Chris@43: /* gzread.c -- zlib functions for reading gzip files
Chris@43:  * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 Mark Adler
Chris@43:  * For conditions of distribution and use, see copyright notice in zlib.h
Chris@43:  */
Chris@43: 
Chris@43: #include "gzguts.h"
Chris@43: 
Chris@43: /* Local functions */
Chris@43: local int gz_load OF((gz_statep, unsigned char *, unsigned, unsigned *));
Chris@43: local int gz_avail OF((gz_statep));
Chris@43: local int gz_look OF((gz_statep));
Chris@43: local int gz_decomp OF((gz_statep));
Chris@43: local int gz_fetch OF((gz_statep));
Chris@43: local int gz_skip OF((gz_statep, z_off64_t));
Chris@43: 
Chris@43: /* Use read() to load a buffer -- return -1 on error, otherwise 0.  Read from
Chris@43:    state->fd, and update state->eof, state->err, and state->msg as appropriate.
Chris@43:    This function needs to loop on read(), since read() is not guaranteed to
Chris@43:    read the number of bytes requested, depending on the type of descriptor. */
Chris@43: local int gz_load(state, buf, len, have)
Chris@43:     gz_statep state;
Chris@43:     unsigned char *buf;
Chris@43:     unsigned len;
Chris@43:     unsigned *have;
Chris@43: {
Chris@43:     int ret;
Chris@43: 
Chris@43:     *have = 0;
Chris@43:     do {
Chris@43:         ret = read(state->fd, buf + *have, len - *have);
Chris@43:         if (ret <= 0)
Chris@43:             break;
Chris@43:         *have += ret;
Chris@43:     } while (*have < len);
Chris@43:     if (ret < 0) {
Chris@43:         gz_error(state, Z_ERRNO, zstrerror());
Chris@43:         return -1;
Chris@43:     }
Chris@43:     if (ret == 0)
Chris@43:         state->eof = 1;
Chris@43:     return 0;
Chris@43: }
Chris@43: 
Chris@43: /* Load up input buffer and set eof flag if last data loaded -- return -1 on
Chris@43:    error, 0 otherwise.  Note that the eof flag is set when the end of the input
Chris@43:    file is reached, even though there may be unused data in the buffer.  Once
Chris@43:    that data has been used, no more attempts will be made to read the file.
Chris@43:    If strm->avail_in != 0, then the current data is moved to the beginning of
Chris@43:    the input buffer, and then the remainder of the buffer is loaded with the
Chris@43:    available data from the input file. */
Chris@43: local int gz_avail(state)
Chris@43:     gz_statep state;
Chris@43: {
Chris@43:     unsigned got;
Chris@43:     z_streamp strm = &(state->strm);
Chris@43: 
Chris@43:     if (state->err != Z_OK && state->err != Z_BUF_ERROR)
Chris@43:         return -1;
Chris@43:     if (state->eof == 0) {
Chris@43:         if (strm->avail_in) {       /* copy what's there to the start */
Chris@43:             unsigned char *p = state->in;
Chris@43:             unsigned const char *q = strm->next_in;
Chris@43:             unsigned n = strm->avail_in;
Chris@43:             do {
Chris@43:                 *p++ = *q++;
Chris@43:             } while (--n);
Chris@43:         }
Chris@43:         if (gz_load(state, state->in + strm->avail_in,
Chris@43:                     state->size - strm->avail_in, &got) == -1)
Chris@43:             return -1;
Chris@43:         strm->avail_in += got;
Chris@43:         strm->next_in = state->in;
Chris@43:     }
Chris@43:     return 0;
Chris@43: }
Chris@43: 
Chris@43: /* Look for gzip header, set up for inflate or copy.  state->x.have must be 0.
