77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
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#pragma once
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#include <optional>
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#include <string.h>
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extern "C"
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{
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#include <3ds/result.h>
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#include <3ds/services/fs.h>
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#include <3ds/svc.h>
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#include <3ds/types.h>
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}
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namespace util
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{
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inline FS_Path MakePath(const char *path)
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{
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return {PATH_ASCII, strnlen(path, 255) + 1, path};
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}
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// A small wrapper to make forgetting to close a file and
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// to check read lengths impossible.
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class File
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{
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public:
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File() = default;
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File(const File &other) = delete;
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File &operator=(const File &) = delete;
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File(File &&other) { *this = std::move(other); }
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File &operator=(File &&other)
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{
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std::swap(m_handle, other.m_handle);
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return *this;
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}
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~File() { Close(); }
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bool Close()
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{
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const bool ok = !m_handle || R_SUCCEEDED(FSFILE_Close(*m_handle));
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if(ok)
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m_handle = std::nullopt;
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return ok;
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}
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bool Open(const char *path, int open_flags)
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{
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const FS_Path archive_path = {PATH_EMPTY, 1, ""};
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Handle handle;
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const bool ok = R_SUCCEEDED(FSUSER_OpenFileDirectly(&handle, ARCHIVE_SDMC, archive_path,
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MakePath(path), open_flags, 0));
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if(ok)
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m_handle = handle;
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return ok;
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}
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bool Read(void *buffer, u32 size, u64 offset)
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{
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u32 bytes_read = 0;
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const Result res = FSFILE_Read(*m_handle, &bytes_read, offset, buffer, size);
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return R_SUCCEEDED(res) && bytes_read == size;
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}
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std::optional<u64> GetSize() const
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{
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u64 size;
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if(!R_SUCCEEDED(FSFILE_GetSize(*m_handle, &size)))
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return std::nullopt;
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return size;
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}
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private:
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std::optional<Handle> m_handle;
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};
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} // namespace util
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