From 50d3d4fd1b3defacfd4eceac7081d5a051d90880 Mon Sep 17 00:00:00 2001
From: Kiritow <1362050620@qq.com>
Date: Sun, 18 Mar 2018 11:53:38 +0800
Subject: [PATCH] Add file bundler

---
 libbundle.lua | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 libbundle.lua

diff --git a/libbundle.lua b/libbundle.lua
new file mode 100644
index 0000000..a4514e6
--- /dev/null
+++ b/libbundle.lua
@@ -0,0 +1,74 @@
+-- LibBundle - Bundle multiple files into a single one
+-- Author: Github/Kiritow
+
+function Bundle(file_table,bundle_file)
+    local f=io.open(bundle_file,"wb")
+    if(f==nil) then error("Output file can't be opened") end
+    local cnt=0
+    local info={}
+    for k,v in pairs(file_table) do
+        local x=io.open(v,"rb")
+        if(x==nil) then 
+            f:close()
+            error("Failed to read file: " .. v)
+        end
+        local sz=x:seek("end")
+        table.insert(info,{
+            ["name"]=v,
+            ["size"]=sz
+        })
+        x:close()
+        cnt=cnt+1
+    end
+    f:write(string.char(string.len(tostring(cnt))),cnt)
+    for i=1,cnt,1 do
+        local namelen=string.len(info[i].name)
+        f:write(string.char(string.len(tostring(namelen))),
+            namelen,
+            info[i].name)
+        local sizelen=string.len(tostring(info[i].size))
+        f:write(string.char(string.len(tostring(sizelen))),
+            sizelen,
+            info[i].size)
+    end
+    for i=1,cnt,1 do
+        local x=io.open(info[i].name,"rb")
+        local s=x:read("*a")
+        f:write(s)
+        x:close()
+    end
+    f:close()
+    return cnt
+end
+
+
+function Unbundle(bundle_file)
+    local f=io.open(bundle_file,"rb")
+    if(f==nil) then error("Input bundle file not found.") end
+    local psz=string.byte(f:read(1))
+    local cnt=tonumber(f:read(psz))
+    local info={}
+    for i=1,cnt,1 do
+        psz=string.byte(f:read(1))
+        local namelen=tonumber(f:read(psz))
+        local name=f:read(namelen)
+        psz=string.byte(f:read(1))
+        local sizelen=tonumber(f:read(psz))
+        local size=tonumber(f:read(sizelen))
+        table.insert(info,{
+            ["name"]=name,
+            ["size"]=size
+        })
+    end
+    for i=1,cnt,1 do
+        local x=io.open(info[i].name,"wb")
+        if(x==nil) then 
+            f:close()
+            error("Output file not found: " .. info[i].name)
+        end
+        local s=f:read(info[i].size)
+        x:write(s)
+        x:close()
+    end
+    return cnt,info
+end
\ No newline at end of file