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mpv/stream/rar.c
wm4 3fc3bf70f9 stream: add uncompressed rar support 
Apparently, it is popular to store large files in uncompressed rar
archives. Extracting files is not practical, and some media players
suport playing directly from uncompressed rar (at least VLC and some
DirectShow components).

Storing or accessing files this way is completely idiotic, but it is
a common practice, and the ones subjected to this practice can't do
much to change this (at least that's what I assume/hope). Also, it's
a feature request, so we say yes.

This code is mostly taken from VLC (commit f6e7240 from their git tree).
We also copy the way this is done: opening a rar file by itself yields
a playlist, which contains URLs to the actual entries in the rar file.
Compressed entries are simply skipped.
2013-08-26 10:09:46 +02:00

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/*****************************************************************************
* rar.c: uncompressed RAR parser
*****************************************************************************
* Copyright (C) 2008-2010 Laurent Aimar
* $Id: f368245f4260f913f5c211e09b7dd511a96525e6 $
*
* Author: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include <assert.h>
#include <limits.h>
#include <stdio.h>
#include <libavutil/intreadwrite.h>
#include "mpvcore/mp_common.h"
#include "mpvcore/mp_talloc.h"
#include "stream.h"
#include "rar.h"
static const uint8_t rar_marker[] = {
0x52, 0x61, 0x72, 0x21, 0x1a, 0x07, 0x00
};
static const int rar_marker_size = sizeof(rar_marker);
void RarFileDelete(rar_file_t *file)
{
for (int i = 0; i < file->chunk_count; i++) {
free(file->chunk[i]->mrl);
free(file->chunk[i]);
}
talloc_free(file->chunk);
free(file->name);
free_stream(file->s);
free(file);
}
typedef struct {
uint16_t crc;
uint8_t type;
uint16_t flags;
uint16_t size;
uint32_t add_size;
} rar_block_t;
enum {
RAR_BLOCK_MARKER = 0x72,
RAR_BLOCK_ARCHIVE = 0x73,
RAR_BLOCK_FILE = 0x74,
RAR_BLOCK_SUBBLOCK = 0x7a,
RAR_BLOCK_END = 0x7b,
};
enum {
RAR_BLOCK_END_HAS_NEXT = 0x0001,
};
enum {
RAR_BLOCK_FILE_HAS_PREVIOUS = 0x0001,
RAR_BLOCK_FILE_HAS_NEXT = 0x0002,
RAR_BLOCK_FILE_HAS_HIGH = 0x0100,
};
static int PeekBlock(struct stream *s, rar_block_t *hdr)
{
bstr data = stream_peek(s, 11);
const uint8_t *peek = (uint8_t *)data.start;
int peek_size = data.len;
if (peek_size < 7)
return -1;
hdr->crc = AV_RL16(&peek[0]);
hdr->type = peek[2];
hdr->flags = AV_RL16(&peek[3]);
hdr->size = AV_RL16(&peek[5]);
hdr->add_size = 0;
if ((hdr->flags & 0x8000) ||
hdr->type == RAR_BLOCK_FILE ||
hdr->type == RAR_BLOCK_SUBBLOCK) {
if (peek_size < 11)
return -1;
hdr->add_size = AV_RL32(&peek[7]);
}
if (hdr->size < 7)
return -1;
return 0;
}
static int SkipBlock(struct stream *s, const rar_block_t *hdr)
{
uint64_t size = (uint64_t)hdr->size + hdr->add_size;
while (size > 0) {
int skip = MPMIN(size, INT_MAX);
if (!stream_skip(s, skip))
return -1;
size -= skip;
}
return 0;
}
static int IgnoreBlock(struct stream *s, int block)
{
/* */
rar_block_t bk;
if (PeekBlock(s, &bk) || bk.type != block)
return -1;
return SkipBlock(s, &bk);
}
static int SkipEnd(struct stream *s, const rar_block_t *hdr)
{
if (!(hdr->flags & RAR_BLOCK_END_HAS_NEXT))
return -1;
if (SkipBlock(s, hdr))
return -1;
/* Now, we need to look for a marker block,
* It seems that there is garbage at EOF */
for (;;) {
