michael@0: /* gzread.c -- zlib functions for reading gzip files
michael@0:  * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 Mark Adler
michael@0:  * For conditions of distribution and use, see copyright notice in zlib.h
michael@0:  */
michael@0: 
michael@0: #include "gzguts.h"
michael@0: 
michael@0: /* Local functions */
michael@0: local int gz_load OF((gz_statep, unsigned char *, unsigned, unsigned *));
michael@0: local int gz_avail OF((gz_statep));
michael@0: local int gz_look OF((gz_statep));
michael@0: local int gz_decomp OF((gz_statep));
michael@0: local int gz_fetch OF((gz_statep));
michael@0: local int gz_skip OF((gz_statep, z_off64_t));
michael@0: 
michael@0: /* Use read() to load a buffer -- return -1 on error, otherwise 0.  Read from
michael@0:    state->fd, and update state->eof, state->err, and state->msg as appropriate.
michael@0:    This function needs to loop on read(), since read() is not guaranteed to
michael@0:    read the number of bytes requested, depending on the type of descriptor. */
michael@0: local int gz_load(state, buf, len, have)
michael@0:     gz_statep state;
michael@0:     unsigned char *buf;
michael@0:     unsigned len;
michael@0:     unsigned *have;
michael@0: {
michael@0:     int ret;
michael@0: 
michael@0:     *have = 0;
michael@0:     do {
michael@0:         ret = read(state->fd, buf + *have, len - *have);
michael@0:         if (ret <= 0)
michael@0:             break;
michael@0:         *have += ret;
michael@0:     } while (*have < len);
michael@0:     if (ret < 0) {
michael@0:         gz_error(state, Z_ERRNO, zstrerror());
michael@0:         return -1;
michael@0:     }
michael@0:     if (ret == 0)
michael@0:         state->eof = 1;
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: /* Load up input buffer and set eof flag if last data loaded -- return -1 on
michael@0:    error, 0 otherwise.  Note that the eof flag is set when the end of the input
michael@0:    file is reached, even though there may be unused data in the buffer.  Once
michael@0:    that data has been used, no more attempts will be made to read the file.
michael@0:    If strm->avail_in != 0, then the current data is moved to the beginning of
michael@0:    the input buffer, and then the remainder of the buffer is loaded with the
michael@0:    available data from the input file. */
michael@0: local int gz_avail(state)
michael@0:     gz_statep state;
michael@0: {
michael@0:     unsigned got;
michael@0:     z_streamp strm = &(state->strm);
michael@0: 
michael@0:     if (state->err != Z_OK && state->err != Z_BUF_ERROR)
michael@0:         return -1;
michael@0:     if (state->eof == 0) {
michael@0:         if (strm->avail_in) {       /* copy what's there to the start */
michael@0:             unsigned char *p = state->in;
michael@0:             unsigned const char *q = strm->next_in;
michael@0:             unsigned n = strm->avail_in;
michael@0:             do {
michael@0:                 *p++ = *q++;
michael@0:             } while (--n);
michael@0:         }
michael@0:         if (gz_load(state, state->in + strm->avail_in,
michael@0:                     state->size - strm->avail_in, &got) == -1)
michael@0:             return -1;
michael@0:         strm->avail_in += got;
michael@0:         strm->next_in = state->in;
michael@0:     }
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: /* Look for gzip header, set up for inflate or copy.  state->x.have must be 0.
michael@0:    If this is the first time in, allocate required memory.  state->how will be
michael@0:    left unchanged if there is no more input data available, will be set to COPY
michael@0:    if there is no gzip header and direct copying will be performed, or it will
michael@0:    be set to GZIP for decompression.  If direct copying, then leftover input
michael@0:    data from the input buffer will be copied to the output buffer.  In that
michael@0:    case, all further file reads will be directly to either the output buffer or
michael@0:    a user buffer.  If decompressing, the inflate state will be initialized.
