alpar@9: /* gzread.c -- zlib functions for reading gzip files
alpar@9:  * Copyright (C) 2004, 2005, 2010 Mark Adler
alpar@9:  * For conditions of distribution and use, see copyright notice in zlib.h
alpar@9:  */
alpar@9: 
alpar@9: #include "gzguts.h"
alpar@9: 
alpar@9: /* Local functions */
alpar@9: local int gz_load OF((gz_statep, unsigned char *, unsigned, unsigned *));
alpar@9: local int gz_avail OF((gz_statep));
alpar@9: local int gz_next4 OF((gz_statep, unsigned long *));
alpar@9: local int gz_head OF((gz_statep));
alpar@9: local int gz_decomp OF((gz_statep));
alpar@9: local int gz_make OF((gz_statep));
alpar@9: local int gz_skip OF((gz_statep, z_off64_t));
alpar@9: 
alpar@9: /* Use read() to load a buffer -- return -1 on error, otherwise 0.  Read from
alpar@9:    state->fd, and update state->eof, state->err, and state->msg as appropriate.
alpar@9:    This function needs to loop on read(), since read() is not guaranteed to
alpar@9:    read the number of bytes requested, depending on the type of descriptor. */
alpar@9: local int gz_load(state, buf, len, have)
alpar@9:     gz_statep state;
alpar@9:     unsigned char *buf;
alpar@9:     unsigned len;
alpar@9:     unsigned *have;
alpar@9: {
alpar@9:     int ret;
alpar@9: 
alpar@9:     *have = 0;
alpar@9:     do {
alpar@9:         ret = read(state->fd, buf + *have, len - *have);
alpar@9:         if (ret <= 0)
alpar@9:             break;
alpar@9:         *have += ret;
alpar@9:     } while (*have < len);
alpar@9:     if (ret < 0) {
alpar@9:         gz_error(state, Z_ERRNO, zstrerror());
alpar@9:         return -1;
alpar@9:     }
alpar@9:     if (ret == 0)
alpar@9:         state->eof = 1;
alpar@9:     return 0;
alpar@9: }
alpar@9: 
alpar@9: /* Load up input buffer and set eof flag if last data loaded -- return -1 on
alpar@9:    error, 0 otherwise.  Note that the eof flag is set when the end of the input
alpar@9:    file is reached, even though there may be unused data in the buffer.  Once
alpar@9:    that data has been used, no more attempts will be made to read the file.
alpar@9:    gz_avail() assumes that strm->avail_in == 0. */
alpar@9: local int gz_avail(state)
alpar@9:     gz_statep state;
alpar@9: {
alpar@9:     z_streamp strm = &(state->strm);
alpar@9: 
alpar@9:     if (state->err != Z_OK)
alpar@9:         return -1;
alpar@9:     if (state->eof == 0) {
alpar@9:         if (gz_load(state, state->in, state->size,
alpar@9:                 (unsigned *)&(strm->avail_in)) == -1)
alpar@9:             return -1;
alpar@9:         strm->next_in = state->in;
alpar@9:     }
alpar@9:     return 0;
alpar@9: }
alpar@9: 
alpar@9: /* Get next byte from input, or -1 if end or error. */
alpar@9: #define NEXT() ((strm->avail_in == 0 && gz_avail(state) == -1) ? -1 : \
alpar@9:                 (strm->avail_in == 0 ? -1 : \
alpar@9:                  (strm->avail_in--, *(strm->next_in)++)))
alpar@9: 
alpar@9: /* Get a four-byte little-endian integer and return 0 on success and the value
alpar@9:    in *ret.  Otherwise -1 is returned and *ret is not modified. */
alpar@9: local int gz_next4(state, ret)
alpar@9:     gz_statep state;
alpar@9:     unsigned long *ret;
alpar@9: {
alpar@9:     int ch;
alpar@9:     unsigned long val;
alpar@9:     z_streamp strm = &(state->strm);
alpar@9: 
alpar@9:     val = NEXT();
alpar@9:     val += (unsigned)NEXT() << 8;
alpar@9:     val += (unsigned long)NEXT() << 16;
alpar@9:     ch = NEXT();
alpar@9:     if (ch == -1)
alpar@9:         return -1;
alpar@9:     val += (unsigned long)ch << 24;
alpar@9:     *ret = val;
alpar@9:     return 0;
alpar@9: }
alpar@9: 
alpar@9: /* Look for gzip header, set up for inflate or copy.  state->have must be zero.
