0ad/source/lib/file/io/write_buffer.cpp
janwas a859562ea7 improvements and fixes:
- properly differentiate between buffer/offset alignment and length
alignment (relevant since block size has been increased to 256k)
- use VfsPath for most game paths instead of CStr
- clean up timer interface and implementation
- self-tests no longer crash
- file_cache.cpp: fix for the case where allocation fails (prevent
deleter from seeing a null pointer)
- allocators: move all shared_ptr-related stuff to its own component;
add DummySharedPtr
- codec: disable checksums (important for performance at work)
- File: made into an interface class to avoid export problems. not
entirely sure about this..
- vfs_path.h, path.h, os_path.h: proper fix for using
fs::change_extension and similar utility functions with derivatives of
basic_path
- lib_api: automatically link against import lib if building lib/ as a
DLL
- path_util: remove unused functions (this component is deprecated)
- compiler.h: add INLINE
- Xeromyces.cpp: pass PIVFS so that GetXMBPath works in self-test
(should do this mostly everywhere rather than have one singleton g_VFS)

This was SVN commit r5537.
2008-01-07 20:03:19 +00:00

102 lines
2.4 KiB
C++

#include "precompiled.h"
#include "write_buffer.h"
#include "lib/bits.h" // IsAligned
#include "lib/sysdep/cpu.h"
#include "io.h"
#include "io_internal.h"
WriteBuffer::WriteBuffer()
: m_capacity(4096), m_data(io_Allocate(m_capacity)), m_size(0)
{
}
void WriteBuffer::Append(const void* data, size_t size)
{
while(m_size + size > m_capacity)
m_capacity *= 2;
shared_ptr<u8> newData = io_Allocate(m_capacity);
cpu_memcpy(newData.get(), m_data.get(), m_size);
m_data = newData;
cpu_memcpy(m_data.get() + m_size, data, size);
m_size += size;
}
void WriteBuffer::Overwrite(const void* data, size_t size, size_t offset)
{
debug_assert(offset+size < m_size);
cpu_memcpy(m_data.get()+offset, data, size);
}
//-----------------------------------------------------------------------------
// UnalignedWriter
//-----------------------------------------------------------------------------
UnalignedWriter::UnalignedWriter(PIFile file, off_t ofs)
: m_file(file), m_alignedBuf(io_Allocate(BLOCK_SIZE))
{
const size_t misalignment = (size_t)ofs % SECTOR_SIZE;
m_alignedOfs = ofs - (off_t)misalignment;
if(misalignment)
io_ReadAligned(m_file, m_alignedOfs, m_alignedBuf.get(), BLOCK_SIZE);
m_bytesUsed = misalignment;
}
UnalignedWriter::~UnalignedWriter()
{
Flush();
}
LibError UnalignedWriter::Append(const u8* data, size_t size) const
{
while(size != 0)
{
// optimization: write directly from the input buffer, if possible
const size_t alignedSize = (size / BLOCK_SIZE) * BLOCK_SIZE;
if(m_bytesUsed == 0 && IsAligned(data, SECTOR_SIZE) && alignedSize != 0)
{
RETURN_ERR(io_WriteAligned(m_file, m_alignedOfs, data, alignedSize));
m_alignedOfs += (off_t)alignedSize;
data += alignedSize;
size -= alignedSize;
}
const size_t chunkSize = std::min(size, BLOCK_SIZE-m_bytesUsed);
cpu_memcpy(m_alignedBuf.get()+m_bytesUsed, data, chunkSize);
m_bytesUsed += chunkSize;
data += chunkSize;
size -= chunkSize;
if(m_bytesUsed == BLOCK_SIZE)
RETURN_ERR(WriteBlock());
}
return INFO::OK;
}
void UnalignedWriter::Flush() const
{
if(m_bytesUsed)
{
memset(m_alignedBuf.get()+m_bytesUsed, 0, BLOCK_SIZE-m_bytesUsed);
(void)WriteBlock();
}
}
LibError UnalignedWriter::WriteBlock() const
{
RETURN_ERR(io_WriteAligned(m_file, m_alignedOfs, m_alignedBuf.get(), BLOCK_SIZE));
m_alignedOfs += BLOCK_SIZE;
m_bytesUsed = 0;
return INFO::OK;
}