375 lines
8.9 KiB
C
375 lines
8.9 KiB
C
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/*
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zip_extra_field_api.c -- public extra fields API functions
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Copyright (C) 2012-2013 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 "zipint.h"
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ZIP_EXTERN int
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zip_file_extra_field_delete(struct zip *za, zip_uint64_t idx, zip_uint16_t ef_idx, zip_flags_t flags)
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{
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struct zip_dirent *de;
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if ((flags & ZIP_EF_BOTH) == 0) {
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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 (((flags & ZIP_EF_BOTH) == ZIP_EF_BOTH) && (ef_idx != ZIP_EXTRA_FIELD_ALL)) {
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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_get_dirent(za, idx, 0, NULL) == NULL)
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return -1;
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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_file_extra_field_prepare_for_change(za, idx) < 0)
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return -1;
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de = za->entry[idx].changes;
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de->extra_fields = _zip_ef_delete_by_id(de->extra_fields, ZIP_EXTRA_FIELD_ALL, ef_idx, flags);
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return 0;
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}
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ZIP_EXTERN int
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zip_file_extra_field_delete_by_id(struct zip *za, zip_uint64_t idx, zip_uint16_t ef_id, zip_uint16_t ef_idx, zip_flags_t flags)
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{
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struct zip_dirent *de;
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if ((flags & ZIP_EF_BOTH) == 0) {
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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 (((flags & ZIP_EF_BOTH) == ZIP_EF_BOTH) && (ef_idx != ZIP_EXTRA_FIELD_ALL)) {
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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_get_dirent(za, idx, 0, NULL) == NULL)
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return -1;
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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_file_extra_field_prepare_for_change(za, idx) < 0)
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return -1;
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de = za->entry[idx].changes;
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de->extra_fields = _zip_ef_delete_by_id(de->extra_fields, ef_id, ef_idx, flags);
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return 0;
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}
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ZIP_EXTERN const zip_uint8_t *
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zip_file_extra_field_get(struct zip *za, zip_uint64_t idx, zip_uint16_t ef_idx, zip_uint16_t *idp, zip_uint16_t *lenp, zip_flags_t flags)
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{
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static const zip_uint8_t empty[1] = { '\0' };
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struct zip_dirent *de;
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struct zip_extra_field *ef;
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int i;
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if ((flags & ZIP_EF_BOTH) == 0) {
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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 ((de=_zip_get_dirent(za, idx, flags, &za->error)) == NULL)
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return NULL;
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if (flags & ZIP_FL_LOCAL)
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if (_zip_read_local_ef(za, idx) < 0)
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return NULL;
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i = 0;
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for (ef=de->extra_fields; ef; ef=ef->next) {
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if (ef->flags & flags & ZIP_EF_BOTH) {
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if (i < ef_idx) {
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i++;
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continue;
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}
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if (idp)
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*idp = ef->id;
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if (lenp)
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*lenp = ef->size;
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if (ef->size > 0)
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return ef->data;
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else
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return empty;
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}
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}
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_zip_error_set(&za->error, ZIP_ER_NOENT, 0);
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return NULL;
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}
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ZIP_EXTERN const zip_uint8_t *
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zip_file_extra_field_get_by_id(struct zip *za, zip_uint64_t idx, zip_uint16_t ef_id, zip_uint16_t ef_idx, zip_uint16_t *lenp, zip_flags_t flags)
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{
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struct zip_dirent *de;
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if ((flags & ZIP_EF_BOTH) == 0) {
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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 ((de=_zip_get_dirent(za, idx, flags, &za->error)) == NULL)
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return NULL;
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if (flags & ZIP_FL_LOCAL)
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if (_zip_read_local_ef(za, idx) < 0)
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return NULL;
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return _zip_ef_get_by_id(de->extra_fields, lenp, ef_id, ef_idx, flags, &za->error);
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}
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ZIP_EXTERN zip_int16_t
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zip_file_extra_fields_count(struct zip *za, zip_uint64_t idx, zip_flags_t flags)
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{
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struct zip_dirent *de;
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struct zip_extra_field *ef;
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zip_uint16_t n;
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if ((flags & ZIP_EF_BOTH) == 0) {
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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 ((de=_zip_get_dirent(za, idx, flags, &za->error)) == NULL)
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return -1;
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if (flags & ZIP_FL_LOCAL)
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if (_zip_read_local_ef(za, idx) < 0)
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return -1;
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n = 0;
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for (ef=de->extra_fields; ef; ef=ef->next)
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if (ef->flags & flags & ZIP_EF_BOTH)
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n++;
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return (zip_int16_t)n;
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}
