mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-06 13:11:20 +00:00
91 lines
1.8 KiB
C
91 lines
1.8 KiB
C
#include <limits.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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/*
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Structs for pack files on disk
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*/
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#define PAK_PATH_LENGTH 56
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typedef struct {
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char name[PAK_PATH_LENGTH];
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int filepos, filelen;
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} dpackfile_t;
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typedef struct {
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char id[4];
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int dirofs;
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int dirlen;
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} dpackheader_t;
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#define MAX_FILES_IN_PACK 2048
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typedef struct pack_s {
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char filename[MAX_PATH];
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FILE *handle;
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int numfiles;
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int files_size;
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dpackfile_t *files;
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} pack_t;
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pack_t *
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new_pack (const char *name)
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{
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pack_t *pack = calloc (sizeof (*pack), 1);
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if (!pack)
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return 0;
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strncpy (pack->filename, name, sizeof (pack->filename));
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pack->filename[sizeof (pack->filename) - 1] = 0;
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return pack;
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}
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void
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del_pack (pack_t *pack)
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{
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if (pack->files)
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free (pack->files);
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if (pack->handle)
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fclose (pack->handle);
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free (pack);
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}
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pack_t *
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open_pack (const char *name)
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{
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dpackheader_t header;
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pack_t *pack = new_pack (name);
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if (!pack)
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return 0;
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pack->handle = fopen (name, "rb");
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if (!pack->handle) {
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goto error;
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}
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if (fread (&header, sizeof (header), 1, pack->handle) != sizeof (header)) {
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fprintf (stderr, "%s: not a pack file", name);
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goto error;
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}
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if (strncmp (header.id, "PACK", 4)) {
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fprintf (stderr, "%s: not a pack file", name);
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goto error;
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}
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pack->numfiles = header.dirlen / sizeof (dpackfile_t);
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pack->files_size = pack->numfiles;
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if (pack->numfiles > MAX_FILES_IN_PACK) {
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fprintf (stderr, "%s: too many files in pack: %d", name, pack->numfiles);
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goto error;
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}
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pack->files = malloc (numpackfiles * sizeof (packfile_t));
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if (!pack->files) {
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fprintf (stderr, "out of memory\n");
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goto error;
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}
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fseek (pack->handle, header.diroffs, SEEK_POS);
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fread (pack->files, pack->numfiles, sizeof (pack->files[0]), pack->handle);
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error:
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del_pack (pack);
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return 0;
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}
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