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   1
   2 /* $Id: php_http_buffer.c 211942 2006-04-24 17:17:09Z mike $ */
   3
   4 #include "php.h"
   5 #include "php_http_buffer.h"
   6
   7 PHP_HTTP_BUFFER_API php_http_buffer *php_http_buffer_init_ex(php_http_buffer *buf, size_t chunk_size, int flags)
   8 {
   9         if (!buf) {
  10                 buf = pemalloc(sizeof(php_http_buffer), flags & PHP_HTTP_BUFFER_INIT_PERSISTENT);
  11         }
  12
  13         if (buf) {
  14                 buf->size = (chunk_size) ? chunk_size : PHP_HTTP_BUFFER_DEFAULT_SIZE;
  15                 buf->pmem = (flags & PHP_HTTP_BUFFER_INIT_PERSISTENT) ? 1 : 0;
  16                 buf->data = (flags & PHP_HTTP_BUFFER_INIT_PREALLOC) ? pemalloc(buf->size, buf->pmem) : NULL;
  17                 buf->free = (flags & PHP_HTTP_BUFFER_INIT_PREALLOC) ? buf->size : 0;
  18                 buf->used = 0;
  19         }
  20
  21         return buf;
  22 }
  23
  24 PHP_HTTP_BUFFER_API php_http_buffer *php_http_buffer_from_string_ex(php_http_buffer *buf, const char *string, size_t length)
  25 {
  26         if ((buf = php_http_buffer_init(buf))) {
  27                 if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_append(buf, string, length)) {
  28                         pefree(buf, buf->pmem);
  29                         buf = NULL;
  30                 }
  31         }
  32         return buf;
  33 }
  34
  35 PHP_HTTP_BUFFER_API size_t php_http_buffer_resize_ex(php_http_buffer *buf, size_t len, size_t override_size, int allow_error)
  36 {
  37         char *ptr = NULL;
  38 #if 0
  39         fprintf(stderr, "RESIZE: size=%lu, used=%lu, free=%lu\n", buf->size, buf->used, buf->free);
  40 #endif
  41         if (buf->free < len) {
  42                 size_t size = override_size ? override_size : buf->size;
  43
  44                 while ((size + buf->free) < len) {
  45                         size <<= 1;
  46                 }
  47
  48                 if (allow_error) {
  49                         ptr = perealloc_recoverable(buf->data, buf->used + buf->free + size, buf->pmem);
  50                 } else {
  51                         ptr = perealloc(buf->data, buf->used + buf->free + size, buf->pmem);
  52                 }
  53
  54                 if (ptr) {
  55                         buf->data = ptr;
  56                 } else {
  57                         return PHP_HTTP_BUFFER_NOMEM;
  58                 }
  59
  60                 buf->free += size;
  61                 return size;
  62         }
  63         return 0;
  64 }
  65
  66 PHP_HTTP_BUFFER_API size_t php_http_buffer_shrink(php_http_buffer *buf)
  67 {
  68         /* avoid another realloc on fixation */
  69         if (buf->free > 1) {
  70                 char *ptr = perealloc(buf->data, buf->used + 1, buf->pmem);
  71
  72                 if (ptr) {
  73                         buf->data = ptr;
  74                 } else {
  75                         return PHP_HTTP_BUFFER_NOMEM;
  76                 }
  77                 buf->free = 1;
  78         }
  79         return buf->used;
  80 }
  81
  82 PHP_HTTP_BUFFER_API size_t php_http_buffer_append(php_http_buffer *buf, const char *append, size_t append_len)
  83 {
  84         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_resize(buf, append_len)) {
  85                 return PHP_HTTP_BUFFER_NOMEM;
  86         }
  87         memcpy(buf->data + buf->used, append, append_len);
  88         buf->used += append_len;
  89         buf->free -= append_len;
  90         return append_len;
