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physfs/archivers/lzma.c

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/*
* LZMA support routines for PhysicsFS.
*
* Please see the file LICENSE in the source's root directory.
*
* This file written by Dennis Schridde, with some peeking at "7zMain.c"
* by Igor Pavlov.
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#if (defined PHYSFS_SUPPORTS_LZMA)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "physfs.h"
#include "7zIn.h"
#include "LzmaStateDecode.h"
#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
#define LZMA_READBUFSIZE (16 * 1024)
#define LZMA_7Z_FILE_SIG 0x7a37
typedef struct
{
ISzInStream InStream;
void *File;
} CFileInStream;
typedef struct
{
CArchiveDatabaseEx db;
CFileInStream stream;
struct _LZMAentry *firstEntry;
struct _LZMAentry *lastEntry;
} LZMAarchive;
typedef struct _LZMAentry
{
LZMAarchive *archive;
struct _LZMAentry *next;
struct _LZMAentry *previous;
CFileItem *file;
CLzmaDecoderState state;
PHYSFS_uint32 index;
PHYSFS_uint32 folderIndex;
PHYSFS_uint32 bufferedBytes;
PHYSFS_uint32 compressedSize;
PHYSFS_uint32 position;
PHYSFS_uint32 compressedPosition;
PHYSFS_uint8 buffer[LZMA_READBUFSIZE];
PHYSFS_uint8 *bufferPos;
} LZMAentry;
static void *SzAllocPhysicsFS(size_t size)
{
return ((size == 0) ? NULL : allocator.Malloc(size));
} /* SzAllocPhysicsFS */
static void SzFreePhysicsFS(void *address)
{
if (address != NULL)
allocator.Free(address);
} /* SzFreePhysicsFS */
SZ_RESULT SzFileReadImp(void *object, void *buffer,
size_t size, size_t *processedSize)
{
CFileInStream *s = (CFileInStream *) object;
size_t processedSizeLoc;
processedSizeLoc = __PHYSFS_platformRead(s->File, buffer, size, 1) * size;
if (processedSize != NULL)
*processedSize = processedSizeLoc;
return SZ_OK;
} /* SzFileReadImp */
SZ_RESULT SzFileSeekImp(void *object, CFileSize pos)
{
CFileInStream *s = (CFileInStream *) object;
if (__PHYSFS_platformSeek(s->File, (PHYSFS_uint64) pos))
return SZ_OK;
return SZE_FAIL;
} /* SzFileSeekImp */
LZMAentry *lzma_find_entry(LZMAarchive *archive, const char *name)
{
/* !!! FIXME: don't malloc here */
LZMAentry *entry = (LZMAentry *) allocator.Malloc(sizeof (LZMAentry));
const PHYSFS_uint32 imax = archive->db.Database.NumFiles;
for (entry->index = 0; entry->index < imax; entry->index++)
{
entry->file = archive->db.Database.Files + entry->index;
if (strcmp(entry->file->Name, name) == 0)
return entry;
} /* for */
allocator.Free(entry);
BAIL_MACRO(ERR_NO_SUCH_FILE, NULL);
} /* lzma_find_entry */
static PHYSFS_sint32 lzma_find_start_of_dir(LZMAarchive *archive,
const char *path,
int stop_on_first_find)
{
PHYSFS_sint32 lo = 0;
PHYSFS_sint32 hi = (PHYSFS_sint32) (archive->db.Database.NumFiles - 1);
PHYSFS_sint32 middle;
PHYSFS_uint32 dlen = strlen(path);
PHYSFS_sint32 retval = -1;
const char *name;
int rc;
if (*path == '\0') /* root dir? */
return(0);
if ((dlen > 0) && (path[dlen - 1] == '/')) /* ignore trailing slash. */
dlen--;
while (lo <= hi)
{
middle = lo + ((hi - lo) / 2);
name = archive->db.Database.Files[middle].Name;
rc = strncmp(path, name, dlen);
if (rc == 0)
{
char ch = name[dlen];
if ('/' < ch) /* make sure this isn't just a substr match. */
rc = -1;
else if ('/' > ch)
rc = 1;
else
{
if (stop_on_first_find) /* Just checking dir's existance? */
return(middle);
if (name[dlen + 1] == '\0') /* Skip initial dir entry. */
return(middle + 1);
/* there might be more entries earlier in the list. */
retval = middle;
hi = middle - 1;
} /* else */
} /* if */
if (rc > 0)
lo = middle + 1;
else
hi = middle - 1;
} /* while */
return(retval);
} /* lzma_find_start_of_dir */
/*
* Wrap all 7z calls in this, so the physfs error state is set appropriately.