michael@0:    gz_look() will return 0 on success or -1 on failure. */
michael@0: local int gz_look(state)
michael@0:     gz_statep state;
michael@0: {
michael@0:     z_streamp strm = &(state->strm);
michael@0: 
michael@0:     /* allocate read buffers and inflate memory */
michael@0:     if (state->size == 0) {
michael@0:         /* allocate buffers */
michael@0:         state->in = (unsigned char *)malloc(state->want);
michael@0:         state->out = (unsigned char *)malloc(state->want << 1);
michael@0:         if (state->in == NULL || state->out == NULL) {
michael@0:             if (state->out != NULL)
michael@0:                 free(state->out);
michael@0:             if (state->in != NULL)
michael@0:                 free(state->in);
michael@0:             gz_error(state, Z_MEM_ERROR, "out of memory");
michael@0:             return -1;
michael@0:         }
michael@0:         state->size = state->want;
michael@0: 
michael@0:         /* allocate inflate memory */
michael@0:         state->strm.zalloc = Z_NULL;
michael@0:         state->strm.zfree = Z_NULL;
michael@0:         state->strm.opaque = Z_NULL;
michael@0:         state->strm.avail_in = 0;
michael@0:         state->strm.next_in = Z_NULL;
michael@0:         if (inflateInit2(&(state->strm), 15 + 16) != Z_OK) {    /* gunzip */
michael@0:             free(state->out);
michael@0:             free(state->in);
michael@0:             state->size = 0;
michael@0:             gz_error(state, Z_MEM_ERROR, "out of memory");
michael@0:             return -1;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     /* get at least the magic bytes in the input buffer */
michael@0:     if (strm->avail_in < 2) {
michael@0:         if (gz_avail(state) == -1)
michael@0:             return -1;
michael@0:         if (strm->avail_in == 0)
michael@0:             return 0;
michael@0:     }
michael@0: 
michael@0:     /* look for gzip magic bytes -- if there, do gzip decoding (note: there is
michael@0:        a logical dilemma here when considering the case of a partially written
michael@0:        gzip file, to wit, if a single 31 byte is written, then we cannot tell
michael@0:        whether this is a single-byte file, or just a partially written gzip
michael@0:        file -- for here we assume that if a gzip file is being written, then
michael@0:        the header will be written in a single operation, so that reading a
michael@0:        single byte is sufficient indication that it is not a gzip file) */
michael@0:     if (strm->avail_in > 1 &&
michael@0:             strm->next_in[0] == 31 && strm->next_in[1] == 139) {
michael@0:         inflateReset(strm);
michael@0:         state->how = GZIP;
michael@0:         state->direct = 0;
michael@0:         return 0;
michael@0:     }
michael@0: 
michael@0:     /* no gzip header -- if we were decoding gzip before, then this is trailing
michael@0:        garbage.  Ignore the trailing garbage and finish. */
michael@0:     if (state->direct == 0) {
michael@0:         strm->avail_in = 0;
michael@0:         state->eof = 1;
michael@0:         state->x.have = 0;
michael@0:         return 0;
michael@0:     }
michael@0: 
michael@0:     /* doing raw i/o, copy any leftover input to output -- this assumes that
michael@0:        the output buffer is larger than the input buffer, which also assures
michael@0:        space for gzungetc() */
michael@0:     state->x.next = state->out;
michael@0:     if (strm->avail_in) {
michael@0:         memcpy(state->x.next, strm->next_in, strm->avail_in);
michael@0:         state->x.have = strm->avail_in;
michael@0:         strm->avail_in = 0;
michael@0:     }
michael@0:     state->how = COPY;
michael@0:     state->direct = 1;
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: /* Decompress from input to the provided next_out and avail_out in the state.
