[331] | 1 | /* gzwrite.c -- zlib functions for writing gzip files
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| 2 | * Copyright (C) 2004-2017 Mark Adler
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| 3 | * For conditions of distribution and use, see copyright notice in zlib.h
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| 4 | */
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| 5 |
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| 6 | #include "gzguts.h"
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| 7 |
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| 8 | /* Local functions */
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| 9 | local int gz_init OF((gz_statep));
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| 10 | local int gz_comp OF((gz_statep, int));
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| 11 | local int gz_zero OF((gz_statep, z_off64_t));
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| 12 | local z_size_t gz_write OF((gz_statep, voidpc, z_size_t));
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| 13 |
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| 14 | /* Initialize state for writing a gzip file. Mark initialization by setting
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| 15 | state->size to non-zero. Return -1 on a memory allocation failure, or 0 on
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| 16 | success. */
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| 17 | local int gz_init(state)
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| 18 | gz_statep state;
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| 19 | {
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| 20 | int ret;
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| 21 | z_streamp strm = &(state->strm);
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| 22 |
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| 23 | /* allocate input buffer (double size for gzprintf) */
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| 24 | state->in = (unsigned char *)malloc(state->want << 1);
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| 25 | if (state->in == NULL) {
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| 26 | gz_error(state, Z_MEM_ERROR, "out of memory");
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| 27 | return -1;
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| 28 | }
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| 29 |
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| 30 | /* only need output buffer and deflate state if compressing */
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| 31 | if (!state->direct) {
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| 32 | /* allocate output buffer */
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| 33 | state->out = (unsigned char *)malloc(state->want);
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| 34 | if (state->out == NULL) {
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| 35 | free(state->in);
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| 36 | gz_error(state, Z_MEM_ERROR, "out of memory");
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| 37 | return -1;
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| 38 | }
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| 39 |
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| 40 | /* allocate deflate memory, set up for gzip compression */
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| 41 | strm->zalloc = Z_NULL;
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| 42 | strm->zfree = Z_NULL;
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| 43 | strm->opaque = Z_NULL;
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| 44 | ret = deflateInit2(strm, state->level, Z_DEFLATED,
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| 45 | MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy);
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| 46 | if (ret != Z_OK) {
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| 47 | free(state->out);
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| 48 | free(state->in);
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| 49 | gz_error(state, Z_MEM_ERROR, "out of memory");
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| 50 | return -1;
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| 51 | }
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| 52 | strm->next_in = NULL;
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| 53 | }
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| 54 |
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| 55 | /* mark state as initialized */
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| 56 | state->size = state->want;
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| 57 |
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| 58 | /* initialize write buffer if compressing */
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| 59 | if (!state->direct) {
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| 60 | strm->avail_out = state->size;
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| 61 | strm->next_out = state->out;
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| 62 | state->x.next = strm->next_out;
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| 63 | }
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| 64 | return 0;
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| 65 | }
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| 66 |
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| 67 | /* Compress whatever is at avail_in and next_in and write to the output file.
