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expand and reduce track image in memory

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This commit is contained in:
Christopher Mosher 2019-01-01 09:12:19 -05:00
parent 97752f06ff
commit a1bb8b9dd8
3 changed files with 289 additions and 71 deletions
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42
src/steppermotor.cpp
View File

@ -83,7 +83,7 @@ void StepperMotor::setMagnet(const unsigned char magnet, const bool on) {
this->mags &= ~mask;
}
// const std::uint8_t oldQT = this->quarterTrack;
const std::uint8_t oldQT = this->quarterTrack;
const char newPos = mapMagPos[this->mags];
char d = 0;
@ -91,6 +91,20 @@ void StepperMotor::setMagnet(const unsigned char magnet, const bool on) {
d = calcDeltaPos(this->pos,newPos);
this->pos = newPos;
// TODO: delay moving arm by a small amount
// For example, Locksmith, in order to write "quarter tracks" (i.e., T+.25 or T+.75), it positions
// to the correct track (by turning two adjacent magnets on), then turns them both off in rapid
// succession. In real life the arm doesn't move in such a case. In order to emulate that, we need
// to delay the arm move for a bit, to see if the magnets change in the meantime.
/*
* ARM: ph2 + [..*.] T$0D.00 +0.00
* ARM: ph3 + [..**] T$0D.25 --> +0.25
* switching from tmap[34] --> [35]
*
* ARM: ph3 - [..*.] T$0D.00 <-- -0.25 <-\
* switching from tmap[35] --> [34] <--\-- this needs to get delayed
* ARM: ph2 - [....] T$0D.00 +0.00
*/
this->quarterTrack += d;
if (this->quarterTrack < 0)
this->quarterTrack = 0;
@ -98,18 +112,18 @@ void StepperMotor::setMagnet(const unsigned char magnet, const bool on) {
this->quarterTrack = QTRACKS-1;
}
// const std::uint8_t newQT = this->quarterTrack;
// const std::int8_t deltaQT = newQT - oldQT;
const std::uint8_t newQT = this->quarterTrack;
const std::int8_t deltaQT = newQT - oldQT;
// printf("ARM: ph%d %s [%c%c%c%c] T$%02X.%02d %s %+0.2f\n",
// (std::uint8_t)magnet,
// on ? "+" : "-",
// (mags&1)?'*':'.',
// (mags&2)?'*':'.',
// (mags&4)?'*':'.',
// (mags&8)?'*':'.',
// this->quarterTrack / 4,
// (this->quarterTrack % 4) * 25,
// deltaQT>0 ? "-->" : deltaQT<0 ? "<--" : " ",
// (deltaQT % 4) / 4.0);
printf("ARM: ph%d %s [%c%c%c%c] T$%02X.%02d %s %+0.2f\n",
(std::uint8_t)magnet,
on ? "+" : "-",
(mags&1)?'*':'.',
(mags&2)?'*':'.',
(mags&4)?'*':'.',
(mags&8)?'*':'.',
this->quarterTrack / 4,
(this->quarterTrack % 4) * 25,
deltaQT>0 ? "-->" : deltaQT<0 ? "<--" : " ",
(deltaQT % 4) / 4.0);
}

306
src/wozfile.cpp
View File

@ -58,8 +58,61 @@ static void print_compat(std::uint16_t compat, std::uint16_t mask, const char *n
}
}
void WozFile::dumpTmap() {
printf("\x1b[31;47m-------------------------------------------------\x1b[0m\n");
for (std::uint8_t qt(0); qt < C_QTRACK; ++qt) {
const std::uint16_t t(qt*25);
if (this->tmap[qt] == 0xFFu) {
printf("\x1b[31;47m");
}
if (t % 100) {
printf("TMAP[0x%02X] track 0x%02X +.%02d: TRKS track index 0x%02X", qt, t/100, t%100, this->tmap[qt]);
} else {
printf("TMAP[0x%02X] track 0x%02X : TRKS track index 0x%02X", qt, t/100, this->tmap[qt]);
}
printf("\x1b[0m");
if (qt == this->initialQtrack && qt == this->finalQtrack) {
printf(" <-- lone track");
} else if (qt == this->initialQtrack) {
printf(" <-- initial track");
} else if (qt == this->finalQtrack) {
printf(" <-- final track");
}
printf("\n");
}
printf("\x1b[31;47m-------------------------------------------------\x1b[0m\n");
}
void WozFile::dumpTracks() {
for (std::uint8_t qt(0); qt < C_QTRACK; ++qt) {
if (this->trk[qt]) {
printf("TRK index %02X: %08x bytes; %08x bits ", qt, this->trk_byts[qt], this->trk_bits[qt]);
printf("("
BYTE_TO_BINARY_PATTERN
BYTE_TO_BINARY_PATTERN
BYTE_TO_BINARY_PATTERN
BYTE_TO_BINARY_PATTERN
BYTE_TO_BINARY_PATTERN
BYTE_TO_BINARY_PATTERN
BYTE_TO_BINARY_PATTERN
BYTE_TO_BINARY_PATTERN
"...)\n",
BYTE_TO_BINARY(this->trk[qt][0]),
BYTE_TO_BINARY(this->trk[qt][1]),