Chris@43:    If this is the first time in, allocate required memory.  state->how will be
Chris@43:    left unchanged if there is no more input data available, will be set to COPY
Chris@43:    if there is no gzip header and direct copying will be performed, or it will
Chris@43:    be set to GZIP for decompression.  If direct copying, then leftover input
Chris@43:    data from the input buffer will be copied to the output buffer.  In that
Chris@43:    case, all further file reads will be directly to either the output buffer or
Chris@43:    a user buffer.  If decompressing, the inflate state will be initialized.
Chris@43:    gz_look() will return 0 on success or -1 on failure. */
Chris@43: local int gz_look(state)
Chris@43:     gz_statep state;
Chris@43: {
Chris@43:     z_streamp strm = &(state->strm);
Chris@43: 
Chris@43:     /* allocate read buffers and inflate memory */
Chris@43:     if (state->size == 0) {
Chris@43:         /* allocate buffers */
Chris@43:         state->in = (unsigned char *)malloc(state->want);
Chris@43:         state->out = (unsigned char *)malloc(state->want << 1);
Chris@43:         if (state->in == NULL || state->out == NULL) {
Chris@43:             if (state->out != NULL)
Chris@43:                 free(state->out);
Chris@43:             if (state->in != NULL)
Chris@43:                 free(state->in);
Chris@43:             gz_error(state, Z_MEM_ERROR, "out of memory");
Chris@43:             return -1;
Chris@43:         }
Chris@43:         state->size = state->want;
Chris@43: 
Chris@43:         /* allocate inflate memory */
Chris@43:         state->strm.zalloc = Z_NULL;
Chris@43:         state->strm.zfree = Z_NULL;
Chris@43:         state->strm.opaque = Z_NULL;
Chris@43:         state->strm.avail_in = 0;
Chris@43:         state->strm.next_in = Z_NULL;
Chris@43:         if (inflateInit2(&(state->strm), 15 + 16) != Z_OK) {    /* gunzip */
Chris@43:             free(state->out);
Chris@43:             free(state->in);
Chris@43:             state->size = 0;
Chris@43:             gz_error(state, Z_MEM_ERROR, "out of memory");
Chris@43:             return -1;
Chris@43:         }
Chris@43:     }
Chris@43: 
Chris@43:     /* get at least the magic bytes in the input buffer */
Chris@43:     if (strm->avail_in < 2) {
Chris@43:         if (gz_avail(state) == -1)
Chris@43:             return -1;
Chris@43:         if (strm->avail_in == 0)
Chris@43:             return 0;
Chris@43:     }
Chris@43: 
Chris@43:     /* look for gzip magic bytes -- if there, do gzip decoding (note: there is
Chris@43:        a logical dilemma here when considering the case of a partially written
Chris@43:        gzip file, to wit, if a single 31 byte is written, then we cannot tell
Chris@43:        whether this is a single-byte file, or just a partially written gzip
Chris@43:        file -- for here we assume that if a gzip file is being written, then
Chris@43:        the header will be written in a single operation, so that reading a
Chris@43:        single byte is sufficient indication that it is not a gzip file) */
Chris@43:     if (strm->avail_in > 1 &&
Chris@43:             strm->next_in[0] == 31 && strm->next_in[1] == 139) {
Chris@43:         inflateReset(strm);
Chris@43:         state->how = GZIP;
Chris@43:         state->direct = 0;
Chris@43:         return 0;
Chris@43:     }
Chris@43: 
Chris@43:     /* no gzip header -- if we were decoding gzip before, then this is trailing
Chris@43:        garbage.  Ignore the trailing garbage and finish. */
Chris@43:     if (state->direct == 0) {
Chris@43:         strm->avail_in = 0;
Chris@43:         state->eof = 1;
Chris@43:         state->x.have = 0;
Chris@43:         return 0;
Chris@43:     }
Chris@43: 
Chris@43:     /* doing raw i/o, copy any leftover input to output -- this assumes that
Chris@43:        the output buffer is larger than the input buffer, which also assures
Chris@43:        space for gzungetc() */
Chris@43:     state->x.next = state->out;
Chris@43:     if (strm->avail_in) {
Chris@43:         memcpy(state->x.next, strm->next_in, strm->avail_in);
Chris@43:         state->x.have = strm->avail_in;
Chris@43:         strm->avail_in = 0;
Chris@43:     }
Chris@43:     state->how = COPY;
Chris@43:     state->direct = 1;
Chris@43:     return 0;
Chris@43: }
Chris@43: 
Chris@43: /* Decompress from input to the provided next_out and avail_out in the state.
