zipaccess.c
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:15k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * zipaccess.c: Module (access) to extract different archives, based on zlib
- *****************************************************************************
- * Copyright (C) 2009 the VideoLAN team
- * $Id: 63dcd22e43f69d602d98934893aac8b7dde1aa96 $
- *
- * Authors: Jean-Philippe André <jpeg@videolan.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.
- *****************************************************************************/
- /** @todo:
- * - implement crypto (using url zip://user:password@path-to-archive!/file)
- * - read files in zip with long name (use unz_file_info.size_filename)
- * - multi-volume archive support ?
- */
- #ifdef HAVE_CONFIG_H
- # include "config.h"
- #endif
- #include "zip.h"
- #include <vlc_access.h>
- /** **************************************************************************
- * This is our own access_sys_t for zip files
- *****************************************************************************/
- struct access_sys_t
- {
- /* zlib / unzip members */
- unzFile zipFile;
- zlib_filefunc_def *fileFunctions;
- /* file in zip information */
- char *psz_fileInzip;
- };
- static int AccessControl( access_t *p_access, int i_query, va_list args );
- static ssize_t AccessRead( access_t *, uint8_t *, size_t );
- static int AccessSeek( access_t *, int64_t );
- static int OpenFileInZip( access_t *p_access, int i_pos );
- static char *unescapeXml( const char *psz_text );
- /** **************************************************************************
- * brief Unescape valid XML string
- * The exact reverse of escapeToXml (zipstream.c)
- *****************************************************************************/
- static char *unescapeXml( const char *psz_text )
- {
- char *psz_ret = malloc( strlen( psz_text ) + 1 );
- if( !psz_ret ) return NULL;
- char *psz_tmp = psz_ret;
- for( char *psz_iter = (char*) psz_text; *psz_iter; ++psz_iter, ++psz_tmp )
- {
- if( *psz_iter == '?' )
- {
- int i_value;
- if( !sscanf( ++psz_iter, "%02x", &i_value ) )
- {
- /* Invalid number: URL incorrectly encoded */
- free( psz_ret );
- return NULL;
- }
- *psz_tmp = (char) i_value;
- psz_iter++;
- }
- else if( isAllowedChar( *psz_iter ) )
- {
- *psz_tmp = *psz_iter;
- }
- else
- {
- /* Invalid character encoding for the URL */
- free( psz_ret );
- return NULL;
- }
- }
- *psz_tmp = ' ';
- return psz_ret;
- }
- /** **************************************************************************
- * brief Open access
- *****************************************************************************/
- int AccessOpen( vlc_object_t *p_this )
- {
- access_t *p_access = (access_t*)p_this;
- access_sys_t *p_sys;
- int i_ret = VLC_EGENERIC;
- unzFile file = 0;
- char *psz_pathToZip = NULL, *psz_path = NULL, *psz_sep = NULL;
- if( !strstr( p_access->psz_path, ZIP_SEP ) )
- {
- msg_Dbg( p_access, "path does not contain separator " ZIP_SEP );
- return VLC_EGENERIC;
- }
- p_access->p_sys = p_sys = (access_sys_t*)
- calloc( 1, sizeof( access_sys_t ) );
- if( !p_sys )
- return VLC_ENOMEM;
- /* Split the MRL */
- psz_path = strdup( p_access->psz_path );
- psz_sep = strstr( psz_path, ZIP_SEP );
- *psz_sep = ' ';
- psz_pathToZip = unescapeXml( psz_path );
- if( !psz_pathToZip )
- {
- /* Maybe this was not an encoded string */
- msg_Dbg( p_access, "this is not an encoded url. Trying file '%s'",
- psz_path );
- psz_pathToZip = strdup( psz_path );
- }
- p_sys->psz_fileInzip = unescapeXml( psz_sep + ZIP_SEP_LEN );
- if( !p_sys->psz_fileInzip )
- {
- p_sys->psz_fileInzip = strdup( psz_sep + ZIP_SEP_LEN );
- }
- /* Define IO functions */
- zlib_filefunc_def *p_func = (zlib_filefunc_def*)
- calloc( 1, sizeof( zlib_filefunc_def ) );
- p_func->zopen_file = ZipIO_Open;
- p_func->zread_file = ZipIO_Read;
- p_func->zwrite_file = ZipIO_Write; // see comment
- p_func->ztell_file = ZipIO_Tell;
- p_func->zseek_file = ZipIO_Seek;
- p_func->zclose_file = ZipIO_Close;
- p_func->zerror_file = ZipIO_Error;
- p_func->opaque = p_access;
- /* Open zip archive */
- file = p_access->p_sys->zipFile = unzOpen2( psz_pathToZip, p_func );
- if( !file )
- {
- msg_Err( p_access, "not a valid zip archive: '%s'", psz_pathToZip );
- goto exit;
- }
- /* Open file in zip */
- OpenFileInZip( p_access, 0 );
- /* Set callback */
- ACCESS_SET_CALLBACKS( AccessRead, NULL, AccessControl, AccessSeek );
