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rockbox/utils/jz4760_tools/packtools.cpp
Amaury Pouly c90d42dcc6 jz4670_tools: add usbboot tool, tweak Makefile and packtool 
Although the jz4740 contains a similar tool to usbboot, its command-line
interface is not very useful, also it does not compile by default because it
relies on some external code, and it contains code specific to some JZ4740
devices.

Change-Id: I22688238d147e21fb0fd524466b333b6003d4ff1
2016-04-08 18:54:46 +01:00

566 lines
20 KiB
C++
Raw Blame History

/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2015 by Amaury Pouly
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <stdint.h>
#include <fstream>
#include <sys/stat.h>
#include <getopt.h>
#include <sys/types.h>
#include <dirent.h>
#include <unistd.h>
#include <vector>
#include <string>
#include <algorithm>
#include <ctime>
#include <sstream>
struct jz4760_fw_hdr_t
{
uint32_t magic;
uint32_t fs_size; // unsure, always 0x7f00000
uint32_t hdr_size; // header size in sectors, always 4
uint32_t pad;
char datetime[12]; // format: yyyymmddhhmm
uint32_t nr_files;
uint32_t unk; // always 2, seems related to CRC, maybe CRC mode
uint32_t pad2[3];
uint8_t machine[8];
uint8_t pad3[452];
uint32_t eoh; // end of header
} __attribute__((packed));
const uint32_t JZ4760_FW_MAGIC = 0x49484653; // 'IHFS'
const uint32_t JZ4760_FW_EOH = 0x55aa55aa; // end of header
struct jz4760_fw_file_t
{
char name[56];
uint32_t offset; // absolute offset in sectors
uint32_t size; // in bytes
} __attribute__((packed));
const uint32_t jz4760_crc_key[256] =
{
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0,
};
/* This table is generated programmatically: it contains two copies of a 172-bytes
* table. This table contains the lower 8-bit of the first 172 prime numbers:
* 2, 3, 5, 7, ..., 251(=0xfb), 257(=0x101 -> 0x01), ... */
const unsigned JZ4760_XOR_KEY_SIZE = 344;
uint8_t jz4760_xor_key[JZ4760_XOR_KEY_SIZE] =
{
0x02, 0x03, 0x05, 0x07, 0x0b, 0x0d, 0x11, 0x13,
0x17, 0x1d, 0x1f, 0x25, 0x29, 0x2b, 0x2f, 0x35,
0x3b, 0x3d, 0x43, 0x47, 0x49, 0x4f, 0x53, 0x59,
0x61, 0x65, 0x67, 0x6b, 0x6d, 0x71, 0x7f, 0x83,
0x89, 0x8b, 0x95, 0x97, 0x9d, 0xa3, 0xa7, 0xad,
0xb3, 0xb5, 0xbf, 0xc1, 0xc5, 0xc7, 0xd3, 0xdf,
0xe3, 0xe5, 0xe9, 0xef, 0xf1, 0xfb, 0x01, 0x07,
0x0d, 0x0f, 0x15, 0x19, 0x1b, 0x25, 0x33, 0x37,
0x39, 0x3d, 0x4b, 0x51, 0x5b, 0x5d, 0x61, 0x67,
0x6f, 0x75, 0x7b, 0x7f, 0x85, 0x8d, 0x91, 0x99,
0xa3, 0xa5, 0xaf, 0xb1, 0xb7, 0xbb, 0xc1, 0xc9,
0xcd, 0xcf, 0xd3, 0xdf, 0xe7, 0xeb, 0xf3, 0xf7,
0xfd, 0x09, 0x0b, 0x1d, 0x23, 0x2d, 0x33, 0x39,
0x3b, 0x41, 0x4b, 0x51, 0x57, 0x59, 0x5f, 0x65,
0x69, 0x6b, 0x77, 0x81, 0x83, 0x87, 0x8d, 0x93,
