/*

  zip_string.c -- string handling (with encoding)

  Copyright (C) 2012-2024 Dieter Baron and Thomas Klausner

  This file is part of libzip, a library to manipulate ZIP archives.

  The authors can be contacted at <info@libzip.org>

  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. The names of the authors may not be used to endorse or promote

     products derived from this software without specific prior

     written permission.

  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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 "zipint.h"

#include <stdlib.h>

#include <string.h>

#include <zlib.h>

zip_uint32_t

_zip_string_crc32(const zip_string_t *s) {

    zip_uint32_t crc;

    crc = (zip_uint32_t)crc32(0L, Z_NULL, 0);

    if (s != NULL)

        crc = (zip_uint32_t)crc32(crc, s->raw, s->length);

    return crc;

}

int

_zip_string_equal(const zip_string_t *a, const zip_string_t *b) {

    if (a == NULL || b == NULL)

        return a == b;

    if (a->length != b->length)

        return 0;

    /* TODO: encoding */

    return (memcmp(a->raw, b->raw, a->length) == 0);

}

void

_zip_string_free(zip_string_t *s) {

    if (s == NULL)

        return;

    free(s->raw);

    free(s->converted);

    free(s);

}

const zip_uint8_t *

_zip_string_get(zip_string_t *string, zip_uint32_t *lenp, zip_flags_t flags, zip_error_t *error) {

    static const zip_uint8_t empty[1] = "";

    if (string == NULL) {

        if (lenp)

            *lenp = 0;

        return empty;

    }

    if ((flags & ZIP_FL_ENC_RAW) == 0) {

        /* start guessing */

        if (string->encoding == ZIP_ENCODING_UNKNOWN) {

            /* guess encoding, sets string->encoding */

            (void)_zip_guess_encoding(string, ZIP_ENCODING_UNKNOWN);

        }

        if (((flags & ZIP_FL_ENC_STRICT) && string->encoding != ZIP_ENCODING_ASCII && string->encoding != ZIP_ENCODING_UTF8_KNOWN) || (string->encoding == ZIP_ENCODING_CP437)) {

            if (string->converted == NULL) {

                if ((string->converted = _zip_cp437_to_utf8(string->raw, string->length, &string->converted_length, error)) == NULL)

                    return NULL;

            }

            if (lenp)

                *lenp = string->converted_length;

            return string->converted;

        }

    }

    if (lenp)

        *lenp = string->length;

    return string->raw;

}

bool _zip_string_is_ascii(const zip_string_t *string) {

    if (string->encoding != ZIP_ENCODING_ASCII) {

        zip_uint16_t i;

        for (i = 0; i < string->length; i++) {

            if (string->raw[i] & 0x80) {

                return false;

            }

        }

    }

    return true;

}

zip_uint16_t

_zip_string_length(const zip_string_t *s) {

    if (s == NULL)

        return 0;

    return s->length;

}

zip_string_t *

_zip_string_new(const zip_uint8_t *raw, zip_uint16_t length, zip_flags_t flags, zip_error_t *error) {

    zip_string_t *s;

    zip_encoding_type_t expected_encoding;

    if (length == 0)

        return NULL;

    switch (flags & ZIP_FL_ENCODING_ALL) {

    case ZIP_FL_ENC_GUESS:

        expected_encoding = ZIP_ENCODING_UNKNOWN;

        break;

    case ZIP_FL_ENC_UTF_8:

        expected_encoding = ZIP_ENCODING_UTF8_KNOWN;

        break;

    case ZIP_FL_ENC_CP437:

        expected_encoding = ZIP_ENCODING_CP437;

        break;

    default:

        zip_error_set(error, ZIP_ER_INVAL, 0);

        return NULL;

    }

    if ((s = (zip_string_t *)malloc(sizeof(*s))) == NULL) {

        zip_error_set(error, ZIP_ER_MEMORY, 0);

        return NULL;

    }

    if ((s->raw = (zip_uint8_t *)malloc((size_t)length + 1)) == NULL) {

        free(s);

        return NULL;

    }

    (void)memcpy_s(s->raw, length + 1, raw, length);

    s->raw[length] = '\0';

    s->length = length;

    s->encoding = ZIP_ENCODING_UNKNOWN;

    s->converted = NULL;

    s->converted_length = 0;

    if (expected_encoding != ZIP_ENCODING_UNKNOWN) {

        if (_zip_guess_encoding(s, expected_encoding) == ZIP_ENCODING_ERROR) {

            _zip_string_free(s);

            zip_error_set(error, ZIP_ER_INVAL, 0);

            return NULL;

        }

    }

    return s;

}

int

_zip_string_write(zip_t *za, const zip_string_t *s) {

    if (s == NULL)

        return 0;

    return _zip_write(za, s->raw, s->length);

}