Decompress from input to the provided next_out and avail_out in the state. On return, state->x.have and state->x.next point to the just decompressed data. If the gzip stream completes, state->how is reset to LOOK to look for the next gzip stream or raw data, once state->x.have is depleted. Returns 0 on success, -1 on failure. */
| 154 | the next gzip stream or raw data, once state->x.have is depleted. Returns 0 |
| 155 | on success, -1 on failure. */ |
| 156 | local int gz_decomp(gz_statep state) { |
| 157 | int ret = Z_OK; |
| 158 | unsigned had; |
| 159 | z_streamp strm = &(state->strm); |
| 160 | |
| 161 | /* fill output buffer up to end of deflate stream */ |
| 162 | had = strm->avail_out; |
| 163 | do { |
| 164 | /* get more input for inflate() */ |
| 165 | if (strm->avail_in == 0 && gz_avail(state) == -1) |
| 166 | return -1; |
| 167 | if (strm->avail_in == 0) { |
| 168 | gz_error(state, Z_BUF_ERROR, "unexpected end of file"); |
| 169 | break; |
| 170 | } |
| 171 | |
| 172 | /* decompress and handle errors */ |
| 173 | ret = inflate(strm, Z_NO_FLUSH); |
| 174 | if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT) { |
| 175 | gz_error(state, Z_STREAM_ERROR, |
| 176 | "internal error: inflate stream corrupt"); |
| 177 | return -1; |
| 178 | } |
| 179 | if (ret == Z_MEM_ERROR) { |
| 180 | gz_error(state, Z_MEM_ERROR, "out of memory"); |
| 181 | return -1; |
| 182 | } |
| 183 | if (ret == Z_DATA_ERROR) { /* deflate stream invalid */ |
| 184 | gz_error(state, Z_DATA_ERROR, |
| 185 | strm->msg == NULL ? "compressed data error" : strm->msg); |
| 186 | return -1; |
| 187 | } |
| 188 | } while (strm->avail_out && ret != Z_STREAM_END); |
| 189 | |
| 190 | /* update available output */ |
| 191 | state->x.have = had - strm->avail_out; |
| 192 | state->x.next = strm->next_out - state->x.have; |
| 193 | |
| 194 | /* if the gzip stream completed successfully, look for another */ |
| 195 | if (ret == Z_STREAM_END) |
| 196 | state->how = LOOK; |
| 197 | |
| 198 | /* good decompression */ |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | /* Fetch data and put it in the output buffer. Assumes state->x.have is 0. |
| 203 | Data is either copied from the input file or decompressed from the input |