Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 1 | /* gzread.c -- zlib functions for reading gzip files |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 2 | * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 Mark Adler |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 3 | * For conditions of distribution and use, see copyright notice in zlib.h |
| 4 | */ |
| 5 | |
| 6 | #include "gzguts.h" |
| 7 | |
| 8 | /* Local functions */ |
| 9 | local int gz_load OF((gz_statep, unsigned char *, unsigned, unsigned *)); |
| 10 | local int gz_avail OF((gz_statep)); |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 11 | local int gz_look OF((gz_statep)); |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 12 | local int gz_decomp OF((gz_statep)); |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 13 | local int gz_fetch OF((gz_statep)); |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 14 | local int gz_skip OF((gz_statep, z_off64_t)); |
| 15 | |
| 16 | /* Use read() to load a buffer -- return -1 on error, otherwise 0. Read from |
| 17 | state->fd, and update state->eof, state->err, and state->msg as appropriate. |
| 18 | This function needs to loop on read(), since read() is not guaranteed to |
| 19 | read the number of bytes requested, depending on the type of descriptor. */ |
| 20 | local int gz_load(state, buf, len, have) |
| 21 | gz_statep state; |
| 22 | unsigned char *buf; |
| 23 | unsigned len; |
| 24 | unsigned *have; |
| 25 | { |
| 26 | int ret; |
| 27 | |
| 28 | *have = 0; |
| 29 | do { |
| 30 | ret = read(state->fd, buf + *have, len - *have); |
| 31 | if (ret <= 0) |
| 32 | break; |
| 33 | *have += ret; |
| 34 | } while (*have < len); |
| 35 | if (ret < 0) { |
| 36 | gz_error(state, Z_ERRNO, zstrerror()); |
| 37 | return -1; |
| 38 | } |
| 39 | if (ret == 0) |
| 40 | state->eof = 1; |
| 41 | return 0; |
| 42 | } |
| 43 | |
| 44 | /* Load up input buffer and set eof flag if last data loaded -- return -1 on |
| 45 | error, 0 otherwise. Note that the eof flag is set when the end of the input |
| 46 | file is reached, even though there may be unused data in the buffer. Once |
| 47 | that data has been used, no more attempts will be made to read the file. |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 48 | If strm->avail_in != 0, then the current data is moved to the beginning of |
| 49 | the input buffer, and then the remainder of the buffer is loaded with the |
| 50 | available data from the input file. */ |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 51 | local int gz_avail(state) |
| 52 | gz_statep state; |
| 53 | { |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 54 | unsigned got; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 55 | z_streamp strm = &(state->strm); |
| 56 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 57 | if (state->err != Z_OK && state->err != Z_BUF_ERROR) |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 58 | return -1; |
| 59 | if (state->eof == 0) { |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 60 | if (strm->avail_in) { /* copy what's there to the start */ |
| 61 | unsigned char *p = state->in; |
| 62 | unsigned const char *q = strm->next_in; |
| 63 | unsigned n = strm->avail_in; |
| 64 | do { |
| 65 | *p++ = *q++; |
| 66 | } while (--n); |
| 67 | } |
| 68 | if (gz_load(state, state->in + strm->avail_in, |
| 69 | state->size - strm->avail_in, &got) == -1) |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 70 | return -1; |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 71 | strm->avail_in += got; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 72 | strm->next_in = state->in; |
| 73 | } |
| 74 | return 0; |
| 75 | } |
| 76 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 77 | /* Look for gzip header, set up for inflate or copy. state->x.have must be 0. |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 78 | If this is the first time in, allocate required memory. state->how will be |
| 79 | left unchanged if there is no more input data available, will be set to COPY |
| 80 | if there is no gzip header and direct copying will be performed, or it will |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 81 | be set to GZIP for decompression. If direct copying, then leftover input |
| 82 | data from the input buffer will be copied to the output buffer. In that |
| 83 | case, all further file reads will be directly to either the output buffer or |
| 84 | a user buffer. If decompressing, the inflate state will be initialized. |
| 85 | gz_look() will return 0 on success or -1 on failure. */ |
