/*
- +----------------------------------------------------------------------+
- | PECL :: http |
- +----------------------------------------------------------------------+
- | This source file is subject to version 3.0 of the PHP license, that |
- | is bundled with this package in the file LICENSE, and is available |
- | through the world-wide-web at http://www.php.net/license/3_0.txt. |
- | If you did not receive a copy of the PHP license and are unable to |
- | obtain it through the world-wide-web, please send a note to |
- | license@php.net so we can mail you a copy immediately. |
- +----------------------------------------------------------------------+
- | Copyright (c) 2004-2005 Michael Wallner <mike@php.net> |
- +----------------------------------------------------------------------+
+ +--------------------------------------------------------------------+
+ | PECL :: http |
+ +--------------------------------------------------------------------+
+ | Redistribution and use in source and binary forms, with or without |
+ | modification, are permitted provided that the conditions mentioned |
+ | in the accompanying LICENSE file are met. |
+ +--------------------------------------------------------------------+
+ | Copyright (c) 2004-2006, Michael Wallner <mike@php.net> |
+ +--------------------------------------------------------------------+
*/
/* $Id$ */
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
-#include "php.h"
+#define HTTP_WANT_SAPI
+#include "php_http.h"
-#include "SAPI.h"
+#include "php_output.h"
#include "ext/standard/url.h"
-#include "php_http.h"
-#include "php_http_std_defs.h"
#include "php_http_api.h"
-#include "php_http_headers_api.h"
#include "php_http_send_api.h"
#ifdef ZEND_ENGINE_2
-# include "zend_exceptions.h"
# include "php_http_exception_object.h"
#endif
-#include <ctype.h>
+PHP_MINIT_FUNCTION(http_support)
+{
+ HTTP_LONG_CONSTANT("HTTP_SUPPORT", HTTP_SUPPORT);
+ HTTP_LONG_CONSTANT("HTTP_SUPPORT_REQUESTS", HTTP_SUPPORT_REQUESTS);
+ HTTP_LONG_CONSTANT("HTTP_SUPPORT_MAGICMIME", HTTP_SUPPORT_MAGICMIME);
+ HTTP_LONG_CONSTANT("HTTP_SUPPORT_ENCODINGS", HTTP_SUPPORT_ENCODINGS);
+ HTTP_LONG_CONSTANT("HTTP_SUPPORT_SSLREQUESTS", HTTP_SUPPORT_SSLREQUESTS);
+
+ HTTP_LONG_CONSTANT("HTTP_PARAMS_ALLOW_COMMA", HTTP_PARAMS_ALLOW_COMMA);
+ HTTP_LONG_CONSTANT("HTTP_PARAMS_ALLOW_FAILURE", HTTP_PARAMS_ALLOW_FAILURE);
+ HTTP_LONG_CONSTANT("HTTP_PARAMS_RAISE_ERROR", HTTP_PARAMS_RAISE_ERROR);
+ HTTP_LONG_CONSTANT("HTTP_PARAMS_DEFAULT", HTTP_PARAMS_DEFAULT);
+
+ return SUCCESS;
+}
+
+PHP_HTTP_API long _http_support(long feature)
+{
+ long support = HTTP_SUPPORT;
+
+#ifdef HTTP_HAVE_CURL
+ support |= HTTP_SUPPORT_REQUESTS;
+# ifdef HTTP_HAVE_SSL
+ support |= HTTP_SUPPORT_SSLREQUESTS;
+# endif
+#endif
+#ifdef HTTP_HAVE_MAGIC
+ support |= HTTP_SUPPORT_MAGICMIME;
+#endif
+#ifdef HTTP_HAVE_ZLIB
+ support |= HTTP_SUPPORT_ENCODINGS;
+#endif
-ZEND_EXTERN_MODULE_GLOBALS(http);
+ if (feature) {
+ return (feature == (support & feature));
+ }
+ return support;
+}
/* char *pretty_key(char *, size_t, zend_bool, zend_bool) */
char *_http_pretty_key(char *key, size_t key_len, zend_bool uctitle, zend_bool xhyphen)
if (key && key_len) {
size_t i;
int wasalpha;
- if (wasalpha = isalpha((int) key[0])) {
+ if ((wasalpha = isalpha((int) key[0]))) {
key[0] = (char) (uctitle ? toupper((int) key[0]) : tolower((int) key[0]));
}
for (i = 1; i < key_len; i++) {
}
/* }}} */
-/* {{{ */
-void _http_key_list_default_decoder(const char *encoded, size_t encoded_len, char **decoded, size_t *decoded_len TSRMLS_DC)
+/* {{{ void http_error(long, long, char*) */
+void _http_error_ex(long type TSRMLS_DC, long code, const char *format, ...)
