ext/Compress/Zlib/Zlib.xs

   1 /* Filename: Zlib.xs
   2  * Author  : Paul Marquess, <pmqs@cpan.org>
   3  * Created : 22nd January 1996
   4  * Version : 2.000
   5  *
   6  *   Copyright (c) 1995-2005 Paul Marquess. All rights reserved.
   7  *   This program is free software; you can redistribute it and/or
   8  *   modify it under the same terms as Perl itself.
   9  *
  10  */
  11
  12 /* Parts of this code are based on the files gzio.c and gzappend.c from
  13  * the standard zlib source distribution. Below are the copyright statements
  14  * from each.
  15  */
  16
  17 /* gzio.c -- IO on .gz files
  18  * Copyright (C) 1995 Jean-loup Gailly.
  19  * For conditions of distribution and use, see copyright notice in zlib.h
  20  */
  21
  22 /* gzappend -- command to append to a gzip file
  23
  24   Copyright (C) 2003 Mark Adler, all rights reserved
  25   version 1.1, 4 Nov 2003
  26 */
  27
  28
  29
  30 #include "EXTERN.h"
  31 #include "perl.h"
  32 #include "XSUB.h"
  33
  34 #include <zlib.h>
  35
  36 /* zlib prior to 1.06 doesn't know about z_off_t */
  37 #ifndef z_off_t
  38 #  define z_off_t   long
  39 #endif
  40
  41 #if  ! defined(ZLIB_VERNUM) || ZLIB_VERNUM < 0x1200
  42 #  define NEED_DUMMY_BYTE_AT_END
  43 #endif
  44
  45 #if  defined(ZLIB_VERNUM) && ZLIB_VERNUM >= 0x1210
  46 #  define MAGIC_APPEND
  47 #endif
  48
  49 #if  defined(ZLIB_VERNUM) && ZLIB_VERNUM >= 0x1221
  50 #  define AT_LEAST_ZLIB_1_2_2_1
  51 #endif
  52
  53 #if  defined(ZLIB_VERNUM) && ZLIB_VERNUM >= 0x1223
  54 #  define AT_LEAST_ZLIB_1_2_2_3
  55 #endif
  56
  57 #if  defined(ZLIB_VERNUM) && ZLIB_VERNUM >= 0x1230
  58 #  define AT_LEAST_ZLIB_1_2_3
  59 #endif
  60
  61 #if 0
  62
  63 #  include "ppport.h"
  64
  65 #else
  66
  67 #  ifndef PERL_VERSION
  68 #    include "patchlevel.h"
  69 #    define PERL_REVISION       5
  70 #    define PERL_VERSION        PATCHLEVEL
  71 #    define PERL_SUBVERSION     SUBVERSION
  72 #  endif
  73
  74 #  if PERL_REVISION == 5 && (PERL_VERSION < 4 || (PERL_VERSION == 4 && PERL_SUBVERSION <= 75 ))
  75
  76 #      define PL_sv_undef       sv_undef
  77 #      define PL_na             na
  78 #      define PL_curcop         curcop
  79 #      define PL_compiling      compiling
  80
  81 #  endif
  82
  83 #  ifndef newSVuv
  84 #      define newSVuv   newSViv
  85 #  endif
  86
  87
  88
  89 #  if PERL_REVISION == 5 && (PERL_VERSION < 8 || (PERL_VERSION == 8 && PERL_SUBVERSION < 4 ))
  90
  91 #    ifdef SvPVbyte_force
  92 #        undef SvPVbyte_force
  93 #    endif
  94
  95 #    define SvPVbyte_force(sv,lp) SvPV_force(sv,lp)
  96
  97 #  endif
  98
  99 #  ifndef SvPVbyte_nolen
 100 #    define SvPVbyte_nolen SvPV_nolen
 101 #  endif
 102
 103 #  ifndef SvPVbyte
 104 #    define SvPVbyte SvPV
 105 #  endif
 106
 107 #  ifndef dTHX
 108 #    define dTHX
 109 #  endif
 110
 111 #  ifndef SvPV_nolen
 112
 113 #  define sv_2pv_nolen(a) my_sv_2pv_nolen(a)
 114
 115 static char *
 116 my_sv_2pv_nolen(register SV *sv)
 117 {
 118   dTHX;
 119   STRLEN n_a;
 120   return sv_2pv(sv, &n_a);
 121 }
 122
 123
 124 /* SvPV_nolen depends on sv_2pv_nolen */
 125 #  define SvPV_nolen(sv) \
 126           ((SvFLAGS(sv) & (SVf_POK)) == SVf_POK \
 127            ? SvPVX(sv) : sv_2pv_nolen(sv))
 128
 129
 130 #  endif
 131
 132 #  ifndef SvGETMAGIC
 133 #    define SvGETMAGIC(x)                  STMT_START { if (SvGMAGICAL(x)) mg_get(x); } STMT_END
 134 #  endif
 135
 136 #endif
 137
 138 #  ifndef SvPVbyte_nolen
 139 #    define SvPVbyte_nolen SvPV_nolen
 140 #  endif
 141
 142 #  ifndef SvPVbyte_force
 143 #    define SvPVbyte_force(sv,lp) SvPV_force(sv,lp)
 144 #  endif
 145
 146 #if PERL_REVISION == 5 && (PERL_VERSION >= 8 || (PERL_VERSION == 8 && PERL_SUBVERSION < 4 ))
 147 #    define UTF8_AVAILABLE
 148 #endif
 149
 150 typedef int                     DualType ;
 151 typedef int                     int_undef ;
 152
 153 typedef struct di_stream {
 154     int      flags ;
 155 #define FLAG_APPEND             1
 156 #define FLAG_CRC32              2
 157 #define FLAG_ADLER32            4
 158 #define FLAG_CONSUME_INPUT      8
 159     uLong    crc32 ;
 160     uLong    adler32 ;
 161     z_stream stream;
 162     uLong     bufsize;
 163     uLong     bufinc;
 164     SV *     dictionary ;
 165     uLong    dict_adler ;
 166     int      last_error ;
 167     bool     zip_mode ;
 168 #define SETP_BYTE
 169 #ifdef SETP_BYTE
 170     bool     deflateParams_out_valid ;
 171     Bytef    deflateParams_out_byte;
 172 #else
 173 #define deflateParams_BUFFER_SIZE       0x4000
 174     uLong    deflateParams_out_length;
 175     Bytef*   deflateParams_out_buffer;
 176 #endif
 177     int      Level;
 178     int      Method;
 179     int      WindowBits;
 180     int      MemLevel;
 181     int      Strategy;
 182     uLong    bytesInflated ;
 183     uLong    compressedBytes ;
 184     uLong    uncompressedBytes ;
 185 #ifdef MAGIC_APPEND
 186
 187 #define WINDOW_SIZE 32768U
 188
 189     bool     matchedEndBlock;
 190     Bytef*   window ;
 191     int      window_lastbit,  window_left,  window_full;
 192     unsigned window_have;
 193     off_t    window_lastoff, window_end;
 194     off_t    window_endOffset;
 195
 196     uLong    lastBlockOffset ;
 197     unsigned char window_lastByte ;
 198
 199
 200 #endif
 201 } di_stream;
 202
 203 typedef di_stream * deflateStream ;
 204 typedef di_stream * Compress__Zlib__deflateStream ;
 205 typedef di_stream * inflateStream ;
 206 typedef di_stream * Compress__Zlib__inflateStream ;
 207 typedef di_stream * Compress__Zlib__inflateScanStream ;
 208
 209 #define GZERRNO "Compress::Zlib::gzerrno"
 210
 211 #define ZMALLOC(to, typ) ((to = (typ *)safemalloc(sizeof(typ))), \
 212                                 Zero(to,1,typ))
 213
 214 /* Figure out the Operating System */
 215 #ifdef MSDOS
 216 #  define OS_CODE  0x00
 217 #endif
 218
 219 #if defined(AMIGA) || defined(AMIGAOS)
 220 #  define OS_CODE  0x01
 221 #endif
 222
 223 #if defined(VAXC) || defined(VMS)
 224 #  define OS_CODE  0x02
 225 #endif
 226
 227 #if 0 /* VM/CMS */
 228 #  define OS_CODE  0x04
 229 #endif
 230
 231 #if defined(ATARI) || defined(atarist)
 232 #  define OS_CODE  0x05
 233 #endif
 234
 235 #ifdef OS2
 236 #  define OS_CODE  0x06
 237 #endif
 238
 239 #if defined(MACOS) || defined(TARGET_OS_MAC)
 240 #  define OS_CODE  0x07
 241 #endif
 242
 243 #if 0 /* Z-System */
 244 #  define OS_CODE  0x08
 245 #endif
 246
 247 #if 0 /* CP/M */
 248 #  define OS_CODE  0x09
 249 #endif
 250
 251 #ifdef TOPS20
 252 #  define OS_CODE  0x0a
 253 #endif
 254
 255 #ifdef WIN32 /* Window 95 & Windows NT */
 256 #  define OS_CODE  0x0b
 257 #endif
 258
 259 #if 0 /* QDOS */
 260 #  define OS_CODE  0x0c
 261 #endif
 262
 263 #if 0 /* Acorn RISCOS */
 264 #  define OS_CODE  0x0d
 265 #endif
 266
 267 #if 0 /* ???  */
 268 #  define OS_CODE  0x0e
 269 #endif
 270
 271 #ifdef __50SERIES /* Prime/PRIMOS */
 272 #  define OS_CODE  0x0F
 273 #endif
 274
 275 /* Default to UNIX */
 276 #ifndef OS_CODE
 277 #  define OS_CODE  0x03  /* assume Unix */
 278 #endif
 279
 280 #ifndef GZIP_OS_CODE
 281 #  define GZIP_OS_CODE OS_CODE
 282 #endif
 283
 284 #define adlerInitial adler32(0L, Z_NULL, 0)
 285 #define crcInitial crc32(0L, Z_NULL, 0)
 286
 287
 288 static const char * const my_z_errmsg[] = {
 289     "need dictionary",     /* Z_NEED_DICT     2 */
 290     "stream end",          /* Z_STREAM_END    1 */
