| /*-----------------------------------------------------------*/ |
| /*--- Block recoverer program for bzip2 ---*/ |
| /*--- bzip2recover.c ---*/ |
| /*-----------------------------------------------------------*/ |
| |
| /* ------------------------------------------------------------------ |
| This file is part of bzip2/libbzip2, a program and library for |
| lossless, block-sorting data compression. |
| |
| bzip2/libbzip2 version 1.0.5 of 10 December 2007 |
| Copyright (C) 1996-2007 Julian Seward <jseward@bzip.org> |
| |
| Please read the WARNING, DISCLAIMER and PATENTS sections in the |
| README file. |
| |
| This program is released under the terms of the license contained |
| in the file LICENSE. |
| ------------------------------------------------------------------ */ |
| |
| /* This program is a complete hack and should be rewritten properly. |
| It isn't very complicated. */ |
| |
| #include <stdio.h> |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| |
| /* This program records bit locations in the file to be recovered. |
| That means that if 64-bit ints are not supported, we will not |
| be able to recover .bz2 files over 512MB (2^32 bits) long. |
| On GNU supported platforms, we take advantage of the 64-bit |
| int support to circumvent this problem. Ditto MSVC. |
| |
| This change occurred in version 1.0.2; all prior versions have |
| the 512MB limitation. |
| */ |
| #ifdef __GNUC__ |
| typedef unsigned long long int MaybeUInt64; |
| # define MaybeUInt64_FMT "%Lu" |
| #else |
| #ifdef _MSC_VER |
| typedef unsigned __int64 MaybeUInt64; |
| # define MaybeUInt64_FMT "%I64u" |
| #else |
| typedef unsigned int MaybeUInt64; |
| # define MaybeUInt64_FMT "%u" |
| #endif |
| #endif |
| |
| typedef unsigned int UInt32; |
| typedef int Int32; |
| typedef unsigned char UChar; |
| typedef char Char; |
| typedef unsigned char Bool; |
| #define True ((Bool)1) |
| #define False ((Bool)0) |
| |
| |
| #define BZ_MAX_FILENAME 2000 |
| |
| Char inFileName[BZ_MAX_FILENAME]; |
| Char outFileName[BZ_MAX_FILENAME]; |
| Char progName[BZ_MAX_FILENAME]; |
| |
| MaybeUInt64 bytesOut = 0; |
| MaybeUInt64 bytesIn = 0; |
| |
| |
| /*---------------------------------------------------*/ |
| /*--- Header bytes ---*/ |
| /*---------------------------------------------------*/ |
| |
| #define BZ_HDR_B 0x42 /* 'B' */ |
| #define BZ_HDR_Z 0x5a /* 'Z' */ |
| #define BZ_HDR_h 0x68 /* 'h' */ |
| #define BZ_HDR_0 0x30 /* '0' */ |
| |
| |
| /*---------------------------------------------------*/ |
| /*--- I/O errors ---*/ |
| /*---------------------------------------------------*/ |
| |
| /*---------------------------------------------*/ |
| static void readError ( void ) |
| { |
| fprintf ( stderr, |
| "%s: I/O error reading `%s', possible reason follows.\n", |
| progName, inFileName ); |
| perror ( progName ); |
| fprintf ( stderr, "%s: warning: output file(s) may be incomplete.\n", |
| progName ); |
| exit ( 1 ); |
| } |
| |
| |
| /*---------------------------------------------*/ |
| static void writeError ( void ) |
| { |
| fprintf ( stderr, |
| "%s: I/O error reading `%s', possible reason follows.\n", |
| progName, inFileName ); |
| perror ( progName ); |
| fprintf ( stderr, "%s: warning: output file(s) may be incomplete.\n", |
| progName ); |
| exit ( 1 ); |
| } |
| |
| |
| /*---------------------------------------------*/ |
| static void mallocFail ( Int32 n ) |
| { |
| fprintf ( stderr, |
| "%s: malloc failed on request for %d bytes.\n", |
| progName, n ); |
| fprintf ( stderr, "%s: warning: output file(s) may be incomplete.\n", |
