Rawspeed: CameraMetadata: implement getCamera() with prefix-search.

Needed to look for camera with only maker + model known, but no mode.
Here i'm assuming that for all the camera modes we have
the same <ID> name mangling.

This is only needed to de-mangle camera name. *SIGH*

Refs #11108

RawSpeed/CameraMetaData.cpp

@@ -77,6 +77,18 @@ Camera* CameraMetaData::getCamera(string make, string model, string mode) {
   return cameras[id];
 }
 
+Camera* CameraMetaData::getCamera(string make, string model) {
+  string id = getId(make, model, "");
+
+  // do a prefix match, i.e. the make and model match, but not mode.
+  std::map<string,Camera*>::iterator iter = cameras.lower_bound(id);
+
+  if (iter == cameras.find(id))
+    return NULL;
+
+  return cameras[iter->first];
+}
+
 bool CameraMetaData::hasCamera(string make, string model, string mode) {
   string id = getId(make, model, mode);
   if (cameras.end() == cameras.find(id))

RawSpeed/CameraMetaData.h

@@ -36,7 +36,13 @@ class CameraMetaData
   virtual ~CameraMetaData(void);
   map<string,Camera*> cameras;
   map<uint32,Camera*> chdkCameras;
+
+  // searches for camera with given make + model + mode
   Camera* getCamera(string make, string model, string mode);
+
+  // searches for camera with given make + model, with ANY mode
+  Camera* getCamera(string make, string model);
+
   bool hasCamera(string make, string model, string mode);
   Camera* getChdkCamera(uint32 filesize);
   bool hasChdkCamera(uint32 filesize);