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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