/* Icecast
 *
 *  Copyright 2000-2004 Jack Moffitt <jack@xiph.org, 
 *                      Michael Smith <msmith@xiph.org>,
 *                      oddsock <oddsock@xiph.org>,
 *                      Karl Heyes <karl@xiph.org>
 *                      and others (see AUTHORS for details).
 *  Copyright 2012-2018 Philipp "ph3-der-loewe" Schafft <lion@lion.leolix.org>
 *
 *  This program is distributed under the GNU General Public License, version 2.
 *  A copy of this license is included with this source.
 */

#ifndef __UTIL_H__
#define __UTIL_H__

/* for FILE* */
#include <stdio.h>

#define UNKNOWN_CONTENT 0
#define XSLT_CONTENT    1
#define HTML_CONTENT    2

#define READ_ENTIRE_HEADER 1
#define READ_LINE 0

#define MAX_LINE_LEN 512

int util_timed_wait_for_fd(sock_t fd, int timeout);
int util_read_header(sock_t sock, char *buff, unsigned long len, int entire);
int util_check_valid_extension(const char *uri);
char *util_get_extension(const char *path);
char *util_get_path_from_uri(char *uri);
char *util_get_path_from_normalised_uri(const char *uri);
char *util_normalise_uri(const char *uri);
char *util_base64_encode(const char *data, size_t len);
char *util_base64_decode(const char *input);
char *util_bin_to_hex(unsigned char *data, int len);

typedef enum _util_hostcheck_tag {
 HOSTCHECK_ERROR = -1,
 HOSTCHECK_SANE  = 0,
 HOSTCHECK_NOT_FQDN,
 HOSTCHECK_IS_LOCALHOST,
 HOSTCHECK_IS_IPV4,
 HOSTCHECK_IS_IPV6,
 HOSTCHECK_BADCHAR
} util_hostcheck_type;

util_hostcheck_type util_hostcheck(const char *hostname);

int util_str_to_bool(const char *str);
int util_str_to_loglevel(const char *str);
int util_str_to_int(const char *str, const int default_value);
unsigned int util_str_to_unsigned_int(const char *str, const unsigned int default_value);

char *util_url_unescape(const char *src);
char *util_url_escape(const char *src);

/* Function to build up a HTTP header.
 * out is the pointer to storage.
 * len is the total length of out.
 * offset is the offset in out we should start writing at if offset >= 0.
 * In this case the 'used' length is len-offset.
 * If offset is -1 we append at the end of out.
 * In this case the used length is len-strlen(out).
 * cache is a bool. If set allow the client to cache the content (static data).
 * if unset we will send no-caching headers.
 * status is the HTTP status code. If -1 no HTTP status header is generated.
 * statusmsg is the status header text. If NULL a default one
 * is used for the given status code. This is ignored if status is -1.
 * contenttype is the value for the Content-Type header.
 * if NULL no such header is generated.
 * charset is the charset for the object. If NULL no header is generated
 * or default is used.
 * datablock is random data added to the request.
 * If datablock is non NULL the end-of-header is appended as well as this datablock.
 * If datablock is NULL no end-of-header nor any data is appended.
 * Returns the number of bytes written or -1 on error.
 */
struct source_tag; /* use forward decleration so we do not need to
                    * include <source.h> that would cause other conflicts. */
ssize_t util_http_build_header(char * out, size_t len, ssize_t offset,
        int cache,
        int status, const char * statusmsg,
        const char * contenttype, const char * charset,
        const char * datablock,
        struct source_tag * source,
        struct _client_tag * client);

const char *util_http_select_best(const char *input, const char *first, ...);

typedef struct icecast_kv_tag {
    char *key;
    char *value;
} icecast_kv_t;

typedef struct icecast_kva_tag {
    void   *_tofree[3];
    size_t kvlen;
    size_t indexlen;
    size_t *index;
    icecast_kv_t *kv;
} icecast_kva_t;

icecast_kva_t * util_parse_http_cn(const char *cnstr);
void util_kva_free(icecast_kva_t *kva);

/* String dictionary type, without support for NULL keys, or multiple
 * instances of the same key */
typedef struct _util_dict {
  char *key;
  char *val;
  struct _util_dict *next;
} util_dict;

util_dict *util_dict_new(void);
void util_dict_free(util_dict *dict);
/* dict, key must not be NULL. */
int util_dict_set(util_dict *dict, const char *key, const char *val);
const char *util_dict_get(util_dict *dict, const char *key);
char *util_dict_urlencode(util_dict *dict, char delim);

#ifndef HAVE_LOCALTIME_R
struct tm *localtime_r(const time_t *timep, struct tm *result);
#endif
char *util_conv_string (const char *string, const char *in_charset, const char *out_charset);

int get_line(FILE *file, char *buf, size_t siz);
#endif  /* __UTIL_H__ */