1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/deps/glpk/src/zlib/gzread.c	Sun Nov 06 20:59:10 2011 +0100
     1.3 @@ -0,0 +1,653 @@
     1.4 +/* gzread.c -- zlib functions for reading gzip files
     1.5 + * Copyright (C) 2004, 2005, 2010 Mark Adler
     1.6 + * For conditions of distribution and use, see copyright notice in zlib.h
     1.7 + */
     1.8 +
     1.9 +#include "gzguts.h"
    1.10 +
    1.11 +/* Local functions */
    1.12 +local int gz_load OF((gz_statep, unsigned char *, unsigned, unsigned *));
    1.13 +local int gz_avail OF((gz_statep));
    1.14 +local int gz_next4 OF((gz_statep, unsigned long *));
    1.15 +local int gz_head OF((gz_statep));
    1.16 +local int gz_decomp OF((gz_statep));
    1.17 +local int gz_make OF((gz_statep));
    1.18 +local int gz_skip OF((gz_statep, z_off64_t));
    1.19 +
    1.20 +/* Use read() to load a buffer -- return -1 on error, otherwise 0.  Read from
    1.21 +   state->fd, and update state->eof, state->err, and state->msg as appropriate.
    1.22 +   This function needs to loop on read(), since read() is not guaranteed to
    1.23 +   read the number of bytes requested, depending on the type of descriptor. */
    1.24 +local int gz_load(state, buf, len, have)
    1.25 +    gz_statep state;
    1.26 +    unsigned char *buf;
    1.27 +    unsigned len;
    1.28 +    unsigned *have;
    1.29 +{
    1.30 +    int ret;
    1.31 +
    1.32 +    *have = 0;
    1.33 +    do {
    1.34 +        ret = read(state->fd, buf + *have, len - *have);
    1.35 +        if (ret <= 0)
    1.36 +            break;
    1.37 +        *have += ret;
    1.38 +    } while (*have < len);
    1.39 +    if (ret < 0) {
    1.40 +        gz_error(state, Z_ERRNO, zstrerror());
    1.41 +        return -1;
    1.42 +    }
    1.43 +    if (ret == 0)
    1.44 +        state->eof = 1;
    1.45 +    return 0;
    1.46 +}
    1.47 +
    1.48 +/* Load up input buffer and set eof flag if last data loaded -- return -1 on
    1.49 +   error, 0 otherwise.  Note that the eof flag is set when the end of the input
    1.50 +   file is reached, even though there may be unused data in the buffer.  Once
    1.51 +   that data has been used, no more attempts will be made to read the file.
    1.52 +   gz_avail() assumes that strm->avail_in == 0. */
    1.53 +local int gz_avail(state)
    1.54 +    gz_statep state;
    1.55 +{
    1.56 +    z_streamp strm = &(state->strm);
    1.57 +
    1.58 +    if (state->err != Z_OK)
    1.59 +        return -1;
    1.60 +    if (state->eof == 0) {
    1.61 +        if (gz_load(state, state->in, state->size,
    1.62 +                (unsigned *)&(strm->avail_in)) == -1)
    1.63 +            return -1;
    1.64 +        strm->next_in = state->in;
    1.65 +    }
    1.66 +    return 0;
    1.67 +}
    1.68 +
    1.69 +/* Get next byte from input, or -1 if end or error. */
    1.70 +#define NEXT() ((strm->avail_in == 0 && gz_avail(state) == -1) ? -1 : \
    1.71 +                (strm->avail_in == 0 ? -1 : \
    1.72 +                 (strm->avail_in--, *(strm->next_in)++)))
    1.73 +
    1.74 +/* Get a four-byte little-endian integer and return 0 on success and the value
    1.75 +   in *ret.  Otherwise -1 is returned and *ret is not modified. */
    1.76 +local int gz_next4(state, ret)
    1.77 +    gz_statep state;
    1.78 +    unsigned long *ret;
    1.79 +{
    1.80 +    int ch;
    1.81 +    unsigned long val;
    1.82 +    z_streamp strm = &(state->strm);
    1.83 +
    1.84 +    val = NEXT();
    1.85 +    val += (unsigned)NEXT() << 8;
    1.86 +    val += (unsigned long)NEXT() << 16;
    1.87 +    ch = NEXT();
    1.88 +    if (ch == -1)
    1.89 +        return -1;
    1.90 +    val += (unsigned long)ch << 24;
    1.91 +    *ret = val;
    1.92 +    return 0;
    1.93 +}
    1.94 +
    1.95 +/* Look for gzip header, set up for inflate or copy.  state->have must be zero.