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| 68 | Return -1 if there is an error writing to the output file or if gz_init()
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| 69 | fails to allocate memory, otherwise 0. flush is assumed to be a valid
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| 70 | deflate() flush value. If flush is Z_FINISH, then the deflate() state is
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| 71 | reset to start a new gzip stream. If gz->direct is true, then simply write
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| 72 | to the output file without compressing, and ignore flush. */
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| 73 | local int gz_comp(state, flush)
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| 74 | gz_statep state;
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| 75 | int flush;
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| 76 | {
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| 77 | int ret, writ;
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| 78 | unsigned have, put, max = ((unsigned)-1 >> 2) + 1;
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| 79 | z_streamp strm = &(state->strm);
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| 80 |
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| 81 | /* allocate memory if this is the first time through */
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| 82 | if (state->size == 0 && gz_init(state) == -1)
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| 83 | return -1;
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| 84 |
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| 85 | /* write directly if requested */
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| 86 | if (state->direct) {
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| 87 | while (strm->avail_in) {
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| 88 | put = strm->avail_in > max ? max : strm->avail_in;
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| 89 | writ = write(state->fd, strm->next_in, put);
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| 90 | if (writ < 0) {
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| 91 | gz_error(state, Z_ERRNO, zstrerror());
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| 92 | return -1;
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| 93 | }
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| 94 | strm->avail_in -= (unsigned)writ;
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| 95 | strm->next_in += writ;
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| 96 | }
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| 97 | return 0;
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| 98 | }
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| 99 |
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| 100 | /* run deflate() on provided input until it produces no more output */
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| 101 | ret = Z_OK;
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| 102 | do {
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| 103 | /* write out current buffer contents if full, or if flushing, but if
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| 104 | doing Z_FINISH then don't write until we get to Z_STREAM_END */
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| 105 | if (strm->avail_out == 0 || (flush != Z_NO_FLUSH &&
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| 106 | (flush != Z_FINISH || ret == Z_STREAM_END))) {
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| 107 | while (strm->next_out > state->x.next) {
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| 108 | put = strm->next_out - state->x.next > (int)max ? max :
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| 109 | (unsigned)(strm->next_out - state->x.next);
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| 110 | writ = write(state->fd, state->x.next, put);
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| 111 | if (writ < 0) {
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| 112 | gz_error(state, Z_ERRNO, zstrerror());
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| 113 | return -1;
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| 114 | }
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| 115 | state->x.next += writ;
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| 116 | }
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| 117 | if (strm->avail_out == 0) {
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| 118 | strm->avail_out = state->size;
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| 119 | strm->next_out = state->out;
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| 120 | state->x.next = state->out;
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| 121 | }
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| 122 | }
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| 123 |
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| 124 | /* compress */
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| 125 | have = strm->avail_out;
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| 126 | ret = deflate(strm, flush);
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| 127 | if (ret == Z_STREAM_ERROR) {
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| 128 | gz_error(state, Z_STREAM_ERROR,
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| 129 | "internal error: deflate stream corrupt");
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| 130 | return -1;
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| 131 | }
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| 132 | have -= strm->avail_out;
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| 133 | } while (have);
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| 134 |
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| 135 | /* if that completed a deflate stream, allow another to start */
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| 136 | if (flush == Z_FINISH)
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| 137 | deflateReset(strm);
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| 138 |
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| 139 | /* all done, no errors */
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| 140 | return 0;
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| 141 | }
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| 142 |
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| 143 | /* Compress len zeros to output. Return -1 on a write error or memory
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| 144 | allocation failure by gz_comp(), or 0 on success. */
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| 145 | local int gz_zero(state, len)
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| 146 | gz_statep state;
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| 147 | z_off64_t len;
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| 148 | {
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| 149 | int first;
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| 150 | unsigned n;
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| 151 | z_streamp strm = &(state->strm);
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| 152 |
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| 153 | /* consume whatever's left in the input buffer */
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| 154 | if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
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| 155 | return -1;
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| 156 |
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| 157 | /* compress len zeros (len guaranteed > 0) */
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| 158 | first = 1;
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| 159 | while (len) {
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| 160 | n = GT_OFF(state->size) || (z_off64_t)state->size > len ?
