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  1.  
  2. /*-------------------------------------------------------------*/
  3. /*--- Library top-level functions.                          ---*/
  4. /*---                                               bzlib.c ---*/
  5. /*-------------------------------------------------------------*/
  6.  
  7. /* ------------------------------------------------------------------
  8.    This file is part of bzip2/libbzip2, a program and library for
  9.    lossless, block-sorting data compression.
  10.  
  11.    bzip2/libbzip2 version 1.0.4 of 20 December 2006
  12.    Copyright (C) 1996-2006 Julian Seward <jseward@bzip.org>
  13.  
  14.    Please read the WARNING, DISCLAIMER and PATENTS sections in the
  15.    README file.
  16.  
  17.    This program is released under the terms of the license contained
  18.    in the file LICENSE.
  19.    ------------------------------------------------------------------ */
  20.  
  21. /* CHANGES
  22.    0.9.0    -- original version.
  23.    0.9.0a/b -- no changes in this file.
  24.    0.9.0c   -- made zero-length BZ_FLUSH work correctly in bzCompress().
  25.      fixed bzWrite/bzRead to ignore zero-length requests.
  26.      fixed bzread to correctly handle read requests after EOF.
  27.      wrong parameter order in call to bzDecompressInit in
  28.      bzBuffToBuffDecompress.  Fixed.
  29. */
  30.  
  31. #include "bzlib_private.h"
  32.  
  33.  
  34. /*---------------------------------------------------*/
  35. /*--- Compression stuff                           ---*/
  36. /*---------------------------------------------------*/
  37.  
  38.  
  39. /*---------------------------------------------------*/
  40. #ifndef BZ_NO_STDIO
  41. void BZ2_bz__AssertH__fail ( int errcode )
  42. {
  43.    fprintf(stderr,
  44.       "\n\nbzip2/libbzip2: internal error number %d.\n"
  45.       "This is a bug in bzip2/libbzip2, %s.\n"
  46.       "Please report it to me at: jseward@bzip.org.  If this happened\n"
  47.       "when you were using some program which uses libbzip2 as a\n"
  48.       "component, you should also report this bug to the author(s)\n"
  49.       "of that program.  Please make an effort to report this bug;\n"
  50.       "timely and accurate bug reports eventually lead to higher\n"
  51.       "quality software.  Thanks.  Julian Seward, 15 February 2005.\n\n",
  52.       errcode,
  53.       BZ2_bzlibVersion()
  54.    );
  55.  
  56.    if (errcode == 1007) {
  57.    fprintf(stderr,
  58.       "\n*** A special note about internal error number 1007 ***\n"
  59.       "\n"
  60.       "Experience suggests that a common cause of i.e. 1007\n"
  61.       "is unreliable memory or other hardware.  The 1007 assertion\n"
  62.       "just happens to cross-check the results of huge numbers of\n"
  63.       "memory reads/writes, and so acts (unintendedly) as a stress\n"
  64.       "test of your memory system.\n"
  65.       "\n"
  66.       "I suggest the following: try compressing the file again,\n"
  67.       "possibly monitoring progress in detail with the -vv flag.\n"
  68.       "\n"
  69.       "* If the error cannot be reproduced, and/or happens at different\n"
  70.       "  points in compression, you may have a flaky memory system.\n"
  71.       "  Try a memory-test program.  I have used Memtest86\n"
  72.       "  (www.memtest86.com).  At the time of writing it is free (GPLd).\n"
  73.       "  Memtest86 tests memory much more thorougly than your BIOSs\n"
  74.       "  power-on test, and may find failures that the BIOS doesn't.\n"
  75.       "\n"
  76.       "* If the error can be repeatably reproduced, this is a bug in\n"
  77.       "  bzip2, and I would very much like to hear about it.  Please\n"
  78.       "  let me know, and, ideally, save a copy of the file causing the\n"
  79.       "  problem -- without which I will be unable to investigate it.\n"
  80.       "\n"
  81.    );
  82.    }
  83.  
  84.    exit(3);
  85. }
  86. #endif
  87.  
  88.  
  89. /*---------------------------------------------------*/
  90. static
  91. int bz_config_ok ( void )
  92. {
  93.    if (sizeof(int)   != 4) return 0;
  94.    if (sizeof(short) != 2) return 0;
  95.    if (sizeof(char)  != 1) return 0;
  96.    return 1;
  97. }
  98.  
  99.  
  100. /*---------------------------------------------------*/
  101. static
  102. void* default_bzalloc ( void* opaque, Int32 items, Int32 size )
  103. {
  104.    void* v = malloc ( items * size );
  105.    return v;
  106. }
  107.  
  108. static
  109. void default_bzfree ( void* opaque, void* addr )
  110. {
  111.    if (addr != NULL) free ( addr );
  112. }
  113.  
  114.  
  115. /*---------------------------------------------------*/
  116. static
  117. void prepare_new_block ( EState* s )
  118. {
  119.    Int32 i;
  120.    s->nblock = 0;
  121.    s->numZ = 0;
  122.    s->state_out_pos = 0;
  123.    BZ_INITIALISE_CRC ( s->blockCRC );
  124.    for (i = 0; i < 256; i++) s->inUse[i] = False;
  125.    s->blockNo++;
  126. }
  127.  
  128.  
  129. /*---------------------------------------------------*/
  130. static
  131. void init_RL ( EState* s )
  132. {
  133.    s->state_in_ch  = 256;
  134.    s->state_in_len = 0;
  135. }
  136.  
  137.  
  138. static
  139. Bool isempty_RL ( EState* s )
  140. {
  141.    if (s->state_in_ch < 256 && s->state_in_len > 0)
  142.       return False; else
  143.       return True;
  144. }
  145.  
  146.  
  147. /*---------------------------------------------------*/
  148. int BZ_API(BZ2_bzCompressInit)
  149.                     ( bz_stream* strm,
  150.                      int        blockSize100k,
  151.                      int        verbosity,
  152.                      int        workFactor )
  153. {
  154.    Int32   n;
  155.    EState* s;
  156.  
  157.    if (!bz_config_ok()) return BZ_CONFIG_ERROR;
  158.  
  159.    if (strm == NULL ||
  160.        blockSize100k < 1 || blockSize100k > 9 ||
  161.        workFactor < 0 || workFactor > 250)
  162.      return BZ_PARAM_ERROR;
  163.  
  164.    if (workFactor == 0) workFactor = 30;
  165.    if (strm->bzalloc == NULL) strm->bzalloc = default_bzalloc;
  166.    if (strm->bzfree == NULL) strm->bzfree = default_bzfree;
  167.  
  168.    s = BZALLOC( sizeof(EState) );
  169.    if (s == NULL) return BZ_MEM_ERROR;
  170.    s->strm = strm;
  171.  
  172.    s->arr1 = NULL;
  173.    s->arr2 = NULL;
  174.    s->ftab = NULL;
  175.  
  176.    n       = 100000 * blockSize100k;
  177.    s->arr1 = BZALLOC( n                  * sizeof(UInt32) );
  178.    s->arr2 = BZALLOC( (n+BZ_N_OVERSHOOT) * sizeof(UInt32) );
  179.    s->ftab = BZALLOC( 65537              * sizeof(UInt32) );
  180.  
  181.    if (s->arr1 == NULL || s->arr2 == NULL || s->ftab == NULL) {
  182.       if (s->arr1 != NULL) BZFREE(s->arr1);
  183.       if (s->arr2 != NULL) BZFREE(s->arr2);
  184.       if (s->ftab != NULL) BZFREE(s->ftab);
  185.       if (s       != NULL) BZFREE(s);
  186.       return BZ_MEM_ERROR;
  187.    }
  188.  
  189.    s->blockNo           = 0;
  190.    s->state             = BZ_S_INPUT;
  191.    s->mode              = BZ_M_RUNNING;
  192.    s->combinedCRC       = 0;
  193.    s->blockSize100k     = blockSize100k;
  194.    s->nblockMAX         = 100000 * blockSize100k - 19;
  195.    s->verbosity         = verbosity;
  196.    s->workFactor        = workFactor;
  197.  
  198.    s->block             = (UChar*)s->arr2;
  199.    s->mtfv              = (UInt16*)s->arr1;
  200.    s->zbits             = NULL;
  201.    s->ptr               = (UInt32*)s->arr1;
  202.  
