128 lines
3.4 KiB
C++
128 lines
3.4 KiB
C++
//===-- FileCache.cpp -------------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Host/FileCache.h"
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#include "lldb/Host/File.h"
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using namespace lldb;
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using namespace lldb_private;
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FileCache *FileCache::m_instance = nullptr;
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FileCache &
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FileCache::GetInstance()
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{
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if (m_instance == nullptr)
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m_instance = new FileCache();
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return *m_instance;
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}
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lldb::user_id_t
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FileCache::OpenFile(const FileSpec &file_spec, uint32_t flags, uint32_t mode, Error &error)
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{
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std::string path(file_spec.GetPath());
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if (path.empty())
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{
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error.SetErrorString("empty path");
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return UINT64_MAX;
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}
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FileSP file_sp(new File());
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error = file_sp->Open(path.c_str(), flags, mode);
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if (file_sp->IsValid() == false)
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return UINT64_MAX;
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lldb::user_id_t fd = file_sp->GetDescriptor();
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m_cache[fd] = file_sp;
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return fd;
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}
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bool
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FileCache::CloseFile(lldb::user_id_t fd, Error &error)
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{
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if (fd == UINT64_MAX)
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{
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error.SetErrorString("invalid file descriptor");
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return false;
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}
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FDToFileMap::iterator pos = m_cache.find(fd);
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if (pos == m_cache.end())
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{
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error.SetErrorStringWithFormat("invalid host file descriptor %" PRIu64, fd);
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return false;
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}
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FileSP file_sp = pos->second;
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if (!file_sp)
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{
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error.SetErrorString("invalid host backing file");
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return false;
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}
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error = file_sp->Close();
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m_cache.erase(pos);
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return error.Success();
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}
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uint64_t
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FileCache::WriteFile(lldb::user_id_t fd, uint64_t offset, const void *src, uint64_t src_len, Error &error)
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{
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if (fd == UINT64_MAX)
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{
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error.SetErrorString("invalid file descriptor");
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return UINT64_MAX;
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}
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FDToFileMap::iterator pos = m_cache.find(fd);
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if (pos == m_cache.end())
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{
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error.SetErrorStringWithFormat("invalid host file descriptor %" PRIu64, fd);
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return false;
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}
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FileSP file_sp = pos->second;
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if (!file_sp)
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{
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error.SetErrorString("invalid host backing file");
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return UINT64_MAX;
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}
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if (static_cast<uint64_t>(file_sp->SeekFromStart(offset, &error)) != offset || error.Fail())
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return UINT64_MAX;
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size_t bytes_written = src_len;
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error = file_sp->Write(src, bytes_written);
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if (error.Fail())
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return UINT64_MAX;
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return bytes_written;
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}
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uint64_t
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FileCache::ReadFile(lldb::user_id_t fd, uint64_t offset, void *dst, uint64_t dst_len, Error &error)
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{
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if (fd == UINT64_MAX)
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{
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error.SetErrorString("invalid file descriptor");
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return UINT64_MAX;
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}
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FDToFileMap::iterator pos = m_cache.find(fd);
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if (pos == m_cache.end())
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{
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error.SetErrorStringWithFormat("invalid host file descriptor %" PRIu64, fd);
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return false;
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}
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FileSP file_sp = pos->second;
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if (!file_sp)
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{
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error.SetErrorString("invalid host backing file");
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return UINT64_MAX;
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}
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if (static_cast<uint64_t>(file_sp->SeekFromStart(offset, &error)) != offset || error.Fail())
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return UINT64_MAX;
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size_t bytes_read = dst_len;
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error = file_sp->Read(dst, bytes_read);
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if (error.Fail())
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return UINT64_MAX;
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return bytes_read;
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}
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