    1.96 +   If this is the first time in, allocate required memory.  state->how will be
    1.97 +   left unchanged if there is no more input data available, will be set to COPY
    1.98 +   if there is no gzip header and direct copying will be performed, or it will
    1.99 +   be set to GZIP for decompression, and the gzip header will be skipped so
   1.100 +   that the next available input data is the raw deflate stream.  If direct
   1.101 +   copying, then leftover input data from the input buffer will be copied to
   1.102 +   the output buffer.  In that case, all further file reads will be directly to
   1.103 +   either the output buffer or a user buffer.  If decompressing, the inflate
   1.104 +   state and the check value will be initialized.  gz_head() will return 0 on
   1.105 +   success or -1 on failure.  Failures may include read errors or gzip header
   1.106 +   errors.  */
   1.107 +local int gz_head(state)
   1.108 +    gz_statep state;
   1.109 +{
   1.110 +    z_streamp strm = &(state->strm);
   1.111 +    int flags;
   1.112 +    unsigned len;
   1.113 +
   1.114 +    /* allocate read buffers and inflate memory */
   1.115 +    if (state->size == 0) {
   1.116 +        /* allocate buffers */
   1.117 +        state->in = malloc(state->want);
   1.118 +        state->out = malloc(state->want << 1);
   1.119 +        if (state->in == NULL || state->out == NULL) {
   1.120 +            if (state->out != NULL)
   1.121 +                free(state->out);
   1.122 +            if (state->in != NULL)
   1.123 +                free(state->in);
   1.124 +            gz_error(state, Z_MEM_ERROR, "out of memory");
   1.125 +            return -1;
   1.126 +        }
   1.127 +        state->size = state->want;
   1.128 +
   1.129 +        /* allocate inflate memory */
   1.130 +        state->strm.zalloc = Z_NULL;
   1.131 +        state->strm.zfree = Z_NULL;
   1.132 +        state->strm.opaque = Z_NULL;
   1.133 +        state->strm.avail_in = 0;
   1.134 +        state->strm.next_in = Z_NULL;
   1.135 +        if (inflateInit2(&(state->strm), -15) != Z_OK) {    /* raw inflate */
   1.136 +            free(state->out);
   1.137 +            free(state->in);
   1.138 +            state->size = 0;
   1.139 +            gz_error(state, Z_MEM_ERROR, "out of memory");
   1.140 +            return -1;
   1.141 +        }
   1.142 +    }
   1.143 +
   1.144 +    /* get some data in the input buffer */
   1.145 +    if (strm->avail_in == 0) {
   1.146 +        if (gz_avail(state) == -1)
   1.147 +            return -1;
   1.148 +        if (strm->avail_in == 0)
   1.149 +            return 0;
   1.150 +    }
   1.151 +
   1.152 +    /* look for the gzip magic header bytes 31 and 139 */
   1.153 +    if (strm->next_in[0] == 31) {
   1.154 +        strm->avail_in--;
   1.155 +        strm->next_in++;
   1.156 +        if (strm->avail_in == 0 && gz_avail(state) == -1)
   1.157 +            return -1;
   1.158 +        if (strm->avail_in && strm->next_in[0] == 139) {
   1.159 +            /* we have a gzip header, woo hoo! */
   1.160 +            strm->avail_in--;
   1.161 +            strm->next_in++;
   1.162 +
   1.163 +            /* skip rest of header */
   1.164 +            if (NEXT() != 8) {      /* compression method */
   1.165 +                gz_error(state, Z_DATA_ERROR, "unknown compression method");
   1.166 +                return -1;
   1.167 +            }
   1.168 +            flags = NEXT();
   1.169 +            if (flags & 0xe0) {     /* reserved flag bits */
   1.170 +                gz_error(state, Z_DATA_ERROR, "unknown header flags set");
   1.171 +                return -1;
   1.172 +            }
   1.173 +            NEXT();                 /* modification time */
   1.174 +            NEXT();
   1.175 +            NEXT();
   1.176 +            NEXT();
