git.m6w6.name Git - m6w6/ext-http/blob - src/php_http_buffer.c

   1 /*
   2     +--------------------------------------------------------------------+
   3     | PECL :: http                                                       |
   4     +--------------------------------------------------------------------+
   5     | Redistribution and use in source and binary forms, with or without |
   6     | modification, are permitted provided that the conditions mentioned |
   7     | in the accompanying LICENSE file are met.                          |
   8     +--------------------------------------------------------------------+
   9     | Copyright (c) 2004-2014, Michael Wallner <mike@php.net>            |
  10     +--------------------------------------------------------------------+
  11 */
  12
  13 #include "php.h"
  14 #include "php_http_buffer.h"
  15
  16 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_init_ex(
  17                 php_http_buffer_t *buf, size_t chunk_size, unsigned flags)
  18 {
  19         if (!buf) {
  20                 buf = pemalloc(sizeof(*buf), flags & PHP_HTTP_BUFFER_INIT_PERSISTENT);
  21         }
  22
  23         if (buf) {
  24                 buf->size = (chunk_size) ? chunk_size : PHP_HTTP_BUFFER_DEFAULT_SIZE;
  25                 buf->pmem = (flags & PHP_HTTP_BUFFER_INIT_PERSISTENT) ? 1 : 0;
  26                 buf->data = (flags & PHP_HTTP_BUFFER_INIT_PREALLOC) ?
  27                                 pemalloc(buf->size, buf->pmem) : NULL;
  28                 buf->free = (flags & PHP_HTTP_BUFFER_INIT_PREALLOC) ? buf->size : 0;
  29                 buf->used = 0;
  30         }
  31
  32         return buf;
  33 }
  34
  35 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_from_string_ex(
  36                 php_http_buffer_t *buf, const char *str, size_t len)
  37 {
  38         int free_buf = !!buf;
  39
  40         if ((buf = php_http_buffer_init(buf))) {
  41                 if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_append(buf, str, len)) {
  42                         if (free_buf) {
  43                                 pefree(buf, buf->pmem);
  44                         }
  45                         buf = NULL;
  46                 }
  47         }
  48         return buf;
  49 }
  50
  51 PHP_HTTP_BUFFER_API size_t php_http_buffer_resize_ex(
  52                 php_http_buffer_t *buf, size_t len, size_t override_size,
  53                 zend_bool allow_error)
  54 {
  55         char *ptr = NULL;
  56 #if 0
  57         fprintf(stderr, "RESIZE: len=%lu, size=%lu, used=%lu, free=%lu, total=%lu\n", len, buf->size, buf->used, buf->free, buf->free+buf->used);
  58 #endif
  59         if (buf->free < len) {
  60                 size_t size = override_size ? override_size : buf->size;
  61
  62                 while ((size + buf->free) < len) {
  63                         size <<= 1;
  64                 }
  65
  66                 if (allow_error) {
  67                         ptr = perealloc_recoverable(buf->data,
  68                                         buf->used + buf->free + size, buf->pmem);
  69                 } else {
  70                         ptr = perealloc(buf->data, buf->used + buf->free + size, buf->pmem);
  71                 }
  72
  73                 if (ptr) {
  74                         buf->data = ptr;
  75                 } else {
  76                         return PHP_HTTP_BUFFER_NOMEM;
  77                 }
  78
  79                 buf->free += size;
  80                 return size;
  81         }
  82         return 0;
  83 }
  84
  85 PHP_HTTP_BUFFER_API char *php_http_buffer_account(
  86                 php_http_buffer_t *buf, size_t to_account)
  87 {
  88         assert(to_account <= buf->free);
  89
  90         buf->free -= to_account;
  91         buf->used += to_account;
  92
  93         return buf->data + buf->used;
  94 }
  95
  96 PHP_HTTP_BUFFER_API size_t php_http_buffer_shrink(php_http_buffer_t *buf)
  97 {
  98         /* avoid another realloc on fixation */
  99         if (buf->free > 1) {
 100                 char *ptr = perealloc(buf->data, buf->used + 1, buf->pmem);
 101
 102                 if (ptr) {
 103                         buf->data = ptr;
 104                 } else {
 105                         return PHP_HTTP_BUFFER_NOMEM;
 106                 }
 107                 buf->free = 1;
 108         }
 109         return buf->used;
 110 }
 111
 112 PHP_HTTP_BUFFER_API size_t php_http_buffer_append(php_http_buffer_t *buf,
 113                 const char *append, size_t append_len)
 114 {
 115         if (    buf->free < append_len &&
 116                         PHP_HTTP_BUFFER_NOMEM == php_http_buffer_resize(buf, append_len)
 117         ) {
 118                 return PHP_HTTP_BUFFER_NOMEM;
 119         }
 120         memcpy(buf->data + buf->used, append, append_len);
 121         buf->used += append_len;
 122         buf->free -= append_len;
 123         return append_len;
 124 }
 125
 126 PHP_HTTP_BUFFER_API size_t php_http_buffer_appendf(php_http_buffer_t *buf,
 127                 const char *format, ...)