| 86 | local int gz_look(state) |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 87 | gz_statep state; |
| 88 | { |
| 89 | z_streamp strm = &(state->strm); |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 90 | |
| 91 | /* allocate read buffers and inflate memory */ |
| 92 | if (state->size == 0) { |
| 93 | /* allocate buffers */ |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 94 | state->in = (unsigned char *)malloc(state->want); |
| 95 | state->out = (unsigned char *)malloc(state->want << 1); |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 96 | if (state->in == NULL || state->out == NULL) { |
| 97 | if (state->out != NULL) |
| 98 | free(state->out); |
| 99 | if (state->in != NULL) |
| 100 | free(state->in); |
| 101 | gz_error(state, Z_MEM_ERROR, "out of memory"); |
| 102 | return -1; |
| 103 | } |
| 104 | state->size = state->want; |
| 105 | |
| 106 | /* allocate inflate memory */ |
| 107 | state->strm.zalloc = Z_NULL; |
| 108 | state->strm.zfree = Z_NULL; |
| 109 | state->strm.opaque = Z_NULL; |
| 110 | state->strm.avail_in = 0; |
| 111 | state->strm.next_in = Z_NULL; |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 112 | if (inflateInit2(&(state->strm), 15 + 16) != Z_OK) { /* gunzip */ |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 113 | free(state->out); |
| 114 | free(state->in); |
| 115 | state->size = 0; |
| 116 | gz_error(state, Z_MEM_ERROR, "out of memory"); |
| 117 | return -1; |
| 118 | } |
| 119 | } |
| 120 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 121 | /* get at least the magic bytes in the input buffer */ |
| 122 | if (strm->avail_in < 2) { |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 123 | if (gz_avail(state) == -1) |
| 124 | return -1; |
| 125 | if (strm->avail_in == 0) |
| 126 | return 0; |
| 127 | } |
| 128 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 129 | /* look for gzip magic bytes -- if there, do gzip decoding (note: there is |
| 130 | a logical dilemma here when considering the case of a partially written |
| 131 | gzip file, to wit, if a single 31 byte is written, then we cannot tell |
| 132 | whether this is a single-byte file, or just a partially written gzip |
| 133 | file -- for here we assume that if a gzip file is being written, then |
| 134 | the header will be written in a single operation, so that reading a |
| 135 | single byte is sufficient indication that it is not a gzip file) */ |
| 136 | if (strm->avail_in > 1 && |
| 137 | strm->next_in[0] == 31 && strm->next_in[1] == 139) { |
| 138 | inflateReset(strm); |
| 139 | state->how = GZIP; |
| 140 | state->direct = 0; |
| 141 | return 0; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 142 | } |
| 143 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 144 | /* no gzip header -- if we were decoding gzip before, then this is trailing |
| 145 | garbage. Ignore the trailing garbage and finish. */ |
| 146 | if (state->direct == 0) { |
| 147 | strm->avail_in = 0; |
| 148 | state->eof = 1; |
| 149 | state->x.have = 0; |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | /* doing raw i/o, copy any leftover input to output -- this assumes that |
| 154 | the output buffer is larger than the input buffer, which also assures |
| 155 | space for gzungetc() */ |
| 156 | state->x.next = state->out; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 157 | if (strm->avail_in) { |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 158 | memcpy(state->x.next, strm->next_in, strm->avail_in); |
| 159 | state->x.have = strm->avail_in; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 160 | strm->avail_in = 0; |
| 161 | } |
| 162 | state->how = COPY; |
| 163 | state->direct = 1; |
| 164 | return 0; |
| 165 | } |
| 166 | |
| 167 | /* Decompress from input to the provided next_out and avail_out in the state. |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 168 | On return, state->x.have and state->x.next point to the just decompressed |
| 169 | data. If the gzip stream completes, state->how is reset to LOOK to look for |
| 170 | the next gzip stream or raw data, once state->x.have is depleted. Returns 0 |
| 171 | on success, -1 on failure. */ |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 172 | local int gz_decomp(state) |
| 173 | gz_statep state; |
| 174 | { |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 175 | int ret = Z_OK; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 176 | unsigned had; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 177 | z_streamp strm = &(state->strm); |
| 178 | |
