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physfs/src/archiver_iso9660.c

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/*
* ISO9660 support routines for PhysicsFS.
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Christoph Nelles.
*/
/* !!! FIXME: this file needs Ryanification. */
/*
* Handles CD-ROM disk images (and raw CD-ROM devices).
*
* Not supported:
* - RockRidge
* - Non 2048 Sectors
* - UDF
*
* Deviations from the standard
* - Ignores mandatory sort order
* - Allows various invalid file names
*
* Problems
* - Ambiguities in the standard
*/
#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
#if PHYSFS_SUPPORTS_ISO9660
#include <time.h>
/* cache files smaller than this completely in memory */
#define ISO9660_FULLCACHEMAXSIZE 2048
/* !!! FIXME: this is going to cause trouble. */
#pragma pack(push) /* push current alignment to stack */
#pragma pack(1) /* set alignment to 1 byte boundary */
/* This is the format as defined by the standard
typedef struct
{
PHYSFS_uint32 lsb;
PHYSFS_uint32 msb;
} ISOBB32bit; // 32byte Both Byte type, means the value first in LSB then in MSB
typedef struct
{
PHYSFS_uint16 lsb;
PHYSFS_uint16 msb;
} ISOBB16bit; // 16byte Both Byte type, means the value first in LSB then in MSB
*/
/* define better ones to simplify coding (less if's) */
#if PHYSFS_BYTEORDER == PHYSFS_LIL_ENDIAN
#define ISOBB32bit(name) PHYSFS_uint32 name; PHYSFS_uint32 __dummy_##name;
#define ISOBB16bit(name) PHYSFS_uint16 name; PHYSFS_uint16 __dummy_##name;
#else
#define ISOBB32bit(name) PHYSFS_uint32 __dummy_##name; PHYSFS_uint32 name;
#define ISOBB16bit(name) PHYSFS_uint16 __dummy_##name; PHYSFS_uint16 name;
#endif
typedef struct
{
char year[4];
char month[2];
char day[2];
char hour[2];
char minute[2];
char second[2];
char centisec[2];
PHYSFS_sint8 offset; /* in 15min from GMT */
} ISO9660VolumeTimestamp;
typedef struct
{
PHYSFS_uint8 year;
PHYSFS_uint8 month;
PHYSFS_uint8 day;
PHYSFS_uint8 hour;
PHYSFS_uint8 minute;
PHYSFS_uint8 second;
PHYSFS_sint8 offset;
} ISO9660FileTimestamp;
typedef struct
{
unsigned existence:1;
unsigned directory:1;
unsigned associated_file:1;
unsigned record:1;
unsigned protection:1;
unsigned reserved:2;
unsigned multiextent:1;
} ISO9660FileFlags;
typedef struct
{
PHYSFS_uint8 length;
PHYSFS_uint8 attribute_length;
ISOBB32bit(extent_location)
ISOBB32bit(data_length)
ISO9660FileTimestamp timestamp;
ISO9660FileFlags file_flags;
PHYSFS_uint8 file_unit_size;
PHYSFS_uint8 gap_size;
ISOBB16bit(vol_seq_no)
PHYSFS_uint8 len_fi;
char unused;
} ISO9660RootDirectoryRecord;
/* this structure is combined for all Volume descriptor types */
typedef struct
{
PHYSFS_uint8 type;
char identifier[5];
PHYSFS_uint8 version;
PHYSFS_uint8 flags;
char system_identifier[32];
char volume_identifier[32];
char unused2[8];
ISOBB32bit(space_size)
PHYSFS_uint8 escape_sequences[32];
ISOBB16bit(vol_set_size)
ISOBB16bit(vol_seq_no)
ISOBB16bit(block_size)
ISOBB32bit(path_table_size)
/* PHYSFS_uint32 path_table_start_lsb; // why didn't they use both byte type?