michael@0:    On return, state->x.have and state->x.next point to the just decompressed
michael@0:    data.  If the gzip stream completes, state->how is reset to LOOK to look for
michael@0:    the next gzip stream or raw data, once state->x.have is depleted.  Returns 0
michael@0:    on success, -1 on failure. */
michael@0: local int gz_decomp(state)
michael@0:     gz_statep state;
michael@0: {
michael@0:     int ret = Z_OK;
michael@0:     unsigned had;
michael@0:     z_streamp strm = &(state->strm);
michael@0: 
michael@0:     /* fill output buffer up to end of deflate stream */
michael@0:     had = strm->avail_out;
michael@0:     do {
michael@0:         /* get more input for inflate() */
michael@0:         if (strm->avail_in == 0 && gz_avail(state) == -1)
michael@0:             return -1;
michael@0:         if (strm->avail_in == 0) {
michael@0:             gz_error(state, Z_BUF_ERROR, "unexpected end of file");
michael@0:             break;
michael@0:         }
michael@0: 
michael@0:         /* decompress and handle errors */
michael@0:         ret = inflate(strm, Z_NO_FLUSH);
michael@0:         if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT) {
michael@0:             gz_error(state, Z_STREAM_ERROR,
michael@0:                      "internal error: inflate stream corrupt");
michael@0:             return -1;
michael@0:         }
michael@0:         if (ret == Z_MEM_ERROR) {
michael@0:             gz_error(state, Z_MEM_ERROR, "out of memory");
michael@0:             return -1;
michael@0:         }
michael@0:         if (ret == Z_DATA_ERROR) {              /* deflate stream invalid */
michael@0:             gz_error(state, Z_DATA_ERROR,
michael@0:                      strm->msg == NULL ? "compressed data error" : strm->msg);
michael@0:             return -1;
michael@0:         }
michael@0:     } while (strm->avail_out && ret != Z_STREAM_END);
michael@0: 
michael@0:     /* update available output */
michael@0:     state->x.have = had - strm->avail_out;
michael@0:     state->x.next = strm->next_out - state->x.have;
michael@0: 
michael@0:     /* if the gzip stream completed successfully, look for another */
michael@0:     if (ret == Z_STREAM_END)
michael@0:         state->how = LOOK;
michael@0: 
michael@0:     /* good decompression */
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: /* Fetch data and put it in the output buffer.  Assumes state->x.have is 0.
michael@0:    Data is either copied from the input file or decompressed from the input
michael@0:    file depending on state->how.  If state->how is LOOK, then a gzip header is
michael@0:    looked for to determine whether to copy or decompress.  Returns -1 on error,
michael@0:    otherwise 0.  gz_fetch() will leave state->how as COPY or GZIP unless the
michael@0:    end of the input file has been reached and all data has been processed.  */
michael@0: local int gz_fetch(state)
michael@0:     gz_statep state;
michael@0: {
michael@0:     z_streamp strm = &(state->strm);
michael@0: 
michael@0:     do {
michael@0:         switch(state->how) {
michael@0:         case LOOK:      /* -> LOOK, COPY (only if never GZIP), or GZIP */
michael@0:             if (gz_look(state) == -1)
michael@0:                 return -1;
michael@0:             if (state->how == LOOK)
michael@0:                 return 0;
michael@0:             break;
michael@0:         case COPY:      /* -> COPY */
michael@0:             if (gz_load(state, state->out, state->size << 1, &(state->x.have))
michael@0:                     == -1)
michael@0:                 return -1;
michael@0:             state->x.next = state->out;
michael@0:             return 0;
michael@0:         case GZIP:      /* -> GZIP or LOOK (if end of gzip stream) */
michael@0:             strm->avail_out = state->size << 1;
michael@0:             strm->next_out = state->out;
michael@0:             if (gz_decomp(state) == -1)
michael@0:                 return -1;
michael@0:         }
michael@0:     } while (state->x.have == 0 && (!state->eof || strm->avail_in));
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: /* Skip len uncompressed bytes of output.  Return -1 on error, 0 on success. */
michael@0: local int gz_skip(state, len)
michael@0:     gz_statep state;
michael@0:     z_off64_t len;
michael@0: {
michael@0:     unsigned n;
michael@0: 
michael@0:     /* skip over len bytes or reach end-of-file, whichever comes first */
michael@0:     while (len)
michael@0:         /* skip over whatever is in output buffer */
michael@0:         if (state->x.have) {
michael@0:             n = GT_OFF(state->x.have) || (z_off64_t)state->x.have > len ?