Chris@43:    On return, state->x.have and state->x.next point to the just decompressed
Chris@43:    data.  If the gzip stream completes, state->how is reset to LOOK to look for
Chris@43:    the next gzip stream or raw data, once state->x.have is depleted.  Returns 0
Chris@43:    on success, -1 on failure. */
Chris@43: local int gz_decomp(state)
Chris@43:     gz_statep state;
Chris@43: {
Chris@43:     int ret = Z_OK;
Chris@43:     unsigned had;
Chris@43:     z_streamp strm = &(state->strm);
Chris@43: 
Chris@43:     /* fill output buffer up to end of deflate stream */
Chris@43:     had = strm->avail_out;
Chris@43:     do {
Chris@43:         /* get more input for inflate() */
Chris@43:         if (strm->avail_in == 0 && gz_avail(state) == -1)
Chris@43:             return -1;
Chris@43:         if (strm->avail_in == 0) {
Chris@43:             gz_error(state, Z_BUF_ERROR, "unexpected end of file");
Chris@43:             break;
Chris@43:         }
Chris@43: 
Chris@43:         /* decompress and handle errors */
Chris@43:         ret = inflate(strm, Z_NO_FLUSH);
Chris@43:         if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT) {
Chris@43:             gz_error(state, Z_STREAM_ERROR,
Chris@43:                      "internal error: inflate stream corrupt");
Chris@43:             return -1;
Chris@43:         }
Chris@43:         if (ret == Z_MEM_ERROR) {
Chris@43:             gz_error(state, Z_MEM_ERROR, "out of memory");
Chris@43:             return -1;
Chris@43:         }
Chris@43:         if (ret == Z_DATA_ERROR) {              /* deflate stream invalid */
Chris@43:             gz_error(state, Z_DATA_ERROR,
Chris@43:                      strm->msg == NULL ? "compressed data error" : strm->msg);
Chris@43:             return -1;
Chris@43:         }
Chris@43:     } while (strm->avail_out && ret != Z_STREAM_END);
Chris@43: 
Chris@43:     /* update available output */
Chris@43:     state->x.have = had - strm->avail_out;
Chris@43:     state->x.next = strm->next_out - state->x.have;
Chris@43: 
Chris@43:     /* if the gzip stream completed successfully, look for another */
Chris@43:     if (ret == Z_STREAM_END)
Chris@43:         state->how = LOOK;
Chris@43: 
Chris@43:     /* good decompression */
Chris@43:     return 0;
Chris@43: }
Chris@43: 
Chris@43: /* Fetch data and put it in the output buffer.  Assumes state->x.have is 0.
