本文整理汇总了C++中fs::file::pos方法的典型用法代码示例。如果您正苦于以下问题：C++ file::pos方法的具体用法？C++ file::pos怎么用？C++ file::pos使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类fs::file的用法示例。
在下文中一共展示了file::pos方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: pkg_install
bool pkg_install(const fs::file& pkg_f, const std::string& dir, atomic_t<double>& sync, const std::string& pkg_filepath)
{
const std::size_t BUF_SIZE = 8192 * 1024; // 8 MB
std::vector<fs::file> filelist;
u32 cur_file=0;
fs::file original_file(pkg_filepath);
original_file.seek(pkg_f.pos());
filelist.push_back(std::move(original_file));
// Save current file offset (probably zero)
const u64 start_offset = pkg_f.pos();
u64 cur_offset = start_offset;
u64 cur_file_offset = start_offset;
// Get basic PKG information
PKGHeader header;
auto archive_seek = [&](const s64 new_offset, const fs::seek_mode damode = fs::seek_set)
{
if(damode == fs::seek_set) cur_offset = new_offset;
else if (damode == fs::seek_cur) cur_offset += new_offset;
u64 _offset = 0;
for (u32 i = 0; i < filelist.size(); i++)
{
if (cur_offset < (_offset + filelist[i].size()))
{
cur_file = i;
cur_file_offset = cur_offset - _offset;
filelist[i].seek(cur_file_offset);
break;
}
_offset += filelist[i].size();
}
};
auto archive_read = [&](const void *data_ptr, const u64 num_bytes)
{
u64 num_bytes_left = filelist[cur_file].size() - cur_file_offset;
//check if it continues in another file
if (num_bytes > num_bytes_left)
{
filelist[cur_file].read((u8 *)data_ptr, num_bytes_left);
if ((cur_file + 1) < filelist.size()) cur_file++;
else
{
cur_offset += num_bytes_left;
cur_file_offset = filelist[cur_file].size();
return num_bytes_left;
}
u64 num_read = filelist[cur_file].read((u8 *)data_ptr + num_bytes_left, num_bytes - num_bytes_left);
cur_offset += (num_read + num_bytes_left);
cur_file_offset = num_read;
return (num_read+num_bytes_left);
}
u64 num_read = filelist[cur_file].read((u8 *)data_ptr, num_bytes);
cur_offset += num_read;
cur_file_offset += num_read;
return num_read;
};
if (archive_read(&header, sizeof(header)) != sizeof(header))
{
LOG_ERROR(LOADER, "PKG file is too short!");
return false;
}
if (header.pkg_magic != "\x7FPKG"_u32)
{
LOG_ERROR(LOADER, "Not a PKG file!");
return false;
}
switch (const u16 type = header.pkg_type)
{
case PKG_RELEASE_TYPE_DEBUG: break;
case PKG_RELEASE_TYPE_RELEASE: break;
default:
{
LOG_ERROR(LOADER, "Unknown PKG type (0x%x)", type);
return false;
}
}
switch (const u16 platform = header.pkg_platform)
{
case PKG_PLATFORM_TYPE_PS3: break;
case PKG_PLATFORM_TYPE_PSP: break;
default:
{
LOG_ERROR(LOADER, "Unknown PKG platform (0x%x)", platform);
return false;
}
}
//.........这里部分代码省略.........