*/
static int lzma_err(SZ_RESULT rc)
{
switch (rc)
{
case SZ_OK: /* Same as LZMA_RESULT_OK */
break;
case SZE_DATA_ERROR: /* Same as LZMA_RESULT_DATA_ERROR */
__PHYSFS_setError(ERR_DATA_ERROR);
break;
case SZE_OUTOFMEMORY:
__PHYSFS_setError(ERR_OUT_OF_MEMORY);
break;
case SZE_CRC_ERROR:
__PHYSFS_setError(ERR_CORRUPTED);
break;
case SZE_NOTIMPL:
__PHYSFS_setError(ERR_NOT_IMPLEMENTED);
break;
case SZE_FAIL:
__PHYSFS_setError(ERR_UNKNOWN_ERROR); /* !!! FIXME: right? */
break;
case SZE_ARCHIVE_ERROR:
__PHYSFS_setError(ERR_CORRUPTED); /* !!! FIXME: right? */
break;
default:
__PHYSFS_setError(ERR_UNKNOWN_ERROR);
} /* switch */
return(rc);
} /* lzma_err */
static PHYSFS_sint64 LZMA_read(fvoid *opaque, void *outBuffer,
PHYSFS_uint32 objSize, PHYSFS_uint32 objCount)
{
LZMAentry *entry = (LZMAentry *) opaque;
size_t wantBytes = objSize * objCount;
size_t decodedBytes = 0;
size_t totalDecodedBytes = 0;
size_t bufferBytes = 0;
size_t usedBufferedBytes = 0;
size_t availableBytes = entry->file->Size - entry->position;
BAIL_IF_MACRO(wantBytes == 0, NULL, 0); /* quick rejection. */
if (availableBytes < wantBytes)
{
wantBytes = availableBytes - (availableBytes % objSize);
objCount = wantBytes / objSize;
BAIL_IF_MACRO(objCount == 0, ERR_PAST_EOF, 0); /* quick rejection. */
__PHYSFS_setError(ERR_PAST_EOF); /* this is always true here. */
} /* if */
while (totalDecodedBytes < wantBytes)
{
if (entry->bufferedBytes == 0)
{
bufferBytes = entry->compressedSize - entry->compressedPosition;
if (bufferBytes > 0)
{
if (bufferBytes > LZMA_READBUFSIZE)
bufferBytes = LZMA_READBUFSIZE;
entry->bufferedBytes =
__PHYSFS_platformRead(entry->archive->stream.File,
entry->buffer, 1, bufferBytes);
if (entry->bufferedBytes <= 0)
break;
entry->compressedPosition += entry->bufferedBytes;
entry->bufferPos = entry->buffer;
} /* if */
} /* if */
/* bufferedBytes == 0 if we finished decompressing */
lzma_err(LzmaDecode(&entry->state,
entry->bufferPos, entry->bufferedBytes, &usedBufferedBytes,
outBuffer, wantBytes, &decodedBytes,
(entry->bufferedBytes == 0)));
entry->bufferedBytes -= usedBufferedBytes;
entry->bufferPos += usedBufferedBytes;
totalDecodedBytes += decodedBytes;
entry->position += decodedBytes;
} /* while */
return(decodedBytes);
} /* LZMA_read */
static PHYSFS_sint64 LZMA_write(fvoid *opaque, const void *buf,
PHYSFS_uint32 objSize, PHYSFS_uint32 objCount)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, -1);
} /* LZMA_write */
static int LZMA_eof(fvoid *opaque)
{
LZMAentry *entry = (LZMAentry *) opaque;
return (entry->compressedPosition >= entry->compressedSize);
} /* LZMA_eof */
static PHYSFS_sint64 LZMA_tell(fvoid *opaque)
{
LZMAentry *entry = (LZMAentry *) opaque;
return (entry->position);
} /* LZMA_tell */
static int LZMA_seek(fvoid *opaque, PHYSFS_uint64 offset)
{
LZMAentry *entry = (LZMAentry *) opaque;
PHYSFS_uint8 buf[512];
PHYSFS_uint32 maxread;
