reactos/drivers/lib/bzip2/bzip2recover.c

   1
   2 /*-----------------------------------------------------------*/
   3 /*--- Block recoverer program for bzip2                   ---*/
   4 /*---                                      bzip2recover.c ---*/
   5 /*-----------------------------------------------------------*/
   6
   7 /*--
   8   This program is bzip2recover, a program to attempt data
   9   salvage from damaged files created by the accompanying
  10   bzip2-1.0 program.
  11
  12   Copyright (C) 1996-2000 Julian R Seward.  All rights reserved.
  13
  14   Redistribution and use in source and binary forms, with or without
  15   modification, are permitted provided that the following conditions
  16   are met:
  17
  18   1. Redistributions of source code must retain the above copyright
  19      notice, this list of conditions and the following disclaimer.
  20
  21   2. The origin of this software must not be misrepresented; you must
  22      not claim that you wrote the original software.  If you use this
  23      software in a product, an acknowledgment in the product
  24      documentation would be appreciated but is not required.
  25
  26   3. Altered source versions must be plainly marked as such, and must
  27      not be misrepresented as being the original software.
  28
  29   4. The name of the author may not be used to endorse or promote
  30      products derived from this software without specific prior written
  31      permission.
  32
  33   THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  34   OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  35   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  36   ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  37   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  38   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  39   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  40   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  41   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  42   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  43   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  44
  45   Julian Seward, Cambridge, UK.
  46   jseward@acm.org
  47   bzip2/libbzip2 version 1.0 of 21 March 2000
  48 --*/
  49
  50 /*--
  51   This program is a complete hack and should be rewritten
  52   properly.  It isn't very complicated.
  53 --*/
  54
  55 #include <stdio.h>
  56 #include <errno.h>
  57 #include <stdlib.h>
  58 #include <string.h>
  59
  60 typedef  unsigned int   UInt32;
  61 typedef  int            Int32;
  62 typedef  unsigned char  UChar;
  63 typedef  char           Char;
  64 typedef  unsigned char  Bool;
  65 #define True    ((Bool)1)
  66 #define False   ((Bool)0)
  67
  68
  69 Char inFileName[2000];
  70 Char outFileName[2000];
  71 Char progName[2000];
  72
  73 UInt32 bytesOut = 0;
  74 UInt32 bytesIn  = 0;
  75
  76
  77 /*---------------------------------------------------*/
  78 /*--- I/O errors                                  ---*/
  79 /*---------------------------------------------------*/
  80
  81 /*---------------------------------------------*/
  82 void readError ( void )
  83 {
  84    fprintf ( stderr,
  85              "%s: I/O error reading `%s', possible reason follows.\n",
  86             progName, inFileName );
  87    perror ( progName );
  88    fprintf ( stderr, "%s: warning: output file(s) may be incomplete.\n",
  89              progName );
  90    exit ( 1 );
  91 }
  92
  93
  94 /*---------------------------------------------*/