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ZIP_EXTERN zip_int16_t
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zip_file_extra_fields_count_by_id(struct zip *za, zip_uint64_t idx, zip_uint16_t ef_id, zip_flags_t flags)
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{
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struct zip_dirent *de;
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struct zip_extra_field *ef;
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zip_uint16_t n;
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if ((flags & ZIP_EF_BOTH) == 0) {
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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 ((de=_zip_get_dirent(za, idx, flags, &za->error)) == NULL)
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return -1;
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if (flags & ZIP_FL_LOCAL)
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if (_zip_read_local_ef(za, idx) < 0)
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return -1;
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n = 0;
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for (ef=de->extra_fields; ef; ef=ef->next)
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if (ef->id == ef_id && (ef->flags & flags & ZIP_EF_BOTH))
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n++;
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return (zip_int16_t)n;
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}
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ZIP_EXTERN int
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zip_file_extra_field_set(struct zip *za, zip_uint64_t idx, zip_uint16_t ef_id, zip_uint16_t ef_idx, const zip_uint8_t *data, zip_uint16_t len, zip_flags_t flags)
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{
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struct zip_dirent *de;
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zip_uint16_t ls, cs;
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struct zip_extra_field *ef, *ef_prev, *ef_new;
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int i, found, new_len;
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if ((flags & ZIP_EF_BOTH) == 0) {
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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_get_dirent(za, idx, 0, NULL) == NULL)
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return -1;
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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_EF_IS_INTERNAL(ef_id)) {
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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_file_extra_field_prepare_for_change(za, idx) < 0)
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return -1;
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de = za->entry[idx].changes;
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ef = de->extra_fields;
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ef_prev = NULL;
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i = 0;
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found = 0;
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for (; ef; ef=ef->next) {
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if (ef->id == ef_id && (ef->flags & flags & ZIP_EF_BOTH)) {
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if (i == ef_idx) {
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found = 1;
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break;
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}
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i++;
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}
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ef_prev = ef;
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}
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if (i < ef_idx && ef_idx != ZIP_EXTRA_FIELD_NEW) {
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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 (flags & ZIP_EF_LOCAL)
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ls = _zip_ef_size(de->extra_fields, ZIP_EF_LOCAL);
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else
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ls = 0;
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if (flags & ZIP_EF_CENTRAL)
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cs = _zip_ef_size(de->extra_fields, ZIP_EF_CENTRAL);
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else
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cs = 0;
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new_len = ls > cs ? ls : cs;
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if (found)
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new_len -= ef->size + 4;
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new_len += len + 4;
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if (new_len > ZIP_UINT16_MAX) {
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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 ((ef_new=_zip_ef_new(ef_id, len, data, flags)) == 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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if (found) {
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if ((ef->flags & ZIP_EF_BOTH) == (flags & ZIP_EF_BOTH)) {
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ef_new->next = ef->next;
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ef->next = NULL;
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_zip_ef_free(ef);
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if (ef_prev)
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ef_prev->next = ef_new;
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else
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de->extra_fields = ef_new;
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}
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else {
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ef->flags &= ~(flags & ZIP_EF_BOTH);
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ef_new->next = ef->next;
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ef->next = ef_new;
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}
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}
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else if (ef_prev) {
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ef_new->next = ef_prev->next;
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ef_prev->next = ef_new;
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}
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else
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de->extra_fields = ef_new;
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return 0;
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}
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int
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_zip_file_extra_field_prepare_for_change(struct zip *za, zip_uint64_t idx)
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{
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struct zip_entry *e;
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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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e = za->entry+idx;
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if (e->changes && (e->changes->changed & ZIP_DIRENT_EXTRA_FIELD))
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return 0;
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if (e->orig) {
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if (_zip_read_local_ef(za, idx) < 0)
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return -1;
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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) {
|
|||
|
|
_zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
|
|||
|
|
return -1;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (e->orig && e->orig->extra_fields) {
|
|||
|
|
if ((e->changes->extra_fields=_zip_ef_clone(e->orig->extra_fields, &za->error)) == NULL)
|
|||
|
|
return -1;
|
|||
|
|
}
|
|||
|
|
e->changes->changed |= ZIP_DIRENT_EXTRA_FIELD;
|
|||
|
|
|
|||
|
|
return 0;
|
|||
|
|
}
|
|||
|
|
|