  203.    strm->state          = s;
  204.    strm->total_in_lo32  = 0;
  205.    strm->total_in_hi32  = 0;
  206.    strm->total_out_lo32 = 0;
  207.    strm->total_out_hi32 = 0;
  208.    init_RL ( s );
  209.    prepare_new_block ( s );
  210.    return BZ_OK;
  211. }
  212.  
  213.  
  214. /*---------------------------------------------------*/
  215. static
  216. void add_pair_to_block ( EState* s )
  217. {
  218.    Int32 i;
  219.    UChar ch = (UChar)(s->state_in_ch);
  220.    for (i = 0; i < s->state_in_len; i++) {
  221.       BZ_UPDATE_CRC( s->blockCRC, ch );
  222.    }
  223.    s->inUse[s->state_in_ch] = True;
  224.    switch (s->state_in_len) {
  225.       case 1:
  226.          s->block[s->nblock] = (UChar)ch; s->nblock++;
  227.          break;
  228.       case 2:
  229.          s->block[s->nblock] = (UChar)ch; s->nblock++;
  230.          s->block[s->nblock] = (UChar)ch; s->nblock++;
  231.          break;
  232.       case 3:
  233.          s->block[s->nblock] = (UChar)ch; s->nblock++;
  234.          s->block[s->nblock] = (UChar)ch; s->nblock++;
  235.          s->block[s->nblock] = (UChar)ch; s->nblock++;
  236.          break;
  237.       default:
  238.          s->inUse[s->state_in_len-4] = True;
  239.          s->block[s->nblock] = (UChar)ch; s->nblock++;
  240.          s->block[s->nblock] = (UChar)ch; s->nblock++;
  241.          s->block[s->nblock] = (UChar)ch; s->nblock++;
  242.          s->block[s->nblock] = (UChar)ch; s->nblock++;
  243.          s->block[s->nblock] = ((UChar)(s->state_in_len-4));
  244.          s->nblock++;
  245.          break;
  246.    }
  247. }
  248.  
  249.  
  250. /*---------------------------------------------------*/
  251. static
  252. void flush_RL ( EState* s )
  253. {
  254.    if (s->state_in_ch < 256) add_pair_to_block ( s );
  255.    init_RL ( s );
  256. }
  257.  
  258.  
  259. /*---------------------------------------------------*/
  260. #define ADD_CHAR_TO_BLOCK(zs,zchh0)               \
  261. {                                                 \
  262.    UInt32 zchh = (UInt32)(zchh0);                 \
  263.    /*-- fast track the common case --*/           \
  264.    if (zchh != zs->state_in_ch &&                 \
  265.        zs->state_in_len == 1) {                   \
  266.       UChar ch = (UChar)(zs->state_in_ch);        \
  267.       BZ_UPDATE_CRC( zs->blockCRC, ch );          \
  268.       zs->inUse[zs->state_in_ch] = True;          \
  269.       zs->block[zs->nblock] = (UChar)ch;          \
  270.       zs->nblock++;                               \
  271.       zs->state_in_ch = zchh;                     \
  272.    }                                              \
  273.    else                                           \
  274.    /*-- general, uncommon cases --*/              \
  275.    if (zchh != zs->state_in_ch ||                 \
  276.       zs->state_in_len == 255) {                  \
  277.       if (zs->state_in_ch < 256)                  \
  278.          add_pair_to_block ( zs );                \
  279.       zs->state_in_ch = zchh;                     \
  280.       zs->state_in_len = 1;                       \
  281.    } else {                                       \
  282.       zs->state_in_len++;                         \
  283.    }                                              \
  284. }
  285.  
  286.  
  287. /*---------------------------------------------------*/
  288. static
  289. Bool copy_input_until_stop ( EState* s )
  290. {
  291.    Bool progress_in = False;
  292.  
  293.    if (s->mode == BZ_M_RUNNING) {
  294.  
  295.       /*-- fast track the common case --*/
  296.       while (True) {
  297.          /*-- block full? --*/
  298.          if (s->nblock >= s->nblockMAX) break;
  299.          /*-- no input? --*/
  300.          if (s->strm->avail_in == 0) break;
  301.          progress_in = True;
  302.          ADD_CHAR_TO_BLOCK ( s, (UInt32)(*((UChar*)(s->strm->next_in))) );
  303.          s->strm->next_in++;
  304.          s->strm->avail_in--;
  305.          s->strm->total_in_lo32++;
  306.          if (s->strm->total_in_lo32 == 0) s->strm->total_in_hi32++;
  307.       }
  308.  
  309.    } else {
  310.  
  311.       /*-- general, uncommon case --*/
  312.       while (True) {
  313.          /*-- block full? --*/
  314.          if (s->nblock >= s->nblockMAX) break;
  315.          /*-- no input? --*/
  316.          if (s->strm->avail_in == 0) break;
  317.          /*-- flush/finish end? --*/
  318.          if (s->avail_in_expect == 0) break;
  319.          progress_in = True;
  320.          ADD_CHAR_TO_BLOCK ( s, (UInt32)(*((UChar*)(s->strm->next_in))) );
  321.          s->strm->next_in++;
  322.          s->strm->avail_in--;
  323.          s->strm->total_in_lo32++;
  324.          if (s->strm->total_in_lo32 == 0) s->strm->total_in_hi32++;
  325.          s->avail_in_expect--;
  326.       }
  327.    }
  328.    return progress_in;
  329. }
  330.  
  331.  
  332. /*---------------------------------------------------*/
  333. static
  334. Bool copy_output_until_stop ( EState* s )
  335. {
  336.    Bool progress_out = False;
  337.  
  338.    while (True) {
  339.  
  340.       /*-- no output space? --*/
  341.       if (s->strm->avail_out == 0) break;
  342.  
  343.       /*-- block done? --*/
  344.       if (s->state_out_pos >= s->numZ) break;
  345.  
  346.       progress_out = True;
  347.       *(s->strm->next_out) = s->zbits[s->state_out_pos];
  348.       s->state_out_pos++;
  349.       s->strm->avail_out--;
  350.       s->strm->next_out++;
  351.       s->strm->total_out_lo32++;
  352.       if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
  353.    }
  354.  
  355.    return progress_out;
  356. }
  357.  
  358.  
  359. /*---------------------------------------------------*/
  360. static
  361. Bool handle_compress ( bz_stream* strm )
  362. {
  363.    Bool progress_in  = False;
  364.    Bool progress_out = False;
  365.    EState* s = strm->state;
  366.    
  367.    while (True) {
  368.  
  369.       if (s->state == BZ_S_OUTPUT) {
  370.          progress_out |= copy_output_until_stop ( s );
  371.          if (s->state_out_pos < s->numZ) break;
  372.          if (s->mode == BZ_M_FINISHING &&
  373.              s->avail_in_expect == 0 &&
  374.              isempty_RL(s)) break;
  375.          prepare_new_block ( s );
  376.          s->state = BZ_S_INPUT;
  377.          if (s->mode == BZ_M_FLUSHING &&
  378.              s->avail_in_expect == 0 &&
  379.              isempty_RL(s)) break;
  380.       }
  381.  
  382.       if (s->state == BZ_S_INPUT) {
  383.          progress_in |= copy_input_until_stop ( s );
  384.          if (s->mode != BZ_M_RUNNING && s->avail_in_expect == 0) {
  385.             flush_RL ( s );
  386.             BZ2_compressBlock ( s, (Bool)(s->mode == BZ_M_FINISHING) );
  387.             s->state = BZ_S_OUTPUT;
  388.          }
  389.          else
  390.          if (s->nblock >= s->nblockMAX) {
  391.             BZ2_compressBlock ( s, False );
  392.             s->state = BZ_S_OUTPUT;
  393.          }
  394.          else
  395.          if (s->strm->avail_in == 0) {
  396.             break;
  397.          }
  398.       }
  399.  
  400.    }
  401.  
  402.    return progress_in || progress_out;
  403. }
  404.  
  405.  
  406. /*---------------------------------------------------*/
  407. int BZ_API(BZ2_bzCompress) ( bz_stream *strm, int action )
  408. {
  409.    Bool progress;
  410.    EState* s;
  411.    if (strm == NULL) return BZ_PARAM_ERROR;
  412.    s = strm->state;
  413.    if (s == NULL) return BZ_PARAM_ERROR;
  414.    if (s->strm != strm) return BZ_PARAM_ERROR;
  415.  