alpar@9:    If this is the first time in, allocate required memory.  state->how will be
alpar@9:    left unchanged if there is no more input data available, will be set to COPY
alpar@9:    if there is no gzip header and direct copying will be performed, or it will
alpar@9:    be set to GZIP for decompression, and the gzip header will be skipped so
alpar@9:    that the next available input data is the raw deflate stream.  If direct
alpar@9:    copying, then leftover input data from the input buffer will be copied to
alpar@9:    the output buffer.  In that case, all further file reads will be directly to
alpar@9:    either the output buffer or a user buffer.  If decompressing, the inflate
alpar@9:    state and the check value will be initialized.  gz_head() will return 0 on
alpar@9:    success or -1 on failure.  Failures may include read errors or gzip header
alpar@9:    errors.  */
alpar@9: local int gz_head(state)
alpar@9:     gz_statep state;
alpar@9: {
alpar@9:     z_streamp strm = &(state->strm);
alpar@9:     int flags;
alpar@9:     unsigned len;
alpar@9: 
alpar@9:     /* allocate read buffers and inflate memory */
alpar@9:     if (state->size == 0) {
alpar@9:         /* allocate buffers */
alpar@9:         state->in = malloc(state->want);
alpar@9:         state->out = malloc(state->want << 1);
alpar@9:         if (state->in == NULL || state->out == NULL) {
alpar@9:             if (state->out != NULL)
alpar@9:                 free(state->out);
alpar@9:             if (state->in != NULL)
alpar@9:                 free(state->in);
alpar@9:             gz_error(state, Z_MEM_ERROR, "out of memory");
alpar@9:             return -1;
alpar@9:         }
alpar@9:         state->size = state->want;
alpar@9: 
alpar@9:         /* allocate inflate memory */
alpar@9:         state->strm.zalloc = Z_NULL;
alpar@9:         state->strm.zfree = Z_NULL;
alpar@9:         state->strm.opaque = Z_NULL;
alpar@9:         state->strm.avail_in = 0;
alpar@9:         state->strm.next_in = Z_NULL;
alpar@9:         if (inflateInit2(&(state->strm), -15) != Z_OK) {    /* raw inflate */
alpar@9:             free(state->out);
alpar@9:             free(state->in);
alpar@9:             state->size = 0;
alpar@9:             gz_error(state, Z_MEM_ERROR, "out of memory");
alpar@9:             return -1;
alpar@9:         }
alpar@9:     }
alpar@9: 
alpar@9:     /* get some data in the input buffer */
alpar@9:     if (strm->avail_in == 0) {
alpar@9:         if (gz_avail(state) == -1)
alpar@9:             return -1;
alpar@9:         if (strm->avail_in == 0)
alpar@9:             return 0;
alpar@9:     }
alpar@9: 
alpar@9:     /* look for the gzip magic header bytes 31 and 139 */
alpar@9:     if (strm->next_in[0] == 31) {
alpar@9:         strm->avail_in--;
alpar@9:         strm->next_in++;
alpar@9:         if (strm->avail_in == 0 && gz_avail(state) == -1)
alpar@9:             return -1;
alpar@9:         if (strm->avail_in && strm->next_in[0] == 139) {
alpar@9:             /* we have a gzip header, woo hoo! */
alpar@9:             strm->avail_in--;
alpar@9:             strm->next_in++;
alpar@9: 
alpar@9:             /* skip rest of header */
alpar@9:             if (NEXT() != 8) {      /* compression method */
alpar@9:                 gz_error(state, Z_DATA_ERROR, "unknown compression method");
alpar@9:                 return -1;
alpar@9:             }
alpar@9:             flags = NEXT();
alpar@9:             if (flags & 0xe0) {     /* reserved flag bits */
alpar@9:                 gz_error(state, Z_DATA_ERROR, "unknown header flags set");
alpar@9:                 return -1;
alpar@9:             }
alpar@9:             NEXT();                 /* modification time */
alpar@9:             NEXT();
alpar@9:             NEXT();
alpar@9:             NEXT();
