WiiUPluginLoaderBackend/source/fs/CFile.cpp
2022-02-04 16:35:53 +01:00

173 lines
3.6 KiB
C++

#include <cstdarg>
#include <cstdio>
#include <fs/CFile.hpp>
#include <strings.h>
CFile::CFile() {
iFd = -1;
mem_file = nullptr;
filesize = 0;
pos = 0;
}
CFile::CFile(const std::string &filepath, eOpenTypes mode) {
iFd = -1;
this->open(filepath, mode);
}
CFile::CFile(const uint8_t *mem, int32_t size) {
iFd = -1;
this->open(mem, size);
}
CFile::~CFile() {
this->close();
}
int32_t CFile::open(const std::string &filepath, eOpenTypes mode) {
this->close();
int32_t openMode = 0;
// This depend on the devoptab implementation.
// see https://github.com/devkitPro/wut/blob/master/libraries/wutdevoptab/devoptab_fs_open.c#L21 fpr reference
switch (mode) {
default:
case ReadOnly: // file must exist
openMode = O_RDONLY;
break;
case WriteOnly: // file will be created / zerod
openMode = O_TRUNC | O_CREAT | O_WRONLY;
break;
case ReadWrite: // file must exist
openMode = O_RDWR;
break;
case Append: // append to file, file will be created if missing. write only
openMode = O_CREAT | O_APPEND | O_WRONLY;
break;
}
//! Using fopen works only on the first launch as expected
//! on the second launch it causes issues because we don't overwrite
//! the .data sections which is needed for a normal application to re-init
//! this will be added with launching as RPX
iFd = ::open(filepath.c_str(), openMode);
if (iFd < 0)
return iFd;
filesize = ::lseek(iFd, 0, SEEK_END);
::lseek(iFd, 0, SEEK_SET);
return 0;
}
int32_t CFile::open(const uint8_t *mem, int32_t size) {
this->close();
mem_file = mem;
filesize = size;
return 0;
}
void CFile::close() {
if (iFd >= 0)
::close(iFd);
iFd = -1;
mem_file = nullptr;
filesize = 0;
pos = 0;
}
int32_t CFile::read(uint8_t *ptr, size_t size) {
if (iFd >= 0) {
int32_t ret = ::read(iFd, ptr, size);
if (ret > 0)
pos += ret;
return ret;
}
int32_t readsize = size;
if (readsize > (int64_t) (filesize - pos))
readsize = filesize - pos;
if (readsize <= 0)
return readsize;
if (mem_file != nullptr) {
memcpy(ptr, mem_file + pos, readsize);
pos += readsize;
return readsize;
}
return -1;
}
int32_t CFile::write(const uint8_t *ptr, size_t size) {
if (iFd >= 0) {
size_t done = 0;
while (done < size) {
int32_t ret = ::write(iFd, ptr, size - done);
if (ret <= 0)
return ret;
ptr += ret;
done += ret;
pos += ret;
}
return done;
}
return -1;
}
int32_t CFile::seek(long int offset, int32_t origin) {
int32_t ret = 0;
int64_t newPos = pos;
if (origin == SEEK_SET) {
newPos = offset;
} else if (origin == SEEK_CUR) {
newPos += offset;
} else if (origin == SEEK_END) {
newPos = filesize + offset;
}
if (newPos < 0) {
pos = 0;
} else {
pos = newPos;
}
if (iFd >= 0)
ret = ::lseek(iFd, pos, SEEK_SET);
if (mem_file != nullptr) {
if (pos > filesize) {
pos = filesize;
}
}
return ret;
}
int32_t CFile::fwrite(const char *format, ...) {
char tmp[512];
tmp[0] = 0;
int32_t result = -1;
va_list va;
va_start(va, format);
if ((vsprintf(tmp, format, va) >= 0)) {
result = this->write((uint8_t *) tmp, strlen(tmp));
}
va_end(va);
return result;
}