| /*␊ |
| * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.␊ |
| *␊ |
| * @APPLE_LICENSE_HEADER_START@␊ |
| * ␊ |
| * Copyright (c) 1999-2004 Apple Computer, Inc. All Rights Reserved.␊ |
| * ␊ |
| * This file contains Original Code and/or Modifications of Original Code␊ |
| * as defined in and that are subject to the Apple Public Source License␊ |
| * Version 2.0 (the 'License'). You may not use this file except in␊ |
| * compliance with the License. Please obtain a copy of the License at␊ |
| * http://www.opensource.apple.com/apsl/ and read it before using this␊ |
| * file.␊ |
| * ␊ |
| * The Original Code and all software distributed under the License are␊ |
| * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
| * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
| * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
| * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.␊ |
| * Please see the License for the specific language governing rights and␊ |
| * limitations under the License.␊ |
| * ␊ |
| * @APPLE_LICENSE_HEADER_END@␊ |
| */␊ |
| /*␊ |
| * dmazar, 14/7/2011␊ |
| * support for EXFAT volume label reading␊ |
| * EXFAT info from: http://www.ntfs.com/exfat-overview.htm␊ |
| *␊ |
| * EXFAT shares partition type with NTFS (0x7) and easiest way of␊ |
| * adding it was through ntfs.c module. All functions here are called␊ |
| * from similar ntfs.c funcs as fallback (if not NTFS, maybe it's EXFAT).␊ |
| */␊ |
| ␊ |
| #include "libsaio.h"␊ |
| #include "sl.h"␊ |
| ␊ |
| #ifndef DEBUG_EXFAT␊ |
| #define DEBUG_EXFAT 0␊ |
| #endif␊ |
| ␊ |
| #if DEBUG_EXFAT␊ |
| #define DBG(x...)␉␉printf(x)␊ |
| #define PAUSE()␉␉␉getchar()␊ |
| #else␊ |
| #define DBG(x...)␊ |
| #define PAUSE()␊ |
| #endif␊ |
| ␊ |
| #define␉EXFAT_BBID␉"EXFAT "␊ |
| #define␉EXFAT_BBIDLEN␉8␊ |
| ␊ |
| #define MAX_BLOCK_SIZE␉␉4096␊ |
| #define MAX_CLUSTER_SIZE␉32 * 1024 * 1024␊ |
| ␊ |
| #define ERROR -1␊ |
| ␊ |
| ␊ |
| /*␊ |
| * boot sector of the partition␊ |
| * http://www.ntfs.com/exfat-boot-sector.htm␊ |
| */␊ |
| struct exfatbootfile {␊ |
| ␉u_int8_t reserved1[3];␉/* JumpBoot: 0xEB7690 */␊ |
| ␉u_int8_t bf_sysid[8];␉/* FileSystemName: 'EXFAT ' */␊ |
| ␉u_int8_t reserved2[53];␉/* MustBeZero */␊ |
| ␉u_int64_t bf_prtoff;␉␉/* PartitionOffset: In sectors; if 0, shall be ignored */␊ |
| ␉u_int64_t bf_vollen;␉␉/* VolumeLength: Size of exFAT volume in sectors */␊ |
| ␉u_int32_t bf_fatoff;␉␉/* FatOffset: In sectors */␊ |
| ␉u_int32_t bf_fatlen;␉␉/* FatLength: In sectors. May exceed the required space in order to align the second FAT */␊ |
| ␉u_int32_t bf_cloff;␉␉/* ClusterHeapOffset: In sectors. */␊ |
| ␉u_int32_t bf_clcnt;␉␉/* ClusterCount: 2^32-11 is the maximum number of clusters could be described. */␊ |
| ␉u_int32_t bf_rdircl;␉␉/* RootDirectoryCluster. */␊ |
| ␉u_int32_t bf_volsn;␉␉/* VolumeSerialNumber. */␊ |
| ␉u_int16_t bf_fsrev;␉␉/* FileSystemRevision: as MAJOR.minor, major revision is high byte, minor is low byte; currently 01.00. */␊ |
| ␉u_int16_t bf_volflags;␉/* VolumeFlags. */␊ |
