/src/zlib/gzwrite.c

Source (jump to first uncovered line)
/* gzwrite.c -- zlib functions for writing gzip files
 * Copyright (C) 2004-2019 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

#include "gzguts.h"

/* Initialize state for writing a gzip file.  Mark initialization by setting
   state->size to non-zero.  Return -1 on a memory allocation failure, or 0 on
   success. */
local int gz_init(gz_statep state) {
    int ret;
    z_streamp strm = &(state->strm);

    /* allocate input buffer (double size for gzprintf) */
    state->in = (unsigned char *)malloc(state->want << 1);
    if (state->in == NULL) {
        gz_error(state, Z_MEM_ERROR, "out of memory");
        return -1;
    }

    /* only need output buffer and deflate state if compressing */
    if (!state->direct) {
        /* allocate output buffer */
        state->out = (unsigned char *)malloc(state->want);
        if (state->out == NULL) {
            free(state->in);
            gz_error(state, Z_MEM_ERROR, "out of memory");
            return -1;
        }

        /* allocate deflate memory, set up for gzip compression */
        strm->zalloc = Z_NULL;
        strm->zfree = Z_NULL;
        strm->opaque = Z_NULL;
        ret = deflateInit2(strm, state->level, Z_DEFLATED,
                           MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy);
        if (ret != Z_OK) {
            free(state->out);
            free(state->in);
            gz_error(state, Z_MEM_ERROR, "out of memory");
            return -1;
        }
        strm->next_in = NULL;
    }

    /* mark state as initialized */
    state->size = state->want;

    /* initialize write buffer if compressing */
    if (!state->direct) {
        strm->avail_out = state->size;
        strm->next_out = state->out;
        state->x.next = strm->next_out;
    }
    return 0;
}

/* Compress whatever is at avail_in and next_in and write to the output file.
   Return -1 if there is an error writing to the output file or if gz_init()
   fails to allocate memory, otherwise 0.  flush is assumed to be a valid
   deflate() flush value.  If flush is Z_FINISH, then the deflate() state is
   reset to start a new gzip stream.  If gz->direct is true, then simply write
   to the output file without compressing, and ignore flush. */
local int gz_comp(gz_statep state, int flush) {
    int ret, writ;
    unsigned have, put, max = ((unsigned)-1 >> 2) + 1;
    z_streamp strm = &(state->strm);

    /* allocate memory if this is the first time through */
    if (state->size == 0 && gz_init(state) == -1)
        return -1;

    /* write directly if requested */
    if (state->direct) {
        while (strm->avail_in) {
            put = strm->avail_in > max ? max : strm->avail_in;
            writ = write(state->fd, strm->next_in, put);
            if (writ < 0) {
                gz_error(state, Z_ERRNO, zstrerror());
                return -1;
            }
            strm->avail_in -= (unsigned)writ;
            strm->next_in += writ;
        }
        return 0;
    }

    /* check for a pending reset */
    if (state->reset) {
        /* don't start a new gzip member unless there is data to write */
        if (strm->avail_in == 0)
            return 0;
        deflateReset(strm);
        state->reset = 0;
    }

    /* run deflate() on provided input until it produces no more output */
    ret = Z_OK;
    do {
        /* write out current buffer contents if full, or if flushing, but if
           doing Z_FINISH then don't write until we get to Z_STREAM_END */
        if (strm->avail_out == 0 || (flush != Z_NO_FLUSH &&
            (flush != Z_FINISH || ret == Z_STREAM_END))) {
            while (strm->next_out > state->x.next) {
                put = strm->next_out - state->x.next > (int)max ? max :
                      (unsigned)(strm->next_out - state->x.next);
                writ = write(state->fd, state->x.next, put);
                if (writ < 0) {
                    gz_error(state, Z_ERRNO, zstrerror());
                    return -1;
                }
                state->x.next += writ;
            }
            if (strm->avail_out == 0) {
                strm->avail_out = state->size;
                strm->next_out = state->out;
                state->x.next = state->out;
            }
        }

        /* compress */
        have = strm->avail_out;
        ret = deflate(strm, flush);
        if (ret == Z_STREAM_ERROR) {
            gz_error(state, Z_STREAM_ERROR,
                      "internal error: deflate stream corrupt");
            return -1;
        }
        have -= strm->avail_out;
    } while (have);

    /* if that completed a deflate stream, allow another to start */
    if (flush == Z_FINISH)
        state->reset = 1;

    /* all done, no errors */
    return 0;
}

/* Compress len zeros to output.  Return -1 on a write error or memory
   allocation failure by gz_comp(), or 0 on success. */
local int gz_zero(gz_statep state, z_off64_t len) {
    int first;
    unsigned n;
    z_streamp strm = &(state->strm);

    /* consume whatever's left in the input buffer */
    if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
        return -1;