PHYSFS_uint32 opt_path_table_start_lsb;
PHYSFS_uint32 path_table_start_msb;
PHYSFS_uint32 opt_path_table_start_msb;*/
#if PHYSFS_BYTEORDER == PHYSFS_LIL_ENDIAN
PHYSFS_uint32 path_table_start;
PHYSFS_uint32 opt_path_table_start;
PHYSFS_uint32 unused6;
PHYSFS_uint32 unused7;
#else
PHYSFS_uint32 unused6;
PHYSFS_uint32 unused7;
PHYSFS_uint32 path_table_start;
PHYSFS_uint32 opt_path_table_start;
#endif
ISO9660RootDirectoryRecord rootdirectory;
char set_identifier[128];
char publisher_identifier[128];
char preparer_identifer[128];
char application_identifier[128];
char copyright_file_identifier[37];
char abstract_file_identifier[37];
char bibliographic_file_identifier[37];
ISO9660VolumeTimestamp creation_timestamp;
ISO9660VolumeTimestamp modification_timestamp;
ISO9660VolumeTimestamp expiration_timestamp;
ISO9660VolumeTimestamp effective_timestamp;
PHYSFS_uint8 file_structure_version;
char unused4;
char application_use[512];
char unused5[653];
} ISO9660VolumeDescriptor;
typedef struct
{
PHYSFS_uint8 recordlen;
PHYSFS_uint8 extattributelen;
ISOBB32bit(extentpos)
ISOBB32bit(datalen)
ISO9660FileTimestamp recordtime;
ISO9660FileFlags flags;
PHYSFS_uint8 file_unit_size;
PHYSFS_uint8 interleave_gap;
ISOBB16bit(volseqno)
PHYSFS_uint8 filenamelen;
char filename[222]; /* This is not exact, but makes reading easier */
} ISO9660FileDescriptor;
typedef struct
{
ISOBB16bit(owner)
ISOBB16bit(group)
PHYSFS_uint16 flags; /* not implemented*/
ISO9660VolumeTimestamp create_time; /* yes, not file timestamp */
ISO9660VolumeTimestamp mod_time;
ISO9660VolumeTimestamp expire_time;
ISO9660VolumeTimestamp effective_time;
PHYSFS_uint8 record_format;
PHYSFS_uint8 record_attributes;
ISOBB16bit(record_len)
char system_identifier[32];
char system_use[64];
PHYSFS_uint8 version;
ISOBB16bit(escape_len)
char reserved[64];
/** further fields not implemented */
} ISO9660ExtAttributeRec;
#pragma pack(pop) /* restore original alignment from stack */
typedef struct
{
PHYSFS_Io *io;
PHYSFS_uint32 rootdirstart;
PHYSFS_uint32 rootdirsize;
PHYSFS_uint64 currpos;
int isjoliet;
char *path;
void *mutex;
} ISO9660Handle;
typedef struct __ISO9660FileHandle
{
PHYSFS_sint64 filesize;
PHYSFS_uint64 currpos;
PHYSFS_uint64 startblock;
ISO9660Handle *isohandle;
PHYSFS_uint32 (*read) (struct __ISO9660FileHandle *filehandle, void *buffer,
PHYSFS_uint64 len);
int (*seek)(struct __ISO9660FileHandle *filehandle, PHYSFS_sint64 offset);
void (*close)(struct __ISO9660FileHandle *filehandle);
/* !!! FIXME: anonymouse union is going to cause problems. */
union
{
/* !!! FIXME: just use a memory PHYSFS_Io here, unify all this code. */
char *cacheddata; /* data of file when cached */
PHYSFS_Io *io; /* handle to separate opened file */
};
} ISO9660FileHandle;
/*******************************************************************************
* Time conversion functions
******************************************************************************/
static PHYSFS_sint64 iso_mktime(ISO9660FileTimestamp *timestamp)
{
struct tm tm;
tm.tm_year = timestamp->year;
tm.tm_mon = timestamp->month - 1;
tm.tm_mday = timestamp->day;
tm.tm_hour = timestamp->hour;
tm.tm_min = timestamp->minute;
tm.tm_sec = timestamp->second;
