Annotation of embedaddon/php/main/streams/cast.c, revision 1.1.1.4
1.1 misho 1: /*
2: +----------------------------------------------------------------------+
3: | PHP Version 5 |
4: +----------------------------------------------------------------------+
1.1.1.3 misho 5: | Copyright (c) 1997-2013 The PHP Group |
1.1 misho 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: Wez Furlong <wez@thebrainroom.com> |
16: +----------------------------------------------------------------------+
17: */
18:
1.1.1.2 misho 19: /* $Id$ */
1.1 misho 20:
21: #define _GNU_SOURCE
22: #include "php.h"
23: #include "php_globals.h"
24: #include "php_network.h"
25: #include "php_open_temporary_file.h"
26: #include "ext/standard/file.h"
27: #include <stddef.h>
28: #include <fcntl.h>
29:
30: #include "php_streams_int.h"
31:
32: /* Under BSD, emulate fopencookie using funopen */
33: #if defined(HAVE_FUNOPEN) && !defined(HAVE_FOPENCOOKIE)
1.1.1.3 misho 34:
35: /* NetBSD 6.0+ uses off_t instead of fpos_t in funopen */
1.1.1.4 ! misho 36: # if defined(__NetBSD__) && (__NetBSD_Version__ >= 600000000)
1.1.1.3 misho 37: # define PHP_FPOS_T off_t
38: # else
39: # define PHP_FPOS_T fpos_t
40: # endif
41:
1.1 misho 42: typedef struct {
43: int (*reader)(void *, char *, int);
44: int (*writer)(void *, const char *, int);
1.1.1.3 misho 45: PHP_FPOS_T (*seeker)(void *, PHP_FPOS_T, int);
1.1 misho 46: int (*closer)(void *);
47: } COOKIE_IO_FUNCTIONS_T;
48:
49: FILE *fopencookie(void *cookie, const char *mode, COOKIE_IO_FUNCTIONS_T *funcs)
50: {
51: return funopen(cookie, funcs->reader, funcs->writer, funcs->seeker, funcs->closer);
52: }
53: # define HAVE_FOPENCOOKIE 1
54: # define PHP_EMULATE_FOPENCOOKIE 1
55: # define PHP_STREAM_COOKIE_FUNCTIONS &stream_cookie_functions
56: #elif defined(HAVE_FOPENCOOKIE)
57: # define PHP_STREAM_COOKIE_FUNCTIONS stream_cookie_functions
58: #endif
59:
60: /* {{{ STDIO with fopencookie */
61: #if defined(PHP_EMULATE_FOPENCOOKIE)
62: /* use our fopencookie emulation */
63: static int stream_cookie_reader(void *cookie, char *buffer, int size)
64: {
65: int ret;
66: TSRMLS_FETCH();
67:
68: ret = php_stream_read((php_stream*)cookie, buffer, size);
69: return ret;
70: }
71:
72: static int stream_cookie_writer(void *cookie, const char *buffer, int size)
73: {
74: TSRMLS_FETCH();
75:
76: return php_stream_write((php_stream *)cookie, (char *)buffer, size);
77: }
78:
1.1.1.3 misho 79: static PHP_FPOS_T stream_cookie_seeker(void *cookie, off_t position, int whence)
1.1 misho 80: {
81: TSRMLS_FETCH();
82:
1.1.1.3 misho 83: return (PHP_FPOS_T)php_stream_seek((php_stream *)cookie, position, whence);
1.1 misho 84: }
85:
86: static int stream_cookie_closer(void *cookie)
87: {
88: php_stream *stream = (php_stream*)cookie;
89: TSRMLS_FETCH();
90:
91: /* prevent recursion */
92: stream->fclose_stdiocast = PHP_STREAM_FCLOSE_NONE;
93: return php_stream_close(stream);
94: }
95: #elif defined(HAVE_FOPENCOOKIE)
96: static ssize_t stream_cookie_reader(void *cookie, char *buffer, size_t size)
97: {
98: ssize_t ret;
99: TSRMLS_FETCH();
100:
101: ret = php_stream_read(((php_stream *)cookie), buffer, size);
102: return ret;
103: }
104:
105: static ssize_t stream_cookie_writer(void *cookie, const char *buffer, size_t size)
106: {
