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#include "JSystem/JSystem.h" // IWYU pragma: keep
#include "JSystem/JUtility/JUTDirectFile.h"
#include <dolphin/os.h>
#include "global.h"
#include <stdint>
int JUTDirectFile::fetch32byte() {
mToRead = mLength - ALIGN_PREV(mPos, DVD_MIN_TRANSFER_SIZE);
if (mToRead > JUTDF_BUFSIZE) {
mToRead = JUTDF_BUFSIZE;
}
int interrupts = OSEnableInterrupts();
int readRes = DVDReadAsyncPrio(&mFileInfo, mSectorStart, ALIGN_NEXT(mToRead, DVD_MIN_TRANSFER_SIZE),
ALIGN_PREV(mPos, DVD_MIN_TRANSFER_SIZE), NULL, 2);
OSRestoreInterrupts(interrupts);
if (!readRes) {
return -1;
} else {
interrupts = OSEnableInterrupts();
while (DVDGetCommandBlockStatus(&mFileInfo.cb)) {
;
}
OSRestoreInterrupts(interrupts);
return mToRead;
}
}
JUTDirectFile::JUTDirectFile() {
mLength = 0;
mPos = 0;
mToRead = 0;
mSectorStart = (u8*)ALIGN_NEXT((uintptr_t)mBuffer, DVD_MIN_TRANSFER_SIZE);
mIsOpen = false;
}
JUTDirectFile::~JUTDirectFile() {
mIsOpen = false;
}
bool JUTDirectFile::fopen(const char* filename) {
if (!filename) {
return false;
}
int interrupts = OSEnableInterrupts();
int dvdRes = DVDOpen(const_cast<char*>(filename), &mFileInfo);
OSRestoreInterrupts(interrupts);
if (!dvdRes) {
mIsOpen = false;
return false;
}
int interrupts2 = OSEnableInterrupts();
mLength = mFileInfo.length;
OSRestoreInterrupts(interrupts2);
mPos = 0;
mIsOpen = true;
return true;
}
void JUTDirectFile::fclose() {
if (mIsOpen) {
int interrupts = OSEnableInterrupts();
DVDClose(&mFileInfo);
OSRestoreInterrupts(interrupts);
mIsOpen = false;
}
}
int JUTDirectFile::fgets(void* buf, int len) {
// if file isn't open, return error (-1).
if (!mIsOpen) {
return -1;
}
// if desired length to get is 0, get... 0 bytes.
if (len == 0) {
return 0;
}
// if desired length to get is 1, return 1.
// (final byte gotten is always 0, so len 1 is pointless).
if (len == 1) {
return 1;
}
// if buffer to read into doesn't exist, return error.
if (!buf) {
return -1;
}
// if we're already beyond the file length, return error.
if (mPos >= mLength) {
return -1;
}
int readMax;
u8* byteBuf = (u8*)buf;
int readCount = 0;
readMax = len - 1; // desired bytes of data to get (last value is then 0).
while (mPos < mLength) {
// if there's nothing left to read, return error.
if (mToRead == 0 && fetch32byte() < 0) {
return -1;
}
// read in each chunk.
u32 currPos = mPos & (JUTDF_BUFSIZE - 1);
u32 chunkSize = (mToRead - currPos);
if (readCount + chunkSize > readMax) {
chunkSize = len - readCount - 1;
}
BOOL isAtEnd = FALSE;
for (int i = 0; i < chunkSize; i++) {
u8 byte = mSectorStart[currPos];
currPos++;
*byteBuf++ = byte;
// if we hit the end of a line, stop reading.
if (byte == '\n') {
isAtEnd = TRUE;
chunkSize = i + 1;
break;
}
}
// if we exceed the buffer size, stop reading.
if (currPos >= JUTDF_BUFSIZE) {
mToRead = 0;
}
// if we hit the end of a line, set final byte to 0 and stop reading.
if (isAtEnd == TRUE) {
*byteBuf = 0;
mPos += chunkSize;
readCount += chunkSize;
break;
}
// we should have read the full chunkSize, so update count/pos.
mPos += chunkSize;
readCount += chunkSize;
// if we're at (or beyond) our desired length, set final byte to 0 and stop reading.
if (readCount >= readMax) {
*byteBuf = 0;
break;
}
}
// if got to the end of the data, set final byte to 0.
if (mPos >= mLength) {
*byteBuf = 0;
}
return readCount;
}
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