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// srecord.h - classes to read/write Motorola S-record files
//
// Copyright (c) 2011 by Andrew W. Phillips.
//
// This file is distributed under the MIT license, which basically says
// you can do what you want with it but I take no responsibility for bugs.
// See http://www.opensource.org/licenses/mit-license.php for full details.
//

#ifndef SRECORD_INCLUDED
#define SRECORD_INCLUDED


// Writes Motorola S-records to a file from data in memory
class CWriteSRecord
{
public:
	CWriteSRecord(const char *filename, unsigned long base_addr = 0L, int stype = 3, size_t reclen = 32);
	~CWriteSRecord();
	void Put(const void *data, size_t len, unsigned long address = UINT_MAX);
	CString Error() const { return error_; }

private:
	void put_rec(int stype, unsigned long addr, void *data, size_t len);
	int put_hex(char *pstart, unsigned long val, int bytes);

	CStdioFile file_;
	int stype_;                         // preferred record type: 1 = S1, 2 = S2, 3 = S3
	unsigned long addr_;                // Address of next S record to write
	size_t reclen_;                     // Preferred output record size
	CString error_;                     // Error message for last error (if any)
	int recs_out_;                      // Number of S1/S2/S3 records output so far
};

// This class can be used to read a file containing Motorola S-records into memory.
// It handles any combination of S1,S2,S3 records but the records must be in address order.
class CReadSRecord
{
public:
	CReadSRecord(const char *filename, BOOL allow_discon = FALSE);
	size_t Get(void *data, size_t max, unsigned long &address); // Get a line of data (S1/S2/S3) from the file
	CString Error() const { return error_; }

private:
	int get_rec(void *data, size_t max_len, size_t &len, unsigned long &address);
	unsigned long get_hex(char *pstart, int bytes, int &checksum);
	CStdioFile file_;
	unsigned long addr_;                // Address of next record to be read or -1 if at start
	unsigned long line_no_;             // Line number of last line of text read
	CString error_;                     // Error message for last error (if any)
	int recs_in_;                       // Number of S1/S2/S3 records read so far
	BOOL allow_discon_;                 // Allow discontiguous records
};
#endif