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| 1 /* gzwrite.c -- zlib functions for writing gzip files |
| 2 * Copyright (C) 2004, 2005, 2010 Mark Adler |
| 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_init OF((gz_statep)); |
| 10 local int gz_comp OF((gz_statep, int)); |
| 11 local int gz_zero OF((gz_statep, z_off64_t)); |
| 12 |
| 13 /* Initialize state for writing a gzip file. Mark initialization by setting |
| 14 state->size to non-zero. Return -1 on failure or 0 on success. */ |
| 15 local int gz_init(state) |
| 16 gz_statep state; |
| 17 { |
| 18 int ret; |
| 19 z_streamp strm = &(state->strm); |
| 20 |
| 21 /* allocate input and output buffers */ |
| 22 state->in = malloc(state->want); |
| 23 state->out = malloc(state->want); |
| 24 if (state->in == NULL || state->out == NULL) { |
| 25 if (state->out != NULL) |
| 26 free(state->out); |
| 27 if (state->in != NULL) |
| 28 free(state->in); |
| 29 gz_error(state, Z_MEM_ERROR, "out of memory"); |
| 30 return -1; |
| 31 } |
| 32 |
| 33 /* allocate deflate memory, set up for gzip compression */ |
| 34 strm->zalloc = Z_NULL; |
| 35 strm->zfree = Z_NULL; |
| 36 strm->opaque = Z_NULL; |
| 37 ret = deflateInit2(strm, state->level, Z_DEFLATED, |
| 38 15 + 16, 8, state->strategy); |
| 39 if (ret != Z_OK) { |
| 40 free(state->in); |
| 41 gz_error(state, Z_MEM_ERROR, "out of memory"); |
| 42 return -1; |
| 43 } |
| 44 |
| 45 /* mark state as initialized */ |
| 46 state->size = state->want; |
| 47 |
| 48 /* initialize write buffer */ |
| 49 strm->avail_out = state->size; |
| 50 strm->next_out = state->out; |
| 51 state->next = strm->next_out; |
| 52 return 0; |
| 53 } |
| 54 |
| 55 /* Compress whatever is at avail_in and next_in and write to the output file. |
| 56 Return -1 if there is an error writing to the output file, otherwise 0. |
| 57 flush is assumed to be a valid deflate() flush value. If flush is Z_FINISH, |
| 58 then the deflate() state is reset to start a new gzip stream. */ |
| 59 local int gz_comp(state, flush) |
| 60 gz_statep state; |
| 61 int flush; |
| 62 { |
| 63 int ret, got; |
| 64 unsigned have; |
| 65 z_streamp strm = &(state->strm); |
| 66 |
| 67 /* allocate memory if this is the first time through */ |
| 68 if (state->size == 0 && gz_init(state) == -1) |
| 69 return -1; |
| 70 |
| 71 /* run deflate() on provided input until it produces no more output */ |
| 72 ret = Z_OK; |
| 73 do { |
| 74 /* write out current buffer contents if full, or if flushing, but if |
| 75 doing Z_FINISH then don't write until we get to Z_STREAM_END */ |
| 76 if (strm->avail_out == 0 || (flush != Z_NO_FLUSH && |
| 77 (flush != Z_FINISH || ret == Z_STREAM_END))) { |
| 78 have = (unsigned)(strm->next_out - state->next); |
| 79 if (have && ((got = write(state->fd, state->next, have)) < 0 || |
| 80 (unsigned)got != have)) { |
| 81 gz_error(state, Z_ERRNO, zstrerror()); |
| 82 return -1; |
| 83 } |
| 84 if (strm->avail_out == 0) { |
| 85 strm->avail_out = state->size; |
| 86 strm->next_out = state->out; |
| 87 } |
| 88 state->next = strm->next_out; |
| 89 } |
| 90 |
| 91 /* compress */ |
| 92 have = strm->avail_out; |
| 93 ret = deflate(strm, flush); |
| 94 if (ret == Z_STREAM_ERROR) { |
| 95 gz_error(state, Z_STREAM_ERROR, |