 291     "",                    /* Z_OK            0 */
 292     "file error",          /* Z_ERRNO        (-1) */
 293     "stream error",        /* Z_STREAM_ERROR (-2) */
 294     "data error",          /* Z_DATA_ERROR   (-3) */
 295     "insufficient memory", /* Z_MEM_ERROR    (-4) */
 296     "buffer error",        /* Z_BUF_ERROR    (-5) */
 297     "incompatible version",/* Z_VERSION_ERROR(-6) */
 298     ""};
 299
 300 #define setDUALstatus(var, err)                                         \
 301                 sv_setnv(var, (double)err) ;                            \
 302                 sv_setpv(var, ((err) ? GetErrorString(err) : "")) ;     \
 303                 SvNOK_on(var);
 304
 305
 306 #if defined(__SYMBIAN32__)
 307 # define NO_WRITEABLE_DATA
 308 #endif
 309
 310 #define TRACE_DEFAULT 0
 311
 312 #ifdef NO_WRITEABLE_DATA
 313 #  define trace TRACE_DEFAULT
 314 #else
 315   static int trace = TRACE_DEFAULT ;
 316 #endif
 317
 318 /* Dodge PerlIO hiding of these functions. */
 319 #undef printf
 320
 321 static char *
 322 #ifdef CAN_PROTOTYPE
 323 GetErrorString(int error_no)
 324 #else
 325 GetErrorString(error_no)
 326 int error_no ;
 327 #endif
 328 {
 329     dTHX;
 330     char * errstr ;
 331
 332     if (error_no == Z_ERRNO) {
 333         errstr = Strerror(errno) ;
 334     }
 335     else
 336         /* errstr = gzerror(fil, &error_no) ; */
 337         errstr = (char*) my_z_errmsg[2 - error_no];
 338
 339     return errstr ;
 340 }
 341
 342 #if 0
 343 static void
 344 #ifdef CAN_PROTOTYPE
 345 SetGzErrorNo(int error_no)
 346 #else
 347 SetGzErrorNo(error_no)
 348 int error_no ;
 349 #endif
 350 {
 351     dTHX;
 352     char * errstr ;
 353     SV * gzerror_sv = perl_get_sv(GZERRNO, FALSE) ;
 354
 355     if (error_no == Z_ERRNO) {
 356         error_no = errno ;
 357         errstr = Strerror(errno) ;
 358     }
 359     else
 360         /* errstr = gzerror(fil, &error_no) ; */
 361         errstr = (char*) my_z_errmsg[2 - error_no];
 362
 363     if (SvIV(gzerror_sv) != error_no) {
 364         sv_setiv(gzerror_sv, error_no) ;
 365         sv_setpv(gzerror_sv, errstr) ;
 366         SvIOK_on(gzerror_sv) ;
 367     }
 368
 369 }
 370
 371
 372 static void
 373 #ifdef CAN_PROTOTYPE
 374 SetGzError(gzFile file)
 375 #else
 376 SetGzError(file)
 377 gzFile file ;
 378 #endif
 379 {
 380     int error_no ;
 381
 382     (void)gzerror(file, &error_no) ;
 383     SetGzErrorNo(error_no) ;
 384 }
 385
 386 #endif
 387
 388 #ifdef MAGIC_APPEND
 389
 390 /*
 391    The following two functions are taken almost directly from
 392    examples/gzappend.c. Only cosmetic changes have been made to conform to
 393    the coding style of the rest of the code in this file.
 394 */
 395
 396
 397 /* return the greatest common divisor of a and b using Euclid's algorithm,
 398    modified to be fast when one argument much greater than the other, and
 399    coded to avoid unnecessary swapping */
 400 static unsigned
 401 #ifdef CAN_PROTOTYPE
 402 gcd(unsigned a, unsigned b)
 403 #else
 404 gcd(a, b)
 405     unsigned a;
 406     unsigned b;
 407 #endif
 408 {
 409     unsigned c;
 410
 411     while (a && b)
 412         if (a > b) {
 413             c = b;
 414             while (a - c >= c)
 415                 c <<= 1;
 416             a -= c;
 417         }
 418         else {
 419             c = a;
 420             while (b - c >= c)
 421                 c <<= 1;
 422             b -= c;
 423         }
 424     return a + b;
 425 }
 426
 427 /* rotate list[0..len-1] left by rot positions, in place */
 428 static void
 429 #ifdef CAN_PROTOTYPE
 430 rotate(unsigned char *list, unsigned len, unsigned rot)
 431 #else
 432 rotate(list, len, rot)
 433     unsigned char *list;
 434     unsigned len ;
 435     unsigned rot;
 436 #endif
 437 {
 438     unsigned char tmp;
 439     unsigned cycles;
 440     unsigned char *start, *last, *to, *from;
 441
 442     /* normalize rot and handle degenerate cases */
 443     if (len < 2) return;
 444     if (rot >= len) rot %= len;
 445     if (rot == 0) return;
 446
 447     /* pointer to last entry in list */
 448     last = list + (len - 1);
 449
 450     /* do simple left shift by one */
 451     if (rot == 1) {
 452         tmp = *list;
 453         memcpy(list, list + 1, len - 1);
 454         *last = tmp;
 455         return;
 456     }
 457
 458     /* do simple right shift by one */
 459     if (rot == len - 1) {
 460         tmp = *last;
 461         memmove(list + 1, list, len - 1);
 462         *list = tmp;
 463         return;
 464     }
 465
 466     /* otherwise do rotate as a set of cycles in place */
 467     cycles = gcd(len, rot);             /* number of cycles */
 468     do {
 469         start = from = list + cycles;   /* start index is arbitrary */
 470         tmp = *from;                    /* save entry to be overwritten */
 471         for (;;) {
 472             to = from;                  /* next step in cycle */
 473             from += rot;                /* go right rot positions */
 474             if (from > last) from -= len;   /* (pointer better not wrap) */
 475             if (from == start) break;   /* all but one shifted */
 476             *to = *from;                /* shift left */
 477         }
 478         *to = tmp;                      /* complete the circle */
 479     } while (--cycles);
 480 }
 481
 482 #endif /* MAGIC_APPEND */
 483
 484 static void
 485 #ifdef CAN_PROTOTYPE
 486 DispHex(void * ptr, int length)
 487 #else
 488 DispHex(ptr, length)
 489     void * ptr;
 490     int length;
 491 #endif
 492 {
 493     char * p = (char*)ptr;
 494     int i;
 495     for (i = 0; i < length; ++i) {
 496         printf(" %02x", 0xFF & *(p+i));
 497     }
 498 }
 499
 500
 501 static void
 502 #ifdef CAN_PROTOTYPE
 503 DispStream(di_stream * s, char * message)
 504 #else
 505 DispStream(s, message)
 506     di_stream * s;
 507     char * message;
 508 #endif
 509 {
 510
 511 #if 0
 512     if (! trace)
 513         return ;
 514 #endif
 515
 516 #define EnDis(f) (s->flags & f ? "Enabled" : "Disabled")
 517
 518     printf("DispStream 0x%p", s) ;
 519     if (message)
 520         printf("- %s \n", message) ;
 521     printf("\n") ;
 522
 523     if (!s)  {
 524         printf("    stream pointer is NULL\n");
 525     }
 526     else     {
 527         printf("    stream           0x%p\n", &(s->stream));
 528         printf("           zalloc    0x%p\n", s->stream.zalloc);
 529         printf("           zfree     0x%p\n", s->stream.zfree);
 530         printf("           opaque    0x%p\n", s->stream.opaque);
 531         if (s->stream.msg)
 532             printf("           msg       %s\n", s->stream.msg);
 533         else
 534             printf("           msg       \n");
 535         printf("           next_in   0x%p", s->stream.next_in);
 536         if (s->stream.next_in){
 537             printf(" =>");
 538             DispHex(s->stream.next_in, 4);
 539         }
 540         printf("\n");
 541
 542         printf("           next_out  0x%p", s->stream.next_out);
 543         if (s->stream.next_out){
 544             printf(" =>");
 545             DispHex(s->stream.next_out, 4);
 546         }
 547         printf("\n");
 548
 549         printf("           avail_in  %lu\n",  (unsigned long)s->stream.avail_in);
 550         printf("           avail_out %lu\n",  (unsigned long)s->stream.avail_out);
 551         printf("           total_in  %ld\n",  s->stream.total_in);