alpar@9:             NEXT();                 /* extra flags */
alpar@9:             NEXT();                 /* operating system */
alpar@9:             if (flags & 4) {        /* extra field */
alpar@9:                 len = (unsigned)NEXT();
alpar@9:                 len += (unsigned)NEXT() << 8;
alpar@9:                 while (len--)
alpar@9:                     if (NEXT() < 0)
alpar@9:                         break;
alpar@9:             }
alpar@9:             if (flags & 8)          /* file name */
alpar@9:                 while (NEXT() > 0)
alpar@9:                     ;
alpar@9:             if (flags & 16)         /* comment */
alpar@9:                 while (NEXT() > 0)
alpar@9:                     ;
alpar@9:             if (flags & 2) {        /* header crc */
alpar@9:                 NEXT();
alpar@9:                 NEXT();
alpar@9:             }
alpar@9:             /* an unexpected end of file is not checked for here -- it will be
alpar@9:                noticed on the first request for uncompressed data */
alpar@9: 
alpar@9:             /* set up for decompression */
alpar@9:             inflateReset(strm);
alpar@9:             strm->adler = crc32(0L, Z_NULL, 0);
alpar@9:             state->how = GZIP;
alpar@9:             state->direct = 0;
alpar@9:             return 0;
alpar@9:         }
alpar@9:         else {
alpar@9:             /* not a gzip file -- save first byte (31) and fall to raw i/o */
alpar@9:             state->out[0] = 31;
alpar@9:             state->have = 1;
alpar@9:         }
alpar@9:     }
alpar@9: 
alpar@9:     /* doing raw i/o, save start of raw data for seeking, copy any leftover
alpar@9:        input to output -- this assumes that the output buffer is larger than
alpar@9:        the input buffer, which also assures space for gzungetc() */
alpar@9:     state->raw = state->pos;
alpar@9:     state->next = state->out;
alpar@9:     if (strm->avail_in) {
alpar@9:         memcpy(state->next + state->have, strm->next_in, strm->avail_in);
alpar@9:         state->have += strm->avail_in;
alpar@9:         strm->avail_in = 0;
alpar@9:     }
alpar@9:     state->how = COPY;
alpar@9:     state->direct = 1;
alpar@9:     return 0;
alpar@9: }
alpar@9: 
alpar@9: /* Decompress from input to the provided next_out and avail_out in the state.
alpar@9:    If the end of the compressed data is reached, then verify the gzip trailer
alpar@9:    check value and length (modulo 2^32).  state->have and state->next are set
alpar@9:    to point to the just decompressed data, and the crc is updated.  If the
alpar@9:    trailer is verified, state->how is reset to LOOK to look for the next gzip
alpar@9:    stream or raw data, once state->have is depleted.  Returns 0 on success, -1
alpar@9:    on failure.  Failures may include invalid compressed data or a failed gzip
alpar@9:    trailer verification. */
alpar@9: local int gz_decomp(state)
alpar@9:     gz_statep state;
alpar@9: {
alpar@9:     int ret;
alpar@9:     unsigned had;
alpar@9:     unsigned long crc, len;
alpar@9:     z_streamp strm = &(state->strm);
alpar@9: 
alpar@9:     /* fill output buffer up to end of deflate stream */
alpar@9:     had = strm->avail_out;
alpar@9:     do {
alpar@9:         /* get more input for inflate() */
alpar@9:         if (strm->avail_in == 0 && gz_avail(state) == -1)
alpar@9:             return -1;
alpar@9:         if (strm->avail_in == 0) {
alpar@9:             gz_error(state, Z_DATA_ERROR, "unexpected end of file");
alpar@9:             return -1;
alpar@9:         }
alpar@9: 
alpar@9:         /* decompress and handle errors */
alpar@9:         ret = inflate(strm, Z_NO_FLUSH);
alpar@9:         if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT) {
alpar@9:             gz_error(state, Z_STREAM_ERROR,
alpar@9:                       "internal error: inflate stream corrupt");