| 96 "internal error: deflate stream corrupt"); |
| 97 return -1; |
| 98 } |
| 99 have -= strm->avail_out; |
| 100 } while (have); |
| 101 |
| 102 /* if that completed a deflate stream, allow another to start */ |
| 103 if (flush == Z_FINISH) |
| 104 deflateReset(strm); |
| 105 |
| 106 /* all done, no errors */ |
| 107 return 0; |
| 108 } |
| 109 |
| 110 /* Compress len zeros to output. Return -1 on error, 0 on success. */ |
| 111 local int gz_zero(state, len) |
| 112 gz_statep state; |
| 113 z_off64_t len; |
| 114 { |
| 115 int first; |
| 116 unsigned n; |
| 117 z_streamp strm = &(state->strm); |
| 118 |
| 119 /* consume whatever's left in the input buffer */ |
| 120 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) |
| 121 return -1; |
| 122 |
| 123 /* compress len zeros (len guaranteed > 0) */ |
| 124 first = 1; |
| 125 while (len) { |
| 126 n = GT_OFF(state->size) || (z_off64_t)state->size > len ? |
| 127 (unsigned)len : state->size; |
| 128 if (first) { |
| 129 memset(state->in, 0, n); |
| 130 first = 0; |
| 131 } |
| 132 strm->avail_in = n; |
| 133 strm->next_in = state->in; |
| 134 state->pos += n; |
| 135 if (gz_comp(state, Z_NO_FLUSH) == -1) |
| 136 return -1; |
| 137 len -= n; |
| 138 } |
| 139 return 0; |
| 140 } |
| 141 |
| 142 /* -- see zlib.h -- */ |
| 143 int ZEXPORT gzwrite(file, buf, len) |
| 144 gzFile file; |
| 145 voidpc buf; |
| 146 unsigned len; |
| 147 { |
| 148 unsigned put = len; |
| 149 unsigned n; |
| 150 gz_statep state; |
| 151 z_streamp strm; |
| 152 |
| 153 /* get internal structure */ |
| 154 if (file == NULL) |
| 155 return 0; |
| 156 state = (gz_statep)file; |
| 157 strm = &(state->strm); |
| 158 |
| 159 /* check that we're writing and that there's no error */ |
| 160 if (state->mode != GZ_WRITE || state->err != Z_OK) |
| 161 return 0; |
| 162 |
| 163 /* since an int is returned, make sure len fits in one, otherwise return |
| 164 with an error (this avoids the flaw in the interface) */ |
| 165 if ((int)len < 0) { |
| 166 gz_error(state, Z_BUF_ERROR, "requested length does not fit in int"); |
| 167 return 0; |
| 168 } |
| 169 |
| 170 /* if len is zero, avoid unnecessary operations */ |
| 171 if (len == 0) |
| 172 return 0; |
| 173 |
| 174 /* allocate memory if this is the first time through */ |
| 175 if (state->size == 0 && gz_init(state) == -1) |
| 176 return 0; |
| 177 |
| 178 /* check for seek request */ |
| 179 if (state->seek) { |
| 180 state->seek = 0; |
| 181 if (gz_zero(state, state->skip) == -1) |
| 182 return 0; |
| 183 } |
| 184 |
| 185 /* for small len, copy to input buffer, otherwise compress directly */ |
| 186 if (len < state->size) { |
| 187 /* copy to input buffer, compress when full */ |
| 188 do { |
| 189 if (strm->avail_in == 0) |
| 190 strm->next_in = state->in; |
| 191 n = state->size - strm->avail_in; |
| 192 if (n > len) |
| 193 n = len; |
| 194 memcpy(strm->next_in + strm->avail_in, buf, n); |
| 195 strm->avail_in += n; |
| 196 state->pos += n; |
| 197 buf = (char *)buf + n; |
| 198 len -= n; |
| 199 if (len && gz_comp(state, Z_NO_FLUSH) == -1) |
| 200 return 0; |
| 201 } while (len); |
| 202 } |
| 203 else { |
| 204 /* consume whatever's left in the input buffer */ |
| 205 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) |