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| 161 | (unsigned)len : state->size;
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| 162 | if (first) {
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| 163 | memset(state->in, 0, n);
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| 164 | first = 0;
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| 165 | }
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| 166 | strm->avail_in = n;
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| 167 | strm->next_in = state->in;
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| 168 | state->x.pos += n;
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| 169 | if (gz_comp(state, Z_NO_FLUSH) == -1)
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| 170 | return -1;
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| 171 | len -= n;
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| 172 | }
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| 173 | return 0;
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| 174 | }
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| 175 |
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| 176 | /* Write len bytes from buf to file. Return the number of bytes written. If
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| 177 | the returned value is less than len, then there was an error. */
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| 178 | local z_size_t gz_write(state, buf, len)
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| 179 | gz_statep state;
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| 180 | voidpc buf;
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| 181 | z_size_t len;
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| 182 | {
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| 183 | z_size_t put = len;
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| 184 |
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| 185 | /* if len is zero, avoid unnecessary operations */
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| 186 | if (len == 0)
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| 187 | return 0;
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| 188 |
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| 189 | /* allocate memory if this is the first time through */
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| 190 | if (state->size == 0 && gz_init(state) == -1)
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| 191 | return 0;
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| 192 |
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| 193 | /* check for seek request */
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| 194 | if (state->seek) {
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| 195 | state->seek = 0;
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| 196 | if (gz_zero(state, state->skip) == -1)
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| 197 | return 0;
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| 198 | }
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| 199 |
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| 200 | /* for small len, copy to input buffer, otherwise compress directly */
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| 201 | if (len < state->size) {
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| 202 | /* copy to input buffer, compress when full */
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| 203 | do {
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| 204 | unsigned have, copy;
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| 205 |
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| 206 | if (state->strm.avail_in == 0)
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| 207 | state->strm.next_in = state->in;
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| 208 | have = (unsigned)((state->strm.next_in + state->strm.avail_in) -
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| 209 | state->in);
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| 210 | copy = state->size - have;
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| 211 | if (copy > len)
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| 212 | copy = len;
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| 213 | memcpy(state->in + have, buf, copy);
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| 214 | state->strm.avail_in += copy;
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| 215 | state->x.pos += copy;
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| 216 | buf = (const char *)buf + copy;
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| 217 | len -= copy;
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| 218 | if (len && gz_comp(state, Z_NO_FLUSH) == -1)
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| 219 | return 0;
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| 220 | } while (len);
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| 221 | }
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| 222 | else {
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| 223 | /* consume whatever's left in the input buffer */
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| 224 | if (state->strm.avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
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| 225 | return 0;
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| 226 |
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| 227 | /* directly compress user buffer to file */
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| 228 | state->strm.next_in = (z_const Bytef *)buf;
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| 229 | do {
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| 230 | unsigned n = (unsigned)-1;
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| 231 | if (n > len)
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| 232 | n = len;
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| 233 | state->strm.avail_in = n;
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| 234 | state->x.pos += n;
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| 235 | if (gz_comp(state, Z_NO_FLUSH) == -1)
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| 236 | return 0;