   1.177 +            NEXT();                 /* extra flags */
   1.178 +            NEXT();                 /* operating system */
   1.179 +            if (flags & 4) {        /* extra field */
   1.180 +                len = (unsigned)NEXT();
   1.181 +                len += (unsigned)NEXT() << 8;
   1.182 +                while (len--)
   1.183 +                    if (NEXT() < 0)
   1.184 +                        break;
   1.185 +            }
   1.186 +            if (flags & 8)          /* file name */
   1.187 +                while (NEXT() > 0)
   1.188 +                    ;
   1.189 +            if (flags & 16)         /* comment */
   1.190 +                while (NEXT() > 0)
   1.191 +                    ;
   1.192 +            if (flags & 2) {        /* header crc */
   1.193 +                NEXT();
   1.194 +                NEXT();
   1.195 +            }
   1.196 +            /* an unexpected end of file is not checked for here -- it will be
   1.197 +               noticed on the first request for uncompressed data */
   1.198 +
   1.199 +            /* set up for decompression */
   1.200 +            inflateReset(strm);
   1.201 +            strm->adler = crc32(0L, Z_NULL, 0);
   1.202 +            state->how = GZIP;
   1.203 +            state->direct = 0;
   1.204 +            return 0;
   1.205 +        }
   1.206 +        else {
   1.207 +            /* not a gzip file -- save first byte (31) and fall to raw i/o */
   1.208 +            state->out[0] = 31;
   1.209 +            state->have = 1;
   1.210 +        }
   1.211 +    }
   1.212 +
   1.213 +    /* doing raw i/o, save start of raw data for seeking, copy any leftover
   1.214 +       input to output -- this assumes that the output buffer is larger than
   1.215 +       the input buffer, which also assures space for gzungetc() */
   1.216 +    state->raw = state->pos;
   1.217 +    state->next = state->out;
   1.218 +    if (strm->avail_in) {
   1.219 +        memcpy(state->next + state->have, strm->next_in, strm->avail_in);
   1.220 +        state->have += strm->avail_in;
   1.221 +        strm->avail_in = 0;
   1.222 +    }
   1.223 +    state->how = COPY;
   1.224 +    state->direct = 1;
   1.225 +    return 0;
   1.226 +}
   1.227 +
   1.228 +/* Decompress from input to the provided next_out and avail_out in the state.
   1.229 +   If the end of the compressed data is reached, then verify the gzip trailer
   1.230 +   check value and length (modulo 2^32).  state->have and state->next are set
   1.231 +   to point to the just decompressed data, and the crc is updated.  If the
   1.232 +   trailer is verified, state->how is reset to LOOK to look for the next gzip
   1.233 +   stream or raw data, once state->have is depleted.  Returns 0 on success, -1
   1.234 +   on failure.  Failures may include invalid compressed data or a failed gzip
   1.235 +   trailer verification. */
   1.236 +local int gz_decomp(state)
   1.237 +    gz_statep state;
   1.238 +{
   1.239 +    int ret;
   1.240 +    unsigned had;
   1.241 +    unsigned long crc, len;
   1.242 +    z_streamp strm = &(state->strm);
   1.243 +
   1.244 +    /* fill output buffer up to end of deflate stream */
   1.245 +    had = strm->avail_out;
   1.246 +    do {
   1.247 +        /* get more input for inflate() */
   1.248 +        if (strm->avail_in == 0 && gz_avail(state) == -1)
   1.249 +            return -1;
   1.250 +        if (strm->avail_in == 0) {
   1.251 +            gz_error(state, Z_DATA_ERROR, "unexpected end of file");
   1.252 +            return -1;
   1.253 +        }
   1.254 +
   1.255 +        /* decompress and handle errors */
   1.256 +        ret = inflate(strm, Z_NO_FLUSH);
   1.257 +        if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT) {
   1.258 +            gz_error(state, Z_STREAM_ERROR,
   1.259 +                      "internal error: inflate stream corrupt");