Chris@43:    Data is either copied from the input file or decompressed from the input
Chris@43:    file depending on state->how.  If state->how is LOOK, then a gzip header is
Chris@43:    looked for to determine whether to copy or decompress.  Returns -1 on error,
Chris@43:    otherwise 0.  gz_fetch() will leave state->how as COPY or GZIP unless the
Chris@43:    end of the input file has been reached and all data has been processed.  */
Chris@43: local int gz_fetch(state)
Chris@43:     gz_statep state;
Chris@43: {
Chris@43:     z_streamp strm = &(state->strm);
Chris@43: 
Chris@43:     do {
Chris@43:         switch(state->how) {
Chris@43:         case LOOK:      /* -> LOOK, COPY (only if never GZIP), or GZIP */
Chris@43:             if (gz_look(state) == -1)
Chris@43:                 return -1;
Chris@43:             if (state->how == LOOK)
Chris@43:                 return 0;
Chris@43:             break;
Chris@43:         case COPY:      /* -> COPY */
Chris@43:             if (gz_load(state, state->out, state->size << 1, &(state->x.have))
Chris@43:                     == -1)
Chris@43:                 return -1;
Chris@43:             state->x.next = state->out;
Chris@43:             return 0;
Chris@43:         case GZIP:      /* -> GZIP or LOOK (if end of gzip stream) */
Chris@43:             strm->avail_out = state->size << 1;
Chris@43:             strm->next_out = state->out;
Chris@43:             if (gz_decomp(state) == -1)
Chris@43:                 return -1;
Chris@43:         }
Chris@43:     } while (state->x.have == 0 && (!state->eof || strm->avail_in));
Chris@43:     return 0;
Chris@43: }
Chris@43: 
Chris@43: /* Skip len uncompressed bytes of output.  Return -1 on error, 0 on success. */
Chris@43: local int gz_skip(state, len)
Chris@43:     gz_statep state;
Chris@43:     z_off64_t len;
Chris@43: {
Chris@43:     unsigned n;
Chris@43: 
Chris@43:     /* skip over len bytes or reach end-of-file, whichever comes first */
Chris@43:     while (len)
Chris@43:         /* skip over whatever is in output buffer */
Chris@43:         if (state->x.have) {
Chris@43:             n = GT_OFF(state->x.have) || (z_off64_t)state->x.have > len ?
Chris@43:                 (unsigned)len : state->x.have;
Chris@43:             state->x.have -= n;
Chris@43:             state->x.next += n;
Chris@43:             state->x.pos += n;
Chris@43:             len -= n;
Chris@43:         }
Chris@43: 
Chris@43:         /* output buffer empty -- return if we're at the end of the input */
Chris@43:         else if (state->eof && state->strm.avail_in == 0)
Chris@43:             break;
Chris@43: 
Chris@43:         /* need more data to skip -- load up output buffer */
Chris@43:         else {
Chris@43:             /* get more output, looking for header if required */
Chris@43:             if (gz_fetch(state) == -1)
Chris@43:                 return -1;
Chris@43:         }
Chris@43:     return 0;
Chris@43: }
Chris@43: 
Chris@43: /* -- see zlib.h -- */
Chris@43: int ZEXPORT gzread(file, buf, len)
Chris@43:     gzFile file;
Chris@43:     voidp buf;
Chris@43:     unsigned len;
Chris@43: {
Chris@43:     unsigned got, n;
Chris@43:     gz_statep state;
Chris@43:     z_streamp strm;
Chris@43: 
Chris@43:     /* get internal structure */
Chris@43:     if (file == NULL)
Chris@43:         return -1;
Chris@43:     state = (gz_statep)file;
Chris@43:     strm = &(state->strm);
Chris@43: 
Chris@43:     /* check that we're reading and that there's no (serious) error */
Chris@43:     if (state->mode != GZ_READ ||
Chris@43:             (state->err != Z_OK && state->err != Z_BUF_ERROR))
Chris@43:         return -1;
Chris@43: 