/* Ignore GMT offset for now... */
return mktime(&tm);
} /* iso_mktime */
static int iso_atoi2(char *text)
{
return ((text[0] - 40) * 10) + (text[1] - 40);
} /* iso_atoi2 */
static int iso_atoi4(char *text)
{
return ((text[0] - 40) * 1000) + ((text[1] - 40) * 100) +
((text[2] - 40) * 10) + (text[3] - 40);
} /* iso_atoi4 */
static PHYSFS_sint64 iso_volume_mktime(ISO9660VolumeTimestamp *timestamp)
{
PHYSFS_sint64 value;
struct tm tm;
tm.tm_year = iso_atoi4(timestamp->year);
tm.tm_mon = iso_atoi2(timestamp->month) - 1;
tm.tm_mday = iso_atoi2(timestamp->day);
tm.tm_hour = iso_atoi2(timestamp->hour);
tm.tm_min = iso_atoi2(timestamp->minute);
tm.tm_sec = iso_atoi2(timestamp->second);
/* this allows values outside the range of a unix timestamp... sanitize them */
value = mktime(&tm);
return value == -1 ? 0 : value;
} /* iso_volume_mktime */
/*******************************************************************************
* Filename extraction
******************************************************************************/
static int iso_extractfilenameISO(ISO9660FileDescriptor *descriptor,
char *filename, int *version)
{
*filename = '\0';
if (descriptor->flags.directory)
{
strncpy(filename, descriptor->filename, descriptor->filenamelen);
filename[descriptor->filenamelen] = '\0';
*version = 0;
} /* if */
else
{
/* find last SEPARATOR2 */
int pos = 0;
int lastfound = -1;
for(;pos < descriptor->filenamelen; pos++)
if (descriptor->filename[pos] == ';')
lastfound = pos;
BAIL_IF(lastfound < 1, PHYSFS_ERR_NOT_FOUND /* !!! FIXME: PHYSFS_ERR_BAD_FILENAME */, -1);
BAIL_IF(lastfound == (descriptor->filenamelen -1), PHYSFS_ERR_NOT_FOUND /* !!! PHYSFS_ERR_BAD_FILENAME */, -1);
strncpy(filename, descriptor->filename, lastfound);
if (filename[lastfound - 1] == '.')
filename[lastfound - 1] = '\0'; /* consume trailing ., as done in all implementations */
else
filename[lastfound] = '\0';
*version = atoi(descriptor->filename + lastfound);
} /* else */
return 0;
} /* iso_extractfilenameISO */
static int iso_extractfilenameUCS2(ISO9660FileDescriptor *descriptor,
char *filename, int *version)
{
PHYSFS_uint16 tmp[128];
PHYSFS_uint16 *src;
int len;
*filename = '\0';
*version = 1; /* Joliet does not have versions.. at least not on my images */
src = (PHYSFS_uint16*) descriptor->filename;
len = descriptor->filenamelen / 2;
tmp[len] = 0;
while(len--)
tmp[len] = PHYSFS_swapUBE16(src[len]);
PHYSFS_utf8FromUcs2(tmp, filename, 255);
return 0;
} /* iso_extractfilenameUCS2 */
static int iso_extractfilename(ISO9660Handle *handle,
ISO9660FileDescriptor *descriptor, char *filename,int *version)
{
if (handle->isjoliet)
return iso_extractfilenameUCS2(descriptor, filename, version);
else
return iso_extractfilenameISO(descriptor, filename, version);
} /* iso_extractfilename */
/*******************************************************************************
* Basic image read functions
******************************************************************************/
static int iso_readimage(ISO9660Handle *handle, PHYSFS_uint64 where,
void *buffer, PHYSFS_uint64 len)
{
int rc = -1;
BAIL_IF_ERRPASS(!__PHYSFS_platformGrabMutex(handle->mutex), -1);
if (where != handle->currpos)
