171 lines
3.6 KiB
C
171 lines
3.6 KiB
C
#ifndef LINK_H
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#define LINK_H
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/**
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* \file link.h
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* \brief link related structures and functions
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*/
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#include "util.h"
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#include <curl/curl.h>
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/** \brief Link type */
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typedef struct Link Link;
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#include "cache.h"
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/** \brief the link type */
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typedef enum {
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LINK_HEAD = 'H',
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LINK_DIR = 'D',
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LINK_FILE = 'F',
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LINK_INVALID = 'I',
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LINK_UNINITIALISED_FILE = 'U'
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} LinkType;
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/** \brief for storing downloaded data in memory */
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typedef struct {
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char *data;
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size_t size;
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} DataStruct;
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/** \brief specify the type of data transfer */
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typedef enum {
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FILESTAT = 's',
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DATA = 'd'
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} TransferType;
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/** \brief for storing the link being transferred, and metadata */
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typedef struct {
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TransferType type;
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int transferring;
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Link *link;
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} TransferStruct;
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/**
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* \brief link table type
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* \details index 0 contains the Link for the base URL
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*/
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typedef struct LinkTable LinkTable;
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/**
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* \brief Link type data structure
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*/
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struct Link {
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/** \brief The link name in the last level of the URL */
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char linkname[MAX_FILENAME_LEN+1];
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/** \brief The full URL of the file */
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char f_url[MAX_PATH_LEN+1];
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/** \brief The type of the link */
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LinkType type;
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/** \brief CURLINFO_CONTENT_LENGTH_DOWNLOAD of the file */
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size_t content_length;
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/** \brief The next LinkTable level, if it is a LINK_DIR */
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LinkTable *next_table;
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/** \brief CURLINFO_FILETIME obtained from the server */
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long time;
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/** \brief How many times associated cache has been opened */
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int cache_opened;
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/** \brief The pointer associated with the cache file */
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Cache *cache_ptr;
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/**
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* \brief Sonic Music Directory ID
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* \details We use linkname to store filename
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*/
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int sonic_id;
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/**
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* \brief Sonic Music Directory ID in string format
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*/
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char sonic_id_str[MAX_FILENAME_LEN+1];
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};
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struct LinkTable {
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int num;
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Link **links;
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};
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/**
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* \brief root link table
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*/
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extern LinkTable *ROOT_LINK_TBL;
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/**
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* \brief the offset for calculating partial URL
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*/
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extern int ROOT_LINK_OFFSET;
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/**
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* \brief initialise link sub-system.
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*/
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LinkTable *LinkSystem_init(const char *url);
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/**
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* \brief Add a link to the curl multi bundle for querying stats
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*/
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void Link_req_file_stat(Link *this_link);
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/**
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* \brief Set the stats of a link, after curl multi handle finished querying
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*/
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void Link_set_file_stat(Link* this_link, CURL *curl);
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/**
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* \brief create a new LinkTable
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*/
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LinkTable *LinkTable_new(const char *url);
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/**
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* \brief download a link
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* \return the number of bytes downloaded
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*/
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long path_download(const char *path, char *output_buf, size_t size,
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off_t offset);
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/**
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* \brief find the link associated with a path
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*/
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Link *path_to_Link(const char *path);
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/**
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* \brief return the link table for the associated path
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*/
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LinkTable *path_to_Link_LinkTable_new(const char *path);
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/**
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* \brief dump a link table to the disk.
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*/
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int LinkTable_disk_save(LinkTable *linktbl, const char *dirn);
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/**
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* \brief load a link table from the disk.
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*/
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LinkTable *LinkTable_disk_open(const char *dirn);
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/**
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* \brief Download a link's content to the memory
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* \warning You MUST free the memory field in DataStruct after use!
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*/
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DataStruct Link_to_DataStruct(Link *head_link);
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/**
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* \brief Allocate a LinkTable
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* \note This does not fill in the LinkTable.
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*/
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LinkTable *LinkTable_alloc(const char *url);
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/**
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* \brief free a LinkTable
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*/
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void LinkTable_free(LinkTable *linktbl);
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/**
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* \brief print a LinkTable
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*/
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void LinkTable_print(LinkTable *linktbl);
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/**
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* \brief add a Link to a LinkTable
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*/
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void LinkTable_add(LinkTable *linktbl, Link *link);
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#endif
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