 552         printf("           total_out %ld\n",  s->stream.total_out);
 553         printf("           adler     %ld\n",  s->stream.adler    );
 554         printf("    bufsize          %ld\n",  s->bufsize);
 555         printf("    dictionary       0x%p\n", s->dictionary);
 556         printf("    dict_adler       0x%ld\n",s->dict_adler);
 557         printf("    zip_mode         %d\n",   s->zip_mode);
 558         printf("    crc32            0x%x\n", (unsigned)s->crc32);
 559         printf("    adler32          0x%x\n", (unsigned)s->adler32);
 560         printf("    flags            0x%x\n", s->flags);
 561         printf("           APPEND    %s\n",   EnDis(FLAG_APPEND));
 562         printf("           CRC32     %s\n",   EnDis(FLAG_CRC32));
 563         printf("           ADLER32   %s\n",   EnDis(FLAG_ADLER32));
 564         printf("           CONSUME   %s\n",   EnDis(FLAG_CONSUME_INPUT));
 565
 566 #ifdef MAGIC_APPEND
 567         printf("    window           0x%p\n", s->window);
 568 #endif
 569         printf("\n");
 570
 571     }
 572 }
 573
 574 static di_stream *
 575 #ifdef CAN_PROTOTYPE
 576 InitStream(void)
 577 #else
 578 InitStream()
 579 #endif
 580 {
 581     di_stream *s ;
 582
 583     ZMALLOC(s, di_stream) ;
 584
 585     return s ;
 586
 587 }
 588
 589 static void
 590 #ifdef CAN_PROTOTYPE
 591 PostInitStream(di_stream * s, int flags, int bufsize, int windowBits)
 592 #else
 593 PostInitStream(s, flags, bufsize, windowBits)
 594     di_stream *s ;
 595     int flags ;
 596     int bufsize ;
 597     int windowBits ;
 598 #endif
 599 {
 600     s->bufsize = bufsize ;
 601     s->bufinc  = bufsize ;
 602     s->compressedBytes =
 603     s->uncompressedBytes =
 604     s->last_error = 0 ;
 605     s->flags    = flags ;
 606     s->zip_mode = (windowBits < 0) ;
 607     if (flags & FLAG_CRC32)
 608         s->crc32 = crcInitial ;
 609     if (flags & FLAG_ADLER32)
 610         s->adler32 = adlerInitial ;
 611 }
 612
 613
 614 static SV*
 615 #ifdef CAN_PROTOTYPE
 616 deRef(SV * sv, char * string)
 617 #else
 618 deRef(sv, string)
 619 SV * sv ;
 620 char * string;
 621 #endif
 622 {
 623     dTHX;
 624     SvGETMAGIC(sv);
 625
 626     if (SvROK(sv)) {
 627         sv = SvRV(sv) ;
 628         SvGETMAGIC(sv);
 629         switch(SvTYPE(sv)) {
 630             case SVt_PVAV:
 631             case SVt_PVHV:
 632             case SVt_PVCV:
 633                 croak("%s: buffer parameter is not a SCALAR reference", string);
 634         }
 635         if (SvROK(sv))
 636             croak("%s: buffer parameter is a reference to a reference", string) ;
 637     }
 638
 639     if (!SvOK(sv)) {
 640         sv = newSVpv("", 0);
 641     }
 642
 643     return sv ;
 644 }
 645
 646 static SV*
 647 #ifdef CAN_PROTOTYPE
 648 deRef_l(SV * sv, char * string)
 649 #else
 650 deRef_l(sv, string)
 651 SV * sv ;
 652 char * string ;
 653 #endif
 654 {
 655     dTHX;
 656     bool wipe = 0 ;
 657
 658     SvGETMAGIC(sv);
 659     wipe = ! SvOK(sv) ;
 660
 661     if (SvROK(sv)) {
 662         sv = SvRV(sv) ;
 663         SvGETMAGIC(sv);
 664         wipe = ! SvOK(sv) ;
 665
 666         switch(SvTYPE(sv)) {
 667             case SVt_PVAV:
 668             case SVt_PVHV:
 669             case SVt_PVCV:
 670                 croak("%s: buffer parameter is not a SCALAR reference", string);
 671         }
 672         if (SvROK(sv))
 673             croak("%s: buffer parameter is a reference to a reference", string) ;
 674     }
 675
 676     if (SvREADONLY(sv) && PL_curcop != &PL_compiling)
 677         croak("%s: buffer parameter is read-only", string);
 678
 679     SvUPGRADE(sv, SVt_PV);
 680
 681     if (wipe)
 682         SvCUR_set(sv, 0);
 683
 684     SvOOK_off(sv);
 685     SvPOK_only(sv);
 686
 687     return sv ;
 688 }
 689
 690
 691 #include "constants.h"
 692
 693 MODULE = Compress::Zlib PACKAGE = Compress::Zlib        PREFIX = Zip_
 694
 695 REQUIRE:        1.924
 696 PROTOTYPES:     DISABLE
 697
 698 INCLUDE: constants.xs
 699
 700 BOOT:
 701     /* Check this version of zlib is == 1 */
 702     if (zlibVersion()[0] != '1')
 703         croak("Compress::Zlib needs zlib version 1.x\n") ;
 704
 705     {
 706         /* Create the $os_code scalar */
 707         SV * os_code_sv = perl_get_sv("Compress::Zlib::gzip_os_code", GV_ADDMULTI) ;
 708         sv_setiv(os_code_sv, GZIP_OS_CODE) ;
 709     }
 710
 711     {
 712         /* Create the $gzerror scalar */
 713         SV * gzerror_sv = perl_get_sv(GZERRNO, GV_ADDMULTI) ;
 714         sv_setiv(gzerror_sv, 0) ;
 715         sv_setpv(gzerror_sv, "") ;
 716         SvIOK_on(gzerror_sv) ;
 717     }
 718
 719 #define Zip_zlib_version()      (char*)zlib_version
 720 char*
 721 Zip_zlib_version()
 722
 723 unsigned
 724 ZLIB_VERNUM()
 725     CODE:
 726 #ifdef ZLIB_VERNUM
 727         RETVAL = ZLIB_VERNUM ;
 728 #else
 729         /* 1.1.4 => 0x1140 */
 730         RETVAL  = (ZLIB_VERSION[0] - '0') << 12 ;
 731         RETVAL += (ZLIB_VERSION[2] - '0') <<  8 ;
 732         RETVAL += (ZLIB_VERSION[4] - '0') <<  4 ;
 733 #endif
 734     OUTPUT:
 735         RETVAL
 736
 737 MODULE = Compress::Zlib PACKAGE = Compress::Zlib        PREFIX = Zip_
 738
 739 #define Zip_adler32(buf, adler) adler32(adler, buf, (uInt)len)
 740
 741 uLong
 742 Zip_adler32(buf, adler=adlerInitial)
 743         uLong    adler = NO_INIT
 744         STRLEN   len = NO_INIT
 745         Bytef *  buf = NO_INIT
 746         SV *     sv = ST(0) ;
 747         INIT:
 748         /* If the buffer is a reference, dereference it */
 749         sv = deRef(sv, "adler32") ;
 750 #ifdef UTF8_AVAILABLE
 751     if (DO_UTF8(sv) && !sv_utf8_downgrade(sv, 1))
 752          croak("Wide character in Compress::Zlib::adler32");
 753 #endif
 754         buf = (Byte*)SvPVbyte(sv, len) ;
 755
 756         if (items < 2)
 757           adler = adlerInitial;
 758         else if (SvOK(ST(1)))
 759           adler = SvUV(ST(1)) ;
 760         else
 761           adler = adlerInitial;
 762
 763 #define Zip_crc32(buf, crc) crc32(crc, buf, (uInt)len)
 764
 765 uLong
 766 Zip_crc32(buf, crc=crcInitial)
 767         uLong    crc = NO_INIT
 768         STRLEN   len = NO_INIT
 769         Bytef *  buf = NO_INIT
 770         SV *     sv = ST(0) ;
 771         INIT:
 772         /* If the buffer is a reference, dereference it */
 773         sv = deRef(sv, "crc32") ;
 774 #ifdef UTF8_AVAILABLE
 775     if (DO_UTF8(sv) && !sv_utf8_downgrade(sv, 1))
 776          croak("Wide character in Compress::Zlib::crc32");
 777 #endif
 778         buf = (Byte*)SvPVbyte(sv, len) ;
 779
 780         if (items < 2)
 781           crc = crcInitial;
 782         else if (SvOK(ST(1)))
 783           crc = SvUV(ST(1)) ;
 784         else
 785           crc = crcInitial;
 786
 787
 788 uLong
 789 crc32_combine(crc1, crc2, len2)
 790         uLong    crc1
 791         uLong    crc2
 792         z_off_t   len2
 793         CODE:
 794 #ifndef AT_LEAST_ZLIB_1_2_2_1
 795         crc1 = crc1; crc2 = crc2 ; len2 = len2; /* Silence -Wall */
 796         croak("crc32_combine needs zlib 1.2.3 or better");
 797 #else
 798         RETVAL = crc32_combine(crc1, crc2, len2);
 799 #endif
 800     OUTPUT:
 801         RETVAL
 802
 803
 804 uLong
 805 adler32_combine(adler1, adler2, len2)
 806         uLong    adler1
 807         uLong    adler2
 808         z_off_t   len2
 809         CODE:
 810 #ifndef AT_LEAST_ZLIB_1_2_2_1
 811         adler1 = adler1; adler2 = adler2 ; len2 = len2; /* Silence -Wall */