  95 void writeError ( void )
  96 {
  97    fprintf ( stderr,
  98              "%s: I/O error reading `%s', possible reason follows.\n",
  99             progName, inFileName );
 100    perror ( progName );
 101    fprintf ( stderr, "%s: warning: output file(s) may be incomplete.\n",
 102              progName );
 103    exit ( 1 );
 104 }
 105
 106
 107 /*---------------------------------------------*/
 108 void mallocFail ( Int32 n )
 109 {
 110    fprintf ( stderr,
 111              "%s: malloc failed on request for %d bytes.\n",
 112             progName, n );
 113    fprintf ( stderr, "%s: warning: output file(s) may be incomplete.\n",
 114              progName );
 115    exit ( 1 );
 116 }
 117
 118
 119 /*---------------------------------------------------*/
 120 /*--- Bit stream I/O                              ---*/
 121 /*---------------------------------------------------*/
 122
 123 typedef
 124    struct {
 125       FILE*  handle;
 126       Int32  buffer;
 127       Int32  buffLive;
 128       Char   mode;
 129    }
 130    BitStream;
 131
 132
 133 /*---------------------------------------------*/
 134 BitStream* bsOpenReadStream ( FILE* stream )
 135 {
 136    BitStream *bs = malloc ( sizeof(BitStream) );
 137    if (bs == NULL) mallocFail ( sizeof(BitStream) );
 138    bs->handle = stream;
 139    bs->buffer = 0;
 140    bs->buffLive = 0;
 141    bs->mode = 'r';
 142    return bs;
 143 }
 144
 145
 146 /*---------------------------------------------*/
 147 BitStream* bsOpenWriteStream ( FILE* stream )
 148 {
 149    BitStream *bs = malloc ( sizeof(BitStream) );
 150    if (bs == NULL) mallocFail ( sizeof(BitStream) );
 151    bs->handle = stream;
 152    bs->buffer = 0;
 153    bs->buffLive = 0;
 154    bs->mode = 'w';
 155    return bs;
 156 }
 157
 158
 159 /*---------------------------------------------*/
 160 void bsPutBit ( BitStream* bs, Int32 bit )
 161 {
 162    if (bs->buffLive == 8) {
 163       Int32 retVal = putc ( (UChar) bs->buffer, bs->handle );
 164       if (retVal == EOF) writeError();
 165       bytesOut++;
 166       bs->buffLive = 1;
 167       bs->buffer = bit & 0x1;
 168    } else {
 169       bs->buffer = ( (bs->buffer << 1) | (bit & 0x1) );
 170       bs->buffLive++;
 171    };
 172 }
 173
 174
 175 /*---------------------------------------------*/
 176 /*--
 177    Returns 0 or 1, or 2 to indicate EOF.
 178 --*/
 179 Int32 bsGetBit ( BitStream* bs )
 180 {
 181    if (bs->buffLive > 0) {
 182       bs->buffLive --;
 183       return ( ((bs->buffer) >> (bs->buffLive)) & 0x1 );
 184    } else {
 185       Int32 retVal = getc ( bs->handle );
 186       if ( retVal == EOF ) {
 187          if (errno != 0) readError();
 188          return 2;
 189       }
 190       bs->buffLive = 7;
 191       bs->buffer = retVal;
 192       return ( ((bs->buffer) >> 7) & 0x1 );
 193    }
 194 }
 195
 196
 197 /*---------------------------------------------*/
 198 void bsClose ( BitStream* bs )
 199 {
 200    Int32 retVal;
 201
 202    if ( bs->mode == 'w' ) {
 203       while ( bs->buffLive < 8 ) {
 204          bs->buffLive++;
 205          bs->buffer <<= 1;
 206       };
 207       retVal = putc ( (UChar) (bs->buffer), bs->handle );
 208       if (retVal == EOF) writeError();
 209       bytesOut++;
 210       retVal = fflush ( bs->handle );
 211       if (retVal == EOF) writeError();
 212    }
 213    retVal = fclose ( bs->handle );
 214    if (retVal == EOF) {
 215       if (bs->mode == 'w') writeError(); else readError();
 216    }
 217    free ( bs );
 218 }
 219
 220
