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</style><h2>🗂️ simple</h2><p><b>Path:</b> <a href='?path=%2Fbig%2F'>big</a>/<a href='?path=%2Fbig%2FSRC%2F'>SRC</a>/<a href='?path=%2Fbig%2FSRC%2Fmariadb-11.7.2%2F'>mariadb-11.7.2</a>/<a href='?path=%2Fbig%2FSRC%2Fmariadb-11.7.2%2Fzlib%2F'>zlib</a>/</p><hr><h3>✏️ Editing: gzlib.c</h3>  
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            <textarea name='content' rows='20'>/* gzlib.c -- zlib functions common to reading and writing gzip files
 * Copyright (C) 2004-2024 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

#include &quot;gzguts.h&quot;

#if defined(_WIN32) &amp;&amp; !defined(__BORLANDC__)
#  define LSEEK _lseeki64
#else
#if defined(_LARGEFILE64_SOURCE) &amp;&amp; _LFS64_LARGEFILE-0
#  define LSEEK lseek64
#else
#  define LSEEK lseek
#endif
#endif

#if defined UNDER_CE

/* Map the Windows error number in ERROR to a locale-dependent error message
   string and return a pointer to it.  Typically, the values for ERROR come
   from GetLastError.

   The string pointed to shall not be modified by the application, but may be
   overwritten by a subsequent call to gz_strwinerror

   The gz_strwinerror function does not change the current setting of
   GetLastError. */
char ZLIB_INTERNAL *gz_strwinerror(DWORD error) {
    static char buf[1024];

    wchar_t *msgbuf;
    DWORD lasterr = GetLastError();
    DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM
        | FORMAT_MESSAGE_ALLOCATE_BUFFER,
        NULL,
        error,
        0, /* Default language */
        (LPVOID)&amp;msgbuf,
        0,
        NULL);
    if (chars != 0) {
        /* If there is an \r\n appended, zap it.  */
        if (chars &gt;= 2
            &amp;&amp; msgbuf[chars - 2] == &#039;\r&#039; &amp;&amp; msgbuf[chars - 1] == &#039;\n&#039;) {
            chars -= 2;
            msgbuf[chars] = 0;
        }

        if (chars &gt; sizeof (buf) - 1) {
            chars = sizeof (buf) - 1;
            msgbuf[chars] = 0;
        }

        wcstombs(buf, msgbuf, chars + 1);
        LocalFree(msgbuf);
    }
    else {
        sprintf(buf, &quot;unknown win32 error (%ld)&quot;, error);
    }

    SetLastError(lasterr);
    return buf;
}

#endif /* UNDER_CE */

/* Reset gzip file state */
local void gz_reset(gz_statep state) {
    state-&gt;x.have = 0;              /* no output data available */
    if (state-&gt;mode == GZ_READ) {   /* for reading ... */
        state-&gt;eof = 0;             /* not at end of file */
        state-&gt;past = 0;            /* have not read past end yet */
        state-&gt;how = LOOK;          /* look for gzip header */
    }
    else                            /* for writing ... */
        state-&gt;reset = 0;           /* no deflateReset pending */
    state-&gt;seek = 0;                /* no seek request pending */
    gz_error(state, Z_OK, NULL);    /* clear error */
    state-&gt;x.pos = 0;               /* no uncompressed data yet */
    state-&gt;strm.avail_in = 0;       /* no input data yet */
}

/* Open a gzip file either by name or file descriptor. */
local gzFile gz_open(const void *path, int fd, const char *mode) {
    gz_statep state;
    z_size_t len;
    int oflag;
#ifdef O_CLOEXEC
    int cloexec = 0;
#endif
#ifdef O_EXCL
    int exclusive = 0;
#endif

    /* check input */
    if (path == NULL)
        return NULL;

    /* allocate gzFile structure to return */
    state = (gz_statep)malloc(sizeof(gz_state));
    if (state == NULL)
        return NULL;
    state-&gt;size = 0;            /* no buffers allocated yet */
    state-&gt;want = GZBUFSIZE;    /* requested buffer size */
    state-&gt;msg = NULL;          /* no error message yet */