| 179 | /* fill output buffer up to end of deflate stream */ |
| 180 | had = strm->avail_out; |
| 181 | do { |
| 182 | /* get more input for inflate() */ |
| 183 | if (strm->avail_in == 0 && gz_avail(state) == -1) |
| 184 | return -1; |
| 185 | if (strm->avail_in == 0) { |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 186 | gz_error(state, Z_BUF_ERROR, "unexpected end of file"); |
| 187 | break; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 188 | } |
| 189 | |
| 190 | /* decompress and handle errors */ |
| 191 | ret = inflate(strm, Z_NO_FLUSH); |
| 192 | if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT) { |
| 193 | gz_error(state, Z_STREAM_ERROR, |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 194 | "internal error: inflate stream corrupt"); |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 195 | return -1; |
| 196 | } |
| 197 | if (ret == Z_MEM_ERROR) { |
| 198 | gz_error(state, Z_MEM_ERROR, "out of memory"); |
| 199 | return -1; |
| 200 | } |
| 201 | if (ret == Z_DATA_ERROR) { /* deflate stream invalid */ |
| 202 | gz_error(state, Z_DATA_ERROR, |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 203 | strm->msg == NULL ? "compressed data error" : strm->msg); |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 204 | return -1; |
| 205 | } |
| 206 | } while (strm->avail_out && ret != Z_STREAM_END); |
| 207 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 208 | /* update available output */ |
| 209 | state->x.have = had - strm->avail_out; |
| 210 | state->x.next = strm->next_out - state->x.have; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 211 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 212 | /* if the gzip stream completed successfully, look for another */ |
| 213 | if (ret == Z_STREAM_END) |
| 214 | state->how = LOOK; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 215 | |
| 216 | /* good decompression */ |
| 217 | return 0; |
| 218 | } |
| 219 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 220 | /* Fetch data and put it in the output buffer. Assumes state->x.have is 0. |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 221 | Data is either copied from the input file or decompressed from the input |
| 222 | file depending on state->how. If state->how is LOOK, then a gzip header is |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 223 | looked for to determine whether to copy or decompress. Returns -1 on error, |
| 224 | otherwise 0. gz_fetch() will leave state->how as COPY or GZIP unless the |
| 225 | end of the input file has been reached and all data has been processed. */ |
| 226 | local int gz_fetch(state) |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 227 | gz_statep state; |
| 228 | { |
| 229 | z_streamp strm = &(state->strm); |
| 230 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 231 | do { |
| 232 | switch(state->how) { |
| 233 | case LOOK: /* -> LOOK, COPY (only if never GZIP), or GZIP */ |
| 234 | if (gz_look(state) == -1) |
| 235 | return -1; |
| 236 | if (state->how == LOOK) |
| 237 | return 0; |
| 238 | break; |
| 239 | case COPY: /* -> COPY */ |
| 240 | if (gz_load(state, state->out, state->size << 1, &(state->x.have)) |
| 241 | == -1) |
| 242 | return -1; |
| 243 | state->x.next = state->out; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 244 | return 0; |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 245 | case GZIP: /* -> GZIP or LOOK (if end of gzip stream) */ |
| 246 | strm->avail_out = state->size << 1; |
| 247 | strm->next_out = state->out; |
| 248 | if (gz_decomp(state) == -1) |
| 249 | return -1; |
| 250 | } |
| 251 | } while (state->x.have == 0 && (!state->eof || strm->avail_in)); |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 252 | return 0; |
| 253 | } |
| 254 | |
| 255 | /* Skip len uncompressed bytes of output. Return -1 on error, 0 on success. */ |
| 256 | local int gz_skip(state, len) |
| 257 | gz_statep state; |
| 258 | z_off64_t len; |
| 259 | { |
| 260 | unsigned n; |
| 261 | |
| 262 | /* skip over len bytes or reach end-of-file, whichever comes first */ |
| 263 | while (len) |
| 264 | /* skip over whatever is in output buffer */ |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 265 | if (state->x.have) { |
| 266 | n = GT_OFF(state->x.have) || (z_off64_t)state->x.have > len ? |
| 267 | (unsigned)len : state->x.have; |
| 268 | state->x.have -= n; |
| 269 | state->x.next += n; |
| 270 | state->x.pos += n; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 271 | len -= n; |
| 272 | } |
| 273 | |
| 274 | /* output buffer empty -- return if we're at the end of the input */ |
