Annotation of embedaddon/sudo/zlib/gzwrite.c, revision 1.1.1.2
1.1 misho 1: /* gzwrite.c -- zlib functions for writing gzip files
1.1.1.2 ! misho 2: * Copyright (C) 2004, 2005, 2010, 2011, 2012 Mark Adler
1.1 misho 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:
1.1.1.2 ! misho 21: /* allocate input buffer */
1.1 misho 22: state->in = malloc(state->want);
1.1.1.2 ! misho 23: if (state->in == NULL) {
1.1 misho 24: gz_error(state, Z_MEM_ERROR, "out of memory");
25: return -1;
26: }
27:
1.1.1.2 ! misho 28: /* only need output buffer and deflate state if compressing */
! 29: if (!state->direct) {
! 30: /* allocate output buffer */
! 31: state->out = malloc(state->want);
! 32: if (state->out == NULL) {
! 33: free(state->in);
! 34: gz_error(state, Z_MEM_ERROR, "out of memory");
! 35: return -1;
! 36: }
! 37:
! 38: /* allocate deflate memory, set up for gzip compression */
! 39: strm->zalloc = Z_NULL;
! 40: strm->zfree = Z_NULL;
! 41: strm->opaque = Z_NULL;
! 42: ret = deflateInit2(strm, state->level, Z_DEFLATED,
! 43: MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy);
! 44: if (ret != Z_OK) {
! 45: free(state->out);
! 46: free(state->in);
! 47: gz_error(state, Z_MEM_ERROR, "out of memory");
! 48: return -1;
! 49: }
1.1 misho 50: }
51:
52: /* mark state as initialized */
53: state->size = state->want;
54:
1.1.1.2 ! misho 55: /* initialize write buffer if compressing */
! 56: if (!state->direct) {
! 57: strm->avail_out = state->size;
! 58: strm->next_out = state->out;
! 59: state->x.next = strm->next_out;
! 60: }
1.1 misho 61: return 0;
62: }
63:
64: /* Compress whatever is at avail_in and next_in and write to the output file.
65: Return -1 if there is an error writing to the output file, otherwise 0.
66: flush is assumed to be a valid deflate() flush value. If flush is Z_FINISH,
1.1.1.2 ! misho 67: then the deflate() state is reset to start a new gzip stream. If gz->direct
! 68: is true, then simply write to the output file without compressing, and
! 69: ignore flush. */
1.1 misho 70: local int gz_comp(state, flush)
71: gz_statep state;
72: int flush;
73: {
74: int ret, got;
75: unsigned have;
76: z_streamp strm = &(state->strm);
77:
78: /* allocate memory if this is the first time through */
79: if (state->size == 0 && gz_init(state) == -1)
80: return -1;
81:
1.1.1.2 ! misho 82: /* write directly if requested */
! 83: if (state->direct) {
! 84: got = write(state->fd, strm->next_in, strm->avail_in);
! 85: if (got < 0 || (unsigned)got != strm->avail_in) {
! 86: gz_error(state, Z_ERRNO, zstrerror());
! 87: return -1;
! 88: }
! 89: strm->avail_in = 0;
! 90: return 0;
! 91: }
! 92:
1.1 misho 93: /* run deflate() on provided input until it produces no more output */
94: ret = Z_OK;
95: do {
96: /* write out current buffer contents if full, or if flushing, but if
97: doing Z_FINISH then don't write until we get to Z_STREAM_END */
98: if (strm->avail_out == 0 || (flush != Z_NO_FLUSH &&
99: (flush != Z_FINISH || ret == Z_STREAM_END))) {
1.1.1.2 ! misho 100: have = (unsigned)(strm->next_out - state->x.next);
! 101: if (have && ((got = write(state->fd, state->x.next, have)) < 0 ||
1.1 misho 102: (unsigned)got != have)) {
103: gz_error(state, Z_ERRNO, zstrerror());
104: return -1;
105: }
106: if (strm->avail_out == 0) {
107: strm->avail_out = state->size;
108: strm->next_out = state->out;
109: }
1.1.1.2 ! misho 110: state->x.next = strm->next_out;
1.1 misho 111: }
112:
113: /* compress */
114: have = strm->avail_out;
115: ret = deflate(strm, flush);
116: if (ret == Z_STREAM_ERROR) {
117: gz_error(state, Z_STREAM_ERROR,
118: "internal error: deflate stream corrupt");
119: return -1;
120: }
121: have -= strm->avail_out;
122: } while (have);
123:
124: /* if that completed a deflate stream, allow another to start */
125: if (flush == Z_FINISH)
126: deflateReset(strm);
127:
128: /* all done, no errors */
129: return 0;
130: }
131:
132: /* Compress len zeros to output. Return -1 on error, 0 on success. */
133: local int gz_zero(state, len)
134: gz_statep state;
135: z_off64_t len;
136: {
137: int first;
138: unsigned n;
139: z_streamp strm = &(state->strm);
140:
141: /* consume whatever's left in the input buffer */
142: if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
143: return -1;
144:
145: /* compress len zeros (len guaranteed > 0) */
146: first = 1;
147: while (len) {
148: n = GT_OFF(state->size) || (z_off64_t)state->size > len ?
