Merge pull request RfidResearchGroup#2502 from evildaemond/master

Simple Trace Parsing LUA Library

client/lualibs/trace_parse.lua

@@ -0,0 +1,98 @@
+--[[ 
+    Simple Trace Parser library 
+
+    -- fair warning, this is best to just get trace data values, I didn't see any better implementation for this, so I just made one myself
+
+    -- Example Usage
+    -- Load the traceParser library
+    local traceParser = require("trace_parse")
+
+    -- Parse the trace file
+    local trace_data = traceParser.parse_trace_file(filename)
+
+    -- Print the parsed data
+    for _, record in ipairs(trace_data) do
+        -- Format the data bytes
+        local data_bytes = {}
+        for i = 1, #record.data do
+            table.insert(data_bytes, string.format("%02X", record.data:byte(i)))
+        end
+        local data_str = table.concat(data_bytes, "")
+        print("Data: " .. data_str)
+    end
+
+ ]]
+
+local bit = require("bit")  -- Requires Lua bitwise library (bit)
+local traceParser = {}
+
+-- Function to read a 4-byte unsigned integer (little-endian)
+local function read_u32_le(data, pos)
+    if pos + 3 > #data then return nil, pos end
+    local b1, b2, b3, b4 = data:byte(pos, pos + 3)
+    return (b4 * 2^24) + (b3 * 2^16) + (b2 * 2^8) + b1, pos + 4
+end
+
+-- Function to read a 2-byte unsigned integer (little-endian)
+local function read_u16_le(data, pos)
+    if pos + 1 > #data then return nil, pos end
+    local b1, b2 = data:byte(pos, pos + 1)
+    return (b2 * 2^8) + b1, pos + 2
+end
+
+-- Function to parse a single record from the trace file
+local function parse_record(trace, pos)
+    local record = {}
+
+    -- Read the 32-bit timestamp (4 bytes, little-endian)
+    record.timestamp_start, pos = read_u32_le(trace, pos)
+
+    -- Read the 16-bit duration (2 bytes, little-endian)
+    record.duration, pos = read_u16_le(trace, pos)
+
+    -- Read the 15-bit data length and 1-bit isResponse flag
+    local data_len_and_flag, pos = read_u16_le(trace, pos)
+    record.data_len = bit.band(data_len_and_flag, 0x7FFF)  -- 15 bits for data length
+    record.is_response = bit.rshift(data_len_and_flag, 15) == 1  -- 1 bit for isResponse
+
+    -- Read the data bytes
+    record.data, pos = trace:sub(pos, pos + record.data_len - 1), pos + record.data_len
+
+    -- Read the parity bytes (parity length is ceil(data_len / 8))
+    local parity_len = math.ceil(record.data_len / 8)
+    record.parity, pos = trace:sub(pos, pos + parity_len - 1), pos + parity_len
+
+    return record, pos
+end
+
+-- Function to parse the entire trace file
+function traceParser.parse_trace_file(file_path)
+    local trace_data = {}
+    local trace_file = io.open(file_path, "rb")
+
+    if not trace_file then
+        error("Could not open file: " .. file_path)
+    end
+
+    -- Read the entire content of the file
+    local content = trace_file:read("*all")
+    trace_file:close()
+
+    -- Parse records in the file
+    local pos = 1
+    while pos <= #content do
+        local record
+        record, pos = parse_record(content, pos)
+        if record then
+            table.insert(trace_data, record)
+        else
+            break  -- Stop if the record is invalid or incomplete
+        end
+    end
+
+    return trace_data
+end
+
+
+return traceParser
+