{
- *decoded = estrndup(encoded, encoded_len);
- *decoded_len = (size_t) php_url_decode(*decoded, encoded_len);
+ va_list args;
+
+ va_start(args, format);
+#ifdef ZEND_ENGINE_2
+ if ((type == E_THROW) || (PG(error_handling) == EH_THROW)) {
+ char *message;
+
+ vspprintf(&message, 0, format, args);
+ zend_throw_exception(http_exception_get_for_code(code), message, code TSRMLS_CC);
+ efree(message);
+ } else
+#endif
+ php_verror(NULL, "", type, format, args TSRMLS_CC);
+ va_end(args);
}
/* }}} */
-/* {{{ */
-STATUS _http_parse_key_list(const char *list, HashTable *items, char separator, http_key_list_decode_t decode, zend_bool first_entry_is_name_value_pair TSRMLS_DC)
+/* {{{ void http_log(char *, char *, char *) */
+void _http_log_ex(char *file, const char *ident, const char *message TSRMLS_DC)
{
- const char *key = list, *val = NULL;
- int vallen = 0, keylen = 0, done = 0;
- zval array;
-
- Z_ARRVAL(array) = items;
-
- if (!(val = strchr(list, '='))) {
- return FAILURE;
- }
+ time_t now;
+ struct tm nowtm;
+ char datetime[20] = {0};
+
+ now = HTTP_GET_REQUEST_TIME();
+ strftime(datetime, sizeof(datetime), "%Y-%m-%d %H:%M:%S", php_localtime_r(&now, &nowtm));
-#define HTTP_KEYLIST_VAL(array, k, str, len) \
- { \
- char *decoded; \
- size_t decoded_len; \
- if (decode) { \
- decode(str, len, &decoded, &decoded_len TSRMLS_CC); \
- } else { \
- decoded_len = len; \
- decoded = estrndup(str, decoded_len); \
+#define HTTP_LOG_WRITE(file, type, msg) \
+ if (file && *file) { \
+ php_stream *log = php_stream_open_wrapper_ex(file, "ab", REPORT_ERRORS|ENFORCE_SAFE_MODE, NULL, HTTP_DEFAULT_STREAM_CONTEXT); \
+ \
+ if (log) { \
+ php_stream_printf(log TSRMLS_CC, "%s\t[%s]\t%s\t<%s>%s", datetime, type, msg, SG(request_info).request_uri, PHP_EOL); \
+ php_stream_close(log); \
} \
- add_assoc_stringl(array, k, decoded, decoded_len, 0); \
- }
-#define HTTP_KEYLIST_FIXKEY() \
- { \
- while (isspace(*key)) ++key; \
- keylen = val - key; \
- while (isspace(key[keylen - 1])) --keylen; \
- }
-#define HTTP_KEYLIST_FIXVAL() \
- { \
- ++val; \
- while (isspace(*val)) ++val; \
- vallen = key - val; \
- while (isspace(val[vallen - 1])) --vallen; \
- }
-
- HTTP_KEYLIST_FIXKEY();
-
- if (first_entry_is_name_value_pair) {
- HTTP_KEYLIST_VAL(&array, "name", key, keylen);
-
- /* just one name=value */
- if (!(key = strchr(val, separator))) {
- key = val + strlen(val);
- HTTP_KEYLIST_FIXVAL();
- HTTP_KEYLIST_VAL(&array, "value", val, vallen);
- return SUCCESS;
- }
- /* additional info appended */
- else {
- HTTP_KEYLIST_FIXVAL();
- HTTP_KEYLIST_VAL(&array, "value", val, vallen);
- }
+ \
}
-
- do {
- char *keydup = NULL;
-
- if (!(val = strchr(key, '='))) {
- break;
- }
-
- /* start at 0 if first_entry_is_name_value_pair==0 */
- if (zend_hash_num_elements(items)) {
- ++key;
- }
-
- HTTP_KEYLIST_FIXKEY();
- keydup = estrndup(key, keylen);
- if (!(key = strchr(val, separator))) {
- done = 1;
- key = val + strlen(val);
- }
- HTTP_KEYLIST_FIXVAL();
- HTTP_KEYLIST_VAL(&array, keydup, val, vallen);
- efree(keydup);
- } while (!done);
-
- return SUCCESS;
+
+ HTTP_LOG_WRITE(file, ident, message);
+ HTTP_LOG_WRITE(HTTP_G->log.composite, ident, message);
}
/* }}} */
-/* {{{ void http_error(long, long, char*) */
-void _http_error_ex(long type, long code, const char *format, ...)
