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192 lines
5.0 KiB
C
192 lines
5.0 KiB
C
/*
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zip_fopen_index_encrypted.c -- open file for reading by index w/ password
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Copyright (C) 1999-2009 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 <libzip@nih.at>
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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 <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "zipint.h"
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static struct zip_file *_zip_file_new(struct zip *za);
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ZIP_EXTERN(struct zip_file *)
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zip_fopen_index_encrypted(struct zip *za, zip_uint64_t fileno, int flags,
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const char *password)
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{
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struct zip_file *zf;
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zip_compression_implementation comp_impl;
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zip_encryption_implementation enc_impl;
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struct zip_source *src, *s2;
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zip_uint64_t start;
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struct zip_stat st;
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if (fileno >= za->nentry) {
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_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
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return NULL;
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}
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if ((flags & ZIP_FL_UNCHANGED) == 0
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&& ZIP_ENTRY_DATA_CHANGED(za->entry+fileno)) {
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_zip_error_set(&za->error, ZIP_ER_CHANGED, 0);
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return NULL;
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}
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if (fileno >= za->cdir->nentry) {
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_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
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return NULL;
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}
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if (flags & ZIP_FL_ENCRYPTED)
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flags |= ZIP_FL_COMPRESSED;
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zip_stat_index(za, fileno, flags, &st);
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enc_impl = NULL;
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if ((flags & ZIP_FL_ENCRYPTED) == 0) {
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if (st.encryption_method != ZIP_EM_NONE) {
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if (password == NULL) {
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_zip_error_set(&za->error, ZIP_ER_NOPASSWD, 0);
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return NULL;
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}
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if ((enc_impl=zip_get_encryption_implementation(
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st.encryption_method)) == NULL) {
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_zip_error_set(&za->error, ZIP_ER_ENCRNOTSUPP, 0);
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return NULL;
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}
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}
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}
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comp_impl = NULL;
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if ((flags & ZIP_FL_COMPRESSED) == 0) {
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if (st.comp_method != ZIP_CM_STORE) {
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if ((comp_impl=zip_get_compression_implementation(
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st.comp_method)) == NULL) {
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_zip_error_set(&za->error, ZIP_ER_COMPNOTSUPP, 0);
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return NULL;
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}
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}
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}
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if ((start=_zip_file_get_offset(za, fileno)) == 0)
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return NULL;
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if (st.comp_size == 0) {
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if ((src=zip_source_buffer(za, NULL, 0, 0)) == NULL)
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return NULL;
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}
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else {
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if ((src=_zip_source_file_or_p(za, NULL, za->zp, start, st.comp_size,
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0, &st)) == NULL)
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return NULL;
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if (enc_impl) {
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if ((s2=enc_impl(za, src, ZIP_EM_TRAD_PKWARE, 0,
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password)) == NULL) {
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zip_source_free(src);
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/* XXX: set error (how?) */
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return NULL;
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}
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src = s2;
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}
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if (comp_impl) {
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if ((s2=comp_impl(za, src, za->cdir->entry[fileno].comp_method,
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0)) == NULL) {
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zip_source_free(src);
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/* XXX: set error (how?) */
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return NULL;
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}
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src = s2;
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}
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if ((flags & ZIP_FL_COMPRESSED) == 0
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|| st.comp_method == ZIP_CM_STORE ) {
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if ((s2=zip_source_crc(za, src, 1)) == NULL) {
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zip_source_free(src);
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/* XXX: set error (how?) */
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return NULL;
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}
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src = s2;
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}
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}
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if (zip_source_open(src) < 0) {
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_zip_error_set_from_source(&za->error, src);
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zip_source_free(src);
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return NULL;
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}
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zf = _zip_file_new(za);
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zf->src = src;
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return zf;
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}
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static struct zip_file *
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_zip_file_new(struct zip *za)
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{
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struct zip_file *zf, **file;
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int n;
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if ((zf=(struct zip_file *)malloc(sizeof(struct zip_file))) == NULL) {
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_zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
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return NULL;
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}
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if (za->nfile >= za->nfile_alloc-1) {
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n = za->nfile_alloc + 10;
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file = (struct zip_file **)realloc(za->file,
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n*sizeof(struct zip_file *));
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if (file == NULL) {
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_zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
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free(zf);
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return NULL;
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}
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za->nfile_alloc = n;
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za->file = file;
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}
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za->file[za->nfile++] = zf;
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zf->za = za;
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_zip_error_init(&zf->error);
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zf->eof = 0;
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zf->src = NULL;
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return zf;
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}
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