Half implemented decompression. Need to figure out how to handle group size adjustment on decompressed data.

espReader/ESPReader.h

@@ -277,6 +277,12 @@ extern "C" {
 	 */
 	size_t espr_formid_count(char *data, size_t size);
 
+	/* Copies the data from `data` to `buf` decompressing compressed fields as
+	 * it does so. buf_size should be the value returned from `espr_decompressed_size`,
+	 * and `buf` should be at least of that size.
+	 */
+	void espr_decompress(char *data, size_t size, char *buf, size_t buf_size);
+
 // End C++ guard
 #ifdef __cplusplus
 }