  416.    preswitch:
  417.    switch (s->mode) {
  418.  
  419.       case BZ_M_IDLE:
  420.          return BZ_SEQUENCE_ERROR;
  421.  
  422.       case BZ_M_RUNNING:
  423.          if (action == BZ_RUN) {
  424.             progress = handle_compress ( strm );
  425.             return progress ? BZ_RUN_OK : BZ_PARAM_ERROR;
  426.          }
  427.          else
  428.          if (action == BZ_FLUSH) {
  429.             s->avail_in_expect = strm->avail_in;
  430.             s->mode = BZ_M_FLUSHING;
  431.             goto preswitch;
  432.          }
  433.          else
  434.          if (action == BZ_FINISH) {
  435.             s->avail_in_expect = strm->avail_in;
  436.             s->mode = BZ_M_FINISHING;
  437.             goto preswitch;
  438.          }
  439.          else
  440.             return BZ_PARAM_ERROR;
  441.  
  442.       case BZ_M_FLUSHING:
  443.          if (action != BZ_FLUSH) return BZ_SEQUENCE_ERROR;
  444.          if (s->avail_in_expect != s->strm->avail_in)
  445.             return BZ_SEQUENCE_ERROR;
  446.          progress = handle_compress ( strm );
  447.          if (s->avail_in_expect > 0 || !isempty_RL(s) ||
  448.              s->state_out_pos < s->numZ) return BZ_FLUSH_OK;
  449.          s->mode = BZ_M_RUNNING;
  450.          return BZ_RUN_OK;
  451.  
  452.       case BZ_M_FINISHING:
  453.          if (action != BZ_FINISH) return BZ_SEQUENCE_ERROR;
  454.          if (s->avail_in_expect != s->strm->avail_in)
  455.             return BZ_SEQUENCE_ERROR;
  456.          progress = handle_compress ( strm );
  457.          if (!progress) return BZ_SEQUENCE_ERROR;
  458.          if (s->avail_in_expect > 0 || !isempty_RL(s) ||
  459.              s->state_out_pos < s->numZ) return BZ_FINISH_OK;
  460.          s->mode = BZ_M_IDLE;
  461.          return BZ_STREAM_END;
  462.    }
  463.    return BZ_OK; /*--not reached--*/
  464. }
  465.  
  466.  
  467. /*---------------------------------------------------*/
  468. int BZ_API(BZ2_bzCompressEnd)  ( bz_stream *strm )
  469. {
  470.    EState* s;
  471.    if (strm == NULL) return BZ_PARAM_ERROR;
  472.    s = strm->state;
  473.    if (s == NULL) return BZ_PARAM_ERROR;
  474.    if (s->strm != strm) return BZ_PARAM_ERROR;
  475.  
  476.    if (s->arr1 != NULL) BZFREE(s->arr1);
  477.    if (s->arr2 != NULL) BZFREE(s->arr2);
  478.    if (s->ftab != NULL) BZFREE(s->ftab);
  479.    BZFREE(strm->state);
  480.  
  481.    strm->state = NULL;  
  482.  
  483.    return BZ_OK;
  484. }
  485.  
  486.  
  487. /*---------------------------------------------------*/
  488. /*--- Decompression stuff                         ---*/
  489. /*---------------------------------------------------*/
  490.  
  491. /*---------------------------------------------------*/
  492. int BZ_API(BZ2_bzDecompressInit)
  493.                      ( bz_stream* strm,
  494.                        int        verbosity,
  495.                        int        small )
  496. {
  497.    DState* s;
  498.  
  499.    if (!bz_config_ok()) return BZ_CONFIG_ERROR;
  500.  
  501.    if (strm == NULL) return BZ_PARAM_ERROR;
  502.    if (small != 0 && small != 1) return BZ_PARAM_ERROR;
  503.    if (verbosity < 0 || verbosity > 4) return BZ_PARAM_ERROR;
  504.  
  505.    if (strm->bzalloc == NULL) strm->bzalloc = default_bzalloc;
  506.    if (strm->bzfree == NULL) strm->bzfree = default_bzfree;
  507.  
  508.    s = BZALLOC( sizeof(DState) );
  509.    if (s == NULL) return BZ_MEM_ERROR;
  510.    s->strm                  = strm;
  511.    strm->state              = s;
  512.    s->state                 = BZ_X_MAGIC_1;
  513.    s->bsLive                = 0;
  514.    s->bsBuff                = 0;
  515.    s->calculatedCombinedCRC = 0;
  516.    strm->total_in_lo32      = 0;
  517.    strm->total_in_hi32      = 0;
  518.    strm->total_out_lo32     = 0;
  519.    strm->total_out_hi32     = 0;
  520.    s->smallDecompress       = (Bool)small;
  521.    s->ll4                   = NULL;
  522.    s->ll16                  = NULL;
  523.    s->tt                    = NULL;
  524.    s->currBlockNo           = 0;
  525.    s->verbosity             = verbosity;
  526.  
  527.    return BZ_OK;
  528. }
  529.  
  530.  
  531. /*---------------------------------------------------*/
  532. /* Return  True iff data corruption is discovered.
  533.    Returns False if there is no problem.
  534. */
  535. static
  536. Bool unRLE_obuf_to_output_FAST ( DState* s )
  537. {
  538.    UChar k1;
  539.  
  540.    if (s->blockRandomised) {
  541.  
  542.       while (True) {
  543.          /* try to finish existing run */
  544.          while (True) {
  545.             if (s->strm->avail_out == 0) return False;
  546.             if (s->state_out_len == 0) break;
  547.             *( (UChar*)(s->strm->next_out) ) = s->state_out_ch;
  548.             BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch );
  549.             s->state_out_len--;
  550.             s->strm->next_out++;
  551.             s->strm->avail_out--;
  552.             s->strm->total_out_lo32++;
  553.             if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
  554.          }
  555.  
  556.          /* can a new run be started? */
  557.          if (s->nblock_used == s->save_nblock+1) return False;
  558.                
  559.          /* Only caused by corrupt data stream? */
  560.          if (s->nblock_used > s->save_nblock+1)
  561.             return True;
  562.    
  563.          s->state_out_len = 1;
  564.          s->state_out_ch = s->k0;
  565.          BZ_GET_FAST(k1); BZ_RAND_UPD_MASK;
  566.          k1 ^= BZ_RAND_MASK; s->nblock_used++;
  567.          if (s->nblock_used == s->save_nblock+1) continue;
  568.          if (k1 != s->k0) { s->k0 = k1; continue; };
  569.    
  570.          s->state_out_len = 2;
  571.          BZ_GET_FAST(k1); BZ_RAND_UPD_MASK;
  572.          k1 ^= BZ_RAND_MASK; s->nblock_used++;
  573.          if (s->nblock_used == s->save_nblock+1) continue;
  574.          if (k1 != s->k0) { s->k0 = k1; continue; };
  575.    
  576.          s->state_out_len = 3;
  577.          BZ_GET_FAST(k1); BZ_RAND_UPD_MASK;
  578.          k1 ^= BZ_RAND_MASK; s->nblock_used++;
  579.          if (s->nblock_used == s->save_nblock+1) continue;
  580.          if (k1 != s->k0) { s->k0 = k1; continue; };
  581.    
  582.          BZ_GET_FAST(k1); BZ_RAND_UPD_MASK;
  583.          k1 ^= BZ_RAND_MASK; s->nblock_used++;
  584.          s->state_out_len = ((Int32)k1) + 4;
  585.          BZ_GET_FAST(s->k0); BZ_RAND_UPD_MASK;
  586.          s->k0 ^= BZ_RAND_MASK; s->nblock_used++;
  587.       }
  588.  
  589.    } else {
  590.  
  591.       /* restore */
  592.       UInt32        c_calculatedBlockCRC = s->calculatedBlockCRC;
  593.       UChar         c_state_out_ch       = s->state_out_ch;
  594.       Int32         c_state_out_len      = s->state_out_len;
  595.       Int32         c_nblock_used        = s->nblock_used;
  596.       Int32         c_k0                 = s->k0;
  597.       UInt32*       c_tt                 = s->tt;
  598.       UInt32        c_tPos               = s->tPos;
  599.       char*         cs_next_out          = s->strm->next_out;
  600.       unsigned int  cs_avail_out         = s->strm->avail_out;
  601.       /* end restore */
  602.  
