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elinks/src/session/download.h
Witold Filipczyk 443d42608d [dgi] Experimental DGI support.
Dos Gateway Interface was introduced by Arachne browser.
I tested two cases:
file/cdplayer.dgi   |[7]$ecdplayer.exe $s
application/pdf pdf>txt|$epdftotext $1 $2
2022-05-21 18:18:55 +02:00

264 lines
7.6 KiB
C

#ifndef EL__SESSION_DOWNLOAD_H
#define EL__SESSION_DOWNLOAD_H
#include "main/object.h"
#include "network/state.h"
#include "util/lists.h"
#include "util/time.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Silly BFU stuff */
struct dialog_data;
struct listbox_item;
struct terminal;
struct cache_entry;
struct connection;
struct session;
struct uri;
struct download;
typedef void (download_callback_T)(struct download *, void *);
/** Flags controlling how to download a file. This is a bit mask.
* Unrecognized bits should be preserved and ignored. */
enum download_flags {
/** Downloading cannot be resumed; do not offer such an option
* to the user. All bits clear. */
DOWNLOAD_RESUME_DISABLED = 0,
/** Downloading can be resumed. This is the usual value. */
DOWNLOAD_RESUME_ALLOWED = 1,
/** The user wants to resume downloading. This must not occur
* without #DOWNLOAD_RESUME_ALLOWED. */
DOWNLOAD_RESUME_SELECTED = 2,
/** The file will be opened in an external handler. */
DOWNLOAD_EXTERNAL = 4,
/** File overwriting is allowed. This is for temp names, since
* the file is created by the same function that chooses its
* name. */
DOWNLOAD_OVERWRITE = 8
};
typedef unsigned char download_flags_T;
struct download {
/* XXX: order matters there, there's some hard initialization in
* src/session/session.c and src/viewer/text/view.c */
LIST_HEAD(struct download);
struct connection *conn;
struct cache_entry *cached;
/** The callback is called when connection gets into a progress state,
* after it's over (in a result state), and also periodically after
* the download starts receiving some data. */
download_callback_T *callback;
void *data;
struct progress *progress;
struct connection_state state;
struct connection_state prev_error;
connection_priority_T pri;
};
/** The user has navigated to a resource that ELinks does not display
* automatically because of its MIME type, and ELinks is asking what
* to do.
*
* These structures are kept in the session.type_queries list, and
* destroy_session() calls done_type_query() to destroy them too. */
struct type_query {
LIST_HEAD(struct type_query);
/** After ELinks has downloaded enough of the resource to see
* that a type query is needed, it moves the download here and
* continues it while the user decides what to do. */
struct download download;
/** Cache entry loaded from #uri. Apparently used only for
* displaying the header. */
struct cache_entry *cached;
/** The session in which the user navigated to #uri. The
* type_query is in the session.type_queries list of this
* session. */
struct session *ses;
/** The URI of the resource about which ELinks is asking.
* This reference must be released with done_uri(). */
struct uri *uri;
/** The name of the frame in which the user navigated to #uri.
* If the user chooses to display the resource, it goes into
* this frame. This string must be freed with mem_free(). */
char *target_frame;
/** input filename extension */
char *inpext;
/** output filename extension */
char *outext;
/** Command line for an external handler, to be run when the
* download finishes. When ELinks displays the type query,
* it copies this from mime_handler.program of the default
* handler of the type. The user can then edit the string.
* This string must be freed with mem_free(). */
char *external_handler;
/** Whether the external handler is going to use the terminal.
* When ELinks displays the type query, it copies this from
* mime_handler.block of the default handler of the type.
* The user can then change the flag with a checkbox. */
int block;
/** Whether the resource was generated by ELinks running
* a local CGI program. If the user chooses to open the
* resource with an external handler, ELinks normally saves
* the resource to a temporary file and passes the name of
* that to the external handler. However, if the resource is
* from a "file" URI that does not refer to a local CGI, then
* Elinks need not copy the file. */
unsigned int cgi:1;
unsigned int dgi:1;
/** mailcap entry with copiousoutput */
unsigned int copiousoutput:1;
/* int frame; */
};
struct file_download {
OBJECT_HEAD(struct file_download);
struct uri *uri;
char *file;
char *external_handler;
struct session *ses;
/** The terminal in which message boxes about the download
* should be displayed. If this terminal is closed, then
* detach_downloads_from_terminal() changes the pointer to
* NULL, and get_default_terminal() will be used if a
* terminal is needed later. However, if the download has
* an external handler, then detach_downloads_from_terminal()
* aborts it right away; external handlers always run in the
* original terminal, if anywhere. */
struct terminal *term;
time_t remotetime;
off_t seek;
int handle;
int redirect_cnt;
int notify;
struct download download;
/** input filename extension */
char *inpext;
/** output filename extension */
char *outext;
/** Should the file be deleted when destroying the structure */
unsigned int delete_:1;
/** Should the download be stopped/interrupted when destroying the structure */
unsigned int stop:1;
/** Whether to block the terminal when running the external handler. */
unsigned int block:1;
unsigned int dgi:1;
/** Mailcap entry with copiousoutput */
unsigned int copiousoutput:1;
/** The current dialog for this download. Can be NULL. */
struct dialog_data *dlg_data;
struct listbox_item *box_item;
};
struct exec_dgi {
struct session *ses;
char *command;
char *file;
char *inpext;
char *outext;
unsigned int del:1;
};
/** Stack of all running downloads */
extern LIST_OF(struct file_download) downloads;
static inline int
is_in_downloads_list(struct file_download *file_download)
{
struct file_download *down;
foreach (down, downloads)
if (file_download == down) return 1;
return 0;
}
int download_is_progressing(struct download *download);
int are_there_downloads(void);
/** Type of the callback function that will be called when the file
* has been opened, or when it is known that the file will not be
* opened.
*
* @param term
* The terminal on which the callback should display any windows.
* Comes directly from the @a term argument of create_download_file().
*
* @param fd
* A file descriptor to the opened file, or -1 if the file will not be
* opened. If the @a real_file argument of create_download_file()
* was not NULL, the callback may read the name of this file from
* *@a real_file.
*
* @param data
* A pointer to any data that the callback cares about.
* Comes directly from the @a data argument of create_download_file().
*
* @param flags
* The same as the @a flags argument of create_download_file(),
* except the ::DOWNLOAD_RESUME_SELECTED bit will be changed to match
* what the user chose.
*
* @relates cdf_hop */
typedef void cdf_callback_T(struct terminal *term, int fd,
void *data, download_flags_T flags);
void start_download(void *, char *);
void resume_download(void *, char *);
void create_download_file(struct terminal *, char *, char **,
download_flags_T, cdf_callback_T *, void *);
void abort_all_downloads(void);
void destroy_downloads(struct session *);
void detach_downloads_from_terminal(struct terminal *);
int setup_download_handler(struct session *, struct download *, struct cache_entry *, int);
void abort_download(struct file_download *file_download);
void done_type_query(struct type_query *type_query);
void tp_display(struct type_query *type_query);
void tp_save(struct type_query *type_query);
void tp_cancel(void *data);
struct file_download *init_file_download(struct uri *uri, struct session *ses, char *file, int fd);
#ifdef __cplusplus
}
#endif
#endif