- /* Get some infos about current file. Maybe we could want some more ? */
- unz_file_info z_info;
- unzGetCurrentFileInfo( file, &z_info, NULL, 0, NULL, 0, NULL, 0 );
- /* Set access informations: size is needed for AccessSeek */
- p_access->info.i_size = z_info.uncompressed_size;
- p_access->info.i_pos = 0;
- p_access->info.b_eof = false;
- i_ret = VLC_SUCCESS;
- exit:
- if( i_ret != VLC_SUCCESS )
- {
- if( file )
- {
- unzCloseCurrentFile( file );
- unzClose( file );
- }
- free( p_sys->psz_fileInzip );
- free( p_sys->fileFunctions );
- free( p_sys );
- }
- free( psz_pathToZip );
- free( psz_path );
- return i_ret;
- }
- /** **************************************************************************
- * brief Close access: free structures
- *****************************************************************************/
- void AccessClose( vlc_object_t *p_this )
- {
- access_t *p_access = (access_t*)p_this;
- access_sys_t *p_sys = p_access->p_sys;
- if( p_sys )
- {
- unzFile file = p_sys->zipFile;
- if( file )
- {
- unzCloseCurrentFile( file );
- unzClose( file );
- }
- free( p_sys->psz_fileInzip );
- free( p_sys->fileFunctions );
- free( p_sys );
- }
- }
- /** **************************************************************************
- * brief Control access
- *****************************************************************************/
- static int AccessControl( access_t *p_access, int i_query, va_list args )
- {
- bool *pb_bool;
- int64_t *pi_64;
- switch( i_query )
- {
- /* */
- case ACCESS_CAN_SEEK:
- case ACCESS_CAN_PAUSE:
- case ACCESS_CAN_CONTROL_PACE:
- pb_bool = (bool*)va_arg( args, bool* );
- *pb_bool = true;
- break;
- case ACCESS_CAN_FASTSEEK:
- pb_bool = (bool*)va_arg( args, bool* );
- *pb_bool = false;
- break;
- case ACCESS_GET_PTS_DELAY:
- pi_64 = (int64_t*)va_arg( args, int64_t * );
- *pi_64 = DEFAULT_PTS_DELAY;
- break;
- /* */
- case ACCESS_SET_PAUSE_STATE:
- /* Nothing to do */
- break;
- case ACCESS_GET_TITLE_INFO:
- case ACCESS_SET_TITLE:
- case ACCESS_SET_SEEKPOINT:
- case ACCESS_SET_PRIVATE_ID_STATE:
- case ACCESS_GET_META:
- case ACCESS_GET_PRIVATE_ID_STATE:
- case ACCESS_GET_CONTENT_TYPE:
- return VLC_EGENERIC;
- default:
- msg_Warn( p_access, "unimplemented query %d in control", i_query );
- return VLC_EGENERIC;
- }
- return VLC_SUCCESS;
- }
- /** **************************************************************************
- * brief Read access
- * Reads current opened file in zip. This does not open the file in zip.
- * Return -1 if no data yet, 0 if no more data, else real data read
- *****************************************************************************/
- static ssize_t AccessRead( access_t *p_access, uint8_t *p_buffer, size_t sz )
- {
- access_sys_t *p_sys = p_access->p_sys;
- assert( p_sys );
- unzFile file = p_sys->zipFile;
- if( !file )
- {
- msg_Err( p_access, "archive not opened !" );
- return VLC_EGENERIC;
- }
- int i_read = 0;
- i_read = unzReadCurrentFile( file, p_buffer, sz );
- p_access->info.i_pos = unztell( file );
- return ( i_read >= 0 ? i_read : VLC_EGENERIC );
- }
- /** **************************************************************************
- * brief Seek inside zip file
- *****************************************************************************/
- static int AccessSeek( access_t *p_access, int64_t seek_len )
- {
- access_sys_t *p_sys = p_access->p_sys;
- assert( p_sys );
- unzFile file = p_sys->zipFile;
- if( !file )
- {
- msg_Err( p_access, "archive not opened !" );
- return VLC_EGENERIC;
- }
- /* Reopen file in zip if needed */
- if( p_access->info.i_pos != 0 )
- {
- OpenFileInZip( p_access, p_access->info.i_pos + seek_len );
- }
- /* Read seek_len data and drop it */
- int i_seek = 0;
- int i_read = 1;
- char *p_buffer = ( char* ) calloc( 1, ZIP_BUFFER_LEN );
- while( ( i_seek < seek_len ) && ( i_read > 0 ) )
- {
- i_read = ( seek_len - i_seek < ZIP_BUFFER_LEN )
- ? ( seek_len - i_seek ) : ZIP_BUFFER_LEN;
- i_read = unzReadCurrentFile( file, p_buffer, i_read );
- if( i_read < 0 )
- {
- msg_Warn( p_access, "could not seek in file" );
- free( p_buffer );
- return VLC_EGENERIC;
- }
- else
- {
- i_seek += i_read;
- }
- }
- free( p_buffer );
- p_access->info.i_pos = unztell( file );
- return VLC_SUCCESS;
- }
- /** **************************************************************************
- * brief Open file in zip
