text: ﻿#include <windows.h>
  #include <tchar.h>
  #include <crass_types.h>
  #include <acui.h>
  #include <cui.h>
  #include <package.h>
  #include <resource.h>
  #include <cui_error.h>
  #include <stdio.h>
  #include <bzlib.h>
  #include <vector>
  #include "blowfish.h"
  
  using namespace std;
  
  /* 接口数据结构: 表示cui插件的一般信息 */
  struct acui_information Lua_cui_information = {
  	_T("PUC-Rio"),			/* copyright */
  	_T("Lua"),				/* system */
  	_T(".pck"),				/* package */
  	_T("1.0.1"),			/* revision */
  	_T("痴漢公賊"),			/* author */
  	_T("2008-5-28 19:52"),	/* date */
  	NULL,					/* notion */
  	ACUI_ATTRIBUTE_LEVEL_UNSTABLE
  };
  
  /* 所有的封包特定的数据结构都要放在这个#pragma段里 */
  #pragma pack (1)
  typedef struct {
  	s8 magic[12];		// "PACK_FILE001"
  	u32 index_entries;
  	u32 index_length;	// headsize
  } pck_header_t;
  #pragma pack ()
  
  typedef struct {
  	char name[MAX_PATH];
  	DWORD offset;
  	DWORD comprlen;
  	DWORD uncomprlen;
  } pck_entry_t;
  
  static BYTE blowfish_key[] = "\x9F\xC0\xC1\x9F\x91";
  
  static void blowfish_key_init(void)
  {
  	for (DWORD i = 0; i < 5; i++)
  		blowfish_key[i] ^= 0xf0;
  }
  
  static void pck_decrypt(DWORD *cipher, DWORD cipher_length)
  {
  	BLOWFISH_CTX ctx;
  	DWORD i;
  	
  	Blowfish_Init(&ctx, blowfish_key, 5);
  	for (i = 0; i < cipher_length / 8; i++)
  		Blowfish_Decrypt(&ctx, &cipher[i * 2 + 0], &cipher[i * 2 + 1]);
  }
  
  static void pck_decrypt2(DWORD *cipher, DWORD cipher_length, 
  						 BYTE *key, DWORD key_length)
  {
  	BLOWFISH_CTX ctx;
  	DWORD i;
  	
  	Blowfish_Init(&ctx, key, key_length);
  	for (i = 0; i < cipher_length / 8; i++)
  		Blowfish_Decrypt(&ctx, &cipher[i * 2 + 0], &cipher[i * 2 + 1]);
  }
  
  /********************* pck *********************/
  
  /* 封包匹配回调函数 */
  static int Lua_pck_match(struct package *pkg)
  {
  	s8 magic[12];
  
  	if (pkg->pio->open(pkg, IO_READONLY))
  		return -CUI_EOPEN;
  
  	if (pkg->pio->read(pkg, magic, sizeof(magic))) {
  		pkg->pio->close(pkg);
  		return -CUI_EREAD;
  	}
  
  	if (strncmp(magic, "PACK_FILE001", 12)) {
  		pkg->pio->close(pkg);
  		return -CUI_EMATCH;	
  	}
  
  	return 0;	
  }
  
  /* 封包索引目录提取函数 */
  static int Lua_pck_extract_directory(struct package *pkg,
  									 struct package_directory *pkg_dir)
  {
  	pck_header_t pck_header;
  	if (pkg->pio->readvec(pkg, &pck_header, sizeof(pck_header), 0, IO_SEEK_SET))
  		return -CUI_EREADVEC;
  
  	BYTE *index = new BYTE[pck_header.index_length];
  	if (!index)
  		return -CUI_EMEM;
  
  	if (pkg->pio->read(pkg, index, pck_header.index_length)) {
  		delete [] index;
  		return -CUI_EREAD;
  	}
  
  	pck_decrypt((DWORD *)index, pck_header.index_length);
  
  	pck_entry_t *pck_index_buffer = new pck_entry_t[pck_header.index_entries];
  	if (!pck_index_buffer)
  		return -CUI_EMEM;
  
  	BYTE *p = index;
  	DWORD offset = sizeof(pck_header_t) + pck_header.index_length;
  	for (DWORD i = 0; i < pck_header.index_entries; ++i) {
  		pck_entry_t &entry = pck_index_buffer[i];
  		entry.uncomprlen = *(u32 *)p;
  		p += 4;
  		strcpy(entry.name, (char *)p);		
  		p += strlen((char *)p) + 1;
  		entry.comprlen = *(u32 *)p;
  		p += 4;
  		entry.offset = offset;
  		offset += entry.comprlen + 1;
  	}
  	delete [] index;	
  
  	pkg_dir->index_entries = pck_header.index_entries;
  	pkg_dir->directory = pck_index_buffer;
  	pkg_dir->directory_length = pck_header.index_entries * sizeof(pck_entry_t);
  	pkg_dir->index_entry_length = sizeof(pck_entry_t);
  	pkg_dir->flags = PKG_DIR_FLAG_SKIP0;
  
