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, total=%lu\n", len, buf->size, buf->used, buf->free, buf->free+buf->used);
  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         assert(to_account <= buf->free);
  78
  79         buf->free -= to_account;
  80         buf->used += to_account;
  81
  82         return buf->data + buf->used;
  83 }
  84
  85 PHP_HTTP_BUFFER_API size_t php_http_buffer_shrink(php_http_buffer_t *buf)
  86 {
  87         /* avoid another realloc on fixation */
  88         if (buf->free > 1) {
  89                 char *ptr = perealloc(buf->data, buf->used + 1, buf->pmem);
  90
  91                 if (ptr) {
  92                         buf->data = ptr;
  93                 } else {
  94                         return PHP_HTTP_BUFFER_NOMEM;
  95                 }
  96                 buf->free = 1;
  97         }
  98         return buf->used;
  99 }
 100
 101 PHP_HTTP_BUFFER_API size_t php_http_buffer_append(php_http_buffer_t *buf, const char *append, size_t append_len)
 102 {
 103         if (buf->free < append_len && PHP_HTTP_BUFFER_NOMEM == php_http_buffer_resize(buf, append_len)) {
 104                 return PHP_HTTP_BUFFER_NOMEM;
 105         }
 106         memcpy(buf->data + buf->used, append, append_len);
 107         buf->used += append_len;
 108         buf->free -= append_len;
 109         return append_len;
 110 }
 111
 112 PHP_HTTP_BUFFER_API size_t php_http_buffer_appendf(php_http_buffer_t *buf, const char *format, ...)
 113 {
 114         va_list argv;
 115         char *append;
 116         size_t append_len, alloc;
 117
 118         va_start(argv, format);
 119         append_len = vspprintf(&append, 0, format, argv);
 120         va_end(argv);
 121
 122         alloc = php_http_buffer_append(buf, append, append_len);
 123         efree(append);
 124
 125         if (PHP_HTTP_BUFFER_NOMEM == alloc) {
 126                 return PHP_HTTP_BUFFER_NOMEM;
 127         }
 128         return append_len;
 129 }
 130
 131 PHP_HTTP_BUFFER_API char *php_http_buffer_data(const php_http_buffer_t *buf, char **into, size_t *len)
 132 {
 133         char *copy = ecalloc(1, buf->used + 1);
 134         memcpy(copy, buf->data, buf->used);
 135         if (into) {
 136                 *into = copy;
 137         }
 138         if (len) {
 139                 *len = buf->used;
 140         }
 141         return copy;
 142 }
 143
 144 PHP_HTTP_BUFFER_API size_t php_http_buffer_cut(php_http_buffer_t *buf, size_t offset, size_t length)
 145 {
 146         if (offset > buf->used) {
 147                 return 0;
 148         }
 149         if (offset + length > buf->used) {
 150                 length = buf->used - offset;
 151         }
 152         memmove(buf->data + offset, buf->data + offset + length, buf->used - length - offset);
 153         buf->used -= length;
 154         buf->free += length;
 155         return length;
 156 }
 157
 158 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_fix(php_http_buffer_t *buf)
 159 {
 160         if (buf->free < 1 && PHP_HTTP_BUFFER_NOMEM == php_http_buffer_resize_ex(buf, 1, 1, 0)) {
 161                 return NULL;
 162         }
 163         buf->data[buf->used] = '\0';
 164         return buf;
 165 }
 166
 167 PHP_HTTP_BUFFER_API void php_http_buffer_reset(php_http_buffer_t *buf)
 168 {
 169         buf->free += buf->used;
 170         buf->used = 0;
 171 }
 172
 173 PHP_HTTP_BUFFER_API void php_http_buffer_dtor(php_http_buffer_t *buf)
 174 {
 175         if (buf->data) {
 176                 pefree(buf->data, buf->pmem);
 177                 buf->data = NULL;
 178         }
 179         buf->used = 0;
 180         buf->free = 0;
 181 }
 182
 183 PHP_HTTP_BUFFER_API void php_http_buffer_free(php_http_buffer_t **buf)
 184 {
 185         if (*buf) {
 186                 php_http_buffer_dtor(*buf);
 187                 pefree(*buf, (*buf)->pmem);
 188                 *buf = NULL;
 189         }
 190 }
 191
 192 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)
 193 {
 194         php_http_buffer_t *storage;
 195
 196         *chunk = NULL;
 197
 198         if (!*s) {
 199                 *s = php_http_buffer_init_ex(NULL, chunk_size << 1, chunk_size ? PHP_HTTP_BUFFER_INIT_PREALLOC : 0);
 200         }
 201         storage = *s;
 202
 203         if (data_len) {
 204                 php_http_buffer_append(storage, data, data_len);
 205         }
