Loading Zipped Files with SDL

wyrzy · 2004-12-24T08:45:39

Has anyone been able to load files within a .zip folder into an SDL Surface*? I looked at the tutorial here: http://www.kekkai.org/roger/sdl/rwops/rwops.html (Part 3), but I was receiving errors when opening the file. It uses ZZipLib and ZLib (I downloaded the pre-built binaries and header files). I'm using the following code to open the file inside a .zip folder: char *filename = "data/credits.bmp";//path to the a zipped image SDL_RWops *rw; //a SDL Read/Write Operations Ptr ZZIP_FILE *file; // ZZIP_FILE is the zzip equivalent of the stdio FILE. file = zzip_open(filename, 0);//almost like fopen() except the 2 parameter is unused // !!! THIS IF STATEMENT RETURNS TRUE, MEANING zzip_open() returned NULL if(file == NULL) { printf("FILE ptr is NULL\n"); throw; } int filesize = 0;//this will store the file's actual size //create a buffer of size bytes const int bytes = 800*600*4; //Uint8 char *buffer = new char[bytes]; //now decompress the file, and record the filesize filesize = zzip_read( file, buffer, bytes ); rw = SDL_RWFromMem(buffer, filesize); if( rw == NULL ) { puts("RW is Null"); throw; } SDL_Surface *temp1; temp1 = IMG_Load_RW(rw, 0); The problem is that zzip_open keeps on returning NULL even though there is a folder in my current directory called data.zip with a file named credits.bmp in it. Has anyone used the zzip_lib for reading in files in a zip folder? Also, if you wondering why the path isn't specified to data.zip/credits.bmp, the documentation for ZZipLib says that: Quote: It has some magic functionality builtin - it will first try to open the given filename as a normal file. If it does not exist, the given path to the filename (if any) is split into its directory-part and the file-part. A ".zip" extension is then added to the directory-part to create the name of a zip-archive. That zip-archive (if it exists) is being searched for the file-part, and if found a zzip-handle is returned. which I interpreted as: "If a real folder with the name you specify exists, then that folder will try to be opened, Else the folder the the name+".zip" will try to be opened." I have already tried adding the .zip extension, but I get the same error. Also, when I leave the "data" folder unzipped, all the images load in successfully. Note: (If a Mod is reading this) I wasn't sure if I should post this in Game Programming or Here, as it does use SDL_RWops but that really isn't my problem.

Engines and Middleware Programming

Started by wyrzy December 21, 2004 11:21 AM

11 comments, last by wyrzy 20 years, 2 months ago

Drew_Benton

1,865

December 24, 2004 12:12 AM

Quote:
Original post by Think128
Isn't loading things from a zip file slow?

Repeated yes, as is loading anything repeatedly. The trick is to load once and store into memory. Other than that, not really - loading via .dll's are said to be slow, but you can't really tell the performance difference. Now if you had a huge zip file - you would need an optimized system, but as before, if you have a huge files to begin with - your not adding too much overhead.

wyrzy

Author

430

December 24, 2004 08:45 AM

Quote:
Original post by Think128
Isn't loading things from a zip file slow?

It adds about less than a half a second *EDIT*for my game*EDIT*. I have over 26MB of game assets, but I only load about 8MB on start up. I've heard that Quake III loads from .zip folders as well, as the pak files are just a .zip folder with the name of the extenstion changed.

Loading Zipped Files with SDL

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