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Implement backing modes

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These are used to determine the capabilities of a backing.
This commit is contained in:
Billy Laws 2020-06-26 11:04:54 +01:00 committed by ◱ PixelyIon
parent b94248cec0
commit 26025d9adf
3 changed files with 24 additions and 3 deletions
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17
app/src/main/cpp/skyline/vfs/backing.h
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@ -11,12 +11,27 @@ namespace skyline::vfs {
*/ */
class Backing { class Backing {
public: public:
/**
* @brief This describes the modes that a backing is capable of
*/
union Mode {
struct {
bool read : 1; //!< The backing is readable
bool write : 1; //!< The backing is writable
bool append : 1; //!< The backing can be appended
};
u32 raw; //!< The raw value of the mode
};
static_assert(sizeof(Mode) == 0x4);
Mode mode; //!< The mode of the backing
size_t size; //!< The size of the backing in bytes size_t size; //!< The size of the backing in bytes
/** /**
* @param mode The mode to use for the backing
* @param size The initial size of the backing * @param size The initial size of the backing
*/ */
Backing(size_t size = 0) : size(size) {} Backing(Mode mode = {true, false, false}, size_t size = 0) : mode(mode), size(size) {}
/* Delete the move constructor to prevent multiple instances of the same backing */ /* Delete the move constructor to prevent multiple instances of the same backing */
Backing(const Backing &) = delete; Backing(const Backing &) = delete;

5
app/src/main/cpp/skyline/vfs/os_backing.cpp
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@ -7,7 +7,7 @@
#include "os_backing.h" #include "os_backing.h"
namespace skyline::vfs { namespace skyline::vfs {
OsBacking::OsBacking(int fd) : fd(fd) { OsBacking::OsBacking(int fd) : Backing(), fd(fd) {
struct stat fileInfo; struct stat fileInfo;
if (fstat(fd, &fileInfo)) if (fstat(fd, &fileInfo))
@ -17,6 +17,9 @@ namespace skyline::vfs {
} }
size_t OsBacking::Read(u8 *output, size_t offset, size_t size) { size_t OsBacking::Read(u8 *output, size_t offset, size_t size) {
if (!mode.read)
throw exception("Attempting to read a backing that is not readable");
auto ret = pread64(fd, output, size, offset); auto ret = pread64(fd, output, size, offset);
if (ret < 0) if (ret < 0)

5
app/src/main/cpp/skyline/vfs/region_backing.h
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@ -20,9 +20,12 @@ namespace skyline::vfs {
* @param offset The offset of the region start within the parent backing * @param offset The offset of the region start within the parent backing
* @param size The size of the region in the parent backing * @param size The size of the region in the parent backing
*/ */
RegionBacking(const std::shared_ptr<vfs::Backing> &backing, size_t offset, size_t size) : Backing(size), backing(backing), offset(offset) {}; RegionBacking(const std::shared_ptr<vfs::Backing> &backing, size_t offset, size_t size, Mode mode = {true, false, false}) : Backing(mode, size), backing(backing), offset(offset) {};
inline size_t Read(u8 *output, size_t offset, size_t size) { inline size_t Read(u8 *output, size_t offset, size_t size) {
if (!mode.read)
throw exception("Attempting to read a backing that is not readable");
size = std::min(offset + size, this->size) - offset; size = std::min(offset + size, this->size) - offset;
return backing->Read(output, this->offset + offset, size); return backing->Read(output, this->offset + offset, size);