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28 uint32_t magic; /* "PACK" */
31 * Offset to first directory entry in PAK file. It's often
32 * best to store the directories at the end of the file opposed
33 * to the front, since it allows easy insertion without having
34 * to load the entire file into memory again.
41 * A directory, is sort of a "file entry". The concept of
42 * a directory in Quake world is a "file entry/record". This
43 * describes a file (with directories/nested ones too in it's
44 * file name). Hence it can be a file, file with directory, or
45 * file with directories.
54 * Used to get the next token from a string, where the
55 * strings themselfs are seperated by chracters from
56 * `sep`. This is essentially strsep.
58 static char *pak_tree_sep(char **str, const char *sep) {
65 if (*(end = beg + strcspn(beg, sep)))
66 * end++ = '\0'; /* null terminate */
75 * Used to spawn a directory when creating the pak directory structure/
76 * tree. Think of this as mkdir(path, 0700). We just cargo cult our
77 * own because _mkdir on windows is "illegal" for Windows8 Certification
78 * do to the requirement of SECURITY_ATTRIBUTES on everything.
80 static bool pak_tree_spawn(const char *path) {
82 return CreateDirectoryA(path, NULL); /* non-zero on success */
84 return !!(mkdir(path, 0700)); /* zero on success */
89 * When given a string like "a/b/c/d/e/file"
90 * this function will handle the creation of
91 * the directory structure, included nested
94 static void pak_tree_build(const char *entry) {
103 pathsplit = mem_a(56);
104 directory = mem_a(56);
106 memset(pathsplit, 0, 56);
107 memset(directory, 0, 56);
109 strncpy(directory, entry, 56);
110 for (itr = 0; (token = strsep(&directory, "/")) != NULL; itr++) {
111 elements[itr] = token;
114 for (jtr = 0; jtr < itr - 1; jtr++) {
115 strcat(pathsplit, elements[jtr]);
116 strcat(pathsplit, "/");
118 pak_tree_spawn(pathsplit);
126 pak_directory_t *directories;
132 pak_file_t *pak_open_read(const char *file) {
136 if (!(pak = mem_a(sizeof(pak_file_t))))
139 if (!(pak->handle = file_open(file, "rb"))) {
144 pak->directories = NULL;
145 pak->insert = false; /* read doesn't allow insert */
147 memset (&pak->header, 0, sizeof(pak_header_t));
148 file_read (&pak->header, sizeof(pak_header_t), 1, pak->handle);
149 util_endianswap(&pak->header, 1, sizeof(pak_header_t));
152 * Every PAK file has "PACK" stored as little endian data in the
153 * header. If this data cannot compare (as checked here), it's
154 * probably not a PAK file.
156 if ((memcmp(&(pak->header.magic), (const void*)"PACK", sizeof(uint32_t)))) {
157 file_close(pak->handle);
163 * Time to read in the directory handles and prepare the directories
164 * vector. We're going to be reading some the file inwards soon.
166 file_seek(pak->handle, pak->header.diroff, SEEK_SET);
169 * Read in all directories from the PAK file. These are considered
170 * to be the "file entries".
172 for (itr = 0; itr < pak->header.dirlen / 64; itr++) {
174 file_read (&dir, sizeof(pak_directory_t), 1, pak->handle);
175 /*util_endianswap(&dir, 1, sizeof(pak_directory_t));*/
177 vec_push(pak->directories, dir);
182 pak_file_t *pak_open_write(const char *file) {
185 if (!(pak = mem_a(sizeof(pak_file_t))))
189 * Generate the required directory structure / tree for
190 * writing this PAK file too.
192 pak_tree_build(file);
194 if (!(pak->handle = file_open(file, "wb"))) {
196 * The directory tree that was created, needs to be
197 * removed entierly if we failed to open a file.
199 /* TODO backup directory clean */
204 memset(&(pak->header), 0, sizeof(pak_header_t));
207 * We're in "insert" mode, we need to do things like header
208 * "patching" and writing the directories at the end of the
214 * A valid PAK file contains the magic "PACK" in it's header
215 * stored in little endian format.