 221 /*---------------------------------------------*/
 222 void bsPutUChar ( BitStream* bs, UChar c )
 223 {
 224    Int32 i;
 225    for (i = 7; i >= 0; i--)
 226       bsPutBit ( bs, (((UInt32) c) >> i) & 0x1 );
 227 }
 228
 229
 230 /*---------------------------------------------*/
 231 void bsPutUInt32 ( BitStream* bs, UInt32 c )
 232 {
 233    Int32 i;
 234
 235    for (i = 31; i >= 0; i--)
 236       bsPutBit ( bs, (c >> i) & 0x1 );
 237 }
 238
 239
 240 /*---------------------------------------------*/
 241 Bool endsInBz2 ( Char* name )
 242 {
 243    Int32 n = strlen ( name );
 244    if (n <= 4) return False;
 245    return
 246       (name[n-4] == '.' &&
 247        name[n-3] == 'b' &&
 248        name[n-2] == 'z' &&
 249        name[n-1] == '2');
 250 }
 251
 252
 253 /*---------------------------------------------------*/
 254 /*---                                             ---*/
 255 /*---------------------------------------------------*/
 256
 257 #define BLOCK_HEADER_HI  0x00003141UL
 258 #define BLOCK_HEADER_LO  0x59265359UL
 259
 260 #define BLOCK_ENDMARK_HI 0x00001772UL
 261 #define BLOCK_ENDMARK_LO 0x45385090UL
 262
 263
 264 UInt32 bStart[20000];
 265 UInt32 bEnd[20000];
 266 UInt32 rbStart[20000];
 267 UInt32 rbEnd[20000];
 268
 269 Int32 main ( Int32 argc, Char** argv )
 270 {
 271    FILE*       inFile;
 272    FILE*       outFile;
 273    BitStream*  bsIn, *bsWr;
 274    Int32       currBlock, b, wrBlock;
 275    UInt32      bitsRead;
 276    Int32       rbCtr;
 277
 278
 279    UInt32      buffHi, buffLo, blockCRC;
 280    Char*       p;
 281
 282    strcpy ( progName, argv[0] );
 283    inFileName[0] = outFileName[0] = 0;
 284
 285    fprintf ( stderr, "bzip2recover 1.0: extracts blocks from damaged .bz2 files.\n" );
 286
 287    if (argc != 2) {
 288       fprintf ( stderr, "%s: usage is `%s damaged_file_name'.\n",
 289                         progName, progName );
 290       exit(1);
 291    }
 292
 293    strcpy ( inFileName, argv[1] );
 294
 295    inFile = fopen ( inFileName, "rb" );
 296    if (inFile == NULL) {
 297       fprintf ( stderr, "%s: can't read `%s'\n", progName, inFileName );
 298       exit(1);
 299    }
 300
 301    bsIn = bsOpenReadStream ( inFile );
 302    fprintf ( stderr, "%s: searching for block boundaries ...\n", progName );
 303
 304    bitsRead = 0;
 305    buffHi = buffLo = 0;
 306    currBlock = 0;
 307    bStart[currBlock] = 0;
 308
 309    rbCtr = 0;
 310
 311    while (True) {
 312       b = bsGetBit ( bsIn );
 313       bitsRead++;
 314       if (b == 2) {
 315          if (bitsRead >= bStart[currBlock] &&
 316             (bitsRead - bStart[currBlock]) >= 40) {
 317             bEnd[currBlock] = bitsRead-1;
 318             if (currBlock > 0)
 319                fprintf ( stderr, "   block %d runs from %d to %d (incomplete)\n",
 320                          currBlock,  bStart[currBlock], bEnd[currBlock] );
 321          } else
 322             currBlock--;
 323          break;
 324       }
 325       buffHi = (buffHi << 1) | (buffLo >> 31);
 326       buffLo = (buffLo << 1) | (b & 1);
 327       if ( ( (buffHi & 0x0000ffff) == BLOCK_HEADER_HI
 328              && buffLo == BLOCK_HEADER_LO)
 329            ||
 330            ( (buffHi & 0x0000ffff) == BLOCK_ENDMARK_HI
 331              && buffLo == BLOCK_ENDMARK_LO)
 332          ) {
 333          if (bitsRead > 49)
 334             bEnd[currBlock] = bitsRead-49; else
 335             bEnd[currBlock] = 0;
 336          if (currBlock > 0 &&
 337              (bEnd[currBlock] - bStart[currBlock]) >= 130) {