107: TSRMLS_FETCH();
108:
109: return php_stream_write(((php_stream *)cookie), (char *)buffer, size);
110: }
111:
112: # ifdef COOKIE_SEEKER_USES_OFF64_T
113: static int stream_cookie_seeker(void *cookie, __off64_t *position, int whence)
114: {
115: TSRMLS_FETCH();
116:
117: *position = php_stream_seek((php_stream *)cookie, (off_t)*position, whence);
118:
119: if (*position == -1) {
120: return -1;
121: }
122: return 0;
123: }
124: # else
125: static int stream_cookie_seeker(void *cookie, off_t position, int whence)
126: {
127: TSRMLS_FETCH();
128:
129: return php_stream_seek((php_stream *)cookie, position, whence);
130: }
131: # endif
132:
133: static int stream_cookie_closer(void *cookie)
134: {
135: php_stream *stream = (php_stream*)cookie;
136: TSRMLS_FETCH();
137:
138: /* prevent recursion */
139: stream->fclose_stdiocast = PHP_STREAM_FCLOSE_NONE;
140: return php_stream_close(stream);
141: }
142: #endif /* elif defined(HAVE_FOPENCOOKIE) */
143:
144: #if HAVE_FOPENCOOKIE
145: static COOKIE_IO_FUNCTIONS_T stream_cookie_functions =
146: {
147: stream_cookie_reader, stream_cookie_writer,
148: stream_cookie_seeker, stream_cookie_closer
149: };
150: #else
151: /* TODO: use socketpair() to emulate fopencookie, as suggested by Hartmut ? */
152: #endif
153: /* }}} */
154:
155: /* {{{ php_stream_mode_sanitize_fdopen_fopencookie
156: * Result should have at least size 5, e.g. to write wbx+\0 */
157: void php_stream_mode_sanitize_fdopen_fopencookie(php_stream *stream, char *result)
158: {
159: /* replace modes not supported by fdopen and fopencookie, but supported
160: * by PHP's fread(), so that their calls won't fail */
161: const char *cur_mode = stream->mode;
162: int has_plus = 0,
163: has_bin = 0,
164: i,
165: res_curs = 0;
166:
167: if (cur_mode[0] == 'r' || cur_mode[0] == 'w' || cur_mode[0] == 'a') {
168: result[res_curs++] = cur_mode[0];
169: } else {
170: /* assume cur_mode[0] is 'c' or 'x'; substitute by 'w', which should not
171: * truncate anything in fdopen/fopencookie */
172: result[res_curs++] = 'w';
173:
174: /* x is allowed (at least by glibc & compat), but not as the 1st mode
175: * as in PHP and in any case is (at best) ignored by fdopen and fopencookie */
176: }
177:
178: /* assume current mode has at most length 4 (e.g. wbn+) */
179: for (i = 1; i < 4 && cur_mode[i] != '\0'; i++) {
180: if (cur_mode[i] == 'b') {
181: has_bin = 1;
182: } else if (cur_mode[i] == '+') {
183: has_plus = 1;
184: }
185: /* ignore 'n', 't' or other stuff */
186: }
187:
188: if (has_bin) {
189: result[res_curs++] = 'b';
190: }
191: if (has_plus) {
192: result[res_curs++] = '+';
193: }
194:
195: result[res_curs] = '\0';
196: }
197: /* }}} */
198:
199: /* {{{ php_stream_cast */
200: PHPAPI int _php_stream_cast(php_stream *stream, int castas, void **ret, int show_err TSRMLS_DC)
201: {
202: int flags = castas & PHP_STREAM_CAST_MASK;
203: castas &= ~PHP_STREAM_CAST_MASK;
204:
205: /* synchronize our buffer (if possible) */
206: if (ret && castas != PHP_STREAM_AS_FD_FOR_SELECT) {
207: php_stream_flush(stream);
208: if (stream->ops->seek && (stream->flags & PHP_STREAM_FLAG_NO_SEEK) == 0) {
209: off_t dummy;
210:
211: stream->ops->seek(stream, stream->position, SEEK_SET, &dummy TSRMLS_CC);
212: stream->readpos = stream->writepos = 0;