+static void http_ob_blackhole(char *output, uint output_len, char **handled_output, uint *handled_output_len, int mode TSRMLS_DC)
{
- va_list args;
- TSRMLS_FETCH();
-
- va_start(args, format);
- if (type == E_THROW) {
-#ifdef ZEND_ENGINE_2
- char *message;
- vspprintf(&message, 0, format, args);
- zend_throw_exception(http_exception_get_for_code(code), message, code TSRMLS_CC);
-#else
- type = E_WARNING;
-#endif
- }
- if (type != E_THROW) {
- php_verror(NULL, "", type, format, args TSRMLS_CC);
- }
- va_end(args);
+ *handled_output = ecalloc(1,1);
+ *handled_output_len = 0;
}
-/* }}} */
-/* {{{ STATUS http_exit(int, char*, char*, zend_bool) */
+/* {{{ STATUS http_exit(int, char*, char*) */
STATUS _http_exit_ex(int status, char *header, char *body, zend_bool send_header TSRMLS_DC)
{
- char datetime[128];
-
- if (SUCCESS != http_send_status_header(status, send_header ? header : NULL)) {
+ if ( (send_header && (SUCCESS != http_send_status_header(status, header))) ||
+ (!send_header && status && (SUCCESS != http_send_status(status)))) {
http_error_ex(HE_WARNING, HTTP_E_HEADER, "Failed to exit with status/header: %d - %s", status, header ? header : "");
STR_FREE(header);
STR_FREE(body);
return FAILURE;
}
- if (body) {
- PHPWRITE(body, strlen(body));
- }
- {
- time_t now;
- struct tm nowtm;
-
- time(&now);
- strftime(datetime, sizeof(datetime), "%Y-%m-%d %H:%M:%S", php_localtime_r(&now, &nowtm));
+
+ if (!OG(ob_lock)) {
+ php_end_ob_buffers(0 TSRMLS_CC);
}
-
-#define HTTP_LOG_WRITE(for, type, header) \
- HTTP_LOG_WRITE_EX(for, type, header); \
- HTTP_LOG_WRITE_EX(composite, type, header);
-
-#define HTTP_LOG_WRITE_EX(for, type, header) \
- if (HTTP_G(log).##for && strlen(HTTP_G(log).##for)) { \
- php_stream *log = php_stream_open_wrapper(HTTP_G(log).##for, "ab", REPORT_ERRORS|ENFORCE_SAFE_MODE, NULL); \
- \
- if (log) { \
- php_stream_printf(log TSRMLS_CC, "%s [%12s] %32s <%s>%s", datetime, type, header, SG(request_info).request_uri, PHP_EOL); \
- php_stream_close(log); \
- } \
- \
+ if ((SUCCESS == sapi_send_headers(TSRMLS_C)) && body) {
+ PHPWRITE(body, strlen(body));
}
- switch (status)
- {
- case 301: HTTP_LOG_WRITE(redirect, "301-REDIRECT", header); break;
- case 302: HTTP_LOG_WRITE(redirect, "302-REDIRECT", header); break;
- case 304: HTTP_LOG_WRITE(cache, "304-CACHE", header); break;
- case 401: HTTP_LOG_WRITE(auth, "401-AUTH", header); break;
- case 403: HTTP_LOG_WRITE(auth, "403-AUTH", header); break;
- case 405: HTTP_LOG_WRITE(allowed_methods, "405-ALLOWED", header); break;
+
+ switch (status) {
+ case 301: http_log(HTTP_G->log.redirect, "301-REDIRECT", header); break;
+ case 302: http_log(HTTP_G->log.redirect, "302-REDIRECT", header); break;
+ case 303: http_log(HTTP_G->log.redirect, "303-REDIRECT", header); break;
+ case 305: http_log(HTTP_G->log.redirect, "305-REDIRECT", header); break;
