WebSVN – Kolibri OS – Diff – /programs/develop/libraries/zlib/gzread.c

 /* gzread.c -- zlib functions for reading gzip files
- * Copyright (C) 2004, 2005, 2010 Mark Adler
+ * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 #include "gzguts.h"
 /* Local functions */
-local int gz_load OF((gz_statep, unsigned char *, unsigned, unsigned *));
-local int gz_avail OF((gz_statep));
+local int gz_load OF((gz_statep, unsigned char *, unsigned, unsigned *));
-local int gz_next4 OF((gz_statep, unsigned long *));
+local int gz_avail OF((gz_statep));
-local int gz_head OF((gz_statep));
+local int gz_look OF((gz_statep));
 local int gz_decomp OF((gz_statep));
-local int gz_make OF((gz_statep));
+local int gz_fetch OF((gz_statep));
 local int gz_skip OF((gz_statep, z_off64_t));
 /* Load up input buffer and set eof flag if last data loaded -- return -1 on
    error, 0 otherwise.  Note that the eof flag is set when the end of the input
    file is reached, even though there may be unused data in the buffer.  Once
+   that data has been used, no more attempts will be made to read the file.
+   If strm->avail_in != 0, then the current data is moved to the beginning of
-   that data has been used, no more attempts will be made to read the file.
+   the input buffer, and then the remainder of the buffer is loaded with the
-   gz_avail() assumes that strm->avail_in == 0. */
+   available data from the input file. */
 local int gz_avail(state)
     gz_statep state;
+{
     unsigned got;
     z_streamp strm = &(state->strm);
-    if (state->err != Z_OK)
+    if (state->err != Z_OK && state->err != Z_BUF_ERROR)
+        return -1;
+    if (state->eof == 0) {
+        if (strm->avail_in) {       /* copy what's there to the start */
+            unsigned char *p = state->in;
+            unsigned const char *q = strm->next_in;
+            unsigned n = strm->avail_in;
+            do {
+                *p++ = *q++;
-        return -1;
+            } while (--n);
-    if (state->eof == 0) {
+        }
-        if (gz_load(state, state->in, state->size,
+        if (gz_load(state, state->in + strm->avail_in,
+                    state->size - strm->avail_in, &got) == -1)
-                (unsigned *)&(strm->avail_in)) == -1)
+            return -1;
-            return -1;
+        strm->avail_in += got;
         strm->next_in = state->in;
+    }
-    return 0;
-}
-/* Get next byte from input, or -1 if end or error. */
-#define NEXT() ((strm->avail_in == 0 && gz_avail(state) == -1) ? -1 : \
-                (strm->avail_in == 0 ? -1 : \
-                 (strm->avail_in--, *(strm->next_in)++)))
-/* Get a four-byte little-endian integer and return 0 on success and the value
-   in *ret.  Otherwise -1 is returned and *ret is not modified. */
-local int gz_next4(state, ret)
-    gz_statep state;
-    unsigned long *ret;
-{
-    int ch;
-    unsigned long val;
-    z_streamp strm = &(state->strm);
-    val = NEXT();
-    val += (unsigned)NEXT() << 8;
-    val += (unsigned long)NEXT() << 16;
-    ch = NEXT();
-    if (ch == -1)
-        return -1;
-    val += (unsigned long)ch << 24;
-    *ret = val;
     return 0;
+}
-/* Look for gzip header, set up for inflate or copy.  state->have must be zero.
+/* Look for gzip header, set up for inflate or copy.  state->x.have must be 0.
    If this is the first time in, allocate required memory.  state->how will be
    left unchanged if there is no more input data available, will be set to COPY
    if there is no gzip header and direct copying will be performed, or it will
-   be set to GZIP for decompression, and the gzip header will be skipped so
+   be set to GZIP for decompression.  If direct copying, then leftover input
-   that the next available input data is the raw deflate stream.  If direct
-   copying, then leftover input data from the input buffer will be copied to
-   the output buffer.  In that case, all further file reads will be directly to
+   data from the input buffer will be copied to the output buffer.  In that
-   either the output buffer or a user buffer.  If decompressing, the inflate
-   state and the check value will be initialized.  gz_head() will return 0 on
+   case, all further file reads will be directly to either the output buffer or
-   success or -1 on failure.  Failures may include read errors or gzip header
+   a user buffer.  If decompressing, the inflate state will be initialized.