  91 }
  92
  93 PHP_HTTP_BUFFER_API size_t php_http_buffer_appendf(php_http_buffer *buf, const char *format, ...)
  94 {
  95         va_list argv;
  96         char *append;
  97         size_t append_len, alloc;
  98
  99         va_start(argv, format);
 100         append_len = vspprintf(&append, 0, format, argv);
 101         va_end(argv);
 102
 103         alloc = php_http_buffer_append(buf, append, append_len);
 104         efree(append);
 105
 106         if (PHP_HTTP_BUFFER_NOMEM == alloc) {
 107                 return PHP_HTTP_BUFFER_NOMEM;
 108         }
 109         return append_len;
 110 }
 111
 112 PHP_HTTP_BUFFER_API size_t php_http_buffer_insert(php_http_buffer *buf, const char *insert, size_t insert_len, size_t offset)
 113 {
 114         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_resize(buf, insert_len)) {
 115                 return PHP_HTTP_BUFFER_NOMEM;
 116         }
 117         memmove(buf->data + offset + insert_len, buf->data + offset, insert_len);
 118         memcpy(buf->data + offset, insert, insert_len);
 119         buf->used += insert_len;
 120         buf->free -= insert_len;
 121         return insert_len;
 122 }
 123
 124 PHP_HTTP_BUFFER_API size_t php_http_buffer_insertf(php_http_buffer *buf, size_t offset, const char *format, ...)
 125 {
 126         va_list argv;
 127         char *insert;
 128         size_t insert_len, alloc;
 129
 130         va_start(argv, format);
 131         insert_len = vspprintf(&insert, 0, format, argv);
 132         va_end(argv);
 133
 134         alloc = php_http_buffer_insert(buf, insert, insert_len, offset);
 135         efree(insert);
 136
 137         if (PHP_HTTP_BUFFER_NOMEM == alloc) {
 138                 return PHP_HTTP_BUFFER_NOMEM;
 139         }
 140         return insert_len;
 141 }
 142
 143 PHP_HTTP_BUFFER_API size_t php_http_buffer_prepend(php_http_buffer *buf, const char *prepend, size_t prepend_len)
 144 {
 145         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_resize(buf, prepend_len)) {
 146                 return PHP_HTTP_BUFFER_NOMEM;
 147         }
 148         memmove(buf->data + prepend_len, buf->data, buf->used);
 149         memcpy(buf->data, prepend, prepend_len);
 150         buf->used += prepend_len;
 151         buf->free -= prepend_len;
 152         return prepend_len;
 153 }
 154
 155 PHP_HTTP_BUFFER_API size_t php_http_buffer_prependf(php_http_buffer *buf, const char *format, ...)
 156 {
 157         va_list argv;
 158         char *prepend;
 159         size_t prepend_len, alloc;
 160
 161         va_start(argv, format);
 162         prepend_len = vspprintf(&prepend, 0, format, argv);
 163         va_end(argv);
 164
 165         alloc = php_http_buffer_prepend(buf, prepend, prepend_len);
 166         efree(prepend);
 167
 168         if (PHP_HTTP_BUFFER_NOMEM == alloc) {
 169                 return PHP_HTTP_BUFFER_NOMEM;
 170         }
 171         return prepend_len;
 172 }
 173
 174 PHP_HTTP_BUFFER_API char *php_http_buffer_data(const php_http_buffer *buf, char **into, size_t *len)
 175 {
 176         char *copy = ecalloc(1, buf->used + 1);
 177         memcpy(copy, buf->data, buf->used);
 178         if (into) {
 179                 *into = copy;
 180         }
 181         if (len) {
 182                 *len = buf->used;
 183         }
 184         return copy;
 185 }
 186
 187 PHP_HTTP_BUFFER_API php_http_buffer *php_http_buffer_dup(const php_http_buffer *buf)
 188 {
 189         php_http_buffer *dup = php_http_buffer_clone(buf);
 190         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_append(dup, buf->data, buf->used)) {
 191                 php_http_buffer_free(&dup);
 192         }
 193         return dup;
 194 }
 195
 196 PHP_HTTP_BUFFER_API size_t php_http_buffer_cut(php_http_buffer *buf, size_t offset, size_t length)
 197 {
 198         if (offset > buf->used) {
 199                 return 0;
 200         }
 201         if (offset + length > buf->used) {