+ case 307: http_log(HTTP_G->log.redirect, "307-REDIRECT", header); break;
+ case 304: http_log(HTTP_G->log.cache, "304-CACHE", header); break;
+ case 405: http_log(HTTP_G->log.allowed_methods, "405-ALLOWED", header); break;
+ default: http_log(NULL, header, body); break;
}
+
STR_FREE(header);
STR_FREE(body);
- zend_bailout();
- /* fake */
+
+ if (HTTP_G->force_exit) {
+ zend_bailout();
+ } else {
+ php_ob_set_internal_handler(http_ob_blackhole, 4096, "blackhole", 0 TSRMLS_CC);
+ }
+
return SUCCESS;
}
/* }}} */
if ( (found = strstr(methods, method)) &&
(found == method || !isalpha(found[-1])) &&
- (!isalpha(found[strlen(method) + 1]))) {
+ (strlen(found) >= strlen(method) && !isalpha(found[strlen(method)]))) {
return SUCCESS;
}
return FAILURE;
{
zval **hsv;
zval **var;
-
- if (SUCCESS != zend_hash_find(&EG(symbol_table), "_SERVER", sizeof("_SERVER"), (void **) &hsv)) {
+#ifdef ZEND_ENGINE_2
+ zend_is_auto_global("_SERVER", lenof("_SERVER") TSRMLS_CC);
+#endif
+ if ((SUCCESS != zend_hash_find(&EG(symbol_table), "_SERVER", sizeof("_SERVER"), (void *) &hsv)) || (Z_TYPE_PP(hsv) != IS_ARRAY)) {
return NULL;
}
- if (SUCCESS != zend_hash_find(Z_ARRVAL_PP(hsv), (char *) key, key_size, (void **) &var)) {
+ if ((SUCCESS != zend_hash_find(Z_ARRVAL_PP(hsv), (char *) key, key_size, (void *) &var)) || (Z_TYPE_PP(var) != IS_STRING)) {
return NULL;
}
if (check && !(Z_STRVAL_PP(var) && Z_STRLEN_PP(var))) {
{
*length = 0;
*body = NULL;
-
+
if (SG(request_info).raw_post_data) {
*length = SG(request_info).raw_post_data_length;
- *body = (char *) (dup ? estrndup(SG(request_info).raw_post_data, *length) : SG(request_info).raw_post_data);
+ *body = SG(request_info).raw_post_data;
+
+ if (dup) {
+ *body = estrndup(*body, *length);
+ }
+ return SUCCESS;
+ } else if (sapi_module.read_post && !HTTP_G->read_post_data) {
+ char buf[4096];
+ int len;
+
+ HTTP_G->read_post_data = 1;
+
+ while (0 < (len = sapi_module.read_post(buf, sizeof(buf) TSRMLS_CC))) {
+ *body = erealloc(*body, *length + len + 1);
+ memcpy(*body + *length, buf, len);
+ *length += len;
+ (*body)[*length] = '\0';
+ }
+
+ /* check for error */
+ if (len < 0) {
+ STR_FREE(*body);
+ *length = 0;
+ return FAILURE;
+ }
+
+ SG(request_info).raw_post_data = *body;
+ SG(request_info).raw_post_data_length = *length;
+
+ if (dup) {
+ *body = estrndup(*body, *length);
+ }
return SUCCESS;
}
+
return FAILURE;
}
/* }}} */
-/* {{{ char *http_chunked_decode(char *, size_t, char **, size_t *) */
-PHP_HTTP_API const char *_http_chunked_decode(const char *encoded, size_t encoded_len, char **decoded, size_t *decoded_len TSRMLS_DC)
+/* {{{ php_stream *http_get_request_body_stream(void) */
+PHP_HTTP_API php_stream *_http_get_request_body_stream(TSRMLS_D)
{
- const char *e_ptr;
- char *d_ptr;
+ php_stream *s = NULL;
- *decoded_len = 0;
- *decoded = ecalloc(1, encoded_len);