 128 {
 129         va_list argv;
 130         char *append;
 131         size_t append_len, alloc;
 132
 133         va_start(argv, format);
 134         append_len = vspprintf(&append, 0, format, argv);
 135         va_end(argv);
 136
 137         alloc = php_http_buffer_append(buf, append, append_len);
 138         efree(append);
 139
 140         if (PHP_HTTP_BUFFER_NOMEM == alloc) {
 141                 return PHP_HTTP_BUFFER_NOMEM;
 142         }
 143         return append_len;
 144 }
 145
 146 PHP_HTTP_BUFFER_API char *php_http_buffer_data(const php_http_buffer_t *buf,
 147                 char **into, size_t *len)
 148 {
 149         char *copy = ecalloc(1, buf->used + 1);
 150         memcpy(copy, buf->data, buf->used);
 151         if (into) {
 152                 *into = copy;
 153         }
 154         if (len) {
 155                 *len = buf->used;
 156         }
 157         return copy;
 158 }
 159
 160 PHP_HTTP_BUFFER_API size_t php_http_buffer_cut(php_http_buffer_t *buf,
 161                 size_t offset, size_t length)
 162 {
 163         if (offset > buf->used) {
 164                 return 0;
 165         }
 166         if (offset + length > buf->used) {
 167                 length = buf->used - offset;
 168         }
 169         memmove(buf->data + offset, buf->data + offset + length,
 170                         buf->used - length - offset);
 171         buf->used -= length;
 172         buf->free += length;
 173         return length;
 174 }
 175
 176 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_fix(
 177                 php_http_buffer_t *buf)
 178 {
 179         if (    buf->free < 1 &&
 180                         PHP_HTTP_BUFFER_NOMEM == php_http_buffer_resize_ex(buf, 1, 1, 0)
 181         ) {
 182                 return NULL;
 183         }
 184         buf->data[buf->used] = '\0';
 185         return buf;
 186 }
 187
 188 PHP_HTTP_BUFFER_API void php_http_buffer_reset(php_http_buffer_t *buf)
 189 {
 190         buf->free += buf->used;
 191         buf->used = 0;
 192 }
 193
 194 PHP_HTTP_BUFFER_API void php_http_buffer_dtor(php_http_buffer_t *buf)
 195 {
 196         if (buf->data) {
 197                 pefree(buf->data, buf->pmem);
 198                 buf->data = NULL;
 199         }
 200         buf->used = 0;
 201         buf->free = 0;
 202 }
 203
 204 PHP_HTTP_BUFFER_API void php_http_buffer_free(php_http_buffer_t **buf)
 205 {
 206         if (*buf) {
 207                 php_http_buffer_dtor(*buf);
 208                 pefree(*buf, (*buf)->pmem);
 209                 *buf = NULL;
 210         }
 211 }
 212
 213 PHP_HTTP_BUFFER_API size_t php_http_buffer_chunk_buffer(php_http_buffer_t **s,
 214                 const char *data, size_t data_len, char **chunk, size_t chunk_size)
 215 {
 216         php_http_buffer_t *storage;
 217
 218         *chunk = NULL;
 219
 220         if (!*s) {
 221                 *s = php_http_buffer_init_ex(NULL, chunk_size << 1,
 222                                 chunk_size ? PHP_HTTP_BUFFER_INIT_PREALLOC : 0);
 223         }
 224         storage = *s;
 225
 226         if (data_len) {
 227                 php_http_buffer_append(storage, data, data_len);
 228         }
 229
 230         if (!chunk_size) {
 231                 php_http_buffer_data(storage, chunk, &chunk_size);
 232                 php_http_buffer_free(s);
 233                 return chunk_size;
 234         }
 235
 236         if (storage->used >= chunk_size) {
 237                 *chunk = estrndup(storage->data, chunk_size);
 238                 php_http_buffer_cut(storage, 0, chunk_size);
 239                 return chunk_size;
 240         }
 241
 242         return 0;
 243 }
 244
 245 PHP_HTTP_BUFFER_API size_t php_http_buffer_chunked_output(php_http_buffer_t **s,
 246                 const char *data, size_t data_len, size_t chunk_len,
 247                 php_http_buffer_pass_func_t passout, void *opaque)
 248 {
 249         char *chunk = NULL;
 250         size_t passed = 0, got = 0;
 251
 252         while ((got = php_http_buffer_chunk_buffer(s, data, data_len, &chunk, chunk_len))) {
 253                 if (PHP_HTTP_BUFFER_PASS0 == passout(opaque, chunk, got)) {
