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macpartitions.cc
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/*
* macpartitions.c
*
* see header file for more infos
*
* Note on editor settings: indentation is done with TABs only (no blanks)
*
* Note: This current implementation can only read files if they are not too much fragmented.
* This means: If the file has more than 8 fragments (=extents), it can't be accessed
* entirely. If this happens, an error message will be printed to the iPod screen.
* Unfortunately, this also applies to the catalog file (directory), but hopefully the
* iPod can't be filled with so many files that this ever happens.
*/
#pragma pack (1)
extern "C" {
#include "bootloader.h"
#include "ata2.h"
#include "fat32.h"
#include "ext2.h"
#include "fwfs.h"
#include "vfs.h"
#include "minilibc.h"
#include "macpartitions.h"
}
/* Macros for swapping values */
#define OSSwapConstInt16(x) \
((uint16)((((uint16)(x) & 0xff00) >> 8) | \
(((uint16)(x) & 0x00ff) << 8)))
#define OSSwapConstInt32(x) \
((uint32)((((uint32)(x) & 0xff000000) >> 24) | \
(((uint32)(x) & 0x00ff0000) >> 8) | \
(((uint32)(x) & 0x0000ff00) << 8) | \
(((uint32)(x) & 0x000000ff) << 24)))
#define OSSwapConstInt64(x) \
((uint64)((((uint64)(x) & 0xff00000000000000ULL) >> 56) | \
(((uint64)(x) & 0x00ff000000000000ULL) >> 40) | \
(((uint64)(x) & 0x0000ff0000000000ULL) >> 24) | \
(((uint64)(x) & 0x000000ff00000000ULL) >> 8) | \
(((uint64)(x) & 0x00000000ff000000ULL) << 8) | \
(((uint64)(x) & 0x0000000000ff0000ULL) << 24) | \
(((uint64)(x) & 0x000000000000ff00ULL) << 40) | \
(((uint64)(x) & 0x00000000000000ffULL) << 56)))
#if !ONPC
// we are Little Endian
#define LITTLE_ENDIAN_DECL(TYPE, SWAPPER) typedef TYPE TYPE##le
#define BIG_ENDIAN_DECL(TYPE, SWAPPER) \
class TYPE##be { public: \
TYPE##be & operator = (TYPE arg) { this->endianSwappedVal = SWAPPER(arg); return *this; } \
operator TYPE() const { return SWAPPER(this->endianSwappedVal); } \
private: TYPE endianSwappedVal; }
#else
// we are Big Endian
#define BIG_ENDIAN_DECL(TYPE, SWAPPER) typedef TYPE TYPE##be
#define LITTLE_ENDIAN_DECL(TYPE, SWAPPER) \
class TYPE##le { public: \
TYPE##le & operator = (TYPE arg) { this->endianSwappedVal = SWAPPER(arg); return *this; } \
operator TYPE() const { return SWAPPER(this->endianSwappedVal); } \
private: TYPE endianSwappedVal; }
#endif
//LITTLE_ENDIAN_DECL(uint64, OSSwapConstInt64); // uint64le
LITTLE_ENDIAN_DECL(uint32, OSSwapConstInt32); // uint32le
LITTLE_ENDIAN_DECL(int32, OSSwapConstInt32); // int32le
LITTLE_ENDIAN_DECL(uint16, OSSwapConstInt16); // uint16le
LITTLE_ENDIAN_DECL(int16, OSSwapConstInt16); // int16le
//BIG_ENDIAN_DECL(uint64, OSSwapConstInt64); // uint64be
BIG_ENDIAN_DECL(uint32, OSSwapConstInt32); // uint32be
BIG_ENDIAN_DECL(int32, OSSwapConstInt32); // int32be
BIG_ENDIAN_DECL(uint16, OSSwapConstInt16); // uint16be
BIG_ENDIAN_DECL(int16, OSSwapConstInt16); // int16be
/* Partition Map Entry */
struct MacPart {
char pmSig[2]; /* unique value for map entry blk */
int16be pmSigPad; /* currently unused */
int32be pmMapBlkCnt; /* # of blks in partition map */
int32be pmPyPartStart; /* physical start blk of partition */
int32be pmPartBlkCnt; /* # of blks in this partition */