GOTO_IF_ERRPASS(!handle->io->seek(handle->io,where), unlockme);
rc = handle->io->read(handle->io, buffer, len);
if (rc == -1)
{
handle->currpos = (PHYSFS_uint64) -1;
goto unlockme;
} /* if */
handle->currpos += rc;
unlockme:
__PHYSFS_platformReleaseMutex(handle->mutex);
return rc;
} /* iso_readimage */
static PHYSFS_sint64 iso_readfiledescriptor(ISO9660Handle *handle,
PHYSFS_uint64 where,
ISO9660FileDescriptor *descriptor)
{
PHYSFS_sint64 rc = iso_readimage(handle, where, descriptor,
sizeof (descriptor->recordlen));
BAIL_IF_ERRPASS(rc == -1, -1);
BAIL_IF(rc != 1, PHYSFS_ERR_CORRUPT, -1);
if (descriptor->recordlen == 0)
return 0; /* fill bytes at the end of a sector */
rc = iso_readimage(handle, where + 1, &descriptor->extattributelen,
descriptor->recordlen - sizeof(descriptor->recordlen));
BAIL_IF_ERRPASS(rc == -1, -1);
BAIL_IF(rc != 1, PHYSFS_ERR_CORRUPT, -1);
return 0;
} /* iso_readfiledescriptor */
static void iso_extractsubpath(char *path, char **subpath)
{
*subpath = strchr(path,'/');
if (*subpath != 0)
{
**subpath = 0;
*subpath +=1;
} /* if */
} /* iso_extractsubpath */
/*
* Don't use path tables, they are not necessarily faster, but more complicated
* to implement as they store only directories and not files, so searching for
* a file needs to branch to the directory extent sooner or later.
*/
static int iso_find_dir_entry(ISO9660Handle *handle,const char *path,
ISO9660FileDescriptor *descriptor)
{
char *subpath = 0;
PHYSFS_uint64 readpos, end_of_dir;
char filename[255];
char pathcopy[256];
char *mypath;
int version = 0;
strcpy(pathcopy, path);
mypath = pathcopy;
readpos = handle->rootdirstart;
end_of_dir = handle->rootdirstart + handle->rootdirsize;
iso_extractsubpath(mypath, &subpath);
while (1)
{
BAIL_IF_ERRPASS(iso_readfiledescriptor(handle, readpos, descriptor), -1);
/* recordlen = 0 -> no more entries or fill entry */
if (!descriptor->recordlen)
{
/* if we are in the last sector of the directory & it's 0 -> end */
if ((end_of_dir - 2048) <= (readpos -1))
break; /* finished */
/* else skip to the next sector & continue; */
readpos = (((readpos - 1) / 2048) + 1) * 2048;
continue;
} /* if */
readpos += descriptor->recordlen;
if (descriptor->filenamelen == 1 && (descriptor->filename[0] == 0
|| descriptor->filename[0] == 1))
continue; /* special ones, ignore */
BAIL_IF_ERRPASS(iso_extractfilename(handle, descriptor, filename, &version), -1);
if (strcmp(filename, mypath) == 0)
{
if ( (subpath == 0) || (subpath[0] == 0) )
return 0; /* no subpaths left and we found the entry */
if (descriptor->flags.directory)
{
/* shorten the path to the subpath */
mypath = subpath;
iso_extractsubpath(mypath, &subpath);
/* gosub to the new directory extent */
readpos = descriptor->extentpos * 2048;
end_of_dir = readpos + descriptor->datalen;
} /* if */
else
{
/* !!! FIXME: set PHYSFS_ERR_NOT_FOUND? */
/* we're at a file but have a remaining subpath -> no match */
return 0;
} /* else */
} /* if */
} /* while */
/* !!! FIXME: set PHYSFS_ERR_NOT_FOUND? */
return 0;
} /* iso_find_dir_entry */
static int iso_read_ext_attributes(ISO9660Handle *handle, int block,
ISO9660ExtAttributeRec *attributes)
{
return iso_readimage(handle, block * 2048, attributes,
sizeof(ISO9660ExtAttributeRec));
