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#include "util/stream/io.hh"
#include "util/file.hh"
#include "util/stream/chain.hh"
#include <cstddef>
namespace util {
namespace stream {
ReadSizeException::ReadSizeException() throw() {}
ReadSizeException::~ReadSizeException() throw() {}
void Read::Run(const ChainPosition &position) {
const std::size_t block_size = position.GetChain().BlockSize();
const std::size_t entry_size = position.GetChain().EntrySize();
for (Link link(position); link; ++link) {
std::size_t got = util::ReadOrEOF(file_, link->Get(), block_size);
UTIL_THROW_IF(got % entry_size, ReadSizeException, "File ended with " << got << " bytes, not a multiple of " << entry_size << ".");
if (got == 0) {
link.Poison();
return;
} else {
link->SetValidSize(got);
}
}
}
void PRead::Run(const ChainPosition &position) {
scoped_fd owner;
if (own_) owner.reset(file_);
const uint64_t size = SizeOrThrow(file_);
UTIL_THROW_IF(size % static_cast<uint64_t>(position.GetChain().EntrySize()), ReadSizeException, "File size " << file_ << " size is " << size << " not a multiple of " << position.GetChain().EntrySize());
const std::size_t block_size = position.GetChain().BlockSize();
const uint64_t block_size64 = static_cast<uint64_t>(block_size);
Link link(position);
uint64_t offset = 0;
for (; offset + block_size64 < size; offset += block_size64, ++link) {
PReadOrThrow(file_, link->Get(), block_size, offset);
link->SetValidSize(block_size);
}
// size - offset is <= block_size, so it casts to 32-bit fine.
if (size - offset) {
PReadOrThrow(file_, link->Get(), size - offset, offset);
link->SetValidSize(size - offset);
++link;
}
link.Poison();
}
void Write::Run(const ChainPosition &position) {
for (Link link(position); link; ++link) {
WriteOrThrow(file_, link->Get(), link->ValidSize());
}
}
void WriteAndRecycle::Run(const ChainPosition &position) {
const std::size_t block_size = position.GetChain().BlockSize();
for (Link link(position); link; ++link) {
WriteOrThrow(file_, link->Get(), link->ValidSize());
link->SetValidSize(block_size);
}
}
} // namespace stream
} // namespace util
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