| 275 | else if (state->eof && state->strm.avail_in == 0) |
| 276 | break; |
| 277 | |
| 278 | /* need more data to skip -- load up output buffer */ |
| 279 | else { |
| 280 | /* get more output, looking for header if required */ |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 281 | if (gz_fetch(state) == -1) |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 282 | return -1; |
| 283 | } |
| 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | /* -- see zlib.h -- */ |
| 288 | int ZEXPORT gzread(file, buf, len) |
| 289 | gzFile file; |
| 290 | voidp buf; |
| 291 | unsigned len; |
| 292 | { |
| 293 | unsigned got, n; |
| 294 | gz_statep state; |
| 295 | z_streamp strm; |
| 296 | |
| 297 | /* get internal structure */ |
| 298 | if (file == NULL) |
| 299 | return -1; |
| 300 | state = (gz_statep)file; |
| 301 | strm = &(state->strm); |
| 302 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 303 | /* check that we're reading and that there's no (serious) error */ |
| 304 | if (state->mode != GZ_READ || |
| 305 | (state->err != Z_OK && state->err != Z_BUF_ERROR)) |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 306 | return -1; |
| 307 | |
| 308 | /* since an int is returned, make sure len fits in one, otherwise return |
| 309 | with an error (this avoids the flaw in the interface) */ |
| 310 | if ((int)len < 0) { |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 311 | gz_error(state, Z_DATA_ERROR, "requested length does not fit in int"); |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 312 | return -1; |
| 313 | } |
| 314 | |
| 315 | /* if len is zero, avoid unnecessary operations */ |
| 316 | if (len == 0) |
| 317 | return 0; |
| 318 | |
| 319 | /* process a skip request */ |
| 320 | if (state->seek) { |
| 321 | state->seek = 0; |
| 322 | if (gz_skip(state, state->skip) == -1) |
| 323 | return -1; |
| 324 | } |
| 325 | |
| 326 | /* get len bytes to buf, or less than len if at the end */ |
| 327 | got = 0; |
| 328 | do { |
| 329 | /* first just try copying data from the output buffer */ |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 330 | if (state->x.have) { |
| 331 | n = state->x.have > len ? len : state->x.have; |
| 332 | memcpy(buf, state->x.next, n); |
| 333 | state->x.next += n; |
| 334 | state->x.have -= n; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 335 | } |
| 336 | |
| 337 | /* output buffer empty -- return if we're at the end of the input */ |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 338 | else if (state->eof && strm->avail_in == 0) { |
| 339 | state->past = 1; /* tried to read past end */ |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 340 | break; |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 341 | } |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 342 | |
| 343 | /* need output data -- for small len or new stream load up our output |
| 344 | buffer */ |
| 345 | else if (state->how == LOOK || len < (state->size << 1)) { |
| 346 | /* get more output, looking for header if required */ |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 347 | if (gz_fetch(state) == -1) |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 348 | return -1; |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 349 | continue; /* no progress yet -- go back to copy above */ |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 350 | /* the copy above assures that we will leave with space in the |
| 351 | output buffer, allowing at least one gzungetc() to succeed */ |
| 352 | } |
| 353 | |
| 354 | /* large len -- read directly into user buffer */ |
| 355 | else if (state->how == COPY) { /* read directly */ |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 356 | if (gz_load(state, (unsigned char *)buf, len, &n) == -1) |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 357 | return -1; |
| 358 | } |
| 359 | |
| 360 | /* large len -- decompress directly into user buffer */ |
| 361 | else { /* state->how == GZIP */ |
| 362 | strm->avail_out = len; |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 363 | strm->next_out = (unsigned char *)buf; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 364 | if (gz_decomp(state) == -1) |
| 365 | return -1; |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 366 | n = state->x.have; |
| 367 | state->x.have = 0; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 368 | } |
| 369 | |
| 370 | /* update progress */ |
| 371 | len -= n; |
| 372 | buf = (char *)buf + n; |
| 373 | got += n; |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 374 | state->x.pos += n; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 375 | } while (len); |
