_cEncoding = rb_define_class("Encoding", rb_cObject);
    rb_undef_alloc_func(rb_cEncoding);
    rb_define_method(rb_cEncoding, "to_s", enc_name, 0);
    rb_define_method(rb_cEncoding, "inspect", enc_inspect, 0);
    rb_define_method(rb_cEncoding, "name", enc_name, 0);
    rb_define_method(rb_cEncoding, "names", enc_names, 0);
    rb_define_method(rb_cEncoding, "dummy?", enc_dummy_p, 0);
    rb_define_method(rb_cEncoding, "ascii_compatible?", enc_ascii_compatible_p, 0);
    rb_define_singleton_method(rb_cEncoding, "list", enc_list, 0);
    rb_define_singleton_method(rb_cEncoding, "name_list", rb_enc_name_list, 0);
    rb_define_singleton_method(rb_cEncoding, "aliases", rb_enc_aliases, 0);
    rb_define_singleton_method(rb_cEncoding, "find", enc_find, 1);
    rb_define_singleton_method(rb_cEncoding, "compatible?", enc_compatible_p, 2);

    rb_define_method(rb_cEncoding, "_dump", enc_dump, -1);
    rb_define_singleton_method(rb_cEncoding, "_load", enc_load, 1);

    rb_define_singleton_method(rb_cEncoding, "default_external", get_default_external, 0);
    rb_define_singleton_method(rb_cEncoding, "default_external=", set_default_external, 1);
    rb_define_singleton_method(rb_cEncoding, "default_internal", get_default_internal, 0);
    rb_define_singleton_method(rb_cEncoding, "default_internal=", set_default_internal, 1);
    rb_define_singleton_method(rb_cEncoding, "locale_charmap", rb_locale_charmap, 0);

    list = rb_ary_new2(enc_table.count);
    RBASIC(list)->klass = 0;
    rb_encoding_list = list;
    rb_gc_register_mark_object(list);

    for (i = 0; i < enc_table.count; ++i) {
rb_ary_push(list, enc_new(enc_table.list[i].enc));
    }
}

/* locale insensitive functions */

#define ctype_test(c, ctype) \
(rb_isascii(c) && ONIGENC_IS_ASCII_CODE_CTYPE((c), ctype))

int rb_isalnum(int c) { return ctype_test(c, ONIGENC_CTYPE_ALNUM); }
int rb_isalpha(int c) { return ctype_test(c, ONIGENC_CTYPE_ALPHA); }
int rb_isblank(int c) { return ctype_test(c, ONIGENC_CTYPE_BLANK); }
int rb_iscntrl(int c) { return ctype_test(c, ONIGENC_CTYPE_CNTRL); }
int rb_isdigit(int c) { return ctype_test(c, ONIGENC_CTYPE_DIGIT); }
int rb_isgraph(int c) { return ctype_test(c, ONIGENC_CTYPE_GRAPH); }
int rb_islower(int c) { return ctype_test(c, ONIGENC_CTYPE_LOWER); }
int rb_isprint(int c) { return ctype_test(c, ONIGENC_CTYPE_PRINT); }
int rb_ispunct(int c) { return ctype_test(c, ONIGENC_CTYPE_PUNCT); }
int rb_isspace(int c) { return ctype_test(c, ONIGENC_CTYPE_SPACE); }
int rb_isupper(int c) { return ctype_test(c, ONIGENC_CTYPE_UPPER); }
int rb_isxdigit(int c) { return ctype_test(c, ONIGENC_CTYPE_XDIGIT); }

int
rb_tolower(int c)
{
    return rb_isascii(c) ? ONIGENC_ASCII_CODE_TO_LOWER_CASE(c) : c;
}

int
rb_toupper(int c)
{
    return rb_isascii(c) ? ONIGENC_ASCII_CODE_TO_UPPER_CASE(c) : c;
}
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