/*

 zip_io_util.c -- I/O helper functions

 Copyright (C) 1999-2025 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 <limits.h>

#include <stdlib.h>

#include <string.h>

#include <zlib.h>

int

_zip_read(zip_source_t *src, zip_uint8_t *b, zip_uint64_t length, zip_error_t *error) {

    zip_int64_t n;

    if (length > ZIP_INT64_MAX) {

        zip_error_set(error, ZIP_ER_INTERNAL, 0);

        return -1;

    }

    if ((n = zip_source_read(src, b, length)) < 0) {

        zip_error_set_from_source(error, src);

        return -1;

    }

    if (n < (zip_int64_t)length) {

        zip_error_set(error, ZIP_ER_EOF, 0);

        return -1;

    }

    return 0;

}

zip_uint8_t *

_zip_read_data(zip_buffer_t *buffer, zip_source_t *src, size_t length, bool nulp, zip_error_t *error) {

    zip_uint8_t *r;

    if (length == 0 && !nulp) {

        return NULL;

    }

    r = (zip_uint8_t *)malloc(length + (nulp ? 1 : 0));

    if (r == NULL) {

        zip_error_set(error, ZIP_ER_MEMORY, 0);

        return NULL;

    }

    if (buffer) {

        zip_uint8_t *data = _zip_buffer_get(buffer, length);

        if (data == NULL) {

            zip_error_set(error, ZIP_ER_MEMORY, 0);

            free(r);

            return NULL;

        }

        (void)memcpy_s(r, length, data, length);

    }

    else {

        if (_zip_read(src, r, length, error) < 0) {

            free(r);

            return NULL;

        }

    }

    if (nulp) {

        r[length] = 0;

    }

    return r;

}

zip_string_t *

_zip_read_string(zip_buffer_t *buffer, zip_source_t *src, zip_uint16_t len, bool nulp, zip_error_t *error) {

    zip_uint8_t *raw;

    zip_string_t *s;

    if ((raw = _zip_read_data(buffer, src, len, nulp, error)) == NULL)

        return NULL;

    s = _zip_string_new(raw, len, ZIP_FL_ENC_GUESS, error);

    free(raw);

    return s;

}

int

_zip_write(zip_t *za, const void *data, zip_uint64_t length) {

    zip_int64_t n;

    if ((n = zip_source_write(za->src, data, length)) < 0) {

        zip_error_set_from_source(&za->error, za->src);

        return -1;

    }

    if ((zip_uint64_t)n != length) {

        zip_error_set(&za->error, ZIP_ER_WRITE, EINTR);

        return -1;

    }

    if (za->write_crc != NULL) {

        zip_uint64_t position = 0;

        while (position < length) {

            zip_uint64_t nn = ZIP_MIN(UINT_MAX, length - position);

            *za->write_crc = (zip_uint32_t)crc32(*za->write_crc, (const Bytef *)data + position, (uInt)nn);

            position += nn;

        }

    }

    return 0;

}