} /* iso_read_ext_attributes */
static int ISO9660_flush(PHYSFS_Io *io) { return 1; /* no write support. */ }
static PHYSFS_Io *ISO9660_duplicate(PHYSFS_Io *_io)
{
BAIL(PHYSFS_ERR_UNSUPPORTED, NULL); /* !!! FIXME: write me. */
} /* ISO9660_duplicate */
static void ISO9660_destroy(PHYSFS_Io *io)
{
ISO9660FileHandle *fhandle = (ISO9660FileHandle*) io->opaque;
fhandle->close(fhandle);
allocator.Free(io);
} /* ISO9660_destroy */
static PHYSFS_sint64 ISO9660_read(PHYSFS_Io *io, void *buf, PHYSFS_uint64 len)
{
ISO9660FileHandle *fhandle = (ISO9660FileHandle*) io->opaque;
return fhandle->read(fhandle, buf, len);
} /* ISO9660_read */
static PHYSFS_sint64 ISO9660_write(PHYSFS_Io *io, const void *b, PHYSFS_uint64 l)
{
BAIL(PHYSFS_ERR_READ_ONLY, -1);
} /* ISO9660_write */
static PHYSFS_sint64 ISO9660_tell(PHYSFS_Io *io)
{
return ((ISO9660FileHandle*) io->opaque)->currpos;
} /* ISO9660_tell */
static int ISO9660_seek(PHYSFS_Io *io, PHYSFS_uint64 offset)
{
ISO9660FileHandle *fhandle = (ISO9660FileHandle*) io->opaque;
return fhandle->seek(fhandle, offset);
} /* ISO9660_seek */
static PHYSFS_sint64 ISO9660_length(PHYSFS_Io *io)
{
return ((ISO9660FileHandle*) io->opaque)->filesize;
} /* ISO9660_length */
static const PHYSFS_Io ISO9660_Io =
{
CURRENT_PHYSFS_IO_API_VERSION, NULL,
ISO9660_read,
ISO9660_write,
ISO9660_seek,
ISO9660_tell,
ISO9660_length,
ISO9660_duplicate,
ISO9660_flush,
ISO9660_destroy
};
/*******************************************************************************
* Archive management functions
******************************************************************************/
static void *ISO9660_openArchive(PHYSFS_Io *io, const char *filename, int forWriting)
{
char magicnumber[6];
ISO9660Handle *handle;
int founddescriptor = 0;
int foundjoliet = 0;
assert(io != NULL); /* shouldn't ever happen. */
BAIL_IF(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
/* Skip system area to magic number in Volume descriptor */
BAIL_IF_ERRPASS(!io->seek(io, 32769), NULL);
BAIL_IF_ERRPASS(io->read(io, magicnumber, 5) != 5, NULL);
if (memcmp(magicnumber, "CD001", 6) != 0)
BAIL(PHYSFS_ERR_UNSUPPORTED, NULL);
handle = allocator.Malloc(sizeof(ISO9660Handle));
GOTO_IF(!handle, PHYSFS_ERR_OUT_OF_MEMORY, errorcleanup);
handle->path = 0;
handle->mutex= 0;
handle->io = NULL;
handle->path = allocator.Malloc(strlen(filename) + 1);
GOTO_IF(!handle->path, PHYSFS_ERR_OUT_OF_MEMORY, errorcleanup);
strcpy(handle->path, filename);
handle->mutex = __PHYSFS_platformCreateMutex();
GOTO_IF_ERRPASS(!handle->mutex, errorcleanup);
handle->io = io;
/* seek Primary Volume Descriptor */
GOTO_IF_ERRPASS(!io->seek(io, 32768), errorcleanup);
while (1)
{
ISO9660VolumeDescriptor descriptor;
GOTO_IF_ERRPASS(io->read(io, &descriptor, sizeof(ISO9660VolumeDescriptor)) != sizeof(ISO9660VolumeDescriptor), errorcleanup);
GOTO_IF(strncmp(descriptor.identifier, "CD001", 5) != 0, PHYSFS_ERR_UNSUPPORTED, errorcleanup);
if (descriptor.type == 255)
{
/* type 255 terminates the volume descriptor list */
if (founddescriptor)
return handle; /* ok, we've found one volume descriptor */
else
GOTO(PHYSFS_ERR_CORRUPT, errorcleanup);
} /* if */
if (descriptor.type == 1 && !founddescriptor)
{
handle->currpos = io->tell(io);