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| 237 | len -= n;
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| 238 | } while (len);
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| 239 | }
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| 240 |
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| 241 | /* input was all buffered or compressed */
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| 242 | return put;
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| 243 | }
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| 244 |
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| 245 | /* -- see zlib.h -- */
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| 246 | int ZEXPORT gzwrite(file, buf, len)
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| 247 | gzFile file;
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| 248 | voidpc buf;
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| 249 | unsigned len;
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| 250 | {
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| 251 | gz_statep state;
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| 252 |
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| 253 | /* get internal structure */
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| 254 | if (file == NULL)
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| 255 | return 0;
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| 256 | state = (gz_statep)file;
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| 257 |
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| 258 | /* check that we're writing and that there's no error */
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| 259 | if (state->mode != GZ_WRITE || state->err != Z_OK)
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| 260 | return 0;
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| 261 |
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| 262 | /* since an int is returned, make sure len fits in one, otherwise return
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| 263 | with an error (this avoids a flaw in the interface) */
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| 264 | if ((int)len < 0) {
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| 265 | gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
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| 266 | return 0;
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| 267 | }
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| 268 |
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| 269 | /* write len bytes from buf (the return value will fit in an int) */
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| 270 | return (int)gz_write(state, buf, len);
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| 271 | }
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| 272 |
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| 273 | /* -- see zlib.h -- */
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| 274 | z_size_t ZEXPORT gzfwrite(buf, size, nitems, file)
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| 275 | voidpc buf;
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| 276 | z_size_t size;
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| 277 | z_size_t nitems;
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| 278 | gzFile file;
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| 279 | {
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| 280 | z_size_t len;
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| 281 | gz_statep state;
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| 282 |
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| 283 | /* get internal structure */
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| 284 | if (file == NULL)
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| 285 | return 0;
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| 286 | state = (gz_statep)file;
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| 287 |
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| 288 | /* check that we're writing and that there's no error */
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| 289 | if (state->mode != GZ_WRITE || state->err != Z_OK)
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| 290 | return 0;
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| 291 |
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| 292 | /* compute bytes to read -- error on overflow */
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| 293 | len = nitems * size;
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| 294 | if (size && len / size != nitems) {
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| 295 | gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
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| 296 | return 0;
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| 297 | }
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| 298 |
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| 299 | /* write len bytes to buf, return the number of full items written */
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| 300 | return len ? gz_write(state, buf, len) / size : 0;
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| 301 | }
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| 302 |
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| 303 | /* -- see zlib.h -- */
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| 304 | int ZEXPORT gzputc(file, c)
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| 305 | gzFile file;
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| 306 | int c;
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| 307 | {
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| 308 | unsigned have;
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| 309 | unsigned char buf[1];
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| 310 | gz_statep state;
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| 311 | z_streamp strm;
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| 312 |
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| 313 | /* get internal structure */
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| 314 | if (file == NULL)