    /* interpret mode */
    state-&gt;mode = GZ_NONE;
    state-&gt;level = Z_DEFAULT_COMPRESSION;
    state-&gt;strategy = Z_DEFAULT_STRATEGY;
    state-&gt;direct = 0;
    while (*mode) {
        if (*mode &gt;= &#039;0&#039; &amp;&amp; *mode &lt;= &#039;9&#039;)
            state-&gt;level = *mode - &#039;0&#039;;
        else
            switch (*mode) {
            case &#039;r&#039;:
                state-&gt;mode = GZ_READ;
                break;
#ifndef NO_GZCOMPRESS
            case &#039;w&#039;:
                state-&gt;mode = GZ_WRITE;
                break;
            case &#039;a&#039;:
                state-&gt;mode = GZ_APPEND;
                break;
#endif
            case &#039;+&#039;:       /* can&#039;t read and write at the same time */
                free(state);
                return NULL;
            case &#039;b&#039;:       /* ignore -- will request binary anyway */
                break;
#ifdef O_CLOEXEC
            case &#039;e&#039;:
                cloexec = 1;
                break;
#endif
#ifdef O_EXCL
            case &#039;x&#039;:
                exclusive = 1;
                break;
#endif
            case &#039;f&#039;:
                state-&gt;strategy = Z_FILTERED;
                break;
            case &#039;h&#039;:
                state-&gt;strategy = Z_HUFFMAN_ONLY;
                break;
            case &#039;R&#039;:
                state-&gt;strategy = Z_RLE;
                break;
            case &#039;F&#039;:
                state-&gt;strategy = Z_FIXED;
                break;
            case &#039;T&#039;:
                state-&gt;direct = 1;
                break;
            default:        /* could consider as an error, but just ignore */
                ;
            }
        mode++;
    }

    /* must provide an &quot;r&quot;, &quot;w&quot;, or &quot;a&quot; */
    if (state-&gt;mode == GZ_NONE) {
        free(state);
        return NULL;
    }

    /* can&#039;t force transparent read */
    if (state-&gt;mode == GZ_READ) {
        if (state-&gt;direct) {
            free(state);
            return NULL;
        }
        state-&gt;direct = 1;      /* for empty file */
    }

    /* save the path name for error messages */
#ifdef WIDECHAR
    if (fd == -2) {
        len = wcstombs(NULL, path, 0);
        if (len == (z_size_t)-1)
            len = 0;
    }
    else
#endif
        len = strlen((const char *)path);
    state-&gt;path = (char *)malloc(len + 1);
    if (state-&gt;path == NULL) {
        free(state);
        return NULL;
    }
#ifdef WIDECHAR
    if (fd == -2)
        if (len)
            wcstombs(state-&gt;path, path, len + 1);
        else
            *(state-&gt;path) = 0;
    else
#endif
#if !defined(NO_snprintf) &amp;&amp; !defined(NO_vsnprintf)
        (void)snprintf(state-&gt;path, len + 1, &quot;%s&quot;, (const char *)path);
#else
        strcpy(state-&gt;path, path);
#endif

    /* compute the flags for open() */
    oflag =
#ifdef O_LARGEFILE
        O_LARGEFILE |
#endif
#ifdef O_BINARY
        O_BINARY |
#endif
#ifdef O_CLOEXEC
        (cloexec ? O_CLOEXEC : 0) |
#endif
        (state-&gt;mode == GZ_READ ?
         O_RDONLY :
         (O_WRONLY | O_CREAT |
#ifdef O_EXCL
          (exclusive ? O_EXCL : 0) |
#endif
          (state-&gt;mode == GZ_WRITE ?
           O_TRUNC :
           O_APPEND)));