BAIL_IF_MACRO(offset < 0, ERR_SEEK_OUT_OF_RANGE, 0);
BAIL_IF_MACRO(offset > entry->file->Size, ERR_PAST_EOF, 0);
if (offset < entry->position)
{
__PHYSFS_platformSeek(entry->archive->stream.File,
SzArDbGetFolderStreamPos(&entry->archive->db,
entry->folderIndex, 0));
entry->position = 0;
entry->compressedPosition = 0;
LzmaDecoderInit(&entry->state);
} /* if */
while (offset != entry->position)
{
maxread = (PHYSFS_uint32) (offset - entry->position);
if (maxread > sizeof (buf))
maxread = sizeof (buf);
if (!LZMA_read(entry, buf, maxread, 1))
return(0);
} /* while */
return(1);
} /* LZMA_seek */
static PHYSFS_sint64 LZMA_fileLength(fvoid *opaque)
{
return ((LZMAentry *) opaque)->file->Size;
} /* LZMA_fileLength */
static int LZMA_fileClose(fvoid *opaque)
{
LZMAentry *entry = (LZMAentry *) opaque;
/* Fix archive */
if (entry == entry->archive->firstEntry)
entry->archive->firstEntry = entry->next;
if (entry == entry->archive->lastEntry)
entry->archive->lastEntry = entry->previous;
/* Fix neighbours */
if (entry->previous != NULL)
entry->previous->next = entry->next;
if (entry->next != NULL)
entry->next->previous = entry->previous;
/* Free */
if (entry->state.Probs != NULL)
allocator.Free(entry->state.Probs);
if (entry->state.Dictionary != NULL)
allocator.Free(entry->state.Dictionary);
allocator.Free(entry);
return(1);
} /* LZMA_fileClose */
static int LZMA_isArchive(const char *filename, int forWriting)
{
PHYSFS_uint8 sig[k7zSignatureSize];
PHYSFS_uint8 res;
void *in;
BAIL_IF_MACRO(forWriting, ERR_ARC_IS_READ_ONLY, 0);
in = __PHYSFS_platformOpenRead(filename);
BAIL_IF_MACRO(in == NULL, NULL, 0);
if (__PHYSFS_platformRead(in, sig, k7zSignatureSize, 1) != 1)
BAIL_MACRO(NULL, 0);
res = TestSignatureCandidate(sig);
__PHYSFS_platformClose(in);
return res;
} /* LZMA_isArchive */
static void *LZMA_openArchive(const char *name, int forWriting)
{
LZMAarchive *archive;
ISzAlloc allocImp;
ISzAlloc allocTempImp;
BAIL_IF_MACRO(forWriting, ERR_ARC_IS_READ_ONLY, NULL);
archive = (LZMAarchive *) allocator.Malloc(sizeof(LZMAarchive));
if ((archive->stream.File = __PHYSFS_platformOpenRead(name)) == NULL)
{
allocator.Free(archive);
return NULL;
} /* if */
archive->stream.InStream.Read = SzFileReadImp;
archive->stream.InStream.Seek = SzFileSeekImp;
archive->firstEntry = NULL;
archive->lastEntry = NULL;
allocImp.Alloc = SzAllocPhysicsFS;
allocImp.Free = SzFreePhysicsFS;
allocTempImp.Alloc = SzAllocPhysicsFS;
allocTempImp.Free = SzFreePhysicsFS;
InitCrcTable();
SzArDbExInit(&archive->db);
if (lzma_err(SzArchiveOpen(&archive->stream.InStream, &archive->db,
&allocImp, &allocTempImp)) != SZ_OK)
{
SzArDbExFree(&archive->db, allocImp.Free);
__PHYSFS_platformClose(archive->stream.File);
allocator.Free(archive);
return NULL;
} /* if */
return(archive);
} /* LZMA_openArchive */
/*
* Moved to seperate function so we can use alloca then immediately throw
* away the allocated stack space...