| 376 | |
| 377 | /* return number of bytes read into user buffer (will fit in int) */ |
| 378 | return (int)got; |
| 379 | } |
| 380 | |
| 381 | /* -- see zlib.h -- */ |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 382 | #ifdef Z_PREFIX_SET |
| 383 | # undef z_gzgetc |
| 384 | #else |
| 385 | # undef gzgetc |
| 386 | #endif |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 387 | int ZEXPORT gzgetc(file) |
| 388 | gzFile file; |
| 389 | { |
| 390 | int ret; |
| 391 | unsigned char buf[1]; |
| 392 | gz_statep state; |
| 393 | |
| 394 | /* get internal structure */ |
| 395 | if (file == NULL) |
| 396 | return -1; |
| 397 | state = (gz_statep)file; |
| 398 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 399 | /* check that we're reading and that there's no (serious) error */ |
| 400 | if (state->mode != GZ_READ || |
| 401 | (state->err != Z_OK && state->err != Z_BUF_ERROR)) |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 402 | return -1; |
| 403 | |
| 404 | /* try output buffer (no need to check for skip request) */ |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 405 | if (state->x.have) { |
| 406 | state->x.have--; |
| 407 | state->x.pos++; |
| 408 | return *(state->x.next)++; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 409 | } |
| 410 | |
| 411 | /* nothing there -- try gzread() */ |
| 412 | ret = gzread(file, buf, 1); |
| 413 | return ret < 1 ? -1 : buf[0]; |
| 414 | } |
| 415 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 416 | int ZEXPORT gzgetc_(file) |
| 417 | gzFile file; |
| 418 | { |
| 419 | return gzgetc(file); |
| 420 | } |
| 421 | |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 422 | /* -- see zlib.h -- */ |
| 423 | int ZEXPORT gzungetc(c, file) |
| 424 | int c; |
| 425 | gzFile file; |
| 426 | { |
| 427 | gz_statep state; |
| 428 | |
| 429 | /* get internal structure */ |
| 430 | if (file == NULL) |
| 431 | return -1; |
| 432 | state = (gz_statep)file; |
| 433 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 434 | /* check that we're reading and that there's no (serious) error */ |
| 435 | if (state->mode != GZ_READ || |
| 436 | (state->err != Z_OK && state->err != Z_BUF_ERROR)) |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 437 | return -1; |
| 438 | |
| 439 | /* process a skip request */ |
| 440 | if (state->seek) { |
| 441 | state->seek = 0; |
| 442 | if (gz_skip(state, state->skip) == -1) |
| 443 | return -1; |
| 444 | } |
| 445 | |
| 446 | /* can't push EOF */ |
| 447 | if (c < 0) |
| 448 | return -1; |
| 449 | |
| 450 | /* if output buffer empty, put byte at end (allows more pushing) */ |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 451 | if (state->x.have == 0) { |
| 452 | state->x.have = 1; |
| 453 | state->x.next = state->out + (state->size << 1) - 1; |
| 454 | state->x.next[0] = c; |
| 455 | state->x.pos--; |
| 456 | state->past = 0; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 457 | return c; |
| 458 | } |
| 459 | |
| 460 | /* if no room, give up (must have already done a gzungetc()) */ |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 461 | if (state->x.have == (state->size << 1)) { |
| 462 | gz_error(state, Z_DATA_ERROR, "out of room to push characters"); |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 463 | return -1; |
| 464 | } |
| 465 | |
| 466 | /* slide output data if needed and insert byte before existing data */ |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 467 | if (state->x.next == state->out) { |
| 468 | unsigned char *src = state->out + state->x.have; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 469 | unsigned char *dest = state->out + (state->size << 1); |
| 470 | while (src > state->out) |
| 471 | *--dest = *--src; |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 472 | state->x.next = dest; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 473 | } |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 474 | state->x.have++; |
| 475 | state->x.next--; |
| 476 | state->x.next[0] = c; |
| 477 | state->x.pos--; |
| 478 | state->past = 0; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 479 | return c; |
| 480 | } |
| 481 | |
| 482 | /* -- see zlib.h -- */ |
| 483 | char * ZEXPORT gzgets(file, buf, len) |
| 484 | gzFile file; |
| 485 | char *buf; |
| 486 | int len; |
| 487 | { |
| 488 | unsigned left, n; |
| 489 | char *str; |
| 490 | unsigned char *eol; |
| 491 | gz_statep state; |
| 492 | |
| 493 | /* check parameters and get internal structure */ |
