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Author SHA1 Message Date
Rifat Azad
5283178483 ported to golang 2024-09-17 04:55:06 +06:00
4 changed files with 307 additions and 504 deletions

201
LICENSE
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Apache License
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# Define compiler and flags
CC = gcc
# Variables
BINARY_NAME = pacextractor
SRC_FILES = pacextractor.go
# Target executable
TARGET = pacextractor
# Default target
all: build
# Source files
SRC = pacextractor.c
# Build the binary
build:
go build -o $(BINARY_NAME) $(SRC_FILES)
# Rule to build the target
$(TARGET): $(SRC)
$(CC) $(SRC) -o $(TARGET)
# Format the code
fmt:
go fmt $(SRC_FILES)
# Clean up build artifacts
# Run go vet for static analysis
vet:
go vet $(SRC_FILES)
# Run the program with default arguments (modify as needed)
run: build
./$(BINARY_NAME) firmware.pac output_directory
# Clean the build
clean:
rm -f $(TARGET)
rm -f $(BINARY_NAME)
# Help message
help:
@echo "Makefile for building and managing the Go project"
@echo ""
@echo "Usage:"
@echo " make - Build the project"
@echo " make build - Build the binary"
@echo " make fmt - Format the source files"
@echo " make vet - Run go vet for static analysis"
@echo " make run - Run the program with default arguments"
@echo " make clean - Remove the binary"
@echo " make help - Show this help message"
.PHONY: all build fmt vet run clean help

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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdint.h>
#include <sys/stat.h>
#define VERSION "1.1.0"
typedef struct {
int16_t someField[24];
int32_t someInt;
int16_t productName[256];
int16_t firmwareName[256];
int32_t partitionCount;
int32_t partitionsListStart;
int32_t someIntFields1[5];
int16_t productName2[50];
int16_t someIntFields2[6];
int16_t someIntFields3[2];
} PacHeader;
typedef struct {
uint32_t length;
int16_t partitionName[256];
int16_t fileName[512];
uint32_t partitionSize;
int32_t someFields1[2];
uint32_t partitionAddrInPac;
int32_t someFields2[3];
int32_t dataArray[];
} PartitionHeader;
static void getString(const int16_t* baseString, char* resString) {
if (baseString == NULL || resString == NULL) {
*resString = '\0';
return;
}
while (*baseString) {
*resString++ = (char)(*baseString & 0xFF);
baseString++;
if (resString - resString > 255) { // Prevent buffer overflow
break;
}
}
*resString = '\0'; // Null-terminate the result string
}
static void printUsage(void) {
printf("Usage: pacextractor -e <firmware name>.pac -o <output path>\n");
printf("Options:\n");
printf(" -h Show this help message and exit\n");
printf(" -v Show version information and exit\n");
}
static void printUsageAndExit(void) {
printUsage();
exit(EXIT_FAILURE);
}
static void handleOpenFileError(const char* fileName) {
perror(fileName);
exit(EXIT_FAILURE);
}
static int openFirmwareFile(const char* filePath) {
int fd = open(filePath, O_RDONLY);
if (fd == -1) {
handleOpenFileError(filePath);
}
return fd;
}
static void createOutputDirectory(const char* path) {
char temp[768];
strcpy(temp, path);
for (char *p = temp; *p; p++) {
if (*p == '/') {
*p = 0; // Temporarily terminate the string
if (access(temp, F_OK) == -1) {
if (mkdir(temp, 0777) == -1) {
perror("Failed to create output directory");
exit(EXIT_FAILURE);
}
}
*p = '/'; // Restore the string
}
}
if (access(temp, F_OK) == -1) {
if (mkdir(temp, 0777) == -1) {
perror("Failed to create output directory");
exit(EXIT_FAILURE);
}
}
}
static PacHeader readPacHeader(int fd) {
PacHeader header;
if (read(fd, &header, sizeof(PacHeader)) != sizeof(PacHeader)) {
perror("Error while reading PAC header");