alpar@9:             return -1;
alpar@9:         }
alpar@9:         if (ret == Z_MEM_ERROR) {
alpar@9:             gz_error(state, Z_MEM_ERROR, "out of memory");
alpar@9:             return -1;
alpar@9:         }
alpar@9:         if (ret == Z_DATA_ERROR) {              /* deflate stream invalid */
alpar@9:             gz_error(state, Z_DATA_ERROR,
alpar@9:                       strm->msg == NULL ? "compressed data error" : strm->msg);
alpar@9:             return -1;
alpar@9:         }
alpar@9:     } while (strm->avail_out && ret != Z_STREAM_END);
alpar@9: 
alpar@9:     /* update available output and crc check value */
alpar@9:     state->have = had - strm->avail_out;
alpar@9:     state->next = strm->next_out - state->have;
alpar@9:     strm->adler = crc32(strm->adler, state->next, state->have);
alpar@9: 
alpar@9:     /* check gzip trailer if at end of deflate stream */
alpar@9:     if (ret == Z_STREAM_END) {
alpar@9:         if (gz_next4(state, &crc) == -1 || gz_next4(state, &len) == -1) {
alpar@9:             gz_error(state, Z_DATA_ERROR, "unexpected end of file");
alpar@9:             return -1;
alpar@9:         }
alpar@9:         if (crc != strm->adler) {
alpar@9:             gz_error(state, Z_DATA_ERROR, "incorrect data check");
alpar@9:             return -1;
alpar@9:         }
alpar@9:         if (len != (strm->total_out & 0xffffffffL)) {
alpar@9:             gz_error(state, Z_DATA_ERROR, "incorrect length check");
alpar@9:             return -1;
alpar@9:         }
alpar@9:         state->how = LOOK;      /* ready for next stream, once have is 0 (leave
alpar@9:                                    state->direct unchanged to remember how) */
alpar@9:     }
alpar@9: 
alpar@9:     /* good decompression */
alpar@9:     return 0;
alpar@9: }
alpar@9: 
alpar@9: /* Make data and put in the output buffer.  Assumes that state->have == 0.
alpar@9:    Data is either copied from the input file or decompressed from the input
alpar@9:    file depending on state->how.  If state->how is LOOK, then a gzip header is
alpar@9:    looked for (and skipped if found) to determine wither to copy or decompress.
alpar@9:    Returns -1 on error, otherwise 0.  gz_make() will leave state->have as COPY
alpar@9:    or GZIP unless the end of the input file has been reached and all data has
alpar@9:    been processed.  */
alpar@9: local int gz_make(state)
alpar@9:     gz_statep state;
alpar@9: {
alpar@9:     z_streamp strm = &(state->strm);
alpar@9: 
alpar@9:     if (state->how == LOOK) {           /* look for gzip header */
alpar@9:         if (gz_head(state) == -1)
alpar@9:             return -1;
alpar@9:         if (state->have)                /* got some data from gz_head() */
alpar@9:             return 0;
alpar@9:     }
alpar@9:     if (state->how == COPY) {           /* straight copy */
alpar@9:         if (gz_load(state, state->out, state->size << 1, &(state->have)) == -1)
alpar@9:             return -1;
alpar@9:         state->next = state->out;
alpar@9:     }
alpar@9:     else if (state->how == GZIP) {      /* decompress */
alpar@9:         strm->avail_out = state->size << 1;
alpar@9:         strm->next_out = state->out;
alpar@9:         if (gz_decomp(state) == -1)
alpar@9:             return -1;
alpar@9:     }
alpar@9:     return 0;
alpar@9: }
alpar@9: 
alpar@9: /* Skip len uncompressed bytes of output.  Return -1 on error, 0 on success. */
alpar@9: local int gz_skip(state, len)
alpar@9:     gz_statep state;
alpar@9:     z_off64_t len;
alpar@9: {
alpar@9:     unsigned n;
alpar@9: 
alpar@9:     /* skip over len bytes or reach end-of-file, whichever comes first */
alpar@9:     while (len)
alpar@9:         /* skip over whatever is in output buffer */
alpar@9:         if (state->have) {
alpar@9:             n = GT_OFF(state->have) || (z_off64_t)state->have > len ?
