forked from endernon/PGRData
115 lines
No EOL
2.4 KiB
Lua
115 lines
No EOL
2.4 KiB
Lua
local Binary = {}
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local Reader = require("Binary/Reader")
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local OFFSET = 0
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function Binary.New(path)
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local temp = {}
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setmetatable(temp, { __index = Binary })
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local result = temp:Ctor(path)
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if not result then
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return nil
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end
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return temp
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end
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function Binary:Ctor(path)
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local file, err = io.open(path, "rb")
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if not file then
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XLog.Error(string.format("Binary:Ctor 打开文件失败 %s ,%s", path, err))
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return
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end
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local len = assert(file:seek("end"))
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self.file = path
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self.len = len
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self.fileStream = file
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return true
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end
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--读取int默认4字节，其他类型暂时不管了
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function Binary:ReadInt(position)
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position = position or 0
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if position >= self.len then
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XLog.Error(string.format("Binary.ReadInt 超出长度 %s，position = %s", self.len, position))
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return
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end
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local startPos = self:Seek("set", 0)
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local bytes = self:Read(4)
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if not bytes then
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return 0
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end
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local b1, b2, b3, b4 = string.byte(bytes, 1, 4)
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return b1 | b2 << 8 | b3 << 16 | b4 << 24
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end
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--读取字节
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function Binary:Read(len)
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local bytes, err = self.fileStream:read(len)
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if not bytes then
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XLog.Error(string.format("Binary.Read 读取二进制失败 len = %s,%s", len, err))
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return
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end
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return bytes
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end
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--读取内存块
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function Binary:GetReader(len, offset)
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local bytes = self:ReadBytes(len, offset)
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local reader = Reader.New(bytes, len)
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return reader
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end
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--读取内存块
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function Binary:ReadBytes(len, offset)
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if not len then
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XLog.Error(len)
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end
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if len >= self.len then
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XLog.Error(string.format("Binary.ReadBytes 超出长度 %s, len = %s", self.len, len))
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return
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end
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local startPos = self:Seek("set", offset)
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local bytes = self:Read(len)
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return bytes
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end
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--定位
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function Binary:Seek(position, offset)
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offset = offset and offset + OFFSET or OFFSET
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local len, err = self.fileStream:seek(position, offset)
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if not len then
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XLog.Error(string.format("Binary.Seek 失败，offset = %s ,position = %s,%s", offset, position, err))
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return
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end
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return len
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end
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function Binary:ReadAll()
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local startPos = self:Seek("set", 0)
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local bytes = self:Read("*a")
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return bytes
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end
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function Binary:Close()
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self.fileStream:close()
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self.fileStream = nil
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end
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return Binary |