+/*
+ * 2ooM: The Master of Orion II Reverse Engineering Project
+ * Library for working with LBX image 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 <assert.h>
#include <errno.h>
-#include "byteorder.h"
+#include "pack.h"
#include "misc.h"
#include "lbx.h"
#include "image.h"
#define FLAG_OVERWRITE 0x0400 /* Draw each frame on a clean slate (unsure). */
#define FLAG_PALETTE 0x1000 /* Image contains embedded palette. */
#define FLAG_LOOPING 0x2000 /* Loop over all frames in the image (unsure). */
+#define FLAG_ALL (FLAG_OVERWRITE|FLAG_PALETTE|FLAG_LOOPING)
+
+#define HDR_LEN 12
struct lbx_image {
- uint16_t width, height;
- uint16_t wtf1;
- uint16_t frames, leadin;
- uint16_t flags;
+ unsigned short width, height;
+ unsigned short wtf, flags;
+ unsigned short frames, leadin;
+ unsigned short palstart, palcount;
FILE *f;
- long foff;
+ long foff, paloff;
int currentframe;
int currentx, currenty;
unsigned char **framedata;
unsigned char **mask;
- uint32_t offsets[];
+ unsigned long offsets[];
};
+static struct lbx_image *lbximg_init(unsigned char hdr[static HDR_LEN])
+{
+ unsigned short nframes = unpack_16_le(hdr+6);
+ struct lbx_image *img;
+
+ img = malloc(sizeof *img + sizeof img->offsets[0] * (nframes+1));
+ if (!img) {
+ lbx_errno = -errno;
+ return NULL;
+ }
+
+ *img = (struct lbx_image) {
+ .width = unpack_16_le(hdr+0),
+ .height = unpack_16_le(hdr+2),
+ .wtf = unpack_16_le(hdr+4),
+ .frames = unpack_16_le(hdr+6),
+ .leadin = unpack_16_le(hdr+8),
+ .flags = unpack_16_le(hdr+10),
+
+ .currentframe = -1,
+ };
+
+ return img;
+}
+
struct lbx_image *lbximg_fopen(FILE *f)
{
- struct lbx_image tmp = {.f = f}, *new = NULL;
+ unsigned char hdr_buf[HDR_LEN];
+ struct lbx_image *img;
size_t rc;
- if (fread(&tmp.width, sizeof tmp.width, 1, f) != 1) goto readerr;
- if (fread(&tmp.height, sizeof tmp.height, 1, f) != 1) goto readerr;
- if (fread(&tmp.wtf1, sizeof tmp.wtf1, 1, f) != 1) goto readerr;
- if (fread(&tmp.frames, sizeof tmp.frames, 1, f) != 1) goto readerr;
- if (fread(&tmp.leadin, sizeof tmp.leadin, 1, f) != 1) goto readerr;
- if (fread(&tmp.flags, sizeof tmp.flags, 1, f) != 1) goto readerr;
-
- tmp.width = letohs(tmp.width); tmp.foff += sizeof tmp.width;
- tmp.height = letohs(tmp.height); tmp.foff += sizeof tmp.height;
- tmp.wtf1 = letohs(tmp.wtf1); tmp.foff += sizeof tmp.wtf1;
- tmp.frames = letohs(tmp.frames); tmp.foff += sizeof tmp.frames;
- tmp.leadin = letohs(tmp.leadin); tmp.foff += sizeof tmp.leadin;
- tmp.flags = letohs(tmp.flags); tmp.foff += sizeof tmp.flags;
-
- /* Format constraints. */
- if (tmp.frames <= tmp.leadin) {
- lbx_errno = LBX_EFORMAT;
+ if (fread(hdr_buf, 1, sizeof hdr_buf, f) != sizeof hdr_buf) {
+ lbx_errno = -errno;
+ if (feof(f))
+ lbx_errno = LBX_EEOF;
return NULL;
}
+ img = lbximg_init(hdr_buf);
+ if (!img)
+ return NULL;
+
+ img->f = f;
+ img->foff = sizeof hdr_buf;
+
/*
* DEBUG ONLY. These assertions exist to catch otherwise valid image
* files which differ from what I believe to be true of all LBX images.
