git.m6w6.name Git - m6w6/ext-http/blob - 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) 2004-2011, 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(php_http_buffer_t *buf, size_t chunk_size, int flags)
  17 {
  18         if (!buf) {
  19                 buf = pemalloc(sizeof(*buf), flags & PHP_HTTP_BUFFER_INIT_PERSISTENT);
  20         }
  21
  22         if (buf) {
  23                 buf->size = (chunk_size) ? chunk_size : PHP_HTTP_BUFFER_DEFAULT_SIZE;
  24                 buf->pmem = (flags & PHP_HTTP_BUFFER_INIT_PERSISTENT) ? 1 : 0;
  25                 buf->data = (flags & PHP_HTTP_BUFFER_INIT_PREALLOC) ? pemalloc(buf->size, buf->pmem) : NULL;
  26                 buf->free = (flags & PHP_HTTP_BUFFER_INIT_PREALLOC) ? buf->size : 0;
  27                 buf->used = 0;
  28         }
  29
  30         return buf;
  31 }
  32
  33 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_from_string_ex(php_http_buffer_t *buf, const char *string, size_t length)
  34 {
  35         if ((buf = php_http_buffer_init(buf))) {
  36                 if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_append(buf, string, length)) {
  37                         pefree(buf, buf->pmem);
  38                         buf = NULL;
  39                 }
  40         }
  41         return buf;
  42 }
  43
  44 PHP_HTTP_BUFFER_API size_t php_http_buffer_resize_ex(php_http_buffer_t *buf, size_t len, size_t override_size, int allow_error)
  45 {
  46         char *ptr = NULL;
  47 #if 0
  48         fprintf(stderr, "RESIZE: len=%lu, size=%lu, used=%lu, free=%lu\n", len, buf->size, buf->used, buf->free);
  49 #endif
  50         if (buf->free < len) {
  51                 size_t size = override_size ? override_size : buf->size;
  52
  53                 while ((size + buf->free) < len) {
  54                         size <<= 1;
  55                 }
  56
  57                 if (allow_error) {
  58                         ptr = perealloc_recoverable(buf->data, buf->used + buf->free + size, buf->pmem);
  59                 } else {
  60                         ptr = perealloc(buf->data, buf->used + buf->free + size, buf->pmem);
  61                 }
  62
  63                 if (ptr) {
  64                         buf->data = ptr;
  65                 } else {
  66                         return PHP_HTTP_BUFFER_NOMEM;
  67                 }
  68
  69                 buf->free += size;
  70                 return size;
  71         }
  72         return 0;
  73 }
  74
  75 PHP_HTTP_BUFFER_API char *php_http_buffer_account(php_http_buffer_t *buf, size_t to_account)
  76 {
  77         /* it's probably already too late but check anyway */
  78         if (to_account > buf->free) {
  79                 return NULL;
  80         }
  81
  82         buf->free -= to_account;
  83         buf->used += to_account;
  84
  85         return buf->data + buf->used;
  86 }
  87
  88 PHP_HTTP_BUFFER_API size_t php_http_buffer_shrink(php_http_buffer_t *buf)
  89 {
  90         /* avoid another realloc on fixation */
  91         if (buf->free > 1) {
  92                 char *ptr = perealloc(buf->data, buf->used + 1, buf->pmem);
  93
  94                 if (ptr) {
  95                         buf->data = ptr;
  96                 } else {
  97                         return PHP_HTTP_BUFFER_NOMEM;
  98                 }
  99                 buf->free = 1;
 100         }
 101         return buf->used;
 102 }
 103
 104 PHP_HTTP_BUFFER_API size_t php_http_buffer_append(php_http_buffer_t *buf, const char *append, size_t append_len)
 105 {
 106         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_resize(buf, append_len)) {
 107                 return PHP_HTTP_BUFFER_NOMEM;
 108         }
 109         memcpy(buf->data + buf->used, append, append_len);
 110         buf->used += append_len;
 111         buf->free -= append_len;
 112         return append_len;
