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LibCore: Support HTTP disk caching on Windows

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This implements Core::System::transfer_file_through_pipe for Windows
(which is actually a socket, not a pipe). This let's us enable the
HTTP disk cache.
This commit is contained in:
Timothy Flynn 2025-12-01 07:12:16 -05:00 • committed by Tim Flynn
parent 079a2ba36a
commit edac716e91
Notes: github-actions[bot] 2025-12-01 13:56:34 +00:00
1 changed files with 18 additions and 5 deletions
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23
Libraries/LibCore/SystemWindows.cpp
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@ -404,12 +404,25 @@ ErrorOr<void> kill(pid_t pid, int signal)
ErrorOr<size_t> transfer_file_through_pipe(int source_fd, int target_fd, size_t source_offset, size_t source_length)
{
(void)source_fd;
(void)target_fd;
(void)source_offset;
(void)source_length;
// FIXME: We could use TransmitFile (https://learn.microsoft.com/en-us/windows/win32/api/mswsock/nf-mswsock-transmitfile)
// here. But in order to transmit a subset of the file, we have to use overlapped IO.
return Error::from_string_literal("FIXME: Implement System::transfer_file_through_pipe on Windows (for HTTP disk cache)");
static auto allocation_granularity = []() {
SYSTEM_INFO system_info {};
GetSystemInfo(&system_info);
return system_info.dwAllocationGranularity;
}();
// MapViewOfFile requires the offset to be aligned to the system allocation granularity, so we must handle that here.
auto aligned_source_offset = (source_offset / allocation_granularity) * allocation_granularity;
auto offset_adjustment = source_offset - aligned_source_offset;
auto mapped_source_length = source_length + offset_adjustment;
auto* mapped = TRY(mmap(nullptr, mapped_source_length, PROT_READ, MAP_SHARED, source_fd, aligned_source_offset));
ScopeGuard guard { [&]() { (void)munmap(mapped, mapped_source_length); } };
return TRY(send(target_fd, { static_cast<u8*>(mapped) + offset_adjustment, source_length }, 0));
}
}