| 494 | if (file == NULL || buf == NULL || len < 1) |
| 495 | return NULL; |
| 496 | state = (gz_statep)file; |
| 497 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 498 | /* check that we're reading and that there's no (serious) error */ |
| 499 | if (state->mode != GZ_READ || |
| 500 | (state->err != Z_OK && state->err != Z_BUF_ERROR)) |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 501 | return NULL; |
| 502 | |
| 503 | /* process a skip request */ |
| 504 | if (state->seek) { |
| 505 | state->seek = 0; |
| 506 | if (gz_skip(state, state->skip) == -1) |
| 507 | return NULL; |
| 508 | } |
| 509 | |
| 510 | /* copy output bytes up to new line or len - 1, whichever comes first -- |
| 511 | append a terminating zero to the string (we don't check for a zero in |
| 512 | the contents, let the user worry about that) */ |
| 513 | str = buf; |
| 514 | left = (unsigned)len - 1; |
| 515 | if (left) do { |
| 516 | /* assure that something is in the output buffer */ |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 517 | if (state->x.have == 0 && gz_fetch(state) == -1) |
| 518 | return NULL; /* error */ |
| 519 | if (state->x.have == 0) { /* end of file */ |
| 520 | state->past = 1; /* read past end */ |
| 521 | break; /* return what we have */ |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 522 | } |
| 523 | |
| 524 | /* look for end-of-line in current output buffer */ |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 525 | n = state->x.have > left ? left : state->x.have; |
| 526 | eol = (unsigned char *)memchr(state->x.next, '\n', n); |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 527 | if (eol != NULL) |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 528 | n = (unsigned)(eol - state->x.next) + 1; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 529 | |
| 530 | /* copy through end-of-line, or remainder if not found */ |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 531 | memcpy(buf, state->x.next, n); |
| 532 | state->x.have -= n; |
| 533 | state->x.next += n; |
| 534 | state->x.pos += n; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 535 | left -= n; |
| 536 | buf += n; |
| 537 | } while (left && eol == NULL); |
| 538 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 539 | /* return terminated string, or if nothing, end of file */ |
| 540 | if (buf == str) |
| 541 | return NULL; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 542 | buf[0] = 0; |
| 543 | return str; |
| 544 | } |
| 545 | |
| 546 | /* -- see zlib.h -- */ |
| 547 | int ZEXPORT gzdirect(file) |
| 548 | gzFile file; |
| 549 | { |
| 550 | gz_statep state; |
| 551 | |
| 552 | /* get internal structure */ |
| 553 | if (file == NULL) |
| 554 | return 0; |
| 555 | state = (gz_statep)file; |
| 556 | |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 557 | /* if the state is not known, but we can find out, then do so (this is |
| 558 | mainly for right after a gzopen() or gzdopen()) */ |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 559 | if (state->mode == GZ_READ && state->how == LOOK && state->x.have == 0) |
| 560 | (void)gz_look(state); |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 561 | |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 562 | /* return 1 if transparent, 0 if processing a gzip stream */ |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 563 | return state->direct; |
| 564 | } |
| 565 | |
| 566 | /* -- see zlib.h -- */ |
| 567 | int ZEXPORT gzclose_r(file) |
| 568 | gzFile file; |
| 569 | { |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 570 | int ret, err; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 571 | gz_statep state; |
| 572 | |
| 573 | /* get internal structure */ |
| 574 | if (file == NULL) |
| 575 | return Z_STREAM_ERROR; |
| 576 | state = (gz_statep)file; |
| 577 | |
| 578 | /* check that we're reading */ |
| 579 | if (state->mode != GZ_READ) |
| 580 | return Z_STREAM_ERROR; |
| 581 | |
| 582 | /* free memory and close file */ |
| 583 | if (state->size) { |
| 584 | inflateEnd(&(state->strm)); |
| 585 | free(state->out); |
| 586 | free(state->in); |
| 587 | } |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 588 | err = state->err == Z_BUF_ERROR ? Z_BUF_ERROR : Z_OK; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 589 | gz_error(state, Z_OK, NULL); |
| 590 | free(state->path); |
| 591 | ret = close(state->fd); |
| 592 | free(state); |
Christian Heimes | c20bcde | 2013-10-21 12:03:09 +0200 | [diff] [blame] | 593 | return ret ? Z_ERRNO : err; |
Martin v. Löwis | ccbd427 | 2010-08-28 07:37:05 +0000 | [diff] [blame] | 594 | } |