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Add in-place data construction for Encoder #1

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Add in-place data construction for Encoder #1

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29 changes: 29 additions & 0 deletions wxf_parser.h
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Original file line number Diff line number Diff line change
Expand Up @@ -179,6 +179,11 @@ namespace WXF_PARSER {
// move from existing buffer
Encoder(std::vector<uint8_t>&& buf) : buffer(std::move(buf)) {}

const size_t size() const { return buffer.size(); }
void reserve(const size_t new_size) { buffer.reserve(new_size); }
void resize(const size_t new_size) { buffer.resize(new_size); }
void resize(const size_t new_size, const uint8_t val) { buffer.resize(new_size, val); }

// push ustr directly
Encoder& push_ustr(const std::vector<uint8_t>& str) { buffer.insert(buffer.end(), str.begin(), str.end()); return *this; }
Encoder& push_ustr(const std::string_view str) {
Expand All @@ -193,6 +198,30 @@ namespace WXF_PARSER {
buffer.insert(buffer.end(), (uint8_t*)start, (uint8_t*)end); return *this;
}

// generate data as ustr in the back
template<typename T, typename F>
Encoder& generate_back_ustr(const size_t len, F&& func) {
static_assert(std::is_invocable_r_v<T, F, size_t>, "func should be callable with size_t and return T");
size_t old_size = buffer.size();
buffer.resize(old_size + len * sizeof(T));
T* data_ptr = (T*)(buffer.data() + old_size);
for (size_t i = 0; i < len; i++) {
data_ptr[i] = func(i);
}
return *this;
}

// generate transformed data as ustr in the back
template<typename T1, typename T2, typename F>
Encoder& transform_back_ustr(const T2* src_ptr, const size_t len, F&& func) {
static_assert(std::is_invocable_r_v<T1, F, T2>, "func should be callable with T2 and return T1");
size_t old_size = buffer.size();
buffer.resize(old_size + len * sizeof(T1));
T1* data_ptr = (T1*)(buffer.data() + old_size);
std::transform(src_ptr, src_ptr + len, data_ptr, func);
return *this;
}

Encoder& push_integer(const int64_t val) {
auto num_type = minimal_signed_bits(val);
switch (num_type) {
Expand Down