mirror of https://github.com/odrling/Aegisub
120 lines
3.7 KiB
C++
120 lines
3.7 KiB
C++
// Copyright (c) 2014, Thomas Goyne <plorkyeran@aegisub.org>
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//
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// Permission to use, copy, modify, and distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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//
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// Aegisub Project http://www.aegisub.org/
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#include "../config.h"
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#include "libaegisub/file_mapping.h"
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#include "libaegisub/fs.h"
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#include "libaegisub/util.h"
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#include <boost/filesystem.hpp>
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#include <boost/interprocess/mapped_region.hpp>
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#include <limits>
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#ifdef _WIN32
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#include <Windows.h>
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#endif
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using namespace boost::interprocess;
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namespace agi {
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file_mapping::file_mapping(agi::fs::path const& filename, boost::interprocess::mode_t mode)
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#ifdef _WIN32
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: handle(CreateFileW(filename.wstring().c_str(), (unsigned int)mode, FILE_SHARE_READ, nullptr, OPEN_EXISTING, 0, 0))
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{
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if (handle == ipcdetail::invalid_file()) {
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switch (GetLastError()) {
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case ERROR_FILE_NOT_FOUND:
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case ERROR_PATH_NOT_FOUND:
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throw fs::FileNotFound(filename);
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case ERROR_ACCESS_DENIED:
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throw fs::ReadDenied(filename);
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default:
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throw fs::FileSystemUnknownError(util::ErrorString(GetLastError()));
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}
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}
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#else
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: handle(ipcdetail::open_existing_file(filename.string().c_str(), mode))
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{
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if (handle == ipcdetail::invalid_file()) {
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switch (errno) {
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case ENOENT:
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throw fs::FileNotFound(filename);
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case EACCES:
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throw fs::ReadDenied(filename);
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case EIO:
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throw fs::FileSystemUnknownError("Fatal I/O opening path: " + filename.string());
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}
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}
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#endif
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}
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file_mapping::~file_mapping() {
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if (handle != ipcdetail::invalid_file()) {
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ipcdetail::close_file(handle);
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}
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}
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read_file_mapping::read_file_mapping(fs::path const& filename)
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: file(filename, read_only)
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{
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offset_t size;
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ipcdetail::get_file_size(file.get_mapping_handle().handle, size);
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file_size = static_cast<uint64_t>(size);
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}
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read_file_mapping::~read_file_mapping() { }
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const char *read_file_mapping::read() {
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return read(0, size());
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}
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const char *read_file_mapping::read(int64_t s_offset, uint64_t length) {
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auto offset = static_cast<uint64_t>(s_offset);
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if (offset + length > file_size)
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throw InternalError("Attempted to map beyond end of file", nullptr);
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// Check if we can just use the current mapping
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if (region && offset >= mapping_start && offset + length <= mapping_start + region->get_size())
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return static_cast<char *>(region->get_address()) + offset - mapping_start;
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if (sizeof(size_t) == 4) {
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mapping_start = offset & ~0xFFFFFULL; // Align to 1 MB bondary
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length += static_cast<size_t>(offset - mapping_start);
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// Map 16 MB or length rounded up to the next MB
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length = std::min<uint64_t>(std::max<uint64_t>(0x1000000U, (length + 0xFFFFF) & ~0xFFFFF), file_size - mapping_start);
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}
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else {
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// Just map the whole file
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mapping_start = 0;
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length = file_size;
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}
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if (length > std::numeric_limits<size_t>::max())
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throw std::bad_alloc();
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try {
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region = agi::util::make_unique<mapped_region>(file, read_only, mapping_start, static_cast<size_t>(length));
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}
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catch (interprocess_exception const&) {
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throw fs::FileSystemUnknownError("Failed mapping a view of the file");
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}
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return static_cast<char *>(region->get_address()) + offset - mapping_start;
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}
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}
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