Add readme section for extraction logging

plugins/apitracing/Readme.md

@@ -88,4 +88,69 @@ type *LPPROCESS_INFORMATION*.
 For example the parameter *hProcess* is of the type *HANDLE*. Depending on the address width of the process it gets
 resolved
 to either *unsigned int* or *unsigned _int64*. Those are *BackingParameterTypes* so either 8 or 4 byte are read when
-extracting this structure from the heap.
+extracting this structure from the heap.
+
+## Extraction Format
+
+Function call traces are logged in an unindented json format which is illustrated indented below for better visibility.
+The parameter extraction logs are identified by the *key* ```Parameterlist:```.
+Its *value* is a list of all function call parameters, whereby the parameter names form the *keys* of the contained *key:value* pairs.
+Each *value* is either the value of the parameter as integer or string value, or it is a list containing
+the *key:value* pairs of backing parameters if it's a pointer to a struct.
+
+```json
+Parameterlist: [
+                {"FileHandle":[
+                                {"HANDLE":45}]},
+                {"DesiredAccess":1180063},
+                {"ObjectAttributes":[
+                                {"Length":48},
+                                {"RootDirectory":0},
+                                {"ObjectName":"\\Device\\ConDrv\\Server"},
+                                {"Attributes":66},
+                                {"SecurityDescriptor":0},
+                                {"SecurityQualityOfService":0}]},
+              {"IoStatusBlock":958106952720},
+              {"AllocationSize":0},
+              {"FileAttributes":0},
+              {"ShareAccess":7},
+              {"CreateDisposition":2},
+              {"CreateOptions":0},
+              {"EaBuffer":0},
+              {"EaLength":0}]
+```
+
+The log example above is a function call from *NtCreateFile* with these parameters:
+
+```
+__kernel_entry NTSTATUS NtCreateFile(
+  [out]          PHANDLE            FileHandle,
+  [in]           ACCESS_MASK        DesiredAccess,
+  [in]           POBJECT_ATTRIBUTES ObjectAttributes,
+  [out]          PIO_STATUS_BLOCK   IoStatusBlock,
+  [in, optional] PLARGE_INTEGER     AllocationSize,
+  [in]           ULONG              FileAttributes,
+  [in]           ULONG              ShareAccess,
+  [in]           ULONG              CreateDisposition,
+  [in]           ULONG              CreateOptions,
+  [in]           PVOID              EaBuffer,
+  [in]           ULONG              EaLength
+);
+```
+
+*FileHandle, DesiredAccess, ObjectAttributues, IOStatusBlocck,AllocationSize, FileAttributes,ShareAccess, CreateDisposition,
+CreateOptions, EaBuffer* and *EaLength* are members of the list in parameterlist *value*.
+
+```
+typedef struct _OBJECT_ATTRIBUTES {
+  ULONG           Length;
+  HANDLE          RootDirectory;
+  PUNICODE_STRING ObjectName;
+  ULONG           Attributes;
+  PVOID           SecurityDescriptor;
+  PVOID           SecurityQualityOfService;
+} OBJECT_ATTRIBUTES;
+```
+
+*ObjectAttributes* is a pointer to a struct, so its value is a list containing the backing parameters.
+The parameter *ObjectName* is a pointer, but strings are extracted right away to keep the structure more flat.