bstr peek = stream_peek(s, rar_marker_size);
if (peek.len < rar_marker_size)
return -1;
if (!memcmp(peek.start, rar_marker, rar_marker_size))
break;
if (!stream_skip(s, 1))
return -1;
}
/* Skip marker and archive blocks */
if (IgnoreBlock(s, RAR_BLOCK_MARKER))
return -1;
if (IgnoreBlock(s, RAR_BLOCK_ARCHIVE))
return -1;
return 0;
}
static int SkipFile(struct stream *s, int *count, rar_file_t ***file,
const rar_block_t *hdr, const char *volume_mrl)
{
int min_size = 7+21;
if (hdr->flags & RAR_BLOCK_FILE_HAS_HIGH)
min_size += 8;
if (hdr->size < (unsigned)min_size)
return -1;
bstr data = stream_peek(s, min_size);
if (data.len < min_size)
return -1;
const uint8_t *peek = (uint8_t *)data.start;
/* */
uint32_t file_size_low = AV_RL32(&peek[7+4]);
uint8_t method = peek[7+18];
uint16_t name_size = AV_RL16(&peek[7+19]);
uint32_t file_size_high = 0;
if (hdr->flags & RAR_BLOCK_FILE_HAS_HIGH)
file_size_high = AV_RL32(&peek[7+29]);
const uint64_t file_size = ((uint64_t)file_size_high << 32) | file_size_low;
char *name = calloc(1, name_size + 1);
if (!name)
return -1;
const int name_offset = (hdr->flags & RAR_BLOCK_FILE_HAS_HIGH) ? (7+33) : (7+25);
if (name_offset + name_size <= hdr->size) {
const int max_size = name_offset + name_size;
bstr data = stream_peek(s, max_size);
if (data.len < max_size) {
free(name);
return -1;
}
memcpy(name, &data.start[name_offset], name_size);
}
rar_file_t *current = NULL;
if (method != 0x30) {
mp_msg(MSGT_STREAM, MSGL_WARN, "Ignoring compressed file %s (method=0x%2.2x)\n", name, method);
goto exit;
}
/* */
if( *count > 0 )
current = (*file)[*count - 1];
if (current &&
(current->is_complete ||
strcmp(current->name, name) ||
(hdr->flags & RAR_BLOCK_FILE_HAS_PREVIOUS) == 0))
current = NULL;
if (!current) {
if (hdr->flags & RAR_BLOCK_FILE_HAS_PREVIOUS)
goto exit;
current = calloc(1, sizeof(*current));
if (!current)
goto exit;
MP_TARRAY_APPEND(NULL, *file, *count, current);
current->name = name;
current->size = file_size;
current->is_complete = false;
current->real_size = 0;
current->chunk_count = 0;
current->chunk = NULL;
name = NULL;
}
/* Append chunks */
rar_file_chunk_t *chunk = malloc(sizeof(*chunk));
if (chunk) {
chunk->mrl = strdup(volume_mrl);
chunk->offset = stream_tell(s) + hdr->size;
chunk->size = hdr->add_size;
chunk->cummulated_size = 0;
if (current->chunk_count > 0) {
rar_file_chunk_t *previous = current->chunk[current->chunk_count-1];
chunk->cummulated_size += previous->cummulated_size +
previous->size;
}
MP_TARRAY_APPEND(NULL, current->chunk, current->chunk_count, chunk);
current->real_size += hdr->add_size;
}
if ((hdr->flags & RAR_BLOCK_FILE_HAS_NEXT) == 0)
current->is_complete = true;
exit:
/* */
free(name);
/* We stop on the first non empty file if we cannot seek */
if (current) {
bool can_seek = s->end_pos > 0;
if (!can_seek && current->size > 0)
return -1;
}
if (SkipBlock(s, hdr))
return -1;
return 0;
}
int RarProbe(struct stream *s)
{
bstr peek = stream_peek(s, rar_marker_size);
if (peek.len < rar_marker_size)
return -1;
if (memcmp(peek.start, rar_marker, rar_marker_size))
return -1;
return 0;
}
typedef struct {
const char *match;
const char *format;
int start;
int stop;
} rar_pattern_t;
static const rar_pattern_t *FindVolumePattern(const char *location)
{
static const rar_pattern_t patterns[] = {
{ ".part1.rar", "%s.part%.1d.rar", 2, 9 },
{ ".part01.rar", "%s.part%.2d.rar", 2, 99, },
{ ".part001.rar", "%s.part%.3d.rar", 2, 999 },