handle->rootdirstart =
descriptor.rootdirectory.extent_location * 2048;
handle->rootdirsize =
descriptor.rootdirectory.data_length;
handle->isjoliet = 0;
founddescriptor = 1; /* continue search for joliet */
} /* if */
if (descriptor.type == 2 && !foundjoliet)
{
/* check if is joliet */
PHYSFS_uint8 *s = descriptor.escape_sequences;
int joliet = !(descriptor.flags & 1)
&& (s[0] == 0x25)
&& (s[1] == 0x2F)
&& ((s[2] == 0x40) || (s[2] == 0x43) || (s[2] == 0x45));
if (!joliet)
continue;
handle->currpos = io->tell(io);
handle->rootdirstart =
descriptor.rootdirectory.extent_location * 2048;
handle->rootdirsize =
descriptor.rootdirectory.data_length;
handle->isjoliet = 1;
founddescriptor = 1;
foundjoliet = 1;
} /* if */
} /* while */
GOTO(PHYSFS_ERR_CORRUPT, errorcleanup); /* not found. */
errorcleanup:
if (handle)
{
if (handle->path)
allocator.Free(handle->path);
if (handle->mutex)
__PHYSFS_platformDestroyMutex(handle->mutex);
allocator.Free(handle);
} /* if */
return NULL;
} /* ISO9660_openArchive */
static void ISO9660_closeArchive(void *opaque)
{
ISO9660Handle *handle = (ISO9660Handle*) opaque;
handle->io->destroy(handle->io);
__PHYSFS_platformDestroyMutex(handle->mutex);
allocator.Free(handle->path);
allocator.Free(handle);
} /* ISO9660_closeArchive */
/*******************************************************************************
* Read functions
******************************************************************************/
static PHYSFS_uint32 iso_file_read_mem(ISO9660FileHandle *filehandle,
void *buffer, PHYSFS_uint64 len)
{
/* check remaining bytes & max obj which can be fetched */
const PHYSFS_sint64 bytesleft = filehandle->filesize - filehandle->currpos;
if (bytesleft < len)
len = bytesleft;
if (len == 0)
return 0;
memcpy(buffer, filehandle->cacheddata + filehandle->currpos, (size_t) len);
filehandle->currpos += len;
return (PHYSFS_uint32) len;
} /* iso_file_read_mem */
static int iso_file_seek_mem(ISO9660FileHandle *fhandle, PHYSFS_sint64 offset)
{
BAIL_IF(offset < 0, PHYSFS_ERR_INVALID_ARGUMENT, 0);
BAIL_IF(offset >= fhandle->filesize, PHYSFS_ERR_PAST_EOF, 0);
fhandle->currpos = offset;
return 0;
} /* iso_file_seek_mem */
static void iso_file_close_mem(ISO9660FileHandle *fhandle)
{
allocator.Free(fhandle->cacheddata);
allocator.Free(fhandle);
} /* iso_file_close_mem */
static PHYSFS_uint32 iso_file_read_foreign(ISO9660FileHandle *filehandle,
void *buffer, PHYSFS_uint64 len)
{
PHYSFS_sint64 rc;
/* check remaining bytes & max obj which can be fetched */
const PHYSFS_sint64 bytesleft = filehandle->filesize - filehandle->currpos;
if (bytesleft < len)
len = bytesleft;
rc = filehandle->io->read(filehandle->io, buffer, len);
BAIL_IF_ERRPASS(rc == -1, -1);
filehandle->currpos += rc; /* i trust my internal book keeping */
BAIL_IF(rc < len, PHYSFS_ERR_CORRUPT, -1);
return rc;
} /* iso_file_read_foreign */
static int iso_file_seek_foreign(ISO9660FileHandle *fhandle,
PHYSFS_sint64 offset)
{
PHYSFS_sint64 pos;
BAIL_IF(offset < 0, PHYSFS_ERR_INVALID_ARGUMENT, 0);
BAIL_IF(offset >= fhandle->filesize, PHYSFS_ERR_PAST_EOF, 0);
pos = fhandle->startblock * 2048 + offset;
BAIL_IF_ERRPASS(!fhandle->io->seek(fhandle->io, pos), -1);
