ref: 74414b91d904eb3c7c9fa084695178c1387cd7d0
dir: /src/allegro/packfile.c/
/* _______ ____ __ ___ ___ * \ _ \ \ / \ / \ \ / / ' ' ' * | | \ \ | | || | \/ | . . * | | | | | | || ||\ /| | * | | | | | | || || \/ | | ' ' ' * | | | | | | || || | | . . * | |_/ / \ \__// || | | * /_______/ynamic \____/niversal /__\ /____\usic /| . . ibliotheque * / \ * / . \ * packfile.c - Packfile input module. / / \ \ * | < / \_ * By entheh. | \/ /\ / * \_ / > / * Note that this does not use file compression; | \ / / * for that you must open the file yourself and | ' / * then use dumbfile_open_packfile(). \__/ */ #include <allegro.h> #include "aldumb.h" typedef struct dumb_packfile { PACKFILE *p; long size; long pos; } dumb_packfile; static void *dumb_packfile_open_ex(PACKFILE *p, long size) { dumb_packfile *file = (dumb_packfile *)malloc(sizeof(dumb_packfile)); if (!file) return 0; file->p = p; file->size = size; file->pos = 0; return file; } static void *dumb_packfile_open(const char *filename) { PACKFILE *p = pack_fopen(filename, F_READ); if (p) return dumb_packfile_open_ex(p, file_size_ex(filename)); else return 0; } static int dumb_packfile_skip(void *f, dumb_off_t n) { dumb_packfile *file = (dumb_packfile *)f; file->pos += n; return pack_fseek(file->p, file->pos); } static int dumb_packfile_getc(void *f) { dumb_packfile *file = (dumb_packfile *)f; int c = pack_getc(file->p); if (c != EOF) file->pos++; return c; } static dumb_ssize_t dumb_packfile_getnc(char *ptr, size_t n, void *f) { dumb_packfile *file = (dumb_packfile *)f; errno = 0; long nr = pack_fread(ptr, n, file->p); if (nr > 0) { file->pos += nr; return nr; } return errno != 0 ? -1 : 0; } static void dumb_packfile_close(void *f) { dumb_packfile *file = (dumb_packfile *)f; pack_fclose(file->p); free(f); } static void dumb_packfile_noclose(void *f) { free(f); } static int dumb_packfile_seek(void *f, dumb_off_t n) { dumb_packfile *file = (dumb_packfile *)f; file->pos = n; return pack_fseek(file->p, n); } static dumb_off_t dumb_packfile_get_size(void *f) { dumb_packfile *file = (dumb_packfile *)f; return file->size; } static DUMBFILE_SYSTEM packfile_dfs = { &dumb_packfile_open, &dumb_packfile_skip, &dumb_packfile_getc, &dumb_packfile_getnc, &dumb_packfile_close, &dumb_packfile_seek, &dumb_packfile_get_size}; void dumb_register_packfiles(void) { register_dumbfile_system(&packfile_dfs); } static DUMBFILE_SYSTEM packfile_dfs_leave_open = {NULL, &dumb_packfile_skip, &dumb_packfile_getc, &dumb_packfile_getnc, &dumb_packfile_noclose, &dumb_packfile_seek, &dumb_packfile_get_size}; /* XXX no way to get the file size from an existing PACKFILE without reading the * entire contents first */ DUMBFILE *dumbfile_open_packfile(PACKFILE *p) { return dumbfile_open_ex(dumb_packfile_open_ex(p, 0x7fffffff), &packfile_dfs_leave_open); } DUMBFILE *dumbfile_from_packfile(PACKFILE *p) { return p ? dumbfile_open_ex(dumb_packfile_open_ex(p, 0x7fffffff), &packfile_dfs) : NULL; }