23 inline size_t TruncateToPageBoundary(size_t page_size, size_t s) {  in TruncateToPageBoundary()
33 inline size_t Roundup(size_t x, size_t y) {  in Roundup()
41 inline size_t Rounddown(size_t x, size_t y) { return (x / y) * y; }  in Rounddown()
58   size_t alignment_;
60   size_t capacity_;
61   size_t cursize_;
89   static bool isAligned(const void* ptr, size_t alignment) {  in isAligned()
93   static bool isAligned(size_t n, size_t alignment) {  in isAligned()
97   size_t Alignment() const {  in Alignment()
101   size_t Capacity() const {  in Capacity()
105   size_t CurrentSize() const {  in CurrentSize()
126   void Alignment(size_t alignment) {  in Alignment()
147   void AllocateNewBuffer(size_t requested_capacity, bool copy_data = false,
148                          uint64_t copy_offset = 0, size_t copy_len = 0) {
159     size_t new_capacity = Roundup(requested_capacity, alignment_);
186   size_t Append(const char* src, size_t append_size) {  in Append()
187     size_t buffer_remaining = capacity_ - cursize_;  in Append()
188     size_t to_copy = std::min(append_size, buffer_remaining);  in Append()
203   size_t Read(char* dest, size_t offset, size_t read_size) const {  in Read()
206     size_t to_read = 0;  in Read()
218     size_t total_size = Roundup(cursize_, alignment_);  in PadToAlignmentWith()
219     size_t pad_size = total_size - cursize_;  in PadToAlignmentWith()
228   void PadWith(size_t pad_size, int padding) {  in PadWith()
235   void RefitTail(size_t tail_offset, size_t tail_size) {  in RefitTail()
251   void Size(size_t cursize) {  in Size()