 812         croak("adler32_combine needs zlib 1.2.3 or better");
 813 #else
 814         RETVAL = adler32_combine(adler1, adler2, len2);
 815 #endif
 816     OUTPUT:
 817         RETVAL
 818
 819
 820 MODULE = Compress::Zlib PACKAGE = Compress::Zlib
 821
 822 void
 823 _deflateInit(flags,level, method, windowBits, memLevel, strategy, bufsize, dictionary)
 824     int flags
 825     int level
 826     int method
 827     int windowBits
 828     int memLevel
 829     int strategy
 830     uLong bufsize
 831     SV* dictionary
 832   PPCODE:
 833     int err ;
 834     deflateStream s ;
 835
 836     if (trace)
 837         warn("in _deflateInit(level=%d, method=%d, windowBits=%d, memLevel=%d, strategy=%d, bufsize=%ld\n",
 838         level, method, windowBits, memLevel, strategy, bufsize) ;
 839     if ((s = InitStream() )) {
 840
 841         s->Level      = level;
 842         s->Method     = method;
 843         s->WindowBits = windowBits;
 844         s->MemLevel   = memLevel;
 845         s->Strategy   = strategy;
 846
 847         err = deflateInit2(&(s->stream), level,
 848                            method, windowBits, memLevel, strategy);
 849
 850         /* Check if a dictionary has been specified */
 851
 852         if (err == Z_OK && SvCUR(dictionary)) {
 853 #ifdef UTF8_AVAILABLE
 854         if (DO_UTF8(dictionary) && !sv_utf8_downgrade(dictionary, 1))
 855              croak("Wide character in Compress::Zlib::Deflate::new dicrionary parameter");
 856 #endif
 857             err = deflateSetDictionary(&(s->stream), (const Bytef*) SvPVbyte_nolen(dictionary),
 858                                         SvCUR(dictionary)) ;
 859             s->dict_adler = s->stream.adler ;
 860         }
 861
 862         if (err != Z_OK) {
 863             Safefree(s) ;
 864             s = NULL ;
 865         }
 866         else
 867             PostInitStream(s, flags, bufsize, windowBits) ;
 868
 869     }
 870     else
 871         err = Z_MEM_ERROR ;
 872
 873     XPUSHs(sv_setref_pv(sv_newmortal(),
 874         "Compress::Zlib::deflateStream", (void*)s));
 875     if (GIMME == G_ARRAY) {
 876         SV * sv = sv_2mortal(newSViv(err)) ;
 877         setDUALstatus(sv, err);
 878         XPUSHs(sv) ;
 879     }
 880
 881 void
 882 _inflateInit(flags, windowBits, bufsize, dictionary)
 883     int flags
 884     int windowBits
 885     uLong bufsize
 886     SV * dictionary
 887   ALIAS:
 888     _inflateScanInit = 1
 889   PPCODE:
 890
 891     int err = Z_OK ;
 892     inflateStream s ;
 893 #ifndef MAGIC_APPEND
 894     if (ix == 1)
 895         croak("inflateScanInit needs zlib 1.2.1 or better");
 896 #endif
 897     if (trace)
 898         warn("in _inflateInit(windowBits=%d, bufsize=%lu, dictionary=%lu\n",
 899                 windowBits, bufsize, (unsigned long)SvCUR(dictionary)) ;
 900     if ((s = InitStream() )) {
 901
 902         s->WindowBits = windowBits;
 903
 904         err = inflateInit2(&(s->stream), windowBits);
 905         if (err != Z_OK) {
 906             Safefree(s) ;
 907             s = NULL ;
 908         }
 909         else if (SvCUR(dictionary)) {
 910             /* Dictionary specified - take a copy for use in inflate */
 911             s->dictionary = newSVsv(dictionary) ;
 912         }
 913         if (s) {
 914             PostInitStream(s, flags, bufsize, windowBits) ;
 915 #ifdef MAGIC_APPEND
 916             if (ix == 1)
 917             {
 918                 s->window = (unsigned char *)safemalloc(WINDOW_SIZE);
 919             }
 920 #endif
 921         }
 922     }
 923     else
 924         err = Z_MEM_ERROR ;
 925
 926     XPUSHs(sv_setref_pv(sv_newmortal(),
 927                    ix == 1
 928                    ? "Compress::Zlib::inflateScanStream"
 929                    :  "Compress::Zlib::inflateStream",
 930                    (void*)s));
 931     if (GIMME == G_ARRAY) {
 932         SV * sv = sv_2mortal(newSViv(err)) ;
 933         setDUALstatus(sv, err);
 934         XPUSHs(sv) ;
 935     }
 936
 937
 938
 939 MODULE = Compress::Zlib PACKAGE = Compress::Zlib::deflateStream
 940
 941 void
 942 DispStream(s, message=NULL)
 943     Compress::Zlib::deflateStream   s
 944     char *  message
 945
 946 DualType
 947 deflateReset(s)
 948     Compress::Zlib::deflateStream   s
 949   CODE:
 950       RETVAL = deflateReset(&(s->stream)) ;
 951       if (RETVAL == Z_OK) {
 952           PostInitStream(s, s->flags, s->bufsize, s->WindowBits) ;
 953       }
 954     OUTPUT:
 955       RETVAL
 956
 957 DualType
 958 deflate (s, buf, output)
 959     Compress::Zlib::deflateStream       s
 960     SV *        buf
 961     SV *        output
 962     uInt        cur_length = NO_INIT
 963     uInt        increment = NO_INIT
 964     uInt        prefix    = NO_INIT
 965     int         RETVAL = 0;
 966   CODE:
 967
 968     /* If the input buffer is a reference, dereference it */
 969     buf = deRef(buf, "deflate") ;
 970
 971     /* initialise the input buffer */
 972 #ifdef UTF8_AVAILABLE
 973     if (DO_UTF8(buf) && !sv_utf8_downgrade(buf, 1))
 974          croak("Wide character in Compress::Zlib::Deflate::deflate input parameter");
 975 #endif
 976     s->stream.next_in = (Bytef*)SvPVbyte_nolen(buf) ;
 977     s->stream.avail_in = SvCUR(buf) ;
 978
 979     if (s->flags & FLAG_CRC32)
 980         s->crc32 = crc32(s->crc32, s->stream.next_in, s->stream.avail_in) ;
 981
 982     if (s->flags & FLAG_ADLER32)
 983         s->adler32 = adler32(s->adler32, s->stream.next_in, s->stream.avail_in) ;
 984
 985     /* and retrieve the output buffer */
 986     output = deRef_l(output, "deflate") ;
 987 #ifdef UTF8_AVAILABLE
 988     if (DO_UTF8(output) && !sv_utf8_downgrade(output, 1))
 989          croak("Wide character in Compress::Zlib::Deflate::deflate output parameter");
 990 #endif
 991
 992     if((s->flags & FLAG_APPEND) != FLAG_APPEND) {
 993         SvCUR_set(output, 0);
 994         /* sv_setpvn(output, "", 0); */
 995     }
 996     prefix = cur_length =  SvCUR(output) ;
 997     s->stream.next_out = (Bytef*) SvPVbyte_nolen(output) + cur_length;
 998     increment =  SvLEN(output) -  cur_length;
 999     s->stream.avail_out =  increment;
1000 #ifdef SETP_BYTE
1001     /* Check for saved output from deflateParams */
1002     if (s->deflateParams_out_valid) {
1003         *(s->stream.next_out) = s->deflateParams_out_byte;
1004         ++ s->stream.next_out;
1005         -- s->stream.avail_out ;
1006         s->deflateParams_out_valid = FALSE;
1007     }
1008 #else
1009     /* Check for saved output from deflateParams */
1010     if (s->deflateParams_out_length) {
1011         uLong plen = s->deflateParams_out_length ;
1012         /* printf("Copy %d bytes saved data\n", plen);*/
1013         if (s->stream.avail_out < plen) {
1014             /*printf("GROW from %d to %d\n", s->stream.avail_out,
1015                         SvLEN(output) + plen - s->stream.avail_out); */
1016             Sv_Grow(output, SvLEN(output) + plen - s->stream.avail_out) ;
1017         }
1018
1019         Copy(s->stream.next_out, s->deflateParams_out_buffer, plen, Bytef) ;
1020         cur_length = cur_length + plen;
1021         SvCUR_set(output, cur_length);
1022         s->stream.next_out += plen ;
1023         s->stream.avail_out = SvLEN(output) - cur_length ;
1024         increment = s->stream.avail_out;
1025         s->deflateParams_out_length = 0;
1026     }
1027 #endif