{ ".rar", "%s.%c%.2d", 0, 999 },
{ NULL, NULL, 0, 0 },
};
const size_t location_size = strlen(location);
for (int i = 0; patterns[i].match != NULL; i++) {
const size_t match_size = strlen(patterns[i].match);
if (location_size < match_size)
continue;
if (!strcmp(&location[location_size - match_size], patterns[i].match))
return &patterns[i];
}
return NULL;
}
int RarParse(struct stream *s, int *count, rar_file_t ***file)
{
*count = 0;
*file = NULL;
const rar_pattern_t *pattern = FindVolumePattern(s->url);
int volume_offset = 0;
char *volume_mrl;
if (asprintf(&volume_mrl, "%s", s->url) < 0)
return -1;
struct stream *vol = s;
for (;;) {
/* Skip marker & archive */
if (IgnoreBlock(vol, RAR_BLOCK_MARKER) ||
IgnoreBlock(vol, RAR_BLOCK_ARCHIVE)) {
if (vol != s)
free_stream(vol);
free(volume_mrl);
return -1;
}
/* */
int has_next = -1;
for (;;) {
rar_block_t bk;
int ret;
if (PeekBlock(vol, &bk))
break;
switch(bk.type) {
case RAR_BLOCK_END:
ret = SkipEnd(vol, &bk);
has_next = ret && (bk.flags & RAR_BLOCK_END_HAS_NEXT);
break;
case RAR_BLOCK_FILE:
ret = SkipFile(vol, count, file, &bk, volume_mrl);
break;
default:
ret = SkipBlock(vol, &bk);
break;
}
if (ret)
break;
}
if (has_next < 0 && *count > 0 && !(*file)[*count -1]->is_complete)
has_next = 1;
if (vol != s)
free_stream(vol);
if (!has_next || !pattern)
goto done;
/* Open next volume */
const int volume_index = pattern->start + volume_offset++;
if (volume_index > pattern->stop)
goto done;
char *volume_base;
if (asprintf(&volume_base, "%.*s",
(int)(strlen(s->url) - strlen(pattern->match)), s->url) < 0) {
goto done;
}
free(volume_mrl);
if (pattern->start) {
if (asprintf(&volume_mrl, pattern->format, volume_base, volume_index) < 0)
volume_mrl = NULL;
} else {
if (asprintf(&volume_mrl, pattern->format, volume_base,
'r' + volume_index / 100, volume_index % 100) < 0)
volume_mrl = NULL;
}
free(volume_base);
if (!volume_mrl)
goto done;
vol = stream_create(volume_mrl, STREAM_READ | STREAM_NO_FILTERS, s->opts);
if (!vol)
goto done;
}
done:
free(volume_mrl);
if (*count == 0) {
talloc_free(*file);
return -1;
}
return 0;
}
int RarSeek(rar_file_t *file, uint64_t position)
{
if (position > file->real_size)
position = file->real_size;
/* Search the chunk */
const rar_file_chunk_t *old_chunk = file->current_chunk;
for (int i = 0; i < file->chunk_count; i++) {
file->current_chunk = file->chunk[i];
if (position < file->current_chunk->cummulated_size + file->current_chunk->size)
break;
}
file->i_pos = position;
const uint64_t offset = file->current_chunk->offset +
(position - file->current_chunk->cummulated_size);
if (strcmp(old_chunk->mrl, file->current_chunk->mrl)) {
if (file->s)
free_stream(file->s);
file->s = stream_create(file->current_chunk->mrl,
STREAM_READ | STREAM_NO_FILTERS,
file->opts);
}
return file->s ? stream_seek(file->s, offset) : 0;
}
ssize_t RarRead(rar_file_t *file, void *data, size_t size)
{
size_t total = 0;
while (total < size) {
const uint64_t chunk_end = file->current_chunk->cummulated_size + file->current_chunk->size;
int max = MPMIN(MPMIN((int64_t)(size - total), (int64_t)(chunk_end - file->i_pos)), INT_MAX);
if (max <= 0)
break;
int r = file->s ? stream_read(file->s, data, max) : -1;
if (r <= 0)
break;
total += r;
if( data )
data = (char *)data + r;
file->i_pos += r;
if (file->i_pos >= chunk_end &&
RarSeek(file, file->i_pos))
break;
}
return total;
}
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