From 77b793910a96f192b782f5ee2c1b10fa3e0385cb Mon Sep 17 00:00:00 2001
From: PhatPhuckDave <david.majdandzic@hotmail.com>
Date: Sat, 31 Aug 2024 15:34:05 +0200
Subject: [PATCH] Fully implement bricker

---
 .gitignore |   1 +
 go.mod     |   2 ++
 go.sum     |   2 ++
 main.go    | 104 ++++++++++++++++++++++++++++++++++++++++++++++-------
 sync       |   1 +
 5 files changed, 98 insertions(+), 12 deletions(-)
 create mode 100644 .gitignore
 create mode 100644 go.sum
 create mode 100644 sync

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c512ac1
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+bricker.exe
diff --git a/go.mod b/go.mod
index 8541ce4..5c9d03f 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,5 @@
 module bricker
 
 go 1.23.0
+
+require golang.org/x/exp v0.0.0-20240823005443-9b4947da3948
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..db5d751
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+golang.org/x/exp v0.0.0-20240823005443-9b4947da3948 h1:kx6Ds3MlpiUHKj7syVnbp57++8WpuKPcR5yjLBjvLEA=
+golang.org/x/exp v0.0.0-20240823005443-9b4947da3948/go.mod h1:akd2r19cwCdwSwWeIdzYQGa/EZZyqcOdwWiwj5L5eKQ=
diff --git a/main.go b/main.go
index 47251bb..ce26d22 100644
--- a/main.go
+++ b/main.go
@@ -1,34 +1,114 @@
 package main
 
 import (
+	"flag"
 	"fmt"
 	"io"
 	"log"
 	"os"
+	"sync"
+	"time"
+
+	"golang.org/x/exp/rand"
 )
 
 var Error *log.Logger
 var Warning *log.Logger
+
 func init() {
 	log.SetFlags(log.Lmicroseconds | log.Lshortfile)
-	logFile, err := os.Create("main.log")
-	if err != nil {
-		log.Printf("Error creating log file: %v", err)
-		os.Exit(1)
-	}
-	logger := io.MultiWriter(os.Stdout, logFile)
+	logger := io.MultiWriter(os.Stdout)
 	log.SetOutput(logger)
 
-	Error = log.New(io.MultiWriter(logFile, os.Stderr, os.Stdout),
+	Error = log.New(io.MultiWriter(os.Stderr, os.Stdout),
 		fmt.Sprintf("%sERROR:%s ", "\033[0;101m", "\033[0m"),
 		log.Lmicroseconds|log.Lshortfile)
-	Warning = log.New(io.MultiWriter(logFile, os.Stdout),
+	Warning = log.New(io.MultiWriter(os.Stdout),
 		fmt.Sprintf("%sWarning:%s ", "\033[0;93m", "\033[0m"),
 		log.Lmicroseconds|log.Lshortfile)
 }
 
 func main() {
-	log.Println("Hello, World!")
-	Warning.Println("Hello, World!")
-	Error.Println("Hello, World!")
-}
\ No newline at end of file
+	percent := flag.Int("p", 20, "Percent to mangle")
+	w := flag.Int("w", 8, "Workers")
+	flag.Parse()
+
+	workers := make(chan struct{}, *w)
+	wg := sync.WaitGroup{}
+
+	log.Printf("Corrupting %d%% of each input file", *percent)
+	log.Printf("Using %d workers", *w)
+
+	for _, file := range flag.Args() {
+		wg.Add(1)
+		workers <- struct{}{}
+
+		go func(file string) {
+			defer wg.Done()
+			defer func() { <-workers }()
+
+			log.Printf("Corrupting %s", file)
+			filehandle, err := os.OpenFile(file, os.O_RDWR, 0644)
+			if err != nil {
+				Error.Printf("Error opening %v: %v", file, err)
+				return
+			}
+			defer filehandle.Close()
+
+			// data, err := io.ReadAll(filehandle)
+			// if err != nil {
+			// 	Error.Printf("Error reading %v: %v", file, err)
+			// 	return
+			// }
+			// log.Printf("Read %d bytes from %s", len(data), file)
+			// filehandle.Seek(0, io.SeekStart)
+
+			info, err := os.Stat(file)
+			if err != nil {
+				Error.Printf("Error getting file info for %v: %v", file, err)
+				return
+			}
+			filesize := info.Size()
+			log.Printf("File size is %d bytes", filesize)
+
+			toCorrupt := int64(float32(filesize) * (float32(*percent) / 100))
+			indicesToCorrupt := selectRandomIndices(filesize, toCorrupt)
+			log.Printf("Corrupting %d bytes in %s", toCorrupt, file)
+			log.Printf("%#v", indicesToCorrupt)
+
+			for _, index := range indicesToCorrupt {
+				rbyte := byte(rand.Intn(256))
+				filehandle.Seek(int64(index), io.SeekStart)
+				filehandle.Write([]byte{rbyte})
+			}
+
+			log.Printf("Corrupted %d bytes in %s", toCorrupt, file)
+
+			// n, err := filehandle.Write(data)
+			// if err != nil {
+			// 	Error.Printf("Error writing %v: %v", file, err)
+			// 	return
+			// }
+			// log.Printf("Wrote %d bytes to %s", n, file)
+		}(file)
+	}
+	wg.Wait()
+}
+
+func selectRandomIndices(size, n int64) []int64 {
+	indices := make([]int64, n)
+	for i := range indices {
+		indices[i] = int64(i)
+	}
+
+	rand.Seed(uint64(time.Now().UnixNano()))
+
+	for i := n; i < size; i++ {
+		r := rand.Int63n(i + 1)
+		if r < n {
+			indices[r] = i
+		}
+	}
+
+	return indices
+}
diff --git a/sync b/sync
new file mode 100644
index 0000000..8d4eaf1
--- /dev/null
+++ b/sync
@@ -0,0 +1 @@
+bricker.exe,"C:\Program Files\Git\usr\bin\bricker.exe"
\ No newline at end of file