/*
   +----------------------------------------------------------------------+
   | PHP Version 4                                                        |
   +----------------------------------------------------------------------+
   | Copyright (c) 1997-2002 The PHP Group                                |
   +----------------------------------------------------------------------+
   | This source file is subject to version 2.02 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available at through the world-wide-web at                           |
   | http://www.php.net/license/2_02.txt.                                 |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Authors: Rui Hirokawa <rui_hirokawa@ybb.ne.jp>                       |
   |          Stig Bakken <ssb@fast.no>                                   |
   +----------------------------------------------------------------------+
 */

/* $Id$ */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "php.h"

#if HAVE_ICONV

#include <iconv.h>

#include "php_globals.h"
#include "php_iconv.h"
#include "ext/standard/info.h"
#include "main/php_output.h"
#include "SAPI.h"
#include "php_ini.h"


#if HAVE_LIBICONV
#define icv_open(a, b) libiconv_open(a, b)
#define icv_close(a) libiconv_close(a)
#define icv(a, b, c, d, e) libiconv(a, b, c, d, e)
#else
#define icv_open(a, b) iconv_open(a, b)
#define icv_close(a) iconv_close(a)
#define icv(a, b, c, d, e) iconv(a, b, c, d, e)
#endif


/* {{{ iconv_functions[] 
 */
function_entry iconv_functions[] = {
	PHP_NAMED_FE(iconv,php_if_iconv,				NULL)
	PHP_FE(ob_iconv_handler,						NULL)
	PHP_FE(iconv_get_encoding,						NULL)
	PHP_FE(iconv_set_encoding,						NULL)
	{NULL, NULL, NULL}	
};
/* }}} */

/* {{{ iconv_module_entry
 */
zend_module_entry iconv_module_entry = {
	STANDARD_MODULE_HEADER,
	"iconv",
	iconv_functions,
	PHP_MINIT(miconv),
	PHP_MSHUTDOWN(miconv),
	NULL,
	NULL,
	PHP_MINFO(miconv),
    NO_VERSION_YET,
	STANDARD_MODULE_PROPERTIES
};
/* }}} */

ZEND_DECLARE_MODULE_GLOBALS(iconv)

#ifdef COMPILE_DL_ICONV
ZEND_GET_MODULE(iconv)
#endif

static int php_iconv_string(char *, unsigned int, char **, unsigned int *, char *, char *);

/* {{{ PHP_INI
 */
PHP_INI_BEGIN()
	 STD_PHP_INI_ENTRY("iconv.input_encoding",	  ICONV_INPUT_ENCODING,    PHP_INI_ALL, OnUpdateString,  input_encoding,	zend_iconv_globals,  iconv_globals)
	 STD_PHP_INI_ENTRY("iconv.output_encoding",	  ICONV_OUTPUT_ENCODING,   PHP_INI_ALL, OnUpdateString,  output_encoding,	zend_iconv_globals,  iconv_globals)
	 STD_PHP_INI_ENTRY("iconv.internal_encoding", ICONV_INTERNAL_ENCODING, PHP_INI_ALL, OnUpdateString,  internal_encoding,	zend_iconv_globals,  iconv_globals)
PHP_INI_END()
/* }}} */

static void php_iconv_init_globals(zend_iconv_globals *iconv_globals)
{
	iconv_globals->input_encoding = NULL;
	iconv_globals->output_encoding = NULL;
	iconv_globals->internal_encoding = NULL;
}

PHP_MINIT_FUNCTION(miconv)
{
	ZEND_INIT_MODULE_GLOBALS(iconv, php_iconv_init_globals, NULL);
	REGISTER_INI_ENTRIES();
	return SUCCESS;
}

PHP_MSHUTDOWN_FUNCTION(miconv)
{
	UNREGISTER_INI_ENTRIES();
	return SUCCESS;
}

PHP_MINFO_FUNCTION(miconv)
{
	php_info_print_table_start();
	php_info_print_table_header(2, "iconv support", "enabled");
	php_info_print_table_end();

	DISPLAY_INI_ENTRIES();
}

/* {{{ php_iconv_string
 */
static int php_iconv_string(char *in_p, unsigned int in_len,
							char **out, unsigned int *out_len,
							char *in_charset, char *out_charset)
{
    unsigned int in_size, out_size, out_left;
    char *out_buffer, *out_p;
    iconv_t cd;
    size_t result;
    typedef unsigned int ucs4_t;
	
    in_size  = in_len;

    /*
	  FIXME: This is not the right way to get output size...
	  This is not space efficient for large text.
	  This is also problem for encoding like UTF-7/UTF-8/ISO-2022 which
	  a single char can be more than 4 bytes.
	  I added 15 extra bytes for safety. <yohgaki@php.net>
	*/
    out_size = in_len * sizeof(ucs4_t) + 16;
    out_buffer = (char *) emalloc(out_size);