*/
static void doEnumCallback(PHYSFS_EnumFilesCallback cb, void *callbackdata,
const char *odir, const char *str, PHYSFS_sint32 ln)
{
char *newstr = alloca(ln + 1);
if (newstr == NULL)
return;
memcpy(newstr, str, ln);
newstr[ln] = '\0';
cb(callbackdata, odir, newstr);
} /* doEnumCallback */
static void LZMA_enumerateFiles(dvoid *opaque, const char *dname,
int omitSymLinks, PHYSFS_EnumFilesCallback cb,
const char *origdir, void *callbackdata)
{
LZMAarchive *archive = (LZMAarchive *) opaque;
PHYSFS_sint32 dlen;
PHYSFS_sint32 dlen_inc;
PHYSFS_sint32 max;
PHYSFS_sint32 i;
i = lzma_find_start_of_dir(archive, dname, 0);
if (i == -1) /* no such directory. */
return;
dlen = strlen(dname);
if ((dlen > 0) && (dname[dlen - 1] == '/')) /* ignore trailing slash. */
dlen--;
dlen_inc = ((dlen > 0) ? 1 : 0) + dlen;
max = (PHYSFS_sint32) archive->db.Database.NumFiles;
while (i < max)
{
char *add;
char *ptr;
PHYSFS_sint32 ln;
char *e = archive->db.Database.Files[i].Name;
if ((dlen) && ((strncmp(e, dname, dlen)) || (e[dlen] != '/')))
break; /* past end of this dir; we're done. */
add = e + dlen_inc;
ptr = strchr(add, '/');
ln = (PHYSFS_sint32) ((ptr) ? ptr-add : strlen(add));
doEnumCallback(cb, callbackdata, origdir, add, ln);
ln += dlen_inc; /* point past entry to children... */
/* increment counter and skip children of subdirs... */
while ((++i < max) && (ptr != NULL))
{
char *e_new = archive->db.Database.Files[i].Name;
if ((strncmp(e, e_new, ln) != 0) || (e_new[ln] != '/'))
break;
} /* while */
} /* while */
} /* LZMA_enumerateFiles */
static int LZMA_exists(dvoid *opaque, const char *name)
{
return(lzma_find_entry((LZMAarchive *) opaque, name) != NULL);
} /* LZMA_exists */
static PHYSFS_sint64 LZMA_getLastModTime(dvoid *opaque,
const char *name,
int *fileExists)
{
BAIL_MACRO(ERR_NOT_IMPLEMENTED, -1); /* !!! FIXME: Implement this! */
} /* LZMA_getLastModTime */
static int LZMA_isDirectory(dvoid *opaque, const char *name, int *fileExists)
{
LZMAentry *entry = lzma_find_entry((LZMAarchive *) opaque, name);
int isDir = entry->file->IsDirectory;
*fileExists = (entry != NULL);
allocator.Free(entry);
return(isDir);
} /* LZMA_isDirectory */
static int LZMA_isSymLink(dvoid *opaque, const char *name, int *fileExists)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, 0);
} /* LZMA_isSymLink */
static fvoid *LZMA_openRead(dvoid *opaque, const char *name, int *fileExists)
{
LZMAarchive *archive = (LZMAarchive *) opaque;
LZMAentry *entry = lzma_find_entry(archive, name);
BAIL_IF_MACRO(entry == NULL, ERR_NO_SUCH_FILE, NULL);
entry->archive = archive;
entry->compressedPosition = 0;
entry->position = 0;
entry->folderIndex =
entry->archive->db.FileIndexToFolderIndexMap[entry->index];
entry->next = NULL;
entry->previous = entry->archive->lastEntry;
if (entry->previous != NULL)
entry->previous->next = entry;
entry->archive->lastEntry = entry;
if (entry->archive->firstEntry == NULL)
entry->archive->firstEntry = entry;
entry->bufferPos = entry->buffer;
entry->bufferedBytes = 0;
entry->compressedSize = SzArDbGetFolderFullPackSize(&entry->archive->db,
entry->folderIndex);
__PHYSFS_platformSeek(entry->archive->stream.File,
SzArDbGetFolderStreamPos(&entry->archive->db,