  603.       UInt32       avail_out_INIT = cs_avail_out;
  604.       Int32        s_save_nblockPP = s->save_nblock+1;
  605.       unsigned int total_out_lo32_old;
  606.  
  607.       while (True) {
  608.  
  609.          /* try to finish existing run */
  610.          if (c_state_out_len > 0) {
  611.             while (True) {
  612.                if (cs_avail_out == 0) goto return_notr;
  613.                if (c_state_out_len == 1) break;
  614.                *( (UChar*)(cs_next_out) ) = c_state_out_ch;
  615.                BZ_UPDATE_CRC ( c_calculatedBlockCRC, c_state_out_ch );
  616.                c_state_out_len--;
  617.                cs_next_out++;
  618.                cs_avail_out--;
  619.             }
  620.             s_state_out_len_eq_one:
  621.             {
  622.                if (cs_avail_out == 0) {
  623.                   c_state_out_len = 1; goto return_notr;
  624.                };
  625.                *( (UChar*)(cs_next_out) ) = c_state_out_ch;
  626.                BZ_UPDATE_CRC ( c_calculatedBlockCRC, c_state_out_ch );
  627.                cs_next_out++;
  628.                cs_avail_out--;
  629.             }
  630.          }  
  631.          /* Only caused by corrupt data stream? */
  632.          if (c_nblock_used > s_save_nblockPP)
  633.             return True;
  634.  
  635.          /* can a new run be started? */
  636.          if (c_nblock_used == s_save_nblockPP) {
  637.             c_state_out_len = 0; goto return_notr;
  638.          };  
  639.          c_state_out_ch = c_k0;
  640.          BZ_GET_FAST_C(k1); c_nblock_used++;
  641.          if (k1 != c_k0) {
  642.             c_k0 = k1; goto s_state_out_len_eq_one;
  643.          };
  644.          if (c_nblock_used == s_save_nblockPP)
  645.             goto s_state_out_len_eq_one;
  646.    
  647.          c_state_out_len = 2;
  648.          BZ_GET_FAST_C(k1); c_nblock_used++;
  649.          if (c_nblock_used == s_save_nblockPP) continue;
  650.          if (k1 != c_k0) { c_k0 = k1; continue; };
  651.    
  652.          c_state_out_len = 3;
  653.          BZ_GET_FAST_C(k1); c_nblock_used++;
  654.          if (c_nblock_used == s_save_nblockPP) continue;
  655.          if (k1 != c_k0) { c_k0 = k1; continue; };
  656.    
  657.          BZ_GET_FAST_C(k1); c_nblock_used++;
  658.          c_state_out_len = ((Int32)k1) + 4;
  659.          BZ_GET_FAST_C(c_k0); c_nblock_used++;
  660.       }
  661.  
  662.       return_notr:
  663.       total_out_lo32_old = s->strm->total_out_lo32;
  664.       s->strm->total_out_lo32 += (avail_out_INIT - cs_avail_out);
  665.       if (s->strm->total_out_lo32 < total_out_lo32_old)
  666.          s->strm->total_out_hi32++;
  667.  
  668.       /* save */
  669.       s->calculatedBlockCRC = c_calculatedBlockCRC;
  670.       s->state_out_ch       = c_state_out_ch;
  671.       s->state_out_len      = c_state_out_len;
  672.       s->nblock_used        = c_nblock_used;
  673.       s->k0                 = c_k0;
  674.       s->tt                 = c_tt;
  675.       s->tPos               = c_tPos;
  676.       s->strm->next_out     = cs_next_out;
  677.       s->strm->avail_out    = cs_avail_out;
  678.       /* end save */
  679.    }
  680.    return False;
  681. }
  682.  
  683.  
  684.  
  685. /*---------------------------------------------------*/
  686. __inline__ Int32 BZ2_indexIntoF ( Int32 indx, Int32 *cftab )
  687. {
  688.    Int32 nb, na, mid;
  689.    nb = 0;
  690.    na = 256;
  691.    do {
  692.       mid = (nb + na) >> 1;
  693.       if (indx >= cftab[mid]) nb = mid; else na = mid;
  694.    }
  695.    while (na - nb != 1);
  696.    return nb;
  697. }
  698.  
  699.  
  700. /*---------------------------------------------------*/
  701. /* Return  True iff data corruption is discovered.
  702.    Returns False if there is no problem.
  703. */
  704. static
  705. Bool unRLE_obuf_to_output_SMALL ( DState* s )
  706. {
  707.    UChar k1;
  708.  
  709.    if (s->blockRandomised) {
  710.  
  711.       while (True) {
  712.          /* try to finish existing run */
  713.          while (True) {
  714.             if (s->strm->avail_out == 0) return False;
  715.             if (s->state_out_len == 0) break;
  716.             *( (UChar*)(s->strm->next_out) ) = s->state_out_ch;
  717.             BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch );
  718.             s->state_out_len--;
  719.             s->strm->next_out++;
  720.             s->strm->avail_out--;
  721.             s->strm->total_out_lo32++;
  722.             if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
  723.          }
  724.    
  725.          /* can a new run be started? */
  726.          if (s->nblock_used == s->save_nblock+1) return False;
  727.  
  728.          /* Only caused by corrupt data stream? */
  729.          if (s->nblock_used > s->save_nblock+1)
  730.             return True;
  731.    
  732.          s->state_out_len = 1;
  733.          s->state_out_ch = s->k0;
  734.          BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK;
  735.          k1 ^= BZ_RAND_MASK; s->nblock_used++;
  736.          if (s->nblock_used == s->save_nblock+1) continue;
  737.          if (k1 != s->k0) { s->k0 = k1; continue; };
  738.    
  739.          s->state_out_len = 2;
  740.          BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK;
  741.          k1 ^= BZ_RAND_MASK; s->nblock_used++;
  742.          if (s->nblock_used == s->save_nblock+1) continue;
  743.          if (k1 != s->k0) { s->k0 = k1; continue; };
  744.    
  745.          s->state_out_len = 3;
  746.          BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK;
  747.          k1 ^= BZ_RAND_MASK; s->nblock_used++;
  748.          if (s->nblock_used == s->save_nblock+1) continue;
  749.          if (k1 != s->k0) { s->k0 = k1; continue; };
  750.    
  751.          BZ_GET_SMALL(k1); BZ_RAND_UPD_MASK;
  752.          k1 ^= BZ_RAND_MASK; s->nblock_used++;
  753.          s->state_out_len = ((Int32)k1) + 4;
  754.          BZ_GET_SMALL(s->k0); BZ_RAND_UPD_MASK;
  755.          s->k0 ^= BZ_RAND_MASK; s->nblock_used++;
  756.       }
  757.  
  758.    } else {
  759.  
  760.       while (True) {
  761.          /* try to finish existing run */
  762.          while (True) {
  763.             if (s->strm->avail_out == 0) return False;
  764.             if (s->state_out_len == 0) break;
  765.             *( (UChar*)(s->strm->next_out) ) = s->state_out_ch;
  766.             BZ_UPDATE_CRC ( s->calculatedBlockCRC, s->state_out_ch );
  767.             s->state_out_len--;
  768.             s->strm->next_out++;
  769.             s->strm->avail_out--;
  770.             s->strm->total_out_lo32++;
  771.             if (s->strm->total_out_lo32 == 0) s->strm->total_out_hi32++;
  772.          }
  773.    
  774.          /* can a new run be started? */
  775.          if (s->nblock_used == s->save_nblock+1) return False;
  776.  
  777.          /* Only caused by corrupt data stream? */
  778.          if (s->nblock_used > s->save_nblock+1)
  779.             return True;
  780.    
  781.          s->state_out_len = 1;
  782.          s->state_out_ch = s->k0;
  783.          BZ_GET_SMALL(k1); s->nblock_used++;
  784.          if (s->nblock_used == s->save_nblock+1) continue;
  785.          if (k1 != s->k0) { s->k0 = k1; continue; };
  786.    
  787.          s->state_out_len = 2;
  788.          BZ_GET_SMALL(k1); s->nblock_used++;
  789.          if (s->nblock_used == s->save_nblock+1) continue;
  790.          if (k1 != s->k0) { s->k0 = k1; continue; };
  791.    