   1.260 +            return -1;
   1.261 +        }
   1.262 +        if (ret == Z_MEM_ERROR) {
   1.263 +            gz_error(state, Z_MEM_ERROR, "out of memory");
   1.264 +            return -1;
   1.265 +        }
   1.266 +        if (ret == Z_DATA_ERROR) {              /* deflate stream invalid */
   1.267 +            gz_error(state, Z_DATA_ERROR,
   1.268 +                      strm->msg == NULL ? "compressed data error" : strm->msg);
   1.269 +            return -1;
   1.270 +        }
   1.271 +    } while (strm->avail_out && ret != Z_STREAM_END);
   1.272 +
   1.273 +    /* update available output and crc check value */
   1.274 +    state->have = had - strm->avail_out;
   1.275 +    state->next = strm->next_out - state->have;
   1.276 +    strm->adler = crc32(strm->adler, state->next, state->have);
   1.277 +
   1.278 +    /* check gzip trailer if at end of deflate stream */
   1.279 +    if (ret == Z_STREAM_END) {
   1.280 +        if (gz_next4(state, &crc) == -1 || gz_next4(state, &len) == -1) {
   1.281 +            gz_error(state, Z_DATA_ERROR, "unexpected end of file");
   1.282 +            return -1;
   1.283 +        }
   1.284 +        if (crc != strm->adler) {
   1.285 +            gz_error(state, Z_DATA_ERROR, "incorrect data check");
   1.286 +            return -1;
   1.287 +        }
   1.288 +        if (len != (strm->total_out & 0xffffffffL)) {
   1.289 +            gz_error(state, Z_DATA_ERROR, "incorrect length check");
   1.290 +            return -1;
   1.291 +        }
   1.292 +        state->how = LOOK;      /* ready for next stream, once have is 0 (leave
   1.293 +                                   state->direct unchanged to remember how) */
   1.294 +    }
   1.295 +
   1.296 +    /* good decompression */
   1.297 +    return 0;
   1.298 +}
   1.299 +
   1.300 +/* Make data and put in the output buffer.  Assumes that state->have == 0.
   1.301 +   Data is either copied from the input file or decompressed from the input
   1.302 +   file depending on state->how.  If state->how is LOOK, then a gzip header is
   1.303 +   looked for (and skipped if found) to determine wither to copy or decompress.
   1.304 +   Returns -1 on error, otherwise 0.  gz_make() will leave state->have as COPY
   1.305 +   or GZIP unless the end of the input file has been reached and all data has
   1.306 +   been processed.  */
   1.307 +local int gz_make(state)
   1.308 +    gz_statep state;
   1.309 +{
   1.310 +    z_streamp strm = &(state->strm);
   1.311 +
   1.312 +    if (state->how == LOOK) {           /* look for gzip header */
   1.313 +        if (gz_head(state) == -1)
   1.314 +            return -1;
   1.315 +        if (state->have)                /* got some data from gz_head() */
   1.316 +            return 0;
   1.317 +    }
   1.318 +    if (state->how == COPY) {           /* straight copy */
   1.319 +        if (gz_load(state, state->out, state->size << 1, &(state->have)) == -1)
   1.320 +            return -1;
   1.321 +        state->next = state->out;
   1.322 +    }
   1.323 +    else if (state->how == GZIP) {      /* decompress */
   1.324 +        strm->avail_out = state->size << 1;
   1.325 +        strm->next_out = state->out;
   1.326 +        if (gz_decomp(state) == -1)
   1.327 +            return -1;
   1.328 +    }
   1.329 +    return 0;
   1.330 +}
   1.331 +
   1.332 +/* Skip len uncompressed bytes of output.  Return -1 on error, 0 on success. */
   1.333 +local int gz_skip(state, len)
   1.334 +    gz_statep state;
   1.335 +    z_off64_t len;
   1.336 +{
   1.337 +    unsigned n;
   1.338 +
   1.339 +    /* skip over len bytes or reach end-of-file, whichever comes first */
   1.340 +    while (len)
   1.341 +        /* skip over whatever is in output buffer */
   1.342 +        if (state->have) {
   1.343 +            n = GT_OFF(state->have) || (z_off64_t)state->have > len ?
