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Add devoptab support to replace the libioushax devoptab

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This commit is contained in:
Maschell
2022-07-22 14:46:29 +02:00
parent 6019c6947a
commit 2ac50e4392
35 changed files with 1572 additions and 14 deletions
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144
source/devoptab/devoptab_fsa_open.cpp Normal file
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#include "devoptab_fsa.h"
#include "logger.h"
#include <mutex>
// Extended "magic" value that allows opening files with FS_OPEN_FLAG_UNENCRYPTED in underlying FSOpenFileEx() call similar to O_DIRECTORY
#ifndef O_UNENCRYPTED
#define O_UNENCRYPTED 0x4000000
#endif
int __fsa_open(struct _reent *r,
void *fileStruct,
const char *path,
int flags,
int mode) {
FSAFileHandle fd;
FSError status;
const char *fsMode;
if (!fileStruct || !path) {
r->_errno = EINVAL;
return -1;
}
bool createFileIfNotFound = false;
bool failIfFileNotFound = false;
// Map flags to open modes
int commonFlagMask = O_CREAT | O_TRUNC | O_APPEND;
if (((flags & O_ACCMODE) == O_RDONLY) && !(flags & commonFlagMask)) {
fsMode = "r";
} else if (((flags & O_ACCMODE) == O_RDWR) && !(flags & commonFlagMask)) {
fsMode = "r+";
} else if (((flags & O_ACCMODE) == O_WRONLY) && ((flags & commonFlagMask) == (O_CREAT | O_TRUNC))) {
fsMode = "w";
} else if (((flags & O_ACCMODE) == O_RDWR) && ((flags & commonFlagMask) == (O_CREAT | O_TRUNC))) {
fsMode = "w+";
} else if (((flags & O_ACCMODE) == O_WRONLY) && ((flags & commonFlagMask) == (O_CREAT | O_APPEND))) {
fsMode = "a";
} else if (((flags & O_ACCMODE) == O_RDWR) && ((flags & commonFlagMask) == (O_CREAT | O_APPEND))) {
fsMode = "a+";
} else if (((flags & O_ACCMODE) == O_WRONLY) && ((flags & commonFlagMask) == (O_CREAT))) {
// Cafe OS doesn't have a matching mode for this, so we have to be creative and create the file.
createFileIfNotFound = true;
// It's not possible to open a file with write only mode which doesn't truncate the file
// Technically we could read from the file, but our read implementation is blocking this.
fsMode = "r+";
} else if (((flags & O_ACCMODE) == O_WRONLY) && ((flags & commonFlagMask) == (O_APPEND))) {
// Cafe OS doesn't have a matching mode for this, so we have to check if the file exists.
failIfFileNotFound = true;
fsMode = "a";
} else if (((flags & O_ACCMODE) == O_WRONLY) && ((flags & commonFlagMask) == (O_TRUNC))) {
// As above
failIfFileNotFound = true;
fsMode = "w";
} else {
r->_errno = EINVAL;
return -1;
}
char *fixedPath = __fsa_fixpath(r, path);
if (!fixedPath) {
r->_errno = ENOMEM;
return -1;
}
auto *file = (__fsa_file_t *) fileStruct;
strncpy(file->fullPath, fixedPath, sizeof(file->fullPath) - 1);
free(fixedPath);
// Prepare flags
FSOpenFileFlags openFlags = (flags & O_UNENCRYPTED) ? FS_OPEN_FLAG_UNENCRYPTED : FS_OPEN_FLAG_NONE;
FSMode translatedMode = __fsa_translate_permission_mode(mode);
uint32_t preAllocSize = 0;
// Init mutex and lock
file->mutex.init(file->fullPath);
std::lock_guard<MutexWrapper> lock(file->mutex);
auto *deviceData = (FSADeviceData *) r->deviceData;
if (createFileIfNotFound || failIfFileNotFound || (flags & (O_EXCL | O_CREAT)) == (O_EXCL | O_CREAT)) {
// Check if file exists
FSAStat stat;
status = FSAGetStat(deviceData->clientHandle, file->fullPath, &stat);
if (status == FS_ERROR_NOT_FOUND) {
if (createFileIfNotFound) { // Create new file if needed
status = FSAOpenFileEx(deviceData->clientHandle, file->fullPath, "w", translatedMode,
openFlags, preAllocSize, &fd);
if (status == FS_ERROR_OK) {
if (FSACloseFile(deviceData->clientHandle, fd) != FS_ERROR_OK) {
DEBUG_FUNCTION_LINE_ERR("FSACloseFile(0x%08X, 0x%08X) (%s) failed: %s",
deviceData->clientHandle, fd, file->fullPath, FSAGetStatusStr(status));
}
fd = -1;
} else {
DEBUG_FUNCTION_LINE_ERR("FSAOpenFileEx(0x%08X, %s, %s, 0x%X, 0x%08X, 0x%08X, 0x%08X) failed: %s",
deviceData->clientHandle, file->fullPath, "w", translatedMode, openFlags, preAllocSize, &fd,
FSAGetStatusStr(status));
r->_errno = __fsa_translate_error(status);
return -1;
}
} else if (failIfFileNotFound) { // Return an error if we don't we create new files
r->_errno = __fsa_translate_error(status);
return -1;
}
} else if (status == FS_ERROR_OK) {
// If O_CREAT and O_EXCL are set, open() shall fail if the file exists.
if ((flags & (O_EXCL | O_CREAT)) == (O_EXCL | O_CREAT)) {
r->_errno = EEXIST;
return -1;
}
}
}
status = FSAOpenFileEx(deviceData->clientHandle, file->fullPath, fsMode, translatedMode, openFlags, preAllocSize, &fd);
if (status < 0) {
DEBUG_FUNCTION_LINE_ERR("FSAOpenFileEx(0x%08X, %s, %s, 0x%X, 0x%08X, 0x%08X, 0x%08X) failed: %s",
deviceData->clientHandle, file->fullPath, fsMode, translatedMode, openFlags, preAllocSize, &fd,
FSAGetStatusStr(status));
r->_errno = __fsa_translate_error(status);
return -1;
}
file->fd = fd;
file->flags = (flags & (O_ACCMODE | O_APPEND | O_SYNC));
// Is always 0, even if O_APPEND is set.
file->offset = 0;
if (flags & O_APPEND) {
FSAStat stat;
status = FSAGetStatFile(deviceData->clientHandle, fd, &stat);
if (status < 0) {
DEBUG_FUNCTION_LINE_ERR("FSAGetStatFile(0x%08X, 0x%08X, 0x%08X) (%s) failed: %s",
deviceData->clientHandle, fd, &stat, file->fullPath, FSAGetStatusStr(status));
r->_errno = __fsa_translate_error(status);
if (FSACloseFile(deviceData->clientHandle, fd) < 0) {
DEBUG_FUNCTION_LINE_ERR("FSACloseFile(0x%08X, 0x%08X) (%d) failed: %s",
deviceData->clientHandle, fd, file->fullPath, FSAGetStatusStr(status));
}
return -1;
}
file->appendOffset = stat.size;
}
return 0;
}