 113 }
 114
 115 PHP_HTTP_BUFFER_API size_t php_http_buffer_appendf(php_http_buffer_t *buf, const char *format, ...)
 116 {
 117         va_list argv;
 118         char *append;
 119         size_t append_len, alloc;
 120
 121         va_start(argv, format);
 122         append_len = vspprintf(&append, 0, format, argv);
 123         va_end(argv);
 124
 125         alloc = php_http_buffer_append(buf, append, append_len);
 126         efree(append);
 127
 128         if (PHP_HTTP_BUFFER_NOMEM == alloc) {
 129                 return PHP_HTTP_BUFFER_NOMEM;
 130         }
 131         return append_len;
 132 }
 133
 134 PHP_HTTP_BUFFER_API size_t php_http_buffer_insert(php_http_buffer_t *buf, const char *insert, size_t insert_len, size_t offset)
 135 {
 136         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_resize(buf, insert_len)) {
 137                 return PHP_HTTP_BUFFER_NOMEM;
 138         }
 139         memmove(buf->data + offset + insert_len, buf->data + offset, insert_len);
 140         memcpy(buf->data + offset, insert, insert_len);
 141         buf->used += insert_len;
 142         buf->free -= insert_len;
 143         return insert_len;
 144 }
 145
 146 PHP_HTTP_BUFFER_API size_t php_http_buffer_insertf(php_http_buffer_t *buf, size_t offset, const char *format, ...)
 147 {
 148         va_list argv;
 149         char *insert;
 150         size_t insert_len, alloc;
 151
 152         va_start(argv, format);
 153         insert_len = vspprintf(&insert, 0, format, argv);
 154         va_end(argv);
 155
 156         alloc = php_http_buffer_insert(buf, insert, insert_len, offset);
 157         efree(insert);
 158
 159         if (PHP_HTTP_BUFFER_NOMEM == alloc) {
 160                 return PHP_HTTP_BUFFER_NOMEM;
 161         }
 162         return insert_len;
 163 }
 164
 165 PHP_HTTP_BUFFER_API size_t php_http_buffer_prepend(php_http_buffer_t *buf, const char *prepend, size_t prepend_len)
 166 {
 167         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_resize(buf, prepend_len)) {
 168                 return PHP_HTTP_BUFFER_NOMEM;
 169         }
 170         memmove(buf->data + prepend_len, buf->data, buf->used);
 171         memcpy(buf->data, prepend, prepend_len);
 172         buf->used += prepend_len;
 173         buf->free -= prepend_len;
 174         return prepend_len;
 175 }
 176
 177 PHP_HTTP_BUFFER_API size_t php_http_buffer_prependf(php_http_buffer_t *buf, const char *format, ...)
 178 {
 179         va_list argv;
 180         char *prepend;
 181         size_t prepend_len, alloc;
 182
 183         va_start(argv, format);
 184         prepend_len = vspprintf(&prepend, 0, format, argv);
 185         va_end(argv);
 186
 187         alloc = php_http_buffer_prepend(buf, prepend, prepend_len);
 188         efree(prepend);
 189
 190         if (PHP_HTTP_BUFFER_NOMEM == alloc) {
 191                 return PHP_HTTP_BUFFER_NOMEM;
 192         }
 193         return prepend_len;
 194 }
 195
 196 PHP_HTTP_BUFFER_API char *php_http_buffer_data(const php_http_buffer_t *buf, char **into, size_t *len)
 197 {
 198         char *copy = ecalloc(1, buf->used + 1);
 199         memcpy(copy, buf->data, buf->used);
 200         if (into) {
 201                 *into = copy;
 202         }
 203         if (len) {
 204                 *len = buf->used;
 205         }
 206         return copy;
 207 }
 208
 209 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_copy(const php_http_buffer_t *from, php_http_buffer_t *to)
 210 {
 211         int free_to = !to;
 212
 213         to = php_http_buffer_clone(from, to);
 214
 215         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_append(to, from->data, from->used)) {
 216                 if (free_to) {
 217                         php_http_buffer_free(&to);
 218                 } else {
 219                         php_http_buffer_dtor(to);
 220                 }
 221         }
 222         return to;
 223 }
 224
 225 PHP_HTTP_BUFFER_API size_t php_http_buffer_cut(php_http_buffer_t *buf, size_t offset, size_t length)
 226 {
 227         if (offset > buf->used) {
