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) 2004-2014, 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(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 char *php_http_buffer_data(const php_http_buffer_t *buf, char **into, size_t *len)
 135 {
 136         char *copy = ecalloc(1, buf->used + 1);
 137         memcpy(copy, buf->data, buf->used);
 138         if (into) {
 139                 *into = copy;
 140         }
 141         if (len) {
 142                 *len = buf->used;
 143         }
 144         return copy;
 145 }
 146
 147 PHP_HTTP_BUFFER_API size_t php_http_buffer_cut(php_http_buffer_t *buf, size_t offset, size_t length)
 148 {
 149         if (offset > buf->used) {
 150                 return 0;
 151         }
 152         if (offset + length > buf->used) {
 153                 length = buf->used - offset;
 154         }
 155         memmove(buf->data + offset, buf->data + offset + length, buf->used - length - offset);
 156         buf->used -= length;
 157         buf->free += length;
 158         return length;
 159 }
 160
 161 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_fix(php_http_buffer_t *buf)
 162 {
 163         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_resize_ex(buf, 1, 1, 0)) {
 164                 return NULL;
 165         }
 166         buf->data[buf->used] = '\0';
 167         return buf;
 168 }
 169
 170 PHP_HTTP_BUFFER_API void php_http_buffer_reset(php_http_buffer_t *buf)
 171 {
 172         buf->free += buf->used;
 173         buf->used = 0;
 174 }
 175
 176 PHP_HTTP_BUFFER_API void php_http_buffer_dtor(php_http_buffer_t *buf)
 177 {
 178         if (buf->data) {
 179                 pefree(buf->data, buf->pmem);
 180                 buf->data = NULL;
 181         }
 182         buf->used = 0;
 183         buf->free = 0;
 184 }
 185
 186 PHP_HTTP_BUFFER_API void php_http_buffer_free(php_http_buffer_t **buf)
 187 {
 188         if (*buf) {
 189                 php_http_buffer_dtor(*buf);
 190                 pefree(*buf, (*buf)->pmem);
 191                 *buf = NULL;
 192         }
 193 }
 194
 195 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)
 196 {
 197         php_http_buffer_t *storage;
 198
 199         *chunk = NULL;
 200
 201         if (!*s) {
 202                 *s = php_http_buffer_init_ex(NULL, chunk_size << 1, chunk_size ? PHP_HTTP_BUFFER_INIT_PREALLOC : 0);
 203         }
 204         storage = *s;
 205
 206         if (data_len) {
 207                 php_http_buffer_append(storage, data, data_len);
 208         }
 209
 210         if (!chunk_size) {
 211                 php_http_buffer_data(storage, chunk, &chunk_size);
 212                 php_http_buffer_free(s);
 213                 return chunk_size;
 214         }
 215
 216         if (storage->used >= chunk_size) {
 217                 *chunk = estrndup(storage->data, chunk_size);
 218                 php_http_buffer_cut(storage, 0, chunk_size);
 219                 return chunk_size;
 220         }
 221
 222         return 0;
 223 }
 224
 225 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)
 226 {
 227         char *chunk = NULL;
 228         size_t got = 0;
 229
 230         while ((got = php_http_buffer_chunk_buffer(s, data, data_len, &chunk, chunk_len))) {
 231                 passout(opaque, chunk, got TSRMLS_CC);
 232                 if (!chunk_len) {
 233                         /*      we already got the last chunk,
 234                                 and freed all resources */
 235                         break;
 236                 }
 237                 data = NULL;
 238                 data_len = 0;
 239                 STR_SET(chunk, NULL);
 240         }
 241         STR_FREE(chunk);
 242 }
 243
 244 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)
 245 {
 246         size_t passed_on = 0, passed_in = php_http_buffer_chunked_input(s, chunk_size, passin, passin_arg TSRMLS_CC);
 247
 248         if (passed_in == PHP_HTTP_BUFFER_PASS0) {
 249                 return passed_in;
 250         }
 251         if (passed_in || (*s)->used) {
 252                 passed_on = passon(passon_arg, (*s)->data, (*s)->used TSRMLS_CC);
 253
 254                 if (passed_on == PHP_HTTP_BUFFER_PASS0) {
 255                         return passed_on;
 256                 }
 257
 258                 if (passed_on) {
 259                         php_http_buffer_cut(*s, 0, passed_on);
 260                 }
 261         }
 262
 263         return passed_on - passed_in;
 264 }
 265
 266 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)
 267 {
 268         php_http_buffer_t *str;
 269         size_t passed;
 270
 271         if (!*s) {
 272                 *s = php_http_buffer_init_ex(NULL, chunk_size, chunk_size ? PHP_HTTP_BUFFER_INIT_PREALLOC : 0);
 273         }
 274         str = *s;
 275
 276         php_http_buffer_resize(str, chunk_size);
 277         passed = passin(opaque, str->data + str->used, chunk_size TSRMLS_CC);
 278
 279         if (passed != PHP_HTTP_BUFFER_PASS0) {
 280                 str->used += passed;
 281                 str->free -= passed;
 282         }
 283
 284         php_http_buffer_fix(str);
 285
 286         return passed;
 287 }
 288
 289 #ifdef PHP_HTTP_BUFFER_EXTENDED
 290
 291 PHP_HTTP_BUFFER_API int php_http_buffer_cmp(php_http_buffer_t *left, php_http_buffer_t *right)
 292 {
 293         if (left->used > right->used) {
 294                 return -1;
 295         } else if (right->used > left->used) {
 296                 return 1;
 297         } else {
 298                 return memcmp(left->data, right->data, left->used);
 299         }
 300 }
 301
 302 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_copy(const php_http_buffer_t *from, php_http_buffer_t *to)
 303 {
 304         int free_to = !to;
 305
 306         to = php_http_buffer_clone(from, to);
 307
 308         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_append(to, from->data, from->used)) {
 309                 if (free_to) {
 310                         php_http_buffer_free(&to);
 311                 } else {
 312                         php_http_buffer_dtor(to);
 313                 }
 314         }
 315         return to;
 316 }
 317
 318 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)
 319 {
 320         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_resize(buf, insert_len)) {
 321                 return PHP_HTTP_BUFFER_NOMEM;
 322         }
 323         memmove(buf->data + offset + insert_len, buf->data + offset, insert_len);
 324         memcpy(buf->data + offset, insert, insert_len);
 325         buf->used += insert_len;
 326         buf->free -= insert_len;
 327         return insert_len;
