+#include "ext/standard/crc32.h"
+#include "ext/standard/sha1.h"
+#include "ext/standard/md5.h"
+
+#ifdef HTTP_HAVE_HASH
+# include "php_hash.h"
+#endif
+
+#define http_etag_digest(d, l) _http_etag_digest((d), (l))
+static inline char *_http_etag_digest(const unsigned char *digest, int len)
+{
+ static const char hexdigits[17] = "0123456789abcdef";
+ int i;
+ char *hex = emalloc(len * 2 + 1);
+ char *ptr = hex;
+
+ for (i = 0; i < len; ++i) {
+ *ptr++ = hexdigits[digest[i] >> 4];
+ *ptr++ = hexdigits[digest[i] & 0xF];
+ }
+ *ptr = '\0';
+
+ return hex;
+}
+
+#define http_etag_init() _http_etag_init(TSRMLS_C)
+static inline void *_http_etag_init(TSRMLS_D)
+{
+ void *ctx = NULL;
+ char *mode = HTTP_G->etag.mode;
+
+#ifdef HTTP_HAVE_HASH
+ const php_hash_ops *eho = NULL;
+
+ if (mode && (eho = php_hash_fetch_ops(mode, strlen(mode)))) {
+ ctx = emalloc(eho->context_size);
+ eho->hash_init(ctx);
+ } else
+#endif
+ if (mode && ((!strcasecmp(mode, "crc32")) || (!strcasecmp(mode, "crc32b")))) {
+ ctx = emalloc(sizeof(uint));
+ *((uint *) ctx) = ~0;
+ } else if (mode && !strcasecmp(mode, "sha1")) {
+ PHP_SHA1Init(ctx = emalloc(sizeof(PHP_SHA1_CTX)));
+ } else {
+ PHP_MD5Init(ctx = emalloc(sizeof(PHP_MD5_CTX)));
+ }
+
+ return ctx;
+}
+
+#define http_etag_finish(c) _http_etag_finish((c) TSRMLS_CC)
+static inline char *_http_etag_finish(void *ctx TSRMLS_DC)
+{
+ unsigned char digest[128] = {0};
+ char *etag = NULL, *mode = HTTP_G->etag.mode;
+
+#ifdef HTTP_HAVE_HASH
+ const php_hash_ops *eho = NULL;
+
+ if (mode && (eho = php_hash_fetch_ops(mode, strlen(mode)))) {
+ eho->hash_final(digest, ctx);
+ etag = http_etag_digest(digest, eho->digest_size);
+ } else
+#endif
+ if (mode && ((!strcasecmp(mode, "crc32")) || (!strcasecmp(mode, "crc32b")))) {
+ *((uint *) ctx) = ~*((uint *) ctx);
+ etag = http_etag_digest((const unsigned char *) ctx, sizeof(uint));
+ } else if (mode && (!strcasecmp(mode, "sha1"))) {
+ PHP_SHA1Final(digest, ctx);
+ etag = http_etag_digest(digest, 20);
+ } else {
+ PHP_MD5Final(digest, ctx);
+ etag = http_etag_digest(digest, 16);
+ }
+ efree(ctx);
+
+ return etag;
+}
+
+#define http_etag_update(c, d, l) _http_etag_update((c), (d), (l) TSRMLS_CC)
+static inline void _http_etag_update(void *ctx, const char *data_ptr, size_t data_len TSRMLS_DC)
+{
+ char *mode = HTTP_G->etag.mode;
+#ifdef HTTP_HAVE_HASH
+ const php_hash_ops *eho = NULL;
+
+ if (mode && (eho = php_hash_fetch_ops(mode, strlen(mode)))) {
+ eho->hash_update(ctx, (const unsigned char *) data_ptr, data_len);
+ } else
+#endif
+ if (mode && ((!strcasecmp(mode, "crc32")) || (!strcasecmp(mode, "crc32b")))) {
+ uint i, c = *((uint *) ctx);
+ for (i = 0; i < data_len; ++i) {
+ CRC32(c, data_ptr[i]);
+ }
+ *((uint *)ctx) = c;
+ } else if (mode && (!strcasecmp(mode, "sha1"))) {
+ PHP_SHA1Update(ctx, (const unsigned char *) data_ptr, data_len);
+ } else {
+ PHP_MD5Update(ctx, (const unsigned char *) data_ptr, data_len);
+ }
+}
+
+#define http_ob_etaghandler(o, l, ho, hl, m) _http_ob_etaghandler((o), (l), (ho), (hl), (m) TSRMLS_CC)
+extern void _http_ob_etaghandler(char *output, uint output_len, char **handled_output, uint *handled_output_len, int mode TSRMLS_DC);