217 memcpy(&(pak->header.magic), (const void*)"PACK", sizeof(uint32_t));
220 * We need to write out the header since files will be wrote out to
221 * this even with directory entries, and that not wrote. The header
222 * will need to be patched in later with a file_seek, and overwrite,
223 * we could use offsets and other trickery. This is just easier.
225 file_write(&(pak->header), sizeof(pak_header_t), 1, pak->handle);
230 bool pak_exists(pak_file_t *pak, const char *file, pak_directory_t **dir) {
237 * We could technically use a hashtable here. But I don't think
238 * the lookup complexity is a performance concern. This may be
239 * O(n) lookup. But meh?
241 for (itr = 0; itr < vec_size(pak->directories); itr++) {
242 if (!strcmp(pak->directories[itr].name, file)) {
244 * Store back a pointer to the directory that matches
245 * the request if requested (NULL is not allowed).
248 *dir = &(pak->directories[itr]);
258 * Extraction abilities. These work as you expect them to.
260 bool pak_extract_one(pak_file_t *pak, const char *file) {
261 pak_directory_t *dir = NULL;
262 unsigned char *dat = NULL;
265 if (!pak_exists(pak, file, &dir)) {
269 if (!(dat = (unsigned char *)mem_a(dir->len))) {
274 * Generate the directory structure / tree that will be required
275 * to store the extracted file.
277 pak_tree_build(file);
280 * Now create the file, if this operation fails. Then abort
281 * It shouldn't fail though.
283 if (!(out = file_open(file, "wb"))) {
290 file_seek (pak->handle, dir->pos, SEEK_SET);
291 file_read (dat, 1, dir->len, pak->handle);
294 file_write(dat, 1, dir->len, out);
305 bool pak_extract_all(pak_file_t *pak) {
307 for (itr = 0; itr < vec_size(pak->directories); itr++) {
308 if (!pak_extract_one(pak, pak->directories[itr].name))
316 * Insertion functions (the opposite of extraction). Yes for generating
319 bool pak_insert_one(pak_file_t *pak, const char *file) {
325 * We don't allow insertion on files that already exist within the
326 * pak file. Weird shit can happen if we allow that ;). We also
327 * don't allow insertion if the pak isn't opened in write mode.
329 if (!pak || !file || !pak->insert || pak_exists(pak, file, NULL))
332 if (!(fp = fopen(file, "rb")))
336 * Calculate the total file length, since it will be wrote to
337 * the directory entry, and the actual contents of the file
338 * to the PAK file itself.
340 file_seek(fp, 0, SEEK_END);
342 file_seek(fp, 0, SEEK_SET);
344 dir.pos = ftell(pak->handle);
347 * Allocate some memory for loading in the data that will be
348 * redirected into the PAK file.
350 if (!(dat = (unsigned char *)mem_a(dir.len))) {
355 file_read (dat, dir.len, 1, fp);
357 file_write(dat, dir.len, 1, pak->handle);
363 * Like pak_insert_one, except this collects files in all directories
364 * from a root directory, and inserts them all.
366 bool pak_insert_all(pak_file_t *pak, const char *dir) {
373 if (!(dp = opendir(dir)))
376 while ((dirp = readdir(dp))) {
377 if (!(pak_insert_one(pak, dirp->d_name))) {
387 bool pak_close(pak_file_t *pak) {
394 * In insert mode we need to patch the header, and write
395 * our directory entries at the end of the file.
398 pak->header.dirlen = vec_size(pak->directories) * 64;
399 pak->header.diroff = ftell(pak->handle);
402 file_seek (pak->handle, 0, SEEK_SET);
403 file_write(&(pak->header), sizeof(pak_header_t), 1, pak->handle);
405 /* write directories */
406 file_seek (pak->handle, pak->header.diroff, SEEK_SET);
408 for (itr = 0; itr < vec_size(pak->directories); itr++) {
409 file_write(&(pak->directories[itr]), sizeof(pak_directory_t), 1, pak->handle);
413 vec_free (pak->directories);
414 file_close(pak->handle);
420 /* test extraction */
423 pak_file_t *pak = pak_open_read("pak0.pak");
426 pak_extract_all(pak);