| progName ); |
| exit ( 1 ); |
| } |
| |
| |
| /*---------------------------------------------*/ |
| static void tooManyBlocks ( Int32 max_handled_blocks ) |
| { |
| fprintf ( stderr, |
| "%s: `%s' appears to contain more than %d blocks\n", |
| progName, inFileName, max_handled_blocks ); |
| fprintf ( stderr, |
| "%s: and cannot be handled. To fix, increase\n", |
| progName ); |
| fprintf ( stderr, |
| "%s: BZ_MAX_HANDLED_BLOCKS in bzip2recover.c, and recompile.\n", |
| progName ); |
| exit ( 1 ); |
| } |
| |
| |
| |
| /*---------------------------------------------------*/ |
| /*--- Bit stream I/O ---*/ |
| /*---------------------------------------------------*/ |
| |
| typedef |
| struct { |
| FILE* handle; |
| Int32 buffer; |
| Int32 buffLive; |
| Char mode; |
| } |
| BitStream; |
| |
| |
| /*---------------------------------------------*/ |
| static BitStream* bsOpenReadStream ( FILE* stream ) |
| { |
| BitStream *bs = malloc ( sizeof(BitStream) ); |
| if (bs == NULL) mallocFail ( sizeof(BitStream) ); |
| bs->handle = stream; |
| bs->buffer = 0; |
| bs->buffLive = 0; |
| bs->mode = 'r'; |
| return bs; |
| } |
| |
| |
| /*---------------------------------------------*/ |
| static BitStream* bsOpenWriteStream ( FILE* stream ) |
| { |
| BitStream *bs = malloc ( sizeof(BitStream) ); |
| if (bs == NULL) mallocFail ( sizeof(BitStream) ); |
| bs->handle = stream; |
| bs->buffer = 0; |
| bs->buffLive = 0; |
| bs->mode = 'w'; |
| return bs; |
| } |
| |
| |
| /*---------------------------------------------*/ |
| static void bsPutBit ( BitStream* bs, Int32 bit ) |
| { |
| if (bs->buffLive == 8) { |
| Int32 retVal = putc ( (UChar) bs->buffer, bs->handle ); |
| if (retVal == EOF) writeError(); |
| bytesOut++; |
| bs->buffLive = 1; |
| bs->buffer = bit & 0x1; |
| } else { |
| bs->buffer = ( (bs->buffer << 1) | (bit & 0x1) ); |
| bs->buffLive++; |
| }; |
| } |
| |
| |
| /*---------------------------------------------*/ |
| /*-- |
| Returns 0 or 1, or 2 to indicate EOF. |
| --*/ |
| static Int32 bsGetBit ( BitStream* bs ) |
| { |
| if (bs->buffLive > 0) { |
| bs->buffLive --; |
| return ( ((bs->buffer) >> (bs->buffLive)) & 0x1 ); |
| } else { |
| Int32 retVal = getc ( bs->handle ); |
| if ( retVal == EOF ) { |
| if (errno != 0) readError(); |
| return 2; |
| } |
| bs->buffLive = 7; |
| bs->buffer = retVal; |
| return ( ((bs->buffer) >> 7) & 0x1 ); |
| } |
| } |
| |
| |
| /*---------------------------------------------*/ |
| static void bsClose ( BitStream* bs ) |
| { |
| Int32 retVal; |
| |
| if ( bs->mode == 'w' ) { |
| while ( bs->buffLive < 8 ) { |
| bs->buffLive++; |
| bs->buffer <<= 1; |
| }; |
| retVal = putc ( (UChar) (bs->buffer), bs->handle ); |
| if (retVal == EOF) writeError(); |
| bytesOut++; |
| retVal = fflush ( bs->handle ); |
| if (retVal == EOF) writeError(); |
| } |
| retVal = fclose ( bs->handle ); |
| if (retVal == EOF) { |
| if (bs->mode == 'w') writeError(); else readError(); |
| } |
| free ( bs ); |
| } |
| |
| |
| /*---------------------------------------------*/ |
| static void bsPutUChar ( BitStream* bs, UChar c ) |
| { |
| Int32 i; |
| for (i = 7; i >= 0; i--) |
| bsPutBit ( bs, (((UInt32) c) >> i) & 0x1 ); |
| } |
| |
| |
| /*---------------------------------------------*/ |
| static void bsPutUInt32 ( BitStream* bs, UInt32 c ) |
| { |
| Int32 i; |
| |
| for (i = 31; i >= 0; i--) |
| bsPutBit ( bs, (c >> i) & 0x1 ); |
| } |
| |
| |
| /*---------------------------------------------*/ |
| static Bool endsInBz2 ( Char* name ) |
| { |