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| 315 | return -1;
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| 316 | state = (gz_statep)file;
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| 317 | strm = &(state->strm);
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| 318 |
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| 319 | /* check that we're writing and that there's no error */
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| 320 | if (state->mode != GZ_WRITE || state->err != Z_OK)
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| 321 | return -1;
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| 322 |
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| 323 | /* check for seek request */
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| 324 | if (state->seek) {
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| 325 | state->seek = 0;
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| 326 | if (gz_zero(state, state->skip) == -1)
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| 327 | return -1;
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| 328 | }
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| 329 |
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| 330 | /* try writing to input buffer for speed (state->size == 0 if buffer not
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| 331 | initialized) */
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| 332 | if (state->size) {
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| 333 | if (strm->avail_in == 0)
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| 334 | strm->next_in = state->in;
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| 335 | have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
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| 336 | if (have < state->size) {
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| 337 | state->in[have] = (unsigned char)c;
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| 338 | strm->avail_in++;
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| 339 | state->x.pos++;
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| 340 | return c & 0xff;
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| 341 | }
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| 342 | }
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| 343 |
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| 344 | /* no room in buffer or not initialized, use gz_write() */
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| 345 | buf[0] = (unsigned char)c;
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| 346 | if (gz_write(state, buf, 1) != 1)
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| 347 | return -1;
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| 348 | return c & 0xff;
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| 349 | }
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| 350 |
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| 351 | /* -- see zlib.h -- */
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| 352 | int ZEXPORT gzputs(file, str)
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| 353 | gzFile file;
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| 354 | const char *str;
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| 355 | {
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| 356 | int ret;
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| 357 | z_size_t len;
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| 358 | gz_statep state;
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| 359 |
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| 360 | /* get internal structure */
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| 361 | if (file == NULL)
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| 362 | return -1;
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| 363 | state = (gz_statep)file;
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| 364 |
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| 365 | /* check that we're writing and that there's no error */
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| 366 | if (state->mode != GZ_WRITE || state->err != Z_OK)
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| 367 | return -1;
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| 368 |
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| 369 | /* write string */
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| 370 | len = strlen(str);
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| 371 | ret = gz_write(state, str, len);
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| 372 | return ret == 0 && len != 0 ? -1 : ret;
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| 373 | }
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| 374 |
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| 375 | #if defined(STDC) || defined(Z_HAVE_STDARG_H)
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| 376 | #include <stdarg.h>
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| 377 |
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| 378 | /* -- see zlib.h -- */
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| 379 | int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va)
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| 380 | {
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| 381 | int len;
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| 382 | unsigned left;
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| 383 | char *next;
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| 384 | gz_statep state;
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| 385 | z_streamp strm;
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| 386 |
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| 387 | /* get internal structure */
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| 388 | if (file == NULL)
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| 389 | return Z_STREAM_ERROR;
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| 390 | state = (gz_statep)file;
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| 391 | strm = &(state->strm);
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| 392 |