 254                         PTR_SET(chunk, NULL);
 255                         return PHP_HTTP_BUFFER_PASS0;
 256                 }
 257                 ++passed;
 258                 if (!chunk_len) {
 259                         /*      we already got the last chunk,
 260                                 and freed all resources */
 261                         break;
 262                 }
 263                 data = NULL;
 264                 data_len = 0;
 265                 PTR_SET(chunk, NULL);
 266         }
 267         PTR_FREE(chunk);
 268         return passed;
 269 }
 270
 271 PHP_HTTP_BUFFER_API ssize_t php_http_buffer_passthru(php_http_buffer_t **s, size_t chunk_size,
 272                 php_http_buffer_pass_func_t passin, void *passin_arg,
 273                 php_http_buffer_pass_func_t passon, void *passon_arg)
 274 {
 275         size_t passed_on = 0, passed_in;
 276
 277         passed_in = php_http_buffer_chunked_input(s, chunk_size, passin, passin_arg);
 278
 279         if (passed_in == PHP_HTTP_BUFFER_PASS0) {
 280                 return passed_in;
 281         }
 282         if (passed_in || (*s)->used) {
 283                 passed_on = passon(passon_arg, (*s)->data, (*s)->used);
 284
 285                 if (passed_on == PHP_HTTP_BUFFER_PASS0) {
 286                         return passed_on;
 287                 }
 288
 289                 if (passed_on) {
 290                         php_http_buffer_cut(*s, 0, passed_on);
 291                 }
 292         }
 293
 294         return passed_on - passed_in;
 295 }
 296
 297 PHP_HTTP_BUFFER_API size_t php_http_buffer_chunked_input(php_http_buffer_t **s,
 298                 size_t chunk_size, php_http_buffer_pass_func_t passin, void *opaque)
 299 {
 300         php_http_buffer_t *str;
 301         size_t passed;
 302
 303         if (!*s) {
 304                 *s = php_http_buffer_init_ex(NULL, chunk_size,
 305                                 chunk_size ? PHP_HTTP_BUFFER_INIT_PREALLOC : 0);
 306         }
 307         str = *s;
 308
 309         php_http_buffer_resize(str, chunk_size);
 310         passed = passin(opaque, str->data + str->used, chunk_size);
 311
 312         if (passed != PHP_HTTP_BUFFER_PASS0) {
 313                 str->used += passed;
 314                 str->free -= passed;
 315         }
 316
 317         php_http_buffer_fix(str);
 318
 319         return passed;
 320 }
 321
 322 #ifdef PHP_HTTP_BUFFER_EXTENDED
 323
 324 PHP_HTTP_BUFFER_API int php_http_buffer_cmp(php_http_buffer_t *left,
 325                 php_http_buffer_t *right)
 326 {
 327         if (left->used > right->used) {
 328                 return -1;
 329         } else if (right->used > left->used) {
 330                 return 1;
 331         } else {
 332                 return memcmp(left->data, right->data, left->used);
 333         }
 334 }
 335
 336 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_copy(
 337                 const php_http_buffer_t *from, php_http_buffer_t *to)
 338 {
 339         int free_to = !to;
 340
 341         to = php_http_buffer_clone(from, to);
 342
 343         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_append(to, from->data, from->used)) {
 344                 if (free_to) {
 345                         php_http_buffer_free(&to);
 346                 } else {
 347                         php_http_buffer_dtor(to);
 348                 }
 349         }
 350         return to;
 351 }
 352
 353 PHP_HTTP_BUFFER_API size_t php_http_buffer_insert(php_http_buffer_t *buf,
 354                 const char *insert, size_t insert_len, size_t offset)
 355 {
 356         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_resize(buf, insert_len)) {
 357                 return PHP_HTTP_BUFFER_NOMEM;
 358         }
 359         memmove(buf->data + offset + insert_len, buf->data + offset, insert_len);
 360         memcpy(buf->data + offset, insert, insert_len);
 361         buf->used += insert_len;
 362         buf->free -= insert_len;
 363         return insert_len;
 364 }
 365
 366 PHP_HTTP_BUFFER_API size_t php_http_buffer_insertf(php_http_buffer_t *buf,
 367                 size_t offset, const char *format, ...)