| 206 return 0; |
| 207 |
| 208 /* directly compress user buffer to file */ |
| 209 strm->avail_in = len; |
| 210 strm->next_in = (voidp)buf; |
| 211 state->pos += len; |
| 212 if (gz_comp(state, Z_NO_FLUSH) == -1) |
| 213 return 0; |
| 214 } |
| 215 |
| 216 /* input was all buffered or compressed (put will fit in int) */ |
| 217 return (int)put; |
| 218 } |
| 219 |
| 220 /* -- see zlib.h -- */ |
| 221 int ZEXPORT gzputc(file, c) |
| 222 gzFile file; |
| 223 int c; |
| 224 { |
| 225 unsigned char buf[1]; |
| 226 gz_statep state; |
| 227 z_streamp strm; |
| 228 |
| 229 /* get internal structure */ |
| 230 if (file == NULL) |
| 231 return -1; |
| 232 state = (gz_statep)file; |
| 233 strm = &(state->strm); |
| 234 |
| 235 /* check that we're writing and that there's no error */ |
| 236 if (state->mode != GZ_WRITE || state->err != Z_OK) |
| 237 return -1; |
| 238 |
| 239 /* check for seek request */ |
| 240 if (state->seek) { |
| 241 state->seek = 0; |
| 242 if (gz_zero(state, state->skip) == -1) |
| 243 return -1; |
| 244 } |
| 245 |
| 246 /* try writing to input buffer for speed (state->size == 0 if buffer not |
| 247 initialized) */ |
| 248 if (strm->avail_in < state->size) { |
| 249 if (strm->avail_in == 0) |
| 250 strm->next_in = state->in; |
| 251 strm->next_in[strm->avail_in++] = c; |
| 252 state->pos++; |
| 253 return c; |
| 254 } |
| 255 |
| 256 /* no room in buffer or not initialized, use gz_write() */ |
| 257 buf[0] = c; |
| 258 if (gzwrite(file, buf, 1) != 1) |
| 259 return -1; |
| 260 return c; |
| 261 } |
| 262 |
| 263 /* -- see zlib.h -- */ |
| 264 int ZEXPORT gzputs(file, str) |
| 265 gzFile file; |
| 266 const char *str; |
| 267 { |
| 268 int ret; |
| 269 unsigned len; |
| 270 |
| 271 /* write string */ |
| 272 len = (unsigned)strlen(str); |
| 273 ret = gzwrite(file, str, len); |
| 274 return ret == 0 && len != 0 ? -1 : ret; |
| 275 } |
| 276 |
| 277 #ifdef STDC |
| 278 #include <stdarg.h> |
| 279 |
| 280 /* -- see zlib.h -- */ |
| 281 int ZEXPORTVA gzprintf (gzFile file, const char *format, ...) |
| 282 { |
| 283 int size, len; |
| 284 gz_statep state; |
| 285 z_streamp strm; |
| 286 va_list va; |
| 287 |
| 288 /* get internal structure */ |
| 289 if (file == NULL) |
| 290 return -1; |
| 291 state = (gz_statep)file; |
| 292 strm = &(state->strm); |
| 293 |
| 294 /* check that we're writing and that there's no error */ |
| 295 if (state->mode != GZ_WRITE || state->err != Z_OK) |
| 296 return 0; |
| 297 |
| 298 /* make sure we have some buffer space */ |
| 299 if (state->size == 0 && gz_init(state) == -1) |
| 300 return 0; |
| 301 |
| 302 /* check for seek request */ |
| 303 if (state->seek) { |
| 304 state->seek = 0; |
| 305 if (gz_zero(state, state->skip) == -1) |
| 306 return 0; |
| 307 } |
| 308 |
| 309 /* consume whatever's left in the input buffer */ |
| 310 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) |
| 311 return 0; |
| 312 |
| 313 /* do the printf() into the input buffer, put length in len */ |
| 314 size = (int)(state->size); |
| 315 state->in[size - 1] = 0; |
| 316 va_start(va, format); |
| 317 #ifdef NO_vsnprintf |
| 318 # ifdef HAS_vsprintf_void |
| 319 (void)vsprintf(state->in, format, va); |
| 320 va_end(va); |
| 321 for (len = 0; len < size; len++) |