 202                 length = buf->used - offset;
 203         }
 204         memmove(buf->data + offset, buf->data + offset + length, buf->used - length - offset);
 205         buf->used -= length;
 206         buf->free += length;
 207         return length;
 208 }
 209
 210 PHP_HTTP_BUFFER_API php_http_buffer *php_http_buffer_sub(const php_http_buffer *buf, size_t offset, size_t length)
 211 {
 212         if (offset >= buf->used) {
 213                 return NULL;
 214         } else {
 215                 size_t need = 1 + ((length + offset) > buf->used ? (buf->used - offset) : (length - offset));
 216                 php_http_buffer *sub = php_http_buffer_init_ex(NULL, need, PHP_HTTP_BUFFER_INIT_PREALLOC | (buf->pmem ? PHP_HTTP_BUFFER_INIT_PERSISTENT:0));
 217                 if (sub) {
 218                         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_append(sub, buf->data + offset, need)) {
 219                                 php_http_buffer_free(&sub);
 220                         } else {
 221                                 sub->size = buf->size;
 222                         }
 223                 }
 224                 return sub;
 225         }
 226 }
 227
 228 PHP_HTTP_BUFFER_API php_http_buffer *php_http_buffer_right(const php_http_buffer *buf, size_t length)
 229 {
 230         if (length < buf->used) {
 231                 return php_http_buffer_sub(buf, buf->used - length, length);
 232         } else {
 233                 return php_http_buffer_sub(buf, 0, buf->used);
 234         }
 235 }
 236
 237
 238 PHP_HTTP_BUFFER_API php_http_buffer *php_http_buffer_merge_va(php_http_buffer *buf, unsigned argc, va_list argv)
 239 {
 240         unsigned i = 0;
 241         buf = php_http_buffer_init(buf);
 242
 243         if (buf) {
 244                 while (argc > i++) {
 245                         php_http_buffer_free_t f = va_arg(argv, php_http_buffer_free_t);
 246                         php_http_buffer *current = va_arg(argv, php_http_buffer *);
 247                         php_http_buffer_append(buf, current->data, current->used);
 248                         FREE_PHP_HTTP_BUFFER(f, current);
 249                 }
 250         }
 251
 252         return buf;
 253 }
 254
 255 PHP_HTTP_BUFFER_API php_http_buffer *php_http_buffer_merge_ex(php_http_buffer *buf, unsigned argc, ...)
 256 {
 257         va_list argv;
 258         php_http_buffer *ret;
 259
 260         va_start(argv, argc);
 261         ret = php_http_buffer_merge_va(buf, argc, argv);
 262         va_end(argv);
 263         return ret;
 264 }
 265
 266 PHP_HTTP_BUFFER_API php_http_buffer *php_http_buffer_merge(unsigned argc, ...)
 267 {
 268         va_list argv;
 269         php_http_buffer *ret;
 270
 271         va_start(argv, argc);
 272         ret = php_http_buffer_merge_va(NULL, argc, argv);
 273         va_end(argv);
 274         return ret;
 275 }
 276
 277 PHP_HTTP_BUFFER_API php_http_buffer *php_http_buffer_fix(php_http_buffer *buf)
 278 {
 279         if (PHP_HTTP_BUFFER_NOMEM == php_http_buffer_resize_ex(buf, 1, 1, 0)) {
 280                 return NULL;
 281         }
 282         buf->data[buf->used] = '\0';
 283         return buf;
 284 }
 285
 286 PHP_HTTP_BUFFER_API int php_http_buffer_cmp(php_http_buffer *left, php_http_buffer *right)
 287 {
 288         if (left->used > right->used) {
 289                 return -1;
 290         } else if (right->used > left->used) {
 291                 return 1;
 292         } else {
 293                 return memcmp(left->data, right->data, left->used);
 294         }
 295 }
 296
 297 PHP_HTTP_BUFFER_API void php_http_buffer_reset(php_http_buffer *buf)
 298 {
 299         buf->free += buf->used;
 300         buf->used = 0;
 301 }
 302
 303 PHP_HTTP_BUFFER_API void php_http_buffer_dtor(php_http_buffer *buf)
 304 {
 305         if (buf->data) {
 306                 pefree(buf->data, buf->pmem);
 307                 buf->data = NULL;
 308         }
 309         buf->used = 0;
