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