    /* compress len zeros (len guaranteed > 0) */
    first = 1;
    while (len) {
        n = GT_OFF(state->size) || (z_off64_t)state->size > len ?
            (unsigned)len : state->size;
        if (first) {
            memset(state->in, 0, n);
            first = 0;
        }
        strm->avail_in = n;
        strm->next_in = state->in;
        state->x.pos += n;
        if (gz_comp(state, Z_NO_FLUSH) == -1)
            return -1;
        len -= n;
    }
    return 0;
}

/* Write len bytes from buf to file.  Return the number of bytes written.  If
   the returned value is less than len, then there was an error. */
local z_size_t gz_write(gz_statep state, voidpc buf, z_size_t len) {
    z_size_t put = len;

    /* if len is zero, avoid unnecessary operations */
    if (len == 0)
        return 0;

    /* allocate memory if this is the first time through */
    if (state->size == 0 && gz_init(state) == -1)
        return 0;

    /* check for seek request */
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
            return 0;
    }

    /* for small len, copy to input buffer, otherwise compress directly */
    if (len < state->size) {
        /* copy to input buffer, compress when full */
        do {
            unsigned have, copy;

            if (state->strm.avail_in == 0)
                state->strm.next_in = state->in;
            have = (unsigned)((state->strm.next_in + state->strm.avail_in) -
                              state->in);
            copy = state->size - have;
            if (copy > len)
                copy = (unsigned)len;
            memcpy(state->in + have, buf, copy);
            state->strm.avail_in += copy;
            state->x.pos += copy;
            buf = (const char *)buf + copy;
            len -= copy;
            if (len && gz_comp(state, Z_NO_FLUSH) == -1)
                return 0;
        } while (len);
    }
    else {
        /* consume whatever's left in the input buffer */
        if (state->strm.avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
            return 0;

        /* directly compress user buffer to file */
        state->strm.next_in = (z_const Bytef *)buf;
        do {
            unsigned n = (unsigned)-1;
            if (n > len)
                n = (unsigned)len;
            state->strm.avail_in = n;
            state->x.pos += n;
            if (gz_comp(state, Z_NO_FLUSH) == -1)
                return 0;
            len -= n;
        } while (len);
    }

    /* input was all buffered or compressed */
    return put;
}

/* -- see zlib.h -- */
int ZEXPORT gzwrite(gzFile file, voidpc buf, unsigned len) {
    gz_statep state;

    /* get internal structure */
    if (file == NULL)
        return 0;
    state = (gz_statep)file;

    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return 0;

    /* since an int is returned, make sure len fits in one, otherwise return
       with an error (this avoids a flaw in the interface) */
    if ((int)len < 0) {
        gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
        return 0;
    }

    /* write len bytes from buf (the return value will fit in an int) */
    return (int)gz_write(state, buf, len);
}

/* -- see zlib.h -- */
z_size_t ZEXPORT gzfwrite(voidpc buf, z_size_t size, z_size_t nitems,
                          gzFile file) {
    z_size_t len;
    gz_statep state;

    /* get internal structure */
    if (file == NULL)
        return 0;
    state = (gz_statep)file;

    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return 0;

    /* compute bytes to read -- error on overflow */
    len = nitems * size;
    if (size && len / size != nitems) {
        gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
        return 0;
    }

    /* write len bytes to buf, return the number of full items written */
    return len ? gz_write(state, buf, len) / size : 0;
}

/* -- see zlib.h -- */
int ZEXPORT gzputc(gzFile file, int c) {
    unsigned have;
    unsigned char buf[1];
    gz_statep state;
    z_streamp strm;

    /* get internal structure */
    if (file == NULL)
        return -1;
    state = (gz_statep)file;
    strm = &(state->strm);

    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return -1;

    /* check for seek request */
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
            return -1;
    }

    /* try writing to input buffer for speed (state->size == 0 if buffer not
       initialized) */
    if (state->size) {
        if (strm->avail_in == 0)
            strm->next_in = state->in;
        have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
        if (have < state->size) {
            state->in[have] = (unsigned char)c;
            strm->avail_in++;
            state->x.pos++;
            return c & 0xff;
        }
    }

    /* no room in buffer or not initialized, use gz_write() */
    buf[0] = (unsigned char)c;
    if (gz_write(state, buf, 1) != 1)
        return -1;
    return c & 0xff;
}

/* -- see zlib.h -- */
int ZEXPORT gzputs(gzFile file, const char *s) {
    z_size_t len, put;
    gz_statep state;

    /* get internal structure */
    if (file == NULL)
        return -1;
    state = (gz_statep)file;

    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return -1;

    /* write string */
    len = strlen(s);
    if ((int)len < 0 || (unsigned)len != len) {
        gz_error(state, Z_STREAM_ERROR, "string length does not fit in int");
        return -1;
    }
    put = gz_write(state, s, len);
    return put < len ? -1 : (int)len;
}

