zip_file_set_encryption.c File Reference

#include "zipint.h"
#include <stdlib.h>
#include <string.h>

Go to the source code of this file.

Functions
ZIP_EXTERN int	zip_file_set_encryption (zip_t *za, zip_uint64_t idx, zip_uint16_t method, const char *password)

Function Documentation

zip_file_set_encryption()

ZIP_EXTERN int zip_file_set_encryption	(	zip_t *	za,
		zip_uint64_t	idx,
		zip_uint16_t	method,
		const char *	password
	)

Definition at line 41 of file zip_file_set_encryption.c.

                                                                                                {
    zip_entry_t *e;
    zip_uint16_t old_method;
 
    if (idx >= za->nentry) {
        zip_error_set(&za->error, ZIP_ER_INVAL, 0);
        return -1;
    }
 
    if (ZIP_IS_RDONLY(za)) {
        zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
        return -1;
    }
 
    if (method != ZIP_EM_NONE && _zip_get_encryption_implementation(method, ZIP_CODEC_ENCODE) == NULL) {
        zip_error_set(&za->error, ZIP_ER_ENCRNOTSUPP, 0);
        return -1;
    }
 
    e = za->entry + idx;
 
    old_method = (e->orig == NULL ? ZIP_EM_NONE : e->orig->encryption_method);
 
    if (method == old_method && password == NULL) {
        if (e->changes) {
            if (e->changes->changed & ZIP_DIRENT_PASSWORD) {
                _zip_crypto_clear(e->changes->password, strlen(e->changes->password));
                free(e->changes->password);
                e->changes->password = (e->orig == NULL ? NULL : e->orig->password);
            }
            e->changes->changed &= ~(ZIP_DIRENT_ENCRYPTION_METHOD | ZIP_DIRENT_PASSWORD);
            if (e->changes->changed == 0) {
                _zip_dirent_free(e->changes);
                e->changes = NULL;
            }
        }
    }
    else {
        char *our_password = NULL;
 
        if (password) {
            if ((our_password = strdup(password)) == NULL) {
                zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
                return -1;
            }
        }
 
        if (e->changes == NULL) {
            if ((e->changes = _zip_dirent_clone(e->orig)) == NULL) {
                if (our_password) {
                    _zip_crypto_clear(our_password, strlen(our_password));
                }
                free(our_password);
                zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
                return -1;
            }
        }
 
        e->changes->encryption_method = method;
        e->changes->changed |= ZIP_DIRENT_ENCRYPTION_METHOD;
        if (password) {
            e->changes->password = our_password;
            e->changes->changed |= ZIP_DIRENT_PASSWORD;
        }
        else {
            if (e->changes->changed & ZIP_DIRENT_PASSWORD) {
                _zip_crypto_clear(e->changes->password, strlen(e->changes->password));
                free(e->changes->password);
                e->changes->password = e->orig ? e->orig->password : NULL;
                e->changes->changed &= ~ZIP_DIRENT_PASSWORD;
            }
        }
    }
 
    return 0;
}

References _zip_crypto_clear, _zip_dirent_clone(), _zip_dirent_free(), _zip_get_encryption_implementation(), e, zip::entry, zip::error, free(), setup::idx, zip::nentry, NULL, strdup(), za, ZIP_CODEC_ENCODE, ZIP_DIRENT_ENCRYPTION_METHOD, ZIP_DIRENT_PASSWORD, ZIP_EM_NONE, ZIP_ER_ENCRNOTSUPP, ZIP_ER_INVAL, ZIP_ER_MEMORY, ZIP_ER_RDONLY, zip_error_set(), and ZIP_IS_RDONLY.

Referenced by set_file_encryption().