1028     while (s->stream.avail_in != 0) {
1029
1030         if (s->stream.avail_out == 0) {
1031             /* out of space in the output buffer so make it bigger */
1032             Sv_Grow(output, SvLEN(output) + s->bufinc) ;
1033             cur_length += increment ;
1034             s->stream.next_out = (Bytef*) SvPVbyte_nolen(output) + cur_length ;
1035             increment = s->bufinc ;
1036             s->stream.avail_out = increment;
1037             s->bufinc *= 2 ;
1038         }
1039
1040         RETVAL = deflate(&(s->stream), Z_NO_FLUSH);
1041         if (RETVAL != Z_OK)
1042             break;
1043     }
1044
1045     s->compressedBytes += cur_length + increment - prefix - s->stream.avail_out ;
1046     s->uncompressedBytes  += SvCUR(buf) - s->stream.avail_in  ;
1047
1048     s->last_error = RETVAL ;
1049     if (RETVAL == Z_OK) {
1050         SvPOK_only(output);
1051         SvCUR_set(output, cur_length + increment - s->stream.avail_out) ;
1052     }
1053     OUTPUT:
1054         RETVAL
1055         output
1056
1057
1058 void
1059 DESTROY(s)
1060     Compress::Zlib::deflateStream       s
1061   CODE:
1062     deflateEnd(&s->stream) ;
1063     if (s->dictionary)
1064         SvREFCNT_dec(s->dictionary) ;
1065 #ifndef SETP_BYTE
1066     if (s->deflateParams_out_buffer)
1067         Safefree(s->deflateParams_out_buffer);
1068 #endif
1069     Safefree(s) ;
1070
1071
1072 DualType
1073 flush(s, output, f=Z_FINISH)
1074     Compress::Zlib::deflateStream       s
1075     SV * output
1076     int  f
1077     uInt        cur_length = NO_INIT
1078     uInt        increment = NO_INIT
1079     uInt        prefix    = NO_INIT
1080   CODE:
1081
1082     s->stream.avail_in = 0; /* should be zero already anyway */
1083
1084     /* retrieve the output buffer */
1085     output = deRef_l(output, "flush") ;
1086 #ifdef UTF8_AVAILABLE
1087     if (DO_UTF8(output) && !sv_utf8_downgrade(output, 1))
1088          croak("Wide character in Compress::Zlib::Deflate::flush input parameter");
1089 #endif
1090     if(! s->flags & FLAG_APPEND) {
1091         SvCUR_set(output, 0);
1092         /* sv_setpvn(output, "", 0); */
1093     }
1094     prefix = cur_length =  SvCUR(output) ;
1095     s->stream.next_out = (Bytef*) SvPVbyte_nolen(output) + cur_length;
1096     increment =  SvLEN(output) -  cur_length;
1097     s->stream.avail_out =  increment;
1098 #ifdef SETP_BYTE
1099     /* Check for saved output from deflateParams */
1100     if (s->deflateParams_out_valid) {
1101         *(s->stream.next_out) = s->deflateParams_out_byte;
1102         ++ s->stream.next_out;
1103         -- s->stream.avail_out ;
1104         s->deflateParams_out_valid = FALSE;
1105     }
1106 #else
1107     /* Check for saved output from deflateParams */
1108     if (s->deflateParams_out_length) {
1109         uLong plen = s->deflateParams_out_length ;
1110         /* printf("Copy %d bytes saved data\n", plen); */
1111         if (s->stream.avail_out < plen) {
1112             /* printf("GROW from %d to %d\n", s->stream.avail_out,
1113                         SvLEN(output) + plen - s->stream.avail_out); */
1114             Sv_Grow(output, SvLEN(output) + plen - s->stream.avail_out) ;
1115         }
1116
1117         Copy(s->stream.next_out, s->deflateParams_out_buffer, plen, Bytef) ;
1118         cur_length = cur_length + plen;
1119         SvCUR_set(output, cur_length);
1120         s->stream.next_out += plen ;
1121         s->stream.avail_out = SvLEN(output) - cur_length ;
1122         increment = s->stream.avail_out;
1123         s->deflateParams_out_length = 0;
1124     }
1125 #endif
1126
1127     for (;;) {
1128         if (s->stream.avail_out == 0) {
1129             /* consumed all the available output, so extend it */
1130             Sv_Grow(output, SvLEN(output) + s->bufinc) ;
1131             cur_length += increment ;
1132             s->stream.next_out = (Bytef*) SvPVbyte_nolen(output) + cur_length ;
1133             increment = s->bufinc ;
1134             s->stream.avail_out = increment;
1135             s->bufinc *= 2 ;
1136         }
1137         RETVAL = deflate(&(s->stream), f);
1138
1139         /* deflate has finished flushing only when it hasn't used up
1140          * all the available space in the output buffer:
1141          */
1142         if (s->stream.avail_out != 0 || RETVAL != Z_OK )
1143             break;
1144     }
1145
1146     RETVAL =  (RETVAL == Z_STREAM_END ? Z_OK : RETVAL) ;
1147     s->last_error = RETVAL ;
1148
1149     s->compressedBytes    += cur_length + increment - prefix - s->stream.avail_out ;
1150
1151     if (RETVAL == Z_OK) {
1152         SvPOK_only(output);
1153         SvCUR_set(output, cur_length + increment - s->stream.avail_out) ;
1154     }
1155     OUTPUT:
1156         RETVAL
1157         output
1158
1159
1160 DualType
1161 _deflateParams(s, flags, level, strategy, bufsize)
1162         Compress::Zlib::deflateStream   s
1163         int     flags
1164         int     level
1165         int     strategy
1166         uLong   bufsize
1167     CODE:
1168         /* printf("_deflateParams(Flags %d Level %d Strategy %d Bufsize %d)\n", flags, level, strategy, bufsize);
1169         printf("Before -- Level %d, Strategy %d, Bufsize %d\n", s->Level, s->Strategy, s->bufsize); */
1170         if (flags & 1)
1171             s->Level = level ;
1172         if (flags & 2)
1173             s->Strategy = strategy ;
1174         if (flags & 4) {
1175             s->bufsize = bufsize;
1176             s->bufinc  = bufsize;
1177         }
1178         /* printf("After --  Level %d, Strategy %d, Bufsize %d\n", s->Level, s->Strategy, s->bufsize);*/
1179 #ifdef SETP_BYTE
1180         s->stream.avail_in = 0;
1181         s->stream.next_out = &(s->deflateParams_out_byte) ;
1182         s->stream.avail_out = 1;
1183         RETVAL = deflateParams(&(s->stream), s->Level, s->Strategy);
1184         s->deflateParams_out_valid =
1185                 (RETVAL == Z_OK && s->stream.avail_out == 0) ;
1186         /* printf("RETVAL %d, avail out %d, byte %c\n", RETVAL, s->stream.avail_out, s->deflateParams_out_byte); */
1187 #else
1188         /* printf("Level %d Strategy %d, Prev Len %d\n",
1189                 s->Level, s->Strategy, s->deflateParams_out_length); */
1190         s->stream.avail_in = 0;
1191         if (s->deflateParams_out_buffer == NULL)
1192             s->deflateParams_out_buffer = safemalloc(deflateParams_BUFFER_SIZE);
1193         s->stream.next_out = s->deflateParams_out_buffer ;
1194         s->stream.avail_out = deflateParams_BUFFER_SIZE;
1195
1196         RETVAL = deflateParams(&(s->stream), s->Level, s->Strategy);
1197         s->deflateParams_out_length = deflateParams_BUFFER_SIZE - s->stream.avail_out;
1198         /* printf("RETVAL %d, length out %d, avail %d\n",
1199                     RETVAL, s->deflateParams_out_length, s->stream.avail_out ); */
1200 #endif
1201     OUTPUT:
1202         RETVAL
1203
1204
1205 int
1206 get_Level(s)
1207         Compress::Zlib::deflateStream   s
1208     CODE:
1209         RETVAL = s->Level ;
1210     OUTPUT:
1211         RETVAL
1212
1213 int
1214 get_Strategy(s)
1215         Compress::Zlib::deflateStream   s
1216     CODE:
1217         RETVAL = s->Strategy ;
1218     OUTPUT:
1219         RETVAL
1220
1221
1222 uLong
1223 get_Bufsize(s)
1224         Compress::Zlib::deflateStream   s
1225     CODE:
1226         RETVAL = s->bufsize ;
1227     OUTPUT:
1228         RETVAL
1229
1230
1231 int
1232 status(s)
