forked from pig4210/xlualib
/
lzlib.cpp
214 lines (198 loc) · 4.93 KB
/
lzlib.cpp
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#include "xlualib.h"
#define ZLIB_WINAPI
#include <zlib.h>
#pragma comment(lib, "zlibstat")
#pragma comment(linker, "/NODEFAULTLIB:msvcrt.lib")
static int LUA_C_zlib_compress(lua_State* ls)
{
size_t l = 0;
auto s = luaL_checklstring(ls, 1, &l);
if(l == 0)
{
lua_pushstring(ls, "");
return 1;
}
string cp;
cp.reserve(compressBound(l));
while(true)
{
size_t size = cp.capacity();
const intptr_t rets = compress(
(Bytef*)cp.end()._Ptr,
(uLongf*)&size,
(const Bytef*)s,
(uLongf)l);
switch(rets)
{
case Z_OK:
lua_pushlstring(ls, cp.end()._Ptr, size);
return 1;
case Z_BUF_ERROR:
cp.reserve(cp.capacity() + 0x10);
continue;
default:
break;
}
lua_pushstring(ls, (xmsg() << "zlibѹËõʧ°Ü : " << rets).c_str());
return lua_error(ls);
}
}
static int LUA_C_zlib_uncompress(lua_State* ls)
{
size_t l = 0;
auto s = luaL_checklstring(ls, 1, &l);
if(l == 0)
{
lua_pushstring(ls, "");
return 1;
}
string cp;
cp.reserve(l * 2);
while(true)
{
size_t size = cp.capacity();
const intptr_t rets = uncompress(
(Bytef*)cp.end()._Ptr,
(uLongf*)&size,
(const Bytef*)s,
(uLongf)l);
switch(rets)
{
case Z_OK:
lua_pushlstring(ls, cp.end()._Ptr, size);
return 1;
case Z_BUF_ERROR:
cp.reserve(cp.capacity() + 0x10);
continue;
default:
break;
}
lua_pushstring(ls, (xmsg() << "zlib½âѹʧ°Ü : " << rets).c_str());
return lua_error(ls);
}
}
static int LUA_C_gzip_compress(lua_State* ls)
{
size_t l = 0;
auto s = luaL_checklstring(ls, 1, &l);
if(l == 0)
{
lua_pushstring(ls, "");
return 1;
}
string cp;
cp.reserve(compressBound(l));
while(true)
{
z_stream c_stream;
c_stream.zalloc = nullptr;
c_stream.zfree = nullptr;
c_stream.opaque = nullptr;
intptr_t rets = deflateInit2(&c_stream,
Z_DEFAULT_COMPRESSION,
Z_DEFLATED,
MAX_WBITS + 16,
8,
Z_DEFAULT_STRATEGY);
if(rets != Z_OK)
{
lua_pushstring(ls, (xmsg() << "gzipѹËõ³õʼ»¯Ê§°Ü : " << rets).c_str());
return lua_error(ls);
}
c_stream.next_in = (Bytef*)s;
c_stream.avail_in = l;
c_stream.next_out = (Bytef*)cp.c_str();
c_stream.avail_out = cp.capacity();
rets = deflate(&c_stream, Z_FINISH);
const intptr_t rend = deflateEnd(&c_stream);
switch(rets)
{
case Z_STREAM_END:
if(rend == Z_OK)
{
lua_pushlstring(ls, cp.end()._Ptr, c_stream.total_out);
return 1;
}
break;
case Z_OK:
case Z_BUF_ERROR:
cp.reserve(cp.capacity() + 0x10);
continue;
default:
break;
}
lua_pushstring(ls, (xmsg() << "ѹËõʧ°Ü : " << rets << ' ' << rend).c_str());
return lua_error(ls);
}
}
static int LUA_C_gzip_uncompress(lua_State* ls)
{
size_t l = 0;
auto s = luaL_checklstring(ls, 1, &l);
if(l == 0)
{
lua_pushstring(ls, "");
return 1;
}
string str(s, l);
string cp;
cp.reserve(l * 2);
bool head_add = false;
static char dummy_head[2] =
{
0x8 + 0x7 * 0x10,
(((0x8 + 0x7 * 0x10) * 0x100 + 30) / 31 * 31) & 0xFF,
};
while(true)
{
z_stream d_stream = { 0 };
d_stream.zalloc = nullptr;
d_stream.zfree = nullptr;
d_stream.opaque = nullptr;
intptr_t rets = inflateInit2(&d_stream, MAX_WBITS + 16);
if(rets != Z_OK)
{
lua_pushstring(ls, (xmsg() << "gzip½âѹËõ³õʼ»¯Ê§°Ü : " << rets).c_str());
return lua_error(ls);
}
d_stream.next_in = (Bytef*)str.c_str();
d_stream.avail_in = str.size();
d_stream.next_out = (Bytef*)cp.c_str();
d_stream.avail_out = cp.capacity();
rets = inflate(&d_stream, Z_FINISH);
const intptr_t rend = inflateEnd(&d_stream);
if((rets == Z_DATA_ERROR) && !head_add)
{
str.insert(str.begin(), &dummy_head[0], &dummy_head[sizeof(dummy_head)]);
head_add = true;
continue;
}
switch(rets)
{
case Z_STREAM_END:
if(rend == Z_OK)
{
lua_pushlstring(ls, cp.end()._Ptr, d_stream.total_out);
return 1;
}
break;
case Z_OK:
case Z_BUF_ERROR:
cp.reserve(cp.capacity() + 0x10);
continue;
default:
break;
}
lua_pushstring(ls, (xmsg() << "½âѹËõʧ°Ü : " << rets).c_str());
return lua_error(ls);
}
}
void register_zlib(lua_State* ls)
{
lua_pop(ls, lua_gettop(ls));
lua_register(ls, "zlib_compress", LUA_C_zlib_compress);
lua_register(ls, "zlib_uncompress", LUA_C_zlib_uncompress);
lua_register(ls, "gzip_compress", LUA_C_gzip_compress);
lua_register(ls, "gzip_uncompress", LUA_C_gzip_uncompress);
lua_pop(ls, lua_gettop(ls));
}