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| 393 | /* check that we're writing and that there's no error */
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| 394 | if (state->mode != GZ_WRITE || state->err != Z_OK)
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| 395 | return Z_STREAM_ERROR;
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| 396 |
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| 397 | /* make sure we have some buffer space */
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| 398 | if (state->size == 0 && gz_init(state) == -1)
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| 399 | return state->err;
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| 400 |
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| 401 | /* check for seek request */
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| 402 | if (state->seek) {
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| 403 | state->seek = 0;
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| 404 | if (gz_zero(state, state->skip) == -1)
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| 405 | return state->err;
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| 406 | }
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| 407 |
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| 408 | /* do the printf() into the input buffer, put length in len -- the input
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| 409 | buffer is double-sized just for this function, so there is guaranteed to
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| 410 | be state->size bytes available after the current contents */
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| 411 | if (strm->avail_in == 0)
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| 412 | strm->next_in = state->in;
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| 413 | next = (char *)(state->in + (strm->next_in - state->in) + strm->avail_in);
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| 414 | next[state->size - 1] = 0;
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| 415 | #ifdef NO_vsnprintf
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| 416 | # ifdef HAS_vsprintf_void
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| 417 | (void)vsprintf(next, format, va);
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| 418 | for (len = 0; len < state->size; len++)
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| 419 | if (next[len] == 0) break;
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| 420 | # else
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| 421 | len = vsprintf(next, format, va);
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| 422 | # endif
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| 423 | #else
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| 424 | # ifdef HAS_vsnprintf_void
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| 425 | (void)vsnprintf(next, state->size, format, va);
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| 426 | len = strlen(next);
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| 427 | # else
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| 428 | len = vsnprintf(next, state->size, format, va);
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| 429 | # endif
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| 430 | #endif
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| 431 |
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| 432 | /* check that printf() results fit in buffer */
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| 433 | if (len == 0 || (unsigned)len >= state->size || next[state->size - 1] != 0)
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| 434 | return 0;
|
---|
| 435 |
|
---|
| 436 | /* update buffer and position, compress first half if past that */
|
---|
| 437 | strm->avail_in += (unsigned)len;
|
---|
| 438 | state->x.pos += len;
|
---|
| 439 | if (strm->avail_in >= state->size) {
|
---|
| 440 | left = strm->avail_in - state->size;
|
---|
| 441 | strm->avail_in = state->size;
|
---|
| 442 | if (gz_comp(state, Z_NO_FLUSH) == -1)
|
---|
| 443 | return state->err;
|
---|
| 444 | memcpy(state->in, state->in + state->size, left);
|
---|
| 445 | strm->next_in = state->in;
|
---|
| 446 | strm->avail_in = left;
|
---|
| 447 | }
|
---|
| 448 | return len;
|
---|
| 449 | }
|
---|
| 450 |
|
---|
| 451 | int ZEXPORTVA gzprintf(gzFile file, const char *format, ...)
|
---|
| 452 | {
|
---|
| 453 | va_list va;
|
---|
| 454 | int ret;
|
---|
| 455 |
|
---|
| 456 | va_start(va, format);
|
---|
| 457 | ret = gzvprintf(file, format, va);
|
---|
| 458 | va_end(va);
|
---|
| 459 | return ret;
|
---|
| 460 | }
|
---|
| 461 |
|
---|
| 462 | #else /* !STDC && !Z_HAVE_STDARG_H */
|
---|
| 463 |
|
---|
| 464 | /* -- see zlib.h -- */
|
---|
| 465 | int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
|
---|
| 466 | a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
|
---|
| 467 | gzFile file;
|
---|
| 468 | const char *format;
|
---|
| 469 | int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
|
---|
| 470 | a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
|
---|
| 471 | {
|
---|
| 472 | unsigned len, left;
|
---|
| 473 | char *next;
|
---|
| 474 | gz_statep state;
|
---|
| 475 | z_streamp strm;
|
---|
| 476 |
|
---|
| 477 | /* get internal structure */
|
---|
| 478 | if (file == NULL)
|
---|
| 479 | return Z_STREAM_ERROR;
|
---|
| 480 | state = (gz_statep)file;
|
---|
| 481 | strm = &(state->strm);
|
---|
| 482 |
|
---|
| 483 | /* check that can really pass pointer in ints */
|
---|
| 484 | if (sizeof(int) != sizeof(void *))
|
---|
| 485 | return Z_STREAM_ERROR;
|
---|
| 486 |
|
---|
| 487 | /* check that we're writing and that there's no error */
|
---|
| 488 | if (state->mode != GZ_WRITE || state->err != Z_OK)
|
---|
| 489 | return Z_STREAM_ERROR;
|
---|
| 490 |
|
---|
| 491 | /* make sure we have some buffer space */
|
---|
| 492 | if (state->size == 0 && gz_init(state) == -1)
|
---|
| 493 | return state->error;
|
---|
| 494 |
|
---|
| 495 | /* check for seek request */
|
---|
| 496 | if (state->seek) {
|
---|
| 497 | state->seek = 0;
|
---|
| 498 | if (gz_zero(state, state->skip) == -1)
|
---|
| 499 | return state->error;