   1.344 +                (unsigned)len : state->have;
   1.345 +            state->have -= n;
   1.346 +            state->next += n;
   1.347 +            state->pos += n;
   1.348 +            len -= n;
   1.349 +        }
   1.350 +
   1.351 +        /* output buffer empty -- return if we're at the end of the input */
   1.352 +        else if (state->eof && state->strm.avail_in == 0)
   1.353 +            break;
   1.354 +
   1.355 +        /* need more data to skip -- load up output buffer */
   1.356 +        else {
   1.357 +            /* get more output, looking for header if required */
   1.358 +            if (gz_make(state) == -1)
   1.359 +                return -1;
   1.360 +        }
   1.361 +    return 0;
   1.362 +}
   1.363 +
   1.364 +/* -- see zlib.h -- */
   1.365 +int ZEXPORT gzread(file, buf, len)
   1.366 +    gzFile file;
   1.367 +    voidp buf;
   1.368 +    unsigned len;
   1.369 +{
   1.370 +    unsigned got, n;
   1.371 +    gz_statep state;
   1.372 +    z_streamp strm;
   1.373 +
   1.374 +    /* get internal structure */
   1.375 +    if (file == NULL)
   1.376 +        return -1;
   1.377 +    state = (gz_statep)file;
   1.378 +    strm = &(state->strm);
   1.379 +
   1.380 +    /* check that we're reading and that there's no error */
   1.381 +    if (state->mode != GZ_READ || state->err != Z_OK)
   1.382 +        return -1;
   1.383 +
   1.384 +    /* since an int is returned, make sure len fits in one, otherwise return
   1.385 +       with an error (this avoids the flaw in the interface) */
   1.386 +    if ((int)len < 0) {
   1.387 +        gz_error(state, Z_BUF_ERROR, "requested length does not fit in int");
   1.388 +        return -1;
   1.389 +    }
   1.390 +
   1.391 +    /* if len is zero, avoid unnecessary operations */
   1.392 +    if (len == 0)
   1.393 +        return 0;
   1.394 +
   1.395 +    /* process a skip request */
   1.396 +    if (state->seek) {
   1.397 +        state->seek = 0;
   1.398 +        if (gz_skip(state, state->skip) == -1)
   1.399 +            return -1;
   1.400 +    }
   1.401 +
   1.402 +    /* get len bytes to buf, or less than len if at the end */
   1.403 +    got = 0;
   1.404 +    do {
   1.405 +        /* first just try copying data from the output buffer */
   1.406 +        if (state->have) {
   1.407 +            n = state->have > len ? len : state->have;
   1.408 +            memcpy(buf, state->next, n);
   1.409 +            state->next += n;
   1.410 +            state->have -= n;
   1.411 +        }
   1.412 +
   1.413 +        /* output buffer empty -- return if we're at the end of the input */
   1.414 +        else if (state->eof && strm->avail_in == 0)
   1.415 +            break;
   1.416 +
   1.417 +        /* need output data -- for small len or new stream load up our output
   1.418 +           buffer */
   1.419 +        else if (state->how == LOOK || len < (state->size << 1)) {
   1.420 +            /* get more output, looking for header if required */
   1.421 +            if (gz_make(state) == -1)
   1.422 +                return -1;
   1.423 +            continue;       /* no progress yet -- go back to memcpy() above */
   1.424 +            /* the copy above assures that we will leave with space in the
   1.425 +               output buffer, allowing at least one gzungetc() to succeed */
   1.426 +        }
   1.427 +
   1.428 +        /* large len -- read directly into user buffer */
   1.429 +        else if (state->how == COPY) {      /* read directly */
   1.430 +            if (gz_load(state, buf, len, &n) == -1)
   1.431 +                return -1;
   1.432 +        }
   1.433 +
   1.434 +        /* large len -- decompress directly into user buffer */
   1.435 +        else {  /* state->how == GZIP */
   1.436 +            strm->avail_out = len;
   1.437 +            strm->next_out = buf;