 228                 return 0;
 229         }
 230         if (offset + length > buf->used) {
 231                 length = buf->used - offset;
 232         }
 233         memmove(buf->data + offset, buf->data + offset + length, buf->used - length - offset);
 234         buf->used -= length;
 235         buf->free += length;
 236         return length;
 237 }
 238
 239 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_sub(const php_http_buffer_t *buf, size_t offset, size_t length)
 240 {
 241         if (offset >= buf->used) {
 242                 return NULL;
 243         } else {
 244                 size_t need = 1 + ((length + offset) > buf->used ? (buf->used - offset) : (length - offset));
 245                 php_http_buffer_t *sub = php_http_buffer_init_ex(NULL, need, PHP_HTTP_BUFFER_INIT_PREALLOC | (buf->pmem ? PHP_HTTP_BUFFER_INIT_PERSISTENT:0));
 246                 if (sub) {
 247                         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_append(sub, buf->data + offset, need)) {
 248                                 php_http_buffer_free(&sub);
 249                         } else {
 250                                 sub->size = buf->size;
 251                         }
 252                 }
 253                 return sub;
 254         }
 255 }
 256
 257 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_right(const php_http_buffer_t *buf, size_t length)
 258 {
 259         if (length < buf->used) {
 260                 return php_http_buffer_sub(buf, buf->used - length, length);
 261         } else {
 262                 return php_http_buffer_sub(buf, 0, buf->used);
 263         }
 264 }
 265
 266
 267 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_merge_va(php_http_buffer_t *buf, unsigned argc, va_list argv)
 268 {
 269         unsigned i = 0;
 270         buf = php_http_buffer_init(buf);
 271
 272         if (buf) {
 273                 while (argc > i++) {
 274                         php_http_buffer_free_t f = va_arg(argv, php_http_buffer_free_t);
 275                         php_http_buffer_t *current = va_arg(argv, php_http_buffer_t *);
 276                         php_http_buffer_append(buf, current->data, current->used);
 277                         FREE_PHP_HTTP_BUFFER(f, current);
 278                 }
 279         }
 280
 281         return buf;
 282 }
 283
 284 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_merge_ex(php_http_buffer_t *buf, unsigned argc, ...)
 285 {
 286         va_list argv;
 287         php_http_buffer_t *ret;
 288
 289         va_start(argv, argc);
 290         ret = php_http_buffer_merge_va(buf, argc, argv);
 291         va_end(argv);
 292         return ret;
 293 }
 294
 295 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_merge(unsigned argc, ...)
 296 {
 297         va_list argv;
 298         php_http_buffer_t *ret;
 299
 300         va_start(argv, argc);
 301         ret = php_http_buffer_merge_va(NULL, argc, argv);
 302         va_end(argv);
 303         return ret;
 304 }
 305
 306 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_fix(php_http_buffer_t *buf)
 307 {
 308         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_resize_ex(buf, 1, 1, 0)) {
 309                 return NULL;
 310         }
 311         buf->data[buf->used] = '\0';
 312         return buf;
 313 }
 314
 315 PHP_HTTP_BUFFER_API int php_http_buffer_cmp(php_http_buffer_t *left, php_http_buffer_t *right)
 316 {
 317         if (left->used > right->used) {
 318                 return -1;
 319         } else if (right->used > left->used) {
 320                 return 1;
 321         } else {
 322                 return memcmp(left->data, right->data, left->used);
 323         }
 324 }
 325
 326 PHP_HTTP_BUFFER_API void php_http_buffer_reset(php_http_buffer_t *buf)
 327 {
 328         buf->free += buf->used;
 329         buf->used = 0;
 330 }
 331
 332 PHP_HTTP_BUFFER_API void php_http_buffer_dtor(php_http_buffer_t *buf)
 333 {
 334         if (buf->data) {
 335                 pefree(buf->data, buf->pmem);
 336                 buf->data = NULL;
 337         }