-   errors.  */
+   gz_look() will return 0 on success or -1 on failure. */
-local int gz_head(state)
+local int gz_look(state)
-    gz_statep state;
-{
-    z_streamp strm = &(state->strm);
+    gz_statep state;
     int flags;
-    unsigned len;
+    z_streamp strm = &(state->strm);
     /* allocate read buffers and inflate memory */
     if (state->size == 0) {
         /* allocate buffers */
-        state->in = malloc(state->want);
+        state->in = (unsigned char *)malloc(state->want);
-        state->out = malloc(state->want << 1);
+        state->out = (unsigned char *)malloc(state->want << 1);
         if (state->in == NULL || state->out == NULL) {
         state->strm.zalloc = Z_NULL;
         state->strm.zfree = Z_NULL;
         state->strm.opaque = Z_NULL;
         state->strm.avail_in = 0;
         state->strm.next_in = Z_NULL;
-        if (inflateInit2(&(state->strm), -15) != Z_OK) {    /* raw inflate */
+        if (inflateInit2(&(state->strm), 15 + 16) != Z_OK) {    /* gunzip */
             free(state->out);
             free(state->in);
             state->size = 0;
             gz_error(state, Z_MEM_ERROR, "out of memory");
             return -1;
+        }
+    }
-    /* get some data in the input buffer */
+    /* get at least the magic bytes in the input buffer */
-    if (strm->avail_in == 0) {
+    if (strm->avail_in < 2) {
         if (gz_avail(state) == -1)
             return -1;
         if (strm->avail_in == 0)
             return 0;
     }
-    /* look for the gzip magic header bytes 31 and 139 */
-    if (strm->next_in[0] == 31) {
-        strm->avail_in--;
-        strm->next_in++;
-        if (strm->avail_in == 0 && gz_avail(state) == -1)
-            return -1;
-        if (strm->avail_in && strm->next_in[0] == 139) {
-            /* we have a gzip header, woo hoo! */
-            strm->avail_in--;
-            strm->next_in++;
+    /* look for gzip magic bytes -- if there, do gzip decoding (note: there is
-            /* skip rest of header */
-            if (NEXT() != 8) {      /* compression method */
-                gz_error(state, Z_DATA_ERROR, "unknown compression method");
-                return -1;
-            }
+       a logical dilemma here when considering the case of a partially written
-            flags = NEXT();
-            if (flags & 0xe0) {     /* reserved flag bits */
-                gz_error(state, Z_DATA_ERROR, "unknown header flags set");
-                return -1;
+       gzip file, to wit, if a single 31 byte is written, then we cannot tell
-            }
-            NEXT();                 /* modification time */
-            NEXT();
-            NEXT();
-            NEXT();
+       whether this is a single-byte file, or just a partially written gzip
-            NEXT();                 /* extra flags */
+       file -- for here we assume that if a gzip file is being written, then
-            NEXT();                 /* operating system */
-            if (flags & 4) {        /* extra field */
-                len = (unsigned)NEXT();
+       the header will be written in a single operation, so that reading a
-                len += (unsigned)NEXT() << 8;
-                while (len--)
-                    if (NEXT() < 0)
-                        break;
-            }
-            if (flags & 8)          /* file name */
-                while (NEXT() > 0)
-                    ;
-            if (flags & 16)         /* comment */
-                while (NEXT() > 0)
-                    ;
-            if (flags & 2) {        /* header crc */
-                NEXT();
-                NEXT();
-            }
+       single byte is sufficient indication that it is not a gzip file) */
-            /* an unexpected end of file is not checked for here -- it will be
-               noticed on the first request for uncompressed data */
     if (strm->avail_in > 1 &&
-            /* set up for decompression */
-            inflateReset(strm);
+            strm->next_in[0] == 31 && strm->next_in[1] == 139) {
-            strm->adler = crc32(0L, Z_NULL, 0);
+        inflateReset(strm);
-            state->how = GZIP;
+        state->how = GZIP;
-            state->direct = 0;
+        state->direct = 0;
+        return 0;
+    }
-            return 0;
+    /* no gzip header -- if we were decoding gzip before, then this is trailing
-        }
+       garbage.  Ignore the trailing garbage and finish. */
-        else {
+    if (state->direct == 0) {
-            /* not a gzip file -- save first byte (31) and fall to raw i/o */
+        strm->avail_in = 0;
-            state->out[0] = 31;
+        state->eof = 1;
-            state->have = 1;
+        state->x.have = 0;
-        }
+        return 0;
     }
-    /* doing raw i/o, save start of raw data for seeking, copy any leftover
-       input to output -- this assumes that the output buffer is larger than
+    /* doing raw i/o, copy any leftover input to output -- this assumes that
-       the input buffer, which also assures space for gzungetc() */
+       the output buffer is larger than the input buffer, which also assures
-    state->raw = state->pos;
+       space for gzungetc() */
-    state->next = state->out;
+    state->x.next = state->out;
     if (strm->avail_in) {
-        memcpy(state->next + state->have, strm->next_in, strm->avail_in);
+        memcpy(state->x.next, strm->next_in, strm->avail_in);
-        state->have += strm->avail_in;
+        state->x.have = strm->avail_in;
         strm->avail_in = 0;
+    }
     state->how = COPY;
     state->direct = 1;
-    return 0;
-}
+    return 0;
-/* Decompress from input to the provided next_out and avail_out in the state.