Chris@43:     /* since an int is returned, make sure len fits in one, otherwise return
Chris@43:        with an error (this avoids the flaw in the interface) */
Chris@43:     if ((int)len < 0) {
Chris@43:         gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
Chris@43:         return -1;
Chris@43:     }
Chris@43: 
Chris@43:     /* if len is zero, avoid unnecessary operations */
Chris@43:     if (len == 0)
Chris@43:         return 0;
Chris@43: 
Chris@43:     /* process a skip request */
Chris@43:     if (state->seek) {
Chris@43:         state->seek = 0;
Chris@43:         if (gz_skip(state, state->skip) == -1)
Chris@43:             return -1;
Chris@43:     }
Chris@43: 
Chris@43:     /* get len bytes to buf, or less than len if at the end */
Chris@43:     got = 0;
Chris@43:     do {
Chris@43:         /* first just try copying data from the output buffer */
Chris@43:         if (state->x.have) {
Chris@43:             n = state->x.have > len ? len : state->x.have;
Chris@43:             memcpy(buf, state->x.next, n);
Chris@43:             state->x.next += n;
Chris@43:             state->x.have -= n;
Chris@43:         }
Chris@43: 
Chris@43:         /* output buffer empty -- return if we're at the end of the input */
Chris@43:         else if (state->eof && strm->avail_in == 0) {
Chris@43:             state->past = 1;        /* tried to read past end */
Chris@43:             break;
Chris@43:         }
Chris@43: 
Chris@43:         /* need output data -- for small len or new stream load up our output
Chris@43:            buffer */
Chris@43:         else if (state->how == LOOK || len < (state->size << 1)) {
Chris@43:             /* get more output, looking for header if required */
Chris@43:             if (gz_fetch(state) == -1)
Chris@43:                 return -1;
Chris@43:             continue;       /* no progress yet -- go back to copy above */
Chris@43:             /* the copy above assures that we will leave with space in the
Chris@43:                output buffer, allowing at least one gzungetc() to succeed */
Chris@43:         }
Chris@43: 
Chris@43:         /* large len -- read directly into user buffer */
Chris@43:         else if (state->how == COPY) {      /* read directly */
Chris@43:             if (gz_load(state, (unsigned char *)buf, len, &n) == -1)
Chris@43:                 return -1;
Chris@43:         }
Chris@43: 
Chris@43:         /* large len -- decompress directly into user buffer */
Chris@43:         else {  /* state->how == GZIP */
Chris@43:             strm->avail_out = len;
Chris@43:             strm->next_out = (unsigned char *)buf;
Chris@43:             if (gz_decomp(state) == -1)
Chris@43:                 return -1;
Chris@43:             n = state->x.have;
Chris@43:             state->x.have = 0;
Chris@43:         }
Chris@43: 
Chris@43:         /* update progress */
Chris@43:         len -= n;
Chris@43:         buf = (char *)buf + n;
Chris@43:         got += n;
Chris@43:         state->x.pos += n;
Chris@43:     } while (len);
Chris@43: 
Chris@43:     /* return number of bytes read into user buffer (will fit in int) */
Chris@43:     return (int)got;
Chris@43: }
Chris@43: 
Chris@43: /* -- see zlib.h -- */
Chris@43: #ifdef Z_PREFIX_SET
Chris@43: #  undef z_gzgetc
Chris@43: #else
Chris@43: #  undef gzgetc
Chris@43: #endif
Chris@43: int ZEXPORT gzgetc(file)
Chris@43:     gzFile file;
Chris@43: {
Chris@43:     int ret;
Chris@43:     unsigned char buf[1];
Chris@43:     gz_statep state;
Chris@43: 
Chris@43:     /* get internal structure */
Chris@43:     if (file == NULL)
Chris@43:         return -1;
Chris@43:     state = (gz_statep)file;
Chris@43: 
