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97 lines
2.3 KiB
97 lines
2.3 KiB
#include "storm/storm_sdl_rw.h" |
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#include <cstdint> |
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#include <cstring> |
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#include "engine.h" |
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#include "storm/storm.h" |
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namespace devilution { |
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static HANDLE SFileRwGetHandle(struct SDL_RWops *context) |
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{ |
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return (HANDLE)context->hidden.unknown.data1; |
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} |
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static void SFileRwSetHandle(struct SDL_RWops *context, HANDLE handle) |
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{ |
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context->hidden.unknown.data1 = handle; |
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} |
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#ifndef USE_SDL1 |
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static Sint64 SFileRwSize(struct SDL_RWops *context) |
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{ |
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return SFileGetFileSize(SFileRwGetHandle(context), nullptr); |
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} |
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#endif |
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#ifndef USE_SDL1 |
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static Sint64 SFileRwSeek(struct SDL_RWops *context, Sint64 offset, int whence) |
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#else |
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static int SFileRw_seek(struct SDL_RWops *context, int offset, int whence) |
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#endif |
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{ |
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DWORD swhence; |
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switch (whence) { |
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case RW_SEEK_SET: |
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swhence = DVL_FILE_BEGIN; |
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break; |
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case RW_SEEK_CUR: |
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swhence = DVL_FILE_CURRENT; |
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break; |
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case RW_SEEK_END: |
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swhence = DVL_FILE_END; |
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break; |
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default: |
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return -1; |
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} |
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const std::uint64_t pos = SFileSetFilePointer(SFileRwGetHandle(context), offset, swhence); |
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if (pos == static_cast<std::uint64_t>(-1)) { |
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SDL_Log("SFileRw_seek error: %ud", (unsigned int)SErrGetLastError()); |
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} |
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return pos; |
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} |
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#ifndef USE_SDL1 |
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static size_t SFileRwRead(struct SDL_RWops *context, void *ptr, size_t size, size_t maxnum) |
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#else |
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static int SFileRw_read(struct SDL_RWops *context, void *ptr, int size, int maxnum) |
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#endif |
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{ |
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DWORD numRead = 0; |
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if (!SFileReadFile(SFileRwGetHandle(context), ptr, maxnum * size, &numRead, nullptr)) { |
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const DWORD errCode = SErrGetLastError(); |
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if (errCode != STORM_ERROR_HANDLE_EOF) { |
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SDL_Log("SFileRw_read error: %u %u ERROR CODE %u", (unsigned int)size, (unsigned int)maxnum, (unsigned int)errCode); |
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} |
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} |
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return numRead / size; |
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} |
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static int SFileRwClose(struct SDL_RWops *context) |
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{ |
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mem_free_dbg(context); |
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return 0; |
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} |
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SDL_RWops *SFileRw_FromStormHandle(HANDLE handle) |
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{ |
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SDL_RWops *result = (SDL_RWops *)DiabloAllocPtr(sizeof(SDL_RWops)); |
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std::memset(result, 0, sizeof(*result)); |
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#ifndef USE_SDL1 |
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result->size = &SFileRwSize; |
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result->type = SDL_RWOPS_UNKNOWN; |
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#else |
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result->type = 0; |
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#endif |
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result->seek = &SFileRwSeek; |
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result->read = &SFileRwRead; |
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result->write = nullptr; |
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result->close = &SFileRwClose; |
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SFileRwSetHandle(result, handle); |
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return result; |
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} |
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} // namespace devilution
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