 206
 207         if (!chunk_size) {
 208                 php_http_buffer_data(storage, chunk, &chunk_size);
 209                 php_http_buffer_free(s);
 210                 return chunk_size;
 211         }
 212
 213         if (storage->used >= chunk_size) {
 214                 *chunk = estrndup(storage->data, chunk_size);
 215                 php_http_buffer_cut(storage, 0, chunk_size);
 216                 return chunk_size;
 217         }
 218
 219         return 0;
 220 }
 221
 222 PHP_HTTP_BUFFER_API size_t 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)
 223 {
 224         char *chunk = NULL;
 225         size_t passed = 0, got = 0;
 226
 227         while ((got = php_http_buffer_chunk_buffer(s, data, data_len, &chunk, chunk_len))) {
 228                 if (PHP_HTTP_BUFFER_PASS0 == passout(opaque, chunk, got TSRMLS_CC)) {
 229                         PTR_SET(chunk, NULL);
 230                         return PHP_HTTP_BUFFER_PASS0;
 231                 }
 232                 ++passed;
 233                 if (!chunk_len) {
 234                         /*      we already got the last chunk,
 235                                 and freed all resources */
 236                         break;
 237                 }
 238                 data = NULL;
 239                 data_len = 0;
 240                 PTR_SET(chunk, NULL);
 241         }
 242         PTR_FREE(chunk);
 243         return passed;
 244 }
 245
 246 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)
 247 {
 248         size_t passed_on = 0, passed_in = php_http_buffer_chunked_input(s, chunk_size, passin, passin_arg TSRMLS_CC);
 249
 250         if (passed_in == PHP_HTTP_BUFFER_PASS0) {
 251                 return passed_in;
 252         }
 253         if (passed_in || (*s)->used) {
 254                 passed_on = passon(passon_arg, (*s)->data, (*s)->used TSRMLS_CC);
 255
 256                 if (passed_on == PHP_HTTP_BUFFER_PASS0) {
 257                         return passed_on;
 258                 }
 259
 260                 if (passed_on) {
 261                         php_http_buffer_cut(*s, 0, passed_on);
 262                 }
 263         }
 264
 265         return passed_on - passed_in;
 266 }
 267
 268 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)
 269 {
 270         php_http_buffer_t *str;
 271         size_t passed;
 272
 273         if (!*s) {
 274                 *s = php_http_buffer_init_ex(NULL, chunk_size, chunk_size ? PHP_HTTP_BUFFER_INIT_PREALLOC : 0);
 275         }
 276         str = *s;
 277
 278         php_http_buffer_resize(str, chunk_size);
 279         passed = passin(opaque, str->data + str->used, chunk_size TSRMLS_CC);
 280
 281         if (passed != PHP_HTTP_BUFFER_PASS0) {
 282                 str->used += passed;
 283                 str->free -= passed;
 284         }
 285
 286         php_http_buffer_fix(str);
 287
 288         return passed;
 289 }
 290
 291 #ifdef PHP_HTTP_BUFFER_EXTENDED
 292
 293 PHP_HTTP_BUFFER_API int php_http_buffer_cmp(php_http_buffer_t *left, php_http_buffer_t *right)
 294 {
 295         if (left->used > right->used) {
 296                 return -1;
 297         } else if (right->used > left->used) {
 298                 return 1;
 299         } else {
 300                 return memcmp(left->data, right->data, left->used);
 301         }
 302 }
 303
 304 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_copy(const php_http_buffer_t *from, php_http_buffer_t *to)
 305 {
 306         int free_to = !to;
 307
 308         to = php_http_buffer_clone(from, to);
 309
 310         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_append(to, from->data, from->used)) {
 311                 if (free_to) {
 312                         php_http_buffer_free(&to);
 313                 } else {
 314                         php_http_buffer_dtor(to);
 315                 }
 316         }
 317         return to;
 318 }
 319
 320 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)
 321 {
 322         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_resize(buf, insert_len)) {
 323                 return PHP_HTTP_BUFFER_NOMEM;
 324         }
 325         memmove(buf->data + offset + insert_len, buf->data + offset, insert_len);
 326         memcpy(buf->data + offset, insert, insert_len);
 327         buf->used += insert_len;
 328         buf->free -= insert_len;
 329         return insert_len;