#if defined(STDC) || defined(Z_HAVE_STDARG_H)
#include <stdarg.h>

/* -- see zlib.h -- */
int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va) {
    int len;
    unsigned left;
    char *next;
    gz_statep state;
    z_streamp strm;

    /* get internal structure */
    if (file == NULL)
        return Z_STREAM_ERROR;
    state = (gz_statep)file;
    strm = &(state->strm);

    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return Z_STREAM_ERROR;

    /* make sure we have some buffer space */
    if (state->size == 0 && gz_init(state) == -1)
        return state->err;

    /* check for seek request */
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
            return state->err;
    }

    /* do the printf() into the input buffer, put length in len -- the input
       buffer is double-sized just for this function, so there is guaranteed to
       be state->size bytes available after the current contents */
    if (strm->avail_in == 0)
        strm->next_in = state->in;
    next = (char *)(state->in + (strm->next_in - state->in) + strm->avail_in);
    next[state->size - 1] = 0;
#ifdef NO_vsnprintf
#  ifdef HAS_vsprintf_void
    (void)vsprintf(next, format, va);
    for (len = 0; len < state->size; len++)
        if (next[len] == 0) break;
#  else
    len = vsprintf(next, format, va);
#  endif
#else
#  ifdef HAS_vsnprintf_void
    (void)vsnprintf(next, state->size, format, va);
    len = strlen(next);
#  else
    len = vsnprintf(next, state->size, format, va);
#  endif
#endif

    /* check that printf() results fit in buffer */
    if (len == 0 || (unsigned)len >= state->size || next[state->size - 1] != 0)
        return 0;

    /* update buffer and position, compress first half if past that */
    strm->avail_in += (unsigned)len;
    state->x.pos += len;
    if (strm->avail_in >= state->size) {
        left = strm->avail_in - state->size;
        strm->avail_in = state->size;
        if (gz_comp(state, Z_NO_FLUSH) == -1)
            return state->err;
        memmove(state->in, state->in + state->size, left);
        strm->next_in = state->in;
        strm->avail_in = left;
    }
    return len;
}

int ZEXPORTVA gzprintf(gzFile file, const char *format, ...) {
    va_list va;
    int ret;

    va_start(va, format);
    ret = gzvprintf(file, format, va);
    va_end(va);
    return ret;
}

#else /* !STDC && !Z_HAVE_STDARG_H */

/* -- see zlib.h -- */
int ZEXPORTVA gzprintf(gzFile file, const char *format, int a1, int a2, int a3,
                       int a4, int a5, int a6, int a7, int a8, int a9, int a10,
                       int a11, int a12, int a13, int a14, int a15, int a16,
                       int a17, int a18, int a19, int a20) {
    unsigned len, left;
    char *next;
    gz_statep state;
    z_streamp strm;

    /* get internal structure */
    if (file == NULL)
        return Z_STREAM_ERROR;
    state = (gz_statep)file;
    strm = &(state->strm);

    /* check that can really pass pointer in ints */
    if (sizeof(int) != sizeof(void *))
        return Z_STREAM_ERROR;

    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return Z_STREAM_ERROR;

    /* make sure we have some buffer space */
    if (state->size == 0 && gz_init(state) == -1)
        return state->error;

    /* check for seek request */
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
            return state->error;
    }

    /* do the printf() into the input buffer, put length in len -- the input
       buffer is double-sized just for this function, so there is guaranteed to
       be state->size bytes available after the current contents */
    if (strm->avail_in == 0)
        strm->next_in = state->in;
    next = (char *)(strm->next_in + strm->avail_in);
    next[state->size - 1] = 0;
#ifdef NO_snprintf
#  ifdef HAS_sprintf_void
    sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12,
            a13, a14, a15, a16, a17, a18, a19, a20);
    for (len = 0; len < size; len++)
        if (next[len] == 0)
            break;
#  else
    len = sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11,
                  a12, a13, a14, a15, a16, a17, a18, a19, a20);
#  endif
#else
#  ifdef HAS_snprintf_void
    snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9,
             a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
    len = strlen(next);
#  else
    len = snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8,
                   a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
#  endif
#endif

    /* check that printf() results fit in buffer */
    if (len == 0 || len >= state->size || next[state->size - 1] != 0)
        return 0;

    /* update buffer and position, compress first half if past that */
    strm->avail_in += len;
    state->x.pos += len;
    if (strm->avail_in >= state->size) {
        left = strm->avail_in - state->size;
        strm->avail_in = state->size;
        if (gz_comp(state, Z_NO_FLUSH) == -1)
            return state->err;
        memmove(state->in, state->in + state->size, left);
        strm->next_in = state->in;
        strm->avail_in = left;
    }
    return (int)len;
}

#endif

/* -- see zlib.h -- */
int ZEXPORT gzflush(gzFile file, int flush) {
    gz_statep state;

    /* get internal structure */
    if (file == NULL)
        return Z_STREAM_ERROR;
    state = (gz_statep)file;