+}
-   If the end of the compressed data is reached, then verify the gzip trailer
-   check value and length (modulo 2^32).  state->have and state->next are set
-   to point to the just decompressed data, and the crc is updated.  If the
+/* Decompress from input to the provided next_out and avail_out in the state.
-   trailer is verified, state->how is reset to LOOK to look for the next gzip
+   On return, state->x.have and state->x.next point to the just decompressed
-   stream or raw data, once state->have is depleted.  Returns 0 on success, -1
+   data.  If the gzip stream completes, state->how is reset to LOOK to look for
-   on failure.  Failures may include invalid compressed data or a failed gzip
+   the next gzip stream or raw data, once state->x.have is depleted.  Returns 0
-   trailer verification. */
+   on success, -1 on failure. */
 local int gz_decomp(state)
-    gz_statep state;
     gz_statep state;
     int ret;
-    unsigned had;
+    int ret = Z_OK;
-    unsigned long crc, len;
+    unsigned had;
     z_streamp strm = &(state->strm);
     /* fill output buffer up to end of deflate stream */
     had = strm->avail_out;
     do {
         /* get more input for inflate() */
         if (strm->avail_in == 0 && gz_avail(state) == -1)
             return -1;
         if (strm->avail_in == 0) {
-            gz_error(state, Z_DATA_ERROR, "unexpected end of file");
+            gz_error(state, Z_BUF_ERROR, "unexpected end of file");
-                      strm->msg == NULL ? "compressed data error" : strm->msg);
+                     strm->msg == NULL ? "compressed data error" : strm->msg);
             return -1;
+        }
     } while (strm->avail_out && ret != Z_STREAM_END);
-    /* update available output and crc check value */
+    /* update available output */
-    state->have = had - strm->avail_out;
+    state->x.have = had - strm->avail_out;
-    state->next = strm->next_out - state->have;
-    strm->adler = crc32(strm->adler, state->next, state->have);
+    state->x.next = strm->next_out - state->x.have;
-    /* check gzip trailer if at end of deflate stream */
+    /* if the gzip stream completed successfully, look for another */
-    if (ret == Z_STREAM_END) {
-        if (gz_next4(state, &crc) == -1 || gz_next4(state, &len) == -1) {
-            gz_error(state, Z_DATA_ERROR, "unexpected end of file");
-            return -1;
-        }
-        if (crc != strm->adler) {
-            gz_error(state, Z_DATA_ERROR, "incorrect data check");
-            return -1;
-        }
-        if (len != (strm->total_out & 0xffffffffL)) {
-            gz_error(state, Z_DATA_ERROR, "incorrect length check");
+    if (ret == Z_STREAM_END)
-            return -1;
-        }
-        state->how = LOOK;      /* ready for next stream, once have is 0 (leave
-                                   state->direct unchanged to remember how) */
         state->how = LOOK;
     /* good decompression */
     return 0;
+}
-/* Make data and put in the output buffer.  Assumes that state->have == 0.
+/* Fetch data and put it in the output buffer.  Assumes state->x.have is 0.