213: }
214: }
215:
216: /* filtered streams can only be cast as stdio, and only when fopencookie is present */
217:
218: if (castas == PHP_STREAM_AS_STDIO) {
219: if (stream->stdiocast) {
220: if (ret) {
221: *(FILE**)ret = stream->stdiocast;
222: }
223: goto exit_success;
224: }
225:
226: /* if the stream is a stdio stream let's give it a chance to respond
227: * first, to avoid doubling up the layers of stdio with an fopencookie */
228: if (php_stream_is(stream, PHP_STREAM_IS_STDIO) &&
229: stream->ops->cast &&
230: !php_stream_is_filtered(stream) &&
231: stream->ops->cast(stream, castas, ret TSRMLS_CC) == SUCCESS
232: ) {
233: goto exit_success;
234: }
235:
236: #if HAVE_FOPENCOOKIE
237: /* if just checking, say yes we can be a FILE*, but don't actually create it yet */
238: if (ret == NULL) {
239: goto exit_success;
240: }
241:
242: {
243: char fixed_mode[5];
244: php_stream_mode_sanitize_fdopen_fopencookie(stream, fixed_mode);
245: *(FILE**)ret = fopencookie(stream, fixed_mode, PHP_STREAM_COOKIE_FUNCTIONS);
246: }
247:
248: if (*ret != NULL) {
249: off_t pos;
250:
251: stream->fclose_stdiocast = PHP_STREAM_FCLOSE_FOPENCOOKIE;
252:
253: /* If the stream position is not at the start, we need to force
254: * the stdio layer to believe it's real location. */
255: pos = php_stream_tell(stream);
256: if (pos > 0) {
257: fseek(*ret, pos, SEEK_SET);
258: }
259:
260: goto exit_success;
261: }
262:
263: /* must be either:
264: a) programmer error
265: b) no memory
266: -> lets bail
267: */
268: php_error_docref(NULL TSRMLS_CC, E_ERROR, "fopencookie failed");
269: return FAILURE;
270: #endif
271:
272: if (!php_stream_is_filtered(stream) && stream->ops->cast && stream->ops->cast(stream, castas, NULL TSRMLS_CC) == SUCCESS) {
273: if (FAILURE == stream->ops->cast(stream, castas, ret TSRMLS_CC)) {
274: return FAILURE;
275: }
276: goto exit_success;
277: } else if (flags & PHP_STREAM_CAST_TRY_HARD) {
278: php_stream *newstream;
279:
280: newstream = php_stream_fopen_tmpfile();
281: if (newstream) {
1.1.1.2 misho 282: int retcopy = php_stream_copy_to_stream_ex(stream, newstream, PHP_STREAM_COPY_ALL, NULL);
1.1 misho 283:
284: if (retcopy != SUCCESS) {
285: php_stream_close(newstream);
286: } else {
287: int retcast = php_stream_cast(newstream, castas | flags, (void **)ret, show_err);
288:
289: if (retcast == SUCCESS) {
290: rewind(*(FILE**)ret);
291: }
292:
293: /* do some specialized cleanup */
294: if ((flags & PHP_STREAM_CAST_RELEASE)) {
295: php_stream_free(stream, PHP_STREAM_FREE_CLOSE_CASTED);
296: }
297:
298: /* TODO: we probably should be setting .stdiocast and .fclose_stdiocast or
299: * we may be leaking the FILE*. Needs investigation, though. */
300: return retcast;
301: }
302: }
303: }
304: }
305:
306: if (php_stream_is_filtered(stream)) {
307: php_error_docref(NULL TSRMLS_CC, E_WARNING, "cannot cast a filtered stream on this system");
308: return FAILURE;
309: } else if (stream->ops->cast && stream->ops->cast(stream, castas, ret TSRMLS_CC) == SUCCESS) {
310: goto exit_success;
311: }
312:
313: if (show_err) {
314: /* these names depend on the values of the PHP_STREAM_AS_XXX defines in php_streams.h */
315: static const char *cast_names[4] = {
316: "STDIO FILE*",
317: "File Descriptor",