    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return Z_STREAM_ERROR;

    /* check flush parameter */
    if (flush < 0 || flush > Z_FINISH)
        return Z_STREAM_ERROR;

    /* check for seek request */
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
            return state->err;
    }

    /* compress remaining data with requested flush */
    (void)gz_comp(state, flush);
    return state->err;
}

/* -- see zlib.h -- */
int ZEXPORT gzsetparams(gzFile file, int level, int strategy) {
    gz_statep state;
    z_streamp strm;

    /* get internal structure */
    if (file == NULL)
        return Z_STREAM_ERROR;
    state = (gz_statep)file;
    strm = &(state->strm);

    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK || state->direct)
        return Z_STREAM_ERROR;

    /* if no change is requested, then do nothing */
    if (level == state->level && strategy == state->strategy)
        return Z_OK;

    /* check for seek request */
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
            return state->err;
    }

    /* change compression parameters for subsequent input */
    if (state->size) {
        /* flush previous input with previous parameters before changing */
        if (strm->avail_in && gz_comp(state, Z_BLOCK) == -1)
            return state->err;
        deflateParams(strm, level, strategy);
    }
    state->level = level;
    state->strategy = strategy;
    return Z_OK;
}

/* -- see zlib.h -- */
int ZEXPORT gzclose_w(gzFile file) {
    int ret = Z_OK;
    gz_statep state;

    /* get internal structure */
    if (file == NULL)
        return Z_STREAM_ERROR;
    state = (gz_statep)file;

    /* check that we're writing */
    if (state->mode != GZ_WRITE)
        return Z_STREAM_ERROR;

    /* check for seek request */
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
            ret = state->err;
    }

    /* flush, free memory, and close file */
    if (gz_comp(state, Z_FINISH) == -1)
        ret = state->err;
    if (state->size) {
        if (!state->direct) {
            (void)deflateEnd(&(state->strm));
            free(state->out);
        }
        free(state->in);
    }
    gz_error(state, Z_OK, NULL);
    free(state->path);
    if (close(state->fd) == -1)
        ret = Z_ERRNO;
    free(state);
    return ret;
}