alpar@9:                 (unsigned)len : state->have;
alpar@9:             state->have -= n;
alpar@9:             state->next += n;
alpar@9:             state->pos += n;
alpar@9:             len -= n;
alpar@9:         }
alpar@9: 
alpar@9:         /* output buffer empty -- return if we're at the end of the input */
alpar@9:         else if (state->eof && state->strm.avail_in == 0)
alpar@9:             break;
alpar@9: 
alpar@9:         /* need more data to skip -- load up output buffer */
alpar@9:         else {
alpar@9:             /* get more output, looking for header if required */
alpar@9:             if (gz_make(state) == -1)
alpar@9:                 return -1;
alpar@9:         }
alpar@9:     return 0;
alpar@9: }
alpar@9: 
alpar@9: /* -- see zlib.h -- */
alpar@9: int ZEXPORT gzread(file, buf, len)
alpar@9:     gzFile file;
alpar@9:     voidp buf;
alpar@9:     unsigned len;
alpar@9: {
alpar@9:     unsigned got, n;
alpar@9:     gz_statep state;
alpar@9:     z_streamp strm;
alpar@9: 
alpar@9:     /* get internal structure */
alpar@9:     if (file == NULL)
alpar@9:         return -1;
alpar@9:     state = (gz_statep)file;
alpar@9:     strm = &(state->strm);
alpar@9: 
alpar@9:     /* check that we're reading and that there's no error */
alpar@9:     if (state->mode != GZ_READ || state->err != Z_OK)
alpar@9:         return -1;
alpar@9: 
alpar@9:     /* since an int is returned, make sure len fits in one, otherwise return
alpar@9:        with an error (this avoids the flaw in the interface) */
alpar@9:     if ((int)len < 0) {
alpar@9:         gz_error(state, Z_BUF_ERROR, "requested length does not fit in int");
alpar@9:         return -1;
alpar@9:     }
alpar@9: 
alpar@9:     /* if len is zero, avoid unnecessary operations */
alpar@9:     if (len == 0)
alpar@9:         return 0;
alpar@9: 
alpar@9:     /* process a skip request */
alpar@9:     if (state->seek) {
alpar@9:         state->seek = 0;
alpar@9:         if (gz_skip(state, state->skip) == -1)
alpar@9:             return -1;
alpar@9:     }
alpar@9: 
alpar@9:     /* get len bytes to buf, or less than len if at the end */
alpar@9:     got = 0;
alpar@9:     do {
alpar@9:         /* first just try copying data from the output buffer */
alpar@9:         if (state->have) {
alpar@9:             n = state->have > len ? len : state->have;
alpar@9:             memcpy(buf, state->next, n);
alpar@9:             state->next += n;
alpar@9:             state->have -= n;
alpar@9:         }
alpar@9: 
alpar@9:         /* output buffer empty -- return if we're at the end of the input */
alpar@9:         else if (state->eof && strm->avail_in == 0)
alpar@9:             break;
alpar@9: 
alpar@9:         /* need output data -- for small len or new stream load up our output
alpar@9:            buffer */
alpar@9:         else if (state->how == LOOK || len < (state->size << 1)) {
alpar@9:             /* get more output, looking for header if required */
alpar@9:             if (gz_make(state) == -1)
alpar@9:                 return -1;
alpar@9:             continue;       /* no progress yet -- go back to memcpy() above */
alpar@9:             /* the copy above assures that we will leave with space in the
alpar@9:                output buffer, allowing at least one gzungetc() to succeed */
alpar@9:         }
alpar@9: 
alpar@9:         /* large len -- read directly into user buffer */
alpar@9:         else if (state->how == COPY) {      /* read directly */
alpar@9:             if (gz_load(state, buf, len, &n) == -1)
alpar@9:                 return -1;
alpar@9:         }
alpar@9: 
alpar@9:         /* large len -- decompress directly into user buffer */
alpar@9:         else {  /* state->how == GZIP */
alpar@9:             strm->avail_out = len;
alpar@9:             strm->next_out = buf;