fhandle->currpos = offset;
return 0;
} /* iso_file_seek_foreign */
static void iso_file_close_foreign(ISO9660FileHandle *fhandle)
{
fhandle->io->destroy(fhandle->io);
allocator.Free(fhandle);
} /* iso_file_close_foreign */
static int iso_file_open_mem(ISO9660Handle *handle, ISO9660FileHandle *fhandle)
{
int rc;
fhandle->cacheddata = allocator.Malloc(fhandle->filesize);
BAIL_IF(!fhandle->cacheddata, PHYSFS_ERR_OUT_OF_MEMORY, -1);
rc = iso_readimage(handle, fhandle->startblock * 2048,
fhandle->cacheddata, fhandle->filesize);
GOTO_IF_ERRPASS(rc < 0, freemem);
GOTO_IF(rc == 0, PHYSFS_ERR_CORRUPT, freemem);
fhandle->read = iso_file_read_mem;
fhandle->seek = iso_file_seek_mem;
fhandle->close = iso_file_close_mem;
return 0;
freemem:
allocator.Free(fhandle->cacheddata);
return -1;
} /* iso_file_open_mem */
static int iso_file_open_foreign(ISO9660Handle *handle,
ISO9660FileHandle *fhandle)
{
fhandle->io = __PHYSFS_createNativeIo(handle->path, 'r');
BAIL_IF_ERRPASS(!fhandle->io, -1);
if (!fhandle->io->seek(fhandle->io, fhandle->startblock * 2048))
{
fhandle->io->destroy(fhandle->io);
return -1;
} /* if */
fhandle->read = iso_file_read_foreign;
fhandle->seek = iso_file_seek_foreign;
fhandle->close = iso_file_close_foreign;
return 0;
} /* iso_file_open_foreign */
static PHYSFS_Io *ISO9660_openRead(void *opaque, const char *filename)
{
PHYSFS_Io *retval = NULL;
ISO9660Handle *handle = (ISO9660Handle*) opaque;
ISO9660FileHandle *fhandle;
ISO9660FileDescriptor descriptor;
int rc;
fhandle = allocator.Malloc(sizeof(ISO9660FileHandle));
BAIL_IF(fhandle == 0, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
fhandle->cacheddata = 0;
retval = allocator.Malloc(sizeof(PHYSFS_Io));
GOTO_IF(retval == 0, PHYSFS_ERR_OUT_OF_MEMORY, errorhandling);
/* find file descriptor */
rc = iso_find_dir_entry(handle, filename, &descriptor);
GOTO_IF_ERRPASS(rc, errorhandling);
fhandle->startblock = descriptor.extentpos + descriptor.extattributelen;
fhandle->filesize = descriptor.datalen;
fhandle->currpos = 0;
fhandle->isohandle = handle;
fhandle->cacheddata = NULL;
fhandle->io = NULL;
if (descriptor.datalen <= ISO9660_FULLCACHEMAXSIZE)
rc = iso_file_open_mem(handle, fhandle);
else
rc = iso_file_open_foreign(handle, fhandle);
GOTO_IF_ERRPASS(rc, errorhandling);
memcpy(retval, &ISO9660_Io, sizeof (PHYSFS_Io));
retval->opaque = fhandle;
return retval;
errorhandling:
if (retval) allocator.Free(retval);
if (fhandle) allocator.Free(fhandle);
return NULL;
} /* ISO9660_openRead */
/*******************************************************************************
* Information gathering functions
******************************************************************************/
static void ISO9660_enumerateFiles(void *opaque, const char *dname,
PHYSFS_EnumFilesCallback cb,
const char *origdir, void *callbackdata)
{
ISO9660Handle *handle = (ISO9660Handle*) opaque;
ISO9660FileDescriptor descriptor;
PHYSFS_uint64 readpos;
PHYSFS_uint64 end_of_dir;
char filename[130]; /* ISO allows 31, Joliet 128 -> 128 + 2 eol bytes */
int version = 0;
if (*dname == '\0')
{
readpos = handle->rootdirstart;
end_of_dir = readpos + handle->rootdirsize;
} /* if */
else
{
printf("pfad %s\n",dname);