michael@0:                 (unsigned)len : state->x.have;
michael@0:             state->x.have -= n;
michael@0:             state->x.next += n;
michael@0:             state->x.pos += n;
michael@0:             len -= n;
michael@0:         }
michael@0: 
michael@0:         /* output buffer empty -- return if we're at the end of the input */
michael@0:         else if (state->eof && state->strm.avail_in == 0)
michael@0:             break;
michael@0: 
michael@0:         /* need more data to skip -- load up output buffer */
michael@0:         else {
michael@0:             /* get more output, looking for header if required */
michael@0:             if (gz_fetch(state) == -1)
michael@0:                 return -1;
michael@0:         }
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: /* -- see zlib.h -- */
michael@0: int ZEXPORT gzread(file, buf, len)
michael@0:     gzFile file;
michael@0:     voidp buf;
michael@0:     unsigned len;
michael@0: {
michael@0:     unsigned got, n;
michael@0:     gz_statep state;
michael@0:     z_streamp strm;
michael@0: 
michael@0:     /* get internal structure */
michael@0:     if (file == NULL)
michael@0:         return -1;
michael@0:     state = (gz_statep)file;
michael@0:     strm = &(state->strm);
michael@0: 
michael@0:     /* check that we're reading and that there's no (serious) error */
michael@0:     if (state->mode != GZ_READ ||
michael@0:             (state->err != Z_OK && state->err != Z_BUF_ERROR))
michael@0:         return -1;
michael@0: 
michael@0:     /* since an int is returned, make sure len fits in one, otherwise return
michael@0:        with an error (this avoids the flaw in the interface) */
michael@0:     if ((int)len < 0) {
michael@0:         gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
michael@0:         return -1;
michael@0:     }
michael@0: 
michael@0:     /* if len is zero, avoid unnecessary operations */
michael@0:     if (len == 0)
michael@0:         return 0;
michael@0: 
michael@0:     /* process a skip request */
michael@0:     if (state->seek) {
michael@0:         state->seek = 0;
michael@0:         if (gz_skip(state, state->skip) == -1)
michael@0:             return -1;
michael@0:     }
michael@0: 
michael@0:     /* get len bytes to buf, or less than len if at the end */
michael@0:     got = 0;
michael@0:     do {
michael@0:         /* first just try copying data from the output buffer */
michael@0:         if (state->x.have) {
michael@0:             n = state->x.have > len ? len : state->x.have;
michael@0:             memcpy(buf, state->x.next, n);
michael@0:             state->x.next += n;
michael@0:             state->x.have -= n;
michael@0:         }
michael@0: 
michael@0:         /* output buffer empty -- return if we're at the end of the input */
michael@0:         else if (state->eof && strm->avail_in == 0) {
michael@0:             state->past = 1;        /* tried to read past end */
michael@0:             break;
michael@0:         }
michael@0: 
michael@0:         /* need output data -- for small len or new stream load up our output
michael@0:            buffer */
michael@0:         else if (state->how == LOOK || len < (state->size << 1)) {
michael@0:             /* get more output, looking for header if required */
michael@0:             if (gz_fetch(state) == -1)
michael@0:                 return -1;
michael@0:             continue;       /* no progress yet -- go back to copy above */
michael@0:             /* the copy above assures that we will leave with space in the
michael@0:                output buffer, allowing at least one gzungetc() to succeed */
michael@0:         }
michael@0: 
michael@0:         /* large len -- read directly into user buffer */
michael@0:         else if (state->how == COPY) {      /* read directly */
michael@0:             if (gz_load(state, (unsigned char *)buf, len, &n) == -1)
michael@0:                 return -1;
michael@0:         }
michael@0: 
michael@0:         /* large len -- decompress directly into user buffer */
michael@0:         else {  /* state->how == GZIP */
michael@0:             strm->avail_out = len;
michael@0:             strm->next_out = (unsigned char *)buf;
michael@0:             if (gz_decomp(state) == -1)