    Data is either copied from the input file or decompressed from the input
    file depending on state->how.  If state->how is LOOK, then a gzip header is
-   looked for (and skipped if found) to determine wither to copy or decompress.
-   Returns -1 on error, otherwise 0.  gz_make() will leave state->have as COPY
+   looked for to determine whether to copy or decompress.  Returns -1 on error,
-   or GZIP unless the end of the input file has been reached and all data has
+   otherwise 0.  gz_fetch() will leave state->how as COPY or GZIP unless the
-   been processed.  */
+   end of the input file has been reached and all data has been processed.  */
-local int gz_make(state)
+local int gz_fetch(state)
+    gz_statep state;
+{
-    gz_statep state;
+    z_streamp strm = &(state->strm);
-{
-    z_streamp strm = &(state->strm);
+    do {
+        switch(state->how) {
-    if (state->how == LOOK) {           /* look for gzip header */
+        case LOOK:      /* -> LOOK, COPY (only if never GZIP), or GZIP */
-        if (gz_head(state) == -1)
+            if (gz_look(state) == -1)
-            return -1;
+                return -1;
-        if (state->have)                /* got some data from gz_head() */
+            if (state->how == LOOK)
+                return 0;
-            return 0;
+            break;
-    }
+        case COPY:      /* -> COPY */
-    if (state->how == COPY) {           /* straight copy */
+            if (gz_load(state, state->out, state->size << 1, &(state->x.have))
-        if (gz_load(state, state->out, state->size << 1, &(state->have)) == -1)
+                    == -1)
-            return -1;
+                return -1;
-        state->next = state->out;
+            state->x.next = state->out;
             return 0;
-    else if (state->how == GZIP) {      /* decompress */
+        case GZIP:      /* -> GZIP or LOOK (if end of gzip stream) */
-        strm->avail_out = state->size << 1;
+            strm->avail_out = state->size << 1;
+            strm->next_out = state->out;
-        strm->next_out = state->out;
+            if (gz_decomp(state) == -1)
-        if (gz_decomp(state) == -1)
+                return -1;
             return -1;
     } while (state->x.have == 0 && (!state->eof || strm->avail_in));
     unsigned n;
     /* skip over len bytes or reach end-of-file, whichever comes first */
     while (len)
         /* skip over whatever is in output buffer */
-        if (state->have) {
+        if (state->x.have) {
-            n = GT_OFF(state->have) || (z_off64_t)state->have > len ?
+            n = GT_OFF(state->x.have) || (z_off64_t)state->x.have > len ?
-                (unsigned)len : state->have;
+                (unsigned)len : state->x.have;
-            state->have -= n;
+            state->x.have -= n;
-            state->next += n;
+            state->x.next += n;
-            state->pos += n;
+            state->x.pos += n;
             len -= n;
+        }
         /* output buffer empty -- return if we're at the end of the input */
         else if (state->eof && state->strm.avail_in == 0)
             break;
         /* need more data to skip -- load up output buffer */
         else {
             /* get more output, looking for header if required */
-            if (gz_make(state) == -1)
+            if (gz_fetch(state) == -1)
                 return -1;
     if (file == NULL)
         return -1;
     state = (gz_statep)file;
     strm = &(state->strm);
-    /* check that we're reading and that there's no error */
+    /* check that we're reading and that there's no (serious) error */
+    if (state->mode != GZ_READ ||
-    if (state->mode != GZ_READ || state->err != Z_OK)
+            (state->err != Z_OK && state->err != Z_BUF_ERROR))
         return -1;
     /* since an int is returned, make sure len fits in one, otherwise return
        with an error (this avoids the flaw in the interface) */
     if ((int)len < 0) {
-        gz_error(state, Z_BUF_ERROR, "requested length does not fit in int");
+        gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
         return -1;
+    }
     /* get len bytes to buf, or less than len if at the end */
     got = 0;
     do {
         /* first just try copying data from the output buffer */
-        if (state->have) {
+        if (state->x.have) {
-            n = state->have > len ? len : state->have;
+            n = state->x.have > len ? len : state->x.have;
-            memcpy(buf, state->next, n);
