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// Copyright 2015 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdio.h>
#include <windows.h>
#include <string>
#include "src/main/cpp/util/errors.h"
#include "src/main/cpp/util/file_platform.h"
#include "third_party/ijar/mapped_file.h"
#define MAX_ERROR 2048
namespace devtools_ijar {
using std::wstring;
static char errmsg[MAX_ERROR] = "";
struct MappedInputFileImpl {
HANDLE file_;
HANDLE mapping_;
MappedInputFileImpl(HANDLE file, HANDLE mapping) {
file_ = file;
mapping_ = mapping;
}
};
MappedInputFile::MappedInputFile(const char* name) {
impl_ = NULL;
opened_ = false;
errmsg_ = errmsg;
wstring wname;
if (!blaze_util::AsAbsoluteWindowsPath(name, &wname)) {
blaze_util::die(255,
"MappedInputFile(%s): AsAbsoluteWindowsPath failed: %s",
name, blaze_util::GetLastErrorString().c_str());
}
HANDLE file = CreateFileW(wname.c_str(), GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_EXISTING, 0, NULL);
if (file == INVALID_HANDLE_VALUE) {
blaze_util::die(255, "MappedInputFile(%s): CreateFileW(%S) failed: %s",
name, wname.c_str(),
blaze_util::GetLastErrorString().c_str());
}
LARGE_INTEGER size;
if (!GetFileSizeEx(file, &size)) {
blaze_util::die(255, "MappedInputFile(%s): GetFileSizeEx failed: %s", name,
blaze_util::GetLastErrorString().c_str());
}
HANDLE mapping = CreateFileMapping(file, NULL, PAGE_READONLY,
size.HighPart, size.LowPart, NULL);
if (mapping == NULL || mapping == INVALID_HANDLE_VALUE) {
blaze_util::die(255, "MappedInputFile(%s): CreateFileMapping failed: %s",
name),
blaze_util::GetLastErrorString().c_str();
}
void *view = MapViewOfFileEx(mapping, FILE_MAP_READ, 0, 0, 0, NULL);
if (view == NULL) {
blaze_util::die(255, "MappedInputFile(%s): MapViewOfFileEx failed: %s",
name, blaze_util::GetLastErrorString().c_str());
}
impl_ = new MappedInputFileImpl(file, mapping);
length_ = size.QuadPart;
buffer_ = reinterpret_cast<u1*>(view);
opened_ = true;
}
MappedInputFile::~MappedInputFile() {
delete impl_;
}
void MappedInputFile::Discard(size_t bytes) {
// This is not supported on Windows for now. I'm not sure if we can unmap
// parts of an existing view and that this is necessary for Windows at all.
// At any rate, this only matters for >2GB (or maybe >4GB?) input files.
}
int MappedInputFile::Close() {
if (!UnmapViewOfFile(buffer_)) {
blaze_util::die(255, "MappedInputFile::Close: UnmapViewOfFile failed: %s",
blaze_util::GetLastErrorString().c_str());
}
if (!CloseHandle(impl_->mapping_)) {
blaze_util::die(
255, "MappedInputFile::Close: CloseHandle for mapping failed: %s",
blaze_util::GetLastErrorString().c_str());
}
if (!CloseHandle(impl_->file_)) {
blaze_util::die(255,
"MappedInputFile::Close: CloseHandle for file failed: %s",
blaze_util::GetLastErrorString().c_str());
}
return 0;
}
struct MappedOutputFileImpl {
HANDLE file_;
HANDLE mapping_;
MappedOutputFileImpl(HANDLE file, HANDLE mapping) {
file_ = file;
mapping_ = mapping;
}
};
MappedOutputFile::MappedOutputFile(const char* name, size_t estimated_size) {
impl_ = NULL;
opened_ = false;
errmsg_ = errmsg;
wstring wname;
if (!blaze_util::AsAbsoluteWindowsPath(name, &wname)) {
blaze_util::die(255,
"MappedOutputFile(%s): AsAbsoluteWindowsPath failed: %s",
name, blaze_util::GetLastErrorString().c_str());
}
HANDLE file = CreateFileW(wname.c_str(), GENERIC_READ | GENERIC_WRITE, 0,
NULL, CREATE_ALWAYS, 0, NULL);
if (file == INVALID_HANDLE_VALUE) {
blaze_util::die(255, "MappedOutputFile(%s): CreateFileW(%S) failed: %s",
name, wname.c_str(),
blaze_util::GetLastErrorString().c_str());
}
HANDLE mapping = CreateFileMapping(file, NULL, PAGE_READWRITE,
estimated_size >> 32, estimated_size & 0xffffffffUL, NULL);
if (mapping == NULL || mapping == INVALID_HANDLE_VALUE) {
blaze_util::die(255, "MappedOutputFile(%s): CreateFileMapping failed: %s",
name);
}
void *view = MapViewOfFileEx(mapping, FILE_MAP_ALL_ACCESS, 0, 0, 0, NULL);
if (view == NULL) {
blaze_util::die(255, "MappedOutputFile(%s): MapViewOfFileEx failed: %s",
name, blaze_util::GetLastErrorString().c_str());
CloseHandle(mapping);
CloseHandle(file);
return;
}
impl_ = new MappedOutputFileImpl(file, mapping);
buffer_ = reinterpret_cast<u1*>(view);
opened_ = true;
}
MappedOutputFile::~MappedOutputFile() {
delete impl_;
}
int MappedOutputFile::Close(size_t size) {
if (!UnmapViewOfFile(buffer_)) {
blaze_util::die(255, "MappedOutputFile::Close: UnmapViewOfFile failed: %s",
blaze_util::GetLastErrorString().c_str());
}
if (!CloseHandle(impl_->mapping_)) {
blaze_util::die(
255, "MappedOutputFile::Close: CloseHandle for mapping failed: %s",
blaze_util::GetLastErrorString().c_str());
}
if (!SetFilePointer(impl_->file_, size, NULL, FILE_BEGIN)) {
blaze_util::die(255, "MappedOutputFile::Close: SetFilePointer failed: %s",
blaze_util::GetLastErrorString().c_str());
}
if (!SetEndOfFile(impl_->file_)) {
blaze_util::die(255, "MappedOutputFile::Close: SetEndOfFile failed: %s",
blaze_util::GetLastErrorString().c_str());
}
if (!CloseHandle(impl_->file_)) {
blaze_util::die(255,
"MappedOutputFile::Close: CloseHandle for file failed: %s",
blaze_util::GetLastErrorString().c_str());
}
return 0;
}
} // namespace devtools_ijar
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