1: /*
2: +----------------------------------------------------------------------+
3: | PHP Version 5 |
4: +----------------------------------------------------------------------+
5: | Copyright (c) 1997-2012 The PHP Group |
6: +----------------------------------------------------------------------+
7: | This source file is subject to version 3.01 of the PHP license, |
8: | that is bundled with this package in the file LICENSE, and is |
9: | available through the world-wide-web at the following url: |
10: | http://www.php.net/license/3_01.txt |
11: | If you did not receive a copy of the PHP license and are unable to |
12: | obtain it through the world-wide-web, please send a note to |
13: | license@php.net so we can mail you a copy immediately. |
14: +----------------------------------------------------------------------+
15: | Authors: Sara Golemon (pollita@php.net) |
16: +----------------------------------------------------------------------+
17: */
18:
19: /* $Id: zlib_filter.c,v 1.1.1.2 2012/05/29 12:34:37 misho Exp $ */
20:
21: #include "php.h"
22: #include "php_zlib.h"
23:
24: /* {{{ data structure */
25:
26: /* Passed as opaque in malloc callbacks */
27: typedef struct _php_zlib_filter_data {
28: int persistent;
29: z_stream strm;
30: char *inbuf;
31: size_t inbuf_len;
32: char *outbuf;
33: size_t outbuf_len;
34: zend_bool finished;
35: } php_zlib_filter_data;
36:
37: /* }}} */
38:
39: /* {{{ Memory management wrappers */
40:
41: static voidpf php_zlib_alloc(voidpf opaque, uInt items, uInt size)
42: {
43: return (voidpf)safe_pemalloc(items, size, 0, ((php_zlib_filter_data*)opaque)->persistent);
44: }
45:
46: static void php_zlib_free(voidpf opaque, voidpf address)
47: {
48: pefree((void*)address, ((php_zlib_filter_data*)opaque)->persistent);
49: }
50: /* }}} */
51:
52: /* {{{ zlib.inflate filter implementation */
53:
54: static php_stream_filter_status_t php_zlib_inflate_filter(
55: php_stream *stream,
56: php_stream_filter *thisfilter,
57: php_stream_bucket_brigade *buckets_in,
58: php_stream_bucket_brigade *buckets_out,
59: size_t *bytes_consumed,
60: int flags
61: TSRMLS_DC)
62: {
63: php_zlib_filter_data *data;
64: php_stream_bucket *bucket;
65: size_t consumed = 0, original_out, original_in;
66: int status;
67: php_stream_filter_status_t exit_status = PSFS_FEED_ME;
68: z_stream *streamp;
69:
70: if (!thisfilter || !thisfilter->abstract) {
71: /* Should never happen */
72: return PSFS_ERR_FATAL;
73: }
74:
75: data = (php_zlib_filter_data *)(thisfilter->abstract);
76: streamp = &(data->strm);
77: original_in = data->strm.total_in;
78: original_out = data->strm.total_out;
79:
80: while (buckets_in->head) {
81: size_t bin = 0, desired;
82:
83: bucket = buckets_in->head;
84:
85: bucket = php_stream_bucket_make_writeable(buckets_in->head TSRMLS_CC);
86:
87: while (bin < (unsigned int) bucket->buflen) {
88:
89: if (data->finished) {
90: consumed += bucket->buflen;
91: break;
92: }
93:
94: desired = bucket->buflen - bin;
95: if (desired > data->inbuf_len) {
96: desired = data->inbuf_len;
97: }
98: memcpy(data->strm.next_in, bucket->buf + bin, desired);
99: data->strm.avail_in = desired;
100:
101: status = inflate(&(data->strm), flags & PSFS_FLAG_FLUSH_CLOSE ? Z_FINISH : Z_SYNC_FLUSH);
102: if (status == Z_STREAM_END) {
103: inflateEnd(&(data->strm));
104: data->finished = '\1';
105: } else if (status != Z_OK) {
106: /* Something bad happened */
107: php_stream_bucket_delref(bucket TSRMLS_CC);
108: /* reset these because despite the error the filter may be used again */
109: data->strm.next_in = data->inbuf;
110: data->strm.avail_in = 0;
111: return PSFS_ERR_FATAL;
112: }
113: desired -= data->strm.avail_in; /* desired becomes what we consumed this round through */
