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/*
* Copyright 2003-2016 The Music Player Daemon Project
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/**
* iso archive handling (requires cdio, and iso9660)
*/
#include "config.h"
#include "Iso9660ArchivePlugin.hxx"
#include "../ArchivePlugin.hxx"
#include "../ArchiveFile.hxx"
#include "../ArchiveVisitor.hxx"
#include "input/InputStream.hxx"
#include "input/InputPlugin.hxx"
#include "fs/Path.hxx"
#include "util/RefCount.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include <cdio/iso9660.h>
#include <stdlib.h>
#include <string.h>
#define CEILING(x, y) ((x+(y-1))/y)
class Iso9660ArchiveFile final : public ArchiveFile {
RefCount ref;
iso9660_t *iso;
public:
Iso9660ArchiveFile(iso9660_t *_iso)
:ArchiveFile(iso9660_archive_plugin), iso(_iso) {}
~Iso9660ArchiveFile() {
iso9660_close(iso);
}
void Ref() {
ref.Increment();
}
void Unref() {
if (ref.Decrement())
delete this;
}
long SeekRead(void *ptr, lsn_t start, long int i_size) const {
return iso9660_iso_seek_read(iso, ptr, start, i_size);
}
void Visit(const char *path, ArchiveVisitor &visitor);
virtual void Close() override {
Unref();
}
virtual void Visit(ArchiveVisitor &visitor) override;
virtual InputStream *OpenStream(const char *path,
Mutex &mutex, Cond &cond,
Error &error) override;
};
static constexpr Domain iso9660_domain("iso9660");
/* archive open && listing routine */
inline void
Iso9660ArchiveFile::Visit(const char *psz_path, ArchiveVisitor &visitor)
{
CdioList_t *entlist;
CdioListNode_t *entnode;
iso9660_stat_t *statbuf;
char pathname[4096];
entlist = iso9660_ifs_readdir (iso, psz_path);
if (!entlist) {
return;
}
/* Iterate over the list of nodes that iso9660_ifs_readdir gives */
_CDIO_LIST_FOREACH (entnode, entlist) {
statbuf = (iso9660_stat_t *) _cdio_list_node_data (entnode);
strcpy(pathname, psz_path);
strcat(pathname, statbuf->filename);
if (iso9660_stat_s::_STAT_DIR == statbuf->type ) {
if (strcmp(statbuf->filename, ".") && strcmp(statbuf->filename, "..")) {
strcat(pathname, "/");
Visit(pathname, visitor);
}
} else {
//remove leading /
visitor.VisitArchiveEntry(pathname + 1);
}
}
_cdio_list_free (entlist, true);
}
static ArchiveFile *
iso9660_archive_open(Path pathname, Error &error)
{
/* open archive */
auto iso = iso9660_open(pathname.c_str());
if (iso == nullptr) {
error.Format(iso9660_domain,
"Failed to open ISO9660 file %s",
pathname.c_str());
return nullptr;
}
return new Iso9660ArchiveFile(iso);
}
void
Iso9660ArchiveFile::Visit(ArchiveVisitor &visitor)
{
Visit("/", visitor);
}
/* single archive handling */
class Iso9660InputStream final : public InputStream {
Iso9660ArchiveFile &archive;
iso9660_stat_t *statbuf;
public:
Iso9660InputStream(Iso9660ArchiveFile &_archive, const char *_uri,
Mutex &_mutex, Cond &_cond,
iso9660_stat_t *_statbuf)
:InputStream(_uri, _mutex, _cond),
archive(_archive), statbuf(_statbuf) {
size = statbuf->size;
SetReady();
archive.Ref();
}
~Iso9660InputStream() {
free(statbuf);
archive.Unref();
}
/* virtual methods from InputStream */
bool IsEOF() override;
size_t Read(void *ptr, size_t size, Error &error) override;
};
InputStream *
Iso9660ArchiveFile::OpenStream(const char *pathname,
Mutex &mutex, Cond &cond,
Error &error)
{
auto statbuf = iso9660_ifs_stat_translate(iso, pathname);
if (statbuf == nullptr) {
error.Format(iso9660_domain,
"not found in the ISO file: %s", pathname);
return nullptr;
}
return new Iso9660InputStream(*this, pathname, mutex, cond,
statbuf);
}
size_t
Iso9660InputStream::Read(void *ptr, size_t read_size, Error &error)
{
int readed = 0;
int no_blocks, cur_block;
size_t left_bytes = statbuf->size - offset;
if (left_bytes < read_size) {
no_blocks = CEILING(left_bytes, ISO_BLOCKSIZE);
} else {
no_blocks = read_size / ISO_BLOCKSIZE;
}
if (no_blocks == 0)
return 0;
cur_block = offset / ISO_BLOCKSIZE;
readed = archive.SeekRead(ptr, statbuf->lsn + cur_block,
no_blocks);
if (readed != no_blocks * ISO_BLOCKSIZE) {
error.Format(iso9660_domain,
"error reading ISO file at lsn %lu",
(unsigned long)cur_block);
return 0;
}
if (left_bytes < read_size) {
readed = left_bytes;
}
offset += readed;
return readed;
}
bool
Iso9660InputStream::IsEOF()
{
return offset == size;
}
/* exported structures */
static const char *const iso9660_archive_extensions[] = {
"iso",
nullptr
};
const ArchivePlugin iso9660_archive_plugin = {
"iso",
nullptr,
nullptr,
iso9660_archive_open,
iso9660_archive_extensions,
};
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