michael@0:                 return -1;
michael@0:             n = state->x.have;
michael@0:             state->x.have = 0;
michael@0:         }
michael@0: 
michael@0:         /* update progress */
michael@0:         len -= n;
michael@0:         buf = (char *)buf + n;
michael@0:         got += n;
michael@0:         state->x.pos += n;
michael@0:     } while (len);
michael@0: 
michael@0:     /* return number of bytes read into user buffer (will fit in int) */
michael@0:     return (int)got;
michael@0: }
michael@0: 
michael@0: /* -- see zlib.h -- */
michael@0: #ifdef Z_PREFIX_SET
michael@0: #  undef z_gzgetc
michael@0: #else
michael@0: #  undef gzgetc
michael@0: #endif
michael@0: int ZEXPORT gzgetc(file)
michael@0:     gzFile file;
michael@0: {
michael@0:     int ret;
michael@0:     unsigned char buf[1];
michael@0:     gz_statep state;
michael@0: 
michael@0:     /* get internal structure */
michael@0:     if (file == NULL)
michael@0:         return -1;
michael@0:     state = (gz_statep)file;
michael@0: 
michael@0:     /* check that we're reading and that there's no (serious) error */
michael@0:     if (state->mode != GZ_READ ||
michael@0:         (state->err != Z_OK && state->err != Z_BUF_ERROR))
michael@0:         return -1;
michael@0: 
michael@0:     /* try output buffer (no need to check for skip request) */
michael@0:     if (state->x.have) {
michael@0:         state->x.have--;
michael@0:         state->x.pos++;
michael@0:         return *(state->x.next)++;
michael@0:     }
michael@0: 
michael@0:     /* nothing there -- try gzread() */
michael@0:     ret = gzread(file, buf, 1);
michael@0:     return ret < 1 ? -1 : buf[0];
michael@0: }
michael@0: 
michael@0: int ZEXPORT gzgetc_(file)
michael@0: gzFile file;
michael@0: {
michael@0:     return gzgetc(file);
michael@0: }
michael@0: 
michael@0: /* -- see zlib.h -- */
michael@0: int ZEXPORT gzungetc(c, file)
michael@0:     int c;
michael@0:     gzFile file;
michael@0: {
michael@0:     gz_statep state;
michael@0: 
michael@0:     /* get internal structure */
michael@0:     if (file == NULL)
michael@0:         return -1;
michael@0:     state = (gz_statep)file;
michael@0: 
michael@0:     /* check that we're reading and that there's no (serious) error */
michael@0:     if (state->mode != GZ_READ ||
michael@0:         (state->err != Z_OK && state->err != Z_BUF_ERROR))
michael@0:         return -1;
michael@0: 
michael@0:     /* process a skip request */
michael@0:     if (state->seek) {
michael@0:         state->seek = 0;
michael@0:         if (gz_skip(state, state->skip) == -1)
michael@0:             return -1;
michael@0:     }
michael@0: 
michael@0:     /* can't push EOF */
michael@0:     if (c < 0)
michael@0:         return -1;
michael@0: 
michael@0:     /* if output buffer empty, put byte at end (allows more pushing) */
michael@0:     if (state->x.have == 0) {
michael@0:         state->x.have = 1;
michael@0:         state->x.next = state->out + (state->size << 1) - 1;
michael@0:         state->x.next[0] = c;
michael@0:         state->x.pos--;
michael@0:         state->past = 0;
michael@0:         return c;
michael@0:     }
michael@0: 
michael@0:     /* if no room, give up (must have already done a gzungetc()) */
michael@0:     if (state->x.have == (state->size << 1)) {
michael@0:         gz_error(state, Z_DATA_ERROR, "out of room to push characters");
michael@0:         return -1;
michael@0:     }
michael@0: 
michael@0:     /* slide output data if needed and insert byte before existing data */
michael@0:     if (state->x.next == state->out) {
michael@0:         unsigned char *src = state->out + state->x.have;
michael@0:         unsigned char *dest = state->out + (state->size << 1);
michael@0:         while (src > state->out)
michael@0:             *--dest = *--src;
michael@0:         state->x.next = dest;
michael@0:     }
michael@0:     state->x.have++;
michael@0:     state->x.next--;
michael@0:     state->x.next[0] = c;
michael@0:     state->x.pos--;
michael@0:     state->past = 0;
michael@0:     return c;
michael@0: }
michael@0: 
michael@0: /* -- see zlib.h -- */
michael@0: char * ZEXPORT gzgets(file, buf, len)
michael@0:     gzFile file;
michael@0:     char *buf;
michael@0:     int len;
michael@0: {
michael@0:     unsigned left, n;
