document the api filedata call

doc/api/api_filedata.md

@@ -0,0 +1,66 @@
+API filedata
+=============
+
+Provides the ability to download a file from cloud storage in chunks
+
+GET /api/z/1.0/filedata
+
+
+Required:
+
+	- file_id
+		attach.hash of desired file ('begins with' match)
+
+
+Optional:
+
+	- start
+		starting byte of returned data in file (counting from 0)
+
+	- length
+		length (prior to base64 encoding) of chunk to download 
+
+
+Returns:
+
+	attach (DB) structure with base64 encoded 'content' comprised of the desired chunk
+
+
+
+Example:
+
+	https://xyz.macgirvin.com/api/z/1.0/filedata?f=&file_id=9f5217770fd&start=0&length=48
+
+Returns:
+
+	{
+	
+    	"attach": {
+	        "id": "107",
+    	    "aid": "1",
+	        "uid": "2",
+    	    "hash": "9f5217770fd55d563bd77f84d534d8e119a187514bbd391714626cd9c0e60207",
+	        "creator": "pgcJx1IQjuPkx8aI9qheJlBMZzJz-oTPjHy3h5pWlOVOriBO_cSiUhhqwhuZ74TYJ8_ECO3pPiRMWC0q8YPCQg",
+    	    "filename": "pcxtopbm.c",
+	        "filetype": "application/octet-stream",
+    	    "filesize": "3934",
+	        "revision": "0",
+    	    "folder": "",
+	        "flags": "0",
+    	    "is_dir": "0",
+	        "is_photo": "0",
+    	    "os_storage": "1",
+	        "os_path": "",
+    	    "display_path": "",
+	        "content": "LyogcGN4dG9wYm0uYyAtIGNvbnZlcnQgUEMgcGFpbnRicnVzaCAoLnBjeCkgZmls",
+    	    "created": "2016-07-24 23:13:01",
+	        "edited": "2016-07-24 23:13:01",
+    	    "allow_cid": "",
+	        "allow_gid": "",
+    	    "deny_cid": "",
+	        "deny_gid": "",
+    	    "start": 0,
+	        "length": 48
+    	}
+	
+	}

doc/api_zot.md

@@ -27,9 +27,9 @@ api/z/1.0/filemeta
 	Export file metadata for any uploaded file
 
 
-api/z/1.0/filedata
+[api/z/1.0/filedata](help/api/api_filedata)
 
-	Export file contents for any uploaded file
+	Fetch file contents or partial contents for any uploaded file 
 
 
 api/z/1.0/file/export

include/api_zot.php

@@ -157,9 +157,9 @@
 		$start = (($_REQUEST['start']) ? intval($_REQUEST['start']) : 0);
 		$length = (($_REQUEST['length']) ? intval($_REQUEST['length']) : 0);
 
-		$r = q("select * from attach where uid = %d and hash = '%s' limit 1",
+		$r = q("select * from attach where uid = %d and hash like '%s' limit 1",
 			intval(api_user()),
-			dbesc($_REQUEST['file_id'])
+			dbesc($_REQUEST['file_id'] . '%')
 		);
 		if($r) {
 			$ptr = $r[0];