blog/cpp/fonts/reader/buffer.cpp

#include "buffer.h"
#include <cstring>
#include <sstream>
#include "endian.h"


buffer::buffer(std::string data)
{
    fp = std::stringstream(data);
    length = data.length();
};

std::streamsize buffer::read(char *bytes, uint16_t l)
{
    fp.read(reinterpret_cast<char *>(bytes), l);
    std::streamsize bytesRead = fp.gcount();
    return bytesRead;
};
int8_t buffer::readInt8()
{
    int8_t ret = 0;
    fp.read(reinterpret_cast<char*>(&ret), sizeof(ret));
    return htobe16(ret);
}

int16_t buffer::readInt16()
{
    int16_t ret = 0;
    fp.read(reinterpret_cast<char*>(&ret), sizeof(ret));
    return htobe16(ret);
};

int32_t buffer::readInt32()
{
    int32_t ret = 0;
    fp.read(reinterpret_cast<char*>(&ret), sizeof(ret));
    return htobe16(ret);
}

int64_t buffer::readInt64()
{
    uint64_t ret = 0;
    fp.read(reinterpret_cast<char*>(&ret), sizeof(ret));
    return htobe16(ret);
}

uint8_t buffer::readUint8()
{
    uint8_t ret = 0;
    fp.read(reinterpret_cast<char*>(&ret), sizeof(ret));
    return ret;
}

uint16_t buffer::readUint16()
{
    uint16_t ret = 0;
    fp.read(reinterpret_cast<char*>(&ret), sizeof(ret));
    return htobe16(ret);
};

uint24_t buffer::readUint24(){
    uint24_t ret(0);
    fp>>ret;
    return ret;
}

uint32_t buffer::readUint32()
{
    uint32_t ret = 0;
    fp.read(reinterpret_cast<char*>(&ret), sizeof(ret));
    return htobe32(ret);
}

uint64_t buffer::readUint64()
{
    uint64_t ret = 0;
    fp.read(reinterpret_cast<char*>(&ret), sizeof(ret));
    return htobe64(ret);
}

std::string buffer::readString(int l)
{
    char *data = new char[l];
    fp.read(data, l);
    std::streamsize bytesRead = fp.gcount();
    auto ret = std::string(data, bytesRead);
    delete[] data;
    return ret;
}
FWORD buffer::readFWord(){
    return readInt16();
}
UFWORD buffer::readUFWord(){
    return readUint16();
}
Offset8 buffer::readOffset8(){
    return readUint8();
}
Offset16 buffer::readOffset16(){
    return readUint16();
}
Offset24 buffer::readOffset24(){
    return readUint24();
}
Offset32 buffer::readOffset32(){
    return readUint32();
}
int24_t buffer::readInt24(){
    int24_t i;
    fp>>i;
    return i;
}
Fixed buffer::readFixed(){
    Fixed f;
    fp>>f;
    return f;
}
F2DOT14 buffer::readF2Dot14(){
    F2DOT14 f;
    fp>>f;
    return f;
}
Version16Dot16 buffer::readVersion16Dot16(){
    Version16Dot16 v;
    fp>>v;
    return v;
}
Tag buffer::readTag(){
    Tag t;
    fp>>t;
    return t;
}
bool buffer::seek(int64_t i)
{
    if (i > length)
    {
        return false;
    }
    fp.seekg(i);
    return true;
}

std::streampos buffer::curr()
{
    return fp.tellg();
}