181 lines
4.0 KiB
C++
181 lines
4.0 KiB
C++
#include "Config.h"
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#include "..\Security\Crc.h"
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Storage* ConfigBlock::Device = NULL;
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void* ConfigBlock::BaseAddress = NULL;
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bool ConfigBlock::IsGoodBlock() const
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{
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if(Signature != c_Version || HeaderCRC == 0) return false;
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// 计算头部 CRC。从数据CRC开始，包括大小和名称
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ushort crc = Crc::Hash16(&DataCRC, sizeof(*this) - offsetof(ConfigBlock, DataCRC));
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return crc == HeaderCRC;
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}
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bool ConfigBlock::IsGoodData() const
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{
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// 计算数据块CRC
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ushort crc = Crc::Hash16(Data(), Size);
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return crc == DataCRC;
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}
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const ConfigBlock* ConfigBlock::Next() const
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{
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if(!IsGoodBlock()) return NULL;
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// 确保数据部分2字节对齐，便于Flash操作
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uint s = (Size + 1) & ~1;
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return (const ConfigBlock*)((byte*)Data() + s);
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}
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// 数据所在地址，紧跟头部后面
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const void* ConfigBlock::Data() const
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{
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return (const void*)&this[1];
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}
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//--//
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// 构造一个新的配置块
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bool ConfigBlock::Init(const char* name, const ByteArray& bs)
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{
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if(name == NULL || strlen(name) >= sizeof(Name)) return false;
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//memset(this, 0, sizeof(*this));
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// 数据长度为0，表明是置为无效
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if(bs.Length() > 0)
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DataCRC = Crc::Hash16(bs.GetBuffer(), bs.Length());
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else
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DataCRC = 0;
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/*// 只有首次允许设置名字和大小，避免后面随意扩张引起越界覆盖
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if(IsGoodBlock())
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{
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if(bs.Length() > Size) return false;
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}
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else*/
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{
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Signature = c_Version;
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Size = bs.Length();
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memset(Name, 0, ArrayLength(Name));
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memcpy(Name, name, ArrayLength(Name));
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}
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// 计算头部CRC。包括数据CRC、大小、名称
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HeaderCRC = Crc::Hash16(&DataCRC, sizeof(*this) - offsetof(ConfigBlock, DataCRC));
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return true;
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}
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//--//
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// 循环查找配置块
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const ConfigBlock* ConfigBlock::Find(const char* name, bool fAppend) const
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{
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const ConfigBlock* ptr = this;
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// 遍历链表，找到同名块
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while(ptr->IsGoodBlock())
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{
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if(ptr->IsGoodData() && name && strcmp(name, ptr->Name) == 0)
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{
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return ptr;
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}
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ptr = ptr->Next();
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}
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// 如果需要添加，返回最后一个非法块的地址
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return fAppend ? ptr : NULL;
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}
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// 更新块
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bool ConfigBlock::Write(const void* addr, const ByteArray& bs)
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{
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if(bs.Length() > Size) return false;
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bool rs = true;
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// 先写入头部，然后写入数据
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uint len = sizeof(ConfigBlock) - offsetof(ConfigBlock, Signature);
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rs &= Device->Write((uint)addr, ByteArray((byte*)&Signature, len));
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if(bs.Length() > 0)
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rs &= Device->Write((uint)addr + len, ByteArray(bs.GetBuffer(), Size));
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return rs;
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}
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// 废弃
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bool ConfigBlock::Invalid(const char* name, const void* addr)
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{
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return Set(name, ByteArray(0), addr);
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}
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// 根据名称更新块
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bool ConfigBlock::Set(const char* name, const ByteArray& bs, const void* addr)
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{
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if(name == NULL) return false;
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if(!addr) addr = BaseAddress;
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const ConfigBlock* cfg = (const ConfigBlock*)addr;
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if(cfg) cfg = cfg->Find(name, true);
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if(cfg)
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{
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// 重新搞一个配置头，使用新的数据去重新初始化
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ConfigBlock header;
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header.Init(name, bs);
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return header.Write(cfg, bs);
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}
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return false;
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}
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// 获取配置数据
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bool ConfigBlock::Get(const char* name, ByteArray& bs, const void* addr)
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{
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if(name == NULL) return false;
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if(!addr) addr = BaseAddress;
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const ConfigBlock* cfg = (const ConfigBlock*)addr;
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if(cfg) cfg = cfg->Find(name, false);
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if(cfg)
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{
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if(cfg->Size <= bs.Capacity())
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{
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bs.Copy((byte*)cfg->Data(), 0, cfg->Size);
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bs.SetLength(cfg->Size);
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return true;
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}
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}
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return false;
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}
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// 初始化
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TConfig::TConfig()
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{
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// 实际内存大小，减去头部大小
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uint len = sizeof(this) - ((int)&Length - (int)this);
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//memset(&Length, 0, len);
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Length = len;
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}
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void TConfig::LoadDefault()
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{
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Kind = Sys.Code;
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//Server = 0x01;
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PingTime = 15;
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OfflineTime = 60;
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}
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