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fs: implement file::read_at

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Reads from the given offset; does not seek; thread-safe.
This commit is contained in:
Nekotekina 2022-12-24 17:15:29 +03:00 • committed by Ivan
parent 9d432187aa
commit 2f9cac8d18
5 changed files with 156 additions and 15 deletions
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30
Utilities/File.h
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@ -93,6 +93,7 @@ namespace fs
virtual void sync();
virtual bool trunc(u64 length) = 0;
virtual u64 read(void* buffer, u64 size) = 0;
virtual u64 read_at(u64 offset, void* buffer, u64 size) = 0;
virtual u64 write(const void* buffer, u64 size) = 0;
virtual u64 seek(s64 offset, seek_mode whence) = 0;
virtual u64 size() = 0;
@ -301,6 +302,17 @@ namespace fs
return m_file->read(buffer, count);
}
// Read the data from the file at specified offset in thread-safe manner
u64 read_at(u64 offset, void* buffer, u64 count,
u32 line = __builtin_LINE(),
u32 col = __builtin_COLUMN(),
const char* file = __builtin_FILE(),
const char* func = __builtin_FUNCTION()) const
{
if (!m_file) xnull({line, col, file, func});
return m_file->read_at(offset, buffer, count);
}
// Write the data to the file and return the amount of data actually written
u64 write(const void* buffer, u64 count,
u32 line = __builtin_LINE(),
@ -724,6 +736,24 @@ namespace fs
return 0;
}
u64 read_at(u64 offset, void* buffer, u64 size) override
{
const u64 end = obj.size();
if (offset < end)
{
// Get readable size
if (const u64 max = std::min<u64>(size, end - offset))
{
std::copy(obj.cbegin() + offset, obj.cbegin() + offset + max, static_cast<value_type*>(buffer));
update_time();
return max;
}
}
return 0;
}
u64 write(const void* buffer, u64 size) override
{
const u64 old_size = obj.size();