+/*
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
+#include <assert.h>
+
+#include <sys/stat.h>
+#include <sys/mman.h>
-#include "byteorder.h"
+#include "pack.h"
+#include "misc.h"
#include "lbx.h"
-#define LBX_MAGIC 0x0000fead
-#define MIN(a,b) (((a)<(b))?(a):(b))
+#define LBX_MAGIC 0x0000fead
+#define LBX_HDR_SIZE 8
int lbx_errno = 0;
struct lbx_state {
const char *name;
+ unsigned char *mem;
+ size_t memsize;
FILE *f;
long foff;
uint32_t offsets[];
};
+static struct lbx_state *lbx_init(unsigned char hdr[static LBX_HDR_SIZE])
+{
+ 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) {
+ lbx_errno = -LBX_EMAGIC;
+ return NULL;
+ }
+
+ lbx = malloc(sizeof *lbx + sizeof lbx->offsets[0] * (nfiles+1));
+ if (!lbx) {
+ lbx_errno = -errno;
+ return NULL;
+ }
+
+ *lbx = (struct lbx_state) {
+ .nfiles = nfiles,
+ };
+
+ return lbx;
+}
+
struct lbx_state *lbx_fopen(FILE *f, const char *name)
+{
+ unsigned char hdr_buf[LBX_HDR_SIZE];
+ struct lbx_state *lbx;
+
+ if (fread(hdr_buf, 1, sizeof hdr_buf, f) != sizeof hdr_buf) {
+ lbx_errno = -errno;
+ return NULL;
+ }
+
+ lbx = lbx_init(hdr_buf);
+ if (!lbx)
+ return NULL;
+
+ lbx->name = name;
+ lbx->f = f;
+ lbx->foff = sizeof hdr_buf;
+
+ for (unsigned i = 0; i <= lbx->nfiles; i++) {
+ unsigned char buf[4];
+
+ if (fread(buf, 1, sizeof buf, f) != sizeof buf) {
+ lbx_errno = -errno;
+ if (feof(f))
+ lbx_errno = LBX_EEOF;
+ free(lbx);
+ return NULL;
+ }
+
+ lbx->offsets[i] = unpack_32_le(buf);
+ lbx->foff += sizeof buf;
+ }
+
+ return lbx;
+}
+
+static int _lbx_memcpy(void *dest, struct lbx_state *src, size_t size)
+{
+ if (src->foff + size > src->memsize)
+ return -1;
+ memcpy(dest, src->mem + src->foff, size);
+ src->foff += size;
+ return 0;
+}
+
+struct lbx_state *lbx_mopen(void *_mem, size_t size, const char *name)
{
struct lbx_state *new = NULL;
+ struct lbx_state tmp = { .mem = _mem, .memsize = size };
uint16_t nfiles, version;
uint32_t magic;
- if (fread(&nfiles, sizeof nfiles, 1, f) != 1) goto readerr;
- if (fread(&magic, sizeof magic, 1, f) != 1) goto readerr;
- if (fread(&version, sizeof version, 1, f) != 1) goto readerr;
+ if (_lbx_memcpy(&nfiles, &tmp, sizeof nfiles) == -1) goto eof;
+ if (_lbx_memcpy(&magic, &tmp, sizeof magic) == -1) goto eof;
+ if (_lbx_memcpy(&version, &tmp, sizeof version) == -1) goto eof;
nfiles = letohs(nfiles);
magic = letohl(magic);
}
*new = (struct lbx_state){
- .name = name,
- .nfiles = nfiles,
- .f = f,
- .foff = sizeof nfiles + sizeof magic + sizeof version,
+ .name = name,
+ .nfiles = nfiles,
+ .mem = _mem,
+ .memsize = size,
+ .foff = tmp.foff,
};
- if (fread(new->offsets, sizeof *new->offsets, nfiles+1, f) != nfiles+1)
- goto readerr;
- new->foff += sizeof *new->offsets * (nfiles+1);
+ if (_lbx_memcpy(new->offsets, new, (nfiles+1)*(sizeof *new->offsets)))
+ goto eof;
return new;
-readerr:
- if (feof(f)) {
- lbx_errno = LBX_EEOF;
- } else {
- lbx_errno = -errno;
- }
-
+eof:
free(new);
+ lbx_errno = LBX_EEOF;
return NULL;
}