114: data->strm.next_in = data->inbuf;
115: data->strm.avail_in = 0;
116: bin += desired;
117:
118: if (data->strm.avail_out < data->outbuf_len) {
119: php_stream_bucket *out_bucket;
120: size_t bucketlen = data->outbuf_len - data->strm.avail_out;
121: out_bucket = php_stream_bucket_new(stream, estrndup(data->outbuf, bucketlen), bucketlen, 1, 0 TSRMLS_CC);
122: php_stream_bucket_append(buckets_out, out_bucket TSRMLS_CC);
123: data->strm.avail_out = data->outbuf_len;
124: data->strm.next_out = data->outbuf;
125: exit_status = PSFS_PASS_ON;
126: } else if (status == Z_STREAM_END && data->strm.avail_out >= data->outbuf_len) {
127: /* no more data to decompress, and nothing was spat out */
128: php_stream_bucket_delref(bucket TSRMLS_CC);
129: return PSFS_PASS_ON;
130: }
131:
132: }
133: consumed += bucket->buflen;
134: php_stream_bucket_delref(bucket TSRMLS_CC);
135: }
136:
137: if (!data->finished && flags & PSFS_FLAG_FLUSH_CLOSE) {
138: /* Spit it out! */
139: status = Z_OK;
140: while (status == Z_OK) {
141: status = inflate(&(data->strm), Z_FINISH);
142: if (data->strm.avail_out < data->outbuf_len) {
143: size_t bucketlen = data->outbuf_len - data->strm.avail_out;
144:
145: bucket = php_stream_bucket_new(stream, estrndup(data->outbuf, bucketlen), bucketlen, 1, 0 TSRMLS_CC);
146: php_stream_bucket_append(buckets_out, bucket TSRMLS_CC);
147: data->strm.avail_out = data->outbuf_len;
148: data->strm.next_out = data->outbuf;
149: exit_status = PSFS_PASS_ON;
150: }
151: }
152: }
153:
154: if (bytes_consumed) {
155: *bytes_consumed = consumed;
156: }
157:
158: return exit_status;
159: }
160:
161: static void php_zlib_inflate_dtor(php_stream_filter *thisfilter TSRMLS_DC)
162: {
163: if (thisfilter && thisfilter->abstract) {
164: php_zlib_filter_data *data = thisfilter->abstract;
165: if (!data->finished) {
166: inflateEnd(&(data->strm));
167: }
168: pefree(data->inbuf, data->persistent);
169: pefree(data->outbuf, data->persistent);
170: pefree(data, data->persistent);
171: }
172: }
173:
174: static php_stream_filter_ops php_zlib_inflate_ops = {
175: php_zlib_inflate_filter,
176: php_zlib_inflate_dtor,
177: "zlib.inflate"
178: };
179: /* }}} */
180:
181: /* {{{ zlib.inflate filter implementation */
182:
183: static php_stream_filter_status_t php_zlib_deflate_filter(
184: php_stream *stream,
185: php_stream_filter *thisfilter,
186: php_stream_bucket_brigade *buckets_in,
187: php_stream_bucket_brigade *buckets_out,
188: size_t *bytes_consumed,
189: int flags
190: TSRMLS_DC)
191: {
192: php_zlib_filter_data *data;
193: php_stream_bucket *bucket;
194: size_t consumed = 0, original_out, original_in;
195: int status;
196: php_stream_filter_status_t exit_status = PSFS_FEED_ME;
197: z_stream *streamp;
198:
199: if (!thisfilter || !thisfilter->abstract) {
200: /* Should never happen */
201: return PSFS_ERR_FATAL;
202: }
203:
204: data = (php_zlib_filter_data *)(thisfilter->abstract);
205: streamp = &(data->strm);
206: original_in = data->strm.total_in;
207: original_out = data->strm.total_out;
208:
209: while (buckets_in->head) {
210: size_t bin = 0, desired;
211:
212: bucket = buckets_in->head;
213:
214: bucket = php_stream_bucket_make_writeable(bucket TSRMLS_CC);
215:
216: while (bin < (unsigned int) bucket->buflen) {
217: desired = bucket->buflen - bin;
218: if (desired > data->inbuf_len) {
219: desired = data->inbuf_len;
220: }
221: memcpy(data->strm.next_in, bucket->buf + bin, desired);
222: data->strm.avail_in = desired;
223:
224: status = deflate(&(data->strm), flags & PSFS_FLAG_FLUSH_CLOSE ? Z_FULL_FLUSH : (flags & PSFS_FLAG_FLUSH_INC ? Z_SYNC_FLUSH : Z_NO_FLUSH));
225: if (status != Z_OK) {
226: /* Something bad happened */
227: php_stream_bucket_delref(bucket TSRMLS_CC);
228: return PSFS_ERR_FATAL;