| Int32 n = strlen ( name ); |
| if (n <= 4) return False; |
| return |
| (name[n-4] == '.' && |
| name[n-3] == 'b' && |
| name[n-2] == 'z' && |
| name[n-1] == '2'); |
| } |
| |
| |
| /*---------------------------------------------------*/ |
| /*--- ---*/ |
| /*---------------------------------------------------*/ |
| |
| /* This logic isn't really right when it comes to Cygwin. */ |
| #ifdef _WIN32 |
| # define BZ_SPLIT_SYM '\\' /* path splitter on Windows platform */ |
| #else |
| # define BZ_SPLIT_SYM '/' /* path splitter on Unix platform */ |
| #endif |
| |
| #define BLOCK_HEADER_HI 0x00003141UL |
| #define BLOCK_HEADER_LO 0x59265359UL |
| |
| #define BLOCK_ENDMARK_HI 0x00001772UL |
| #define BLOCK_ENDMARK_LO 0x45385090UL |
| |
| /* Increase if necessary. However, a .bz2 file with > 50000 blocks |
| would have an uncompressed size of at least 40GB, so the chances |
| are low you'll need to up this. |
| */ |
| #define BZ_MAX_HANDLED_BLOCKS 50000 |
| |
| MaybeUInt64 bStart [BZ_MAX_HANDLED_BLOCKS]; |
| MaybeUInt64 bEnd [BZ_MAX_HANDLED_BLOCKS]; |
| MaybeUInt64 rbStart[BZ_MAX_HANDLED_BLOCKS]; |
| MaybeUInt64 rbEnd [BZ_MAX_HANDLED_BLOCKS]; |
| |
| Int32 main ( Int32 argc, Char** argv ) |
| { |
| FILE* inFile; |
| FILE* outFile; |
| BitStream* bsIn, *bsWr; |
| Int32 b, wrBlock, currBlock, rbCtr; |
| MaybeUInt64 bitsRead; |
| |
| UInt32 buffHi, buffLo, blockCRC; |
| Char* p; |
| |
| strcpy ( progName, argv[0] ); |
| inFileName[0] = outFileName[0] = 0; |
| |
| fprintf ( stderr, |
| "bzip2recover 1.0.5: extracts blocks from damaged .bz2 files.\n" ); |
| |
| if (argc != 2) { |
| fprintf ( stderr, "%s: usage is `%s damaged_file_name'.\n", |
| progName, progName ); |
| switch (sizeof(MaybeUInt64)) { |
| case 8: |
| fprintf(stderr, |
| "\trestrictions on size of recovered file: None\n"); |
| break; |
| case 4: |
| fprintf(stderr, |
| "\trestrictions on size of recovered file: 512 MB\n"); |
| fprintf(stderr, |
| "\tto circumvent, recompile with MaybeUInt64 as an\n" |
| "\tunsigned 64-bit int.\n"); |
| break; |
| default: |
| fprintf(stderr, |
| "\tsizeof(MaybeUInt64) is not 4 or 8 -- " |
| "configuration error.\n"); |
| break; |
| } |
| exit(1); |
| } |
| |
| if (strlen(argv[1]) >= BZ_MAX_FILENAME-20) { |
| fprintf ( stderr, |
| "%s: supplied filename is suspiciously (>= %d chars) long. Bye!\n", |
| progName, (int)strlen(argv[1]) ); |
| exit(1); |
| } |
| |
| strcpy ( inFileName, argv[1] ); |
| |
| inFile = fopen ( inFileName, "rb" ); |
| if (inFile == NULL) { |
| fprintf ( stderr, "%s: can't read `%s'\n", progName, inFileName ); |
| exit(1); |
| } |
| |
| bsIn = bsOpenReadStream ( inFile ); |
| fprintf ( stderr, "%s: searching for block boundaries ...\n", progName ); |
| |
| bitsRead = 0; |
| buffHi = buffLo = 0; |
| currBlock = 0; |
| bStart[currBlock] = 0; |
| |
| rbCtr = 0; |
| |
| while (True) { |
| b = bsGetBit ( bsIn ); |
| bitsRead++; |
| if (b == 2) { |
| if (bitsRead >= bStart[currBlock] && |
| (bitsRead - bStart[currBlock]) >= 40) { |
| bEnd[currBlock] = bitsRead-1; |
| if (currBlock > 0) |
| fprintf ( stderr, " block %d runs from " MaybeUInt64_FMT |
| " to " MaybeUInt64_FMT " (incomplete)\n", |
| currBlock, bStart[currBlock], bEnd[currBlock] ); |
| } else |
| currBlock--; |
| break; |
| } |
| buffHi = (buffHi << 1) | (buffLo >> 31); |
| buffLo = (buffLo << 1) | (b & 1); |
| if ( ( (buffHi & 0x0000ffff) == BLOCK_HEADER_HI |
| && buffLo == BLOCK_HEADER_LO) |
| || |
| ( (buffHi & 0x0000ffff) == BLOCK_ENDMARK_HI |
| && buffLo == BLOCK_ENDMARK_LO) |
| ) { |
| if (bitsRead > 49) { |