0x95, 0xa1, 0xa5, 0xab, 0xb3, 0xbd, 0xc5, 0xcf,
0xd7, 0xdd, 0xe3, 0xe7, 0xef, 0xf5, 0xf9, 0x01,
0x05, 0x13, 0x1d, 0x29, 0x2b, 0x35, 0x37, 0x3b,
0x3d, 0x47, 0x55, 0x59, 0x5b, 0x5f, 0x6d, 0x71,
0x73, 0x77, 0x8b, 0x8f, 0x97, 0xa1, 0xa9, 0xad,
0xb3, 0xb9, 0xc7, 0xcb, 0xd1, 0xd7, 0xdf, 0xe5,
0xf1, 0xf5, 0xfb, 0xfd, 0x02, 0x03, 0x05, 0x07,
0x0b, 0x0d, 0x11, 0x13, 0x17, 0x1d, 0x1f, 0x25,
0x29, 0x2b, 0x2f, 0x35, 0x3b, 0x3d, 0x43, 0x47,
0x49, 0x4f, 0x53, 0x59, 0x61, 0x65, 0x67, 0x6b,
0x6d, 0x71, 0x7f, 0x83, 0x89, 0x8b, 0x95, 0x97,
0x9d, 0xa3, 0xa7, 0xad, 0xb3, 0xb5, 0xbf, 0xc1,
0xc5, 0xc7, 0xd3, 0xdf, 0xe3, 0xe5, 0xe9, 0xef,
0xf1, 0xfb, 0x01, 0x07, 0x0d, 0x0f, 0x15, 0x19,
0x1b, 0x25, 0x33, 0x37, 0x39, 0x3d, 0x4b, 0x51,
0x5b, 0x5d, 0x61, 0x67, 0x6f, 0x75, 0x7b, 0x7f,
0x85, 0x8d, 0x91, 0x99, 0xa3, 0xa5, 0xaf, 0xb1,
0xb7, 0xbb, 0xc1, 0xc9, 0xcd, 0xcf, 0xd3, 0xdf,
0xe7, 0xeb, 0xf3, 0xf7, 0xfd, 0x09, 0x0b, 0x1d,
0x23, 0x2d, 0x33, 0x39, 0x3b, 0x41, 0x4b, 0x51,
0x57, 0x59, 0x5f, 0x65, 0x69, 0x6b, 0x77, 0x81,
0x83, 0x87, 0x8d, 0x93, 0x95, 0xa1, 0xa5, 0xab,
0xb3, 0xbd, 0xc5, 0xcf, 0xd7, 0xdd, 0xe3, 0xe7,
0xef, 0xf5, 0xf9, 0x01, 0x05, 0x13, 0x1d, 0x29,
0x2b, 0x35, 0x37, 0x3b, 0x3d, 0x47, 0x55, 0x59,
0x5b, 0x5f, 0x6d, 0x71, 0x73, 0x77, 0x8b, 0x8f,
0x97, 0xa1, 0xa9, 0xad, 0xb3, 0xb9, 0xc7, 0xcb,
0xd1, 0xd7, 0xdf, 0xe5, 0xf1, 0xf5, 0xfb, 0xfd,
};
bool g_verbose = false;
uint8_t *read_file(const std::string& path, size_t& size)
{
std::ifstream fin(path.c_str(), std::ios::binary);
if(!fin)
{
printf("Error: cannot open '%s'\n", path.c_str());
return 0;
}
fin.seekg(0, std::ios::end);
size = fin.tellg();
fin.seekg(0, std::ios::beg);
uint8_t *buf = new uint8_t[size];
fin.read((char *)buf, size);
return buf;
}
bool write_file(const std::string& path, uint8_t *buf, size_t size)
{
std::ofstream fout(path.c_str(), std::ios::binary);
if(!fout)
{
printf("Error: cannot open '%s'\n", path.c_str());
return false;
}
fout.write((char *)buf, size);
fout.close();
return true;
}
bool create_dir(const std::string& dir)
{
mkdir(dir.c_str(), 0755);
return true;
}
// the firmware uses '\' as separator
bool create_file(std::string path, uint8_t *buf, size_t size)
{
size_t pos = -1;
while((pos = path.find_first_of("/\\", pos + 1)) != std::string::npos)
{
path[pos] = '/';
create_dir(path.substr(0, pos));
}
return write_file(path, buf, size);
}
bool list_files(const std::string& prefix, const std::string& path,
std::vector< std::string >& list)
{
DIR *dir = opendir((prefix + "/" + path).c_str());
if(!dir)
{
printf("Error: cannot open directory '%s'\n", path.c_str());
goto Lerr;
}
struct dirent *entry;
while((entry = readdir(dir)))
{
std::string p = entry->d_name;
if(p == "." || p == "..")