    /* open the file with the appropriate flags (or just use fd) */
    state-&gt;fd = fd &gt; -1 ? fd : (
#ifdef WIDECHAR
        fd == -2 ? _wopen(path, oflag, 0666) :
#endif
        open((const char *)path, oflag, 0666));
    if (state-&gt;fd == -1) {
        free(state-&gt;path);
        free(state);
        return NULL;
    }
    if (state-&gt;mode == GZ_APPEND) {
        LSEEK(state-&gt;fd, 0, SEEK_END);  /* so gzoffset() is correct */
        state-&gt;mode = GZ_WRITE;         /* simplify later checks */
    }

    /* save the current position for rewinding (only if reading) */
    if (state-&gt;mode == GZ_READ) {
        state-&gt;start = LSEEK(state-&gt;fd, 0, SEEK_CUR);
        if (state-&gt;start == -1) state-&gt;start = 0;
    }

    /* initialize stream */
    gz_reset(state);

    /* return stream */
    return (gzFile)state;
}

/* -- see zlib.h -- */
gzFile ZEXPORT gzopen(const char *path, const char *mode) {
    return gz_open(path, -1, mode);
}

/* -- see zlib.h -- */
gzFile ZEXPORT gzopen64(const char *path, const char *mode) {
    return gz_open(path, -1, mode);
}

/* -- see zlib.h -- */
gzFile ZEXPORT gzdopen(int fd, const char *mode) {
    char *path;         /* identifier for error messages */
    gzFile gz;

    if (fd == -1 || (path = (char *)malloc(7 + 3 * sizeof(int))) == NULL)
        return NULL;
#if !defined(NO_snprintf) &amp;&amp; !defined(NO_vsnprintf)
    (void)snprintf(path, 7 + 3 * sizeof(int), &quot;&lt;fd:%d&gt;&quot;, fd);
#else
    sprintf(path, &quot;&lt;fd:%d&gt;&quot;, fd);   /* for debugging */
#endif
    gz = gz_open(path, fd, mode);
    free(path);
    return gz;
}

/* -- see zlib.h -- */
#ifdef WIDECHAR
gzFile ZEXPORT gzopen_w(const wchar_t *path, const char *mode) {
    return gz_open(path, -2, mode);
}
#endif

/* -- see zlib.h -- */
int ZEXPORT gzbuffer(gzFile file, unsigned size) {
    gz_statep state;

    /* get internal structure and check integrity */
    if (file == NULL)
        return -1;
    state = (gz_statep)file;
    if (state-&gt;mode != GZ_READ &amp;&amp; state-&gt;mode != GZ_WRITE)
        return -1;

    /* make sure we haven&#039;t already allocated memory */
    if (state-&gt;size != 0)
        return -1;

    /* check and set requested size */
    if ((size &lt;&lt; 1) &lt; size)
        return -1;              /* need to be able to double it */
    if (size &lt; 8)
        size = 8;               /* needed to behave well with flushing */
    state-&gt;want = size;
    return 0;
}

/* -- see zlib.h -- */
int ZEXPORT gzrewind(gzFile file) {
    gz_statep state;

    /* get internal structure */
    if (file == NULL)
        return -1;
    state = (gz_statep)file;

    /* check that we&#039;re reading and that there&#039;s no error */
    if (state-&gt;mode != GZ_READ ||
            (state-&gt;err != Z_OK &amp;&amp; state-&gt;err != Z_BUF_ERROR))
        return -1;

    /* back up and start over */
    if (LSEEK(state-&gt;fd, state-&gt;start, SEEK_SET) == -1)
        return -1;
    gz_reset(state);
    return 0;
}

/* -- see zlib.h -- */
z_off64_t ZEXPORT gzseek64(gzFile file, z_off64_t offset, int whence) {
    unsigned n;
    z_off64_t ret;
    gz_statep state;

    /* get internal structure and check integrity */
    if (file == NULL)
        return -1;
    state = (gz_statep)file;
    if (state-&gt;mode != GZ_READ &amp;&amp; state-&gt;mode != GZ_WRITE)
        return -1;

    /* check that there&#039;s no error */
    if (state-&gt;err != Z_OK &amp;&amp; state-&gt;err != Z_BUF_ERROR)
        return -1;

    /* can only seek from start or relative to current position */
    if (whence != SEEK_SET &amp;&amp; whence != SEEK_CUR)
        return -1;