+            memcpy(buf, state->x.next, n);
-            state->next += n;
+            state->x.next += n;
-            state->have -= n;
+            state->x.have -= n;
+        }
+        /* output buffer empty -- return if we're at the end of the input */
-        /* output buffer empty -- return if we're at the end of the input */
+        else if (state->eof && strm->avail_in == 0) {
+            state->past = 1;        /* tried to read past end */
-        else if (state->eof && strm->avail_in == 0)
+            break;
             break;
         /* need output data -- for small len or new stream load up our output
            buffer */
         else if (state->how == LOOK || len < (state->size << 1)) {
             /* get more output, looking for header if required */
-            if (gz_make(state) == -1)
+            if (gz_fetch(state) == -1)
                 return -1;
-            continue;       /* no progress yet -- go back to memcpy() above */
+            continue;       /* no progress yet -- go back to copy above */
             /* the copy above assures that we will leave with space in the
                output buffer, allowing at least one gzungetc() to succeed */
         }
         /* large len -- read directly into user buffer */
         else if (state->how == COPY) {      /* read directly */
-            if (gz_load(state, buf, len, &n) == -1)
+            if (gz_load(state, (unsigned char *)buf, len, &n) == -1)
                 return -1;
         }
         /* large len -- decompress directly into user buffer */
         else {  /* state->how == GZIP */
             strm->avail_out = len;
-            strm->next_out = buf;
+            strm->next_out = (unsigned char *)buf;
             if (gz_decomp(state) == -1)
                 return -1;
-            n = state->have;
+            n = state->x.have;
-            state->have = 0;
+            state->x.have = 0;
         }
         /* update progress */
         len -= n;
         buf = (char *)buf + n;
         got += n;
+        state->x.pos += n;
+    } while (len);
+    /* return number of bytes read into user buffer (will fit in int) */
+    return (int)got;
         state->pos += n;
     } while (len);
 /* -- see zlib.h -- */
-    /* return number of bytes read into user buffer (will fit in int) */
+#ifdef Z_PREFIX_SET
-    return (int)got;
+#  undef z_gzgetc
     /* get internal structure */
     if (file == NULL)
         return -1;
     state = (gz_statep)file;
+    /* check that we're reading and that there's no (serious) error */
-    /* check that we're reading and that there's no error */
+    if (state->mode != GZ_READ ||
-    if (state->mode != GZ_READ || state->err != Z_OK)
+        (state->err != Z_OK && state->err != Z_BUF_ERROR))
         return -1;
     /* try output buffer (no need to check for skip request) */
-    if (state->have) {
+    if (state->x.have) {
-        state->have--;
+        state->x.have--;
-        state->pos++;
+        state->x.pos++;
-        return *(state->next)++;
+        return *(state->x.next)++;
+    }
     /* nothing there -- try gzread() */
+    ret = gzread(file, buf, 1);
+    return ret < 1 ? -1 : buf[0];
+}
+int ZEXPORT gzgetc_(file)
+gzFile file;
     ret = gzread(file, buf, 1);
-    return ret < 1 ? -1 : buf[0];
+    return gzgetc(file);
+}
 /* -- see zlib.h -- */
     /* get internal structure */
     if (file == NULL)
         return -1;
     state = (gz_statep)file;
+    /* check that we're reading and that there's no (serious) error */
-    /* check that we're reading and that there's no error */
+    if (state->mode != GZ_READ ||
-    if (state->mode != GZ_READ || state->err != Z_OK)
+        (state->err != Z_OK && state->err != Z_BUF_ERROR))
         return -1;
     /* process a skip request */
     /* can't push EOF */
     if (c < 0)
         return -1;
     /* if output buffer empty, put byte at end (allows more pushing) */
-    if (state->have == 0) {
+    if (state->x.have == 0) {
-        state->have = 1;
+        state->x.have = 1;
-        state->next = state->out + (state->size << 1) - 1;
+        state->x.next = state->out + (state->size << 1) - 1;
-        state->next[0] = c;
+        state->x.next[0] = c;
+        state->x.pos--;
-        state->pos--;
+        state->past = 0;
         return c;
+    }
     /* if no room, give up (must have already done a gzungetc()) */
-    if (state->have == (state->size << 1)) {
+    if (state->x.have == (state->size << 1)) {