exit(EXIT_FAILURE);
}
return header;
}
static PartitionHeader* readPartitionHeader(int fd, uint32_t* curPos) {
lseek(fd, *curPos, SEEK_SET);
uint32_t length;
if (read(fd, &length, sizeof(length)) != sizeof(length)) {
perror("Error while reading partition header length");
exit(EXIT_FAILURE);
}
PartitionHeader* header = malloc(length);
if (header == NULL) {
perror("Memory allocation failed");
exit(EXIT_FAILURE);
}
lseek(fd, *curPos, SEEK_SET);
if (read(fd, header, length) != length) {
perror("Error while reading partition header");
free(header);
exit(EXIT_FAILURE);
}
*curPos += length;
return header;
}
static void printProgressBar(uint32_t completed, uint32_t total) {
const int barWidth = 50;
float progress = (float)completed / total;
int pos = barWidth * progress;
// Determine color based on progress
const char* color;
if (progress < 0.5) {
color = "\033[31m"; // Red
} else if (progress < 0.8) {
color = "\033[33m"; // Yellow
} else {
color = "\033[32m"; // Green
}
const char* reset = "\033[0m"; // Reset color
printf("\r[%s", color);
for (int i = 0; i < barWidth; ++i) {
if (i < pos) printf("=");
else if (i == pos) printf(">");
else printf(" ");
}
printf("]%s %.2f%%", reset, progress * 100.0);
fflush(stdout);
}
static void extractPartition(int fd, const PartitionHeader* partHeader, const char* outputPath) {
if (partHeader->partitionSize == 0) {
return;
}
lseek(fd, partHeader->partitionAddrInPac, SEEK_SET);
// Increase buffer size for faster I/O operations
const size_t BUFFER_SIZE = 256 * 1024; // 256 KB
char* buffer = malloc(BUFFER_SIZE);
if (buffer == NULL) {
perror("Memory allocation failed");
exit(EXIT_FAILURE);
}
char outputFilePath[768];
char fileName[512];
getString(partHeader->fileName, fileName);
snprintf(outputFilePath, sizeof(outputFilePath), "%s/%s", outputPath, fileName);
if (remove(outputFilePath) == -1 && errno != ENOENT) {
perror("Error removing existing output file");
free(buffer);
exit(EXIT_FAILURE);
}
int fd_new = open(outputFilePath, O_WRONLY | O_CREAT | O_TRUNC, 0666);
if (fd_new == -1) {
perror("Error creating output file");
free(buffer);
exit(EXIT_FAILURE);
}
printf("Extracting to %s\n", outputFilePath);
uint32_t dataSizeLeft = partHeader->partitionSize;
uint32_t dataSizeRead = 0;
while (dataSizeLeft > 0) {
uint32_t copyLength = (dataSizeLeft > BUFFER_SIZE) ? BUFFER_SIZE : dataSizeLeft;
ssize_t rb = read(fd, buffer, copyLength);
if (rb != copyLength) {
perror("Error while reading partition data");
close(fd_new);
free(buffer);
exit(EXIT_FAILURE);
}
ssize_t wb = write(fd_new, buffer, copyLength);
if (wb != copyLength) {
perror("Error while writing partition data");
close(fd_new);
free(buffer);
exit(EXIT_FAILURE);
}
dataSizeLeft -= copyLength;
dataSizeRead += copyLength;
printProgressBar(dataSizeRead, partHeader->partitionSize);
}
printf("\n");
close(fd_new);
free(buffer);
}
int main(int argc, char** argv) {
if (argc < 5) {
printUsageAndExit();
}
if (strcmp(argv[1], "-h") == 0) {
printUsage();
exit(EXIT_SUCCESS);
} else if (strcmp(argv[1], "-v") == 0) {
printf("pacextractor version %s\n", VERSION);
exit(EXIT_SUCCESS);
} else if (strcmp(argv[1], "-e") == 0 && strcmp(argv[3], "-o") == 0) {
// Process the extraction
int fd = openFirmwareFile(argv[2]);
struct stat st;
if (fstat(fd, &st) == -1) {
perror("Error getting file stats");
exit(EXIT_FAILURE);
}
int firmwareSize = st.st_size;
if (firmwareSize < sizeof(PacHeader)) {
fprintf(stderr, "File %s is not a valid firmware\n", argv[2]);
close(fd);
exit(EXIT_FAILURE);
}
char* outputPath = argv[4];
createOutputDirectory(outputPath);
PacHeader pacHeader = readPacHeader(fd);
char firmwareName[256];
getString(pacHeader.firmwareName, firmwareName);
