Mercurial > vba-clojure
view src/common/memgzio.c @ 420:acc3d1ad24e8
Found HP restored by SODA POP, FRESH WATER, LEMONADE; also found number of steps for REPEL, SUPER REPEL, MAX REPEL.
author | Dylan Holmes <ocsenave@gmail.com> |
---|---|
date | Sat, 14 Apr 2012 09:27:49 -0500 |
parents | f9f4f1b99eed |
children |
line wrap: on
line source
1 /* gzio.c -- IO on .gz files2 * Copyright (C) 1995-2002 Jean-loup Gailly.3 * For conditions of distribution and use, see copyright notice in zlib.h4 *5 * Compile this file with -DNO_DEFLATE to avoid the compression code.6 */8 /* memgzio.c - IO on .gz files in memory9 * Adapted from original gzio.c from zlib library by Forgotten10 */12 /* @(#) $Id: memgzio.c,v 1.5 2006/06/06 21:04:20 spacy51 Exp $ */14 #include <stdio.h>15 #include <stdarg.h>16 #include <stdlib.h>17 #include <string.h>18 #include <errno.h>20 #include "memgzio.h"22 #ifndef local23 #define local static24 #endif26 #ifndef DEF_MEM_LEVEL27 # define DEF_MEM_LEVEL 828 #endif30 #ifndef OS_CODE31 #define OS_CODE 332 #endif34 #ifndef zmemcpy35 #define zmemcpy memcpy36 #endif38 /*struct internal_state {int dummy;};*/ /* for buggy compilers */40 #ifndef Z_BUFSIZE41 # ifdef MAXSEG_64K42 # define Z_BUFSIZE 4096 /* minimize memory usage for 16-bit DOS */43 # else44 # define Z_BUFSIZE 1638445 # endif46 #endif47 #ifndef Z_PRINTF_BUFSIZE48 # define Z_PRINTF_BUFSIZE 409649 #endif51 #define ALLOC(size) malloc(size)52 #define TRYFREE(p) \53 {if (p) \54 free(p);}56 static int gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */58 /* gzip flag byte */59 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */60 #define HEAD_CRC 0x02 /* bit 1 set: header CRC present */61 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */62 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */63 #define COMMENT 0x10 /* bit 4 set: file comment present */64 #define RESERVED 0xE0 /* bits 5..7: reserved */66 typedef struct _MemFile67 {68 char *memory;69 char *next;70 int available;71 int error;72 char mode;73 } MEMFILE;75 typedef struct mem_stream76 {77 z_stream stream;78 int z_err; /* error code for last stream operation */79 int z_eof; /* set if end of input file */80 MEMFILE *file; /* memoru file */81 Byte * inbuf; /* input buffer */82 Byte * outbuf; /* output buffer */83 uLong crc; /* crc32 of uncompressed data */84 char * msg; /* error message */85 int transparent; /* 1 if input file is not a .gz file */86 char mode; /* 'w' or 'r' */87 long startpos; /* start of compressed data in file (header skipped) */88 } mem_stream;90 local gzFile gz_open OF((char *memory, const int available, const char *mode));91 local int do_flush OF((gzFile file, int flush));92 local int get_byte OF((mem_stream *s));93 local void check_header OF((mem_stream *s));94 local int destroy OF((mem_stream *s));95 local void putLong OF((MEMFILE *file, uLong x));96 local uLong getLong OF((mem_stream *s));98 local MEMFILE *memOpen(char *memory, int available, char mode)99 {100 MEMFILE *f;102 if (available <= 8)103 return NULL;105 if (mode != 'w' && mode != 'r')106 return NULL;108 f = (MEMFILE *)malloc(sizeof(MEMFILE));110 f->memory = memory;111 f->mode = mode;112 f->error = 0;114 if (mode == 'w')115 {116 f->available = available - 8;117 f->next = memory + 8;118 memory[0] = 'V';119 memory[1] = 'B';120 memory[2] = 'A';121 memory[3] = ' ';122 *((int *)(memory+4)) = 0;123 }124 else125 {126 if (memory[0] != 'V' || memory[1] != 'B' || memory[2] != 'A' ||127 memory[3] != ' ')128 {129 free(f);130 return NULL;131 }132 f->available = *((int *)(memory+4));133 f->next = memory+8;134 }136 return f;137 }139 local size_t memWrite(const void *buffer, size_t size, size_t count,140 MEMFILE *file)141 {142 size_t total = size*count;144 if (file->mode != 'w')145 {146 file->error = 1;147 return 0;148 }150 if (total > (size_t)file->available)151 {152 total = file->available;153 }154 memcpy(file->next, buffer, total);155 file->available -= (int)total;156 file->next += total;157 return total;158 }160 local size_t memRead(void *buffer, size_t size, size_t count,161 MEMFILE *file)162 {163 size_t total = size*count;165 if (file->mode != 'r')166 {167 file->error = 1;168 return 0;169 }171 if (file->available == 0)172 return -1;174 if (total > (size_t)file->available)175 {176 total = file->available;177 }178 memcpy(buffer, file->next, total);179 file->available -= (int)total;180 file->next += total;181 return total;182 }184 local int memPutc(int c, MEMFILE *file)185 {186 if (file->mode != 'w')187 {188 file->error = 1;189 return -1;190 }192 if (file->available >= 1)193 {194 *file->next++ = c;195 file->available--;196 }197 else198 return -1;200 return c;201 }203 local long memTell(MEMFILE *f)204 {205 return (long)(f->next - f->memory) - 8;206 }208 local int memError(MEMFILE *f)209 {210 return f->error;211 }213 local int memClose(MEMFILE *f)214 {215 if (f->mode == 'w')216 {217 *((int *)(f->memory+4)) = memTell(f);218 }219 free(f);220 return 0;221 }223 local int memPrintf(MEMFILE *f, const char *format, ...)224 {225 char buffer[80];226 va_list list;227 int len;229 va_start(list, format);230 len = vsprintf(buffer, format, list);231 va_end(list);233 return (int)memWrite(buffer, 1, len, f);234 }236 /* ===========================================================================237 Opens a gzip (.gz) file for reading or writing. The mode parameter238 is as in fopen ("rb" or "wb"). The file is given either by file descriptor239 or path name (if fd == -1).240 gz_open return NULL if the file could not be opened or if there was241 insufficient memory to allocate the (de)compression state; errno242 can be checked to distinguish the two cases (if errno is zero, the243 zlib error is Z_MEM_ERROR).244 */245 local gzFile gz_open(memory, available, mode)246 char *memory;247 const int available;248 const char *mode;249 {250 int err;251 int level = Z_DEFAULT_COMPRESSION; /* compression level */252 int strategy = Z_DEFAULT_STRATEGY; /* compression strategy */253 char * p = (char *)mode;254 mem_stream *s;255 char fmode[80]; /* copy of mode, without the compression level */256 char * m = fmode;258 s = (mem_stream *)ALLOC(sizeof(mem_stream));259 if (!s)260 return Z_NULL;262 s->stream.zalloc = (alloc_func)0;263 s->stream.zfree = (free_func)0;264 s->stream.opaque = (voidpf)0;265 s->stream.next_in = s->inbuf = Z_NULL;266 s->stream.next_out = s->outbuf = Z_NULL;267 s->stream.avail_in = s->stream.avail_out = 0;268 s->z_err = Z_OK;269 s->z_eof = 0;270 s->crc = crc32(0L, Z_NULL, 0);271 s->msg = NULL;272 s->transparent = 0;273 s->file = NULL;275 s->mode = '\0';276 do277 {278 if (*p == 'r')279 s->mode = 'r';280 if (*p == 'w' || *p == 'a')281 s->mode = 'w';282 if (*p >= '0' && *p <= '9')283 {284 level = *p - '0';285 }286 else if (*p == 'f')287 {288 strategy = Z_FILTERED;289 }290 else if (*p == 'h')291 {292 strategy = Z_HUFFMAN_ONLY;293 }294 else295 {296 *m++ = *p; /* copy the mode */297 }298 }299 while (*p++ && m != fmode + sizeof(fmode));300 if (s->mode == '\0')301 return destroy(s), (gzFile)Z_NULL;303 if (s->mode == 'w')304 {305 #ifdef NO_DEFLATE306 err = Z_STREAM_ERROR;307 #else308 err = deflateInit2(&(s->stream), level,309 Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, strategy);310 /* windowBits is passed < 0 to suppress zlib header */312 s->stream.next_out = s->outbuf = (Byte *)ALLOC(Z_BUFSIZE);313 #endif314 if (err != Z_OK || s->outbuf == Z_NULL)315 {316 return destroy(s), (gzFile)Z_NULL;317 }318 }319 else320 {321 s->stream.next_in = s->inbuf = (Byte *)ALLOC(Z_BUFSIZE);323 err = inflateInit2(&(s->stream), -MAX_WBITS);324 /* windowBits is passed < 0 to tell that there is no zlib header.325 * Note that in this