Coverage Report

Created: 2025-06-16 07:00

Line	Count	Source (jump to first uncovered line)
1		/* gzwrite.c -- zlib functions for writing gzip files
2		* Copyright (C) 2004-2019 Mark Adler
3		* For conditions of distribution and use, see copyright notice in zlib.h
4		*/
5
6		#include "gzguts.h"
7
8		/* Initialize state for writing a gzip file. Mark initialization by setting
9		state->size to non-zero. Return -1 on a memory allocation failure, or 0 on
10		success. */
11	0	local int gz_init(gz_statep state) {
12	0	int ret;
13	0	z_streamp strm = &(state->strm);
14
15		/* allocate input buffer (double size for gzprintf) */
16	0	state->in = (unsigned char *)malloc(state->want << 1);
17	0	if (state->in == NULL) {
18	0	gz_error(state, Z_MEM_ERROR, "out of memory");
19	0	return -1;
20	0	}
21
22		/* only need output buffer and deflate state if compressing */
23	0	if (!state->direct) {
24		/* allocate output buffer */
25	0	state->out = (unsigned char *)malloc(state->want);
26	0	if (state->out == NULL) {
27	0	free(state->in);
28	0	gz_error(state, Z_MEM_ERROR, "out of memory");
29	0	return -1;
30	0	}
31
32		/* allocate deflate memory, set up for gzip compression */
33	0	strm->zalloc = Z_NULL;
34	0	strm->zfree = Z_NULL;
35	0	strm->opaque = Z_NULL;
36	0	ret = deflateInit2(strm, state->level, Z_DEFLATED,
37	0	MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy);
38	0	if (ret != Z_OK) {
39	0	free(state->out);
40	0	free(state->in);
41	0	gz_error(state, Z_MEM_ERROR, "out of memory");
42	0	return -1;
43	0	}
44	0	strm->next_in = NULL;
45	0	}
46
47		/* mark state as initialized */
48	0	state->size = state->want;
49
50		/* initialize write buffer if compressing */
51	0	if (!state->direct) {
52	0	strm->avail_out = state->size;
53	0	strm->next_out = state->out;
54	0	state->x.next = strm->next_out;
55	0	}
56	0	return 0;
57	0	}
58
59		/* Compress whatever is at avail_in and next_in and write to the output file.
60		Return -1 if there is an error writing to the output file or if gz_init()
61		fails to allocate memory, otherwise 0. flush is assumed to be a valid
62		deflate() flush value. If flush is Z_FINISH, then the deflate() state is
63		reset to start a new gzip stream. If gz->direct is true, then simply write
64		to the output file without compressing, and ignore flush. */
65	0	local int gz_comp(gz_statep state, int flush) {
66	0	int ret, writ;
67	0	unsigned have, put, max = ((unsigned)-1 >> 2) + 1;
68	0	z_streamp strm = &(state->strm);
69
70		/* allocate memory if this is the first time through */
71	0	if (state->size == 0 && gz_init(state) == -1)
72	0	return -1;
73
74		/* write directly if requested */
75	0	if (state->direct) {
76	0	while (strm->avail_in) {
77	0	put = strm->avail_in > max ? max : strm->avail_in;
78	0	writ = write(state->fd, strm->next_in, put);
79	0	if (writ < 0) {
80	0	gz_error(state, Z_ERRNO, zstrerror());
81	0	return -1;
82	0	}
83	0	strm->avail_in -= (unsigned)writ;
84	0	strm->next_in += writ;
85	0	}
86	0	return 0;
87	0	}
88
89		/* check for a pending reset */
90	0	if (state->reset) {
91		/* don't start a new gzip member unless there is data to write */
92	0	if (strm->avail_in == 0)
93	0	return 0;
94	0	deflateReset(strm);
95	0	state->reset = 0;
96	0	}
97
98		/* run deflate() on provided input until it produces no more output */
99	0	ret = Z_OK;
100	0	do {
101		/* write out current buffer contents if full, or if flushing, but if
102		doing Z_FINISH then don't write until we get to Z_STREAM_END */
103	0	if (strm->avail_out == 0 \|\| (flush != Z_NO_FLUSH &&
104	0	(flush != Z_FINISH \|\| ret == Z_STREAM_END))) {
105	0	while (strm->next_out > state->x.next) {
106	0	put = strm->next_out - state->x.next > (int)max ? max :
107	0	(unsigned)(strm->next_out - state->x.next);
108	0	writ = write(state->fd, state->x.next, put);
109	0	if (writ < 0) {
110	0	gz_error(state, Z_ERRNO, zstrerror());
111	0	return -1;
112	0	}
113	0	state->x.next += writ;
114	0	}
115	0	if (strm->avail_out == 0) {
116	0	strm->avail_out = state->size;
117	0	strm->next_out = state->out;
118	0	state->x.next = state->out;
119	0	}
120	0	}
121
122		/* compress */
123	0	have = strm->avail_out;
124	0	ret = deflate(strm, flush);
125	0	if (ret == Z_STREAM_ERROR) {
126	0	gz_error(state, Z_STREAM_ERROR,
127	0	"internal error: deflate stream corrupt");
128	0	return -1;
129	0	}
130	0	have -= strm->avail_out;
131	0	} while (have);
132
133		/* if that completed a deflate stream, allow another to start */
134	0	if (flush == Z_FINISH)
135	0	state->reset = 1;
136
137		/* all done, no errors */
138	0	return 0;
139	0	}
140
141		/* Compress len zeros to output. Return -1 on a write error or memory
142		allocation failure by gz_comp(), or 0 on success. */
143	0	local int gz_zero(gz_statep state, z_off64_t len) {
144	0	int first;
145	0	unsigned n;
