patchver.c

#define _CRT_SECURE_NO_WARNINGS

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#pragma pack(1)
typedef struct header_prg {
	int magic; // 0xa55a5aa5
	int file_length; //payload file lehght
	int file_crc; //payload file CRC32?
	int version;
	int volume; //1
	int zero1;
	char filename[16];
	char filedate[24];
	int zeros1[2];
	int ffs0[14]; //0xFF 
	int magic1; // 0xa55a5aa5
	int zero2;
	int file_length_prg; //one more time - payload file lehght
	int file_crc1; //one more time - payload file CRC32?
	int magic2[3]; // const: 0x00104788, 0x04104788, 0x06000010
	int ffs1[16]; //0xFF 
	int ffs2[16]; //0xFF 
	int ffs3[16]; //0xFF 
	int ffs4[16]; //0xFF 
	int ffs5[16]; //0xFF 
	int ffs6[8]; //0xFF
	int ver_crc; // up to
} header_typeprg;

#pragma pack(1)
typedef struct header_st {
	int magic; // 0xa55a5aa5       // 00
	int len;   // len of ver file  // 04
	int version; //version         // 08
	int volume; //1                // 0C
	int zero1;                     // 10
	int a2c; //2c                  // 14	
	int nb0_length; //payload file lehght //18
	int nb0_crc; //payload file CRC32? //1C
	int version1; // same version     // 20
	int volume1; //1                  // 24   
	int zero2;                        // 28
	int nfiles; //1                   // 2C
	int dirdepth; //1                 // 30
	char dirname[64];                 // 34 
	int filestoprocess; //1           // 74
	char filename[56];                // 78 
	int file_length;                  // B0
	int file_crc;                     // B4
	//----
	//int magic1; // 0xa55a5aa5         // B8
	//int ver_crc; // up to and including magic1 //BC
} header_type;


static const unsigned int crc32_table[] =
{
	0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,	0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
	0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,	0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
	0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,	0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
	0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,	0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
	0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,	0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
	0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,	0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
	0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,	0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
	0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,	0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
	0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,	0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
	0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,	0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
	0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,	0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
	0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,	0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
	0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,	0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
	0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,	0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
	0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,	0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
	0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,	0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
	0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,	0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
	0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,	0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
	0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,	0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
	0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,	0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
	0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,	0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
	0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,	0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
	0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,	0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
	0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,	0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
	0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,	0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
	0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,	0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
	0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,	0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
	0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,	0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
	0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,	0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
	0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,	0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
	0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,	0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
	0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,	0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
};

unsigned int crc32b(const unsigned char* data, int len) {

	unsigned int crc;
	crc = 0xFFFFFFFF;

	if (len) do {
		crc = (crc >> 8) ^ crc32_table[(crc ^ *data) & 255];
		data++;
	} while (--len);

	return(~crc);
}

unsigned int checksum32(const unsigned char* data, int len) {
	int i;
	unsigned int crc, tmp, tmp1;
	crc = 0x00000000;
	tmp = 0;
	tmp1 = 0;
	len = len / 4;

	if (len > 0) do {

		for (i = 0; i < 4; i++) {
			tmp1 = *data;
			tmp = tmp + (tmp1 << 8 * i);
			data++;
		}
		crc = crc + tmp;
		tmp = 0;

	} while (--len);

	return(crc);
}



int main(int argc, char* argv[])
{
	printf("Usage: patchver [PS140PLT.PRG] [PS140PLT.VER] [output.nb0]\n");

	char* prg_filename = "PS140PLT.PRG";
	char* ver_filename = "PS140PLT.VER";
	char* nb0_filename = "output.nb0";

	if (argc == 4)
	{
		prg_filename = argv[1];
		ver_filename = argv[2];
		nb0_filename = argv[3];
	}

	printf("Patching: PRG='%s', VER='%s', NB0='%s' ...\n", prg_filename, ver_filename, nb0_filename);