  792.          s->state_out_len = 3;
  793.          BZ_GET_SMALL(k1); s->nblock_used++;
  794.          if (s->nblock_used == s->save_nblock+1) continue;
  795.          if (k1 != s->k0) { s->k0 = k1; continue; };
  796.    
  797.          BZ_GET_SMALL(k1); s->nblock_used++;
  798.          s->state_out_len = ((Int32)k1) + 4;
  799.          BZ_GET_SMALL(s->k0); s->nblock_used++;
  800.       }
  801.  
  802.    }
  803. }
  804.  
  805.  
  806. /*---------------------------------------------------*/
  807. int BZ_API(BZ2_bzDecompress) ( bz_stream *strm )
  808. {
  809.    Bool    corrupt;
  810.    DState* s;
  811.    if (strm == NULL) return BZ_PARAM_ERROR;
  812.    s = strm->state;
  813.    if (s == NULL) return BZ_PARAM_ERROR;
  814.    if (s->strm != strm) return BZ_PARAM_ERROR;
  815.  
  816.    while (True) {
  817.       if (s->state == BZ_X_IDLE) return BZ_SEQUENCE_ERROR;
  818.       if (s->state == BZ_X_OUTPUT) {
  819.          if (s->smallDecompress)
  820.             corrupt = unRLE_obuf_to_output_SMALL ( s ); else
  821.             corrupt = unRLE_obuf_to_output_FAST  ( s );
  822.          if (corrupt) return BZ_DATA_ERROR;
  823.          if (s->nblock_used == s->save_nblock+1 && s->state_out_len == 0) {
  824.             BZ_FINALISE_CRC ( s->calculatedBlockCRC );
  825.             if (s->verbosity >= 3)
  826.                VPrintf2 ( " {0x%08x, 0x%08x}", s->storedBlockCRC,
  827.                           s->calculatedBlockCRC );
  828.             if (s->verbosity >= 2) VPrintf0 ( "]" );
  829.             if (s->calculatedBlockCRC != s->storedBlockCRC)
  830.                return BZ_DATA_ERROR;
  831.             s->calculatedCombinedCRC
  832.                = (s->calculatedCombinedCRC << 1) |
  833.                     (s->calculatedCombinedCRC >> 31);
  834.             s->calculatedCombinedCRC ^= s->calculatedBlockCRC;
  835.             s->state = BZ_X_BLKHDR_1;
  836.          } else {
  837.             return BZ_OK;
  838.          }
  839.       }
  840.       if (s->state >= BZ_X_MAGIC_1) {
  841.          Int32 r = BZ2_decompress ( s );
  842.          if (r == BZ_STREAM_END) {
  843.             if (s->verbosity >= 3)
  844.                VPrintf2 ( "\n    combined CRCs: stored = 0x%08x, computed = 0x%08x",
  845.                           s->storedCombinedCRC, s->calculatedCombinedCRC );
  846.             if (s->calculatedCombinedCRC != s->storedCombinedCRC)
  847.                return BZ_DATA_ERROR;
  848.             return r;
  849.          }
  850.          if (s->state != BZ_X_OUTPUT) return r;
  851.       }
  852.    }
  853.  
  854.    AssertH ( 0, 6001 );
  855.  
  856.    return 0;  /*NOTREACHED*/
  857. }
  858.  
  859.  
  860. /*---------------------------------------------------*/
  861. int BZ_API(BZ2_bzDecompressEnd)  ( bz_stream *strm )
  862. {
  863.    DState* s;
  864.    if (strm == NULL) return BZ_PARAM_ERROR;
  865.    s = strm->state;
  866.    if (s == NULL) return BZ_PARAM_ERROR;
  867.    if (s->strm != strm) return BZ_PARAM_ERROR;
  868.  
  869.    if (s->tt   != NULL) BZFREE(s->tt);
  870.    if (s->ll16 != NULL) BZFREE(s->ll16);
  871.    if (s->ll4  != NULL) BZFREE(s->ll4);
  872.  
  873.    BZFREE(strm->state);
  874.    strm->state = NULL;
  875.  
  876.    return BZ_OK;
  877. }
  878.  
  879.  
  880. #ifndef BZ_NO_STDIO
  881. /*---------------------------------------------------*/
  882. /*--- File I/O stuff                              ---*/
  883. /*---------------------------------------------------*/
  884.  
  885. #define BZ_SETERR(eee)                    \
  886. {                                         \
  887.    if (bzerror != NULL) *bzerror = eee;   \
  888.    if (bzf != NULL) bzf->lastErr = eee;   \
  889. }
  890.  
  891. typedef
  892.    struct {
  893.       FILE*     handle;
  894.       Char      buf[BZ_MAX_UNUSED];
  895.       Int32     bufN;
  896.       Bool      writing;
  897.       bz_stream strm;
  898.       Int32     lastErr;
  899.       Bool      initialisedOk;
  900.    }
  901.    bzFile;
  902.  
  903.  
  904. /*---------------------------------------------*/
  905. static Bool myfeof ( FILE* f )
  906. {
  907.    Int32 c = fgetc ( f );
  908.    if (c == EOF) return True;
  909.    ungetc ( c, f );
  910.    return False;
  911. }
  912.  
  913.  
  914. /*---------------------------------------------------*/
  915. BZFILE* BZ_API(BZ2_bzWriteOpen)
  916.                     ( int*  bzerror,      
  917.                       FILE* f,
  918.                       int   blockSize100k,
  919.                       int   verbosity,
  920.                       int   workFactor )
  921. {
  922.    Int32   ret;
  923.    bzFile* bzf = NULL;
  924.  
  925.    BZ_SETERR(BZ_OK);
  926.  
  927.    if (f == NULL ||
  928.        (blockSize100k < 1 || blockSize100k > 9) ||
  929.        (workFactor < 0 || workFactor > 250) ||
  930.        (verbosity < 0 || verbosity > 4))
  931.       { BZ_SETERR(BZ_PARAM_ERROR); return NULL; };
  932.  
  933.    if (ferror(f))
  934.       { BZ_SETERR(BZ_IO_ERROR); return NULL; };
  935.  
  936.    bzf = malloc ( sizeof(bzFile) );
  937.    if (bzf == NULL)
  938.       { BZ_SETERR(BZ_MEM_ERROR); return NULL; };
  939.  
  940.    BZ_SETERR(BZ_OK);
  941.    bzf->initialisedOk = False;
  942.    bzf->bufN          = 0;
  943.    bzf->handle        = f;
  944.    bzf->writing       = True;
  945.    bzf->strm.bzalloc  = NULL;
  946.    bzf->strm.bzfree   = NULL;
  947.    bzf->strm.opaque   = NULL;
  948.  
  949.    if (workFactor == 0) workFactor = 30;
  950.    ret = BZ2_bzCompressInit ( &(bzf->strm), blockSize100k,
  951.                               verbosity, workFactor );
  952.    if (ret != BZ_OK)
  953.       { BZ_SETERR(ret); free(bzf); return NULL; };
  954.  
  955.    bzf->strm.avail_in = 0;
  956.    bzf->initialisedOk = True;
  957.    return bzf;  
  958. }
  959.  
  960.  
  961.  
  962. /*---------------------------------------------------*/
  963. void BZ_API(BZ2_bzWrite)
  964.              ( int*    bzerror,
  965.                BZFILE* b,
  966.                void*   buf,
  967.                int     len )
  968. {
  969.    Int32 n, n2, ret;
  970.    bzFile* bzf = (bzFile*)b;
  971.  
  972.    BZ_SETERR(BZ_OK);
  973.    if (bzf == NULL || buf == NULL || len < 0)
  974.       { BZ_SETERR(BZ_PARAM_ERROR); return; };
  975.    if (!(bzf->writing))
  976.       { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
  977.    if (ferror(bzf->handle))
  978.       { BZ_SETERR(BZ_IO_ERROR); return; };
  979.  
  980.    if (len == 0)
  981.       { BZ_SETERR(BZ_OK); return; };
  982.  
  983.    bzf->strm.avail_in = len;
  984.    bzf->strm.next_in  = buf;
  985.  