| ␉u_int8_t bf_bpss;␉␉/* BytesPerSectorShift: Power of 2. Minimum 9 (512 bytes per sector), maximum 12 (4096 bytes per sector) */␊ |
|
| ␉u_int8_t bf_nfats;␉␉/* NumberOfFats: 2 is for TexFAT only */␊ |
| ␉u_int8_t bf_drvs;␉␉/* DriveSelect: Extended INT 13h drive number; typically 0x80 */␊ |
|
| ␉u_int8_t reserved3[7];␉/* Reserved */␊ |
| ␉u_int8_t bootcode[390];␉/* BootCode */␊ |
| ␉u_int16_t bf_bsig;␉␉/* BootSignature: 0xAA55 */␊ |
| };␊ |
| ␊ |
| struct direntry_label {␊ |
| ␉u_int8_t type;␉␉␉/* EntryType: 0x83 (or 0x03 if label is empty) */␊ |
| ␉u_int8_t llen;␉␉␉/* CharacterCount: Length in Unicode characters (max 11) */␊ |
| ␉u_int16_t label[11];␉␉/* VolumeLabel: Unicode characters (max 11) */␊ |
| ␉u_int8_t reserved1[8];␉/* Reserved */␊ |
| };␊ |
| ␊ |
| ␊ |
| /**␊ |
| * Reads volume label into str.␊ |
| * Reads boot sector, performs dome checking, loads root dir␊ |
| * and parses volume label.␊ |
| */␊ |
| void␊ |
| EXFATGetDescription(CICell ih, char *str, long strMaxLen)␊ |
| {␊ |
| struct exfatbootfile *boot;␊ |
| u_int32_t bytesPerSector = 0;␊ |
| u_int32_t sectorsPerCluster = 0;␊ |
| long long rdirOffset = 0;␊ |
| char *buf = NULL;␊ |
| struct direntry_label *dire = NULL;␊ |
| int loopControl = 0;␊ |
| ␊ |
| DBG("EXFAT: start %x:%x\n", ih->biosdev, ih->part_no);␊ |
| ␉␊ |
| buf = (char *)malloc(MAX_BLOCK_SIZE);␊ |
| if (buf == 0)␊ |
| {␊ |
| goto error;␊ |
| }␊ |
| ␊ |
| /*␊ |
| * Read the boot sector, check signatures, and do some minimal␊ |
| * sanity checking. NOTE: the size of the read below is intended␊ |
| * to be a multiple of all supported block sizes, so we don't␊ |
| * have to determine or change the device's block size.␊ |
| */␊ |
| Seek(ih, 0);␊ |
| Read(ih, (long)buf, MAX_BLOCK_SIZE);␊ |
| ␊ |
| // take our boot structure␊ |
| boot = (struct exfatbootfile *) buf;␊ |
| ␊ |
| /*␊ |
| * The first three bytes are an Intel x86 jump instruction. I assume it␊ |
| * can be the same forms as DOS FAT:␊ |
| * 0xE9 0x?? 0x??␊ |
| * 0xEC 0x?? 0x90␊ |
| * where 0x?? means any byte value is OK.␊ |
| */␊ |
| if (boot->reserved1[0] != 0xE9␊ |
| && (boot->reserved1[0] != 0xEB || boot->reserved1[2] != 0x90))␊ |
| {␊ |
| goto error;␊ |
| }␊ |
| ␊ |
| // Check the "EXFAT " signature.␊ |
| if (memcmp((const char *)boot->bf_sysid, EXFAT_BBID, EXFAT_BBIDLEN) != 0)␊ |
| {␊ |
| goto error;␊ |
| }␊ |
| ␊ |
| /*␊ |
| * Make sure the bytes per sector and sectors per cluster are␊ |
| * powers of two, and within reasonable ranges.␊ |
| */␊ |
| bytesPerSector = 1 << boot->bf_bpss;␉/* Just one byte; no swapping needed */␊ |
| DBG("EXFAT: bpss=%d, bytesPerSector=%d\n", boot->bf_bpss, bytesPerSector);␊ |
| if (boot->bf_bpss < 9 || boot->bf_bpss > 12)␊ |
| {␊ |
| DBG("EXFAT: invalid bytes per sector shift(%d)\n", boot->bf_bpss);␊ |
| goto error;␊ |
| }␊ |
| ␊ |
| sectorsPerCluster = 1 << boot->bf_spcs;␉/* Just one byte; no swapping needed */␊ |
| DBG("EXFAT: spcs=%d, sectorsPerCluster=%d\n", boot->bf_spcs, sectorsPerCluster);␊ |
| if (boot->bf_spcs > (25 - boot->bf_bpss))␊ |