alpar@9:             if (gz_decomp(state) == -1)
alpar@9:                 return -1;
alpar@9:             n = state->have;
alpar@9:             state->have = 0;
alpar@9:         }
alpar@9: 
alpar@9:         /* update progress */
alpar@9:         len -= n;
alpar@9:         buf = (char *)buf + n;
alpar@9:         got += n;
alpar@9:         state->pos += n;
alpar@9:     } while (len);
alpar@9: 
alpar@9:     /* return number of bytes read into user buffer (will fit in int) */
alpar@9:     return (int)got;
alpar@9: }
alpar@9: 
alpar@9: /* -- see zlib.h -- */
alpar@9: int ZEXPORT gzgetc(file)
alpar@9:     gzFile file;
alpar@9: {
alpar@9:     int ret;
alpar@9:     unsigned char buf[1];
alpar@9:     gz_statep state;
alpar@9: 
alpar@9:     /* get internal structure */
alpar@9:     if (file == NULL)
alpar@9:         return -1;
alpar@9:     state = (gz_statep)file;
alpar@9: 
alpar@9:     /* check that we're reading and that there's no error */
alpar@9:     if (state->mode != GZ_READ || state->err != Z_OK)
alpar@9:         return -1;
alpar@9: 
alpar@9:     /* try output buffer (no need to check for skip request) */
alpar@9:     if (state->have) {
alpar@9:         state->have--;
alpar@9:         state->pos++;
alpar@9:         return *(state->next)++;
alpar@9:     }
alpar@9: 
alpar@9:     /* nothing there -- try gzread() */
alpar@9:     ret = gzread(file, buf, 1);
alpar@9:     return ret < 1 ? -1 : buf[0];
alpar@9: }
alpar@9: 
alpar@9: /* -- see zlib.h -- */
alpar@9: int ZEXPORT gzungetc(c, file)
alpar@9:     int c;
alpar@9:     gzFile file;
alpar@9: {
alpar@9:     gz_statep state;
alpar@9: 
alpar@9:     /* get internal structure */
alpar@9:     if (file == NULL)
alpar@9:         return -1;
alpar@9:     state = (gz_statep)file;
alpar@9: 
alpar@9:     /* check that we're reading and that there's no error */
alpar@9:     if (state->mode != GZ_READ || state->err != Z_OK)
alpar@9:         return -1;
alpar@9: 
alpar@9:     /* process a skip request */
alpar@9:     if (state->seek) {
alpar@9:         state->seek = 0;
alpar@9:         if (gz_skip(state, state->skip) == -1)
alpar@9:             return -1;
alpar@9:     }
alpar@9: 
alpar@9:     /* can't push EOF */
alpar@9:     if (c < 0)
alpar@9:         return -1;
alpar@9: 
alpar@9:     /* if output buffer empty, put byte at end (allows more pushing) */
alpar@9:     if (state->have == 0) {
alpar@9:         state->have = 1;
alpar@9:         state->next = state->out + (state->size << 1) - 1;
alpar@9:         state->next[0] = c;
alpar@9:         state->pos--;
alpar@9:         return c;
alpar@9:     }
alpar@9: 
alpar@9:     /* if no room, give up (must have already done a gzungetc()) */
alpar@9:     if (state->have == (state->size << 1)) {
alpar@9:         gz_error(state, Z_BUF_ERROR, "out of room to push characters");
alpar@9:         return -1;
alpar@9:     }
alpar@9: 
alpar@9:     /* slide output data if needed and insert byte before existing data */
alpar@9:     if (state->next == state->out) {
alpar@9:         unsigned char *src = state->out + state->have;
alpar@9:         unsigned char *dest = state->out + (state->size << 1);
alpar@9:         while (src > state->out)
alpar@9:             *--dest = *--src;
alpar@9:         state->next = dest;
alpar@9:     }
alpar@9:     state->have++;
alpar@9:     state->next--;
alpar@9:     state->next[0] = c;
alpar@9:     state->pos--;
alpar@9:     return c;
alpar@9: }
alpar@9: 
alpar@9: /* -- see zlib.h -- */
alpar@9: char * ZEXPORT gzgets(file, buf, len)
alpar@9:     gzFile file;
alpar@9:     char *buf;
alpar@9:     int len;
alpar@9: {
alpar@9:     unsigned left, n;
alpar@9:     char *str;
alpar@9:     unsigned char *eol;
alpar@9:     gz_statep state;
alpar@9: 
alpar@9:     /* check parameters and get internal structure */
alpar@9:     if (file == NULL || buf == NULL || len < 1)
