77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
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/*
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zip_file_get_offset.c -- get offset of file data in archive.
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Copyright (C) 1999-2007 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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "zipint.h"
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/* _zip_file_get_offset(za, ze):
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Returns the offset of the file data for entry ze.
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On error, fills in za->error and returns 0.
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*/
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zip_uint64_t
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_zip_file_get_offset(const struct zip *za, zip_uint64_t idx, struct zip_error *error)
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{
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zip_uint64_t offset;
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zip_int32_t size;
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offset = za->entry[idx].orig->offset;
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if (fseeko(za->zp, (off_t)offset, SEEK_SET) != 0) {
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_zip_error_set(error, ZIP_ER_SEEK, errno);
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return 0;
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}
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/* TODO: cache? */
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if ((size=_zip_dirent_size(za->zp, ZIP_EF_LOCAL, error)) < 0)
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return 0;
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if (offset+(zip_uint32_t)size > ZIP_OFF_MAX) {
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_zip_error_set(error, ZIP_ER_SEEK, EFBIG);
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return 0;
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}
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return offset + (zip_uint32_t)size;
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}
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