restore charsetdetect.h

.gitignore

@@ -37,5 +37,4 @@ src/cchardet/*.c
 src/cchardet/*.o
 src/cchardet/*.cpp
 libcharsetdetect.dll
-charsetdetect.h
 MANIFEST

ext/libcharsetdetect/charsetdetect.h

@@ -0,0 +1,30 @@
+#ifndef charsetdetect_
+#define charsetdetect_
+
+/* The classes below are exported */
+#pragma GCC visibility push(default)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Opaque type of character set detectors
+typedef void* csd_t;
+    
+// Create a new character set detector. Must be freed by csd_close.
+// If creation fails, returns (csd_t)-1.
+csd_t csd_open(void);
+// Feeds some more data to the character set detector. Returns 0 if it
+// needs more data to come to a conclusion and a positive number if it has enough to say what
+// the character set is. Returns a negative number if there is an error.
+int csd_consider(csd_t csd, const char *data, int length);
+// Closes the character set detector and returns the detected character set name as an ASCII string.
+// Returns NULL if detection failed.
+const char *csd_close(csd_t csd);
+    
+#ifdef __cplusplus
+}
+#endif
+
+#pragma GCC visibility pop
+#endif