1233         Compress::Zlib::deflateStream   s
1234     CODE:
1235         RETVAL = s->last_error ;
1236     OUTPUT:
1237         RETVAL
1238
1239 uLong
1240 crc32(s)
1241         Compress::Zlib::deflateStream   s
1242     CODE:
1243         RETVAL = s->crc32 ;
1244     OUTPUT:
1245         RETVAL
1246
1247 uLong
1248 dict_adler(s)
1249         Compress::Zlib::deflateStream   s
1250     CODE:
1251         RETVAL = s->dict_adler ;
1252     OUTPUT:
1253         RETVAL
1254
1255 uLong
1256 adler32(s)
1257         Compress::Zlib::deflateStream   s
1258     CODE:
1259         RETVAL = s->adler32 ;
1260     OUTPUT:
1261         RETVAL
1262
1263 uLong
1264 compressedBytes(s)
1265     Compress::Zlib::deflateStream       s
1266     CODE:
1267         RETVAL = s->compressedBytes;
1268   OUTPUT:
1269         RETVAL
1270
1271 uLong
1272 uncompressedBytes(s)
1273     Compress::Zlib::deflateStream       s
1274     CODE:
1275         RETVAL = s->uncompressedBytes;
1276   OUTPUT:
1277         RETVAL
1278
1279 uLong
1280 total_in(s)
1281         Compress::Zlib::deflateStream   s
1282     CODE:
1283         RETVAL = s->stream.total_in ;
1284     OUTPUT:
1285         RETVAL
1286
1287 uLong
1288 total_out(s)
1289         Compress::Zlib::deflateStream   s
1290     CODE:
1291         RETVAL = s->stream.total_out ;
1292     OUTPUT:
1293         RETVAL
1294
1295 char*
1296 msg(s)
1297         Compress::Zlib::deflateStream   s
1298     CODE:
1299         RETVAL = s->stream.msg;
1300     OUTPUT:
1301         RETVAL
1302
1303 int
1304 deflateTune(s, good_length, max_lazy, nice_length, max_chain)
1305             Compress::Zlib::deflateStream   s
1306             int good_length
1307             int max_lazy
1308             int nice_length
1309             int max_chain
1310     CODE:
1311 #ifndef AT_LEAST_ZLIB_1_2_2_3
1312         good_length = good_length; max_lazy = max_lazy ; /* Silence -Wall */
1313         nice_length = nice_length; max_chain = max_chain; /* Silence -Wall */
1314         croak("deflateTune needs zlib 1.2.2.3 or better");
1315 #else
1316         RETVAL = deflateTune(&(s->stream), good_length, max_lazy, nice_length, max_chain);
1317 #endif
1318     OUTPUT:
1319         RETVAL
1320
1321
1322 MODULE = Compress::Zlib PACKAGE = Compress::Zlib::inflateStream
1323
1324 void
1325 DispStream(s, message=NULL)
1326     Compress::Zlib::inflateStream   s
1327     char *  message
1328
1329 DualType
1330 inflateReset(s)
1331     Compress::Zlib::inflateStream   s
1332   CODE:
1333       RETVAL = inflateReset(&(s->stream)) ;
1334       if (RETVAL == Z_OK) {
1335           PostInitStream(s, s->flags, s->bufsize, s->WindowBits) ;
1336       }
1337     OUTPUT:
1338       RETVAL
1339
1340 DualType
1341 inflate (s, buf, output, eof=FALSE)
1342     Compress::Zlib::inflateStream       s
1343     SV *        buf
1344     SV *        output
1345     bool        eof
1346     uInt        cur_length = 0;
1347     uInt        prefix_length = 0;
1348     uInt        increment = 0;
1349     STRLEN  stmp    = NO_INIT
1350   PREINIT:
1351 #ifdef UTF8_AVAILABLE
1352     bool        out_utf8  = FALSE;
1353 #endif
1354   CODE:
1355     /* If the buffer is a reference, dereference it */
1356     buf = deRef(buf, "inflate") ;
1357
1358     if (s->flags & FLAG_CONSUME_INPUT && SvREADONLY(buf))
1359         croak("Compress::Zlib::Inflate::inflate input parameter cannot be read-only when ConsumeInput is specified");
1360 #ifdef UTF8_AVAILABLE
1361     if (DO_UTF8(buf) && !sv_utf8_downgrade(buf, 1))
1362          croak("Wide character in Compress::Zlib::Inflate::inflate input parameter");
1363 #endif
1364
1365     /* initialise the input buffer */
1366     s->stream.next_in = (Bytef*)SvPVbyte_force(buf, stmp) ;
1367     s->stream.avail_in = SvCUR(buf) ;
1368
1369     /* and retrieve the output buffer */
1370     output = deRef_l(output, "inflate") ;
1371 #ifdef UTF8_AVAILABLE
1372     if (DO_UTF8(output))
1373          out_utf8 = TRUE ;
1374     if (DO_UTF8(output) && !sv_utf8_downgrade(output, 1))
1375          croak("Wide character in Compress::Zlib::Inflate::inflate output parameter");
1376 #endif
1377     if((s->flags & FLAG_APPEND) != FLAG_APPEND) {
1378         SvCUR_set(output, 0);
1379     }
1380     if (SvLEN(output)) {
1381         prefix_length = cur_length =  SvCUR(output) ;
1382         s->stream.next_out = (Bytef*) SvPVbyte_nolen(output) + cur_length;
1383         increment = SvLEN(output) -  cur_length - 1;
1384         s->stream.avail_out = increment;
1385     }
1386     else {
1387         s->stream.avail_out = 0;
1388     }
1389     s->bytesInflated = 0;
1390
1391     while (1) {
1392
1393         if (s->stream.avail_out == 0) {
1394             /* out of space in the output buffer so make it bigger */
1395             Sv_Grow(output, SvLEN(output) + s->bufinc) ;
1396             cur_length += increment ;
1397             s->stream.next_out = (Bytef*) SvPVbyte_nolen(output) + cur_length ;
1398             increment = s->bufinc ;
1399             s->stream.avail_out = increment;
1400             s->bufinc *= 2 ;
1401         }
1402
1403         RETVAL = inflate(&(s->stream), Z_SYNC_FLUSH);
1404
1405         if (RETVAL == Z_STREAM_ERROR || RETVAL == Z_MEM_ERROR ||
1406             RETVAL == Z_DATA_ERROR  || RETVAL == Z_STREAM_END )
1407             break ;
1408
1409         if (RETVAL == Z_BUF_ERROR) {
1410             if (s->stream.avail_out == 0)
1411                 continue ;
1412             if (s->stream.avail_in == 0) {
1413                 RETVAL = Z_OK ;
1414                 break ;
1415             }
1416         }
1417
1418         if (RETVAL == Z_NEED_DICT && s->dictionary) {
1419             s->dict_adler = s->stream.adler ;
1420             RETVAL = inflateSetDictionary(&(s->stream),
1421             (const Bytef*)SvPVbyte_nolen(s->dictionary),
1422             SvCUR(s->dictionary));
1423         }
1424
1425         if (RETVAL != Z_OK)
1426             break;
1427     }
1428 #ifdef NEED_DUMMY_BYTE_AT_END
1429     if (eof && RETVAL == Z_OK) {
1430         Bytef* nextIn =  s->stream.next_in;
1431         uInt availIn =  s->stream.avail_in;
1432         s->stream.next_in = (Bytef*) " ";
1433         s->stream.avail_in = 1;
1434         if (s->stream.avail_out == 0) {
1435             /* out of space in the output buffer so make it bigger */
1436             Sv_Grow(output, SvLEN(output) + s->bufinc) ;
1437             cur_length += increment ;
1438             s->stream.next_out = (Bytef*) SvPVbyte_nolen(output) + cur_length ;
1439             increment = s->bufinc ;
1440             s->stream.avail_out = increment;
1441             s->bufinc *= 2 ;
1442         }
1443         RETVAL = inflate(&(s->stream), Z_SYNC_FLUSH);
1444         s->stream.next_in = nextIn ;
1445         s->stream.avail_in  = availIn ;
1446     }
1447 #endif
1448
1449     s->last_error = RETVAL ;
1450     if (RETVAL == Z_OK || RETVAL == Z_STREAM_END || RETVAL == Z_DATA_ERROR) {
1451         unsigned in ;
1452
1453         s->bytesInflated = cur_length + increment - s->stream.avail_out - prefix_length;
1454         s->uncompressedBytes += s->bytesInflated ;
1455         s->compressedBytes   += SvCUR(buf) - s->stream.avail_in  ;
1456
1457         SvPOK_only(output);
1458         SvCUR_set(output, prefix_length + s->bytesInflated) ;
1459         *SvEND(output) = '\0';
1460 #ifdef UTF8_AVAILABLE
1461         if (out_utf8)
1462             sv_utf8_upgrade(output);
1463 #endif
1464
