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Allow loading of huge files efficiently

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WerWolv
2020-11-22 19:43:35 +01:00
parent 5f025bcbcc
commit 43f5cc622e
8 changed files with 121 additions and 63 deletions
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2
include/providers/file_provider.hpp
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@@ -19,7 +19,7 @@ namespace hex::prv {
void read(u64 offset, void *buffer, size_t size) override;
void write(u64 offset, void *buffer, size_t size) override;
size_t getSize() override;
size_t getActualSize() override;
std::vector<std::pair<std::string, std::string>> getDataInformation() override;

20
include/providers/provider.hpp
View File

@@ -2,6 +2,7 @@
#include <hex.hpp>
#include <cmath>
#include <string>
#include <vector>
@@ -9,6 +10,8 @@ namespace hex::prv {
class Provider {
public:
constexpr static size_t PageSize = 0x1000'0000;
Provider() = default;
virtual ~Provider() = default;
@@ -18,9 +21,24 @@ namespace hex::prv {
virtual void read(u64 offset, void *buffer, size_t size) = 0;
virtual void write(u64 offset, void *buffer, size_t size) = 0;
virtual size_t getSize() = 0;
virtual size_t getActualSize() = 0;
u32 getPageCount() { return std::ceil(this->getActualSize() / double(PageSize)); }
u32 getCurrentPage() const { return this->m_currPage; }
void setCurrentPage(u32 page) { if (page < getPageCount()) this->m_currPage = page; }
virtual size_t getBaseAddress() {
return PageSize * this->m_currPage;
}
virtual size_t getSize() {
return std::min(this->getActualSize() - PageSize * this->m_currPage, PageSize);
}
virtual std::vector<std::pair<std::string, std::string>> getDataInformation() = 0;
protected:
u32 m_currPage = 0;
};
}