 328 }
 329
 330 PHP_HTTP_BUFFER_API size_t php_http_buffer_insertf(php_http_buffer_t *buf, size_t offset, const char *format, ...)
 331 {
 332         va_list argv;
 333         char *insert;
 334         size_t insert_len, alloc;
 335
 336         va_start(argv, format);
 337         insert_len = vspprintf(&insert, 0, format, argv);
 338         va_end(argv);
 339
 340         alloc = php_http_buffer_insert(buf, insert, insert_len, offset);
 341         efree(insert);
 342
 343         if (PHP_HTTP_BUFFER_NOMEM == alloc) {
 344                 return PHP_HTTP_BUFFER_NOMEM;
 345         }
 346         return insert_len;
 347 }
 348
 349 PHP_HTTP_BUFFER_API size_t php_http_buffer_prepend(php_http_buffer_t *buf, const char *prepend, size_t prepend_len)
 350 {
 351         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_resize(buf, prepend_len)) {
 352                 return PHP_HTTP_BUFFER_NOMEM;
 353         }
 354         memmove(buf->data + prepend_len, buf->data, buf->used);
 355         memcpy(buf->data, prepend, prepend_len);
 356         buf->used += prepend_len;
 357         buf->free -= prepend_len;
 358         return prepend_len;
 359 }
 360
 361 PHP_HTTP_BUFFER_API size_t php_http_buffer_prependf(php_http_buffer_t *buf, const char *format, ...)
 362 {
 363         va_list argv;
 364         char *prepend;
 365         size_t prepend_len, alloc;
 366
 367         va_start(argv, format);
 368         prepend_len = vspprintf(&prepend, 0, format, argv);
 369         va_end(argv);
 370
 371         alloc = php_http_buffer_prepend(buf, prepend, prepend_len);
 372         efree(prepend);
 373
 374         if (PHP_HTTP_BUFFER_NOMEM == alloc) {
 375                 return PHP_HTTP_BUFFER_NOMEM;
 376         }
 377         return prepend_len;
 378 }
 379
 380 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_sub(const php_http_buffer_t *buf, size_t offset, size_t length)
 381 {
 382         if (offset >= buf->used) {
 383                 return NULL;
 384         } else {
 385                 size_t need = 1 + ((length + offset) > buf->used ? (buf->used - offset) : (length - offset));
 386                 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));
 387                 if (sub) {
 388                         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_append(sub, buf->data + offset, need)) {
 389                                 php_http_buffer_free(&sub);
 390                         } else {
 391                                 sub->size = buf->size;
 392                         }
 393                 }
 394                 return sub;
 395         }
 396 }
 397
 398 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_right(const php_http_buffer_t *buf, size_t length)
 399 {
 400         if (length < buf->used) {
 401                 return php_http_buffer_sub(buf, buf->used - length, length);
 402         } else {
 403                 return php_http_buffer_sub(buf, 0, buf->used);
 404         }
 405 }
 406
 407
 408 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_merge_va(php_http_buffer_t *buf, unsigned argc, va_list argv)
 409 {
 410         unsigned i = 0;
 411         buf = php_http_buffer_init(buf);
 412
 413         if (buf) {
 414                 while (argc > i++) {
 415                         php_http_buffer_free_t f = va_arg(argv, php_http_buffer_free_t);
 416                         php_http_buffer_t *current = va_arg(argv, php_http_buffer_t *);
 417                         php_http_buffer_append(buf, current->data, current->used);
 418                         FREE_PHP_HTTP_BUFFER(f, current);
 419                 }
 420         }
 421
 422         return buf;
 423 }
 424
 425 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_merge_ex(php_http_buffer_t *buf, unsigned argc, ...)
 426 {
 427         va_list argv;
 428         php_http_buffer_t *ret;
 429
 430         va_start(argv, argc);
 431         ret = php_http_buffer_merge_va(buf, argc, argv);
 432         va_end(argv);
 433         return ret;
 434 }
 435
 436 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_merge(unsigned argc, ...)
 437 {
 438         va_list argv;
 439         php_http_buffer_t *ret;
 440
 441         va_start(argv, argc);
 442         ret = php_http_buffer_merge_va(NULL, argc, argv);
 443         va_end(argv);
 444         return ret;
 445 }
 446
 447 #endif
 448
 449 /*
 450  * Local variables:
 451  * tab-width: 4
 452  * c-basic-offset: 4
 453  * End:
 454  * vim600: sw=4 ts=4 fdm=marker
 455  * vim<600: sw=4 ts=4
 456  */
 457