   1.438 +            if (gz_decomp(state) == -1)
   1.439 +                return -1;
   1.440 +            n = state->have;
   1.441 +            state->have = 0;
   1.442 +        }
   1.443 +
   1.444 +        /* update progress */
   1.445 +        len -= n;
   1.446 +        buf = (char *)buf + n;
   1.447 +        got += n;
   1.448 +        state->pos += n;
   1.449 +    } while (len);
   1.450 +
   1.451 +    /* return number of bytes read into user buffer (will fit in int) */
   1.452 +    return (int)got;
   1.453 +}
   1.454 +
   1.455 +/* -- see zlib.h -- */
   1.456 +int ZEXPORT gzgetc(file)
   1.457 +    gzFile file;
   1.458 +{
   1.459 +    int ret;
   1.460 +    unsigned char buf[1];
   1.461 +    gz_statep state;
   1.462 +
   1.463 +    /* get internal structure */
   1.464 +    if (file == NULL)
   1.465 +        return -1;
   1.466 +    state = (gz_statep)file;
   1.467 +
   1.468 +    /* check that we're reading and that there's no error */
   1.469 +    if (state->mode != GZ_READ || state->err != Z_OK)
   1.470 +        return -1;
   1.471 +
   1.472 +    /* try output buffer (no need to check for skip request) */
   1.473 +    if (state->have) {
   1.474 +        state->have--;
   1.475 +        state->pos++;
   1.476 +        return *(state->next)++;
   1.477 +    }
   1.478 +
   1.479 +    /* nothing there -- try gzread() */
   1.480 +    ret = gzread(file, buf, 1);
   1.481 +    return ret < 1 ? -1 : buf[0];
   1.482 +}
   1.483 +
   1.484 +/* -- see zlib.h -- */
   1.485 +int ZEXPORT gzungetc(c, file)
   1.486 +    int c;
   1.487 +    gzFile file;
   1.488 +{
   1.489 +    gz_statep state;
   1.490 +
   1.491 +    /* get internal structure */
   1.492 +    if (file == NULL)
   1.493 +        return -1;
   1.494 +    state = (gz_statep)file;
   1.495 +
   1.496 +    /* check that we're reading and that there's no error */
   1.497 +    if (state->mode != GZ_READ || state->err != Z_OK)
   1.498 +        return -1;
   1.499 +
   1.500 +    /* process a skip request */
   1.501 +    if (state->seek) {
   1.502 +        state->seek = 0;
   1.503 +        if (gz_skip(state, state->skip) == -1)
   1.504 +            return -1;
   1.505 +    }
   1.506 +
   1.507 +    /* can't push EOF */
   1.508 +    if (c < 0)
   1.509 +        return -1;
   1.510 +
   1.511 +    /* if output buffer empty, put byte at end (allows more pushing) */
   1.512 +    if (state->have == 0) {
   1.513 +        state->have = 1;
   1.514 +        state->next = state->out + (state->size << 1) - 1;
   1.515 +        state->next[0] = c;
   1.516 +        state->pos--;
   1.517 +        return c;
   1.518 +    }
   1.519 +
   1.520 +    /* if no room, give up (must have already done a gzungetc()) */
   1.521 +    if (state->have == (state->size << 1)) {
   1.522 +        gz_error(state, Z_BUF_ERROR, "out of room to push characters");
   1.523 +        return -1;
   1.524 +    }
   1.525 +
   1.526 +    /* slide output data if needed and insert byte before existing data */
   1.527 +    if (state->next == state->out) {
   1.528 +        unsigned char *src = state->out + state->have;
   1.529 +        unsigned char *dest = state->out + (state->size << 1);
   1.530 +        while (src > state->out)
   1.531 +            *--dest = *--src;
   1.532 +        state->next = dest;
   1.533 +    }
   1.534 +    state->have++;
   1.535 +    state->next--;
   1.536 +    state->next[0] = c;
   1.537 +    state->pos--;
   1.538 +    return c;
   1.539 +}
   1.540 +
   1.541 +/* -- see zlib.h -- */
   1.542 +char * ZEXPORT gzgets(file, buf, len)
   1.543 +    gzFile file;
   1.544 +    char *buf;
   1.545 +    int len;
   1.546 +{
   1.547 +    unsigned left, n;
   1.548 +    char *str;
   1.549 +    unsigned char *eol;
   1.550 +    gz_statep state;
   1.551 +
   1.552 +    /* check parameters and get internal structure */
   1.553 +    if (file == NULL || buf == NULL || len < 1)