- d_ptr = *decoded;
- e_ptr = encoded;
-
- while (((e_ptr - encoded) - encoded_len) > 0) {
- size_t chunk_len = 0, EOL_len = 0;
- int eol_mismatch = 0;
- char *n_ptr;
+ if (SG(request_info).raw_post_data) {
+ s = php_stream_open_wrapper("php://input", "rb", 0, NULL);
+ } else if (sapi_module.read_post && !HTTP_G->read_post_data) {
+ HTTP_G->read_post_data = 1;
+
+ if ((s = php_stream_temp_new())) {
+ char buf[4096];
+ int len;
+
+ while (0 < (len = sapi_module.read_post(buf, sizeof(buf) TSRMLS_CC))) {
+ php_stream_write(s, buf, len);
+ }
+
+ if (len < 0) {
+ php_stream_close(s);
+ s = NULL;
+ } else {
+ php_stream_rewind(s);
+ }
+ }
+ }
+
+ return s;
+}
+/* }}} */
- chunk_len = strtol(e_ptr, &n_ptr, 16);
+/* {{{ void http_parse_params_default_callback(...) */
+PHP_HTTP_API void _http_parse_params_default_callback(void *arg, const char *key, int keylen, const char *val, int vallen TSRMLS_DC)
+{
+ char *kdup;
+ zval tmp, *entry;
+ HashTable *ht = (HashTable *) arg;
+
+ if (ht) {
+ INIT_ZARR(tmp, ht);
+
+ if (vallen) {
+ MAKE_STD_ZVAL(entry);
+ array_init(entry);
+ kdup = estrndup(key, keylen);
+ add_assoc_stringl_ex(entry, kdup, keylen + 1, (char *) val, vallen, 1);
+ efree(kdup);
+ add_next_index_zval(&tmp, entry);
+ } else {
+ add_next_index_stringl(&tmp, (char *) key, keylen, 1);
+ }
+ }
+}
+/* }}} */
- /* check if:
- * - we could not read in chunk size
- * - chunk size is not followed by (CR)LF|NUL
- */
- if ((n_ptr == e_ptr) || (*n_ptr && (eol_mismatch = n_ptr != http_locate_eol(e_ptr, &EOL_len)))) {
- /* don't fail on apperently not encoded data */
- if (e_ptr == encoded) {
- memcpy(*decoded, encoded, encoded_len);
- *decoded_len = encoded_len;
- return encoded + encoded_len;
+/* {{{ STATUS http_parse_params(const char *, HashTable *) */
+PHP_HTTP_API STATUS _http_parse_params_ex(const char *param, int flags, http_parse_params_callback cb, void *cb_arg TSRMLS_DC)
+{
+#define ST_QUOTE 1
+#define ST_VALUE 2
+#define ST_KEY 3
+#define ST_ASSIGN 4
+#define ST_ADD 5
+
+ int st = ST_KEY, keylen = 0, vallen = 0;
+ char *s, *c, *key = NULL, *val = NULL;
+
+ for(c = s = estrdup(param);;) {
+#if 0
+ char *tk = NULL, *tv = NULL;
+
+ if (key) {
+ if (keylen) {
+ tk= estrndup(key, keylen);
} else {
- efree(*decoded);
- if (eol_mismatch) {
- if (EOL_len == 2) {
- http_error_ex(HE_WARNING, HTTP_E_ENCODING, "Invalid character (expected 0x0D 0x0A; got: 0x%X 0x%X)", *n_ptr, *(n_ptr + 1));
+ tk = ecalloc(1, 7);
+ memcpy(tk, key, 3);
+ tk[3]='.'; tk[4]='.'; tk[5]='.';
+ }
+ }
+ if (val) {
+ if (vallen) {
+ tv = estrndup(val, vallen);
+ } else {
+ tv = ecalloc(1, 7);
+ memcpy(tv, val, 3);
+ tv[3]='.'; tv[4]='.'; tv[5]='.';
+ }
+ }
+ fprintf(stderr, "[%6s] %c \"%s=%s\"\n",
+ (
+ st == ST_QUOTE ? "QUOTE" :
+ st == ST_VALUE ? "VALUE" :
+ st == ST_KEY ? "KEY" :
+ st == ST_ASSIGN ? "ASSIGN" :
+ st == ST_ADD ? "ADD":
+ "HUH?"