| bEnd[currBlock] = bitsRead-49; |
| } else { |
| bEnd[currBlock] = 0; |
| } |
| if (currBlock > 0 && |
| (bEnd[currBlock] - bStart[currBlock]) >= 130) { |
| fprintf ( stderr, " block %d runs from " MaybeUInt64_FMT |
| " to " MaybeUInt64_FMT "\n", |
| rbCtr+1, bStart[currBlock], bEnd[currBlock] ); |
| rbStart[rbCtr] = bStart[currBlock]; |
| rbEnd[rbCtr] = bEnd[currBlock]; |
| rbCtr++; |
| } |
| if (currBlock >= BZ_MAX_HANDLED_BLOCKS) |
| tooManyBlocks(BZ_MAX_HANDLED_BLOCKS); |
| currBlock++; |
| |
| bStart[currBlock] = bitsRead; |
| } |
| } |
| |
| bsClose ( bsIn ); |
| |
| /*-- identified blocks run from 1 to rbCtr inclusive. --*/ |
| |
| if (rbCtr < 1) { |
| fprintf ( stderr, |
| "%s: sorry, I couldn't find any block boundaries.\n", |
| progName ); |
| exit(1); |
| }; |
| |
| fprintf ( stderr, "%s: splitting into blocks\n", progName ); |
| |
| inFile = fopen ( inFileName, "rb" ); |
| if (inFile == NULL) { |
| fprintf ( stderr, "%s: can't open `%s'\n", progName, inFileName ); |
| exit(1); |
| } |
| bsIn = bsOpenReadStream ( inFile ); |
| |
| /*-- placate gcc's dataflow analyser --*/ |
| blockCRC = 0; bsWr = 0; |
| |
| bitsRead = 0; |
| outFile = NULL; |
| wrBlock = 0; |
| while (True) { |
| b = bsGetBit(bsIn); |
| if (b == 2) break; |
| buffHi = (buffHi << 1) | (buffLo >> 31); |
| buffLo = (buffLo << 1) | (b & 1); |
| if (bitsRead == 47+rbStart[wrBlock]) |
| blockCRC = (buffHi << 16) | (buffLo >> 16); |
| |
| if (outFile != NULL && bitsRead >= rbStart[wrBlock] |
| && bitsRead <= rbEnd[wrBlock]) { |
| bsPutBit ( bsWr, b ); |
| } |
| |
| bitsRead++; |
| |
| if (bitsRead == rbEnd[wrBlock]+1) { |
| if (outFile != NULL) { |
| bsPutUChar ( bsWr, 0x17 ); bsPutUChar ( bsWr, 0x72 ); |
| bsPutUChar ( bsWr, 0x45 ); bsPutUChar ( bsWr, 0x38 ); |
| bsPutUChar ( bsWr, 0x50 ); bsPutUChar ( bsWr, 0x90 ); |
| bsPutUInt32 ( bsWr, blockCRC ); |
| bsClose ( bsWr ); |
| } |
| if (wrBlock >= rbCtr) break; |
| wrBlock++; |
| } else |
| if (bitsRead == rbStart[wrBlock]) { |
| /* Create the output file name, correctly handling leading paths. |
| (31.10.2001 by Sergey E. Kusikov) */ |
| Char* split; |
| Int32 ofs, k; |
| for (k = 0; k < BZ_MAX_FILENAME; k++) |
| outFileName[k] = 0; |
| strcpy (outFileName, inFileName); |
| split = strrchr (outFileName, BZ_SPLIT_SYM); |
| if (split == NULL) { |
| split = outFileName; |
| } else { |
| ++split; |
| } |
| /* Now split points to the start of the basename. */ |
| ofs = split - outFileName; |
| sprintf (split, "rec%5d", wrBlock+1); |
| for (p = split; *p != 0; p++) if (*p == ' ') *p = '0'; |
| strcat (outFileName, inFileName + ofs); |
| |
| if ( !endsInBz2(outFileName)) strcat ( outFileName, ".bz2" ); |
| |
| fprintf ( stderr, " writing block %d to `%s' ...\n", |
| wrBlock+1, outFileName ); |
| |
| outFile = fopen ( outFileName, "wb" ); |
| if (outFile == NULL) { |
| fprintf ( stderr, "%s: can't write `%s'\n", |
| progName, outFileName ); |
| exit(1); |
| } |
| bsWr = bsOpenWriteStream ( outFile ); |
| bsPutUChar ( bsWr, BZ_HDR_B ); |
| bsPutUChar ( bsWr, BZ_HDR_Z ); |
| bsPutUChar ( bsWr, BZ_HDR_h ); |
| bsPutUChar ( bsWr, BZ_HDR_0 + 9 ); |
| bsPutUChar ( bsWr, 0x31 ); bsPutUChar ( bsWr, 0x41 ); |
| bsPutUChar ( bsWr, 0x59 ); bsPutUChar ( bsWr, 0x26 ); |
| bsPutUChar ( bsWr, 0x53 ); bsPutUChar ( bsWr, 0x59 ); |
| } |
| } |
| |
| fprintf ( stderr, "%s: finished\n", progName ); |
| return 0; |
| } |
| |
| |
| |
| /*-----------------------------------------------------------*/ |
| /*--- end bzip2recover.c ---*/ |
| /*-----------------------------------------------------------*/ |