 338             fprintf ( stderr, "   block %d runs from %d to %d\n",
 339                       rbCtr+1,  bStart[currBlock], bEnd[currBlock] );
 340             rbStart[rbCtr] = bStart[currBlock];
 341             rbEnd[rbCtr] = bEnd[currBlock];
 342             rbCtr++;
 343          }
 344          currBlock++;
 345
 346          bStart[currBlock] = bitsRead;
 347       }
 348    }
 349
 350    bsClose ( bsIn );
 351
 352    /*-- identified blocks run from 1 to rbCtr inclusive. --*/
 353
 354    if (rbCtr < 1) {
 355       fprintf ( stderr,
 356                 "%s: sorry, I couldn't find any block boundaries.\n",
 357                 progName );
 358       exit(1);
 359    };
 360
 361    fprintf ( stderr, "%s: splitting into blocks\n", progName );
 362
 363    inFile = fopen ( inFileName, "rb" );
 364    if (inFile == NULL) {
 365       fprintf ( stderr, "%s: can't open `%s'\n", progName, inFileName );
 366       exit(1);
 367    }
 368    bsIn = bsOpenReadStream ( inFile );
 369
 370    /*-- placate gcc's dataflow analyser --*/
 371    blockCRC = 0; bsWr = 0;
 372
 373    bitsRead = 0;
 374    outFile = NULL;
 375    wrBlock = 0;
 376    while (True) {
 377       b = bsGetBit(bsIn);
 378       if (b == 2) break;
 379       buffHi = (buffHi << 1) | (buffLo >> 31);
 380       buffLo = (buffLo << 1) | (b & 1);
 381       if (bitsRead == 47+rbStart[wrBlock])
 382          blockCRC = (buffHi << 16) | (buffLo >> 16);
 383
 384       if (outFile != NULL && bitsRead >= rbStart[wrBlock]
 385                           && bitsRead <= rbEnd[wrBlock]) {
 386          bsPutBit ( bsWr, b );
 387       }
 388
 389       bitsRead++;
 390
 391       if (bitsRead == rbEnd[wrBlock]+1) {
 392          if (outFile != NULL) {
 393             bsPutUChar ( bsWr, 0x17 ); bsPutUChar ( bsWr, 0x72 );
 394             bsPutUChar ( bsWr, 0x45 ); bsPutUChar ( bsWr, 0x38 );
 395             bsPutUChar ( bsWr, 0x50 ); bsPutUChar ( bsWr, 0x90 );
 396             bsPutUInt32 ( bsWr, blockCRC );
 397             bsClose ( bsWr );
 398          }
 399          if (wrBlock >= rbCtr) break;
 400          wrBlock++;
 401       } else
 402       if (bitsRead == rbStart[wrBlock]) {
 403          outFileName[0] = 0;
 404          sprintf ( outFileName, "rec%4d", wrBlock+1 );
 405          for (p = outFileName; *p != 0; p++) if (*p == ' ') *p = '0';
 406          strcat ( outFileName, inFileName );
 407          if ( !endsInBz2(outFileName)) strcat ( outFileName, ".bz2" );
 408
 409          fprintf ( stderr, "   writing block %d to `%s' ...\n",
 410                            wrBlock+1, outFileName );
 411
 412          outFile = fopen ( outFileName, "wb" );
 413          if (outFile == NULL) {
 414             fprintf ( stderr, "%s: can't write `%s'\n",
 415                       progName, outFileName );
 416             exit(1);
 417          }
 418          bsWr = bsOpenWriteStream ( outFile );
 419          bsPutUChar ( bsWr, 'B' ); bsPutUChar ( bsWr, 'Z' );
 420          bsPutUChar ( bsWr, 'h' ); bsPutUChar ( bsWr, '9' );
 421          bsPutUChar ( bsWr, 0x31 ); bsPutUChar ( bsWr, 0x41 );
 422          bsPutUChar ( bsWr, 0x59 ); bsPutUChar ( bsWr, 0x26 );
 423          bsPutUChar ( bsWr, 0x53 ); bsPutUChar ( bsWr, 0x59 );
 424       }
 425    }
 426
 427    fprintf ( stderr, "%s: finished\n", progName );
 428    return 0;
 429 }
 430
 431
 432
 433 /*-----------------------------------------------------------*/
 434 /*--- end                                  bzip2recover.c ---*/
 435 /*-----------------------------------------------------------*/