transmission/libtransmission/makemeta.h

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// This file Copyright © 2007-2022 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0), GPLv3 (SPDX: GPL-3.0),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#pragma once
#include <cstdint> // uint32_t, uint64_t
#include "transmission.h"
struct tr_metainfo_builder_file
{
char* filename;
uint64_t size;
bool is_portable;
};
enum class TrMakemetaResult
{
OK,
CANCELLED,
ERR_URL, // invalid announce URL
ERR_IO_READ, // see builder.errfile, builder.my_errno
ERR_IO_WRITE // see builder.errfile, builder.my_errno
};
struct tr_tracker_info
{
int tier;
char* announce;
};
struct tr_metainfo_builder
{
/**
*** These are set by tr_makeMetaInfoBuilderCreate()
*** and cleaned up by tr_metaInfoBuilderFree()
**/
char* top;
tr_metainfo_builder_file* files;
uint64_t totalSize;
uint32_t fileCount;
uint32_t pieceSize;
uint32_t pieceCount;
bool isFolder;
/**
*** These are set inside tr_makeMetaInfo()
*** by copying the arguments passed to it,
*** and cleaned up by tr_metaInfoBuilderFree()
**/
tr_tracker_info* trackers;
int trackerCount;
char** webseeds;
int webseedCount;
char* comment;
char* outputFile;
bool isPrivate;
char* source;
/**
*** These are set inside tr_makeMetaInfo() so the client
*** can poll periodically to see what the status is.
*** The client can also set abortFlag to nonzero to
*** tell tr_makeMetaInfo() to abort and clean up after itself.
**/
uint32_t pieceIndex;
bool abortFlag;
bool isDone;
TrMakemetaResult result;
/* file in use when result was set to _IO_READ or _IO_WRITE,
* or the URL in use when the result was set to _URL */
char errfile[2048];
/* errno encountered when result was set to _IO_READ or _IO_WRITE */
int my_errno;
/**
*** This is an implementation detail.
*** The client should never use these fields.
**/
struct tr_metainfo_builder* nextBuilder;
};
tr_metainfo_builder* tr_metaInfoBuilderCreate(char const* topFile);
/**
* Call this before tr_makeMetaInfo() to override the builder.pieceSize
* and builder.pieceCount values that were set by tr_metainfoBuilderCreate()
*
* @return false if the piece size isn't valid; eg, isn't a power of two.
*/
bool tr_metaInfoBuilderSetPieceSize(tr_metainfo_builder* builder, uint32_t bytes);
void tr_metaInfoBuilderFree(tr_metainfo_builder*);
/**
* @brief create a new torrent file
*
* This is actually done in a worker thread, not the main thread!
* Otherwise the client's interface would lock up while this runs.
*
* It is the caller's responsibility to poll builder->isDone
* from time to time! When the worker thread sets that flag,
* the caller must pass the builder to tr_metaInfoBuilderFree().
*
* @param outputFile if nullptr, builder->top + ".torrent" will be used.
* @param trackers An array of trackers, sorted by tier from first to last.
* NOTE: only the `tier' and `announce' fields are used.
*
* @param trackerCount size of the `trackers' array
*/
void tr_makeMetaInfo(
tr_metainfo_builder* builder,
char const* output_file,
tr_tracker_info const* trackers,
int n_trackers,
char const** webseeds,
int n_webseeds,
char const* comment,
bool is_private,
char const* source);