 330 }
 331
 332 PHP_HTTP_BUFFER_API size_t php_http_buffer_insertf(php_http_buffer_t *buf, size_t offset, const char *format, ...)
 333 {
 334         va_list argv;
 335         char *insert;
 336         size_t insert_len, alloc;
 337
 338         va_start(argv, format);
 339         insert_len = vspprintf(&insert, 0, format, argv);
 340         va_end(argv);
 341
 342         alloc = php_http_buffer_insert(buf, insert, insert_len, offset);
 343         efree(insert);
 344
 345         if (PHP_HTTP_BUFFER_NOMEM == alloc) {
 346                 return PHP_HTTP_BUFFER_NOMEM;
 347         }
 348         return insert_len;
 349 }
 350
 351 PHP_HTTP_BUFFER_API size_t php_http_buffer_prepend(php_http_buffer_t *buf, const char *prepend, size_t prepend_len)
 352 {
 353         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_resize(buf, prepend_len)) {
 354                 return PHP_HTTP_BUFFER_NOMEM;
 355         }
 356         memmove(buf->data + prepend_len, buf->data, buf->used);
 357         memcpy(buf->data, prepend, prepend_len);
 358         buf->used += prepend_len;
 359         buf->free -= prepend_len;
 360         return prepend_len;
 361 }
 362
 363 PHP_HTTP_BUFFER_API size_t php_http_buffer_prependf(php_http_buffer_t *buf, const char *format, ...)
 364 {
 365         va_list argv;
 366         char *prepend;
 367         size_t prepend_len, alloc;
 368
 369         va_start(argv, format);
 370         prepend_len = vspprintf(&prepend, 0, format, argv);
 371         va_end(argv);
 372
 373         alloc = php_http_buffer_prepend(buf, prepend, prepend_len);
 374         efree(prepend);
 375
 376         if (PHP_HTTP_BUFFER_NOMEM == alloc) {
 377                 return PHP_HTTP_BUFFER_NOMEM;
 378         }
 379         return prepend_len;
 380 }
 381
 382 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_sub(const php_http_buffer_t *buf, size_t offset, size_t length)
 383 {
 384         if (offset >= buf->used) {
 385                 return NULL;
 386         } else {
 387                 size_t need = 1 + ((length + offset) > buf->used ? (buf->used - offset) : (length - offset));
 388                 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));
 389                 if (sub) {
 390                         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_append(sub, buf->data + offset, need)) {
 391                                 php_http_buffer_free(&sub);
 392                         } else {
 393                                 sub->size = buf->size;
 394                         }
 395                 }
 396                 return sub;
 397         }
 398 }
 399
 400 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_right(const php_http_buffer_t *buf, size_t length)
 401 {
 402         if (length < buf->used) {
 403                 return php_http_buffer_sub(buf, buf->used - length, length);
 404         } else {
 405                 return php_http_buffer_sub(buf, 0, buf->used);
 406         }
 407 }
 408
 409
 410 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_merge_va(php_http_buffer_t *buf, unsigned argc, va_list argv)
 411 {
 412         unsigned i = 0;
 413         buf = php_http_buffer_init(buf);
 414
 415         if (buf) {
 416                 while (argc > i++) {
 417                         php_http_buffer_free_t f = va_arg(argv, php_http_buffer_free_t);
 418                         php_http_buffer_t *current = va_arg(argv, php_http_buffer_t *);
 419                         php_http_buffer_append(buf, current->data, current->used);
 420                         FREE_PHP_HTTP_BUFFER(f, current);
 421                 }
 422         }
 423
 424         return buf;
 425 }
 426
 427 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_merge_ex(php_http_buffer_t *buf, unsigned argc, ...)
 428 {
 429         va_list argv;
 430         php_http_buffer_t *ret;
 431
 432         va_start(argv, argc);
 433         ret = php_http_buffer_merge_va(buf, argc, argv);
 434         va_end(argv);
 435         return ret;
 436 }
 437
 438 PHP_HTTP_BUFFER_API php_http_buffer_t *php_http_buffer_merge(unsigned argc, ...)
 439 {
 440         va_list argv;
 441         php_http_buffer_t *ret;
 442
 443         va_start(argv, argc);
 444         ret = php_http_buffer_merge_va(NULL, argc, argv);
 445         va_end(argv);
 446         return ret;
 447 }
 448
 449 #endif
 450
 451 /*
 452  * Local variables:
 453  * tab-width: 4
 454  * c-basic-offset: 4
 455  * End:
 456  * vim600: sw=4 ts=4 fdm=marker
 457  * vim<600: sw=4 ts=4
 458  */
 459