printf("Firmware name: %s\n", firmwareName);
uint32_t curPos = pacHeader.partitionsListStart;
PartitionHeader** partHeaders = malloc(pacHeader.partitionCount * sizeof(PartitionHeader*));
if (partHeaders == NULL) {
perror("Memory allocation failed for partition headers");
close(fd);
exit(EXIT_FAILURE);
}
for (int i = 0; i < pacHeader.partitionCount; i++) {
partHeaders[i] = readPartitionHeader(fd, &curPos);
char partitionName[256];
char fileName[512];
getString(partHeaders[i]->partitionName, partitionName);
getString(partHeaders[i]->fileName, fileName);
printf("Partition name: %s\n\twith file name: %s\n\twith size %u\n",
partitionName, fileName, partHeaders[i]->partitionSize);
}
for (int i = 0; i < pacHeader.partitionCount; i++) {
extractPartition(fd, partHeaders[i], outputPath);
free(partHeaders[i]);
}
free(partHeaders);
close(fd);
return EXIT_SUCCESS;
} else {
printUsageAndExit();
}
return EXIT_SUCCESS;
}

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pacextractor.go Normal file
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package main
import (
"encoding/binary"
"flag"
"fmt"
"io"
"os"
"path/filepath"
)
// Version of the extractor
const Version = "1.0.0"
// PacHeader is the structure for the PAC file header
type PacHeader struct {
SomeField [24]int16
SomeInt int32
ProductName [256]int16
FirmwareName [256]int16
PartitionCount int32
PartitionsListStart int32
SomeIntFields1 [5]int32
ProductName2 [50]int16
SomeIntFields2 [6]int16
SomeIntFields3 [2]int16
}
// PartitionHeader is the structure for each partition in the PAC file
type PartitionHeader struct {
Length uint32
PartitionName [256]int16
FileName [512]int16
PartitionSize uint32
SomeFields1 [2]int32
PartitionAddrInPac uint32
SomeFields2 [3]int32
}
// getString converts an int16 array to a UTF-8 string
func getString(baseString []int16) string {
var resString string
for _, ch := range baseString {
if ch == 0 {
break
}
resString += string(rune(ch))
}
return resString
}
// printUsage prints the usage information
func printUsage() {
fmt.Println("Usage: pacextractor <firmware name>.pac <output path>")
fmt.Println("Options:")
fmt.Println(" -h Show this help message and exit")
fmt.Println(" -v Show version information and exit")
}
// openFirmwareFile opens the firmware file
func openFirmwareFile(filePath string) (*os.File, error) {
fd, err := os.Open(filePath)
if err != nil {
return nil, fmt.Errorf("Error opening file %s: %w", filePath, err)
}
return fd, nil
}
// createOutputDirectory creates the output directory if it doesn't exist
func createOutputDirectory(path string) error {
if _, err := os.Stat(path); os.IsNotExist(err) {
err = os.MkdirAll(path, 0777)
if err != nil {
return fmt.Errorf("Failed to create output directory: %w", err)
}
fmt.Printf("Created output directory: %s\n", path)
}
return nil
}
// readPacHeader reads the PAC file header
func readPacHeader(fd *os.File) (PacHeader, error) {
var header PacHeader
err := binary.Read(fd, binary.LittleEndian, &header)
if err != nil {
return header, fmt.Errorf("Error while reading PAC header: %w", err)
}
return header, nil
}
// readPartitionHeader reads the partition header at the current file offset
func readPartitionHeader(fd *os.File) (PartitionHeader, error) {
var header PartitionHeader
err := binary.Read(fd, binary.LittleEndian, &header)
if err != nil {
return header, fmt.Errorf("Error while reading partition header: %w", err)
}
return header, nil
}
// printProgressBar prints a progress bar
func printProgressBar(completed, total uint32) {
const barWidth = 50
progress := float64(completed) / float64(total)
pos := int(barWidth * progress)
fmt.Print("\r[")
for i := 0; i < barWidth; i++ {