146	0	z_streamp strm = &(state->strm);
147
148		/* consume whatever's left in the input buffer */
149	0	if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
150	0	return -1;
151
152		/* compress len zeros (len guaranteed > 0) */
153	0	first = 1;
154	0	while (len) {
155	0	n = GT_OFF(state->size) \|\| (z_off64_t)state->size > len ?
156	0	(unsigned)len : state->size;
157	0	if (first) {
158	0	memset(state->in, 0, n);
159	0	first = 0;
160	0	}
161	0	strm->avail_in = n;
162	0	strm->next_in = state->in;
163	0	state->x.pos += n;
164	0	if (gz_comp(state, Z_NO_FLUSH) == -1)
165	0	return -1;
166	0	len -= n;
167	0	}
168	0	return 0;
169	0	}
170
171		/* Write len bytes from buf to file. Return the number of bytes written. If
172		the returned value is less than len, then there was an error. */
173	0	local z_size_t gz_write(gz_statep state, voidpc buf, z_size_t len) {
174	0	z_size_t put = len;
175
176		/* if len is zero, avoid unnecessary operations */
177	0	if (len == 0)
178	0	return 0;
179
180		/* allocate memory if this is the first time through */
181	0	if (state->size == 0 && gz_init(state) == -1)
182	0	return 0;
183
184		/* check for seek request */
185	0	if (state->seek) {
186	0	state->seek = 0;
187	0	if (gz_zero(state, state->skip) == -1)
188	0	return 0;
189	0	}
190
191		/* for small len, copy to input buffer, otherwise compress directly */
192	0	if (len < state->size) {
193		/* copy to input buffer, compress when full */
194	0	do {
195	0	unsigned have, copy;
196
197	0	if (state->strm.avail_in == 0)
198	0	state->strm.next_in = state->in;
199	0	have = (unsigned)((state->strm.next_in + state->strm.avail_in) -
200	0	state->in);
201	0	copy = state->size - have;
202	0	if (copy > len)
203	0	copy = (unsigned)len;
204	0	memcpy(state->in + have, buf, copy);
205	0	state->strm.avail_in += copy;
206	0	state->x.pos += copy;
207	0	buf = (const char *)buf + copy;
208	0	len -= copy;
209	0	if (len && gz_comp(state, Z_NO_FLUSH) == -1)
210	0	return 0;
211	0	} while (len);
212	0	}
213	0	else {
214		/* consume whatever's left in the input buffer */
215	0	if (state->strm.avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
216	0	return 0;
217
218		/* directly compress user buffer to file */
219	0	state->strm.next_in = (z_const Bytef *)buf;
220	0	do {
221	0	unsigned n = (unsigned)-1;
222	0	if (n > len)
223	0	n = (unsigned)len;
224	0	state->strm.avail_in = n;
225	0	state->x.pos += n;
226	0	if (gz_comp(state, Z_NO_FLUSH) == -1)
227	0	return 0;
228	0	len -= n;
229	0	} while (len);
230	0	}
231
232		/* input was all buffered or compressed */
233	0	return put;
234	0	}
235
236		/* -- see zlib.h -- */
237	0	int ZEXPORT gzwrite(gzFile file, voidpc buf, unsigned len) {
238	0	gz_statep state;
239
240		/* get internal structure */
241	0	if (file == NULL)
242	0	return 0;
243	0	state = (gz_statep)file;
244
245		/* check that we're writing and that there's no error */
246	0	if (state->mode != GZ_WRITE \|\| state->err != Z_OK)
247	0	return 0;
248
249		/* since an int is returned, make sure len fits in one, otherwise return
250		with an error (this avoids a flaw in the interface) */
251	0	if ((int)len < 0) {
252	0	gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
253	0	return 0;
254	0	}
255
256		/* write len bytes from buf (the return value will fit in an int) */
257	0	return (int)gz_write(state, buf, len);
258	0	}
259
260		/* -- see zlib.h -- */
261		z_size_t ZEXPORT gzfwrite(voidpc buf, z_size_t size, z_size_t nitems,
262	0	gzFile file) {
263	0	z_size_t len;
264	0	gz_statep state;
265
266		/* get internal structure */
267	0	if (file == NULL)
268	0	return 0;
269	0	state = (gz_statep)file;
270
271		/* check that we're writing and that there's no error */
272	0	if (state->mode != GZ_WRITE \|\| state->err != Z_OK)
273	0	return 0;
274
275		/* compute bytes to read -- error on overflow */
276	0	len = nitems * size;
277	0	if (size && len / size != nitems) {
278	0	gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
279	0	return 0;
280	0	}
281
282		/* write len bytes to buf, return the number of full items written */
283	0	return len ? gz_write(state, buf, len) / size : 0;
284	0	}
285
286		/* -- see zlib.h -- */
287	0	int ZEXPORT gzputc(gzFile file, int c) {
288	0	unsigned have;
289	0	unsigned char buf[1];
290	0	gz_statep state;
291	0	z_streamp strm;
292
293		/* get internal structure */
294	0	if (file == NULL)
295	0	return -1;
296	0	state = (gz_statep)file;
297	0	strm = &(state->strm);
298
299		/* check that we're writing and that there's no error */
300	0	if (state->mode != GZ_WRITE \|\| state->err != Z_OK)
301	0	return -1;
302
303		/* check for seek request */
304	0	if (state->seek) {
305	0	state->seek = 0;
306	0	if (gz_zero(state, state->skip) == -1)
307	0	return -1;
308	0	}
309
310		/* try writing to input buffer for speed (state->size == 0 if buffer not