char pmPartName[32]; /* ASCII partition name */
char pmParType[32]; /* ASCII partition type */
int32be pmLgDataStart; /* log. # of partition's 1st data blk */
int32be pmDataCnt; /* # of blks in partition's data area */
int32be pmPartStatus; /* bit field for partition status */
int32be pmLgBootStart; /* log. blk of partition's boot code */
int32be pmBootSize; /* number of bytes in boot code */
int32be pmBootAddr; /* memory load address of boot code */
int32be pmBootAddr2; /* currently unused */
int32be pmBootEntry; /* entry point of boot code */
int32be pmBootEntry2; /* currently unused */
int32be pmBootCksum; /* checksum of boot code */
uint8 pmProcessor[16]; /* ASCII for the processor type */
uint8 pmPad[376];
};
static void hfsplus_newfs (uint8 part, uint32 offset);
static uint8 *gBlkBuf = 0;
extern "C" void check_mac_partitions (uint8 *blk0)
/*
* used references:
* http://developer.apple.com/technotes/tn/tn1189.html#SecretsOfThePartitionMap
*/
{
int blkNo = 1; // first part map entry block number
int partBlkCount = 1; // number of part map blocks - we will update it below once we know the proper value
int err;
if (sizeof (MacPart) != 512) {
mlc_printf ("!Internal err: macpart size: %d\n", sizeof (MacPart));
mlc_show_critical_error();
return;
}
if (!gBlkBuf) gBlkBuf = (uint8*) mlc_malloc (512);
int partBlkSizMul = blk0[2] / 2; // = size of partition blocks times 512
while (blkNo <= partBlkCount) {
MacPart *pm = (MacPart*) gBlkBuf;
// read next block
err = ata_readblock (gBlkBuf, blkNo * partBlkSizMul);
if (err) {
mlc_printf ("!Read error blk %d: %d\n", blkNo * partBlkSizMul, err);
mlc_show_critical_error();
break; // read error -> leave the loop
}
// see if it's a partition entry
if (pm->pmSig[0] != 'P' || pm->pmSig[1] != 'M') break; // end of partition table -> leave the loop
// update the number of part map blocks
partBlkCount = pm->pmMapBlkCnt;
long partBlk = pm->pmPyPartStart * partBlkSizMul;
#if DEBUG
mlc_printf ("part name: %s, type: %s\n", pm->pmPartName, pm->pmParType);
#endif
// check the partition type so we can detect the firmware and HFS+ partitions
if (0 == mlc_strncmp (pm->pmParType, "Apple_MDFW", sizeof (pm->pmParType))) {
// a firmware partition
#if DEBUG
mlc_printf ("found firmware partition\n", pm->pmPartName, pm->pmParType);
#endif
fwfs_newfs (blkNo-2, partBlk);
} else if (0 == mlc_strncmp (pm->pmParType, "Apple_HFS", sizeof (pm->pmParType))) {
// a HFS(+) partition
#if DEBUG
mlc_printf ("found HFS partition\n", pm->pmPartName, pm->pmParType);
#endif
hfsplus_newfs (blkNo-2, partBlk);
} else {
// something else - let's ignore it for now
}
blkNo++; // read next partition map entry
}
#if DEBUG
mlc_printf ("End of partition map\n");
#endif
}
//----------------------------------------------------------------------------------
// HFS+ Code
//----------------------------------------------------------------------------------
#include "hfsplusstructs.h"
// what follows is code for comparing unicode strings with the rules Apple has defined
// for use with names in the catalog (i.e. order of characters, upper/lower case conversion)
#include "unicodecmp.h"
static int compareUnicode (const hfsunistr s1, const hfsunistr s2)
{