continue;
std::string subname = prefix + "/" + path + "/" + entry->d_name;
struct stat st;
if(lstat(subname.c_str(), &st) != 0)
{
printf("Error: cannot stat '%s'\n", subname.c_str());
goto Lerr;
}
if(!path.empty())
p = path + "/" + p;
if(st.st_mode & S_IFREG)
list.push_back(p);
if(st.st_mode & S_IFDIR)
{
if(!list_files(prefix, p, list))
goto Lerr;
}
}
closedir(dir);
return true;
Lerr:
closedir(dir);
return false;
}
std::vector< std::string > list_files(const std::string& path, bool& ok)
{
std::vector< std::string > list;
ok = list_files(path, "", list);
return list;
}
uint32_t jz4760_crc(uint32_t crc, uint8_t *buf, size_t size)
{
while(size--)
crc = jz4760_crc_key[*buf++ ^ ((crc & 0xff00) >> 8)] ^ (crc << 8);
return crc;
}
int unpack(int argc, char **argv)
{
std::string input_file;
std::string output_dir;
while(1)
{
int c = getopt(argc, argv, "i:o:v");
if(c == -1)
break;
switch(c)
{
case 'v':
g_verbose = true;
break;
case 'i':
input_file = optarg;
break;
case 'o':
output_dir = optarg;
break;
default:
abort();
}
}
if(optind != argc)
return printf("Error: extra arguments on command line\n");
if(input_file.empty())
return printf("Error: you need to specify the input file\n");
if(output_dir.empty())
printf("Warning: you did not specify an output directory, this will be a dry run\n");
size_t fw_size;
uint8_t *fw_buf = read_file(input_file, fw_size);
if(!fw_buf)
return 1;
/* firmware has N blocks of 512 plus a 4 byte checksum at the end
* each file must have at least 4 sectors for the header and 256 for the entries
* for a total of 260 */
if(fw_size < 512 * 260)
return printf("Error: firmware is too small\n");
if((fw_size - 4) % 512)
return printf("Error: firmware has bad size\n");
struct jz4760_fw_hdr_t *fw_hdr = (struct jz4760_fw_hdr_t *)fw_buf;
if(fw_hdr->magic != JZ4760_FW_MAGIC)
return printf("Error: firmware has wrong magic value\n");
if(fw_hdr->eoh != JZ4760_FW_EOH)
return printf("Error: firmware has wrong end of header value\n");
if(g_verbose)
{
printf("Header:\n");
printf(" Magic: %#x\n", fw_hdr->magic);
printf(" FS Size: %#x\n", fw_hdr->fs_size);
printf(" Header Size: %d\n", fw_hdr->hdr_size);
printf(" Date: %c%c/%c%c/%c%c%c%c\n", fw_hdr->datetime[6],
fw_hdr->datetime[7], fw_hdr->datetime[4], fw_hdr->datetime[5],
fw_hdr->datetime[0], fw_hdr->datetime[1], fw_hdr->datetime[2],
fw_hdr->datetime[3]);
printf(" Time: %c%c:%c%c\n", fw_hdr->datetime[8],
fw_hdr->datetime[9], fw_hdr->datetime[10], fw_hdr->datetime[11]);
printf(" Files: %u\n", fw_hdr->nr_files);
printf(" Unknown: %x\n", fw_hdr->unk);
printf(" Machine: %.8s\n", fw_hdr->machine);
}
uint32_t crc = *reinterpret_cast< uint32_t* >(fw_buf + fw_size - 4);
if(crc != jz4760_crc(0, fw_buf, fw_size - 4))
return printf("Error: CRC does not match\n");
// check number of files
if(fw_hdr->nr_files > 2048)
return printf("Error: too many files\n");
struct jz4760_fw_file_t *fw_file = (struct jz4760_fw_file_t *)(fw_buf + 4 * 512);
for(unsigned i = 0; i < fw_hdr->nr_files; i++)
{
if(g_verbose)
{
printf("File #%d:\n", i);
printf(" Name: %s\n", fw_file[i].name);
printf(" Offset: %#x\n", fw_file[i].offset);