Chris@43:     /* check that we're reading and that there's no (serious) error */
Chris@43:     if (state->mode != GZ_READ ||
Chris@43:         (state->err != Z_OK && state->err != Z_BUF_ERROR))
Chris@43:         return -1;
Chris@43: 
Chris@43:     /* try output buffer (no need to check for skip request) */
Chris@43:     if (state->x.have) {
Chris@43:         state->x.have--;
Chris@43:         state->x.pos++;
Chris@43:         return *(state->x.next)++;
Chris@43:     }
Chris@43: 
Chris@43:     /* nothing there -- try gzread() */
Chris@43:     ret = gzread(file, buf, 1);
Chris@43:     return ret < 1 ? -1 : buf[0];
Chris@43: }
Chris@43: 
Chris@43: int ZEXPORT gzgetc_(file)
Chris@43: gzFile file;
Chris@43: {
Chris@43:     return gzgetc(file);
Chris@43: }
Chris@43: 
Chris@43: /* -- see zlib.h -- */
Chris@43: int ZEXPORT gzungetc(c, file)
Chris@43:     int c;
Chris@43:     gzFile file;
Chris@43: {
Chris@43:     gz_statep state;
Chris@43: 
Chris@43:     /* get internal structure */
Chris@43:     if (file == NULL)
Chris@43:         return -1;
Chris@43:     state = (gz_statep)file;
Chris@43: 
Chris@43:     /* check that we're reading and that there's no (serious) error */
Chris@43:     if (state->mode != GZ_READ ||
Chris@43:         (state->err != Z_OK && state->err != Z_BUF_ERROR))
Chris@43:         return -1;
Chris@43: 
Chris@43:     /* process a skip request */
Chris@43:     if (state->seek) {
Chris@43:         state->seek = 0;
Chris@43:         if (gz_skip(state, state->skip) == -1)
Chris@43:             return -1;
Chris@43:     }
Chris@43: 
Chris@43:     /* can't push EOF */
Chris@43:     if (c < 0)
Chris@43:         return -1;
Chris@43: 
Chris@43:     /* if output buffer empty, put byte at end (allows more pushing) */
Chris@43:     if (state->x.have == 0) {
Chris@43:         state->x.have = 1;
Chris@43:         state->x.next = state->out + (state->size << 1) - 1;
Chris@43:         state->x.next[0] = c;
Chris@43:         state->x.pos--;
Chris@43:         state->past = 0;
Chris@43:         return c;
Chris@43:     }
Chris@43: 
Chris@43:     /* if no room, give up (must have already done a gzungetc()) */
Chris@43:     if (state->x.have == (state->size << 1)) {
Chris@43:         gz_error(state, Z_DATA_ERROR, "out of room to push characters");
Chris@43:         return -1;
Chris@43:     }
Chris@43: 
Chris@43:     /* slide output data if needed and insert byte before existing data */
Chris@43:     if (state->x.next == state->out) {
Chris@43:         unsigned char *src = state->out + state->x.have;
Chris@43:         unsigned char *dest = state->out + (state->size << 1);
Chris@43:         while (src > state->out)
Chris@43:             *--dest = *--src;
Chris@43:         state->x.next = dest;
Chris@43:     }
Chris@43:     state->x.have++;
Chris@43:     state->x.next--;
Chris@43:     state->x.next[0] = c;
Chris@43:     state->x.pos--;
Chris@43:     state->past = 0;
Chris@43:     return c;
Chris@43: }
Chris@43: 
Chris@43: /* -- see zlib.h -- */
Chris@43: char * ZEXPORT gzgets(file, buf, len)
Chris@43:     gzFile file;
Chris@43:     char *buf;
Chris@43:     int len;
Chris@43: {
Chris@43:     unsigned left, n;
Chris@43:     char *str;
Chris@43:     unsigned char *eol;
Chris@43:     gz_statep state;
Chris@43: 
Chris@43:     /* check parameters and get internal structure */
Chris@43:     if (file == NULL || buf == NULL || len < 1)
Chris@43:         return NULL;
Chris@43:     state = (gz_statep)file;
Chris@43: 
Chris@43:     /* check that we're reading and that there's no (serious) error */
Chris@43:     if (state->mode != GZ_READ ||
Chris@43:         (state->err != Z_OK && state->err != Z_BUF_ERROR))