 310         buf->free = 0;
 311 }
 312
 313 PHP_HTTP_BUFFER_API void php_http_buffer_free(php_http_buffer **buf)
 314 {
 315         if (*buf) {
 316                 php_http_buffer_dtor(*buf);
 317                 pefree(*buf, (*buf)->pmem);
 318                 *buf = NULL;
 319         }
 320 }
 321
 322 PHP_HTTP_BUFFER_API size_t php_http_buffer_chunk_buffer(php_http_buffer **s, const char *data, size_t data_len, char **chunk, size_t chunk_size)
 323 {
 324         php_http_buffer *storage;
 325
 326         *chunk = NULL;
 327
 328         if (!*s) {
 329                 *s = php_http_buffer_init_ex(NULL, chunk_size << 1, chunk_size ? PHP_HTTP_BUFFER_INIT_PREALLOC : 0);
 330         }
 331         storage = *s;
 332
 333         if (data_len) {
 334                 php_http_buffer_append(storage, data, data_len);
 335         }
 336
 337         if (!chunk_size) {
 338                 php_http_buffer_data(storage, chunk, &chunk_size);
 339                 php_http_buffer_free(s);
 340                 return chunk_size;
 341         }
 342
 343         if (storage->used >= (chunk_size = storage->size >> 1)) {
 344                 *chunk = estrndup(storage->data, chunk_size);
 345                 php_http_buffer_cut(storage, 0, chunk_size);
 346                 return chunk_size;
 347         }
 348
 349         return 0;
 350 }
 351
 352 PHP_HTTP_BUFFER_API void php_http_buffer_chunked_output(php_http_buffer **s, const char *data, size_t data_len, size_t chunk_len, php_http_buffer_pass_func_t passout, void *opaque TSRMLS_DC)
 353 {
 354         char *chunk = NULL;
 355         size_t got = 0;
 356
 357         while ((got = php_http_buffer_chunk_buffer(s, data, data_len, &chunk, chunk_len))) {
 358                 passout(opaque, chunk, got TSRMLS_CC);
 359                 if (!chunk_len) {
 360                         /*      we already got the last chunk,
 361                                 and freed all resources */
 362                         break;
 363                 }
 364                 data = NULL;
 365                 data_len = 0;
 366                 STR_SET(chunk, NULL);
 367         }
 368         STR_FREE(chunk);
 369 }
 370
 371 PHP_HTTP_BUFFER_API ssize_t php_http_buffer_passthru(php_http_buffer *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)
 372 {
 373         size_t passed_on = 0, passed_in = php_http_buffer_chunked_input(&s, chunk_size, passin, passin_arg TSRMLS_CC);
 374
 375         if (passed_in == PHP_HTTP_BUFFER_PASS0) {
 376                 return passed_in;
 377         }
 378         if (passed_in) {
 379                 passed_on = passon(passon_arg, s->data, passed_in TSRMLS_CC);
 380
 381                 if (passed_on == PHP_HTTP_BUFFER_PASS0) {
 382                         return passed_on;
 383                 }
 384
 385                 if (passed_on) {
 386                         php_http_buffer_cut(s, 0, passed_on);
 387                 }
 388         }
 389
 390         return passed_on - passed_in;
 391 }
 392
 393 PHP_HTTP_BUFFER_API size_t php_http_buffer_chunked_input(php_http_buffer **s, size_t chunk_size, php_http_buffer_pass_func_t passin, void *opaque TSRMLS_DC)
 394 {
 395         php_http_buffer *str;
 396         size_t passed;
 397
 398         if (!*s) {
 399                 *s = php_http_buffer_init_ex(NULL, chunk_size, chunk_size ? PHP_HTTP_BUFFER_INIT_PREALLOC : 0);
 400         }
 401         str = *s;
 402
 403         php_http_buffer_resize(str, chunk_size);
 404         passed = passin(opaque, str->data + str->used, chunk_size TSRMLS_CC);
 405
 406         if (passed != PHP_HTTP_BUFFER_PASS0) {
 407                 str->used += passed;
 408                 str->free -= passed;
 409         }
 410
 411         php_http_buffer_fix(str);
 412
 413         return passed;
 414 }
 415
 416 /*
 417  * Local variables:
 418  * tab-width: 4
 419  * c-basic-offset: 4
 420  * End:
 421  * vim600: sw=4 ts=4 fdm=marker
 422  * vim<600: sw=4 ts=4
 423  */
 424