printf(" Size: %u\n", fw_file[i].size);
}
if(output_dir.empty())
continue;
create_file(output_dir + "/" + std::string(fw_file[i].name, sizeof(fw_file[i].name)),
fw_buf + 512 * fw_file[i].offset, fw_file[i].size);
}
return 0;
}
bool parse_time(const std::string& time, std::tm& tm)
{
std::istringstream iss(time);
iss >> tm.tm_mday;
if(iss.get() != '/')
goto Lwarn;
iss >> tm.tm_mon;
if(iss.get() != '/')
goto Lwarn;
iss >> tm.tm_year;
iss >> tm.tm_hour;
if(iss.get() != ':')
goto Lwarn;
iss >> tm.tm_min;
return true;
Lwarn:
printf("Error: wrong time format\n");
return false;
}
bool istrcmp(const std::string& a, const std::string& b)
{
return strcasecmp(a.c_str(), b.c_str()) < 0;
}
int pack(int argc, char **argv)
{
std::string input_dir;
std::string output_file;
std::string machine;
std::string datetime;
while(1)
{
int c = getopt(argc, argv, "i:o:m:vt:");
if(c == -1)
break;
switch(c)
{
case 'v':
g_verbose = true;
break;
case 'i':
input_dir = optarg;
break;
case 'o':
output_file = optarg;
break;
case 'm':
machine = optarg;
break;
case 't':
datetime = optarg;
break;
default:
abort();
}
}
if(optind != argc)
return printf("Error: extra arguments on command line\n");
if(input_dir.empty())
return printf("Error: you need to specify the input file\n");
if(machine.empty())
printf("Warning: you did not specify the machine flags, the produce file may be invalid\n");
if(output_file.empty())
return printf("Error: you must specify an output file\n");
bool ok = true;
std::vector< std::string > list = list_files(input_dir, ok);
if(!ok)
return printf("Error: there were some errors while listing files\n");
/* NOTE: keep compatibility with original packtools which sorts files,
* I doubt the sorted order is really necessary but not costly anyway */
std::sort(list.begin(), list.end(), istrcmp);
if(g_verbose)
{
for(size_t i = 0; i < list.size(); i++)
printf("%s\n", list[i].c_str());
}
if(list.size() > 2048)
return printf("Error: cannot make an archive with more than 2048 files\n");
struct jz4760_fw_hdr_t hdr;
memset(&hdr, 0, sizeof(hdr));
hdr.magic = JZ4760_FW_MAGIC;
hdr.fs_size = 0x7f00000;
hdr.hdr_size = 4;
std::time_t time = std::time(0);
std::tm *tm = localtime(&time);
if(!datetime.empty())
if(!parse_time(datetime, *tm))
return 1;
char str[13];
snprintf(str, sizeof(str), "%04d%02d%02d%02d%02d", tm->tm_year, tm->tm_mon,
tm->tm_mday, tm->tm_hour, tm->tm_min);
memcpy(hdr.datetime, str, sizeof(hdr.datetime));
hdr.unk = 2;
hdr.nr_files = list.size();
memcpy(hdr.machine, machine.c_str(), sizeof(hdr.machine));
hdr.eoh = JZ4760_FW_EOH;
uint32_t crc = jz4760_crc(0, (uint8_t *)&hdr, sizeof(hdr));
std::ofstream fout(output_file.c_str(), std::ios::binary);
fout.write((char *)&hdr, sizeof(hdr));
// three empty sectors
uint8_t zero_sector[512];
memset(zero_sector, 0, sizeof(zero_sector));
crc = jz4760_crc(crc, zero_sector, sizeof(zero_sector));
fout.write((char *)zero_sector, sizeof(zero_sector));
crc = jz4760_crc(crc, zero_sector, sizeof(zero_sector));
fout.write((char *)zero_sector, sizeof(zero_sector));
crc = jz4760_crc(crc, zero_sector, sizeof(zero_sector));
fout.write((char *)zero_sector, sizeof(zero_sector));