if i < pos {
fmt.Print("=")
} else if i == pos {
fmt.Print(">")
} else {
fmt.Print(" ")
}
}
fmt.Printf("] %.2f%%", progress*100)
}
// extractPartition extracts a partition to a file
func extractPartition(fd *os.File, partHeader PartitionHeader, outputPath string) error {
if partHeader.PartitionSize == 0 {
return nil
}
_, err := fd.Seek(int64(partHeader.PartitionAddrInPac), io.SeekStart)
if err != nil {
return fmt.Errorf("Error seeking partition data: %w", err)
}
// Increase buffer size for faster I/O operations
const bufferSize = 256 * 1024 // 256 KB
buffer := make([]byte, bufferSize)
fileName := getString(partHeader.FileName[:])
outputFilePath := filepath.Join(outputPath, fileName)
// Remove existing file if it exists
err = os.Remove(outputFilePath)
if err != nil && !os.IsNotExist(err) {
return fmt.Errorf("Error removing existing output file: %w", err)
}
fdNew, err := os.OpenFile(outputFilePath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0666)
if err != nil {
return fmt.Errorf("Error creating output file: %w", err)
}
defer fdNew.Close()
fmt.Printf("Extracting to %s\n", outputFilePath)
dataSizeLeft := partHeader.PartitionSize
var dataSizeRead uint32
for dataSizeLeft > 0 {
copyLength := bufferSize
if int(dataSizeLeft) < bufferSize {
copyLength = int(dataSizeLeft)
}
n, err := io.ReadFull(fd, buffer[:copyLength])
if err != nil {
return fmt.Errorf("Error while reading partition data: %w", err)
}
_, err = fdNew.Write(buffer[:n])
if err != nil {
return fmt.Errorf("Error while writing partition data: %w", err)
}
dataSizeLeft -= uint32(n)
dataSizeRead += uint32(n)
printProgressBar(dataSizeRead, partHeader.PartitionSize)
}
fmt.Println()
return nil
}
func main() {
flag.Usage = printUsage
flagVersion := flag.Bool("v", false, "Show version information and exit")
flagHelp := flag.Bool("h", false, "Show help message and exit")
flag.Parse()
if *flagHelp {
printUsage()
os.Exit(0)
}
if *flagVersion {
fmt.Printf("pacextractor version %s\n", Version)
os.Exit(0)
}
args := flag.Args()
if len(args) < 2 {
printUsage()
os.Exit(1)
}
firmwarePath := args[0]
outputPath := args[1]
fd, err := openFirmwareFile(firmwarePath)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
defer fd.Close()
fileInfo, err := fd.Stat()
if err != nil {
fmt.Printf("Error getting file stats: %v\n", err)
os.Exit(1)
}
firmwareSize := fileInfo.Size()
if firmwareSize < int64(binary.Size(PacHeader{})) {
fmt.Printf("file %s is not a valid firmware\n", firmwarePath)
os.Exit(1)
}
err = createOutputDirectory(outputPath)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
pacHeader, err := readPacHeader(fd)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
firmwareName := getString(pacHeader.FirmwareName[:])
fmt.Printf("Firmware name: %s\n", firmwareName)
curPos := int64(pacHeader.PartitionsListStart)
partHeaders := make([]PartitionHeader, pacHeader.PartitionCount)
for i := 0; i < int(pacHeader.PartitionCount); i++ {
_, err := fd.Seek(curPos, io.SeekStart)
if err != nil {
fmt.Printf("Error seeking to partition %d: %v\n", i, err)
os.Exit(1)
}
partHeader, err := readPartitionHeader(fd)
if err != nil {
fmt.Printf("Error reading partition %d: %v\n", i, err)
os.Exit(1)
}
partHeaders[i] = partHeader
partitionName := getString(partHeader.PartitionName[:])
fileName := getString(partHeader.FileName[:])
fmt.Printf("Partition name: %s\n\twith file name: %s\n\twith size %d\n", partitionName, fileName, partHeader.PartitionSize)
curPos += int64(partHeader.Length)
}
for i := 0; i < int(pacHeader.PartitionCount); i++ {
err = extractPartition(fd, partHeaders[i], outputPath)
if err != nil {
fmt.Printf("Error extracting partition %d: %v\n", i, err)
os.Exit(1)
}
}
}