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/* the Music Player Daemon (MPD)
* Copyright (C) 2008 Viliam Mateicka <viliam.mateicka@gmail.com>
* This project's homepage is: http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "archive_api.h"
#include "archive_list.h"
#include "input_archive.h"
#include "input_stream.h"
#include "gcc.h"
#include "log.h"
#include "ls.h"
#include <stdbool.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <assert.h>
#include <glib.h>
typedef struct {
const struct archive_plugin *aplugin;
const struct input_plugin *iplugin;
struct archive_file *file;
} archive_context;
/**
* select correct archive plugin to handle the input stream
* may allow stacking of archive plugins. for example for handling
* tar.gz a gzip handler opens file (through inputfile stream)
* then it opens a tar handler and sets gzip inputstream as
* parent_stream so tar plugin fetches file data from gzip
* plugin and gzip fetches file from disk
*/
static bool
input_archive_open(struct input_stream *is, const char *pathname)
{
archive_context *arch_ctx;
const struct archive_plugin *arplug;
char *archive, *filename, *suffix, *pname;
bool opened;
if (pathname[0] != '/')
return false;
pname = g_strdup(pathname);
// archive_lookup will modify pname when true is returned
if (!archive_lookup(pname, &archive, &filename, &suffix)) {
g_debug("not an archive, lookup %s failed\n", pname);
g_free(pname);
return false;
}
//check which archive plugin to use (by ext)
arplug = archive_plugin_from_suffix(suffix);
if (!arplug) {
g_warning("can't handle archive %s\n",archive);
g_free(pname);
return false;
}
arch_ctx = (archive_context *) g_malloc(sizeof(archive_context));
//setup archive plugin pointer
arch_ctx->aplugin = arplug;
//open archive file
arch_ctx->file = arplug->open(archive);
//setup fileops
arplug->setup_stream(arch_ctx->file, is);
//setup input plugin backup
arch_ctx->iplugin = is->plugin;
is->plugin = &input_plugin_archive;
//internal handle
is->data = arch_ctx;
//open archive
opened = arch_ctx->iplugin->open(is, filename);
if (!opened) {
g_warning("open inarchive file %s failed\n\n",filename);
} else {
is->ready = true;
}
g_free(pname);
return opened;
}
static void
input_archive_close(struct input_stream *is)
{
archive_context *arch_ctx = (archive_context *)is->data;
//close archive infile ops
arch_ctx->iplugin->close(is);
//close archive
arch_ctx->aplugin->close(arch_ctx->file);
//free private data
g_free(arch_ctx);
}
static bool
input_archive_seek(struct input_stream *is, off_t offset, int whence)
{
archive_context *arch_ctx = (archive_context *)is->data;
return arch_ctx->iplugin->seek(is, offset, whence);
}
static size_t
input_archive_read(struct input_stream *is, void *ptr, size_t size)
{
archive_context *arch_ctx = (archive_context *)is->data;
assert(ptr != NULL);
assert(size > 0);
return arch_ctx->iplugin->read(is, ptr, size);
}
static bool
input_archive_eof(struct input_stream *is)
{
archive_context *arch_ctx = (archive_context *)is->data;
return arch_ctx->iplugin->eof(is);
}
static int
input_archive_buffer(struct input_stream *is)
{
archive_context *arch_ctx = (archive_context *)is->data;
return arch_ctx->iplugin->buffer(is);
}
const struct input_plugin input_plugin_archive = {
.open = input_archive_open,
.close = input_archive_close,
.buffer = input_archive_buffer,
.read = input_archive_read,
.eof = input_archive_eof,
.seek = input_archive_seek,
};
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