311		initialized) */
312	0	if (state->size) {
313	0	if (strm->avail_in == 0)
314	0	strm->next_in = state->in;
315	0	have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
316	0	if (have < state->size) {
317	0	state->in[have] = (unsigned char)c;
318	0	strm->avail_in++;
319	0	state->x.pos++;
320	0	return c & 0xff;
321	0	}
322	0	}
323
324		/* no room in buffer or not initialized, use gz_write() */
325	0	buf[0] = (unsigned char)c;
326	0	if (gz_write(state, buf, 1) != 1)
327	0	return -1;
328	0	return c & 0xff;
329	0	}
330
331		/* -- see zlib.h -- */
332	0	int ZEXPORT gzputs(gzFile file, const char *s) {
333	0	z_size_t len, put;
334	0	gz_statep state;
335
336		/* get internal structure */
337	0	if (file == NULL)
338	0	return -1;
339	0	state = (gz_statep)file;
340
341		/* check that we're writing and that there's no error */
342	0	if (state->mode != GZ_WRITE \|\| state->err != Z_OK)
343	0	return -1;
344
345		/* write string */
346	0	len = strlen(s);
347	0	if ((int)len < 0 \|\| (unsigned)len != len) {
348	0	gz_error(state, Z_STREAM_ERROR, "string length does not fit in int");
349	0	return -1;
350	0	}
351	0	put = gz_write(state, s, len);
352	0	return put < len ? -1 : (int)len;
353	0	}
354
355		#if defined(STDC) \|\| defined(Z_HAVE_STDARG_H)
356		#include <stdarg.h>
357
358		/* -- see zlib.h -- */
359	0	int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va) {
360	0	int len;
361	0	unsigned left;
362	0	char *next;
363	0	gz_statep state;
364	0	z_streamp strm;
365
366		/* get internal structure */
367	0	if (file == NULL)
368	0	return Z_STREAM_ERROR;
369	0	state = (gz_statep)file;
370	0	strm = &(state->strm);
371
372		/* check that we're writing and that there's no error */
373	0	if (state->mode != GZ_WRITE \|\| state->err != Z_OK)
374	0	return Z_STREAM_ERROR;
375
376		/* make sure we have some buffer space */
377	0	if (state->size == 0 && gz_init(state) == -1)
378	0	return state->err;
379
380		/* check for seek request */
381	0	if (state->seek) {
382	0	state->seek = 0;
383	0	if (gz_zero(state, state->skip) == -1)
384	0	return state->err;
385	0	}
386
387		/* do the printf() into the input buffer, put length in len -- the input
388		buffer is double-sized just for this function, so there is guaranteed to
389		be state->size bytes available after the current contents */
390	0	if (strm->avail_in == 0)
391	0	strm->next_in = state->in;
392	0	next = (char *)(state->in + (strm->next_in - state->in) + strm->avail_in);
393	0	next[state->size - 1] = 0;
394		#ifdef NO_vsnprintf
395		# ifdef HAS_vsprintf_void
396		(void)vsprintf(next, format, va);
397		for (len = 0; len < state->size; len++)
398		if (next[len] == 0) break;
399		# else
400		len = vsprintf(next, format, va);
401		# endif
402		#else
403		# ifdef HAS_vsnprintf_void
404		(void)vsnprintf(next, state->size, format, va);
405		len = strlen(next);
406		# else
407	0	len = vsnprintf(next, state->size, format, va);
408	0	# endif
409	0	#endif
410
411		/* check that printf() results fit in buffer */
412	0	if (len == 0 \|\| (unsigned)len >= state->size \|\| next[state->size - 1] != 0)
413	0	return 0;
414
415		/* update buffer and position, compress first half if past that */
416	0	strm->avail_in += (unsigned)len;
417	0	state->x.pos += len;
418	0	if (strm->avail_in >= state->size) {
419	0	left = strm->avail_in - state->size;
420	0	strm->avail_in = state->size;
421	0	if (gz_comp(state, Z_NO_FLUSH) == -1)
422	0	return state->err;
423	0	memmove(state->in, state->in + state->size, left);
424	0	strm->next_in = state->in;
425	0	strm->avail_in = left;
426	0	}
427	0	return len;
428	0	}
429
430	0	int ZEXPORTVA gzprintf(gzFile file, const char *format, ...) {
431	0	va_list va;
432	0	int ret;
433
434	0	va_start(va, format);
435	0	ret = gzvprintf(file, format, va);
436	0	va_end(va);
437	0	return ret;
438	0	}
439
440		#else /* !STDC && !Z_HAVE_STDARG_H */
441
442		/* -- see zlib.h -- */
443		int ZEXPORTVA gzprintf(gzFile file, const char *format, int a1, int a2, int a3,
444		int a4, int a5, int a6, int a7, int a8, int a9, int a10,
445		int a11, int a12, int a13, int a14, int a15, int a16,
446		int a17, int a18, int a19, int a20) {
447		unsigned len, left;
448		char *next;
449		gz_statep state;
450		z_streamp strm;
451
452		/* get internal structure */
453		if (file == NULL)
454		return Z_STREAM_ERROR;
455		state = (gz_statep)file;
456		strm = &(state->strm);
457
458		/* check that can really pass pointer in ints */
459		if (sizeof(int) != sizeof(void *))
460		return Z_STREAM_ERROR;
461
462		/* check that we're writing and that there's no error */
463		if (state->mode != GZ_WRITE \|\| state->err != Z_OK)
464		return Z_STREAM_ERROR;
465
466		/* make sure we have some buffer space */
467		if (state->size == 0 && gz_init(state) == -1)
468		return state->error;
469
470		/* check for seek request */