Chris@43:         return NULL;
Chris@43: 
Chris@43:     /* process a skip request */
Chris@43:     if (state->seek) {
Chris@43:         state->seek = 0;
Chris@43:         if (gz_skip(state, state->skip) == -1)
Chris@43:             return NULL;
Chris@43:     }
Chris@43: 
Chris@43:     /* copy output bytes up to new line or len - 1, whichever comes first --
Chris@43:        append a terminating zero to the string (we don't check for a zero in
Chris@43:        the contents, let the user worry about that) */
Chris@43:     str = buf;
Chris@43:     left = (unsigned)len - 1;
Chris@43:     if (left) do {
Chris@43:         /* assure that something is in the output buffer */
Chris@43:         if (state->x.have == 0 && gz_fetch(state) == -1)
Chris@43:             return NULL;                /* error */
Chris@43:         if (state->x.have == 0) {       /* end of file */
Chris@43:             state->past = 1;            /* read past end */
Chris@43:             break;                      /* return what we have */
Chris@43:         }
Chris@43: 
Chris@43:         /* look for end-of-line in current output buffer */
Chris@43:         n = state->x.have > left ? left : state->x.have;
Chris@43:         eol = (unsigned char *)memchr(state->x.next, '\n', n);
Chris@43:         if (eol != NULL)
Chris@43:             n = (unsigned)(eol - state->x.next) + 1;
Chris@43: 
Chris@43:         /* copy through end-of-line, or remainder if not found */
Chris@43:         memcpy(buf, state->x.next, n);
Chris@43:         state->x.have -= n;
Chris@43:         state->x.next += n;
Chris@43:         state->x.pos += n;
Chris@43:         left -= n;
Chris@43:         buf += n;
Chris@43:     } while (left && eol == NULL);
Chris@43: 
Chris@43:     /* return terminated string, or if nothing, end of file */
Chris@43:     if (buf == str)
Chris@43:         return NULL;
Chris@43:     buf[0] = 0;
Chris@43:     return str;
Chris@43: }
Chris@43: 
Chris@43: /* -- see zlib.h -- */
Chris@43: int ZEXPORT gzdirect(file)
Chris@43:     gzFile file;
Chris@43: {
Chris@43:     gz_statep state;
Chris@43: 
Chris@43:     /* get internal structure */
Chris@43:     if (file == NULL)
Chris@43:         return 0;
Chris@43:     state = (gz_statep)file;
Chris@43: 
Chris@43:     /* if the state is not known, but we can find out, then do so (this is
Chris@43:        mainly for right after a gzopen() or gzdopen()) */
Chris@43:     if (state->mode == GZ_READ && state->how == LOOK && state->x.have == 0)
Chris@43:         (void)gz_look(state);
Chris@43: 
Chris@43:     /* return 1 if transparent, 0 if processing a gzip stream */
Chris@43:     return state->direct;
Chris@43: }
Chris@43: 
Chris@43: /* -- see zlib.h -- */
Chris@43: int ZEXPORT gzclose_r(file)
Chris@43:     gzFile file;
Chris@43: {
Chris@43:     int ret, err;
Chris@43:     gz_statep state;
Chris@43: 
Chris@43:     /* get internal structure */
Chris@43:     if (file == NULL)
Chris@43:         return Z_STREAM_ERROR;
Chris@43:     state = (gz_statep)file;
Chris@43: 
Chris@43:     /* check that we're reading */
Chris@43:     if (state->mode != GZ_READ)
Chris@43:         return Z_STREAM_ERROR;
Chris@43: 
Chris@43:     /* free memory and close file */
Chris@43:     if (state->size) {
Chris@43:         inflateEnd(&(state->strm));
Chris@43:         free(state->out);
Chris@43:         free(state->in);
Chris@43:     }
Chris@43:     err = state->err == Z_BUF_ERROR ? Z_BUF_ERROR : Z_OK;
Chris@43:     gz_error(state, Z_OK, NULL);
Chris@43:     free(state->path);
Chris@43:     ret = close(state->fd);
Chris@43:     free(state);
Chris@43:     return ret ? Z_ERRNO : err;
Chris@43: }