return FastUnicodeCompare (&s1.unicode[0], s1.length, &s2.unicode[0], s2.length);
}
#define MAX_HANDLES 10
#define ExtentCnt 8 // do not change this - it is fixed by HFS+
typedef ext_long ext_set[ExtentCnt];
static int fileHasOverflownExtents (forkdata* theFork, int showError = 0, const char* name = 0)
{
// check whether the 8 extents in the dir entry cover the entire file
// (if not, we have a problem because this code does not use the
// extents overflow file yet)
uint32 clusterCnt = 0;
for (int i = 0; i < ExtentCnt; ++i) {
clusterCnt += theFork->extents[i].blockCount;
}
if (clusterCnt != theFork->totalBlocks) {
// we have a problem
if (showError) {
mlc_printf ("!Error: too many extents in: %s\n", name ? name : "?");
}
return 1;
}
// all is fine
return 0;
}
typedef struct {
ext_set fileExtents;
int32 length;
uint32 position;
char opened;
} hfsplus_file;
typedef struct {
// constant values from the MDB:
uint32 catNodeSize;
ext_set catExtents;
uint32 partBlkStart;
uint32 partClusterSize;
uint32 blksInACluster;
uint32 catRootNodeID;
// dynamic values for the file management:
hfsplus_file *filehandles[MAX_HANDLES];
uint32 numHandles;
} hfsplus_t;
static void* nodeBuf = 0;
static uint32 nodeBufSize = 0;
static uint32 nodeBufID = (uint32)-1;
static char nodeBufInUse = 0;
static ext_set* gCurrExtents = 0;
static hfsplus_t* gCurrVolume = 0;
static uint32 nodeToBlockNo (uint32 id)
{
uint32 nodeCluster = id * gCurrVolume->catNodeSize;
// first, find the extent containing the given node number
for (int i = 0; i < ExtentCnt; ++i) {
if ((id* gCurrVolume->catNodeSize) < ((*gCurrExtents)[i].blockCount * gCurrVolume->partClusterSize)) {
// found the extent
uint32 blockNo = ((*gCurrExtents)[i].startBlock * gCurrVolume->partClusterSize + id * gCurrVolume->catNodeSize) / 512 + gCurrVolume->partBlkStart;
return blockNo;
}
nodeCluster -= ((*gCurrExtents)[i].blockCount * gCurrVolume->partClusterSize);
}
mlc_printf ("!Error: extents overflow\n");
mlc_show_critical_error();
return 0;
}
static hfs_node* getNode (uint32 id)
// id is the catalog file's cluster number of the node
{
if (nodeBufInUse) {
mlc_printf ("!Internal err: getNode - node in use\n");
mlc_show_critical_error();
return 0;
}
if (nodeBufSize < gCurrVolume->catNodeSize) {
// we need a larger node buffer
nodeBufSize = gCurrVolume->catNodeSize;
nodeBuf = mlc_malloc (nodeBufSize);
nodeBufID = (uint32)-1;
}
if (!nodeBuf) {
mlc_printf ("!Internal err: getNode - out of mem\n");
mlc_show_critical_error();
return 0;
}
nodeBufInUse = 1;
if (nodeBufID == id) {
// we have this blk still in the buffer, no need to read it again
} else {
uint32 blkNo = nodeToBlockNo (id);
ata_readblocks (nodeBuf, blkNo, gCurrVolume->catNodeSize / 512);
nodeBufID = id;
}
return (hfs_node*) nodeBuf;
}
static void releaseNode (hfs_node* node)
{
nodeBufInUse = 0;
}
typedef void* recptr;
static uint16 hfsRecofs (hfs_node *node, short i)
{
return ((uint16be*)node)[(gCurrVolume->catNodeSize/2-1) - i];
}
static int16be* getRecord(hfs_node *node, short i)
{
return (int16be*)(((char*)node) + hfsRecofs(node, i));
}
static int compareKey (const recptr key1, const recptr key2)
{
int result = ((cat_key*)key1)->parentID - ((cat_key*)key2)->parentID;