1465         if (s->flags & FLAG_CRC32 )
1466             s->crc32 = crc32(s->crc32,
1467                                 (const Bytef*)SvPVbyte_nolen(output)+prefix_length,
1468                                 SvCUR(output)-prefix_length) ;
1469
1470         if (s->flags & FLAG_ADLER32)
1471             s->adler32 = adler32(s->adler32,
1472                                 (const Bytef*)SvPVbyte_nolen(output)+prefix_length,
1473                                 SvCUR(output)-prefix_length) ;
1474
1475         /* fix the input buffer */
1476         if (s->flags & FLAG_CONSUME_INPUT) {
1477             in = s->stream.avail_in ;
1478             SvCUR_set(buf, in) ;
1479             if (in)
1480                 Move(s->stream.next_in, SvPVbyte_nolen(buf), in, char) ;
1481             *SvEND(buf) = '\0';
1482             SvSETMAGIC(buf);
1483         }
1484     }
1485     OUTPUT:
1486         RETVAL
1487         buf
1488         output
1489
1490 uLong
1491 inflateCount(s)
1492     Compress::Zlib::inflateStream       s
1493     CODE:
1494         RETVAL = s->bytesInflated;
1495   OUTPUT:
1496         RETVAL
1497
1498 uLong
1499 compressedBytes(s)
1500     Compress::Zlib::inflateStream       s
1501     CODE:
1502         RETVAL = s->compressedBytes;
1503   OUTPUT:
1504         RETVAL
1505
1506 uLong
1507 uncompressedBytes(s)
1508     Compress::Zlib::inflateStream       s
1509     CODE:
1510         RETVAL = s->uncompressedBytes;
1511   OUTPUT:
1512         RETVAL
1513
1514
1515 DualType
1516 inflateSync (s, buf)
1517     Compress::Zlib::inflateStream       s
1518     SV *        buf
1519   CODE:
1520
1521     /* If the buffer is a reference, dereference it */
1522     buf = deRef(buf, "inflateSync") ;
1523 #ifdef UTF8_AVAILABLE
1524     if (DO_UTF8(buf) && !sv_utf8_downgrade(buf, 1))
1525          croak("Wide character in Compress::Zlib::Inflate::inflateSync");
1526 #endif
1527
1528     /* initialise the input buffer */
1529     s->stream.next_in = (Bytef*)SvPVbyte_nolen(buf) ;
1530     s->stream.avail_in = SvCUR(buf) ;
1531
1532     /* inflateSync doesn't create any output */
1533     s->stream.next_out = (Bytef*) NULL;
1534     s->stream.avail_out = 0;
1535
1536     RETVAL = inflateSync(&(s->stream));
1537     s->last_error = RETVAL ;
1538
1539     /* fix the input buffer */
1540     {
1541         unsigned in = s->stream.avail_in ;
1542         SvCUR_set(buf, in) ;
1543         if (in)
1544             Move(s->stream.next_in, SvPVbyte_nolen(buf), in, char) ;
1545         *SvEND(buf) = '\0';
1546         SvSETMAGIC(buf);
1547     }
1548     OUTPUT:
1549         RETVAL
1550         buf
1551
1552 void
1553 DESTROY(s)
1554     Compress::Zlib::inflateStream       s
1555   CODE:
1556     inflateEnd(&s->stream) ;
1557     if (s->dictionary)
1558         SvREFCNT_dec(s->dictionary) ;
1559 #ifndef SETP_BYTE
1560     if (s->deflateParams_out_buffer)
1561         Safefree(s->deflateParams_out_buffer);
1562 #endif
1563 #ifdef MAGIC_APPEND
1564     if (s->window)
1565         Safefree(s->window);
1566 #endif
1567     Safefree(s) ;
1568
1569
1570 uLong
1571 status(s)
1572         Compress::Zlib::inflateStream   s
1573     CODE:
1574         RETVAL = s->last_error ;
1575     OUTPUT:
1576         RETVAL
1577
1578 uLong
1579 crc32(s)
1580         Compress::Zlib::inflateStream   s
1581     CODE:
1582         RETVAL = s->crc32 ;
1583     OUTPUT:
1584         RETVAL
1585
1586 uLong
1587 dict_adler(s)
1588         Compress::Zlib::inflateStream   s
1589     CODE:
1590         RETVAL = s->dict_adler ;
1591     OUTPUT:
1592         RETVAL
1593
1594 uLong
1595 total_in(s)
1596         Compress::Zlib::inflateStream   s
1597     CODE:
1598         RETVAL = s->stream.total_in ;
1599     OUTPUT:
1600         RETVAL
1601
1602 uLong
1603 adler32(s)
1604         Compress::Zlib::inflateStream   s
1605     CODE:
1606         RETVAL = s->adler32 ;
1607     OUTPUT:
1608         RETVAL
1609
1610 uLong
1611 total_out(s)
1612         Compress::Zlib::inflateStream   s
1613     CODE:
1614         RETVAL = s->stream.total_out ;
1615     OUTPUT:
1616         RETVAL
1617
1618 char*
1619 msg(s)
1620         Compress::Zlib::inflateStream   s
1621     CODE:
1622         RETVAL = s->stream.msg;
1623     OUTPUT:
1624         RETVAL
1625
1626
1627 uLong
1628 get_Bufsize(s)
1629         Compress::Zlib::inflateStream   s
1630     CODE:
1631         RETVAL = s->bufsize ;
1632     OUTPUT:
1633         RETVAL
1634
1635 bool
1636 set_Append(s, mode)
1637         Compress::Zlib::inflateStream   s
1638         bool    mode
1639     CODE:
1640         RETVAL = ((s->flags & FLAG_APPEND) == FLAG_APPEND);
1641         if (mode)
1642             s->flags |= FLAG_APPEND ;
1643         else
1644             s->flags &= ~FLAG_APPEND ;
1645     OUTPUT:
1646         RETVAL
1647
1648 MODULE = Compress::Zlib PACKAGE = Compress::Zlib::inflateScanStream
1649
1650 void
1651 DESTROY(s)
1652     Compress::Zlib::inflateScanStream   s
1653   CODE:
1654     inflateEnd(&s->stream) ;
1655     if (s->dictionary)
1656         SvREFCNT_dec(s->dictionary) ;
1657 #ifndef SETP_BYTE
1658     if (s->deflateParams_out_buffer)
1659         Safefree(s->deflateParams_out_buffer);
1660 #endif
1661 #ifdef MAGIC_APPEND
1662     if (s->window)
1663         Safefree(s->window);
1664 #endif
1665     Safefree(s) ;
1666
1667 void
1668 DispStream(s, message=NULL)
1669     Compress::Zlib::inflateScanStream   s
1670     char *  message
1671
1672 DualType
1673 inflateReset(s)
1674     Compress::Zlib::inflateScanStream   s
1675   CODE:
1676       RETVAL = inflateReset(&(s->stream)) ;
1677       if (RETVAL == Z_OK) {
1678           PostInitStream(s, s->flags, s->bufsize, s->WindowBits) ;
1679       }
1680     OUTPUT:
1681       RETVAL
1682
1683 DualType
1684 scan(s, buf, out=NULL, eof=FALSE)
1685     Compress::Zlib::inflateScanStream   s
1686     SV *        buf
1687     SV *        out
1688     bool        eof
1689     bool        eof_mode = FALSE;
1690     int    start_len = NO_INIT
1691     STRLEN stmp      = NO_INIT
1692   CODE:
1693     /* If the input buffer is a reference, dereference it */
1694 #ifndef MAGIC_APPEND
1695         buf = buf;
1696         croak("scan needs zlib 1.2.1 or better");
1697 #else
1698     buf = deRef(buf, "inflateScan") ;
1699 #ifdef UTF8_AVAILABLE
1700     if (DO_UTF8(buf) && !sv_utf8_downgrade(buf, 1))
1701         croak("Wide character in Compress::Zlib::InflateScan::scan input parameter");
1702 #endif
1703     /* initialise the input buffer */
1704     s->stream.next_in = (Bytef*)SvPVbyte_force(buf, stmp) ;
1705     s->stream.avail_in = SvCUR(buf) ;
1706     start_len = s->stream.avail_in ;
1707     s->bytesInflated = 0 ;
1708     do
1709     {
1710         if (s->stream.avail_in == 0) {
1711             RETVAL = Z_OK ;
1712             break ;
1713         }
1714
1715         /* set up output to next available section of sliding window */
1716         s->stream.avail_out = WINDOW_SIZE - s->window_have;
1717         s->stream.next_out = s->window + s->window_have;
1718
1719         /* DispStream(s, "before inflate\n"); */
1720
1721         /* inflate and check for errors */
1722         RETVAL = inflate(&(s->stream), Z_BLOCK);
1723
1724         if (start_len > 1 && ! eof_mode)
1725             s->window_lastByte = *(s->stream.next_in - 1 ) ;
1726
1727         if (RETVAL == Z_STREAM_ERROR || RETVAL == Z_MEM_ERROR ||
1728             RETVAL == Z_DATA_ERROR )
1729             break ;
1730
1731         if (s->flags & FLAG_CRC32 )