	// read content of nb0 file into memory
	FILE* nb0_file = fopen(nb0_filename, "rb");
	if (nb0_file == NULL) 
	{
		printf("Can't read nb0 file with name '%s'\n", nb0_filename);
		exit(2);
	}
	fseek(nb0_file, 0L, SEEK_END);
	long nb0_file_size = ftell(nb0_file);
	fseek(nb0_file, 0L, SEEK_SET);
	void* nb0_buffer = malloc(nb0_file_size);
	if (nb0_buffer == NULL) 
	{
		printf("Can't allocate memory for nb0!\n");
		exit(2);
	}
	fread(nb0_buffer, 1, nb0_file_size, nb0_file);
	fclose(nb0_file);
	printf("Read %d bytes from nb0 file with name '%s'\n", nb0_file_size, nb0_filename);

	// read existing header of PRG file
	FILE* prg_file = fopen(prg_filename, "rb");
	if (prg_file == NULL)
	{
		printf("Can't open PRG file with name '%s'\n", prg_filename);
		exit(2);
	}
	header_typeprg prg_header;
	fread(&prg_header, sizeof(header_typeprg), 1, prg_file);
	fclose(prg_file);

	printf("Read original PRG header version=%x , date='%s'\n", prg_header.version, prg_header.filedate);

	// patching PRG header
	prg_header.file_length_prg = prg_header.file_length = nb0_file_size;
	int old_prg_version = prg_header.version;
	prg_header.version = prg_header.version + 1;
	prg_header.file_crc = prg_header.file_crc1 = checksum32(nb0_buffer, nb0_file_size);
	prg_header.ver_crc = checksum32(&prg_header, sizeof(prg_header) - 4);

	long prg_file_new_size = nb0_file_size + sizeof(prg_header);
	unsigned char* prg_buffer = malloc(prg_file_new_size);
	memcpy(prg_buffer, &prg_header, sizeof(prg_header));
	memcpy(prg_buffer + sizeof(prg_header), nb0_buffer, nb0_file_size);

	FILE* prg_file_new = fopen(prg_filename, "wb");
	fwrite(prg_buffer, 1, prg_file_new_size, prg_file_new);
	fclose(prg_file_new);

	printf("PRG file '%s' successfully patched version %x -> %x .\n", prg_filename, old_prg_version, prg_header.version);

	//reading existing header from VER file
	FILE* ver_file = fopen(ver_filename, "rb");
	if (ver_file == NULL)
	{
		printf("Can't open VER file with name '%s'\n", ver_filename);
		exit(2);
	}
	fseek(ver_file, 0L, SEEK_END);
	long ver_file_size = ftell(ver_file);
	fseek(ver_file, 0L, SEEK_SET);

	unsigned char* ver_buffer = malloc(ver_file_size);	
	fread(ver_buffer, 1, ver_file_size, ver_file);
	fclose(ver_file);
	

	//patching VER header
	header_type* ver_header = (header_type*)ver_buffer;
	char filename_ansi[1024];
	wcstombs(filename_ansi, ver_header->filename, 1024);
	if (strcmp(filename_ansi, prg_filename) != 0)
	{
		printf("Can't replace file with name '%s' to '%s' in VER file\n", filename_ansi, prg_filename);
		exit(2);
	}

	int old_ver_version = ver_header->version;
	ver_header->version = ver_header->version1 = ver_header->version + 1;
	ver_header->nb0_length = prg_header.file_length;
	ver_header->nb0_crc = prg_header.file_crc;
	ver_header->file_length = prg_file_new_size;
	ver_header->file_crc = crc32b(prg_buffer, prg_file_new_size);
	int* ver_crc_ptr = (int*)(ver_buffer + ver_file_size - 4);
	*ver_crc_ptr = crc32b(ver_buffer, ver_file_size - 4);

	//reading existing header from VER file
	FILE* ver_file_new = fopen(ver_filename, "wb");
	fwrite(ver_buffer, 1, ver_file_size, ver_file_new);
	fclose(ver_file_new);

	printf("VER file '%s' successfully patched. version %x -> %x .\n", ver_filename, old_ver_version, ver_header->version);

	printf("OK\n");

}