 368 {
 369         va_list argv;
 370         char *insert;
 371         size_t insert_len, alloc;
 372
 373         va_start(argv, format);
 374         insert_len = vspprintf(&insert, 0, format, argv);
 375         va_end(argv);
 376
 377         alloc = php_http_buffer_insert(buf, insert, insert_len, offset);
 378         efree(insert);
 379
 380         if (PHP_HTTP_BUFFER_NOMEM == alloc) {
 381                 return PHP_HTTP_BUFFER_NOMEM;
 382         }
 383         return insert_len;
 384 }
 385
 386 PHP_HTTP_BUFFER_API size_t php_http_buffer_prepend(php_http_buffer_t *buf,
 387                 const char *prepend, size_t prepend_len)
 388 {
 389         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_resize(buf, prepend_len)) {
 390                 return PHP_HTTP_BUFFER_NOMEM;
 391         }
 392         memmove(buf->data + prepend_len, buf->data, buf->used);
 393         memcpy(buf->data, prepend, prepend_len);
 394         buf->used += prepend_len;
 395         buf->free -= prepend_len;
 396         return prepend_len;
 397 }
 398
 399 PHP_HTTP_BUFFER_API size_t php_http_buffer_prependf(php_http_buffer_t *buf,
 400                 const char *format, ...)
 401 {
 402         va_list argv;
 403         char *prepend;
 404         size_t prepend_len, alloc;
 405
 406         va_start(argv, format);
 407         prepend_len = vspprintf(&prepend, 0, format, argv);
 408         va_end(argv);
 409
 410         alloc = php_http_buffer_prepend(buf, prepend, prepend_len);
 411         efree(prepend);
 412
 413         if (PHP_HTTP_BUFFER_NOMEM == alloc) {
 414                 return PHP_HTTP_BUFFER_NOMEM;
 415         }
 416         return prepend_len;
 417 }
 418
 419 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_sub(
 420                 const php_http_buffer_t *buf, size_t offset, size_t length)
 421 {
 422         if (offset >= buf->used) {
 423                 return NULL;
 424         } else {
 425                 php_http_buffer_t *sub;
 426                 size_t need = 1 + ((length + offset) > buf->used ?
 427                                 (buf->used - offset) : (length - offset));
 428                 unsigned flags = buf->pmem ? PHP_HTTP_BUFFER_INIT_PERSISTENT : 0;
 429
 430                 sub = php_http_buffer_init_ex(NULL, need,
 431                                 PHP_HTTP_BUFFER_INIT_PREALLOC | flags);
 432
 433                 if (sub) {
 434                         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_append(sub, buf->data + offset, need)) {
 435                                 php_http_buffer_free(&sub);
 436                         } else {
 437                                 sub->size = buf->size;
 438                         }
 439                 }
 440                 return sub;
 441         }
 442 }
 443
 444 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_right(
 445                 const php_http_buffer_t *buf, size_t length)
 446 {
 447         if (length < buf->used) {
 448                 return php_http_buffer_sub(buf, buf->used - length, length);
 449         } else {
 450                 return php_http_buffer_sub(buf, 0, buf->used);
 451         }
 452 }
 453
 454
 455 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_merge_va(
 456                 php_http_buffer_t *buf, unsigned argc, va_list argv)
 457 {
 458         unsigned i = 0;
 459         buf = php_http_buffer_init(buf);
 460
 461         if (buf) {
 462                 while (argc > i++) {
 463                         php_http_buffer_free_t f = va_arg(argv, php_http_buffer_free_t);
 464                         php_http_buffer_t *current = va_arg(argv, php_http_buffer_t *);
 465                         php_http_buffer_append(buf, current->data, current->used);
 466                         FREE_PHP_HTTP_BUFFER(f, current);
 467                 }
 468         }
 469
 470         return buf;
 471 }
 472
 473 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_merge_ex(
 474                 php_http_buffer_t *buf, unsigned argc, ...)
 475 {
 476         va_list argv;
 477         php_http_buffer_t *ret;
 478
 479         va_start(argv, argc);
 480         ret = php_http_buffer_merge_va(buf, argc, argv);
 481         va_end(argv);
 482         return ret;
 483 }
 484
 485 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_merge(unsigned argc, ...)
 486 {
 487         va_list argv;
 488         php_http_buffer_t *ret;
 489
 490         va_start(argv, argc);
 491         ret = php_http_buffer_merge_va(NULL, argc, argv);
 492         va_end(argv);
 493         return ret;
 494 }
 495
 496 #endif
 497
 498 /*
 499  * Local variables:
 500  * tab-width: 4
 501  * c-basic-offset: 4
 502  * End:
 503  * vim600: sw=4 ts=4 fdm=marker
 504  * vim<600: sw=4 ts=4
 505  */
 506