229: }
230: desired -= data->strm.avail_in; /* desired becomes what we consumed this round through */
231: data->strm.next_in = data->inbuf;
232: data->strm.avail_in = 0;
233: bin += desired;
234:
235: if (data->strm.avail_out < data->outbuf_len) {
236: php_stream_bucket *out_bucket;
237: size_t bucketlen = data->outbuf_len - data->strm.avail_out;
238:
239: out_bucket = php_stream_bucket_new(stream, estrndup(data->outbuf, bucketlen), bucketlen, 1, 0 TSRMLS_CC);
240: php_stream_bucket_append(buckets_out, out_bucket TSRMLS_CC);
241: data->strm.avail_out = data->outbuf_len;
242: data->strm.next_out = data->outbuf;
243: exit_status = PSFS_PASS_ON;
244: }
245: }
246: consumed += bucket->buflen;
247: php_stream_bucket_delref(bucket TSRMLS_CC);
248: }
249:
250: if (flags & PSFS_FLAG_FLUSH_CLOSE) {
251: /* Spit it out! */
252: status = Z_OK;
253: while (status == Z_OK) {
254: status = deflate(&(data->strm), Z_FINISH);
255: if (data->strm.avail_out < data->outbuf_len) {
256: size_t bucketlen = data->outbuf_len - data->strm.avail_out;
257:
258: bucket = php_stream_bucket_new(stream, estrndup(data->outbuf, bucketlen), bucketlen, 1, 0 TSRMLS_CC);
259: php_stream_bucket_append(buckets_out, bucket TSRMLS_CC);
260: data->strm.avail_out = data->outbuf_len;
261: data->strm.next_out = data->outbuf;
262: exit_status = PSFS_PASS_ON;
263: }
264: }
265: }
266:
267: if (bytes_consumed) {
268: *bytes_consumed = consumed;
269: }
270:
271: return exit_status;
272: }
273:
274: static void php_zlib_deflate_dtor(php_stream_filter *thisfilter TSRMLS_DC)
275: {
276: if (thisfilter && thisfilter->abstract) {
277: php_zlib_filter_data *data = thisfilter->abstract;
278: deflateEnd(&(data->strm));
279: pefree(data->inbuf, data->persistent);
280: pefree(data->outbuf, data->persistent);
281: pefree(data, data->persistent);
282: }
283: }
284:
285: static php_stream_filter_ops php_zlib_deflate_ops = {
286: php_zlib_deflate_filter,
287: php_zlib_deflate_dtor,
288: "zlib.deflate"
289: };
290:
291: /* }}} */
292:
293: /* {{{ zlib.* common factory */
294:
295: static php_stream_filter *php_zlib_filter_create(const char *filtername, zval *filterparams, int persistent TSRMLS_DC)
296: {
297: php_stream_filter_ops *fops = NULL;
298: php_zlib_filter_data *data;
299: int status;
300:
301: /* Create this filter */
302: data = pecalloc(1, sizeof(php_zlib_filter_data), persistent);
303: if (!data) {
304: php_error_docref(NULL TSRMLS_CC, E_WARNING, "Failed allocating %zd bytes", sizeof(php_zlib_filter_data));
305: return NULL;
306: }
307:
308: /* Circular reference */
309: data->strm.opaque = (voidpf) data;
310:
311: data->strm.zalloc = (alloc_func) php_zlib_alloc;
312: data->strm.zfree = (free_func) php_zlib_free;
313: data->strm.avail_out = data->outbuf_len = data->inbuf_len = 2048;
314: data->strm.next_in = data->inbuf = (Bytef *) pemalloc(data->inbuf_len, persistent);
315: if (!data->inbuf) {
316: php_error_docref(NULL TSRMLS_CC, E_WARNING, "Failed allocating %zd bytes", data->inbuf_len);
317: pefree(data, persistent);
318: return NULL;
319: }
320: data->strm.avail_in = 0;
321: data->strm.next_out = data->outbuf = (Bytef *) pemalloc(data->outbuf_len, persistent);
322: if (!data->outbuf) {
323: php_error_docref(NULL TSRMLS_CC, E_WARNING, "Failed allocating %zd bytes", data->outbuf_len);
324: pefree(data->inbuf, persistent);
325: pefree(data, persistent);
326: return NULL;
327: }
328:
329: data->strm.data_type = Z_ASCII;
330:
331: if (strcasecmp(filtername, "zlib.inflate") == 0) {
332: int windowBits = -MAX_WBITS;
333:
334: if (filterparams) {
335: zval **tmpzval;
336:
337: if ((Z_TYPE_P(filterparams) == IS_ARRAY || Z_TYPE_P(filterparams) == IS_OBJECT) &&
338: zend_hash_find(HASH_OF(filterparams), "window", sizeof("window"), (void **) &tmpzval) == SUCCESS) {