if (result == 0) {
result = compareUnicode (((cat_key*)key1)->nodeName, ((cat_key*)key2)->nodeName);
}
return result;
}
static uint16 keyLen (const recptr key)
{
return 2 + *(uint16be*)key;
}
static recptr skipKey (const recptr key)
{
return (recptr)((char*)key + keyLen(key));
}
static recptr searchLeafNode(hfs_node *node, const recptr key)
{
short n = node->numRecords;
for (short i = 0; i < n; i++) {
recptr rec = getRecord (node, i);
int result = compareKey (key, rec);
if (result == 0) {
return skipKey(rec);
}
if (result < 0) {
break;
}
}
return NULL;
}
static int32 searchIndexNode(hfs_node *node, const recptr key)
{
int32 nextNode = 0;
for (short i = 0; i < node->numRecords; i++) {
recptr rec = getRecord (node, i);
int32 nodeID = (int32) *((int32be *) skipKey(rec));
int result = compareKey (key, rec);
if (result < 0) {
if (nextNode == 0) nextNode = nodeID;
break;
}
nextNode = nodeID;
}
return nextNode;
}
static recptr searchNode(uint32 nodeID, const recptr key)
{
hfs_node *node = getNode (nodeID);
recptr result = NULL;
if (nodeID) {
if (node->type == kIndexNode) {
nodeID = searchIndexNode (node, key);
releaseNode (node); node = (hfs_node*)NULL; // this makes sure we do not keep more than one node open at all times
result = searchNode(nodeID, key);
} else {
result = searchLeafNode (node, key);
}
}
if (node) releaseNode (node); // attn: we release it here, yet we will still access the buffer!
return result;
}
static recptr findkey (const recptr key)
{
return searchNode (gCurrVolume->catRootNodeID, key);
}
static void hfsglobals_enter (hfsplus_t* fsData, ext_set* extents)
{
if (gCurrExtents) {
mlc_printf ("!Internal err: gCurrExtents in use\n");
mlc_show_critical_error();
}
gCurrExtents = extents;
gCurrVolume = fsData;
}
static void hfsglobals_leave ()
{
gCurrExtents = 0;
gCurrVolume = 0;
}
static cat_data_rec* findCatalogData (hfsplus_t* fsData, long parID, const hfsunistr *name)
{
hfsglobals_enter (fsData, &fsData->catExtents);
cat_key key;
key.parentID = parID;
key.nodeName = *name; // for some reason, using mlc_memcpy here instead leads to a crash
key.keyLength = 4 + 2 + 2 * key.nodeName.length;
cat_data_rec *rec = (cat_data_rec*) findkey ((uint8*)&key);
hfsglobals_leave ();
return rec;
}
static void getExtent (hfsplus_t* fsData, ext_set &extents, uint32 position, uint32 *blockOut, uint32 *ofsInBlkOut, uint32 *remBytesInExtOut)
{
uint32 clusterNo = position / fsData->partClusterSize;
position -= clusterNo * fsData->partClusterSize;
int i;
uint32 clustersInExt;
for (i = 0; i < ExtentCnt; ++i) {
clustersInExt = extents[i].blockCount;
if (clusterNo < clustersInExt) break; // found the extent
clusterNo -= clustersInExt;
}
*remBytesInExtOut = (clustersInExt - clusterNo) * fsData->partClusterSize - position;
// now we have the cluster's start, but we want to get to the block's (512 byte size) start
uint32 remBlks = position / 512;
position -= remBlks * 512;
*blockOut = (extents[i].startBlock + clusterNo) * fsData->blksInACluster + fsData->partBlkStart + remBlks;
*ofsInBlkOut = position;
}
// -----------------------------
// vfs handlers
// -----------------------------
static hfsplus_file *hfsplus_findfile (hfsplus_t *fsdata, char *fname)
{
cat_data_rec* cdat = 0;