|
---|
| 500 | }
|
---|
| 501 |
|
---|
| 502 | /* do the printf() into the input buffer, put length in len -- the input
|
---|
| 503 | buffer is double-sized just for this function, so there is guaranteed to
|
---|
| 504 | be state->size bytes available after the current contents */
|
---|
| 505 | if (strm->avail_in == 0)
|
---|
| 506 | strm->next_in = state->in;
|
---|
| 507 | next = (char *)(strm->next_in + strm->avail_in);
|
---|
| 508 | next[state->size - 1] = 0;
|
---|
| 509 | #ifdef NO_snprintf
|
---|
| 510 | # ifdef HAS_sprintf_void
|
---|
| 511 | sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12,
|
---|
| 512 | a13, a14, a15, a16, a17, a18, a19, a20);
|
---|
| 513 | for (len = 0; len < size; len++)
|
---|
| 514 | if (next[len] == 0)
|
---|
| 515 | break;
|
---|
| 516 | # else
|
---|
| 517 | len = sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11,
|
---|
| 518 | a12, a13, a14, a15, a16, a17, a18, a19, a20);
|
---|
| 519 | # endif
|
---|
| 520 | #else
|
---|
| 521 | # ifdef HAS_snprintf_void
|
---|
| 522 | snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9,
|
---|
| 523 | a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
|
---|
| 524 | len = strlen(next);
|
---|
| 525 | # else
|
---|
| 526 | len = snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8,
|
---|
| 527 | a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
|
---|
| 528 | # endif
|
---|
| 529 | #endif
|
---|
| 530 |
|
---|
| 531 | /* check that printf() results fit in buffer */
|
---|
| 532 | if (len == 0 || len >= state->size || next[state->size - 1] != 0)
|
---|
| 533 | return 0;
|
---|
| 534 |
|
---|
| 535 | /* update buffer and position, compress first half if past that */
|
---|
| 536 | strm->avail_in += len;
|
---|
| 537 | state->x.pos += len;
|
---|
| 538 | if (strm->avail_in >= state->size) {
|
---|
| 539 | left = strm->avail_in - state->size;
|
---|
| 540 | strm->avail_in = state->size;
|
---|
| 541 | if (gz_comp(state, Z_NO_FLUSH) == -1)
|
---|
| 542 | return state->err;
|
---|
| 543 | memcpy(state->in, state->in + state->size, left);
|
---|
| 544 | strm->next_in = state->in;
|
---|
| 545 | strm->avail_in = left;
|
---|
| 546 | }
|
---|
| 547 | return (int)len;
|
---|
| 548 | }
|
---|
| 549 |
|
---|
| 550 | #endif
|
---|
| 551 |
|
---|
| 552 | /* -- see zlib.h -- */
|
---|
| 553 | int ZEXPORT gzflush(file, flush)
|
---|
| 554 | gzFile file;
|
---|
| 555 | int flush;
|
---|
| 556 | {
|
---|
| 557 | gz_statep state;
|
---|
| 558 |
|
---|
| 559 | /* get internal structure */
|
---|
| 560 | if (file == NULL)
|
---|
| 561 | return Z_STREAM_ERROR;
|
---|
| 562 | state = (gz_statep)file;
|
---|
| 563 |
|
---|
| 564 | /* check that we're writing and that there's no error */
|
---|
| 565 | if (state->mode != GZ_WRITE || state->err != Z_OK)
|
---|
| 566 | return Z_STREAM_ERROR;
|
---|
| 567 |
|
---|
| 568 | /* check flush parameter */
|
---|
| 569 | if (flush < 0 || flush > Z_FINISH)
|
---|
| 570 | return Z_STREAM_ERROR;
|
---|
| 571 |
|
---|
| 572 | /* check for seek request */
|
---|
| 573 | if (state->seek) {
|
---|
| 574 | state->seek = 0;
|
---|
| 575 | if (gz_zero(state, state->skip) == -1)
|
---|
| 576 | return state->err;
|
---|
| 577 | }
|
---|
| 578 |
|
---|
| 579 | /* compress remaining data with requested flush */
|
---|
| 580 | (void)gz_comp(state, flush);
|
---|
| 581 | return state->err;
|
---|
| 582 | }
|
---|
| 583 |
|
---|
| 584 | /* -- see zlib.h -- */
|
---|
| 585 | int ZEXPORT gzsetparams(file, level, strategy)
|
---|
| 586 | gzFile file;
|
---|
| 587 | int level;
|
---|
| 588 | int strategy;
|
---|
| 589 | {
|
---|
| 590 | gz_statep state;
|
---|
| 591 | z_streamp strm;
|
---|
| 592 |
|
---|
| 593 | /* get internal structure */
|
---|
| 594 | if (file == NULL)
|
---|
| 595 | return Z_STREAM_ERROR;
|
---|
| 596 | state = (gz_statep)file;
|
---|
| 597 | strm = &(state->strm);
|
---|
| 598 |
|
---|
| 599 | /* check that we're writing and that there's no error */
|
---|
| 600 | if (state->mode != GZ_WRITE || state->err != Z_OK)
|
---|
| 601 | return Z_STREAM_ERROR;
|
---|
| 602 |
|
---|
| 603 | /* if no change is requested, then do nothing */
|
---|
| 604 | if (level == state->level && strategy == state->strategy)
|
---|
| 605 | return Z_OK;
|
---|
| 606 |
|
---|
| 607 | /* check for seek request */
|
---|
| 608 | if (state->seek) {
|
---|
| 609 | state->seek = 0;
|
---|
| 610 | if (gz_zero(state, state->skip) == -1)
|
---|
| 611 | return state->err;
|
---|
| 612 | }
|
---|
| 613 |
|
---|
| 614 | /* change compression parameters for subsequent input */
|
---|
| 615 | if (state->size) {
|
---|
| 616 | /* flush previous input with previous parameters before changing */
|
---|
| 617 | if (strm->avail_in && gz_comp(state, Z_BLOCK) == -1)
|
---|
| 618 | return state->err;
|
---|
| 619 | deflateParams(strm, level, strategy);
|
---|
| 620 | }
|
---|
| 621 | state->level = level;
|
---|
| 622 | state->strategy = strategy;
|
---|
| 623 | return Z_OK;
|
---|
| 624 | }
|
---|
| 625 |
|
---|
| 626 | /* -- see zlib.h -- */
|
---|
| 627 | int ZEXPORT gzclose_w(file)
|
---|
| 628 | gzFile file;
|
---|
| 629 | {
|
---|
| 630 | int ret = Z_OK;
|
---|
| 631 | gz_statep state;
|
---|
| 632 |
|
---|
| 633 | /* get internal structure */
|
---|
| 634 | if (file == NULL)
|
---|
| 635 | return Z_STREAM_ERROR;
|
---|
| 636 | state = (gz_statep)file;
|
---|
| 637 |
|
---|
| 638 | /* check that we're writing */
|
---|
| 639 | if (state->mode != GZ_WRITE)
|
---|
| 640 | return Z_STREAM_ERROR;
|
---|
| 641 |
|
---|
| 642 | /* check for seek request */
|
---|
| 643 | if (state->seek) {
|
---|
| 644 | state->seek = 0;
|
---|
| 645 | if (gz_zero(state, state->skip) == -1)
|
---|
| 646 | ret = state->err;
|
---|
| 647 | }
|
---|
| 648 |
|
---|
| 649 | /* flush, free memory, and close file */
|
---|
| 650 | if (gz_comp(state, Z_FINISH) == -1)
|
---|
| 651 | ret = state->err;
|
---|
| 652 | if (state->size) {
|
---|
| 653 | if (!state->direct) {
|
---|
| 654 | (void)deflateEnd(&(state->strm));
|
---|
| 655 | free(state->out);
|
---|
| 656 | }
|
---|
| 657 | free(state->in);
|
---|
| 658 | }
|
---|
| 659 | gz_error(state, Z_OK, NULL);
|
---|
| 660 | free(state->path);
|
---|
| 661 | if (close(state->fd) == -1)
|
---|
| 662 | ret = Z_ERRNO;
|
---|
| 663 | free(state);
|
---|
| 664 | return ret;
|
---|
| 665 | }
|
---|