| 322 if (state->in[len] == 0) break; |
| 323 # else |
| 324 len = vsprintf(state->in, format, va); |
| 325 va_end(va); |
| 326 # endif |
| 327 #else |
| 328 # ifdef HAS_vsnprintf_void |
| 329 (void)vsnprintf(state->in, size, format, va); |
| 330 va_end(va); |
| 331 len = strlen(state->in); |
| 332 # else |
| 333 len = vsnprintf((char *)(state->in), size, format, va); |
| 334 va_end(va); |
| 335 # endif |
| 336 #endif |
| 337 |
| 338 /* check that printf() results fit in buffer */ |
| 339 if (len <= 0 || len >= (int)size || state->in[size - 1] != 0) |
| 340 return 0; |
| 341 |
| 342 /* update buffer and position, defer compression until needed */ |
| 343 strm->avail_in = (unsigned)len; |
| 344 strm->next_in = state->in; |
| 345 state->pos += len; |
| 346 return len; |
| 347 } |
| 348 |
| 349 #else /* !STDC */ |
| 350 |
| 351 /* -- see zlib.h -- */ |
| 352 int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, |
| 353 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20) |
| 354 gzFile file; |
| 355 const char *format; |
| 356 int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, |
| 357 a11, a12, a13, a14, a15, a16, a17, a18, a19, a20; |
| 358 { |
| 359 int size, len; |
| 360 gz_statep state; |
| 361 z_streamp strm; |
| 362 |
| 363 /* get internal structure */ |
| 364 if (file == NULL) |
| 365 return -1; |
| 366 state = (gz_statep)file; |
| 367 strm = &(state->strm); |
| 368 |
| 369 /* check that we're writing and that there's no error */ |
| 370 if (state->mode != GZ_WRITE || state->err != Z_OK) |
| 371 return 0; |
| 372 |
| 373 /* make sure we have some buffer space */ |
| 374 if (state->size == 0 && gz_init(state) == -1) |
| 375 return 0; |
| 376 |
| 377 /* check for seek request */ |
| 378 if (state->seek) { |
| 379 state->seek = 0; |
| 380 if (gz_zero(state, state->skip) == -1) |
| 381 return 0; |
| 382 } |
| 383 |
| 384 /* consume whatever's left in the input buffer */ |
| 385 if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) |
| 386 return 0; |
| 387 |
| 388 /* do the printf() into the input buffer, put length in len */ |
| 389 size = (int)(state->size); |
| 390 state->in[size - 1] = 0; |
| 391 #ifdef NO_snprintf |
| 392 # ifdef HAS_sprintf_void |
| 393 sprintf(state->in, format, a1, a2, a3, a4, a5, a6, a7, a8, |
| 394 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); |
| 395 for (len = 0; len < size; len++) |
| 396 if (state->in[len] == 0) break; |
| 397 # else |
| 398 len = sprintf(state->in, format, a1, a2, a3, a4, a5, a6, a7, a8, |
| 399 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); |
| 400 # endif |
| 401 #else |
| 402 # ifdef HAS_snprintf_void |
| 403 snprintf(state->in, size, format, a1, a2, a3, a4, a5, a6, a7, a8, |
| 404 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); |
| 405 len = strlen(state->in); |
| 406 # else |
| 407 len = snprintf(state->in, size, format, a1, a2, a3, a4, a5, a6, a7, a8, |
| 408 a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); |
| 409 # endif |
| 410 #endif |
| 411 |
| 412 /* check that printf() results fit in buffer */ |
| 413 if (len <= 0 || len >= (int)size || state->in[size - 1] != 0) |
| 414 return 0; |
| 415 |
| 416 /* update buffer and position, defer compression until needed */ |
| 417 strm->avail_in = (unsigned)len; |
