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Update mmap implementation

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Always map memory as writable, but private when read-only
This commit is contained in:
topjohnwu
2021-01-12 22:50:55 -08:00
parent 9a28dd4f6e
commit f2cb3c38fe
9 changed files with 58 additions and 73 deletions
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34
native/jni/init/raw_data.hpp
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@@ -2,31 +2,23 @@
#include <utils.hpp>
struct data_holder {
struct mmap_data {
uint8_t *buf = nullptr;
size_t sz = 0;
mmap_data() = default;
mmap_data(const mmap_data&) = delete;
mmap_data(mmap_data &&other) { consume(other); }
~mmap_data() { if (buf) munmap(buf, sz); }
mmap_data& operator=(mmap_data &&other) { consume(other); return *this; }
using str_pairs = std::initializer_list<std::pair<std::string_view, std::string_view>>;
int patch(str_pairs list);
bool contains(std::string_view pattern);
protected:
void consume(data_holder &other);
};
enum data_type { HEAP, MMAP };
template <data_type T>
struct auto_data : public data_holder {
auto_data<T>() = default;
auto_data<T>(const auto_data&) = delete;
auto_data<T>(auto_data<T> &&other) { consume(other); }
~auto_data<T>() {}
auto_data<T>& operator=(auto_data<T> &&other) { consume(other); return *this; }
};
template <> inline auto_data<MMAP>::~auto_data<MMAP>() { if (buf) munmap(buf, sz); }
template <> inline auto_data<HEAP>::~auto_data<HEAP>() { free(buf); }
static mmap_data rw(const char *name);
static mmap_data ro(const char *name);
namespace raw_data {
auto_data<HEAP> read(const char *name);
auto_data<HEAP> read(int fd);
auto_data<MMAP> mmap_rw(const char *name);
auto_data<MMAP> mmap_ro(const char *name);
}
private:
void consume(mmap_data &other);
};