ZIP_FOPEN(3) Library Functions Manual ZIP_FOPEN(3)

zip_fopen, zip_fopen_index —
open file in zip archive for reading

libzip (-lzip)

#include <zip.h>

zip_file_t *
zip_fopen(zip_t *archive, const char *fname, zip_flags_t flags);

zip_file_t *
zip_fopen_index(zip_t *archive, zip_uint64_t index, zip_flags_t flags);

The zip_fopen() function opens the file name fname in archive. The flags argument specifies how the name lookup should be done, according to the values are described in zip_name_locate(3). Also, the following values may be or'ed to it.
Read the compressed data. Otherwise the data is uncompressed by zip_fread().
Read the original data from the zip archive, ignoring any changes made to the file.

The zip_fopen_index() function opens the file at position index.

If encrypted data is encountered, the functions call zip_fopen_encrypted(3) or zip_fopen_index_encrypted(3) respectively, using the default password set with zip_set_default_password(3).

Upon successful completion, a struct zip_file pointer is returned. Otherwise, NULL is returned and the error code in archive is set to indicate the error.

[]
The file data has been changed.
[]
The compression method used is not supported.
[]
The encryption method used is not supported.
[]
Required memory could not be allocated.
[]
The file is encrypted, but no password has been provided.
[]
A file read error occurred.
[]
A file seek error occurred.
[]
The provided password does not match the password used for encryption. Note that some incorrect passwords are not detected by the check done by zip_fopen().
[]
Initializing the zlib stream failed.

The function zip_fopen() may also fail and set zip_err for any of the errors specified for the routine zip_name_locate(3).

The function zip_fopen_index() may also fail with ZIP_ER_INVAL if index is invalid.

libzip(3), zip_fclose(3), zip_fread(3), zip_fseek(3), zip_get_num_entries(3), zip_name_locate(3), zip_set_default_password(3)

zip_fopen() and zip_fopen_index() were added in libzip 1.0.

Dieter Baron <dillo@nih.at> and Thomas Klausner <tk@giga.or.at>
December 18, 2017 NiH