memory/readfile.cpp at master · stephenbennyhat/memory · GitHub

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#include <fstream>
#include <iostream>
#include <ios>
#include <string>
#include "mem.h"

using namespace mem;

namespace {
    addr
    readhex(std::istream& is, int width) {
       int v = 0;
       for (int i = 0; i < width; i++) {
           char ch;
           int digit =  0;
           is >> ch;
           if (!is) {
               throw "Parse Error";
           }
           else if (ch >= 'A' && ch <= 'F') {
               digit = ch - 'A' + 10;
           }
           else if (ch >= 'a' && ch <= 'f') {
               digit = ch - 'a' + 10;
           }
           else if (ch >= '0' && ch <= '9') {
               digit = ch - '0';
           }
           else {
               throw "Unexpected digit";
           }
           v = v << 4 | digit;
       }
       return v;
    }

    void
    chksum(byte chk, addr a, int lineno, std::istream& is, std::string const& filename)
    {
        chk += (a >> 24);
        chk += (a >> 16);
        chk += (a >>  8);
        chk += (a >>  0);
        chk += readhex(is, 2);
        if (chk != 0xFF) {
            std::cerr << filename << ":" << lineno << ": "
                      << "chk err: "
                      << std::hex << std::showbase << int(chk)
                      << std::endl;
        }
    }

    } // namespace

    namespace mem {

    void
    readmoto(std::string const& filename, memory& mem) {
        std::ifstream is(filename.c_str());
        if (is.fail()) {
            std::cerr << "couldn't open: \"" << filename << "\"" << std::endl;
            return;
        }
        readmoto(is, mem, filename);
    }

    void
    readmoto(std::istream& is, memory& mem, std::string const& filename) {
        std::string line;
        int lineno = 1;
        unsigned rcnt = 0;
        do {
            char ch;
            is >> ch;
            if (ch != 'S') {
                if (is)
                    std::cerr << filename << ":" << lineno << ": "
                              << "not an srecord:\"" << line << "\"" << std::endl;
            }
            else {
                is >> ch;

                if (ch >= '1' && ch <= '3') {
                    int addrlen = 1 + ch - '0';
                    int count = readhex(is, 2);
                    byte chk = (byte) count;
                    count -= addrlen + 1; // just data bytes.
                    addr a = readhex(is, addrlen * 2);
                    if (0) std::cerr << std::hex << "addr=" << a
                                     << std::dec << " count=" << count
                                     << std::endl;
                    for (int i = 0; i < count; i++) {
                        byte b = (byte) readhex(is, 2);
                        mem[a+i] = b;
                        chk += b;
                    }
                    chksum(chk, a, lineno, is, filename);
                    rcnt++;
                }
                else if (ch == '5') {
                    int addrlen = 2;
                    int count = readhex(is, 2);
                    byte chk = (byte) count;
                    count -= addrlen + 1; // just data bytes.
                    addr a = readhex(is, addrlen * 2);
                    if (rcnt != a) {
                        std::cerr << filename << ":" << lineno << ": "
                                  << "record count: " << std::hex << int(rcnt) << "!=" << a
                                  << std::endl;
                    }
                    chksum(chk, a, lineno, is, filename);
                }
                else if (ch >= '7' && ch <= '9') {
                    int addrlen = 11 + '0' - ch;
                    int count = readhex(is, 2);
                    byte chk = (byte) count;
                    addr a = readhex(is, addrlen * 2);
                    mem.setexecaddr(a);
                    chksum(chk, a, lineno, is, filename);
                }
                else if (ch == '0') {
                    int addrlen = 2;
                    int count = readhex(is, 2);
                    byte chk = (byte) count;
                    count -= addrlen + 1; // just data bytes.
                    addr a = readhex(is, addrlen * 2);
                    std::string s;
                    for (int i = 0; i < count; i++) {
                        char ch = (char) readhex(is, 2);
                        chk += ch;
                        s.push_back(ch);
                    }
                    mem.setdesc(s);
                    chksum(chk, a, lineno, is, filename);
                }
                else {
                    std::cerr << filename << ":" << lineno << ": "
                              << "ignored: S" << ch
                              << std::endl;
                }
            }
            std::string line;
            getline(is, line);
            lineno++;
        }
        while (is);
    }
}