  986.    while (True) {
  987.       bzf->strm.avail_out = BZ_MAX_UNUSED;
  988.       bzf->strm.next_out = bzf->buf;
  989.       ret = BZ2_bzCompress ( &(bzf->strm), BZ_RUN );
  990.       if (ret != BZ_RUN_OK)
  991.          { BZ_SETERR(ret); return; };
  992.  
  993.       if (bzf->strm.avail_out < BZ_MAX_UNUSED) {
  994.          n = BZ_MAX_UNUSED - bzf->strm.avail_out;
  995.          n2 = fwrite ( (void*)(bzf->buf), sizeof(UChar),
  996.                        n, bzf->handle );
  997.          if (n != n2 || ferror(bzf->handle))
  998.             { BZ_SETERR(BZ_IO_ERROR); return; };
  999.       }
  1000.  
  1001.       if (bzf->strm.avail_in == 0)
  1002.          { BZ_SETERR(BZ_OK); return; };
  1003.    }
  1004. }
  1005.  
  1006.  
  1007. /*---------------------------------------------------*/
  1008. void BZ_API(BZ2_bzWriteClose)
  1009.                   ( int*          bzerror,
  1010.                     BZFILE*       b,
  1011.                     int           abandon,
  1012.                     unsigned int* nbytes_in,
  1013.                     unsigned int* nbytes_out )
  1014. {
  1015.    BZ2_bzWriteClose64 ( bzerror, b, abandon,
  1016.                         nbytes_in, NULL, nbytes_out, NULL );
  1017. }
  1018.  
  1019.  
  1020. void BZ_API(BZ2_bzWriteClose64)
  1021.                   ( int*          bzerror,
  1022.                     BZFILE*       b,
  1023.                     int           abandon,
  1024.                     unsigned int* nbytes_in_lo32,
  1025.                     unsigned int* nbytes_in_hi32,
  1026.                     unsigned int* nbytes_out_lo32,
  1027.                     unsigned int* nbytes_out_hi32 )
  1028. {
  1029.    Int32   n, n2, ret;
  1030.    bzFile* bzf = (bzFile*)b;
  1031.  
  1032.    if (bzf == NULL)
  1033.       { BZ_SETERR(BZ_OK); return; };
  1034.    if (!(bzf->writing))
  1035.       { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
  1036.    if (ferror(bzf->handle))
  1037.       { BZ_SETERR(BZ_IO_ERROR); return; };
  1038.  
  1039.    if (nbytes_in_lo32 != NULL) *nbytes_in_lo32 = 0;
  1040.    if (nbytes_in_hi32 != NULL) *nbytes_in_hi32 = 0;
  1041.    if (nbytes_out_lo32 != NULL) *nbytes_out_lo32 = 0;
  1042.    if (nbytes_out_hi32 != NULL) *nbytes_out_hi32 = 0;
  1043.  
  1044.    if ((!abandon) && bzf->lastErr == BZ_OK) {
  1045.       while (True) {
  1046.          bzf->strm.avail_out = BZ_MAX_UNUSED;
  1047.          bzf->strm.next_out = bzf->buf;
  1048.          ret = BZ2_bzCompress ( &(bzf->strm), BZ_FINISH );
  1049.          if (ret != BZ_FINISH_OK && ret != BZ_STREAM_END)
  1050.             { BZ_SETERR(ret); return; };
  1051.  
  1052.          if (bzf->strm.avail_out < BZ_MAX_UNUSED) {
  1053.             n = BZ_MAX_UNUSED - bzf->strm.avail_out;
  1054.             n2 = fwrite ( (void*)(bzf->buf), sizeof(UChar),
  1055.                           n, bzf->handle );
  1056.             if (n != n2 || ferror(bzf->handle))
  1057.                { BZ_SETERR(BZ_IO_ERROR); return; };
  1058.          }
  1059.  
  1060.          if (ret == BZ_STREAM_END) break;
  1061.       }
  1062.    }
  1063.  
  1064.    if ( !abandon && !ferror ( bzf->handle ) ) {
  1065.       fflush ( bzf->handle );
  1066.       if (ferror(bzf->handle))
  1067.          { BZ_SETERR(BZ_IO_ERROR); return; };
  1068.    }
  1069.  
  1070.    if (nbytes_in_lo32 != NULL)
  1071.       *nbytes_in_lo32 = bzf->strm.total_in_lo32;
  1072.    if (nbytes_in_hi32 != NULL)
  1073.       *nbytes_in_hi32 = bzf->strm.total_in_hi32;
  1074.    if (nbytes_out_lo32 != NULL)
  1075.       *nbytes_out_lo32 = bzf->strm.total_out_lo32;
  1076.    if (nbytes_out_hi32 != NULL)
  1077.       *nbytes_out_hi32 = bzf->strm.total_out_hi32;
  1078.  
  1079.    BZ_SETERR(BZ_OK);
  1080.    BZ2_bzCompressEnd ( &(bzf->strm) );
  1081.    free ( bzf );
  1082. }
  1083.  
  1084.  
  1085. /*---------------------------------------------------*/
  1086. BZFILE* BZ_API(BZ2_bzReadOpen)
  1087.                    ( int*  bzerror,
  1088.                      FILE* f,
  1089.                      int   verbosity,
  1090.                      int   small,
  1091.                      void* unused,
  1092.                      int   nUnused )
  1093. {
  1094.    bzFile* bzf = NULL;
  1095.    int     ret;
  1096.  
  1097.    BZ_SETERR(BZ_OK);
  1098.  
  1099.    if (f == NULL ||
  1100.        (small != 0 && small != 1) ||
  1101.        (verbosity < 0 || verbosity > 4) ||
  1102.        (unused == NULL && nUnused != 0) ||
  1103.        (unused != NULL && (nUnused < 0 || nUnused > BZ_MAX_UNUSED)))
  1104.       { BZ_SETERR(BZ_PARAM_ERROR); return NULL; };
  1105.  
  1106.    if (ferror(f))
  1107.       { BZ_SETERR(BZ_IO_ERROR); return NULL; };
  1108.  
  1109.    bzf = malloc ( sizeof(bzFile) );
  1110.    if (bzf == NULL)
  1111.       { BZ_SETERR(BZ_MEM_ERROR); return NULL; };
  1112.  
  1113.    BZ_SETERR(BZ_OK);
  1114.  
  1115.    bzf->initialisedOk = False;
  1116.    bzf->handle        = f;
  1117.    bzf->bufN          = 0;
  1118.    bzf->writing       = False;
  1119.    bzf->strm.bzalloc  = NULL;
  1120.    bzf->strm.bzfree   = NULL;
  1121.    bzf->strm.opaque   = NULL;
  1122.    
  1123.    while (nUnused > 0) {
  1124.       bzf->buf[bzf->bufN] = *((UChar*)(unused)); bzf->bufN++;
  1125.       unused = ((void*)( 1 + ((UChar*)(unused))  ));
  1126.       nUnused--;
  1127.    }
  1128.  
  1129.    ret = BZ2_bzDecompressInit ( &(bzf->strm), verbosity, small );
  1130.    if (ret != BZ_OK)
  1131.       { BZ_SETERR(ret); free(bzf); return NULL; };
  1132.  
  1133.    bzf->strm.avail_in = bzf->bufN;
  1134.    bzf->strm.next_in  = bzf->buf;
  1135.  
  1136.    bzf->initialisedOk = True;
  1137.    return bzf;  
  1138. }
  1139.  
  1140.  
  1141. /*---------------------------------------------------*/
  1142. void BZ_API(BZ2_bzReadClose) ( int *bzerror, BZFILE *b )
  1143. {
  1144.    bzFile* bzf = (bzFile*)b;
  1145.  
  1146.    BZ_SETERR(BZ_OK);
  1147.    if (bzf == NULL)
  1148.       { BZ_SETERR(BZ_OK); return; };
  1149.  
  1150.    if (bzf->writing)
  1151.       { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
  1152.  
  1153.    if (bzf->initialisedOk)
  1154.       (void)BZ2_bzDecompressEnd ( &(bzf->strm) );
  1155.    free ( bzf );
  1156. }
  1157.  
  1158.  
  1159. /*---------------------------------------------------*/
  1160. int BZ_API(BZ2_bzRead)
  1161.            ( int*    bzerror,
  1162.              BZFILE* b,
  1163.              void*   buf,
  1164.              int     len )
  1165. {
  1166.    Int32   n, ret;
  1167.    bzFile* bzf = (bzFile*)b;
  1168.  