BAIL_IF_ERRPASS(iso_find_dir_entry(handle,dname, &descriptor),);
BAIL_IF_ERRPASS(!descriptor.flags.directory,);
readpos = descriptor.extentpos * 2048;
end_of_dir = readpos + descriptor.datalen;
} /* else */
while (1)
{
BAIL_IF_ERRPASS(iso_readfiledescriptor(handle, readpos, &descriptor), );
/* recordlen = 0 -> no more entries or fill entry */
if (!descriptor.recordlen)
{
/* if we are in the last sector of the directory & it's 0 -> end */
if ((end_of_dir - 2048) <= (readpos -1))
break; /* finished */
/* else skip to the next sector & continue; */
readpos = (((readpos - 1) / 2048) + 1) * 2048;
continue;
} /* if */
readpos += descriptor.recordlen;
if (descriptor.filenamelen == 1 && (descriptor.filename[0] == 0
|| descriptor.filename[0] == 1))
continue; /* special ones, ignore */
strncpy(filename,descriptor.filename,descriptor.filenamelen);
iso_extractfilename(handle, &descriptor, filename, &version);
cb(callbackdata, origdir,filename);
} /* while */
} /* ISO9660_enumerateFiles */
static int ISO9660_stat(void *opaque, const char *name, PHYSFS_Stat *stat)
{
ISO9660Handle *handle = (ISO9660Handle*) opaque;
ISO9660FileDescriptor descriptor;
ISO9660ExtAttributeRec extattr;
BAIL_IF_ERRPASS(iso_find_dir_entry(handle, name, &descriptor), -1);
stat->readonly = 1;
/* try to get extended info */
if (descriptor.extattributelen)
{
BAIL_IF_ERRPASS(iso_read_ext_attributes(handle,
descriptor.extentpos, &extattr), -1);
stat->createtime = iso_volume_mktime(&extattr.create_time);
stat->modtime = iso_volume_mktime(&extattr.mod_time);
stat->accesstime = iso_volume_mktime(&extattr.mod_time);
} /* if */
else
{
stat->createtime = iso_mktime(&descriptor.recordtime);
stat->modtime = iso_mktime(&descriptor.recordtime);
stat->accesstime = iso_mktime(&descriptor.recordtime);
} /* else */
if (descriptor.flags.directory)
{
stat->filesize = 0;
stat->filetype = PHYSFS_FILETYPE_DIRECTORY;
} /* if */
else
{
stat->filesize = descriptor.datalen;
stat->filetype = PHYSFS_FILETYPE_REGULAR;
} /* else */
return 1;
} /* ISO9660_stat */
/*******************************************************************************
* Not supported functions
******************************************************************************/
static PHYSFS_Io *ISO9660_openWrite(void *opaque, const char *name)
{
BAIL(PHYSFS_ERR_READ_ONLY, NULL);
} /* ISO9660_openWrite */
static PHYSFS_Io *ISO9660_openAppend(void *opaque, const char *name)
{
BAIL(PHYSFS_ERR_READ_ONLY, NULL);
} /* ISO9660_openAppend */
static int ISO9660_remove(void *opaque, const char *name)
{
BAIL(PHYSFS_ERR_READ_ONLY, 0);
} /* ISO9660_remove */
static int ISO9660_mkdir(void *opaque, const char *name)
{
BAIL(PHYSFS_ERR_READ_ONLY, 0);
} /* ISO9660_mkdir */
const PHYSFS_Archiver __PHYSFS_Archiver_ISO9660 =
{
CURRENT_PHYSFS_ARCHIVER_API_VERSION,
{
"ISO",
"ISO9660 image file",
"Christoph Nelles <evilazrael@evilazrael.de>",
"https://www.evilazrael.de/",
0, /* supportsSymlinks */
},
ISO9660_openArchive,
ISO9660_enumerateFiles,
ISO9660_openRead,
ISO9660_openWrite,
ISO9660_openAppend,
ISO9660_remove,
ISO9660_mkdir,
ISO9660_stat,
ISO9660_closeArchive
};
#endif /* defined PHYSFS_SUPPORTS_ISO9660 */
/* end of archiver_iso9660.c ... */
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