mirror of https://github.com/PCSX2/pcsx2.git
121 lines
4.3 KiB
C
121 lines
4.3 KiB
C
/*
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zip_file_set_encryption.c -- set encryption for file in archive
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Copyright (C) 2016-2021 Dieter Baron and Thomas Klausner
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This file is part of libzip, a library to manipulate ZIP archives.
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The authors can be contacted at <info@libzip.org>
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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3. The names of the authors may not be used to endorse or promote
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products derived from this software without specific prior
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written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
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OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "zipint.h"
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#include <stdlib.h>
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#include <string.h>
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ZIP_EXTERN int
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zip_file_set_encryption(zip_t *za, zip_uint64_t idx, zip_uint16_t method, const char *password) {
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zip_entry_t *e;
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zip_uint16_t old_method;
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if (idx >= za->nentry) {
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zip_error_set(&za->error, ZIP_ER_INVAL, 0);
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return -1;
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}
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if (ZIP_IS_RDONLY(za)) {
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zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
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return -1;
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}
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if (ZIP_WANT_TORRENTZIP(za)) {
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zip_error_set(&za->error, ZIP_ER_NOT_ALLOWED, 0);
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return -1;
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}
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if (method != ZIP_EM_NONE && _zip_get_encryption_implementation(method, ZIP_CODEC_ENCODE) == NULL) {
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zip_error_set(&za->error, ZIP_ER_ENCRNOTSUPP, 0);
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return -1;
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}
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e = za->entry + idx;
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old_method = (e->orig == NULL ? ZIP_EM_NONE : e->orig->encryption_method);
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if (method == old_method && password == NULL) {
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if (e->changes) {
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if (e->changes->changed & ZIP_DIRENT_PASSWORD) {
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_zip_crypto_clear(e->changes->password, strlen(e->changes->password));
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free(e->changes->password);
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e->changes->password = (e->orig == NULL ? NULL : e->orig->password);
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}
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e->changes->changed &= ~(ZIP_DIRENT_ENCRYPTION_METHOD | ZIP_DIRENT_PASSWORD);
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if (e->changes->changed == 0) {
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_zip_dirent_free(e->changes);
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e->changes = NULL;
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}
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}
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}
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else {
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char *our_password = NULL;
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if (password) {
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if ((our_password = strdup(password)) == NULL) {
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zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
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return -1;
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}
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}
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if (e->changes == NULL) {
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if ((e->changes = _zip_dirent_clone(e->orig)) == NULL) {
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if (our_password) {
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_zip_crypto_clear(our_password, strlen(our_password));
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}
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free(our_password);
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zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
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return -1;
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}
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}
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e->changes->encryption_method = method;
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e->changes->changed |= ZIP_DIRENT_ENCRYPTION_METHOD;
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if (password) {
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e->changes->password = our_password;
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e->changes->changed |= ZIP_DIRENT_PASSWORD;
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}
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else {
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if (e->changes->changed & ZIP_DIRENT_PASSWORD) {
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_zip_crypto_clear(e->changes->password, strlen(e->changes->password));
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free(e->changes->password);
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e->changes->password = e->orig ? e->orig->password : NULL;
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e->changes->changed &= ~ZIP_DIRENT_PASSWORD;
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}
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}
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}
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return 0;
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}
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