  1169.    BZ_SETERR(BZ_OK);
  1170.  
  1171.    if (bzf == NULL || buf == NULL || len < 0)
  1172.       { BZ_SETERR(BZ_PARAM_ERROR); return 0; };
  1173.  
  1174.    if (bzf->writing)
  1175.       { BZ_SETERR(BZ_SEQUENCE_ERROR); return 0; };
  1176.  
  1177.    if (len == 0)
  1178.       { BZ_SETERR(BZ_OK); return 0; };
  1179.  
  1180.    bzf->strm.avail_out = len;
  1181.    bzf->strm.next_out = buf;
  1182.  
  1183.    while (True) {
  1184.  
  1185.       if (ferror(bzf->handle))
  1186.          { BZ_SETERR(BZ_IO_ERROR); return 0; };
  1187.  
  1188.       if (bzf->strm.avail_in == 0 && !myfeof(bzf->handle)) {
  1189.          n = fread ( bzf->buf, sizeof(UChar),
  1190.                      BZ_MAX_UNUSED, bzf->handle );
  1191.          if (ferror(bzf->handle))
  1192.             { BZ_SETERR(BZ_IO_ERROR); return 0; };
  1193.          bzf->bufN = n;
  1194.          bzf->strm.avail_in = bzf->bufN;
  1195.          bzf->strm.next_in = bzf->buf;
  1196.       }
  1197.  
  1198.       ret = BZ2_bzDecompress ( &(bzf->strm) );
  1199.  
  1200.       if (ret != BZ_OK && ret != BZ_STREAM_END)
  1201.          { BZ_SETERR(ret); return 0; };
  1202.  
  1203.       if (ret == BZ_OK && myfeof(bzf->handle) &&
  1204.           bzf->strm.avail_in == 0 && bzf->strm.avail_out > 0)
  1205.          { BZ_SETERR(BZ_UNEXPECTED_EOF); return 0; };
  1206.  
  1207.       if (ret == BZ_STREAM_END)
  1208.          { BZ_SETERR(BZ_STREAM_END);
  1209.            return len - bzf->strm.avail_out; };
  1210.       if (bzf->strm.avail_out == 0)
  1211.          { BZ_SETERR(BZ_OK); return len; };
  1212.      
  1213.    }
  1214.  
  1215.    return 0; /*not reached*/
  1216. }
  1217.  
  1218.  
  1219. /*---------------------------------------------------*/
  1220. void BZ_API(BZ2_bzReadGetUnused)
  1221.                      ( int*    bzerror,
  1222.                        BZFILE* b,
  1223.                        void**  unused,
  1224.                        int*    nUnused )
  1225. {
  1226.    bzFile* bzf = (bzFile*)b;
  1227.    if (bzf == NULL)
  1228.       { BZ_SETERR(BZ_PARAM_ERROR); return; };
  1229.    if (bzf->lastErr != BZ_STREAM_END)
  1230.       { BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
  1231.    if (unused == NULL || nUnused == NULL)
  1232.       { BZ_SETERR(BZ_PARAM_ERROR); return; };
  1233.  
  1234.    BZ_SETERR(BZ_OK);
  1235.    *nUnused = bzf->strm.avail_in;
  1236.    *unused = bzf->strm.next_in;
  1237. }
  1238. #endif
  1239.  
  1240.  
  1241. /*---------------------------------------------------*/
  1242. /*--- Misc convenience stuff                      ---*/
  1243. /*---------------------------------------------------*/
  1244.  
  1245. /*---------------------------------------------------*/
  1246. int BZ_API(BZ2_bzBuffToBuffCompress)
  1247.                          ( char*         dest,
  1248.                            unsigned int* destLen,
  1249.                            char*         source,
  1250.                            unsigned int  sourceLen,
  1251.                            int           blockSize100k,
  1252.                            int           verbosity,
  1253.                            int           workFactor )
  1254. {
  1255.    bz_stream strm;
  1256.    int ret;
  1257.  
  1258.    if (dest == NULL || destLen == NULL ||
  1259.        source == NULL ||
  1260.        blockSize100k < 1 || blockSize100k > 9 ||
  1261.        verbosity < 0 || verbosity > 4 ||
  1262.        workFactor < 0 || workFactor > 250)
  1263.       return BZ_PARAM_ERROR;
  1264.  
  1265.    if (workFactor == 0) workFactor = 30;
  1266.    strm.bzalloc = NULL;
  1267.    strm.bzfree = NULL;
  1268.    strm.opaque = NULL;
  1269.    ret = BZ2_bzCompressInit ( &strm, blockSize100k,
  1270.                               verbosity, workFactor );
  1271.    if (ret != BZ_OK) return ret;
  1272.  
  1273.    strm.next_in = source;
  1274.    strm.next_out = dest;
  1275.    strm.avail_in = sourceLen;
  1276.    strm.avail_out = *destLen;
  1277.  
  1278.    ret = BZ2_bzCompress ( &strm, BZ_FINISH );
  1279.    if (ret == BZ_FINISH_OK) goto output_overflow;
  1280.    if (ret != BZ_STREAM_END) goto errhandler;
  1281.  
  1282.    /* normal termination */
  1283.    *destLen -= strm.avail_out;  
  1284.    BZ2_bzCompressEnd ( &strm );
  1285.    return BZ_OK;
  1286.  
  1287.    output_overflow:
  1288.    BZ2_bzCompressEnd ( &strm );
  1289.    return BZ_OUTBUFF_FULL;
  1290.  
  1291.    errhandler:
  1292.    BZ2_bzCompressEnd ( &strm );
  1293.    return ret;
  1294. }
  1295.  
  1296.  
  1297. /*---------------------------------------------------*/
  1298. int BZ_API(BZ2_bzBuffToBuffDecompress)
  1299.                            ( char*         dest,
  1300.                              unsigned int* destLen,
  1301.                              char*         source,
  1302.                              unsigned int  sourceLen,
  1303.                              int           small,
  1304.                              int           verbosity )
  1305. {
  1306.    bz_stream strm;
  1307.    int ret;
  1308.  
  1309.    if (dest == NULL || destLen == NULL ||
  1310.        source == NULL ||
  1311.        (small != 0 && small != 1) ||
  1312.        verbosity < 0 || verbosity > 4)
  1313.           return BZ_PARAM_ERROR;
  1314.  
  1315.    strm.bzalloc = NULL;
  1316.    strm.bzfree = NULL;
  1317.    strm.opaque = NULL;
  1318.    ret = BZ2_bzDecompressInit ( &strm, verbosity, small );
  1319.    if (ret != BZ_OK) return ret;
  1320.  
  1321.    strm.next_in = source;
  1322.    strm.next_out = dest;
  1323.    strm.avail_in = sourceLen;
  1324.    strm.avail_out = *destLen;
  1325.  
  1326.    ret = BZ2_bzDecompress ( &strm );
  1327.    if (ret == BZ_OK) goto output_overflow_or_eof;
  1328.    if (ret != BZ_STREAM_END) goto errhandler;
  1329.  
  1330.    /* normal termination */
  1331.    *destLen -= strm.avail_out;
  1332.    BZ2_bzDecompressEnd ( &strm );
  1333.    return BZ_OK;
  1334.  
  1335.    output_overflow_or_eof:
  1336.    if (strm.avail_out > 0) {
  1337.       BZ2_bzDecompressEnd ( &strm );
  1338.       return BZ_UNEXPECTED_EOF;
  1339.    } else {
  1340.       BZ2_bzDecompressEnd ( &strm );
  1341.       return BZ_OUTBUFF_FULL;
  1342.    };      
  1343.  
  1344.    errhandler:
  1345.    BZ2_bzDecompressEnd ( &strm );
  1346.    return ret;
  1347. }
  1348.  
  1349.  
  1350. /*---------------------------------------------------*/
  1351. /*--
  1352.    Code contributed by Yoshioka Tsuneo (tsuneo@rr.iij4u.or.jp)
  1353.    to support better zlib compatibility.
  1354.    This code is not _officially_ part of libbzip2 (yet);
  1355.    I haven't tested it, documented it, or considered the
  1356.    threading-safeness of it.