   1.554 +        return NULL;
   1.555 +    state = (gz_statep)file;
   1.556 +
   1.557 +    /* check that we're reading and that there's no error */
   1.558 +    if (state->mode != GZ_READ || state->err != Z_OK)
   1.559 +        return NULL;
   1.560 +
   1.561 +    /* process a skip request */
   1.562 +    if (state->seek) {
   1.563 +        state->seek = 0;
   1.564 +        if (gz_skip(state, state->skip) == -1)
   1.565 +            return NULL;
   1.566 +    }
   1.567 +
   1.568 +    /* copy output bytes up to new line or len - 1, whichever comes first --
   1.569 +       append a terminating zero to the string (we don't check for a zero in
   1.570 +       the contents, let the user worry about that) */
   1.571 +    str = buf;
   1.572 +    left = (unsigned)len - 1;
   1.573 +    if (left) do {
   1.574 +        /* assure that something is in the output buffer */
   1.575 +        if (state->have == 0) {
   1.576 +            if (gz_make(state) == -1)
   1.577 +                return NULL;            /* error */
   1.578 +            if (state->have == 0) {     /* end of file */
   1.579 +                if (buf == str)         /* got bupkus */
   1.580 +                    return NULL;
   1.581 +                break;                  /* got something -- return it */
   1.582 +            }
   1.583 +        }
   1.584 +
   1.585 +        /* look for end-of-line in current output buffer */
   1.586 +        n = state->have > left ? left : state->have;
   1.587 +        eol = memchr(state->next, '\n', n);
   1.588 +        if (eol != NULL)
   1.589 +            n = (unsigned)(eol - state->next) + 1;
   1.590 +
   1.591 +        /* copy through end-of-line, or remainder if not found */
   1.592 +        memcpy(buf, state->next, n);
   1.593 +        state->have -= n;
   1.594 +        state->next += n;
   1.595 +        state->pos += n;
   1.596 +        left -= n;
   1.597 +        buf += n;
   1.598 +    } while (left && eol == NULL);
   1.599 +
   1.600 +    /* found end-of-line or out of space -- terminate string and return it */
   1.601 +    buf[0] = 0;
   1.602 +    return str;
   1.603 +}
   1.604 +
   1.605 +/* -- see zlib.h -- */
   1.606 +int ZEXPORT gzdirect(file)
   1.607 +    gzFile file;
   1.608 +{
   1.609 +    gz_statep state;
   1.610 +
   1.611 +    /* get internal structure */
   1.612 +    if (file == NULL)
   1.613 +        return 0;
   1.614 +    state = (gz_statep)file;
   1.615 +
   1.616 +    /* check that we're reading */
   1.617 +    if (state->mode != GZ_READ)
   1.618 +        return 0;
   1.619 +
   1.620 +    /* if the state is not known, but we can find out, then do so (this is
   1.621 +       mainly for right after a gzopen() or gzdopen()) */
   1.622 +    if (state->how == LOOK && state->have == 0)
   1.623 +        (void)gz_head(state);
   1.624 +
   1.625 +    /* return 1 if reading direct, 0 if decompressing a gzip stream */
   1.626 +    return state->direct;
   1.627 +}
   1.628 +
   1.629 +/* -- see zlib.h -- */
   1.630 +int ZEXPORT gzclose_r(file)
   1.631 +    gzFile file;
   1.632 +{
   1.633 +    int ret;
   1.634 +    gz_statep state;
   1.635 +
   1.636 +    /* get internal structure */
   1.637 +    if (file == NULL)
   1.638 +        return Z_STREAM_ERROR;
   1.639 +    state = (gz_statep)file;
   1.640 +
   1.641 +    /* check that we're reading */
   1.642 +    if (state->mode != GZ_READ)
   1.643 +        return Z_STREAM_ERROR;
   1.644 +
   1.645 +    /* free memory and close file */
   1.646 +    if (state->size) {
   1.647 +        inflateEnd(&(state->strm));
   1.648 +        free(state->out);
   1.649 +        free(state->in);
   1.650 +    }
   1.651 +    gz_error(state, Z_OK, NULL);
   1.652 +    free(state->path);
   1.653 +    ret = close(state->fd);
   1.654 +    free(state);
   1.655 +    return ret ? Z_ERRNO : Z_OK;
   1.656 +}