- *****************************************************************************/
- static int OpenFileInZip( access_t *p_access, int i_pos )
- {
- access_sys_t *p_sys = p_access->p_sys;
- unzFile file = p_sys->zipFile;
- if( !p_sys->psz_fileInzip )
- {
- return VLC_EGENERIC;
- }
- i_pos = __MIN( i_pos, 0 );
- p_access->info.i_pos = 0;
- unzCloseCurrentFile( file ); /* returns UNZ_PARAMERROR if file not opened */
- if( unzLocateFile( file, p_sys->psz_fileInzip, 0 ) != UNZ_OK )
- {
- msg_Err( p_access, "could not [re]locate file in zip: '%s'",
- p_sys->psz_fileInzip );
- return VLC_EGENERIC;
- }
- if( unzOpenCurrentFile( file ) != UNZ_OK )
- {
- msg_Err( p_access, "could not [re]open file in zip: '%s'",
- p_sys->psz_fileInzip );
- return VLC_EGENERIC;
- }
- if( i_pos > 0 )
- return AccessSeek( p_access, i_pos );
- else
- return VLC_SUCCESS;
- }
- /** **************************************************************************
- * brief I/O functions for the ioapi: open (read only)
- *****************************************************************************/
- static void* ZCALLBACK ZipIO_Open( void* opaque, const char* file, int mode )
- {
- assert(opaque != NULL);
- assert(mode == (ZLIB_FILEFUNC_MODE_READ | ZLIB_FILEFUNC_MODE_EXISTING));
- access_t *p_access = (access_t*) opaque;
- return stream_UrlNew( p_access, file );
- }
- /** **************************************************************************
- * brief I/O functions for the ioapi: read
- *****************************************************************************/
- static uLong ZCALLBACK ZipIO_Read( void* opaque, void* stream,
- void* buf, uLong size )
- {
- (void)opaque;
- //access_t *p_access = (access_t*) opaque;
- //msg_Dbg(p_access, "read %d", size);
- return stream_Read( (stream_t*) stream, buf, size );
- }
- /** **************************************************************************
- * brief I/O functions for the ioapi: write (assert insteadof segfault)
- *****************************************************************************/
- static uLong ZCALLBACK ZipIO_Write( void* opaque, void* stream,
- const void* buf, uLong size )
- {
- (void)opaque; (void)stream; (void)buf; (void)size;
- int zip_access_cannot_write_this_should_not_happen = 0;
- assert(zip_access_cannot_write_this_should_not_happen);
- return 0;
- }
- /** **************************************************************************
- * brief I/O functions for the ioapi: tell
- *****************************************************************************/
- static long ZCALLBACK ZipIO_Tell( void* opaque, void* stream )
- {
- (void)opaque;
- int64_t i64_tell = stream_Tell( (stream_t*) stream );
- //access_t *p_access = (access_t*) opaque;
- //msg_Dbg(p_access, "tell %" PRIu64, i64_tell);
- return (long)i64_tell;
- }
- /** **************************************************************************
- * brief I/O functions for the ioapi: seek
- *****************************************************************************/
- static long ZCALLBACK ZipIO_Seek( void* opaque, void* stream,
- uLong offset, int origin )
- {
- (void)opaque;
- //access_t *p_access = (access_t*) opaque;
- int64_t pos = offset;
- switch( origin )
- {
- case SEEK_CUR:
- pos += stream_Tell( (stream_t*) stream );
- break;
- case SEEK_SET:
- break;
- case SEEK_END:
- pos += stream_Size( (stream_t*) stream );
- break;
- default:
- return -1;
- }
- //msg_Dbg( p_access, "seek (%d,%d): %" PRIu64, offset, origin, pos );
- stream_Seek( (stream_t*) stream, pos );
- /* Note: in unzip.c, unzlocal_SearchCentralDir seeks to the end of
- the stream, which is doable but returns an error in VLC.
- That's why we always assume this was OK. FIXME */
- return 0;
- }
- /** **************************************************************************
- * brief I/O functions for the ioapi: close
- *****************************************************************************/
- static int ZCALLBACK ZipIO_Close( void* opaque, void* stream )
- {
- (void)opaque;
- stream_Delete( (stream_t*) stream );
- return 0;
- }
- /** **************************************************************************
- * brief I/O functions for the ioapi: test error (man 3 ferror)
- *****************************************************************************/
- static int ZCALLBACK ZipIO_Error( void* opaque, void* stream )
- {
- (void)opaque;
- (void)stream;
- //msg_Dbg( p_access, "error" );
- return 0;
- }