1732             s->crc32 = crc32(s->crc32, s->window + s->window_have,
1733                              WINDOW_SIZE - s->window_have - s->stream.avail_out);
1734
1735         if (s->flags & FLAG_ADLER32)
1736             s->adler32 = adler32(s->adler32, s->window + s->window_have,
1737                                  WINDOW_SIZE - s->window_have - s->stream.avail_out);
1738
1739         s->uncompressedBytes =
1740         s->bytesInflated += WINDOW_SIZE - s->window_have - s->stream.avail_out;
1741
1742         if (s->stream.avail_out)
1743             s->window_have = WINDOW_SIZE - s->stream.avail_out;
1744         else {
1745             s->window_have = 0;
1746             s->window_full = 1;
1747         }
1748
1749         /* process end of block */
1750         if (s->stream.data_type & 128) {
1751             if (s->stream.data_type & 64) {
1752                 s->window_left = s->stream.data_type & 0x1f;
1753             }
1754             else {
1755                 s->window_lastbit = s->stream.data_type & 0x1f;
1756                 s->lastBlockOffset = s->stream.total_in;
1757             }
1758         }
1759
1760     } while (RETVAL != Z_STREAM_END);
1761
1762     s->last_error = RETVAL ;
1763     s->window_lastoff = s->stream.total_in ;
1764     s->compressedBytes += SvCUR(buf) - s->stream.avail_in  ;
1765
1766     if (RETVAL == Z_STREAM_END)
1767     {
1768         s->matchedEndBlock = 1 ;
1769
1770         /* save the location of the end of the compressed data */
1771         s->window_end = SvCUR(buf) - s->stream.avail_in - 1 ;
1772         s->window_endOffset = s->stream.total_in ;
1773         if (s->window_left)
1774         {
1775             -- s->window_endOffset ;
1776         }
1777
1778         /* if window wrapped, build dictionary from window by rotating */
1779         if (s->window_full) {
1780             rotate(s->window, WINDOW_SIZE, s->window_have);
1781             s->window_have = WINDOW_SIZE;
1782         }
1783
1784         /* if (s->flags & FLAG_CONSUME_INPUT) { */
1785         if (1) {
1786             unsigned in = s->stream.avail_in ;
1787             SvCUR_set(buf, in) ;
1788             if (in)
1789                 Move(s->stream.next_in, SvPVbyte_nolen(buf), in, char) ;
1790                 *SvEND(buf) = '\0';
1791                 SvSETMAGIC(buf);
1792         }
1793     }
1794 #endif
1795   OUTPUT:
1796         RETVAL
1797
1798
1799 uLong
1800 getEndOffset(s)
1801     Compress::Zlib::inflateScanStream   s
1802     CODE:
1803 #ifndef MAGIC_APPEND
1804         croak("getEndOffset needs zlib 1.2.1 or better");
1805 #else
1806         RETVAL = s->window_endOffset;
1807 #endif
1808   OUTPUT:
1809         RETVAL
1810
1811 uLong
1812 inflateCount(s)
1813     Compress::Zlib::inflateScanStream   s
1814     CODE:
1815 #ifndef MAGIC_APPEND
1816         croak("inflateCount needs zlib 1.2.1 or better");
1817 #else
1818         RETVAL = s->bytesInflated;
1819 #endif
1820   OUTPUT:
1821         RETVAL
1822
1823 uLong
1824 compressedBytes(s)
1825     Compress::Zlib::inflateStream       s
1826     CODE:
1827         RETVAL = s->compressedBytes;
1828   OUTPUT:
1829         RETVAL
1830
1831 uLong
1832 uncompressedBytes(s)
1833     Compress::Zlib::inflateStream       s
1834     CODE:
1835         RETVAL = s->uncompressedBytes;
1836   OUTPUT:
1837         RETVAL
1838
1839
1840 uLong
1841 getLastBlockOffset(s)
1842     Compress::Zlib::inflateScanStream   s
1843     CODE:
1844 #ifndef MAGIC_APPEND
1845         croak("getLastBlockOffset needs zlib 1.2.1 or better");
1846 #else
1847         RETVAL = s->lastBlockOffset - (s->window_lastbit != 0);
1848 #endif
1849   OUTPUT:
1850         RETVAL
1851
1852 uLong
1853 getLastBufferOffset(s)
1854     Compress::Zlib::inflateScanStream   s
1855     CODE:
1856 #ifndef MAGIC_APPEND
1857         croak("getLastBufferOffset needs zlib 1.2.1 or better");
1858 #else
1859         RETVAL = s->window_lastoff;
1860 #endif
1861   OUTPUT:
1862         RETVAL
1863
1864 void
1865 resetLastBlockByte(s, byte)
1866     Compress::Zlib::inflateScanStream   s
1867     unsigned char*                      byte
1868     CODE:
1869 #ifndef MAGIC_APPEND
1870         croak("resetLastBlockByte needs zlib 1.2.1 or better");
1871 #else
1872         *byte = *byte ^ (1 << ((8 - s->window_lastbit) & 7));
1873 #endif
1874
1875
1876 void
1877 _createDeflateStream(inf_s, flags,level, method, windowBits, memLevel, strategy, bufsize)
1878     Compress::Zlib::inflateScanStream   inf_s
1879     int flags
1880     int level
1881     int method
1882     int windowBits
1883     int memLevel
1884     int strategy
1885     uLong bufsize
1886   PPCODE:
1887   {
1888 #ifndef MAGIC_APPEND
1889         flags = flags;
1890         level = level ;
1891         method = method;
1892         windowBits = windowBits;
1893         memLevel = memLevel;
1894         strategy = strategy;
1895         bufsize= bufsize;
1896         croak("_createDeflateStream needs zlib 1.2.1 or better");
1897 #else
1898     int err ;
1899     deflateStream s ;
1900
1901     if (trace)
1902         warn("in _createDeflateStream(level=%d, method=%d, windowBits=%d, memLevel=%d, strategy=%d, bufsize=%lu\n",
1903         level, method, windowBits, memLevel, strategy, bufsize) ;
1904     if ((s = InitStream() )) {
1905
1906         s->Level      = level;
1907         s->Method     = method;
1908         s->WindowBits = windowBits;
1909         s->MemLevel   = memLevel;
1910         s->Strategy   = strategy;
1911
1912         err = deflateInit2(&(s->stream), level,
1913                            method, windowBits, memLevel, strategy);
1914
1915         if (err == Z_OK) {
1916             err = deflateSetDictionary(&(s->stream), inf_s->window, inf_s->window_have);
1917             s->dict_adler = s->stream.adler ;
1918         }
1919
1920         if (err != Z_OK) {
1921             Safefree(s) ;
1922             s = NULL ;
1923         }
1924         else {
1925             PostInitStream(s, flags, bufsize, windowBits) ;
1926             s->crc32            = inf_s->crc32;
1927             s->adler32          = inf_s->adler32;
1928             s->stream.adler     = inf_s->stream.adler ;
1929             /* s->stream.total_out = inf_s->bytesInflated ; */
1930             s->stream.total_in  = inf_s->stream.total_out ;
1931             if (inf_s->window_left) {
1932                 /* printf("** window_left %d, window_lastByte %d\n", inf_s->window_left, inf_s->window_lastByte); */
1933                 deflatePrime(&(s->stream), 8 - inf_s->window_left, inf_s->window_lastByte);
1934             }
1935         }
1936     }
1937     else
1938         err = Z_MEM_ERROR ;
1939
1940     XPUSHs(sv_setref_pv(sv_newmortal(),
1941             "Compress::Zlib::deflateStream", (void*)s));
1942     if (GIMME == G_ARRAY) {
1943         SV * sv = sv_2mortal(newSViv(err)) ;
1944         setDUALstatus(sv, err);
1945         XPUSHs(sv) ;
1946     }
1947 #endif
1948   }
1949
1950 DualType
1951 status(s)
1952         Compress::Zlib::inflateScanStream   s
1953     CODE:
1954         RETVAL = s->last_error ;
1955     OUTPUT:
1956         RETVAL
1957
1958 uLong
1959 crc32(s)
1960         Compress::Zlib::inflateScanStream   s
1961     CODE:
1962         RETVAL = s->crc32 ;
1963     OUTPUT:
1964         RETVAL
1965
1966
1967 uLong
1968 adler32(s)
1969         Compress::Zlib::inflateScanStream   s
1970     CODE:
1971         RETVAL = s->adler32 ;
1972     OUTPUT:
1973         RETVAL
1974