	*out = out_buffer;
    out_p = out_buffer;
	out_left = out_size;
  
    cd = icv_open(out_charset, in_charset);
  
	if (cd == (iconv_t)(-1)) {
		php_error(E_WARNING, "iconv: cannot convert from `%s' to `%s'",
				  in_charset, out_charset);
		efree(out_buffer);
		return FAILURE;
	}
	
	result = icv(cd, (char **) &in_p, &in_size, (char **)
				   &out_p, &out_left);

    if (result == (size_t)(-1)) {
		efree(out_buffer);
		return FAILURE;
    }

	*out_len = out_size - out_left;
	out_buffer[*out_len] = '\0';
    icv_close(cd);

    return SUCCESS;
}
/* }}} */

/* {{{ proto string iconv(string in_charset, string out_charset, string str)
   Returns str converted to the out_charset character set */
PHP_NAMED_FUNCTION(php_if_iconv)
{
	zval **in_charset, **out_charset, **in_buffer;
	char *out_buffer;
	unsigned int out_len;
	
	if (ZEND_NUM_ARGS() != 3 || zend_get_parameters_ex(3, &in_charset, &out_charset, &in_buffer) == FAILURE) {
		WRONG_PARAM_COUNT;
	}

	convert_to_string_ex(in_charset);
	convert_to_string_ex(out_charset);
	convert_to_string_ex(in_buffer);

	if (php_iconv_string(Z_STRVAL_PP(in_buffer), Z_STRLEN_PP(in_buffer),
						 &out_buffer,  &out_len,
						 Z_STRVAL_PP(in_charset), Z_STRVAL_PP(out_charset)) == SUCCESS) {
		RETVAL_STRINGL(out_buffer, out_len, 0);
	} else {
		RETURN_FALSE;
	}
}
/* }}} */

/* {{{ proto string ob_iconv_handler(string contents, int status)
   Returns str in output buffer converted to the iconv.output_encoding character set */
PHP_FUNCTION(ob_iconv_handler)
{
	char *out_buffer;
	zval **zv_string, **zv_status;
	unsigned int out_len;

	if (ZEND_NUM_ARGS()!=2 || zend_get_parameters_ex(2, &zv_string, &zv_status)==FAILURE) {
		ZEND_WRONG_PARAM_COUNT();
	}

	convert_to_string_ex(zv_string);
	convert_to_long_ex(zv_status);

	if (SG(sapi_headers).send_default_content_type &&
		php_iconv_string(Z_STRVAL_PP(zv_string), Z_STRLEN_PP(zv_string),
						 &out_buffer, &out_len,
						 ICONVG(internal_encoding), 
						 ICONVG(output_encoding))==SUCCESS) {
		RETVAL_STRINGL(out_buffer, out_len, 0);
	} else {
		zval_dtor(return_value);
		*return_value = **zv_string;
		zval_copy_ctor(return_value);		
	}
	
}
/* }}} */

/* {{{ proto bool iconv_set_encoding(string type, string charset)
   Sets internal encoding and output encoding for ob_iconv_handler() */
PHP_FUNCTION(iconv_set_encoding)
{
	zval **type, **charset;
	int argc = ZEND_NUM_ARGS();

	if (argc != 2 || zend_get_parameters_ex(2, &type, &charset) == FAILURE) {
		WRONG_PARAM_COUNT;
	}

	convert_to_string_ex(type);
	convert_to_string_ex(charset);

	if(!strcasecmp("input_encoding", Z_STRVAL_PP(type))) {
		if (ICONVG(input_encoding)) {
			free(ICONVG(input_encoding));
		}
		ICONVG(input_encoding) = estrndup(Z_STRVAL_PP(charset), Z_STRLEN_PP(charset));
	} else if(!strcasecmp("output_encoding", Z_STRVAL_PP(type))) {
		if (ICONVG(output_encoding)) {
			free(ICONVG(output_encoding));
		}
		ICONVG(output_encoding) = estrndup(Z_STRVAL_PP(charset), Z_STRLEN_PP(charset));
	} else if(!strcasecmp("internal_encoding", Z_STRVAL_PP(type))) {
		if (ICONVG(internal_encoding)) {
			free(ICONVG(internal_encoding));
		}
		ICONVG(internal_encoding) = estrndup(Z_STRVAL_PP(charset), Z_STRLEN_PP(charset));
	} else {
		RETURN_FALSE;
	}

	RETURN_TRUE;
}
/* }}} */

/* {{{ proto array iconv_get_encoding([string type])
   Get internal encoding and output encoding for ob_iconv_handler() */
PHP_FUNCTION(iconv_get_encoding)
{
	zval **type;
	int argc = ZEND_NUM_ARGS();

	if (argc < 0 || argc > 1 || zend_get_parameters_ex(1, &type) == FAILURE) {
		WRONG_PARAM_COUNT;
	}

	convert_to_string_ex(type);

	if (argc == 0 || !strcasecmp("all", Z_STRVAL_PP(type))) {
		if (array_init(return_value) == FAILURE) {
			RETURN_FALSE;
		}
		add_assoc_string(return_value, "input_encoding", 
						 ICONVG(input_encoding), 1);
		add_assoc_string(return_value, "output_encoding", 
						 ICONVG(output_encoding), 1);
		add_assoc_string(return_value, "internal_encoding", 
						 ICONVG(internal_encoding), 1);
	} else if (!strcasecmp("input_encoding", Z_STRVAL_PP(type))) {
		RETVAL_STRING(ICONVG(input_encoding), 1);
	} else if (!strcasecmp("output_encoding", Z_STRVAL_PP(type))) {
		RETVAL_STRING(ICONVG(output_encoding), 1);
	} else if (!strcasecmp("internal_encoding", Z_STRVAL_PP(type))) {
		RETVAL_STRING(ICONVG(internal_encoding), 1);
	} else {
		RETURN_FALSE;
	}

}
/* }}} */

#endif

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