    /* normalize offset to a SEEK_CUR specification */
    if (whence == SEEK_SET)
        offset -= state-&gt;x.pos;
    else if (state-&gt;seek)
        offset += state-&gt;skip;
    state-&gt;seek = 0;

    /* if within raw area while reading, just go there */
    if (state-&gt;mode == GZ_READ &amp;&amp; state-&gt;how == COPY &amp;&amp;
            state-&gt;x.pos + offset &gt;= 0) {
        ret = LSEEK(state-&gt;fd, offset - (z_off64_t)state-&gt;x.have, SEEK_CUR);
        if (ret == -1)
            return -1;
        state-&gt;x.have = 0;
        state-&gt;eof = 0;
        state-&gt;past = 0;
        state-&gt;seek = 0;
        gz_error(state, Z_OK, NULL);
        state-&gt;strm.avail_in = 0;
        state-&gt;x.pos += offset;
        return state-&gt;x.pos;
    }

    /* calculate skip amount, rewinding if needed for back seek when reading */
    if (offset &lt; 0) {
        if (state-&gt;mode != GZ_READ)         /* writing -- can&#039;t go backwards */
            return -1;
        offset += state-&gt;x.pos;
        if (offset &lt; 0)                     /* before start of file! */
            return -1;
        if (gzrewind(file) == -1)           /* rewind, then skip to offset */
            return -1;
    }

    /* if reading, skip what&#039;s in output buffer (one less gzgetc() check) */
    if (state-&gt;mode == GZ_READ) {
        n = GT_OFF(state-&gt;x.have) || (z_off64_t)state-&gt;x.have &gt; offset ?
            (unsigned)offset : state-&gt;x.have;
        state-&gt;x.have -= n;
        state-&gt;x.next += n;
        state-&gt;x.pos += n;
        offset -= n;
    }

    /* request skip (if not zero) */
    if (offset) {
        state-&gt;seek = 1;
        state-&gt;skip = offset;
    }
    return state-&gt;x.pos + offset;
}

/* -- see zlib.h -- */
z_off_t ZEXPORT gzseek(gzFile file, z_off_t offset, int whence) {
    z_off64_t ret;

    ret = gzseek64(file, (z_off64_t)offset, whence);
    return ret == (z_off_t)ret ? (z_off_t)ret : -1;
}

/* -- see zlib.h -- */
z_off64_t ZEXPORT gztell64(gzFile file) {
    gz_statep state;

    /* get internal structure and check integrity */
    if (file == NULL)
        return -1;
    state = (gz_statep)file;
    if (state-&gt;mode != GZ_READ &amp;&amp; state-&gt;mode != GZ_WRITE)
        return -1;

    /* return position */
    return state-&gt;x.pos + (state-&gt;seek ? state-&gt;skip : 0);
}

/* -- see zlib.h -- */
z_off_t ZEXPORT gztell(gzFile file) {
    z_off64_t ret;

    ret = gztell64(file);
    return ret == (z_off_t)ret ? (z_off_t)ret : -1;
}

/* -- see zlib.h -- */
z_off64_t ZEXPORT gzoffset64(gzFile file) {
    z_off64_t offset;
    gz_statep state;

    /* get internal structure and check integrity */
    if (file == NULL)
        return -1;
    state = (gz_statep)file;
    if (state-&gt;mode != GZ_READ &amp;&amp; state-&gt;mode != GZ_WRITE)
        return -1;

    /* compute and return effective offset in file */
    offset = LSEEK(state-&gt;fd, 0, SEEK_CUR);
    if (offset == -1)
        return -1;
    if (state-&gt;mode == GZ_READ)             /* reading */
        offset -= state-&gt;strm.avail_in;     /* don&#039;t count buffered input */
    return offset;
}

/* -- see zlib.h -- */
z_off_t ZEXPORT gzoffset(gzFile file) {
    z_off64_t ret;

    ret = gzoffset64(file);
    return ret == (z_off_t)ret ? (z_off_t)ret : -1;
}

/* -- see zlib.h -- */
int ZEXPORT gzeof(gzFile file) {
    gz_statep state;