alpar@9:         return NULL;
alpar@9:     state = (gz_statep)file;
alpar@9: 
alpar@9:     /* check that we're reading and that there's no error */
alpar@9:     if (state->mode != GZ_READ || state->err != Z_OK)
alpar@9:         return NULL;
alpar@9: 
alpar@9:     /* process a skip request */
alpar@9:     if (state->seek) {
alpar@9:         state->seek = 0;
alpar@9:         if (gz_skip(state, state->skip) == -1)
alpar@9:             return NULL;
alpar@9:     }
alpar@9: 
alpar@9:     /* copy output bytes up to new line or len - 1, whichever comes first --
alpar@9:        append a terminating zero to the string (we don't check for a zero in
alpar@9:        the contents, let the user worry about that) */
alpar@9:     str = buf;
alpar@9:     left = (unsigned)len - 1;
alpar@9:     if (left) do {
alpar@9:         /* assure that something is in the output buffer */
alpar@9:         if (state->have == 0) {
alpar@9:             if (gz_make(state) == -1)
alpar@9:                 return NULL;            /* error */
alpar@9:             if (state->have == 0) {     /* end of file */
alpar@9:                 if (buf == str)         /* got bupkus */
alpar@9:                     return NULL;
alpar@9:                 break;                  /* got something -- return it */
alpar@9:             }
alpar@9:         }
alpar@9: 
alpar@9:         /* look for end-of-line in current output buffer */
alpar@9:         n = state->have > left ? left : state->have;
alpar@9:         eol = memchr(state->next, '\n', n);
alpar@9:         if (eol != NULL)
alpar@9:             n = (unsigned)(eol - state->next) + 1;
alpar@9: 
alpar@9:         /* copy through end-of-line, or remainder if not found */
alpar@9:         memcpy(buf, state->next, n);
alpar@9:         state->have -= n;
alpar@9:         state->next += n;
alpar@9:         state->pos += n;
alpar@9:         left -= n;
alpar@9:         buf += n;
alpar@9:     } while (left && eol == NULL);
alpar@9: 
alpar@9:     /* found end-of-line or out of space -- terminate string and return it */
alpar@9:     buf[0] = 0;
alpar@9:     return str;
alpar@9: }
alpar@9: 
alpar@9: /* -- see zlib.h -- */
alpar@9: int ZEXPORT gzdirect(file)
alpar@9:     gzFile file;
alpar@9: {
alpar@9:     gz_statep state;
alpar@9: 
alpar@9:     /* get internal structure */
alpar@9:     if (file == NULL)
alpar@9:         return 0;
alpar@9:     state = (gz_statep)file;
alpar@9: 
alpar@9:     /* check that we're reading */
alpar@9:     if (state->mode != GZ_READ)
alpar@9:         return 0;
alpar@9: 
alpar@9:     /* if the state is not known, but we can find out, then do so (this is
alpar@9:        mainly for right after a gzopen() or gzdopen()) */
alpar@9:     if (state->how == LOOK && state->have == 0)
alpar@9:         (void)gz_head(state);
alpar@9: 
alpar@9:     /* return 1 if reading direct, 0 if decompressing a gzip stream */
alpar@9:     return state->direct;
alpar@9: }
alpar@9: 
alpar@9: /* -- see zlib.h -- */
alpar@9: int ZEXPORT gzclose_r(file)
alpar@9:     gzFile file;
alpar@9: {
alpar@9:     int ret;
alpar@9:     gz_statep state;
alpar@9: 
alpar@9:     /* get internal structure */
alpar@9:     if (file == NULL)
alpar@9:         return Z_STREAM_ERROR;
alpar@9:     state = (gz_statep)file;
alpar@9: 
alpar@9:     /* check that we're reading */
alpar@9:     if (state->mode != GZ_READ)
alpar@9:         return Z_STREAM_ERROR;
alpar@9: 
alpar@9:     /* free memory and close file */
alpar@9:     if (state->size) {
alpar@9:         inflateEnd(&(state->strm));
alpar@9:         free(state->out);
alpar@9:         free(state->in);
alpar@9:     }
alpar@9:     gz_error(state, Z_OK, NULL);
alpar@9:     free(state->path);
alpar@9:     ret = close(state->fd);
alpar@9:     free(state);
alpar@9:     return ret ? Z_ERRNO : Z_OK;
alpar@9: }