-struct lbx_state *lbx_open(const char *path)
-{
- struct lbx_state *new = NULL;
- FILE *f;
-
- if ((f = fopen(path, "rb"))) {
- const char *name = strrchr(path, '/');
- new = lbx_fopen(f, name ? name+1 : path);
- } else {
- lbx_errno = -errno;
- }
-
- return new;
-}
-
size_t lbx_numfiles(struct lbx_state *lbx)
{
return lbx->nfiles;
return -1;
}
- snprintf(str, sizeof str, "%s.%03d", lbx->name, index);
+ snprintf(str, sizeof str, "%s.%03zu", lbx->name, index);
buf->name = str;
buf->size = lbx->offsets[index+1] - lbx->offsets[index];
return 0;
}
-/* Advance to the beginning of the index'th file by either fseek or reading. */
-static int _lbx_fseek(struct lbx_state *lbx, size_t base)
+static size_t
+_lbx_mextract(struct lbx_state *lbx, size_t base, size_t len, FILE *of)
{
- static unsigned char oblivion[1024];
- long dist;
-
- if (lbx->foff < base) {
- dist = base - lbx->foff;
- } else if (lbx->foff > base) {
- dist = -(long)(lbx->foff - base);
- } else {
- return 0;
- }
+ size_t rc;
- if (fseek(lbx->f, dist, SEEK_CUR) == 0) {
- lbx->foff += dist;
- } else if (lbx->foff < base) {
- while (dist) {
- size_t rc, amt = MIN(sizeof oblivion, dist);
- rc = fread(oblivion, 1, amt, lbx->f);
- lbx->foff += rc;
- dist -= rc;
- if (rc < amt) {
- if (feof(lbx->f))
- lbx_errno = LBX_EEOF;
- else
- lbx_errno = -errno;
- return -1;
- }
- }
- } else {
+ assert(lbx->mem);
+ assert(base + len <= lbx->memsize);
+
+ rc = fwrite(lbx->mem + base, 1, len, of);
+ if (rc < len)
lbx_errno = -errno;
- return -1;
- }
- return 0;
+
+ return rc;
}
-size_t lbx_extract(struct lbx_state *lbx, size_t index, FILE *of)
+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, base, len;
+ size_t rc, written = 0;
- if (index >= lbx->nfiles) {
- lbx_errno = LBX_ERANGE;
- return 0;
- }
-
- base = lbx->offsets[index];
- len = lbx->offsets[index+1] - lbx->offsets[index];
+ assert(lbx->f);
- if (_lbx_fseek(lbx, base) == -1) {
- /* lbx_errno set by _lbx_fseek(). */
+ if (_lbx_fseek(lbx->f, &lbx->foff, base) == -1)
return 0;
- }
-
- /* Copy file data */
+
while (len) {
- size_t amt = MIN(sizeof buf, len);
+ size_t amt = MIN(len, sizeof buf);
rc = fread(buf, 1, amt, lbx->f);
lbx->foff += rc;
len -= rc;
if (rc < amt) {
- if (feof(lbx->f)) {
- lbx_errno = LBX_EEOF;
- } else {
- lbx_errno = -errno;
- }
+ if (feof(lbx->f)) lbx_errno = LBX_EEOF;
+ else lbx_errno = -errno;
break;
}
return written;
}
-void lbx_close(struct lbx_state *lbx)
+size_t lbx_extract(struct lbx_state *lbx, size_t index, FILE *of)
+{
+ 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];
+
+ if (lbx->mem)
+ return _lbx_mextract(lbx, base, len, of);
+ return _lbx_fextract(lbx, base, len, of);
+}
+
+int lbx_close(struct lbx_state *lbx)
{
- if (!lbx) return;
+ int rc = 0;
+
+ if (!lbx)
+ return 0;
+
+ if (lbx->f)
+ rc = fclose(lbx->f);
- fclose(lbx->f);
free(lbx);
+ return rc;
}
const char *lbx_strerror(void)
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";
projects / liblbx.git / blobdiff