uEmu: fixes and improvements

- add `Dump To File` option to popup menu in mapped memory view
- fix typos in readme

README.md

@@ -46,7 +46,7 @@ Supports following architectures out of the box: **x86**, **x64**, **ARM**, **AR
 
 ### Start
 
-When emulation is started, it is necessary to provide initial CPU context (see _Update CPU Context_)
+Start emulation from cursor. It is necessary to provide initial CPU context first (see _Update CPU Context_)
 After that all segments from IDA database will be mapped to emulator (initialized data will be copied as well).
 
 ### Run
@@ -124,8 +124,8 @@ Every time emulation stops, changed memory blocks will be highlighted.
 
 ### Update CPU Context
 
-Register Values can be changes individually or all at once with JSON file via popup menu.
-Current context can also be saved in JSON fine for future use.
+Register Values can be changed individually or all at once with JSON file via popup menu.
+Current context can also be saved in JSON file for future use.
 
 ![](./Resources/screenshots/doc_changectx.png)
 
@@ -139,7 +139,7 @@ Apart from all the functions listed in Popup Menu, there are couple of new comma
 
 #### Show Mapped Memory
 
-Display all mapped regions. Use popup menu to display memory for particular region.
+Display all mapped regions. Use popup menu to display memory for particular region or dump it to a file.
 
 ![](./Resources/screenshots/doc_mappedmem.png)
 

uEmu.py

@@ -434,12 +434,23 @@ def __init__(self, owner, memory, flags=0, width=None, height=None, embedded=Fal
         self.items = memory
         self.icon = -1
         self.selcount = 0
-        self.popup_names = [ "", "", "Show", "" ]
+        self.popup_names = [ "", "Dump To File", "Show", "" ]
         self.owner = owner
 
     def OnClose(self):
         pass
 
+    def OnDeleteLine(self, n): # Save JSON
+        filePath = AskFile(1, "*.bin", "Dump memory")
+        if filePath is not None:
+            with open(filePath, 'w') as outfile:
+                address = self.items[n][0]
+                size = self.items[n][1] - self.items[n][0] + 1
+                outfile.seek(0, 0)
+                outfile.write(self.owner.unicornEngine.get_mapped_bytes(address, size))
+                outfile.close()
+        return n
+
     def OnEditLine(self, n):
         address = self.items[n][0]
         size = self.items[n][1] - self.items[n][0] + 1
@@ -783,6 +794,9 @@ def fetch_segments(self):
     def get_mapped_memory(self):
         return [ [ memStart, memEnd, memPerm ] for (memStart, memEnd, memPerm) in self.mu.mem_regions() ]
 
+    def get_mapped_bytes(self, address, size):
+        return self.mu.mem_read(address, size)
+
     def hook_mem_access(self, uc, access, address, size, value, user_data):
         if self.is_breakpoint_reached(address):
             # vvv Workaround to fix issue when register are still updated even if emu_stop is called