acorn_to_png.swift

import SQLite3
import Foundation

func main(dbPath: String) {
    // Pointer for database connection
    var db: OpaquePointer?
    
    // Open database
    guard sqlite3_open(dbPath, &db) == SQLITE_OK else {
        print("Error opening database: \(String(cString: sqlite3_errmsg(db)))")
        return
    }
    
    defer { sqlite3_close(db) }
    
    // Prepare query
    let query = "SELECT value FROM image_attributes WHERE name = 'composite'"
    var statement: OpaquePointer?
    
    guard sqlite3_prepare_v2(db, query, -1, &statement, nil) == SQLITE_OK else {
        print("Error preparing query: \(String(cString: sqlite3_errmsg(db)))")
        return
    }
    
    defer { sqlite3_finalize(statement) }
    
    // Execute query and get result
    if sqlite3_step(statement) == SQLITE_ROW {
        // Get blob data
        if let blob = sqlite3_column_blob(statement, 0) {
            let blobLength = sqlite3_column_bytes(statement, 0)
            
            // Convert blob to Data
            let data = Data(bytes: blob, count: Int(blobLength))
            
            // Write to file
            let outputPath = "/tmp/foo.png"
            do {
                try data.write(to: URL(fileURLWithPath: outputPath))
                print("Successfully wrote data to \(outputPath)")
            } catch {
                print("Error writing to file: \(error)")
            }
        } else {
            print("No blob data found")
        }
    } else {
        print("No results found or query error")
    }
}

// Check for command-line argument
guard CommandLine.arguments.count > 1 else {
    print("Usage: \(CommandLine.arguments[0]) <database_path>")
    exit(1)
}

// Run with provided database path
main(dbPath: CommandLine.arguments[1])