X-Git-Url: http://git.draconx.ca/gitweb/liblbx.git/blobdiff_plain/b42e3c4eadf05be2506e1a1f8deb2cf24064c18b..298bb41d24f304bdc9c46c29cfe0f6c06d4b44de:/src/lbx.c?ds=sidebyside
diff --git a/src/lbx.c b/src/lbx.c
index 481123b..4b5d7f3 100644
--- a/src/lbx.c
+++ b/src/lbx.c
@@ -1,63 +1,215 @@
+/*
+ * 2ooM: The Master of Orion II Reverse Engineering Project
+ * Library for working with LBX archive files.
+ * Copyright (C) 2006-2008 Nick Bowler
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ */
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
#include
#include
+#include
#include
+#include
+#include
+
+#include
+#include
-#include "byteorder.h"
+#include "pack.h"
+#include "misc.h"
#include "lbx.h"
-#define LBX_MAGIC 0x0000fead
+#define LBX_MAGIC 0x0000fead
+#define LBX_HDR_SIZE 8
+
+int lbx_errno = 0;
struct lbx_state {
- FILE *f;
+ const char *name;
+
+ const struct lbx_file_ops *fops;
+ int (*dtor)(void *handle);
+ void *f;
+
uint16_t nfiles;
uint32_t offsets[];
};
-struct lbx_state *lbx_fopen(FILE *f)
+static struct lbx_state *lbx_init(unsigned char hdr[static LBX_HDR_SIZE])
{
- struct lbx_state *new = NULL;
- uint16_t nfiles, version;
- uint32_t magic;
-
- if (fread(&nfiles, sizeof nfiles, 1, f) != 1) return NULL;
- if (fread(&magic, sizeof magic, 1, f) != 1) return NULL;
- if (fread(&version, sizeof version, 1, f) != 1) return NULL;
-
- nfiles = letohs(nfiles);
- magic = letohl(magic);
- version = letohs(version);
+ unsigned short nfiles = unpack_16_le(hdr+0);
+ unsigned long magic = unpack_32_le(hdr+2);
+ unsigned short version = unpack_16_le(hdr+6);
+ struct lbx_state *lbx;
- if (magic != LBX_MAGIC)
+ if (magic != LBX_MAGIC) {
+ lbx_errno = -LBX_EMAGIC;
return NULL;
-
- new = malloc(sizeof *new + (nfiles+1)*(sizeof *new->offsets));
- if (!new)
+ }
+
+ lbx = malloc(sizeof *lbx + sizeof lbx->offsets[0] * (nfiles+1));
+ if (!lbx) {
+ lbx_errno = -errno;
return NULL;
-
- *new = (struct lbx_state){
+ }
+
+ *lbx = (struct lbx_state) {
.nfiles = nfiles,
- .f = f,
};
-
- if (fread(new->offsets, sizeof *new->offsets, nfiles+1, f) != nfiles+1)
- return free(new), NULL;
- return new;
+ return lbx;
+}
+
+struct lbx_state *lbx_open(void *f, const struct lbx_file_ops *fops,
+ int (*destructor)(void *), const char *name)
+{
+ unsigned char hdr_buf[LBX_HDR_SIZE];
+ struct lbx_state *lbx;
+
+ if (fops->read(hdr_buf, sizeof hdr_buf, f) != sizeof hdr_buf) {
+ lbx_errno = -errno;
+ return NULL;
+ }
+
+ lbx = lbx_init(hdr_buf);
+ if (!lbx)
+ return NULL;
+
+ lbx->dtor = destructor;
+ lbx->name = name;
+ lbx->fops = fops;
+ lbx->f = f;
+
+ for (unsigned i = 0; i <= lbx->nfiles; i++) {
+ unsigned char buf[4];
+
+ if (fops->read(buf, sizeof buf, f) != sizeof buf) {
+ lbx_errno = -errno;
+ if (fops->eof(f))
+ lbx_errno = LBX_EEOF;
+ free(lbx);
+ return NULL;
+ }
+
+ lbx->offsets[i] = unpack_32_le(buf);
+ }
+
+ return lbx;
}
-struct lbx_state *lbx_open(const char *path)
+struct lbx_state *lbx_fopen(FILE *f, const char *name)
{
- struct lbx_state *new = NULL;
- FILE *f;
+ return lbx_open(f, &lbx_default_fops, NULL, name);
+}
+
+size_t lbx_numfiles(struct lbx_state *lbx)
+{
+ return lbx->nfiles;
+}
+
+int lbx_stat(struct lbx_state *lbx, size_t index, struct lbx_statbuf *buf)
+{
+ static char str[256]; /* FIXME */
+
+ if (index >= lbx->nfiles) {
+ buf->name = NULL;
+ lbx_errno = LBX_ERANGE;
+ return -1;
+ }
+
+ snprintf(str, sizeof str, "%s.%03zu", lbx->name, index);
+ buf->name = str;
+ buf->size = lbx->offsets[index+1] - lbx->offsets[index];
+ return 0;
+}
+
+static size_t
+_lbx_fextract(struct lbx_state *lbx, size_t base, size_t len, FILE *of)
+{
+ unsigned char buf[1024];
+ size_t rc, written = 0;
+
+ assert(lbx->f);
+
+ if (lbx->fops->seek(lbx->f, base, SEEK_SET) != 0) {
+ lbx_errno = -errno;
+ return 0;
+ }
- if ((f = fopen(path, "rb")))
- new = lbx_fopen(f);
+ while (len) {
+ size_t amt = MIN(len, sizeof buf);
+
+ rc = lbx->fops->read(buf, amt, lbx->f);
+ len -= rc;
+ if (rc < amt) {
+ if (lbx->fops->eof(lbx->f)) lbx_errno = LBX_EEOF;
+ else lbx_errno = -errno;
+ break;
+ }
+
+ rc = fwrite(buf, 1, amt, of);
+ written += rc;
+ if (rc < amt) {
+ lbx_errno = -errno;
+ break;
+ }
+ }
- return new;
+ return written;
}
-void lbx_close(struct lbx_state *lbx)
+size_t lbx_extract(struct lbx_state *lbx, size_t index, FILE *of)
{
- fclose(lbx->f);
+ size_t base, len;
+
+ if (index >= lbx->nfiles) {
+ lbx_errno = LBX_ERANGE;
+ return 0;
+ }
+
+ base = lbx->offsets[index];
+ len = lbx->offsets[index+1] - lbx->offsets[index];
+ return _lbx_fextract(lbx, base, len, of);
+}
+
+int lbx_close(struct lbx_state *lbx)
+{
+ int rc = 0;
+
+ if (lbx && lbx->dtor)
+ rc = lbx->dtor(lbx->f);
free(lbx);
+
+ return rc;
+}
+
+const char *lbx_strerror(void)
+{
+ if (lbx_errno < 0)
+ return strerror(-lbx_errno);
+
+ switch (lbx_errno) {
+ case LBX_ESUCCESS: return "Success";
+ case LBX_EMAGIC: return "Bad magic number";
+ case LBX_EEOF: return "Unexpected end-of-file";
+ case LBX_ERANGE: return "Index out of range";
+ case LBX_EFORMAT: return "Invalid file format";
+ }
+
+ return "Unknown error";
}