michael@0:     char *str;
michael@0:     unsigned char *eol;
michael@0:     gz_statep state;
michael@0: 
michael@0:     /* check parameters and get internal structure */
michael@0:     if (file == NULL || buf == NULL || len < 1)
michael@0:         return NULL;
michael@0:     state = (gz_statep)file;
michael@0: 
michael@0:     /* check that we're reading and that there's no (serious) error */
michael@0:     if (state->mode != GZ_READ ||
michael@0:         (state->err != Z_OK && state->err != Z_BUF_ERROR))
michael@0:         return NULL;
michael@0: 
michael@0:     /* process a skip request */
michael@0:     if (state->seek) {
michael@0:         state->seek = 0;
michael@0:         if (gz_skip(state, state->skip) == -1)
michael@0:             return NULL;
michael@0:     }
michael@0: 
michael@0:     /* copy output bytes up to new line or len - 1, whichever comes first --
michael@0:        append a terminating zero to the string (we don't check for a zero in
michael@0:        the contents, let the user worry about that) */
michael@0:     str = buf;
michael@0:     left = (unsigned)len - 1;
michael@0:     if (left) do {
michael@0:         /* assure that something is in the output buffer */
michael@0:         if (state->x.have == 0 && gz_fetch(state) == -1)
michael@0:             return NULL;                /* error */
michael@0:         if (state->x.have == 0) {       /* end of file */
michael@0:             state->past = 1;            /* read past end */
michael@0:             break;                      /* return what we have */
michael@0:         }
michael@0: 
michael@0:         /* look for end-of-line in current output buffer */
michael@0:         n = state->x.have > left ? left : state->x.have;
michael@0:         eol = (unsigned char *)memchr(state->x.next, '\n', n);
michael@0:         if (eol != NULL)
michael@0:             n = (unsigned)(eol - state->x.next) + 1;
michael@0: 
michael@0:         /* copy through end-of-line, or remainder if not found */
michael@0:         memcpy(buf, state->x.next, n);
michael@0:         state->x.have -= n;
michael@0:         state->x.next += n;
michael@0:         state->x.pos += n;
michael@0:         left -= n;
michael@0:         buf += n;
michael@0:     } while (left && eol == NULL);
michael@0: 
michael@0:     /* return terminated string, or if nothing, end of file */
michael@0:     if (buf == str)
michael@0:         return NULL;
michael@0:     buf[0] = 0;
michael@0:     return str;
michael@0: }
michael@0: 
michael@0: /* -- see zlib.h -- */
michael@0: int ZEXPORT gzdirect(file)
michael@0:     gzFile file;
michael@0: {
michael@0:     gz_statep state;
michael@0: 
michael@0:     /* get internal structure */
michael@0:     if (file == NULL)
michael@0:         return 0;
michael@0:     state = (gz_statep)file;
michael@0: 
michael@0:     /* if the state is not known, but we can find out, then do so (this is
michael@0:        mainly for right after a gzopen() or gzdopen()) */
michael@0:     if (state->mode == GZ_READ && state->how == LOOK && state->x.have == 0)
michael@0:         (void)gz_look(state);
michael@0: 
michael@0:     /* return 1 if transparent, 0 if processing a gzip stream */
michael@0:     return state->direct;
michael@0: }
michael@0: 
michael@0: /* -- see zlib.h -- */
michael@0: int ZEXPORT gzclose_r(file)
michael@0:     gzFile file;
michael@0: {
michael@0:     int ret, err;
michael@0:     gz_statep state;
michael@0: 
michael@0:     /* get internal structure */
michael@0:     if (file == NULL)
michael@0:         return Z_STREAM_ERROR;
michael@0:     state = (gz_statep)file;
michael@0: 
michael@0:     /* check that we're reading */
michael@0:     if (state->mode != GZ_READ)
michael@0:         return Z_STREAM_ERROR;
michael@0: 
michael@0:     /* free memory and close file */
michael@0:     if (state->size) {
michael@0:         inflateEnd(&(state->strm));
michael@0:         free(state->out);
michael@0:         free(state->in);
michael@0:     }
michael@0:     err = state->err == Z_BUF_ERROR ? Z_BUF_ERROR : Z_OK;
michael@0:     gz_error(state, Z_OK, NULL);
michael@0:     free(state->path);
michael@0:     ret = close(state->fd);
michael@0:     free(state);
michael@0:     return ret ? Z_ERRNO : err;
michael@0: }