+ ), *c?*c:'0', tk, tv
+ );
+ STR_FREE(tk); STR_FREE(tv);
+#endif
+ continued:
+ switch (st) {
+ case ST_QUOTE:
+ quote:
+ if (*c == '"') {
+ if (*(c-1) == '\\') {
+ memmove(c-1, c, strlen(c)+1);
+ goto quote;
} else {
- http_error_ex(HE_WARNING, HTTP_E_ENCODING, "Invalid character (expected 0x0A; got: 0x%X)", *n_ptr);
+ goto add;
+ }
+ } else {
+ if (!val) {
+ val = c;
+ }
+ if (!*c) {
+ --val;
+ st = ST_ADD;
+ }
+ }
+ break;
+
+ case ST_VALUE:
+ switch (*c) {
+ case '"':
+ if (!val) {
+ st = ST_QUOTE;
+ }
+ break;
+
+ case ' ':
+ break;
+
+ case ';':
+ case '\0':
+ goto add;
+ break;
+ case ',':
+ if (flags & HTTP_PARAMS_ALLOW_COMMA) {
+ goto add;
+ }
+ default:
+ if (!val) {
+ val = c;
+ }
+ break;
+ }
+ break;
+
+ case ST_KEY:
+ switch (*c) {
+ case ',':
+ if (flags & HTTP_PARAMS_ALLOW_COMMA) {
+ goto allow_comma;
+ }
+ case '\r':
+ case '\n':
+ case '\t':
+ case '\013':
+ case '\014':
+ goto failure;
+ break;
+
+ case '=':
+ if (key) {
+ keylen = c - key;
+ st = ST_VALUE;
+ } else {
+ goto failure;
+ }
+ break;
+
+ case ' ':
+ if (key) {
+ keylen = c - key;
+ st = ST_ASSIGN;
+ }
+ break;
+
+ case ';':
+ case '\0':
+ allow_comma:
+ if (key) {
+ keylen = c-- - key;
+ st = ST_ADD;
+ }
+ break;
+
+ default:
+ if (!key) {
+ key = c;
+ }
+ break;
+ }
+ break;
+
+ case ST_ASSIGN:
+ if (*c == '=') {
+ st = ST_VALUE;
+ } else if (!*c || *c == ';' || ((flags & HTTP_PARAMS_ALLOW_COMMA) && *c == ',')) {
+ st = ST_ADD;
+ } else if (*c != ' ') {
+ goto failure;
+ }
+ break;
+
+ case ST_ADD:
+ add:
+ if (val) {
+ vallen = c - val;
+ if (st != ST_QUOTE) {
+ while (val[vallen-1] == ' ') --vallen;
}
} else {
- char *error = estrndup(n_ptr, strcspn(n_ptr, "\r\n "));
- http_error_ex(HE_WARNING, HTTP_E_ENCODING, "Invalid chunk size: '%s' at pos %d", error, n_ptr - encoded);
- efree(error);
+ val = "";
+ vallen = 0;
}
-
- return NULL;
- }
- } else {
- e_ptr = n_ptr;
+
+ cb(cb_arg, key, keylen, val, vallen TSRMLS_CC);
+
+ st = ST_KEY;
+ key = val = NULL;
+ keylen = vallen = 0;
+ break;
}
-
- /* reached the end */
- if (!chunk_len) {
+ if (*c) {
+ ++c;
+ } else if (st == ST_ADD) {
+ goto add;
+ } else {
break;
}
-
- memcpy(d_ptr, e_ptr += EOL_len, chunk_len);
- d_ptr += chunk_len;
- e_ptr += chunk_len + EOL_len;
- *decoded_len += chunk_len;
}
-
- return e_ptr;
+
+ efree(s);
+ return SUCCESS;
+
+failure:
+ if (flags & HTTP_PARAMS_RAISE_ERROR) {
+ http_error_ex(HE_WARNING, HTTP_E_INVALID_PARAM, "Unexpected character (%c) at pos %tu of %zu", *c, c-s, strlen(s));
+ }
+ if (flags & HTTP_PARAMS_ALLOW_FAILURE) {
+ --c;
+ st = ST_ADD;
+ goto continued;
+ }
+ efree(s);
+ return FAILURE;
}
/* }}} */
projects / m6w6 / ext-http / blobdiff