471		if (state->seek) {
472		state->seek = 0;
473		if (gz_zero(state, state->skip) == -1)
474		return state->error;
475		}
476
477		/* do the printf() into the input buffer, put length in len -- the input
478		buffer is double-sized just for this function, so there is guaranteed to
479		be state->size bytes available after the current contents */
480		if (strm->avail_in == 0)
481		strm->next_in = state->in;
482		next = (char *)(strm->next_in + strm->avail_in);
483		next[state->size - 1] = 0;
484		#ifdef NO_snprintf
485		# ifdef HAS_sprintf_void
486		sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12,
487		a13, a14, a15, a16, a17, a18, a19, a20);
488		for (len = 0; len < size; len++)
489		if (next[len] == 0)
490		break;
491		# else
492		len = sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11,
493		a12, a13, a14, a15, a16, a17, a18, a19, a20);
494		# endif
495		#else
496		# ifdef HAS_snprintf_void
497		snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9,
498		a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
499		len = strlen(next);
500		# else
501		len = snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8,
502		a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
503		# endif
504		#endif
505
506		/* check that printf() results fit in buffer */
507		if (len == 0 \|\| len >= state->size \|\| next[state->size - 1] != 0)
508		return 0;
509
510		/* update buffer and position, compress first half if past that */
511		strm->avail_in += len;
512		state->x.pos += len;
513		if (strm->avail_in >= state->size) {
514		left = strm->avail_in - state->size;
515		strm->avail_in = state->size;
516		if (gz_comp(state, Z_NO_FLUSH) == -1)
517		return state->err;
518		memmove(state->in, state->in + state->size, left);
519		strm->next_in = state->in;
520		strm->avail_in = left;
521		}
522		return (int)len;
523		}
524
525		#endif
526
527		/* -- see zlib.h -- */
528	63.7k	int ZEXPORT gzflush(gzFile file, int flush) {
529	63.7k	gz_statep state;
530
531		/* get internal structure */
532	63.7k	if (file == NULL)
533	0	return Z_STREAM_ERROR;
534	63.7k	state = (gz_statep)file;
535
536		/* check that we're writing and that there's no error */
537	63.7k	if (state->mode != GZ_WRITE \|\| state->err != Z_OK)
538	63.7k	return Z_STREAM_ERROR;
539
540		/* check flush parameter */
541	0	if (flush < 0 \|\| flush > Z_FINISH)
542	0	return Z_STREAM_ERROR;
543
544		/* check for seek request */
545	0	if (state->seek) {
546	0	state->seek = 0;
547	0	if (gz_zero(state, state->skip) == -1)
548	0	return state->err;
549	0	}
550
551		/* compress remaining data with requested flush */
552	0	(void)gz_comp(state, flush);
553	0	return state->err;
554	0	}
555
556		/* -- see zlib.h -- */
557	0	int ZEXPORT gzsetparams(gzFile file, int level, int strategy) {
558	0	gz_statep state;
559	0	z_streamp strm;
560
561		/* get internal structure */
562	0	if (file == NULL)
563	0	return Z_STREAM_ERROR;
564	0	state = (gz_statep)file;
565	0	strm = &(state->strm);
566
567		/* check that we're writing and that there's no error */
568	0	if (state->mode != GZ_WRITE \|\| state->err != Z_OK \|\| state->direct)
569	0	return Z_STREAM_ERROR;
570
571		/* if no change is requested, then do nothing */
572	0	if (level == state->level && strategy == state->strategy)
573	0	return Z_OK;
574
575		/* check for seek request */
576	0	if (state->seek) {
577	0	state->seek = 0;
578	0	if (gz_zero(state, state->skip) == -1)
579	0	return state->err;
580	0	}
581
582		/* change compression parameters for subsequent input */
583	0	if (state->size) {
584		/* flush previous input with previous parameters before changing */
585	0	if (strm->avail_in && gz_comp(state, Z_BLOCK) == -1)
586	0	return state->err;
587	0	deflateParams(strm, level, strategy);
588	0	}
589	0	state->level = level;
590	0	state->strategy = strategy;
591	0	return Z_OK;
592	0	}
593
594		/* -- see zlib.h -- */
595	0	int ZEXPORT gzclose_w(gzFile file) {
596	0	int ret = Z_OK;
597	0	gz_statep state;
598
599		/* get internal structure */
600	0	if (file == NULL)
601	0	return Z_STREAM_ERROR;
602	0	state = (gz_statep)file;
603
604		/* check that we're writing */
605	0	if (state->mode != GZ_WRITE)
606	0	return Z_STREAM_ERROR;
607
608		/* check for seek request */
609	0	if (state->seek) {
610	0	state->seek = 0;
611	0	if (gz_zero(state, state->skip) == -1)
612	0	ret = state->err;
613	0	}
614
615		/* flush, free memory, and close file */
616	0	if (gz_comp(state, Z_FINISH) == -1)
617	0	ret = state->err;
618	0	if (state->size) {
619	0	if (!state->direct) {
620	0	(void)deflateEnd(&(state->strm));
621	0	free(state->out);
622	0	}
623	0	free(state->in);
624	0	}
625	0	gz_error(state, Z_OK, NULL);
626	0	free(state->path);
627	0	if (close(state->fd) == -1)
628	0	ret = Z_ERRNO;
629	0	free(state);
630	0	return ret;
631	0	}