long parID = 2; // root dir
char *origName = fname;
char name[256];
if (fname && *fname == '/') ++fname;
while (fname && *fname) {
if (cdat) {
if (cdat->d.recordType != kHFSPlusFolderRecord) {
// last segment was not a folder
mlc_printf ("!Oops: not a folder: %s\n", name);
mlc_show_critical_error ();
return 0;
}
parID = cdat->d.folderID;
}
// extract the next path segment
char *nextPath;
int len;
nextPath = mlc_strchr (fname,'/');
if (nextPath) {
len = nextPath - fname;
nextPath++;
} else {
len = mlc_strlen (fname);
}
mlc_memcpy (name, fname, len);
name[len] = 0;
// locate the dir entry
hfsunistr uname;
uname = name;
cdat = findCatalogData (fsdata, parID, &uname);
if (!cdat) {
// not found
return 0;
}
fname = nextPath;
}
if (cdat->f.recordType != kHFSPlusFileRecord) {
// found, but it's not a file
mlc_printf ("!Oops: not a file: %s\n", origName);
mlc_show_critical_error ();
return 0;
}
if (fileHasOverflownExtents (&cdat->f.dataFork, 1, origName)) {
mlc_show_critical_error();
return 0;
}
hfsplus_file *fileptr = 0;
fileptr = (hfsplus_file*)mlc_malloc (sizeof(hfsplus_file));
fileptr->length = cdat->f.dataFork.logicalSizeLo;
fileptr->position = 0;
// we need to copy the extents, but this code leads to a crash:
// mlc_memcpy (&fileptr->fileExtents, cdat->f.dataFork.extents, sizeof (fileptr->fileExtents));
// so we copy it by hand instead:
for (int i = 0; i < ExtentCnt; ++i) { fileptr->fileExtents[i] = cdat->f.dataFork.extents[i]; }
return fileptr;
}
static int hfsplus_open (void *fsdata, char *fname)
{
hfsplus_file *file = 0;
hfsplus_t *fs;
fs = (hfsplus_t*)fsdata;
#if DEBUG
mlc_printf ("### hfs+: looking for %s ###\n", fname);
#endif
file = hfsplus_findfile (fs, fname);
if (!file) {
#if DEBUG
mlc_printf (" NOT found\n");
#endif
return -1;
}
#if DEBUG
mlc_printf (" found OK\n");
#endif
if (file != NULL) {
if (fs->numHandles < MAX_HANDLES) {
fs->filehandles[fs->numHandles] = file;
return fs->numHandles++;
} else {
mlc_printf ("!Internal err: out of file hdls\n");
mlc_show_critical_error();
}
}
return -1;
}
static void hfsplus_close (void *fsdata, int fd)
{
hfsplus_t *fs = (hfsplus_t*)fsdata;
if (fd == (int)fs->numHandles-1) {
--fs->numHandles;
}
}
static void copyBytesFromTo (const char* from, char* to, long n)
{
while (n-- > 0) { *to++ = *from++; }
}
static size_t hfsplus_read (void *fsdata, void *ptr, size_t size, size_t nmemb, int fd)
{
hfsplus_t *fs = (hfsplus_t*)fsdata;
hfsplus_file *fh = fs->filehandles[fd];
uint32 totalRead, toRead;
totalRead = 0;
toRead = size*nmemb;
uint32 filePos = fh->position;
if (toRead > (fh->length + filePos)) {
toRead = fh->length + filePos;
}
while (toRead > 0) {
uint32 blockNum, ofsInBlk, remBytesInExtent;
getExtent (fs, fh->fileExtents, filePos, &blockNum, &ofsInBlk, &remBytesInExtent);
while (toRead > 0 && remBytesInExtent > 0) {
uint32 bytesInBlk = 512 - ofsInBlk;
if (bytesInBlk > toRead) bytesInBlk = toRead;
if (bytesInBlk != 512 || ((uint32)ptr & 3) != 0) {
// copy using an interim buffer
if (bytesInBlk == 512) {
#if DEBUG
mlc_printf ("## hfs warning: slow read\n");
#endif
ata_readblocks (gBlkBuf, blockNum, 1); // uncached read for whole blocks
} else {
ata_readblocks (gBlkBuf, blockNum, 1); // cached read for partial blocks