 338         buf->used = 0;
 339         buf->free = 0;
 340 }
 341
 342 PHP_HTTP_BUFFER_API void php_http_buffer_free(php_http_buffer_t **buf)
 343 {
 344         if (*buf) {
 345                 php_http_buffer_dtor(*buf);
 346                 pefree(*buf, (*buf)->pmem);
 347                 *buf = NULL;
 348         }
 349 }
 350
 351 PHP_HTTP_BUFFER_API size_t php_http_buffer_chunk_buffer(php_http_buffer_t **s, const char *data, size_t data_len, char **chunk, size_t chunk_size)
 352 {
 353         php_http_buffer_t *storage;
 354
 355         *chunk = NULL;
 356
 357         if (!*s) {
 358                 *s = php_http_buffer_init_ex(NULL, chunk_size << 1, chunk_size ? PHP_HTTP_BUFFER_INIT_PREALLOC : 0);
 359         }
 360         storage = *s;
 361
 362         if (data_len) {
 363                 php_http_buffer_append(storage, data, data_len);
 364         }
 365
 366         if (!chunk_size) {
 367                 php_http_buffer_data(storage, chunk, &chunk_size);
 368                 php_http_buffer_free(s);
 369                 return chunk_size;
 370         }
 371
 372         if (storage->used >= chunk_size) {
 373                 *chunk = estrndup(storage->data, chunk_size);
 374                 php_http_buffer_cut(storage, 0, chunk_size);
 375                 return chunk_size;
 376         }
 377
 378         return 0;
 379 }
 380
 381 PHP_HTTP_BUFFER_API void php_http_buffer_chunked_output(php_http_buffer_t **s, const char *data, size_t data_len, size_t chunk_len, php_http_buffer_pass_func_t passout, void *opaque TSRMLS_DC)
 382 {
 383         char *chunk = NULL;
 384         size_t got = 0;
 385
 386         while ((got = php_http_buffer_chunk_buffer(s, data, data_len, &chunk, chunk_len))) {
 387                 passout(opaque, chunk, got TSRMLS_CC);
 388                 if (!chunk_len) {
 389                         /*      we already got the last chunk,
 390                                 and freed all resources */
 391                         break;
 392                 }
 393                 data = NULL;
 394                 data_len = 0;
 395                 STR_SET(chunk, NULL);
 396         }
 397         STR_FREE(chunk);
 398 }
 399
 400 PHP_HTTP_BUFFER_API ssize_t php_http_buffer_passthru(php_http_buffer_t **s, size_t chunk_size, php_http_buffer_pass_func_t passin, void *passin_arg, php_http_buffer_pass_func_t passon, void *passon_arg TSRMLS_DC)
 401 {
 402         size_t passed_on = 0, passed_in = php_http_buffer_chunked_input(s, chunk_size, passin, passin_arg TSRMLS_CC);
 403
 404         if (passed_in == PHP_HTTP_BUFFER_PASS0) {
 405                 return passed_in;
 406         }
 407         if (passed_in || (*s)->used) {
 408                 passed_on = passon(passon_arg, (*s)->data, (*s)->used TSRMLS_CC);
 409
 410                 if (passed_on == PHP_HTTP_BUFFER_PASS0) {
 411                         return passed_on;
 412                 }
 413
 414                 if (passed_on) {
 415                         php_http_buffer_cut(*s, 0, passed_on);
 416                 }
 417         }
 418
 419         return passed_on - passed_in;
 420 }
 421
 422 PHP_HTTP_BUFFER_API size_t php_http_buffer_chunked_input(php_http_buffer_t **s, size_t chunk_size, php_http_buffer_pass_func_t passin, void *opaque TSRMLS_DC)
 423 {
 424         php_http_buffer_t *str;
 425         size_t passed;
 426
 427         if (!*s) {
 428                 *s = php_http_buffer_init_ex(NULL, chunk_size, chunk_size ? PHP_HTTP_BUFFER_INIT_PREALLOC : 0);
 429         }
 430         str = *s;
 431
 432         php_http_buffer_resize(str, chunk_size);
 433         passed = passin(opaque, str->data + str->used, chunk_size TSRMLS_CC);
 434
 435         if (passed != PHP_HTTP_BUFFER_PASS0) {
 436                 str->used += passed;
 437                 str->free -= passed;
 438         }
 439
 440         php_http_buffer_fix(str);
 441
 442         return passed;
 443 }
 444
 445 /*
 446  * Local variables:
 447  * tab-width: 4
 448  * c-basic-offset: 4
 449  * End:
 450  * vim600: sw=4 ts=4 fdm=marker
 451  * vim<600: sw=4 ts=4
 452  */
 453