mirror of
https://github.com/wiiu-env/libmocha.git
synced 2024-09-08 18:23:20 +02:00
77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
#include "devoptab_fs.h"
|
|
#include "logger.h"
|
|
|
|
#include <mutex>
|
|
#include <sys/param.h>
|
|
|
|
ssize_t __fsa_read(struct _reent *r, void *fd, char *ptr, size_t len) {
|
|
if (!fd || !ptr) {
|
|
r->_errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
// Check that the file was opened with read access
|
|
__fsa_file_t *file = (__fsa_file_t *) fd;
|
|
if ((file->flags & O_ACCMODE) == O_WRONLY) {
|
|
r->_errno = EBADF;
|
|
return -1;
|
|
}
|
|
|
|
// cache-aligned, cache-line-sized
|
|
__attribute__((aligned(0x40))) uint8_t alignedBuffer[0x40];
|
|
|
|
auto *deviceData = (FSADeviceData *) r->deviceData;
|
|
|
|
std::lock_guard<FastLockWrapper> lock(deviceData->mutex);
|
|
|
|
size_t bytesRead = 0;
|
|
while (bytesRead < len) {
|
|
// only use input buffer if cache-aligned and read size is a multiple of cache line size
|
|
// otherwise read into alignedBuffer
|
|
uint8_t *tmp = (uint8_t *) ptr;
|
|
size_t size = len - bytesRead;
|
|
|
|
if ((uintptr_t) ptr & 0x3F) {
|
|
// read partial cache-line front-end
|
|
tmp = alignedBuffer;
|
|
size = MIN(size, 0x40 - ((uintptr_t) ptr & 0x3F));
|
|
} else if (size < 0x40) {
|
|
// read partial cache-line back-end
|
|
tmp = alignedBuffer;
|
|
} else {
|
|
// read whole cache lines
|
|
size &= ~0x3F;
|
|
}
|
|
|
|
// Limit each request to 1 MiB
|
|
if (size > 0x100000) {
|
|
size = 0x100000;
|
|
}
|
|
|
|
FSError status = FSAReadFile(deviceData->clientHandle, tmp, 1, size, file->fd, 0);
|
|
|
|
if (status < 0) {
|
|
DEBUG_FUNCTION_LINE_ERR("FSAReadFile(0x%08X, 0x%08X, 1, 0x%08X, 0x%08X, 0) failed: %s", deviceData->clientHandle, tmp, size, file->fd, FSAGetStatusStr(status));
|
|
if (bytesRead != 0) {
|
|
return bytesRead; // error after partial read
|
|
}
|
|
|
|
r->_errno = __fsa_translate_error(status);
|
|
return -1;
|
|
}
|
|
|
|
if (tmp == alignedBuffer) {
|
|
memcpy(ptr, alignedBuffer, status);
|
|
}
|
|
|
|
bytesRead += status;
|
|
ptr += status;
|
|
|
|
|
|
if ((size_t) status != size) {
|
|
return bytesRead; // partial read
|
|
}
|
|
}
|
|
|
|
return bytesRead;
|
|
} |