/*
 * BSD 3-Clause License
 *
 * Copyright (c) 2017-2018, plures
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


#include "string.h"
#include "ndtypes.h"


/******************************************************************************/
/*                                 Encodings                                  */
/******************************************************************************/

enum ndt_encoding
ndt_encoding_from_string(const char *s, ndt_context_t *ctx)
{
    if (strcmp(s, "A") == 0 ||
        strcmp(s, "ascii") == 0 ||
        strcmp(s, "us-ascii") == 0) {
        return Ascii;
    }
    else if (strcmp(s, "U8") == 0 ||
             strcmp(s, "utf8") == 0 ||
             strcmp(s, "utf-8") == 0) {
        return Utf8;
    }
    else if (strcmp(s, "U16") == 0 ||
             strcmp(s, "utf16") == 0 ||
             strcmp(s, "utf-16") == 0) {
        return Utf16;
    }
    else if (strcmp(s, "U32") == 0 ||
             strcmp(s, "utf32") == 0 ||
             strcmp(s, "utf-32") == 0) {
        return Utf32;
    }
    else if (strcmp(s, "ucs2") == 0 ||
             strcmp(s, "ucs-2") == 0 ||
             strcmp(s, "ucs_2") == 0) {
        return Ucs2;
    }
    else {
        ndt_err_format(ctx, NDT_ValueError, "invalid encoding: '%s'", s);
        return Ascii;
    }
}

const char *
ndt_encoding_as_string(enum ndt_encoding encoding)
{
    switch (encoding) {
    case Ascii:
        return "'ascii'";
    case Utf8:
        return "'utf8'";
    case Utf16:
        return "'utf16'";
    case Utf32:
        return "'utf32'";
    case Ucs2:
        return "'ucs2'";
    }

    /* NOT REACHED: tags should be exhaustive. */
    ndt_internal_error("invalid encoding");
}

size_t
ndt_sizeof_encoding(enum ndt_encoding encoding)
{
    switch (encoding) {
    case Ascii: case Utf8:
        return 1;
    case Utf16: case Ucs2:
        return 2;
    case Utf32:
        return 4;
    }

    /* NOT REACHED: tags should be exhaustive. */
    ndt_internal_error("invalid encoding");
}

uint16_t
ndt_alignof_encoding(enum ndt_encoding encoding)
{
    return (uint16_t)ndt_sizeof_encoding(encoding);
}