mirror of
https://github.com/RGBCube/serenity
synced 2025-10-28 07:12:07 +00:00
114 lines
2.8 KiB
C++
114 lines
2.8 KiB
C++
#include "FileHandle.h"
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#include "FileSystem.h"
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#include "CharacterDevice.h"
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#include "sys-errno.h"
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#include "UnixTypes.h"
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FileHandle::FileHandle(RetainPtr<VirtualFileSystem::Node>&& vnode)
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: m_vnode(move(vnode))
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{
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}
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FileHandle::~FileHandle()
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{
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}
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#ifndef SERENITY_KERNEL
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bool additionWouldOverflow(Unix::off_t a, Unix::off_t b)
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{
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ASSERT(a > 0);
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uint64_t ua = a;
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return (ua + b) > maxFileOffset;
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}
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#endif
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int FileHandle::stat(Unix::stat* buffer)
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{
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if (!m_vnode)
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return -EBADF;
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auto metadata = m_vnode->inode.metadata();
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if (!metadata.isValid())
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return -EIO;
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buffer->st_dev = 0; // FIXME
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buffer->st_ino = metadata.inode.index();
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buffer->st_mode = metadata.mode;
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buffer->st_nlink = metadata.linkCount;
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buffer->st_uid = metadata.uid;
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buffer->st_gid = metadata.gid;
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buffer->st_rdev = 0; // FIXME
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buffer->st_size = metadata.size;
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buffer->st_blksize = metadata.blockSize;
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buffer->st_blocks = metadata.blockCount;
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buffer->st_atime = metadata.atime;
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buffer->st_mtime = metadata.mtime;
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buffer->st_ctime = metadata.ctime;
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return 0;
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}
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Unix::off_t FileHandle::seek(Unix::off_t offset, int whence)
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{
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if (!m_vnode)
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return -EBADF;
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// FIXME: The file type should be cached on the vnode.
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// It's silly that we have to do a full metadata lookup here.
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auto metadata = m_vnode->inode.metadata();
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if (!metadata.isValid())
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return -EIO;
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if (metadata.isSocket() || metadata.isFIFO())
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return -ESPIPE;
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Unix::off_t newOffset;
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switch (whence) {
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case SEEK_SET:
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newOffset = offset;
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break;
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case SEEK_CUR:
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newOffset = m_currentOffset + offset;
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#ifndef SERENITY_KERNEL
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if (additionWouldOverflow(m_currentOffset, offset))
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return -EOVERFLOW;
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#endif
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if (newOffset < 0)
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return -EINVAL;
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break;
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case SEEK_END:
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// FIXME: Implement!
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notImplemented();
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newOffset = 0;
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break;
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default:
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return -EINVAL;
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}
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m_currentOffset = newOffset;
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return m_currentOffset;
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}
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Unix::ssize_t FileHandle::read(byte* buffer, Unix::size_t count)
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{
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if (m_vnode->isCharacterDevice()) {
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// FIXME: What should happen to m_currentOffset?
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return m_vnode->characterDevice()->read(buffer, count);
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}
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Unix::ssize_t nread = m_vnode->fileSystem()->readInodeBytes(m_vnode->inode, m_currentOffset, count, buffer);
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m_currentOffset += nread;
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return nread;
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}
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ByteBuffer FileHandle::readEntireFile()
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{
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if (m_vnode->isCharacterDevice()) {
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auto buffer = ByteBuffer::createUninitialized(1024);
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Unix::ssize_t nread = m_vnode->characterDevice()->read(buffer.pointer(), buffer.size());
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buffer.trim(nread);
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return buffer;
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}
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return m_vnode->fileSystem()->readEntireInode(m_vnode->inode);
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}
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