entry->folderIndex, 0));
/* Create one CLzmaDecoderState per entry */
CFolder *folder = entry->archive->db.Database.Folders + entry->folderIndex;
CCoderInfo *coder = folder->Coders;
if ((folder->NumPackStreams != 1) || (folder->NumCoders != 1))
{
LZMA_fileClose(entry);
BAIL_MACRO(ERR_LZMA_NOTIMPL, NULL);
} /* if */
if (lzma_err(LzmaDecodeProperties(&entry->state.Properties, coder->Properties.Items, coder->Properties.Capacity)) != LZMA_RESULT_OK)
return NULL;
entry->state.Probs = (CProb *) allocator.Malloc(LzmaGetNumProbs(&entry->state.Properties) * sizeof(CProb));
if (entry->state.Probs == NULL)
{
LZMA_fileClose(entry);
BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
} /* if */
if (entry->state.Properties.DictionarySize == 0)
entry->state.Dictionary = NULL;
else
{
entry->state.Dictionary = (unsigned char *) allocator.Malloc(entry->state.Properties.DictionarySize);
if (entry->state.Dictionary == NULL)
{
LZMA_fileClose(entry);
BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
} /* if */
} /* else */
LzmaDecoderInit(&entry->state);
return(entry);
} /* LZMA_openRead */
static fvoid *LZMA_openWrite(dvoid *opaque, const char *filename)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, NULL);
} /* LZMA_openWrite */
static fvoid *LZMA_openAppend(dvoid *opaque, const char *filename)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, NULL);
} /* LZMA_openAppend */
static void LZMA_dirClose(dvoid *opaque)
{
LZMAarchive *archive = (LZMAarchive *) opaque;
LZMAentry *entry = archive->firstEntry;
while (entry != NULL)
{
entry = entry->next;
LZMA_fileClose(entry->previous);
} /* while */
SzArDbExFree(&archive->db, SzFreePhysicsFS);
__PHYSFS_platformClose(archive->stream.File);
allocator.Free(archive);
} /* LZMA_dirClose */
static int LZMA_remove(dvoid *opaque, const char *name)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, 0);
} /* LZMA_remove */
static int LZMA_mkdir(dvoid *opaque, const char *name)
{
BAIL_MACRO(ERR_NOT_SUPPORTED, 0);
} /* LZMA_mkdir */
const PHYSFS_ArchiveInfo __PHYSFS_ArchiveInfo_LZMA =
{
"7Z",
LZMA_ARCHIVE_DESCRIPTION,
"Dennis Schridde <devurandom@gmx.net>",
"http://icculus.org/physfs/",
};
const PHYSFS_Archiver __PHYSFS_Archiver_LZMA =
{
&__PHYSFS_ArchiveInfo_LZMA,
LZMA_isArchive, /* isArchive() method */
LZMA_openArchive, /* openArchive() method */
LZMA_enumerateFiles, /* enumerateFiles() method */
LZMA_exists, /* exists() method */
LZMA_isDirectory, /* isDirectory() method */
LZMA_isSymLink, /* isSymLink() method */
LZMA_getLastModTime, /* getLastModTime() method */
LZMA_openRead, /* openRead() method */
LZMA_openWrite, /* openWrite() method */
LZMA_openAppend, /* openAppend() method */
LZMA_remove, /* remove() method */
LZMA_mkdir, /* mkdir() method */
LZMA_dirClose, /* dirClose() method */
LZMA_read, /* read() method */
LZMA_write, /* write() method */
LZMA_eof, /* eof() method */
LZMA_tell, /* tell() method */
LZMA_seek, /* seek() method */
LZMA_fileLength, /* fileLength() method */
LZMA_fileClose /* fileClose() method */
};
#endif /* defined PHYSFS_SUPPORTS_LZMA */
/* end of lzma.c ... */
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