BYTE_TO_BINARY(this->trk[qt][2]),
BYTE_TO_BINARY(this->trk[qt][3]),
BYTE_TO_BINARY(this->trk[qt][4]),
BYTE_TO_BINARY(this->trk[qt][5]),
BYTE_TO_BINARY(this->trk[qt][6]),
BYTE_TO_BINARY(this->trk[qt][7]));
}
}
}
bool WozFile::load(const std::string& filePath) {
std::ifstream in(filePath.c_str(),std::ios::binary|std::ios::in);
printf("Reading WOZ 2.0 file: %s\n", filePath.c_str());
std::ifstream in(filePath.c_str(), std::ios::binary|std::ios::in);
if (!in.is_open()) {
printf("Error opening file: %d\n", errno);
return false;
@ -159,28 +212,7 @@ bool WozFile::load(const std::string& filePath) {
printf("Could not find any final track (%02X).\n", this->finalQtrack);
}
printf("\x1b[31;47m-------------------------------------------\x1b[0m\n");
for (std::uint8_t qt(0); qt < chunk_size; ++qt) {
const std::uint16_t t(qt*25);
if (tmap[qt] == 0xFFu) {
printf("\x1b[31;47m");
}
if (t % 100) {
printf("TMAP track 0x%02X +.%02d: TRKS track index 0x%02X", t/100, t%100, tmap[qt]);
} else {
printf("TMAP track 0x%02X : TRKS track index 0x%02X", t/100, tmap[qt]);
}
printf("\x1b[0m");
if (qt == this->initialQtrack && qt == this->finalQtrack) {
printf(" <-- lone track");
} else if (qt == this->initialQtrack) {
printf(" <-- initial track");
} else if (qt == this->finalQtrack) {
printf(" <-- final track");
}
printf("\n");
}
printf("\x1b[31;47m-------------------------------------------\x1b[0m\n");
dumpTmap();
}
break;
case 0x534B5254: { // TRKS
@ -264,21 +296,7 @@ bool WozFile::load(const std::string& filePath) {
this->loaded = true;
this->modified = false;
// TODO if the file is not write protected, then "fill out" our tracks:
// 1. create new TRKS entries and full copies of duplicate TMAP pointers
// 2. create new TRKS entries (and fill with zeroes) for FF entries in TMAP. (with length of avg of adjacent tracks?)
//
// ...
// 6.50: FF x 08 - 00 00 00
// 6.75: 02 \ 02 - d5 aa 96
// 7.00: 02 - d5 aa 96 03 - d5 aa 96
// 7.25: 02 / 04 - d5 aa 96
// 7.50: FF x 09 - 00 00 00
// 7.75: 05 \ 05 - d5 aa 96
// 8.00: 05 - d5 aa 96 06 - d5 aa 96
// 8.25: 05 / 07 - d5 aa 96
// 8.50: FF x 0A - 00 00 00
// ...
expandTracks();
return true;
}
@ -297,6 +315,11 @@ void WozFile::save() {
if (isWriteProtected() || !isLoaded()) {
return;
}
printf("Saving WOZ 2.0 file: %s\n", filePath.c_str());
reduceTracks();
std::ofstream out(filePath.c_str(), std::ios::binary);
std::uint32_t woz2(0x325A4F57u);
@ -340,6 +363,7 @@ void WozFile::save() {
std::uint16_t ram(0);
out.write((char*)&ram, sizeof(ram));
std::uint16_t largest_track(0);
for (std::uint8_t qt(0); qt < C_QTRACK; ++qt) {
if (largest_track < (this->trk_byts[qt]>>9)) {
@ -376,10 +400,16 @@ void WozFile::save() {
uint16_t block(3);
for (std::uint8_t qt(0); qt < C_QTRACK; ++qt) {
struct trk_t ts;
ts.blockFirst = block;
ts.blockCount = (this->trk_byts[qt]>>9);
block += ts.blockCount;
ts.bitCount = this->trk_bits[qt];
if (this->trk_byts[qt]) {
ts.blockFirst = block;
ts.blockCount = (this->trk_byts[qt]>>9);
block += ts.blockCount;
ts.bitCount = this->trk_bits[qt];
} else {
ts.blockFirst = 0;
ts.blockCount = 0;
ts.bitCount = 0;
}
out.write((char*)&ts, sizeof(ts));
}
@ -393,8 +423,9 @@ void WozFile::save() {
out.close();
this->modified = false;
}
expandTracks();
}
void WozFile::unload() {
this->bit = 0x80u;
this->byt = 0x00u;
@ -402,18 +433,13 @@ void WozFile::unload() {
this->loaded = false;
this->filePath = "";
this->modified = false;
for (int i(0); i < C_QTRACK; ++i) {
removeTrack(i);
}
if (this->tmap) {
delete [] this->tmap;
this->tmap = 0;
}
for (int i(0); i < C_QTRACK; ++i) {
if (this->trk[i]) {
delete [] this->trk[i];
this->trk[i] = 0;
}
this->trk_bits[i] = 0;
this->trk_byts[i] = 0;
}
}
static std::uint8_t bc(std::uint8_t bit) {
@ -485,6 +511,7 @@ void WozFile::rotateOneBit(std::uint8_t currentQuarterTrack) {
// previous, based on each track's length (tracks can be of
// different lengths in the WOZ image).