339: zval tmp;
340:
341: /* log-2 base of history window (9 - 15) */
342: tmp = **tmpzval;
343: zval_copy_ctor(&tmp);
344: convert_to_long(&tmp);
345: if (Z_LVAL(tmp) < -MAX_WBITS || Z_LVAL(tmp) > MAX_WBITS + 32) {
346: php_error_docref(NULL TSRMLS_CC, E_WARNING, "Invalid parameter give for window size. (%ld)", Z_LVAL(tmp));
347: } else {
348: windowBits = Z_LVAL(tmp);
349: }
350: }
351: }
352:
353: /* RFC 1951 Inflate */
354: data->finished = '\0';
355: status = inflateInit2(&(data->strm), windowBits);
356: fops = &php_zlib_inflate_ops;
357: } else if (strcasecmp(filtername, "zlib.deflate") == 0) {
358: /* RFC 1951 Deflate */
359: int level = Z_DEFAULT_COMPRESSION;
360: int windowBits = -MAX_WBITS;
361: int memLevel = MAX_MEM_LEVEL;
362:
363:
364: if (filterparams) {
365: zval **tmpzval, tmp;
366:
367: /* filterparams can either be a scalar value to indicate compression level (shortcut method)
368: Or can be a hash containing one or more of 'window', 'memory', and/or 'level' members. */
369:
370: switch (Z_TYPE_P(filterparams)) {
371: case IS_ARRAY:
372: case IS_OBJECT:
373: if (zend_hash_find(HASH_OF(filterparams), "memory", sizeof("memory"), (void**) &tmpzval) == SUCCESS) {
374: tmp = **tmpzval;
375: zval_copy_ctor(&tmp);
376: convert_to_long(&tmp);
377:
378: /* Memory Level (1 - 9) */
379: if (Z_LVAL(tmp) < 1 || Z_LVAL(tmp) > MAX_MEM_LEVEL) {
380: php_error_docref(NULL TSRMLS_CC, E_WARNING, "Invalid parameter give for memory level. (%ld)", Z_LVAL(tmp));
381: } else {
382: memLevel = Z_LVAL(tmp);
383: }
384: }
385:
386: if (zend_hash_find(HASH_OF(filterparams), "window", sizeof("window"), (void**) &tmpzval) == SUCCESS) {
387: tmp = **tmpzval;
388: zval_copy_ctor(&tmp);
389: convert_to_long(&tmp);
390:
391: /* log-2 base of history window (9 - 15) */
392: if (Z_LVAL(tmp) < -MAX_WBITS || Z_LVAL(tmp) > MAX_WBITS + 16) {
393: php_error_docref(NULL TSRMLS_CC, E_WARNING, "Invalid parameter give for window size. (%ld)", Z_LVAL(tmp));
394: } else {
395: windowBits = Z_LVAL(tmp);
396: }
397: }
398:
399: if (zend_hash_find(HASH_OF(filterparams), "level", sizeof("level"), (void**) &tmpzval) == SUCCESS) {
400: tmp = **tmpzval;
401:
402: /* Psuedo pass through to catch level validating code */
403: goto factory_setlevel;
404: }
405: break;
406: case IS_STRING:
407: case IS_DOUBLE:
408: case IS_LONG:
409: tmp = *filterparams;
410: factory_setlevel:
411: zval_copy_ctor(&tmp);
412: convert_to_long(&tmp);
413:
414: /* Set compression level within reason (-1 == default, 0 == none, 1-9 == least to most compression */
415: if (Z_LVAL(tmp) < -1 || Z_LVAL(tmp) > 9) {
416: php_error_docref(NULL TSRMLS_CC, E_WARNING, "Invalid compression level specified. (%ld)", Z_LVAL(tmp));
417: } else {
418: level = Z_LVAL(tmp);
419: }
420: break;
421: default:
422: php_error_docref(NULL TSRMLS_CC, E_WARNING, "Invalid filter parameter, ignored");
423: }
424: }
425: status = deflateInit2(&(data->strm), level, Z_DEFLATED, windowBits, memLevel, 0);
426: fops = &php_zlib_deflate_ops;
427: } else {
428: status = Z_DATA_ERROR;
429: }
430:
431: if (status != Z_OK) {
432: /* Unspecified (probably strm) error, let stream-filter error do its own whining */
433: pefree(data->strm.next_in, persistent);
434: pefree(data->strm.next_out, persistent);
435: pefree(data, persistent);
436: return NULL;
437: }
438:
439: return php_stream_filter_alloc(fops, data, persistent);
440: }
441:
442: php_stream_filter_factory php_zlib_filter_factory = {
443: php_zlib_filter_create
444: };
445: /* }}} */
446:
447: /*
448: * Local variables:
449: * tab-width: 4
450: * c-basic-offset: 4
451: * End:
452: * vim600: sw=4 ts=4 fdm=marker
453: * vim<600: sw=4 ts=4
454: */
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