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Add readahead to VariantParser

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Adds a readahead buffer to VariantParser, to prevent large numbers of freads for single bytes, which is inefficient.
This commit is contained in:
lawnjelly
2022-08-30 11:42:36 +01:00
parent 073032b6d0
commit 29d4d4105e
2 changed files with 84 additions and 28 deletions
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35
core/variant_parser.h
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@@ -38,35 +38,50 @@
class VariantParser {
public:
struct Stream {
virtual CharType get_char() = 0;
virtual bool is_utf8() const = 0;
virtual bool is_eof() const = 0;
private:
enum { READAHEAD_SIZE = 2048 };
CharType readahead_buffer[READAHEAD_SIZE];
uint32_t readahead_pointer = 0;
uint32_t readahead_filled = 0;
bool eof = false;
protected:
virtual uint32_t _read_buffer(CharType *p_buffer, uint32_t p_num_chars) = 0;
public:
CharType saved;
CharType get_char();
virtual bool is_utf8() const = 0;
bool is_eof() const { return eof; }
Stream() :
saved(0) {}
virtual ~Stream() {}
};
struct StreamFile : public Stream {
protected:
virtual uint32_t _read_buffer(CharType *p_buffer, uint32_t p_num_chars);
public:
FileAccess *f;
virtual CharType get_char();
virtual bool is_utf8() const;
virtual bool is_eof() const;
StreamFile() { f = nullptr; }
};
struct StreamString : public Stream {
String s;
private:
int pos;
virtual CharType get_char();
virtual bool is_utf8() const;
virtual bool is_eof() const;
protected:
virtual uint32_t _read_buffer(CharType *p_buffer, uint32_t p_num_chars);
public:
String s;
virtual bool is_utf8() const;
StreamString() { pos = 0; }
};