-        gz_error(state, Z_BUF_ERROR, "out of room to push characters");
+        gz_error(state, Z_DATA_ERROR, "out of room to push characters");
         return -1;
     }
     /* slide output data if needed and insert byte before existing data */
-    if (state->next == state->out) {
+    if (state->x.next == state->out) {
-        unsigned char *src = state->out + state->have;
+        unsigned char *src = state->out + state->x.have;
         unsigned char *dest = state->out + (state->size << 1);
         while (src > state->out)
             *--dest = *--src;
-        state->next = dest;
+        state->x.next = dest;
     }
-    state->have++;
+    state->x.have++;
+    state->x.next--;
-    state->next--;
+    state->x.next[0] = c;
-    state->next[0] = c;
+    state->x.pos--;
-    state->pos--;
+    state->past = 0;
     return c;
     /* check parameters and get internal structure */
     if (file == NULL || buf == NULL || len < 1)
         return NULL;
     state = (gz_statep)file;
+    /* check that we're reading and that there's no (serious) error */
-    /* check that we're reading and that there's no error */
+    if (state->mode != GZ_READ ||
-    if (state->mode != GZ_READ || state->err != Z_OK)
+        (state->err != Z_OK && state->err != Z_BUF_ERROR))
         return NULL;
     /* process a skip request */
        the contents, let the user worry about that) */
     str = buf;
     left = (unsigned)len - 1;
     if (left) do {
         /* assure that something is in the output buffer */
-        if (state->have == 0) {
-            if (gz_make(state) == -1)
+        if (state->x.have == 0 && gz_fetch(state) == -1)
-                return NULL;            /* error */
+            return NULL;                /* error */
-            if (state->have == 0) {     /* end of file */
+        if (state->x.have == 0) {       /* end of file */
-                if (buf == str)         /* got bupkus */
+            state->past = 1;            /* read past end */
-                    return NULL;
-                break;                  /* got something -- return it */
+            break;                      /* return what we have */
-            }
+        }
         /* look for end-of-line in current output buffer */
-        n = state->have > left ? left : state->have;
+        n = state->x.have > left ? left : state->x.have;
-        eol = memchr(state->next, '\n', n);
+        eol = (unsigned char *)memchr(state->x.next, '\n', n);
         if (eol != NULL)
-            n = (unsigned)(eol - state->next) + 1;
+            n = (unsigned)(eol - state->x.next) + 1;
         /* copy through end-of-line, or remainder if not found */
-        memcpy(buf, state->next, n);
+        memcpy(buf, state->x.next, n);
-        state->have -= n;
+        state->x.have -= n;
-        state->next += n;
+        state->x.next += n;
-        state->pos += n;
+        state->x.pos += n;
         left -= n;
         buf += n;
+    } while (left && eol == NULL);
-    } while (left && eol == NULL);
+    /* return terminated string, or if nothing, end of file */
     if (buf == str)
-    /* found end-of-line or out of space -- terminate string and return it */
+        return NULL;
     buf[0] = 0;
     /* get internal structure */
     if (file == NULL)
         return 0;
     state = (gz_statep)file;
-    /* check that we're reading */
-    if (state->mode != GZ_READ)
-        return 0;
     /* if the state is not known, but we can find out, then do so (this is
        mainly for right after a gzopen() or gzdopen()) */
-    if (state->how == LOOK && state->have == 0)
+    if (state->mode == GZ_READ && state->how == LOOK && state->x.have == 0)
-        (void)gz_head(state);
+        (void)gz_look(state);
-    /* return 1 if reading direct, 0 if decompressing a gzip stream */
+    /* return 1 if transparent, 0 if processing a gzip stream */
     return state->direct;
+}
 /* -- see zlib.h -- */
 int ZEXPORT gzclose_r(file)
     gzFile file;
+{
-    int ret;
+    int ret, err;
     gz_statep state;
     if (state->size) {
         inflateEnd(&(state->strm));
         free(state->out);
         free(state->in);
+    }
+    err = state->err == Z_BUF_ERROR ? Z_BUF_ERROR : Z_OK;
     gz_error(state, Z_OK, NULL);
     free(state->path);
     ret = close(state->fd);
     free(state);
-    return ret ? Z_ERRNO : Z_OK;
+    return ret ? Z_ERRNO : err;
+}

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(root)/programs/develop/libraries/zlib/gzread.c – Rev 1896 → 3926