170 lines
5 KiB
Groff
170 lines
5 KiB
Groff
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.\" Automatically generated from an mdoc input file. Do not edit.
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.\" zip_file_extra_field_get.mdoc -- get extra field for file in zip
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.\" Copyright (C) 2012-2017 Dieter Baron and Thomas Klausner
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.\"
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.\" This file is part of libzip, a library to manipulate ZIP files.
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.\" The authors can be contacted at <libzip@nih.at>
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.\"
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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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.\"
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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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.TH "ZIP_FILE_EXTRA_FIELD_GET" "3" "December 18, 2017" "NiH" "Library Functions Manual"
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.nh
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.if n .ad l
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.SH "NAME"
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\fBzip_file_extra_field_get\fR,
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\fBzip_file_extra_field_get_by_id\fR
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\- get extra field for file in zip
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.SH "LIBRARY"
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libzip (-lzip)
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.SH "SYNOPSIS"
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\fB#include <zip.h>\fR
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.sp
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\fIconst zip_uint8_t *\fR
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.br
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.PD 0
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.HP 4n
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\fBzip_file_extra_field_get\fR(\fIzip_t\ *archive\fR, \fIzip_uint64_t\ index\fR, \fIzip_uint16_t\ extra_field_index\fR, \fIzip_uint16_t\ *idp\fR, \fIzip_uint16_t\ *lenp\fR, \fIzip_flags_t\ flags\fR);
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.PD
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.PP
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\fIconst zip_uint8_t *\fR
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.br
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.PD 0
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.HP 4n
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\fBzip_file_extra_field_get_by_id\fR(\fIzip_t\ *archive\fR, \fIzip_uint64_t\ index\fR, \fIzip_uint16_t\ extra_field_id\fR, \fIzip_uint16_t\ extra_field_index\fR, \fIzip_uint16_t\ *lenp\fR, \fIzip_flags_t\ flags\fR);
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.PD
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.SH "DESCRIPTION"
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The
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\fBzip_file_extra_field_get\fR()
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function returns the extra field with index
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\fIextra_field_index\fR
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for the file at position
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\fIindex\fR
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in the zip archive.
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This pointer should not be modified or
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free(3)'d,
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and becomes invalid when
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\fIarchive\fR
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is closed.
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If
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\fIidp\fR
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is not
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\fRNULL\fR,
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the integer to which it points will be set to the ID (two-byte
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signature) of the selected extra field.
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If
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\fIlenp\fR
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is not
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\fRNULL\fR,
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the integer to which it points will be set to the length of the
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extra field.
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Generally speaking,
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\fIlenp\fR
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and
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\fIidp\fR
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should be passed since only the extra field data is returned (i.e.,
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neither the ID nor the length, if the
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\fIidp\fR
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and
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\fIlenp\fR
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arguments are not provided).
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.PP
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The following
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\fIflags\fR
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are supported:
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.RS 6n
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.TP 20n
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\fRZIP_FL_CENTRAL\fR
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Return extra fields from the archive's central directory.
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.TP 20n
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\fRZIP_FL_LOCAL\fR
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Return extra fields from the local file headers.
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.TP 20n
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\fRZIP_FL_UNCHANGED\fR
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Return the original unchanged extra fields, ignoring any changes made.
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.RE
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.PP
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The
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\fBzip_file_extra_field_get_by_id\fR()
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function returns the extra field with ID (two-byte signature)
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\fIextra_field_id\fR
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and index
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\fIextra_field_index\fR
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(in other words, the
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\fIextra_field_index\fR'th
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extra field with ID
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\fIextra_field_id\fR)
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The other arguments are the same as for
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\fBzip_file_extra_field_get\fR().
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.SH "RETURN VALUES"
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Upon successful completion, a pointer to an extra field is returned,
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or
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\fRNULL\fR
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if there is no extra field with that
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\fIextra_field_index\fR
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for the file with index
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\fIindex\fR.
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In case of an error,
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\fRNULL\fR
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is returned and the error code in
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\fIarchive\fR
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is set to indicate the error.
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.SH "ERRORS"
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\fBzip_file_extra_field_get\fR()
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and
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\fBzip_file_extra_field_get_by_id\fR()
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fail if:
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.TP 19n
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[\fRZIP_ER_NOENT\fR]
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\fIindex\fR
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is not a valid file index in
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\fIarchive\fR,
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or
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\fIextra_field_index\fR
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is not a valid extra file index (for ID
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\fIextra_field_id\fR).
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.SH "SEE ALSO"
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libzip(3),
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zip_file_extra_field_delete(3),
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zip_file_extra_field_set(3),
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zip_file_extra_fields_count(3)
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.SH "HISTORY"
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\fBzip_file_extra_field_get\fR()
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and
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\fBzip_file_extra_field_get_by_id\fR()
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were added in libzip 0.11.
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.SH "AUTHORS"
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Dieter Baron <\fIdillo@nih.at\fR>
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and
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Thomas Klausner <\fItk@giga.or.at\fR>
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.SH "CAVEATS"
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Please note that the extra field IDs 0x0001 (ZIP64 extension),
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0x6375 (Infozip UTF-8 comment), and
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0x7075 (Infozip UTF-8 file name) can not be read using
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\fBzip_file_extra_field_get\fR()
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since they are used by
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libzip(3)
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internally.
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