if (currentQuarterTrack != this->lastQuarterTrack) {
printf("switching from tmap[%02x] --> [%02x]\n", this->lastQuarterTrack, currentQuarterTrack);
const double oldLen = this->trk_bits[this->tmap[this->lastQuarterTrack]];
const double newLen = this->trk_bits[this->tmap[currentQuarterTrack]];
const double ratio = newLen/oldLen;
@ -521,6 +548,14 @@ bool WozFile::getBit(std::uint8_t currentQuarterTrack) {
return this->trk[this->tmap[currentQuarterTrack]][this->byt] & this->bit;
}
void WozFile::rawSet(std::uint8_t currentQuarterTrack, bool on) {
if (on) {
this->trk[this->tmap[currentQuarterTrack]][this->byt] |= this->bit;
} else {
this->trk[this->tmap[currentQuarterTrack]][this->byt] &= ~this->bit;
}
}
void WozFile::setBit(std::uint8_t currentQuarterTrack, bool on) {
if (!isLoaded()) {
return; // there's no disk to write data to
@ -531,13 +566,170 @@ void WozFile::setBit(std::uint8_t currentQuarterTrack, bool on) {
}
// printf("%c",(on?'1':'0')); fflush(stdout);
if (on) {
this->trk[this->tmap[currentQuarterTrack]][this->byt] |= this->bit;
} else {
this->trk[this->tmap[currentQuarterTrack]][this->byt] &= ~this->bit;
rawSet(currentQuarterTrack, on);
// also write preceding and following quarter tracks (at relative position, and if they exist)
if (0 < currentQuarterTrack) {
rawSet(currentQuarterTrack-1, on);
}
if (currentQuarterTrack < C_QTRACK-1) {
rawSet(currentQuarterTrack+1, on);
}
this->modified = true;
// TODO: also write preceding and following quarter tracks (at relative position, and if they exist)
}
void WozFile::removeTrack(const int trackIndex) {
if (this->trk[trackIndex]) {
delete [] this->trk[trackIndex];
this->trk[trackIndex] = 0;
}
this->trk_bits[trackIndex] = 0;
this->trk_byts[trackIndex] = 0;
}
bool WozFile::trackIsZeroes(std::uint8_t qt) {
for (std::uint16_t byt = 0; byt < this->trk_byts[qt]; ++byt) {
if (this->trk[qt][byt]) {
return false;
}
}
return true;
}
bool WozFile::tracksAreIdentical(std::uint8_t qt1, std::uint8_t qt2) {
if (this->trk_bits[qt1] != this->trk_bits[qt2]) {
return false;
}
for (std::uint16_t byt = 0; byt < this->trk_byts[qt1]; ++byt) {
if (this->trk[qt1][byt] != this->trk[qt2][byt]) {
return false;
}
}
return true;
}
// opposite of expandTracks()
void WozFile::reduceTracks() {
for (std::uint8_t qt(0); qt < C_QTRACK; ++qt) {
if (trackIsZeroes(this->tmap[qt])) {
removeTrack(this->tmap[qt]);
this->tmap[qt] = 0xFFu;
}
}
for (std::uint8_t qt(0); qt < C_QTRACK-1; ++qt) {
for (std::uint8_t qto(qt+1); qto < C_QTRACK; ++qto) {
if (this->tmap[qt] != 0xFFu && this->tmap[qto] != 0xFFu && this->tmap[qt] != this->tmap[qto]) {
if (tracksAreIdentical(this->tmap[qt], this->tmap[qto])) {
removeTrack(this->tmap[qto]);
this->tmap[qto] = this->tmap[qt];
}
}
}
}
// kludge? remove track $22.25 if standard disk
for (std::uint8_t qt(C_QTRACK-1); qt >= 0x89; --qt) {
if (this->tmap[qt] != 0xFFu) {
if (qt == 0x89) {
if (this->tmap[qt] == this->tmap[qt-1]) {
this->tmap[qt] = 0xFFu;
}
}
break;
}
}
dumpTmap();
dumpTracks();
}
