From 4148c3dbe3d5e607c6669cd95f7400ff4636384a Mon Sep 17 00:00:00 2001
From: vgmoose <me@vgmoose.com>
Date: Mon, 19 Sep 2022 00:33:48 -0400
Subject: [PATCH] package: use zip file pos instead of info

---
 src/Package.cpp | 10 +++++-----
 src/ZipUtil.cpp | 23 ++++++++++++++++++-----
 src/ZipUtil.hpp |  4 ++--
 3 files changed, 25 insertions(+), 12 deletions(-)

diff --git a/src/Package.cpp b/src/Package.cpp
index ad245e8..3186a7e 100644
--- a/src/Package.cpp
+++ b/src/Package.cpp
@@ -127,7 +127,7 @@ bool Package::install(const char* pkg_path, const char* tmp_path)
 	if (manifest->valid)
 	{
 		// get all file info from within the zip, for every path
-		auto infoMap = HomebrewZip->GetPathToFileInfoMapping();
+		auto infoMap = HomebrewZip->GetPathToFilePosMapping();
 
 		for (int i = 0; i < manifest->entries.size(); i++)
 		{
@@ -150,7 +150,7 @@ bool Package::install(const char* pkg_path, const char* tmp_path)
 				continue;
 			}
 
-			auto fileInfo = mapResult->second;
+			auto filePos = mapResult->second;
 
 			int resp = 0;
 			switch (manifest->entries[i].operation)
@@ -158,17 +158,17 @@ bool Package::install(const char* pkg_path, const char* tmp_path)
 			case MEXTRACT:
 				//! Simply Extract, with no checks or anything, won't be deleted upon removal
 				info("%s : EXTRACT\n", pathCStr);
-				resp = HomebrewZip->Extract(ePathCStr, &fileInfo);
+				resp = HomebrewZip->Extract(ePathCStr, NULL, &filePos);
 				break;
 			case MUPDATE:
 				info("%s : UPDATE\n", pathCStr);
-				resp = HomebrewZip->Extract(ePathCStr, &fileInfo);
+				resp = HomebrewZip->Extract(ePathCStr, NULL, &filePos);
 				break;
 			case MGET:
 				info("%s : GET\n", pathCStr);
 				struct stat sbuff;
 				if (stat(ExtractPath.c_str(), &sbuff) != 0) //! File doesn't exist, extract
-					resp = HomebrewZip->Extract(ePathCStr, &fileInfo);
+					resp = HomebrewZip->Extract(ePathCStr, NULL, &filePos);
 				else
 					info("File already exists, skipping...");
 				break;
diff --git a/src/ZipUtil.cpp b/src/ZipUtil.cpp
index ac7d251..42c8075 100644
--- a/src/ZipUtil.cpp
+++ b/src/ZipUtil.cpp
@@ -259,10 +259,10 @@ vector<std::string> UnZip::PathDump()
 }
 
 
-std::unordered_map<string, unz_file_info_s> UnZip::GetPathToFileInfoMapping()
+std::unordered_map<string, unz_file_pos> UnZip::GetPathToFilePosMapping()
 {
 	int i = 0;
-	std::unordered_map<string, unz_file_info_s> paths;
+	std::unordered_map<string, unz_file_pos> paths;
 	for (;;)
 	{
 		int code;
@@ -282,18 +282,30 @@ std::unordered_map<string, unz_file_info_s> UnZip::GetPathToFileInfoMapping()
 		if (fileInfo->uncompressed_size != 0 && fileInfo->compression_method != 0)
 		{
 			// info("PathDump: %s\n", fileName.c_str());
-			paths[fileName] = *fileInfo;
+			unzGetFilePos(fileToUnzip, &paths[fileName]);
 		}
 		free(fileInfo);
 	}
 	return paths;
 }
 
-int UnZip::Extract(const char* path, unz_file_info_s* fileInfo)
+int UnZip::Extract(const char* path, unz_file_info_s* fileInfo, unz_file_pos* file_pos)
 {
 	//check to make sure filepath or fileInfo isnt null
-	if (path == NULL || fileInfo == NULL)
+	if (path == NULL)
 		return -1;
+	
+	if (fileInfo == NULL) {
+		if (file_pos == NULL)
+			return -1;
+
+		// we have a file pos, seek to that file
+		unzGoToFilePos(fileToUnzip, file_pos);
+		fileInfo = GetFileInfo();
+
+		if (fileInfo == NULL)
+			return -1;
+	}
 
 	if (unzOpenCurrentFile(fileToUnzip) != UNZ_OK)
 		return -2;
@@ -338,6 +350,7 @@ int UnZip::Extract(const char* path, unz_file_info_s* fileInfo)
 		done += writeBytes;
 	}
 
+	fsync(fd);
 	close(fd);
 	free(buffer);
 
diff --git a/src/ZipUtil.hpp b/src/ZipUtil.hpp
index 703ae55..e23e3c2 100644
--- a/src/ZipUtil.hpp
+++ b/src/ZipUtil.hpp
@@ -26,12 +26,12 @@ class UnZip
 	UnZip(const char* zipPath);
 	~UnZip();
 	void Close();
-	int Extract(const char* path, unz_file_info_s* fileInfo);
+	int Extract(const char* path, unz_file_info_s* fileInfo, unz_file_pos* file_pos = NULL);
 	int ExtractFile(const char* internalPath, const char* path);
 	int ExtractAll(const char* dirToExtract);
 	int ExtractDir(const char* internalDir, const char* externalDir);
 	std::vector<std::string> PathDump();
-	std::unordered_map<std::string, unz_file_info_s> GetPathToFileInfoMapping();
+	std::unordered_map<std::string, unz_file_pos> GetPathToFilePosMapping();
 
 private:
 	std::string GetFileName(unz_file_info_s* fileInfo);