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Buffer转整数时，支持指定起始位置和大小端

This commit is contained in:
大石头 2017-07-08 10:14:42 +08:00
parent 11cfe84b32
commit fb91451698
2 changed files with 45 additions and 24 deletions
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63
Core/Buffer.cpp
View File

@ -281,40 +281,61 @@ String Buffer::ToHex(char sep, int newLine) const
return str;
}
ushort Buffer::ToUInt16() const
ushort Buffer::ToUInt16(int offset, bool isLittleEndian) const
{
auto p = GetBuffer();
// 字节对齐时才能之前转为目标整数
if (((int)p & 0x01) == 0) return *(ushort*)p;
auto p = GetBuffer() + offset;
if (isLittleEndian)
{
// 字节对齐时才能之前转为目标整数
if (((int)p & 0x01) == 0) return *(ushort*)p;
return p[0] | (p[1] << 8);
return p[0] | (p[1] << 8);
}
else
{
return p[1] | (p[0] << 8);
}
}
//根据数据格式不同选择不同的转换方式，默认高位在后
uint Buffer::ToUInt32(bool ishigh) const
uint Buffer::ToUInt32(int offset, bool isLittleEndian) const
{
auto p = GetBuffer();
if (ishigh)
auto p = GetBuffer() + offset;
if (isLittleEndian)
{
return (p[2] << 8) | (p[1] << 0x10) | (p[0] << 0x18);
}
// 字节对齐时才能之前转为目标整数
if (((int)p & 0x03) == 0) return *(uint*)p;
// 字节对齐时才能之前转为目标整数
if (((int)p & 0x03) == 0) return *(uint*)p;
return p[0] | (p[1] << 8) | (p[2] << 0x10) | (p[3] << 0x18);
return p[0] | (p[1] << 8) | (p[2] << 0x10) | (p[3] << 0x18);
}
else
{
return p[3] | (p[2] << 8) | (p[1] << 0x10) | (p[0] << 0x18);
}
}
UInt64 Buffer::ToUInt64() const
UInt64 Buffer::ToUInt64(int offset, bool isLittleEndian) const
{
auto p = GetBuffer();
// 字节对齐时才能之前转为目标整数
if (((int)p & 0x07) == 0) return *(UInt64*)p;
if (isLittleEndian)
{
auto p = GetBuffer() + offset;
// 字节对齐时才能之前转为目标整数
if (((int)p & 0x07) == 0) return *(UInt64*)p;
uint n1 = p[0] | (p[1] << 8) | (p[2] << 0x10) | (p[3] << 0x18);
p += 4;
uint n2 = p[0] | (p[1] << 8) | (p[2] << 0x10) | (p[3] << 0x18);
uint n1 = ToUInt32(offset, isLittleEndian);
offset += 4;
uint n2 = ToUInt32(offset, isLittleEndian);
return n1 | ((UInt64)n2 << 0x20);
return n1 | ((UInt64)n2 << 0x20);
}
else
{
uint n1 = ToUInt32(offset, isLittleEndian);
offset += 4;
uint n2 = ToUInt32(offset, isLittleEndian);
return n2 | ((UInt64)n1 << 0x20);
}
}
void Buffer::Write(ushort value, int index)

6
Core/Buffer.h
View File

@ -82,9 +82,9 @@ public:
// 显示十六进制数据，指定分隔字符和换行长度
String ToHex(char sep = 0, int newLine = 0) const;
ushort ToUInt16() const;
uint ToUInt32(bool ishigh = false) const;
UInt64 ToUInt64() const;
ushort ToUInt16(int offset = 0, bool isLittleEndian = true) const;
uint ToUInt32(int offset = 0, bool isLittleEndian = true) const;
UInt64 ToUInt64(int offset = 0, bool isLittleEndian = true) const;
void Write(ushort value, int index = 0);
void Write(short value, int index = 0);
void Write(uint value, int index = 0);