149: (unsigned)len : state->size;
150: if (first) {
151: memset(state->in, 0, n);
152: first = 0;
153: }
154: strm->avail_in = n;
155: strm->next_in = state->in;
1.1.1.2 ! misho 156: state->x.pos += n;
1.1 misho 157: if (gz_comp(state, Z_NO_FLUSH) == -1)
158: return -1;
159: len -= n;
160: }
161: return 0;
162: }
163:
164: /* -- see zlib.h -- */
165: int ZEXPORT gzwrite(file, buf, len)
166: gzFile file;
167: voidpc buf;
168: unsigned len;
169: {
170: unsigned put = len;
171: unsigned n;
172: gz_statep state;
173: z_streamp strm;
174:
175: /* get internal structure */
176: if (file == NULL)
177: return 0;
178: state = (gz_statep)file;
179: strm = &(state->strm);
180:
181: /* check that we're writing and that there's no error */
182: if (state->mode != GZ_WRITE || state->err != Z_OK)
183: return 0;
184:
185: /* since an int is returned, make sure len fits in one, otherwise return
186: with an error (this avoids the flaw in the interface) */
187: if ((int)len < 0) {
1.1.1.2 ! misho 188: gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
1.1 misho 189: return 0;
190: }
191:
192: /* if len is zero, avoid unnecessary operations */
193: if (len == 0)
194: return 0;
195:
196: /* allocate memory if this is the first time through */
197: if (state->size == 0 && gz_init(state) == -1)
198: return 0;
199:
200: /* check for seek request */
201: if (state->seek) {
202: state->seek = 0;
203: if (gz_zero(state, state->skip) == -1)
204: return 0;
205: }
206:
207: /* for small len, copy to input buffer, otherwise compress directly */
208: if (len < state->size) {
209: /* copy to input buffer, compress when full */
210: do {
211: if (strm->avail_in == 0)
212: strm->next_in = state->in;
213: n = state->size - strm->avail_in;
214: if (n > len)
215: n = len;
216: memcpy(strm->next_in + strm->avail_in, buf, n);
217: strm->avail_in += n;
1.1.1.2 ! misho 218: state->x.pos += n;
1.1 misho 219: buf = (char *)buf + n;
220: len -= n;
221: if (len && gz_comp(state, Z_NO_FLUSH) == -1)
222: return 0;
223: } while (len);
224: }
225: else {
226: /* consume whatever's left in the input buffer */
227: if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
228: return 0;
229:
230: /* directly compress user buffer to file */
231: strm->avail_in = len;
232: strm->next_in = (voidp)buf;
1.1.1.2 ! misho 233: state->x.pos += len;
1.1 misho 234: if (gz_comp(state, Z_NO_FLUSH) == -1)
235: return 0;
236: }
237:
238: /* input was all buffered or compressed (put will fit in int) */
239: return (int)put;
240: }
241:
242: /* -- see zlib.h -- */
243: int ZEXPORT gzputc(file, c)
244: gzFile file;
245: int c;
246: {
247: unsigned char buf[1];
248: gz_statep state;
249: z_streamp strm;
250:
251: /* get internal structure */
252: if (file == NULL)
253: return -1;
254: state = (gz_statep)file;
255: strm = &(state->strm);
256:
257: /* check that we're writing and that there's no error */
258: if (state->mode != GZ_WRITE || state->err != Z_OK)
259: return -1;
260:
261: /* check for seek request */
262: if (state->seek) {
263: state->seek = 0;
264: if (gz_zero(state, state->skip) == -1)
265: return -1;
266: }
267:
268: /* try writing to input buffer for speed (state->size == 0 if buffer not
269: initialized) */
270: if (strm->avail_in < state->size) {
271: if (strm->avail_in == 0)
272: strm->next_in = state->in;
273: strm->next_in[strm->avail_in++] = c;
1.1.1.2 ! misho 274: state->x.pos++;
! 275: return c & 0xff;
1.1 misho 276: }
277:
278: /* no room in buffer or not initialized, use gz_write() */
279: buf[0] = c;
280: if (gzwrite(file, buf, 1) != 1)
281: return -1;
1.1.1.2 ! misho 282: return c & 0xff;
1.1 misho 283: }
284:
285: /* -- see zlib.h -- */
286: int ZEXPORT gzputs(file, str)
287: gzFile file;
288: const char *str;
289: {
290: int ret;
291: unsigned len;
292:
293: /* write string */
294: len = (unsigned)strlen(str);
295: ret = gzwrite(file, str, len);
296: return ret == 0 && len != 0 ? -1 : ret;
297: }
298:
1.1.1.2 ! misho 299: #if defined(STDC) || defined(Z_HAVE_STDARG_H)
1.1 misho 300: #include <stdarg.h>
301:
302: /* -- see zlib.h -- */
303: int ZEXPORTVA gzprintf (gzFile file, const char *format, ...)