}
copyBytesFromTo ((char*)gBlkBuf + ofsInBlk, (char*)ptr, bytesInBlk);
} else {
// load the data directly to the destination
ata_readblocks (ptr, blockNum, 1);
}
ofsInBlk = 0;
ptr = (char*)ptr + bytesInBlk;
remBytesInExtent -= bytesInBlk;
toRead -= bytesInBlk;
filePos += bytesInBlk;
++blockNum;
totalRead += bytesInBlk;
}
}
fh->position += totalRead;
return totalRead / size;
}
static long hfsplus_tell (void *fsdata,int fd)
{
hfsplus_t *fs = (hfsplus_t*)fsdata;
return fs->filehandles[fd]->position;
}
static int hfsplus_seek (void *fsdata,int fd,long offset,int whence)
{
hfsplus_t *fs = (hfsplus_t*)fsdata;
switch(whence) {
case VFS_SEEK_CUR:
offset += fs->filehandles[fd]->position;
break;
case VFS_SEEK_SET:
break;
case VFS_SEEK_END:
offset += fs->filehandles[fd]->length;
break;
default:
mlc_printf ("!Internal err: wrong seek whence: %d\n", whence);
mlc_show_critical_error();
return -2;
}
if( offset < 0 || offset > fs->filehandles[fd]->length ) {
return -1;
}
fs->filehandles[fd]->position = offset;
return 0;
}
// -----------------------------
// vfs installation
// -----------------------------
static filesystem myfs;
#define assert_size(s,t) if (s != sizeof (t)) { mlc_printf ("!Internal err: wrong struct size\n"); mlc_show_critical_error(); }
static void hfsplus_newfs (uint8 part, uint32 offset) {
hfsplus_mdb* mdb = (hfsplus_mdb*) gBlkBuf;
assert_size (106, btree_hdr);
/* Verify that this is a hfs+ partition */
ata_readblock (gBlkBuf, offset+2);
if ((gBlkBuf[0] != 'H') || (gBlkBuf[1] != '+')) {
mlc_printf ("!Error: not a valid HFS+ partition\n");
mlc_show_critical_error ();
return;
}
if (fileHasOverflownExtents (&mdb->catalogFile, 1, "HFS Catalog File")) {
mlc_show_critical_error();
return;
}
/* allocate the storage for the fs data (so that we can handle more than one HFS partition) */
hfsplus_t* fsData = (hfsplus_t*) mlc_malloc (sizeof (hfsplus_t));
if (!fsData) {
mlc_printf ("!Error: hfsplus_newfs - out of mem\n");
mlc_show_critical_error();
return;
}
myfs.open = hfsplus_open;
myfs.close = hfsplus_close;
myfs.tell = hfsplus_tell;
myfs.seek = hfsplus_seek;
myfs.read = hfsplus_read;
myfs.getinfo = 0;
myfs.fsdata = (void*)fsData;
myfs.partnum = part;
myfs.type = HFSPLUS;
/* set up the fs data for this partition */
fsData->numHandles = 0;
fsData->partBlkStart = offset;
fsData->partClusterSize = mdb->blockSize;
fsData->blksInACluster = fsData->partClusterSize / 512;
for (int i = 0; i < ExtentCnt; ++i) { fsData->catExtents[i] = mdb->catalogFile.extents[i]; }
fsData->catNodeSize = 8192; // will be updated below
// get the btree root node
gCurrVolume = fsData;
gCurrExtents = &fsData->catExtents;
hfs_node *node = getNode (0);
btree_hdr *hdr = (btree_hdr*) &node->data[0];
{
fsData->catNodeSize = hdr->nodeSize;
fsData->catRootNodeID = hdr->rootNodeID;
}
releaseNode (node); // attn: we release it here, yet we will still access the buffer!
gCurrVolume = 0;
gCurrExtents = 0;
vfs_registerfs (&myfs);
/*
{ // test:
int fd = hfsplus_open (fsData, "macpartitions.cc");
if (fd >= 0) {
char buff[2024];
long n;
n = hfsplus_read (fsData, buff, 100, 1, fd);
n = hfsplus_read (fsData, buff, 2000, 1, fd);
n = hfsplus_read (fsData, buff, 100, 1, fd);
}
}
*/
}
// EOF