| 418 strm->next_in = state->in; |
| 419 state->pos += len; |
| 420 return len; |
| 421 } |
| 422 |
| 423 #endif |
| 424 |
| 425 /* -- see zlib.h -- */ |
| 426 int ZEXPORT gzflush(file, flush) |
| 427 gzFile file; |
| 428 int flush; |
| 429 { |
| 430 gz_statep state; |
| 431 |
| 432 /* get internal structure */ |
| 433 if (file == NULL) |
| 434 return -1; |
| 435 state = (gz_statep)file; |
| 436 |
| 437 /* check that we're writing and that there's no error */ |
| 438 if (state->mode != GZ_WRITE || state->err != Z_OK) |
| 439 return Z_STREAM_ERROR; |
| 440 |
| 441 /* check flush parameter */ |
| 442 if (flush < 0 || flush > Z_FINISH) |
| 443 return Z_STREAM_ERROR; |
| 444 |
| 445 /* check for seek request */ |
| 446 if (state->seek) { |
| 447 state->seek = 0; |
| 448 if (gz_zero(state, state->skip) == -1) |
| 449 return -1; |
| 450 } |
| 451 |
| 452 /* compress remaining data with requested flush */ |
| 453 gz_comp(state, flush); |
| 454 return state->err; |
| 455 } |
| 456 |
| 457 /* -- see zlib.h -- */ |
| 458 int ZEXPORT gzsetparams(file, level, strategy) |
| 459 gzFile file; |
| 460 int level; |
| 461 int strategy; |
| 462 { |
| 463 gz_statep state; |
| 464 z_streamp strm; |
| 465 |
| 466 /* get internal structure */ |
| 467 if (file == NULL) |
| 468 return Z_STREAM_ERROR; |
| 469 state = (gz_statep)file; |
| 470 strm = &(state->strm); |
| 471 |
| 472 /* check that we're writing and that there's no error */ |
| 473 if (state->mode != GZ_WRITE || state->err != Z_OK) |
| 474 return Z_STREAM_ERROR; |
| 475 |
| 476 /* if no change is requested, then do nothing */ |
| 477 if (level == state->level && strategy == state->strategy) |
| 478 return Z_OK; |
| 479 |
| 480 /* check for seek request */ |
| 481 if (state->seek) { |
| 482 state->seek = 0; |
| 483 if (gz_zero(state, state->skip) == -1) |
| 484 return -1; |
| 485 } |
| 486 |
| 487 /* change compression parameters for subsequent input */ |
| 488 if (state->size) { |
| 489 /* flush previous input with previous parameters before changing */ |
| 490 if (strm->avail_in && gz_comp(state, Z_PARTIAL_FLUSH) == -1) |
| 491 return state->err; |
| 492 deflateParams(strm, level, strategy); |
| 493 } |
| 494 state->level = level; |
| 495 state->strategy = strategy; |
| 496 return Z_OK; |
| 497 } |
| 498 |
| 499 /* -- see zlib.h -- */ |
| 500 int ZEXPORT gzclose_w(file) |
| 501 gzFile file; |
| 502 { |
| 503 int ret = 0; |
| 504 gz_statep state; |
| 505 |
| 506 /* get internal structure */ |
| 507 if (file == NULL) |
| 508 return Z_STREAM_ERROR; |
| 509 state = (gz_statep)file; |
| 510 |
| 511 /* check that we're writing */ |
| 512 if (state->mode != GZ_WRITE) |
| 513 return Z_STREAM_ERROR; |
| 514 |
| 515 /* check for seek request */ |
| 516 if (state->seek) { |
| 517 state->seek = 0; |
| 518 ret += gz_zero(state, state->skip); |
| 519 } |
| 520 |
| 521 /* flush, free memory, and close file */ |
| 522 ret += gz_comp(state, Z_FINISH); |
| 523 (void)deflateEnd(&(state->strm)); |
| 524 free(state->out); |
| 525 free(state->in); |
| 526 gz_error(state, Z_OK, NULL); |
| 527 free(state->path); |
| 528 ret += close(state->fd); |
| 529 free(state); |
| 530 return ret ? Z_ERRNO : Z_OK; |
| 531 } |
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