304: {
305: int size, len;
306: gz_statep state;
307: z_streamp strm;
308: va_list va;
309:
310: /* get internal structure */
311: if (file == NULL)
312: return -1;
313: state = (gz_statep)file;
314: strm = &(state->strm);
315:
316: /* check that we're writing and that there's no error */
317: if (state->mode != GZ_WRITE || state->err != Z_OK)
318: return 0;
319:
320: /* make sure we have some buffer space */
321: if (state->size == 0 && gz_init(state) == -1)
322: return 0;
323:
324: /* check for seek request */
325: if (state->seek) {
326: state->seek = 0;
327: if (gz_zero(state, state->skip) == -1)
328: return 0;
329: }
330:
331: /* consume whatever's left in the input buffer */
332: if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
333: return 0;
334:
335: /* do the printf() into the input buffer, put length in len */
336: size = (int)(state->size);
337: state->in[size - 1] = 0;
338: va_start(va, format);
339: #ifdef NO_vsnprintf
340: # ifdef HAS_vsprintf_void
341: (void)vsprintf(state->in, format, va);
342: va_end(va);
343: for (len = 0; len < size; len++)
344: if (state->in[len] == 0) break;
345: # else
346: len = vsprintf(state->in, format, va);
347: va_end(va);
348: # endif
349: #else
350: # ifdef HAS_vsnprintf_void
351: (void)vsnprintf(state->in, size, format, va);
352: va_end(va);
353: len = strlen(state->in);
354: # else
355: len = vsnprintf((char *)(state->in), size, format, va);
356: va_end(va);
357: # endif
358: #endif
359:
360: /* check that printf() results fit in buffer */
361: if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
362: return 0;
363:
364: /* update buffer and position, defer compression until needed */
365: strm->avail_in = (unsigned)len;
366: strm->next_in = state->in;
1.1.1.2 ! misho 367: state->x.pos += len;
1.1 misho 368: return len;
369: }
370:
1.1.1.2 ! misho 371: #else /* !STDC && !Z_HAVE_STDARG_H */
1.1 misho 372:
373: /* -- see zlib.h -- */
374: int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
375: a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
376: gzFile file;
377: const char *format;
378: int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
379: a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
380: {
381: int size, len;
382: gz_statep state;
383: z_streamp strm;
384:
385: /* get internal structure */
386: if (file == NULL)
387: return -1;
388: state = (gz_statep)file;
389: strm = &(state->strm);
390:
1.1.1.2 ! misho 391: /* check that can really pass pointer in ints */
! 392: if (sizeof(int) != sizeof(void *))
! 393: return 0;
! 394:
1.1 misho 395: /* check that we're writing and that there's no error */
396: if (state->mode != GZ_WRITE || state->err != Z_OK)
397: return 0;
398:
399: /* make sure we have some buffer space */
400: if (state->size == 0 && gz_init(state) == -1)
401: return 0;
402:
403: /* check for seek request */
404: if (state->seek) {
405: state->seek = 0;
406: if (gz_zero(state, state->skip) == -1)
407: return 0;
408: }
409:
410: /* consume whatever's left in the input buffer */
411: if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
412: return 0;
413:
414: /* do the printf() into the input buffer, put length in len */
415: size = (int)(state->size);
416: state->in[size - 1] = 0;
417: #ifdef NO_snprintf
418: # ifdef HAS_sprintf_void
419: sprintf(state->in, format, a1, a2, a3, a4, a5, a6, a7, a8,
420: a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
421: for (len = 0; len < size; len++)
422: if (state->in[len] == 0) break;
423: # else
424: len = sprintf(state->in, format, a1, a2, a3, a4, a5, a6, a7, a8,
425: a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
426: # endif
427: #else
428: # ifdef HAS_snprintf_void
429: snprintf(state->in, size, format, a1, a2, a3, a4, a5, a6, a7, a8,
430: a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
431: len = strlen(state->in);
432: # else
433: len = snprintf(state->in, size, format, a1, a2, a3, a4, a5, a6, a7, a8,
434: a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
435: # endif
436: #endif
437:
438: /* check that printf() results fit in buffer */
