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#ifndef DATA_H
#define DATA_H
#include <stdexcept>
#include <windows.h>
#include <libxml/xmlerror.h>
#include "util.h"
#include "win.h"
struct XmlError : public std::exception
{
const char* msg;
inline XmlError()
{
msg = xmlGetLastError()->message;
}
inline virtual const char* what() const noexcept
{
return msg;
}
};
/* Fetch data from the web. */
void FetchData(unsigned char* sig);
void FetchScreenwriters(unsigned char* sig);
/* Wait for thread. */
void WaitFor(void (*f)(unsigned char*));
/* The structs ending with A are written as-is to disk. As such, they
* should be regarded as immutable. If the format needs to be changed
* in the future, then new structs ending with B should be added. */
/* Note that unsigned chars are 1-byte-aligned, shorts and wchar_t are
* 2-byte-aligned and ints are 4-byte-aligned (on x86 Windows). */
/* Basic episode data presented in episode list view. */
struct ElvDataA
{
unsigned char version = 'a';
unsigned char rating = 0;
unsigned char bWatched = 0;
unsigned char bTVOriginal = 0;
wchar_t sRating[4] = {0};
wchar_t siEp[6] = {0};
wchar_t title[128] = {0};
};
/* Extra episode data presented in data list view. */
struct DlvDataA
{
unsigned char version = 'a';
unsigned char pad[3] = {0};
wchar_t date[32] = {0};
wchar_t source[48] = {0};
wchar_t screenwriter[48] = {0};
wchar_t hint[128] = {0};
wchar_t wiki[192] = {0};
};
/* Configuration. */
struct CfgA
{
unsigned char version = 'a';
unsigned char bViewWatched = 1;
unsigned char bViewTVOriginal = 1;
signed char iSortCol = 1;
unsigned short cEp = 4096;
unsigned short iFocus = 0;
unsigned short heightDlv = 0;
wchar_t limitToScreenwriter[48] = {0};
wchar_t root[260] = {0};
wchar_t glob[64] = {0};
wchar_t url[192] = {0};
};
/* Variable template for obtaining the version of a given struct. */
template <typename T>
constexpr inline unsigned char Version = T().version;
template <typename T, typename = int>
constexpr inline bool HasVersion = false;
template <typename T>
constexpr inline bool HasVersion<T, decltype((void) T::version, 0)> = true;
inline void FreeView(void* view)
{
FlushViewOfFile(view, 0);
UnmapViewOfFile(view);
}
/* FileView objects manage a memory-mapped file. The view buffer may
* be treated as an array of a given type T. Note that reading and
* writing a view can throw structured exceptions. We ignore these. */
template <typename T>
struct FileView
{
Unique<HANDLE, CloseHandle> hf;
Unique<HANDLE, CloseHandle> hm;
Unique<T*, FreeView> view;
size_t c;
static FileView Initialized(const wchar_t* filename, size_t c, size_t cInit = 0)
{
/* If file didn't exist, initialize it with defaults. */
if (cInit && GetFileAttributes(filename) == INVALID_FILE_ATTRIBUTES) {
FileView fv(filename, c);
T t;
cInit = cInit? cInit: c;
for (size_t i = 0; i < cInit; i++)
memcpy(fv+i, &t, sizeof(T));
return fv;
} else
return {filename, c};
}
FileView(const wchar_t* filename, size_t c) : c(c)
{
hf = CreateFile(filename, GENERIC_READ|GENERIC_WRITE,
0, nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
if (!hf.Bad(INVALID_HANDLE_VALUE)) {
if (GetLastError() == ERROR_FILE_NOT_FOUND) {
hf = CreateFile(filename, GENERIC_READ|GENERIC_WRITE,
0, nullptr, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, nullptr);
if (!hf.Bad(INVALID_HANDLE_VALUE))
throw Win32Error();
} else
throw Win32Error();
}
LARGE_INTEGER cbMap;
cbMap.QuadPart = c*sizeof(T);
hm = CreateFileMapping(hf.v, nullptr, PAGE_READWRITE,
cbMap.HighPart, cbMap.LowPart, nullptr);
if (!hm.Bad(0))
throw Win32Error();
view = reinterpret_cast<T*>(MapViewOfFile(hm.v, FILE_MAP_ALL_ACCESS, 0, 0, 0));
if (!view.Bad(0))
throw Win32Error();
}
/* Access element by index, performing bounds check and, if
* applicable for T, version validation as well as
* initialization, if needed. */
T& At(size_t i)
{
if (i >= c)
throw std::out_of_range("index larger than buffer");
T& t = view.v[i];
if constexpr (HasVersion<T>) {
if (t.version == 0) {
T t_;
memcpy(&t, &t_, sizeof(T));
} else if (t.version != Version<T>)
throw std::runtime_error("invalid struct version");
}
/* TODO: Use a custom exception type that informs the
* user of possible data corruption. */
return t;
}
T* begin() noexcept { return *view; }
T* end() noexcept { return view[c-1]; }
inline operator T*() noexcept
{
return view.v;
}
inline T* operator ->() noexcept
{
return view.v;
}
};
#endif
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