zip_open - Man Page

open zip archive

Library

libzip (-lzip)

Synopsis

#include <zip.h>

zip_t *
zip_open(const char *path, int flags, int *errorp);

zip_t *
zip_open_from_source(zip_source_t *zs, int flags, zip_error_t *ze);

Description

The zip_open() function opens the zip archive specified by path and returns a pointer to a struct zip, used to manipulate the archive. The flags are specified by or'ing the following values, or 0 for none of them.

ZIP_CHECKCONS

Perform additional stricter consistency checks on the archive, and error if they fail.

ZIP_CREATE

Create the archive if it does not exist.

ZIP_EXCL

Error if archive already exists.

ZIP_TRUNCATE

If archive exists, ignore its current contents. In other words, handle it the same way as an empty archive.

ZIP_RDONLY

Open archive in read-only mode.

If an error occurs and errorp is non-NULL, it will be set to the corresponding error code.

The zip_open_from_source() function opens a zip archive encapsulated by the zip_source zs using the provided flags. In case of error, the zip_error ze is filled in.

Return Values

Upon successful completion zip_open() and zip_open_from_source() return a struct zip pointer. Otherwise, NULL is returned and zip_open() sets *errorp to indicate the error, while zip_open_from(source) sets ze to indicate the error.

Examples

Here's an example of how you could report errors during zip_open:

    zip_t *za;
    int err;

    if ((za = zip_open(name, 0, &err)) == NULL) {
        zip_error_t error;
        zip_error_init_with_code(&error, err);
        fprintf(stderr, "%s: cannot open zip archive '%s': %s\n",
	        progname, name, zip_error_strerror(&error));
        zip_error_fini(&error);
        return -1;
    }

Errors

The archive specified by path is opened unless:

[ZIP_ER_EXISTS]

The file specified by path exists and ZIP_EXCL is set.

[ZIP_ER_INCONS]

Inconsistencies were found in the file specified by path. This error is often caused by specifying ZIP_CHECKCONS but can also happen without it.

[ZIP_ER_INVAL]

The path argument is NULL.

[ZIP_ER_MEMORY]

Required memory could not be allocated.

[ZIP_ER_NOENT]

The file specified by path does not exist and ZIP_CREATE is not set.

[ZIP_ER_NOZIP]

The file specified by path is not a zip archive.

[ZIP_ER_OPEN]

The file specified by path could not be opened.

[ZIP_ER_READ]

A read error occurred; see errno for details.

[ZIP_ER_SEEK]

The file specified by path does not allow seeks.

For newly created archives, zip_open() does not try to create the file; this is done when calling zip_close(3) and any errors, like missing write permissions, will be reported then.

See Also

libzip(3), zip_close(3), zip_error_strerror(3), zip_fdopen(3), zip_source(5)

History

zip_open() and zip_open_from_source() were added in libzip 1.0.

Authors

Dieter Baron <dillo@nih.at> and Thomas Klausner <wiz@gatalith.at>

Referenced By

libzip(3), zip(5), zip_close(3), zip_fdopen(3), zip_source(5), zip_source_buffer(3), zip_source_buffer_fragment(3), zip_source_free(3).

The man page zip_open_from_source(3) is an alias of zip_open(3).

May 5, 2025