130 lines
2.9 KiB
C++
130 lines
2.9 KiB
C++
#include "thin-provisioning/emitter.h"
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#include "contrib/tmakatos_emitter.h"
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#include <iostream>
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#include <climits>
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using namespace std;
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using namespace thin_provisioning;
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//----------------------------------------------------------------
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namespace tmakatos_emitter {
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template <typename T>
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std::ostream &operator << (ostream &out, boost::optional<T> const &maybe) {
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if (maybe)
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out << *maybe;
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return out;
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}
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//------------------------------------------------
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// binary generator
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//------------------------------------------------
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binary_emitter::binary_emitter(ostream &out): out_(out) {
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}
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void binary_emitter::begin_superblock(string const &uuid,
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uint64_t time,
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uint64_t trans_id,
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boost::optional<uint32_t> flags,
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boost::optional<uint32_t> version,
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uint32_t data_block_size,
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uint64_t nr_data_blocks,
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boost::optional<uint64_t> metadata_snap) {
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}
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void binary_emitter::end_superblock() {
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}
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void binary_emitter::begin_device(uint32_t dev_id,
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uint64_t mapped_blocks,
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uint64_t trans_id,
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uint64_t creation_time,
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uint64_t snap_time) {
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cur = 0;
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bitmap = 0;
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}
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void binary_emitter::end_device() {
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emit_bmp(true);
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}
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void binary_emitter::begin_named_mapping(string const &name) { }
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void binary_emitter::end_named_mapping() { }
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void binary_emitter::identifier(string const &name) { }
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void binary_emitter::range_map(uint64_t origin_begin, uint64_t, uint32_t,
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uint64_t len) {
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uint64_t n = origin_begin / unit;
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uint64_t i;
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assert(n >= cur);
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assert(len > 0);
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/*
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* Cover the gap between the last emitted unit and the current one.
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*/
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if (n > cur)
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do { emit_bmp(); } while (cur < n);
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/*
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* Emit partial unit.
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*/
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if (origin_begin & (unit - 1)) {
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const uint64_t j = min(len,
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(origin_begin & ~(unit - 1)) + unit - origin_begin);
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for (i = origin_begin; i < origin_begin + j; i++)
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bitmap |= 1ULL << (i & (unit - 1));
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if (j == len)
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return;
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emit_bmp();
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len -= j;
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origin_begin = i;
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}
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/*
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* Emit full units until end.
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*/
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n = (origin_begin + len) / unit;
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while (cur < n) {
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bitmap = ~0;
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emit_bmp();
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len -= unit;
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}
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origin_begin = cur * unit;
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/*
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* Emit final unit.
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*/
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for (i = origin_begin; i < origin_begin + len; i++)
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bitmap |= 1ULL << (i & (unit - 1));
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}
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void binary_emitter::single_map(uint64_t origin_block, uint64_t, uint32_t) {
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range_map(origin_block, 0, 0, 1);
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}
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void binary_emitter::emit_bmp(bool omit_if_zero) {
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if (bitmap || !omit_if_zero)
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out_.write((const char*)&bitmap, sizeof bitmap);
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bitmap = 0;
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cur++;
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}
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}
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//----------------------------------------------------------------
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extern "C" {
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emitter::ptr create_emitter(ostream &out) {
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return emitter::ptr(new tmakatos_emitter::binary_emitter(out));
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}
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}
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//----------------------------------------------------------------
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