318: "Socket Descriptor",
319: "select()able descriptor"
320: };
321:
322: php_error_docref(NULL TSRMLS_CC, E_WARNING, "cannot represent a stream of type %s as a %s", stream->ops->label, cast_names[castas]);
323: }
324:
325: return FAILURE;
326:
327: exit_success:
328:
329: if ((stream->writepos - stream->readpos) > 0 &&
330: stream->fclose_stdiocast != PHP_STREAM_FCLOSE_FOPENCOOKIE &&
331: (flags & PHP_STREAM_CAST_INTERNAL) == 0
332: ) {
333: /* the data we have buffered will be lost to the third party library that
334: * will be accessing the stream. Emit a warning so that the end-user will
335: * know that they should try something else */
336:
337: php_error_docref(NULL TSRMLS_CC, E_WARNING, "%ld bytes of buffered data lost during stream conversion!", (long)(stream->writepos - stream->readpos));
338: }
339:
340: if (castas == PHP_STREAM_AS_STDIO && ret) {
341: stream->stdiocast = *(FILE**)ret;
342: }
343:
344: if (flags & PHP_STREAM_CAST_RELEASE) {
345: php_stream_free(stream, PHP_STREAM_FREE_CLOSE_CASTED);
346: }
347:
348: return SUCCESS;
349:
350: }
351: /* }}} */
352:
353: /* {{{ php_stream_open_wrapper_as_file */
354: PHPAPI FILE * _php_stream_open_wrapper_as_file(char *path, char *mode, int options, char **opened_path STREAMS_DC TSRMLS_DC)
355: {
356: FILE *fp = NULL;
357: php_stream *stream = NULL;
358:
359: stream = php_stream_open_wrapper_rel(path, mode, options|STREAM_WILL_CAST, opened_path);
360:
361: if (stream == NULL) {
362: return NULL;
363: }
364:
365: if (php_stream_cast(stream, PHP_STREAM_AS_STDIO|PHP_STREAM_CAST_TRY_HARD|PHP_STREAM_CAST_RELEASE, (void**)&fp, REPORT_ERRORS) == FAILURE) {
366: php_stream_close(stream);
367: if (opened_path && *opened_path) {
368: efree(*opened_path);
369: }
370: return NULL;
371: }
372: return fp;
373: }
374: /* }}} */
375:
376: /* {{{ php_stream_make_seekable */
377: PHPAPI int _php_stream_make_seekable(php_stream *origstream, php_stream **newstream, int flags STREAMS_DC TSRMLS_DC)
378: {
379: if (newstream == NULL) {
380: return PHP_STREAM_FAILED;
381: }
382: *newstream = NULL;
383:
384: if (((flags & PHP_STREAM_FORCE_CONVERSION) == 0) && origstream->ops->seek != NULL) {
385: *newstream = origstream;
386: return PHP_STREAM_UNCHANGED;
387: }
388:
389: /* Use a tmpfile and copy the old streams contents into it */
390:
391: if (flags & PHP_STREAM_PREFER_STDIO) {
392: *newstream = php_stream_fopen_tmpfile();
393: } else {
394: *newstream = php_stream_temp_new();
395: }
396:
397: if (*newstream == NULL) {
398: return PHP_STREAM_FAILED;
399: }
400:
401: #if ZEND_DEBUG
402: (*newstream)->open_filename = origstream->open_filename;
403: (*newstream)->open_lineno = origstream->open_lineno;
404: #endif
405:
406: if (php_stream_copy_to_stream_ex(origstream, *newstream, PHP_STREAM_COPY_ALL, NULL) != SUCCESS) {
407: php_stream_close(*newstream);
408: *newstream = NULL;
409: return PHP_STREAM_CRITICAL;
410: }
411:
412: php_stream_close(origstream);
413: php_stream_seek(*newstream, 0, SEEK_SET);
414:
415: return PHP_STREAM_RELEASED;
416: }
417: /* }}} */
418:
419: /*
420: * Local variables:
421: * tab-width: 4
422: * c-basic-offset: 4
423: * End:
424: * vim600: noet sw=4 ts=4 fdm=marker
425: * vim<600: noet sw=4 ts=4
426: */
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