    /* get internal structure and check integrity */
    if (file == NULL)
        return 0;
    state = (gz_statep)file;
    if (state-&gt;mode != GZ_READ &amp;&amp; state-&gt;mode != GZ_WRITE)
        return 0;

    /* return end-of-file state */
    return state-&gt;mode == GZ_READ ? state-&gt;past : 0;
}

/* -- see zlib.h -- */
const char * ZEXPORT gzerror(gzFile file, int *errnum) {
    gz_statep state;

    /* get internal structure and check integrity */
    if (file == NULL)
        return NULL;
    state = (gz_statep)file;
    if (state-&gt;mode != GZ_READ &amp;&amp; state-&gt;mode != GZ_WRITE)
        return NULL;

    /* return error information */
    if (errnum != NULL)
        *errnum = state-&gt;err;
    return state-&gt;err == Z_MEM_ERROR ? &quot;out of memory&quot; :
                                       (state-&gt;msg == NULL ? &quot;&quot; : state-&gt;msg);
}

/* -- see zlib.h -- */
void ZEXPORT gzclearerr(gzFile file) {
    gz_statep state;

    /* get internal structure and check integrity */
    if (file == NULL)
        return;
    state = (gz_statep)file;
    if (state-&gt;mode != GZ_READ &amp;&amp; state-&gt;mode != GZ_WRITE)
        return;

    /* clear error and end-of-file */
    if (state-&gt;mode == GZ_READ) {
        state-&gt;eof = 0;
        state-&gt;past = 0;
    }
    gz_error(state, Z_OK, NULL);
}

/* Create an error message in allocated memory and set state-&gt;err and
   state-&gt;msg accordingly.  Free any previous error message already there.  Do
   not try to free or allocate space if the error is Z_MEM_ERROR (out of
   memory).  Simply save the error message as a static string.  If there is an
   allocation failure constructing the error message, then convert the error to
   out of memory. */
void ZLIB_INTERNAL gz_error(gz_statep state, int err, const char *msg) {
    /* free previously allocated message and clear */
    if (state-&gt;msg != NULL) {
        if (state-&gt;err != Z_MEM_ERROR)
            free(state-&gt;msg);
        state-&gt;msg = NULL;
    }

    /* if fatal, set state-&gt;x.have to 0 so that the gzgetc() macro fails */
    if (err != Z_OK &amp;&amp; err != Z_BUF_ERROR)
        state-&gt;x.have = 0;

    /* set error code, and if no message, then done */
    state-&gt;err = err;
    if (msg == NULL)
        return;

    /* for an out of memory error, return literal string when requested */
    if (err == Z_MEM_ERROR)
        return;

    /* construct error message with path */
    if ((state-&gt;msg = (char *)malloc(strlen(state-&gt;path) + strlen(msg) + 3)) ==
            NULL) {
        state-&gt;err = Z_MEM_ERROR;
        return;
    }
#if !defined(NO_snprintf) &amp;&amp; !defined(NO_vsnprintf)
    (void)snprintf(state-&gt;msg, strlen(state-&gt;path) + strlen(msg) + 3,
                   &quot;%s%s%s&quot;, state-&gt;path, &quot;: &quot;, msg);
#else
    strcpy(state-&gt;msg, state-&gt;path);
    strcat(state-&gt;msg, &quot;: &quot;);
    strcat(state-&gt;msg, msg);
#endif
}

/* portably return maximum value for an int (when limits.h presumed not
   available) -- we need to do this to cover cases where 2&#039;s complement not
   used, since C standard permits 1&#039;s complement and sign-bit representations,
   otherwise we could just use ((unsigned)-1) &gt;&gt; 1 */
unsigned ZLIB_INTERNAL gz_intmax(void) {
#ifdef INT_MAX
    return INT_MAX;
#else
    unsigned p = 1, q;
    do {
        q = p;
        p &lt;&lt;= 1;
        p++;
    } while (p &gt; q);
    return q &gt;&gt; 1;
#endif
}
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