439: if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
440: return 0;
441:
442: /* update buffer and position, defer compression until needed */
443: strm->avail_in = (unsigned)len;
444: strm->next_in = state->in;
1.1.1.2 ! misho 445: state->x.pos += len;
1.1 misho 446: return len;
447: }
448:
449: #endif
450:
451: /* -- see zlib.h -- */
452: int ZEXPORT gzflush(file, flush)
453: gzFile file;
454: int flush;
455: {
456: gz_statep state;
457:
458: /* get internal structure */
459: if (file == NULL)
460: return -1;
461: state = (gz_statep)file;
462:
463: /* check that we're writing and that there's no error */
464: if (state->mode != GZ_WRITE || state->err != Z_OK)
465: return Z_STREAM_ERROR;
466:
467: /* check flush parameter */
468: if (flush < 0 || flush > Z_FINISH)
469: return Z_STREAM_ERROR;
470:
471: /* check for seek request */
472: if (state->seek) {
473: state->seek = 0;
474: if (gz_zero(state, state->skip) == -1)
475: return -1;
476: }
477:
478: /* compress remaining data with requested flush */
479: gz_comp(state, flush);
480: return state->err;
481: }
482:
483: /* -- see zlib.h -- */
484: int ZEXPORT gzsetparams(file, level, strategy)
485: gzFile file;
486: int level;
487: int strategy;
488: {
489: gz_statep state;
490: z_streamp strm;
491:
492: /* get internal structure */
493: if (file == NULL)
494: return Z_STREAM_ERROR;
495: state = (gz_statep)file;
496: strm = &(state->strm);
497:
498: /* check that we're writing and that there's no error */
499: if (state->mode != GZ_WRITE || state->err != Z_OK)
500: return Z_STREAM_ERROR;
501:
502: /* if no change is requested, then do nothing */
503: if (level == state->level && strategy == state->strategy)
504: return Z_OK;
505:
506: /* check for seek request */
507: if (state->seek) {
508: state->seek = 0;
509: if (gz_zero(state, state->skip) == -1)
510: return -1;
511: }
512:
513: /* change compression parameters for subsequent input */
514: if (state->size) {
515: /* flush previous input with previous parameters before changing */
516: if (strm->avail_in && gz_comp(state, Z_PARTIAL_FLUSH) == -1)
517: return state->err;
518: deflateParams(strm, level, strategy);
519: }
520: state->level = level;
521: state->strategy = strategy;
522: return Z_OK;
523: }
524:
525: /* -- see zlib.h -- */
526: int ZEXPORT gzclose_w(file)
527: gzFile file;
528: {
1.1.1.2 ! misho 529: int ret = Z_OK;
1.1 misho 530: gz_statep state;
531:
532: /* get internal structure */
533: if (file == NULL)
534: return Z_STREAM_ERROR;
535: state = (gz_statep)file;
536:
537: /* check that we're writing */
538: if (state->mode != GZ_WRITE)
539: return Z_STREAM_ERROR;
540:
541: /* check for seek request */
542: if (state->seek) {
543: state->seek = 0;
1.1.1.2 ! misho 544: if (gz_zero(state, state->skip) == -1)
! 545: ret = state->err;
1.1 misho 546: }
547:
548: /* flush, free memory, and close file */
1.1.1.2 ! misho 549: if (gz_comp(state, Z_FINISH) == -1)
! 550: ret = state->err;
! 551: if (!state->direct) {
! 552: (void)deflateEnd(&(state->strm));
! 553: free(state->out);
! 554: }
1.1 misho 555: free(state->in);
556: gz_error(state, Z_OK, NULL);
557: free(state->path);
1.1.1.2 ! misho 558: if (close(state->fd) == -1)
! 559: ret = Z_ERRNO;
1.1 misho 560: free(state);
1.1.1.2 ! misho 561: return ret;
! 562: }
! 563:
! 564: /* used by zlibVersion() to get the vsnprintf story from the horse's mouth */
! 565: unsigned long ZEXPORT gzflags()
! 566: {
! 567: unsigned long flags = 0;
! 568: #if defined(STDC) || defined(Z_HAVE_STDARG_H)
! 569: # ifdef NO_vsnprintf
! 570: flags += 1L << 25;
! 571: # ifdef HAS_vsprintf_void
! 572: flags += 1L << 26;
! 573: # endif
! 574: # else
! 575: # ifdef HAS_vsnprintf_void
! 576: flags += 1L << 26;
! 577: # endif
! 578: # endif
! 579: #else
! 580: flags += 1L << 24;
! 581: # ifdef NO_snprintf
! 582: flags += 1L << 25;
! 583: # ifdef HAS_sprintf_void
! 584: flags += 1L << 26;
! 585: # endif
! 586: # else
! 587: # ifdef HAS_snprintf_void
! 588: flags += 1L << 26;
! 589: # endif
! 590: # endif
! 591: #endif
! 592: return flags;
1.1 misho 593: }
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