  1357.    If this code breaks, please contact both Yoshioka and me.
  1358. --*/
  1359. /*---------------------------------------------------*/
  1360.  
  1361. /*---------------------------------------------------*/
  1362. /*--
  1363.    return version like "0.9.5d, 4-Sept-1999".
  1364. --*/
  1365. const char * BZ_API(BZ2_bzlibVersion)(void)
  1366. {
  1367.    return BZ_VERSION;
  1368. }
  1369.  
  1370.  
  1371. #ifndef BZ_NO_STDIO
  1372. /*---------------------------------------------------*/
  1373.  
  1374. #if defined(_WIN32) || defined(OS2) || defined(MSDOS)
  1375. #   include <fcntl.h>
  1376. #   include <io.h>
  1377. #   define SET_BINARY_MODE(file) setmode(fileno(file),O_BINARY)
  1378. #else
  1379. #   define SET_BINARY_MODE(file)
  1380. #endif
  1381. static
  1382. BZFILE * bzopen_or_bzdopen
  1383.                ( const char *path,   /* no use when bzdopen */
  1384.                  int fd,             /* no use when bzdopen */
  1385.                  const char *mode,
  1386.                  int open_mode)      /* bzopen: 0, bzdopen:1 */
  1387. {
  1388.    int    bzerr;
  1389.    char   unused[BZ_MAX_UNUSED];
  1390.    int    blockSize100k = 9;
  1391.    int    writing       = 0;
  1392.    char   mode2[10]     = "";
  1393.    FILE   *fp           = NULL;
  1394.    BZFILE *bzfp         = NULL;
  1395.    int    verbosity     = 0;
  1396.    int    workFactor    = 30;
  1397.    int    smallMode     = 0;
  1398.    int    nUnused       = 0;
  1399.  
  1400.    if (mode == NULL) return NULL;
  1401.    while (*mode) {
  1402.       switch (*mode) {
  1403.       case 'r':
  1404.          writing = 0; break;
  1405.       case 'w':
  1406.          writing = 1; break;
  1407.       case 's':
  1408.          smallMode = 1; break;
  1409.       default:
  1410.          if (isdigit((int)(*mode))) {
  1411.             blockSize100k = *mode-BZ_HDR_0;
  1412.          }
  1413.       }
  1414.       mode++;
  1415.    }
  1416.    strcat(mode2, writing ? "w" : "r" );
  1417.    strcat(mode2,"b");   /* binary mode */
  1418.  
  1419.    if (open_mode==0) {
  1420.       if (path==NULL || strcmp(path,"")==0) {
  1421.         fp = (writing ? stdout : stdin);
  1422.         SET_BINARY_MODE(fp);
  1423.       } else {
  1424.         fp = fopen(path,mode2);
  1425.       }
  1426.    } else {
  1427. #ifdef BZ_STRICT_ANSI
  1428.       fp = NULL;
  1429. #else
  1430.       fp = fdopen(fd,mode2);
  1431. #endif
  1432.    }
  1433.    if (fp == NULL) return NULL;
  1434.  
  1435.    if (writing) {
  1436.       /* Guard against total chaos and anarchy -- JRS */
  1437.       if (blockSize100k < 1) blockSize100k = 1;
  1438.       if (blockSize100k > 9) blockSize100k = 9;
  1439.       bzfp = BZ2_bzWriteOpen(&bzerr,fp,blockSize100k,
  1440.                              verbosity,workFactor);
  1441.    } else {
  1442.       bzfp = BZ2_bzReadOpen(&bzerr,fp,verbosity,smallMode,
  1443.                             unused,nUnused);
  1444.    }
  1445.    if (bzfp == NULL) {
  1446.       if (fp != stdin && fp != stdout) fclose(fp);
  1447.       return NULL;
  1448.    }
  1449.    return bzfp;
  1450. }
  1451.  
  1452.  
  1453. /*---------------------------------------------------*/
  1454. /*--
  1455.    open file for read or write.
  1456.       ex) bzopen("file","w9")
  1457.       case path="" or NULL => use stdin or stdout.
  1458. --*/
  1459. BZFILE * BZ_API(BZ2_bzopen)
  1460.                ( const char *path,
  1461.                  const char *mode )
  1462. {
  1463.    return bzopen_or_bzdopen(path,-1,mode,/*bzopen*/0);
  1464. }
  1465.  
  1466.  
  1467. /*---------------------------------------------------*/
  1468. BZFILE * BZ_API(BZ2_bzdopen)
  1469.                ( int fd,
  1470.                  const char *mode )
  1471. {
  1472.    return bzopen_or_bzdopen(NULL,fd,mode,/*bzdopen*/1);
  1473. }
  1474.  
  1475.  
  1476. /*---------------------------------------------------*/
  1477. int BZ_API(BZ2_bzread) (BZFILE* b, void* buf, int len )
  1478. {
  1479.    int bzerr, nread;
  1480.    if (((bzFile*)b)->lastErr == BZ_STREAM_END) return 0;
  1481.    nread = BZ2_bzRead(&bzerr,b,buf,len);
  1482.    if (bzerr == BZ_OK || bzerr == BZ_STREAM_END) {
  1483.       return nread;
  1484.    } else {
  1485.       return -1;
  1486.    }
  1487. }
  1488.  
  1489.  
  1490. /*---------------------------------------------------*/
  1491. int BZ_API(BZ2_bzwrite) (BZFILE* b, void* buf, int len )
  1492. {
  1493.    int bzerr;
  1494.  
  1495.    BZ2_bzWrite(&bzerr,b,buf,len);
  1496.    if(bzerr == BZ_OK){
  1497.       return len;
  1498.    }else{
  1499.       return -1;
  1500.    }
  1501. }
  1502.  
  1503.  
  1504. /*---------------------------------------------------*/
  1505. int BZ_API(BZ2_bzflush) (BZFILE *b)
  1506. {
  1507.    /* do nothing now... */
  1508.    return 0;
  1509. }
  1510.  
  1511.  
  1512. /*---------------------------------------------------*/
  1513. void BZ_API(BZ2_bzclose) (BZFILE* b)
  1514. {
  1515.    int bzerr;
  1516.    FILE *fp;
  1517.    
  1518.    if (b==NULL) {return;}
  1519.    fp = ((bzFile *)b)->handle;
  1520.    if(((bzFile*)b)->writing){
  1521.       BZ2_bzWriteClose(&bzerr,b,0,NULL,NULL);
  1522.       if(bzerr != BZ_OK){
  1523.          BZ2_bzWriteClose(NULL,b,1,NULL,NULL);
  1524.       }
  1525.    }else{
  1526.       BZ2_bzReadClose(&bzerr,b);
  1527.    }
  1528.    if(fp!=stdin && fp!=stdout){
  1529.       fclose(fp);
  1530.    }
  1531. }
  1532.  
  1533.  
  1534. /*---------------------------------------------------*/
  1535. /*--
  1536.    return last error code
  1537. --*/
  1538. static const char *bzerrorstrings[] = {
  1539.        "OK"
  1540.       ,"SEQUENCE_ERROR"
  1541.       ,"PARAM_ERROR"
  1542.       ,"MEM_ERROR"
  1543.       ,"DATA_ERROR"
  1544.       ,"DATA_ERROR_MAGIC"
  1545.       ,"IO_ERROR"
  1546.       ,"UNEXPECTED_EOF"
  1547.       ,"OUTBUFF_FULL"
  1548.       ,"CONFIG_ERROR"
  1549.       ,"???"   /* for future */
  1550.       ,"???"   /* for future */
  1551.       ,"???"   /* for future */
  1552.       ,"???"   /* for future */
  1553.       ,"???"   /* for future */
  1554.       ,"???"   /* for future */
  1555. };
  1556.  
  1557.  
  1558. const char * BZ_API(BZ2_bzerror) (BZFILE *b, int *errnum)
  1559. {
  1560.    int err = ((bzFile *)b)->lastErr;
  1561.  
  1562.    if(err>0) err = 0;
  1563.    *errnum = err;
  1564.    return bzerrorstrings[err*-1];
  1565. }
  1566. #endif
  1567.  
  1568.  
  1569. /*-------------------------------------------------------------*/
  1570. /*--- end                                           bzlib.c ---*/
  1571. /*-------------------------------------------------------------*/
  1572.