  	return 0;
  }
  
  /* 封包索引项解析函数 */
  static int Lua_pck_parse_resource_info(struct package *pkg,
  									   struct package_resource *pkg_res)
  {
  	pck_entry_t *pck_entry;
  
  	pck_entry = (pck_entry_t *)pkg_res->actual_index_entry;
  	strcpy(pkg_res->name, pck_entry->name);
  	pkg_res->name_length = -1;			/* -1表示名称以NULL结尾 */
  	pkg_res->raw_data_length = pck_entry->comprlen;
  	pkg_res->actual_data_length = pck_entry->uncomprlen;
  	pkg_res->offset = pck_entry->offset;
  
  	return 0;
  }
  
  /* 封包资源提取函数 */
  static int Lua_pck_extract_resource(struct package *pkg,
  									struct package_resource *pkg_res)
  {
  	u8 filetype;
  	if (pkg->pio->readvec(pkg, &filetype, 1, pkg_res->offset, IO_SEEK_SET))
  		return -CUI_EREADVEC;
  
  	DWORD comprlen = pkg_res->raw_data_length;
  	BYTE *compr = new BYTE[comprlen];
  	if (!compr)
  		return -CUI_EMEM;
  
  	if (pkg->pio->readvec(pkg, compr, comprlen,	pkg_res->offset + 1, IO_SEEK_SET)) {
  		delete [] compr;
  		return -CUI_EREADVEC;
  	}
  
  	/*
  	 * 0 - music (.wav, .ogg, .mp3)
  	 * 2 - image (.png, .dds)
  	 * 3 - script (.lua, .txt)
  	 */
  	if (filetype) {
  		pck_decrypt((DWORD *)compr, comprlen);
  
  		if (filetype == 3) {	// 3 - script (.lua, .txt)
  			DWORD uncomprlen = pkg_res->actual_data_length;
  			BYTE *uncompr = new BYTE[uncomprlen];
  			if (!uncompr) {
  				delete [] compr;
  				return -CUI_EMEM;			
  			}
  			unsigned int act_uncomprlen = uncomprlen;
  			if (BZ2_bzBuffToBuffDecompress((char *)uncompr, &act_uncomprlen,
  					(char *)compr, comprlen, 0, 0) != BZ_OK) {
  				delete [] uncompr;
  				delete [] compr;
  				return -CUI_EUNCOMPR;
  			}
  			pkg_res->actual_data = uncompr;
  			pkg_res->actual_data_length = act_uncomprlen;
  		}
  	}
  	pkg_res->raw_data = compr;
  
  	return 0;
  }
  
  /* 资源保存函数 */
  static int Lua_pck_save_resource(struct resource *res, 
  								 struct package_resource *pkg_res)
  {
  	if (res->rio->create(res))
  		return -CUI_ECREATE;
  
  	if (pkg_res->actual_data && pkg_res->actual_data_length) {
  		if (res->rio->write(res, pkg_res->actual_data, pkg_res->actual_data_length)) {
  			res->rio->close(res);
  			return -CUI_EWRITE;
  		}
  	} else if (pkg_res->raw_data && pkg_res->raw_data_length) {
  		if (res->rio->write(res, pkg_res->raw_data, pkg_res->raw_data_length)) {
  			res->rio->close(res);
  			return -CUI_EWRITE;
  		}
  	}
  
  	res->rio->close(res);
  	
  	return 0;
  }
  
  /* 封包资源释放函数 */
  static void Lua_pck_release_resource(struct package *pkg, 
  									 struct package_resource *pkg_res)
  {
  	if (pkg_res->actual_data) {
  		delete [] pkg_res->actual_data;
  		pkg_res->actual_data = NULL;
  	}
  	if (pkg_res->raw_data) {
  		delete [] pkg_res->raw_data;
  		pkg_res->raw_data = NULL;
  	}
  }
  
  /* 封包卸载函数 */
  static void Lua_pck_release(struct package *pkg, 
  							struct package_directory *pkg_dir)
  {
  	if (pkg_dir->directory) {
  		delete [] pkg_dir->directory;
  		pkg_dir->directory = NULL;
  	}
  
  	pkg->pio->close(pkg);
  }
  
  /* 封包处理回调函数集合 */
  static cui_ext_operation Lua_pck_operation = {
  	Lua_pck_match,					/* match */
  	Lua_pck_extract_directory,		/* extract_directory */
  	Lua_pck_parse_resource_info,	/* parse_resource_info */
  	Lua_pck_extract_resource,		/* extract_resource */
  	Lua_pck_save_resource,			/* save_resource */
  	Lua_pck_release_resource,		/* release_resource */
  	Lua_pck_release					/* release */
  };
  
  /* 接口函数: 向cui_core注册支持的封包类型 */
  int CALLBACK Lua_register_cui(struct cui_register_callback *callback)
  {
  	if (callback->add_extension(callback->cui, _T(".pck"), NULL, 
  		NULL, &Lua_pck_operation, CUI_EXT_FLAG_PKG | CUI_EXT_FLAG_DIR))
  			return -1;
  
  	blowfish_key_init();
  
  	return 0;
  }
  }
  