| {␊ |
| DBG("EXFAT: invalid sectors per cluster shift (%d)\n", boot->bf_spcs);␊ |
| goto error;␊ |
| }␊ |
| ␊ |
| // calculate root dir cluster offset␊ |
| rdirOffset = boot->bf_cloff + (boot->bf_rdircl - 2) * sectorsPerCluster;␊ |
| DBG("EXFAT: rdirOffset=%d\n", rdirOffset);␊ |
| ␊ |
| // load MAX_BLOCK_SIZE bytes of root dir␊ |
| Seek(ih, rdirOffset * bytesPerSector);␊ |
| Read(ih, (long)buf, MAX_BLOCK_SIZE);␊ |
| DBG("buf 0 1 2 = %x %x %x\n", 0x00ff & buf[0], 0x00ff & buf[1], 0x00ff & buf[2]);␊ |
| ␊ |
| str[0] = '\0';␊ |
| ␊ |
| /*␊ |
| * Search for volume label dir entry (type 0x83), convert from unicode and put to str.␊ |
| * Set loopControl var to avoid searching outside of buf.␊ |
| */␊ |
| loopControl = MAX_BLOCK_SIZE / sizeof(struct direntry_label);␊ |
| dire = (struct direntry_label *)buf;␊ |
| while (loopControl && dire->type && dire->type != 0x83)␊ |
| {␊ |
| dire++;␊ |
| loopControl--;␊ |
| }␊ |
| if (dire->type == 0x83 && dire->llen > 0 && dire->llen <= 11)␊ |
| {␊ |
| utf_encodestr( dire->label, (int)dire->llen, (u_int8_t *)str, strMaxLen, OSLittleEndian );␊ |
| }␊ |
| DBG("EXFAT: label=%s\n", str);␊ |
| ␊ |
| free(buf);␊ |
| PAUSE();␊ |
| return;␊ |
| ␊ |
| error:␊ |
| if (buf) free(buf);␊ |
| DBG("EXFAT: error\n");␊ |
| PAUSE();␊ |
| return;␊ |
| }␊ |
| ␊ |
| /**␊ |
| * Sets UUID to uuidStr.␊ |
| * Reads the boot sector, does some checking, generates UUID␊ |
| * (like the one you get on Windows???)␊ |
| */␊ |
| long EXFATGetUUID(CICell ih, char *uuidStr)␊ |
| {␊ |
| struct exfatbootfile *boot;␊ |
| void *buf = malloc(MAX_BLOCK_SIZE);␊ |
| if ( !buf )␊ |
| return -1;␊ |
| ␊ |
| /*␊ |
| * Read the boot sector, check signatures, and do some minimal␊ |
| * sanity checking.␉ NOTE: the size of the read below is intended␊ |
| * to be a multiple of all supported block sizes, so we don't␊ |
| * have to determine or change the device's block size.␊ |
| */␊ |
| Seek(ih, 0);␊ |
| Read(ih, (long)buf, MAX_BLOCK_SIZE);␊ |
| ␊ |
| boot = (struct exfatbootfile *) buf;␊ |
| ␊ |
| /*␊ |
| * Check the "EXFAT " signature.␊ |
| */␊ |
| if (memcmp((const char *)boot->bf_sysid, EXFAT_BBID, EXFAT_BBIDLEN) != 0)␊ |
| return -1;␊ |
| ␊ |
| // Check for non-null volume serial number␊ |
| if( !boot->bf_volsn )␊ |
| return -1;␊ |
| ␊ |
| // Use UUID like the one you get on Windows␊ |
| sprintf(uuidStr, "%04X-%04X", (unsigned short)(boot->bf_volsn >> 16) & 0xFFFF,␊ |
| (unsigned short)boot->bf_volsn & 0xFFFF);␊ |
| ␊ |
| DBG("EXFATGetUUID: %x:%x = %s\n", ih->biosdev, ih->part_no, uuidStr);␊ |
| return 0;␊ |
| } ␊ |
| ␊ |
| /**␊ |
| * Returns true if given buffer is the boot rec of the EXFAT volume.␊ |
| */␊ |
| bool EXFATProbe(const void * buffer)␊ |
| {␊ |
| bool result = false;␊ |
| ␊ |
| // boot sector structure␊ |
| const struct exfatbootfile␉* boot = buffer;␊ |
| ␊ |
| // Looking for EXFAT signature.␊ |
| if (memcmp((const char *)boot->bf_sysid, EXFAT_BBID, EXFAT_BBIDLEN) == 0)␊ |
| result = true;␊ |
| ␉␊ |
| DBG("EXFATProbe: %d\n", result ? 1 : 0);␊ |
| return result;␊ |
| }␊ |
