Reorganize library code into libs/ (#3119)

* Reorganize files into libs/{dolphin,JSystem,PowerPC_EABI_Support,revolution,TRK_MINNOW_DOLPHIN}

* Update configure.py and project.py for new libs structure

* Refactor `#include <dolphin/x.h>` -> `<x.h>`

* Remove `__REVOLUTION_SDK__` forwards from dolphin

* Fix dolphin/ references in revolution

* Wrap `#include <dolphin.h>` in `!__REVOLUTION_SDK__`

* Always build TRK against dolphin headers

* Resolve revolution SDK header resolution issues

libs/JSystem/src/JUtility/JUTDirectFile.cpp

@@ -0,0 +1,168 @@
+#include "JSystem/JSystem.h" // IWYU pragma: keep
+
+#include "JSystem/JUtility/JUTDirectFile.h"
+#include <os.h>
+#include "global.h"
+#include <stdint.h>
+
+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;
+	}
+
+	interrupts = OSEnableInterrupts();
+	mLength         = mFileInfo.length;
+	OSRestoreInterrupts(interrupts);
+
+	mPos    = 0;
+	mIsOpen = true;
+	return true;
+}
+
+static void dummy(JUTDirectFile* directFile) {
+	directFile->isOpened();
+}
+
+void JUTDirectFile::fclose() {
+	if (!isOpened()) {
+		return;
+	}
+
+	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 (!isOpened()) {
+		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) {
+		buf = NULL;
+		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;
+	}
+
+	u8* byteBuf   = (u8*)buf;
+	int readCount = 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 > len - 1) {
+			chunkSize = len - readCount - 1;
+		}
+
+		BOOL isAtEnd = FALSE;
+		for (int i = 0; i < chunkSize; i++) {
+			u8 byte = mSectorStart[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 >= len - 1) {
+			*byteBuf = 0;
+			break;
+		}
+	}
+
+	// if got to the end of the data, set final byte to 0.
+	if (mPos >= mLength) {
+		*byteBuf = 0;
+	}
+
+	return readCount;
+}