case inflate *requires* an extra "dummy" byte326 * after the compressed stream in order to complete decompression and327 * return Z_STREAM_END. Here the gzip CRC32 ensures that 4 bytes are328 * present after the compressed stream.329 */330 if (err != Z_OK || s->inbuf == Z_NULL)331 {332 return destroy(s), (gzFile)Z_NULL;333 }334 }335 s->stream.avail_out = Z_BUFSIZE;337 errno = 0;338 s->file = memOpen(memory, available, s->mode);340 if (s->file == NULL)341 {342 return destroy(s), (gzFile)Z_NULL;343 }345 if (s->mode == 'w')346 {347 /* Write a very simple .gz header:348 */349 memPrintf(s->file, "%c%c%c%c%c%c%c%c%c%c", gz_magic[0], gz_magic[1],350 Z_DEFLATED, 0 /*flags*/, 0, 0, 0, 0 /*time*/, 0 /*xflags*/, OS_CODE);351 s->startpos = 10L;352 /* We use 10L instead of ftell(s->file) to because ftell causes an353 * fflush on some systems. This version of the library doesn't use354 * startpos anyway in write mode, so this initialization is not355 * necessary.356 */357 }358 else359 {360 check_header(s); /* skip the .gz header */361 s->startpos = (memTell(s->file) - s->stream.avail_in);362 }364 return (gzFile)s;365 }367 /* ===========================================================================368 Opens a gzip (.gz) file for reading or writing.369 */370 gzFile ZEXPORT memgzopen(memory, available, mode)371 char *memory;372 int available;373 const char *mode;374 {375 return gz_open(memory, available, mode);376 }378 /* ===========================================================================379 Read a byte from a mem_stream; update next_in and avail_in. Return EOF380 for end of file.381 IN assertion: the stream s has been sucessfully opened for reading.382 */383 local int get_byte(s)384 mem_stream *s;385 {386 if (s->z_eof)387 return EOF;388 if (s->stream.avail_in == 0)389 {390 errno = 0;391 s->stream.avail_in = (uInt)memRead(s->inbuf, 1, Z_BUFSIZE, s->file);392 if (s->stream.avail_in == 0)393 {394 s->z_eof = 1;395 if (memError(s->file))396 s->z_err = Z_ERRNO;397 return EOF;398 }399 s->stream.next_in = s->inbuf;400 }401 s->stream.avail_in--;402 return *(s->stream.next_in)++;403 }405 /* ===========================================================================406 Check the gzip header of a mem_stream opened for reading. Set the stream407 mode to transparent if the gzip magic header is not present; set s->err408 to Z_DATA_ERROR if the magic header is present but the rest of the header409 is incorrect.410 IN assertion: the stream s has already been created sucessfully;411 s->stream.avail_in is zero for the first time, but may be non-zero412 for concatenated .gz files.413 */414 local void check_header(s)415 mem_stream *s;416 {417 int method; /* method byte */418 int flags; /* flags byte */419 uInt len;420 int c;422 /* Check the gzip magic header */423 for (len = 0; len < 2; len++)424 {425 c = get_byte(s);426 if (c != gz_magic[len])427 {428 if (len != 0)429 s->stream.avail_in++, s->stream.next_in--;430 if (c != EOF)431 {432 s->stream.avail_in++, s->stream.next_in--;433 s->transparent = 1;434 }435 s->z_err = s->stream.avail_in != 0 ? Z_OK : Z_STREAM_END;436 return;437 }438 }439 method = get_byte(s);440 flags = get_byte(s);441 if (method != Z_DEFLATED || (flags & RESERVED) != 0)442 {443 s->z_err = Z_DATA_ERROR;444 return;445 }447 /* Discard time, xflags and OS code: */448 for (len = 0; len < 6; len++)449 (void)get_byte(s);451 if ((flags & EXTRA_FIELD) != 0) /* skip the extra field */452 {453 len = (uInt)get_byte(s);454 len += ((uInt)get_byte(s))<<8;455 /* len is garbage if EOF but the loop below will quit anyway */456 while (len-- != 0 && get_byte(s) != EOF)457 ;458 }459 if ((flags & ORIG_NAME) != 0) /* skip the original file name */460 {461 while ((c = get_byte(s)) != 0 && c != EOF)462 ;463 }464 if ((flags & COMMENT) != 0) /* skip the .gz file comment */465 {466 while ((c = get_byte(s)) != 0 && c != EOF)467 ;468 }469 if ((flags & HEAD_CRC) != 0) /* skip the header crc */470 {471 for (len = 0; len < 2; len++)472 (void)get_byte(s);473 }474 s->z_err = s->z_eof ? Z_DATA_ERROR : Z_OK;475 }477 /* ===========================================================================478 * Cleanup then free the given mem_stream. Return a zlib error code.479 Try freeing in the reverse order of allocations.480 */481 local int destroy(s)482 mem_stream *s;483 {484 int err = Z_OK;486 if (!s)487 return Z_STREAM_ERROR;489 TRYFREE(s->msg);491 if (s->stream.state != NULL)492 {493 if (s->mode == 'w')494 {495 #ifdef NO_DEFLATE496 err = Z_STREAM_ERROR;497 #else498 err = deflateEnd(&(s->stream));499 #endif500 }501 else if (s->mode == 'r')502 {503 err = inflateEnd(&(s->stream));504 }505 }506 if (s->file != NULL && memClose(s->file))507 {508 #ifdef ESPIPE509 if (errno != ESPIPE) /* fclose is broken for pipes in HP/UX */510 #endif511 err = Z_ERRNO;512 }513 if (s->z_err < 0)514 err = s->z_err;516 TRYFREE(s->inbuf);517 TRYFREE(s->outbuf);518 TRYFREE(s);519 return err;520 }522 /* ===========================================================================523 Reads the given number of uncompressed bytes from the compressed file.524 gzread returns the number of bytes actually read (0 for end of file).525 */526 int ZEXPORT memgzread(file, buf, len)527 gzFile file;528 voidp buf;529 unsigned len;530 {531 mem_stream *s = (mem_stream *)file;532 Bytef * start = (Bytef *)buf; /* starting point for crc computation */533 Byte * next_out; /* == stream.next_out but not forced far (for MSDOS) */535 if (s == NULL || s->mode != 'r')536 return Z_STREAM_ERROR;538 if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO)539 return -1;540 if (s->z_err == Z_STREAM_END)541 return 0; /* EOF */543 next_out = (Byte *)buf;544 s->stream.next_out = (Bytef *)buf;545 s->stream.avail_out = len;547 while (s->stream.avail_out != 0)548 {549 if (s->transparent)550 {551 /* Copy first the lookahead bytes: */552 uInt n = s->stream.avail_in;553 if (n > s->stream.avail_out)554 n = s->stream.avail_out;555 if (n > 0)556 {557 zmemcpy(s->stream.next_out, s->stream.next_in, n);558 next_out += n;559 s->stream.next_out = next_out;560 s->stream.next_in += n;561 s->stream.avail_out -= n;562 s->stream.avail_in -= n;563 }564 if (s->stream.avail_out > 0)565 {566 s->stream.avail_out -= (uInt)memRead(next_out, 1, s->stream.avail_out, s->file);567 }568 len -= s->stream.avail_out;569 s->stream.total_in += (uLong)len;570 s->stream.total_out += (uLong)len;571 if (len == 0)572 s->z_eof = 1;573 return (int)len;574 }575 if (s->stream.avail_in == 0 && !s->z_eof)576 {577 errno = 0;578 s->stream.avail_in = (uInt)memRead(s->inbuf, 1, Z_BUFSIZE, s->file);579 if (s->stream.avail_in == 0)580 {581 s->z_eof = 1;582 if (memError(s->file))583 {584 s->z_err = Z_ERRNO;585 break;586 }587 }588 s->stream.next_in = s->inbuf;589 }590 s->z_err = inflate(&(s->stream), Z_NO_FLUSH);592 if (s->z_err == Z_STREAM_END)593 {594 /* Check CRC and original size */595 s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));596 start = s->stream.next_out;598 if (getLong(s) != s->crc)599 {600 s->z_err = Z_DATA_ERROR;601 }602 else603 {604 (void)getLong(s);605 /* The uncompressed length returned by above getlong() may606 * be different from s->stream.total_out) in case of607 * concatenated .gz files. Check for such files:608 */609 check_header(s);610 if (s->z_err == Z_OK)611 {612 uLong total_in = s->stream.total_in;613 uLong total_out = s->stream.total_out;615 inflateReset(&(s->stream));616 s->stream.total_in = total_in;617 s->stream.total_out = total_out;618 s->crc = crc32(0L, Z_NULL, 0);619 }620 }621 }622 if (s->z_err != Z_OK || s->z_eof)623 break;624 }625 s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));627 return (int)(len - s->stream.avail_out);628 }630 #ifndef NO_DEFLATE631 /* ===========================================================================632 Writes the given number of uncompressed bytes into the compressed file.633 gzwrite returns the number of bytes actually written (0 in case of error).634 */635 int ZEXPORT memgzwrite(file, buf, len)636 gzFile file;637 const voidp buf;638 unsigned len;639 {640 mem_stream *s = (mem_stream *)file;642 if (s == NULL || s->mode != 'w')643 return Z_STREAM_ERROR;645 s->stream.next_in = (Bytef *)buf;646 s->stream.avail_in = len;648 while (s->stream.avail_in != 0)649 {650 if (s->stream.avail_out == 0)651 {652 s->stream.next_out = s->outbuf;653 if (memWrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE)654 {655 s->z_err = Z_ERRNO;656 break;657 }658 s->stream.avail_out = Z_BUFSIZE;659 }660 s->z_err = deflate(&(s->stream), Z_NO_FLUSH);661 if (s->z_err != Z_OK)662 break;663 }664 s->crc = crc32(s->crc, (const Bytef *)buf, len);666 return (int)(len - s->stream.avail_in);667 }668 #endif669 /* ===========================================================================670 Flushes all pending output into the compressed file. The parameter671 flush is as in the deflate() function.672 */673 local int do_flush(file, flush)674 gzFile file;675 int flush;676 {677 uInt len;678 int done = 0;679 mem_stream *s = (mem_stream *)file;681 if (s == NULL || s->mode != 'w')682 return Z_STREAM_ERROR;684 s->stream.avail_in = 0; /* should be zero already anyway */686 for (;;)687 {688 len = Z_BUFSIZE - s->stream.avail_out;690 if (len != 0)691 {692 if ((uInt)memWrite(s->outbuf, 1, len, s->file) != len)693 {694 s->z_err = Z_ERRNO;695 return Z_ERRNO;696 }697 s->stream.next_out = s->outbuf;698 s->stream.avail_out = Z_BUFSIZE;699 }700 if (done)701 break;702 s->z_err = deflate(&(s->stream), flush);704 /* Ignore the second of two consecutive flushes: */705 if (len == 0 && s->z_err == Z_BUF_ERROR)706 s->z_err = Z_OK;708 /* deflate has finished flushing only when it hasn't used up709 * all the available space in the output buffer:710 */711 done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END);713 if (s->z_err != Z_OK && s->z_err != Z_STREAM_END)714 break;715 }716 return s->z_err == Z_STREAM_END ? Z_OK : s->z_err;717 }719 /* ===========================================================================720 Outputs a long in LSB order to the given file721 */722 local void putLong(file, x)723 MEMFILE *file;724 uLong x;725 {726 int n;727 for (n = 0; n < 4; n++)728 {729 memPutc((int)(x & 0xff), file);730 x >>= 8;731 }732 }734 /* ===========================================================================735 Reads a long in LSB order from the given mem_stream. Sets z_err in case736 of error.737 */738 local uLong getLong(s)739 mem_stream *s;740 {741 uLong x = (uLong)get_byte(s);742 int c;744 x += ((uLong)get_byte(s))<<8;745 x += ((uLong)get_byte(s))<<16;746 c = get_byte(s);747 if (c == EOF)748 s->z_err = Z_DATA_ERROR;749 x += ((uLong)c)<<24;750 return x;751 }753 /* ===========================================================================754 Flushes all pending output if necessary, closes the compressed file755 and deallocates all the (de)compression state.756 */757 int ZEXPORT memgzclose(file)758 gzFile file;759 {760 int err;761 mem_stream *s = (mem_stream *)file;763 if (s == NULL)764 return Z_STREAM_ERROR;766 if (s->mode == 'w')767 {768 #ifdef NO_DEFLATE769 return Z_STREAM_ERROR;770 #else771 err = do_flush(file, Z_FINISH);772 if (err != Z_OK)773 return destroy((mem_stream *)file);775 putLong(s->file, s->crc);776 putLong(s->file, s->stream.total_in);777 #endif778 }779 return destroy((mem_stream *)file);780 }782 long ZEXPORT memtell(file)783 gzFile file;784 {785 mem_stream *s = (mem_stream *)file;787 if (s == NULL)788 return Z_STREAM_ERROR;790 return memTell(s->file);791 }