static std::uint16_t bytesForBits(const std::uint32_t c_bits) {
std::uint16_t c_bytes = (c_bits + 7) / 8;
return static_cast<std::uint16_t>(c_bytes + 0x1FFu) / 0x200 * 0x200;
}
void WozFile::expandTracks() {
for (std::uint8_t qt(0); qt < C_QTRACK; ++qt) {
if (this->tmap[qt] != 0xFFu) {
for (std::uint8_t qto(qt-1); qto != 0xFFu; --qto) {
if (this->tmap[qt] == this->tmap[qto]) {
copyTrack(qt, qto);
}
}
} else {
createNewTrack(qt);
}
}
}
void WozFile::copyTrack(std::uint8_t qt_dest, std::uint8_t qt_src) {
for (std::uint8_t t(0); t < C_QTRACK; ++t) {
if (!this->trk[t]) {
this->tmap[qt_dest] = t;
break;
}
}
this->trk_bits[this->tmap[qt_dest]] = this->trk_bits[this->tmap[qt_src]];
this->trk_byts[this->tmap[qt_dest]] = this->trk_byts[this->tmap[qt_src]];
this->trk[this->tmap[qt_dest]] = new std::uint8_t[this->trk_byts[this->tmap[qt_dest]]];
memcpy(this->trk[this->tmap[qt_dest]], this->trk[this->tmap[qt_src]], this->trk_byts[this->tmap[qt_dest]]);
}
void WozFile::createNewTrack(const std::uint8_t qt) {
if (this->tmap[qt] != 0xFFu) { // track already exists
return;
}
for (std::uint8_t t(0); t < C_QTRACK; ++t) {
if (!this->trk[t]) {
this->tmap[qt] = t;
break;
}
}
if (this->tmap[qt] == 0xFFu) {
printf("Cannot create track %d\n", qt);
return;
}
this->trk_bits[this->tmap[qt]] = calcNewTrackLengthBits(qt);
this->trk_byts[this->tmap[qt]] = bytesForBits(this->trk_bits[this->tmap[qt]]);
this->trk[this->tmap[qt]] = new std::uint8_t[this->trk_byts[this->tmap[qt]]];
memset(this->trk[this->tmap[qt]], 0, this->trk_byts[this->tmap[qt]]);
}
/*
* example:
* tmap[] track length in bits
* 17 = 06 --> 50000
* 18 = FF -X
* 19 = 07 --> 50002
*
* calcNewTrackLengthBits(18) returns 50001
*/
std::uint32_t WozFile::calcNewTrackLengthBits(const std::uint8_t qt) {
uint32_t t1 = 0;
for (int t(qt-1); t >= 0; --t) {
if (this->tmap[t] != 0xFFu) {
t1 = this->trk_bits[this->tmap[t]];
break;
}
}
uint32_t t2 = 0;
for (int t(qt+1); t < C_QTRACK; ++t) {
if (this->tmap[t] != 0xFFu) {
t2 = this->trk_bits[this->tmap[t]];
break;
}
}
// corner case: no existing tracks at all
if (!t1 && !t2) {
return 0xC5C0u;
}
// nominal case: average flanking tracks
if (t1 && t2) {
return (t1+t2)/2;
}
// odd cases: first or last track
return t1 ? t1 : t2;
}

12
src/wozfile.h
View File

@ -94,6 +94,17 @@ class WozFile {
std::string creator;
void checkForWriteProtection();
void expandTracks();
void reduceTracks();
bool trackIsZeroes(std::uint8_t qt);
bool tracksAreIdentical(std::uint8_t qt1, std::uint8_t qt2);
void removeTrack(const int trackIndex);
std::uint32_t calcNewTrackLengthBits(std::uint8_t qt);
void copyTrack(std::uint8_t qt_dest, std::uint8_t qt_src);
void createNewTrack(const std::uint8_t qt);
void dumpTmap();
void dumpTracks();
void rawSet(std::uint8_t currentQuarterTrack, bool on);
public:
WozFile();
@ -122,6 +133,7 @@ public:
void rotateOneBit(std::uint8_t currentQuarterTrack);
bool getBit(std::uint8_t currentQuarterTrack);
void setBit(std::uint8_t currentQuarterTrack, bool on);
void rawSet();
};
#endif // WOZFILE_H