src/lib-charset/charset-utf8.c

	charset-utf8.c revision e59faf65ce864fe95dc00f5d52b8323cdbd0608a
/* Copyright (c) 2002-2010 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "buffer.h"
#include "str.h"
#include "unichar.h"
#include "charset-utf8.h"

#include <ctype.h>

bool charset_is_utf8(const char *charset)
{
    return strcasecmp(charset, "us-ascii") == 0 ||
        strcasecmp(charset, "ascii") == 0 ||
        strcasecmp(charset, "UTF-8") == 0 ||
        strcasecmp(charset, "UTF8") == 0;
}

int charset_to_utf8_str(const char *charset, enum charset_flags flags,
            const char *input, string_t *output,
            enum charset_result *result_r)
{
    struct charset_translation *t;
    size_t len = strlen(input);

    if (charset_to_utf8_begin(charset, flags, &t) < 0)
        return -1;

    *result_r = charset_to_utf8(t, (const unsigned char *)input,
                    &len, output);
    charset_to_utf8_end(&t);
    return 0;
}

#ifndef HAVE_ICONV

struct charset_translation {
    enum charset_flags flags;
};

static struct charset_translation raw_translation = { 0 };
static struct charset_translation tc_translation = {
    CHARSET_FLAG_DECOMP_TITLECASE
};

int charset_to_utf8_begin(const char *charset, enum charset_flags flags,
              struct charset_translation **t_r)
{
    if (charset_is_utf8(charset)) {
        if ((flags & CHARSET_FLAG_DECOMP_TITLECASE) != 0)
            *t_r = &tc_translation;
        else
            *t_r = &raw_translation;
        return 0;
    }

    /* no support for charsets that need translation */
    return -1;
}

void charset_to_utf8_end(struct charset_translation **t ATTR_UNUSED)
{
}

void charset_to_utf8_reset(struct charset_translation *t ATTR_UNUSED)
{
}

enum charset_result
charset_to_utf8(struct charset_translation *t,
        const unsigned char *src, size_t *src_size, buffer_t *dest)
{
    if ((t->flags & CHARSET_FLAG_DECOMP_TITLECASE) == 0)
        buffer_append(dest, src, *src_size);
    else {
        if (uni_utf8_to_decomposed_titlecase(src, *src_size, dest) < 0)
            return CHARSET_RET_INVALID_INPUT;
    }
    return CHARSET_RET_OK;
}

#endif