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// tap.cpp
// Revision 13-dec-2004
#include "tap.h"
#include <algorithm>
using std::fill;
tap::CodeHeader::CodeHeader (address init, address size,
const std::string & filename)
{
//memset (block, 0, sizeof (block) );
fill (block, block + sizeof (block), byte (0) );
block [0]= 19; // Length of block: 17 bytes + flag + checksum
block [1]= 0;
block [2]= 0; // Flag: 00 -> header
block [3]= 3; // Type: code block.
// File name.
std::string::size_type l= filename.size ();
if (l > 10)
l= 10;
for (std::string::size_type i= 0; i < 10; ++i)
block [4 + i]= i < l ? filename [i] : ' ';
// Length of the code block.
block [14]= lobyte (size);
block [15]= hibyte (size);
// Start of the code block.
block [16]= lobyte (init);
block [17]= hibyte (init);
// Parameter 2: 32768 in a code block.
block [18]= 0x00;
block [19]= 0x80;
// Checksum
byte check= block [2]; // Flag byte included.
for (int i= 3; i < 20; ++i)
check^= block [i];
block [20]= check;
}
void tap::CodeHeader::write (std::ostream & out) const
{
out.write (reinterpret_cast <const char *> (block), sizeof (block) );
}
tap::CodeBlock::CodeBlock (address sizen, const byte * datan) :
datasize (sizen),
data (datan)
{
address blocksize= datasize + 2; // Code + flag + checksum.
head [0]= lobyte (blocksize);
head [1]= hibyte (blocksize);
head [2]= 0xFF; // Flag: data block.
// Compute the checksum.
check= 0xFF; // Flag byte included.
for (int i= 0; i < datasize; ++i)
check^= data [i];
}
void tap::CodeBlock::write (std::ostream & out) const
{
out.write (reinterpret_cast <const char *> (head), sizeof (head) );
out.write (reinterpret_cast <const char *> (data), datasize);
out.write (reinterpret_cast <const char *> (& check), 1);
}
address tap::CodeBlock::size () const
{
return datasize + sizeof (head) + 1;
}
tap::BasicHeader::BasicHeader (const std::string & basic)
{
block [0]= 19;
block [1]= 0;
block [2]= 0; // Flag: header.
block [3]= 0; // Type: Basic block.
for (int i= 0; i < 10; ++i)
block [4 + i]= "loader " [i];
// Length of the basic block.
const address basicsize= static_cast <address> (basic.size () );
block [14]= lobyte (basicsize);
block [15]= hibyte (basicsize);
// Autostart in line 10.
block [16]= '\x0A';
block [17]= '\x00';
// Start of variable area: at the end.
block [18]= block [14];
block [19]= block [15];
// Checksum
byte check= block [2]; // Flag byte included.
for (int i= 3; i < 20; ++i)
check^= block [i];
block [20]= check;
}
void tap::BasicHeader::write (std::ostream & out) const
{
out.write (reinterpret_cast <const char *> (block), sizeof (block) );
}
tap::BasicBlock::BasicBlock (const std::string & basicn) :
basic (basicn),
basicsize (static_cast <address> (basic.size () ) )
{
address blocksize= basicsize + 2; // Code + flag + checksum.
block [0]= blocksize & 0xFF;
block [1]= blocksize >> 8;
block [2]= 0xFF; // Flag: data block.
// Compute the checksum.
check= 0xFF; // Flag byte included.
for (int i= 0; i < basicsize; ++i)
check^= static_cast <unsigned char> (basic [i]);
}
void tap::BasicBlock::write (std::ostream & out) const
{
out.write (reinterpret_cast <const char *> (block), sizeof (block) );
out.write (basic.data (), basicsize);
out.write (reinterpret_cast <const char *> (& check), 1);
}
// End of tap.cpp
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