// write file headers
size_t tot_size = 260; // 4 for headers, 256 for file headers
for(size_t i = 0; i < list.size(); i++)
{
jz4760_fw_file_t file;
memset(&file, 0, sizeof(file));
std::string name = list[i];
for(size_t j = 0; j < name.size(); j++)
if(name[j] == '/')
name[j] = '\\';
if(name.size() > sizeof(file.name))
return printf("Error: filename '%s' is too long\n", name.c_str());
memcpy(file.name, name.c_str(), name.size());
struct stat st;
if(lstat((input_dir + "/" + list[i]).c_str(), &st))
return printf("Error: cannot stat file '%s'\n", list[i].c_str());
file.size = st.st_size;
file.offset = tot_size;
tot_size += (file.size + 511) / 512;
crc = jz4760_crc(crc, (uint8_t *)&file, sizeof(file));
fout.write((char *)&file, sizeof(file));
}
// finish writing the 256 sectors
for(size_t i = list.size(); i < 2048; i++)
{
crc = jz4760_crc(crc, zero_sector, sizeof(jz4760_fw_file_t));
fout.write((char *)zero_sector, sizeof(jz4760_fw_file_t));
}
// write the files
for(size_t i = 0; i < list.size(); i++)
{
size_t sz;
uint8_t *data = read_file(input_dir + "/" + list[i], sz);
if(!data)
return printf("Error: cannot read file '%s'\n", list[i].c_str());
crc = jz4760_crc(crc, data, sz);
fout.write((char *)data, sz);
delete data;
if(sz % 512)
{
crc = jz4760_crc(crc, zero_sector, 512 - (sz % 512));
fout.write((char *)zero_sector, 512 - (sz % 512));
}
}
// write the crc
fout.write((char *)&crc, sizeof(crc));
fout.close();
return 0;
}
int descramble(int argc, char **argv)
{
std::string input_file;
std::string output_file;
while(1)
{
int c = getopt(argc, argv, "i:o:");
if(c == -1)
break;
switch(c)
{
case 'i':
input_file = optarg;
break;
case 'o':
output_file = optarg;
break;
default:
abort();
}
}
if(optind != argc)
return printf("Error: extra arguments on command line\n");
if(input_file.empty() || output_file.empty())
return printf("Error: you need to specify the input and output files\n");
size_t fw_size;
uint8_t *fw_buf = read_file(input_file, fw_size);
if(!fw_buf)
return 1;
for(size_t i = 0; i < fw_size; i++)
fw_buf[i] ^= jz4760_xor_key[i % JZ4760_XOR_KEY_SIZE];
if(!write_file(output_file, fw_buf, fw_size))
return 1;
return 0;
}
void usage()
{
printf("usage: [--pack|--unpack|--descramble|--scramble] <options>\n");
printf(" unpack options:\n");
printf(" -i <file> Input file\n");
printf(" -o <dir> Output directory\n");
printf(" -v Verbose output\n");
printf(" pack options:\n");
printf(" -i <dir> Input directory\n");
printf(" -o <file> Output file\n");
printf(" -m <mach> Machine flags\n");
printf(" -v Verbose output\n");
printf(" -t <time> Override date/time (dd/mm/yy hh:mm)\n");
printf(" (de)scramble options:\n");
printf(" -i <file> Input file\n");
printf(" -o <file> Output file\n");
exit(1);
}
int main(int argc, char **argv)
{
if(argc <= 1)
usage();
if(strcmp(argv[1], "--unpack") == 0)
return unpack(argc - 1, argv + 1);
if(strcmp(argv[1], "--pack") == 0)
return pack(argc - 1, argv + 1);
if(strcmp(argv[1], "--descramble") == 0 || strcmp(argv[1], "--scramble") == 0)
return descramble(argc - 1, argv + 1);
usage();
return 1;
}
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