* If we never find any exceptions, we can replace the assertions with
* assumptions.
*/
- _lbx_assert(tmp.wtf1 == 0);
- _lbx_assert(!(tmp.flags & ~(FLAG_PALETTE|FLAG_OVERWRITE|FLAG_LOOPING)));
+ _lbx_assert(img->wtf == 0); /* version? */
+ _lbx_assert(img->frames > img->leadin); /* cmbtshp.lbx breaks this. */
+ _lbx_assert(!(img->flags & ~FLAG_ALL));
+
+ /* Read all offsets. Should be merged with identical code in lbx.c */
+ for (unsigned i = 0; i <= img->frames; 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(img);
+ return NULL;
+ }
- new = malloc(sizeof *new + (tmp.frames+1) * sizeof *new->offsets);
- if (!new) {
- lbx_errno = -errno;
- return NULL;
+ img->offsets[i] = unpack_32_le(buf);
+ img->foff += 4;
}
- *new = tmp;
- new->currentframe = -1;
+ if (img->flags & FLAG_PALETTE) {
+ unsigned char buf[4];
- rc = fread(new->offsets, sizeof *new->offsets, new->frames+1, f);
- if (rc < new->frames+1)
- goto readerr;
- new->foff += sizeof *new->offsets * (new->frames+1);
+ if (fread(buf, 1, sizeof buf, f) != sizeof buf) {
+ lbx_errno = -errno;
+ if (feof(f))
+ lbx_errno = LBX_EEOF;
+ free(img);
+ return NULL;
+ }
- return new;
-readerr:
- if (feof(f)) {
- lbx_errno = LBX_EEOF;
- } else {
- lbx_errno = -errno;
+ img->palstart = unpack_16_le(buf+0);
+ img->palcount = unpack_16_le(buf+2);
+ img->foff += sizeof buf;
+ img->paloff = img->foff;
+
+ if (img->palstart + img->palcount > 256) {
+ lbx_errno = LBX_EFORMAT;
+ free(img);
+ return NULL;
+ }
}
- free(new);
- return NULL;
+ return img;
}
static int _lbx_drawrow(int first, struct lbx_image *img)
{
- uint16_t type, yval, count, xval;
+ unsigned short type, count, yval, xval;
+ unsigned char buf[4];
unsigned char *pos;
- unsigned char abyss;
size_t rc;
assert(img->framedata);
assert(img->mask);
- if (fread(&type, sizeof type, 1, img->f) != 1) goto readerr;
- type = letohs(type); img->foff += sizeof type;
+ if (fread(buf, 1, sizeof buf, img->f) != sizeof buf)
+ goto readerr;
+ img->foff += 4;
+ type = unpack_16_le(buf+0);
if (first) {
img->currentx = 0;
}
if (type == 0) {
- if (fread(&yval, sizeof yval, 1, img->f) != 1) goto readerr;
- yval = letohs(yval); img->foff += sizeof yval;
+ yval = unpack_16_le(buf+2);
if (yval == 1000)
return 1;
- if (fread(&count, sizeof count, 1, img->f) != 1) goto readerr;
- count = letohs(count); img->foff += sizeof count;
- if (fread(&xval, sizeof xval, 1, img->f) != 1) goto readerr;
- xval = letohs(xval); img->foff += sizeof xval;
+
+ if (fread(buf, 1, sizeof buf, img->f) != sizeof buf)
+ goto readerr;
+ img->foff += 4;
+ count = unpack_16_le(buf+0);
+
+ xval = unpack_16_le(buf+2);
if (xval == 1000)
return 1;
img->currenty += yval;
img->currentx = xval;
} else {
- if (fread(&xval, sizeof xval, 1, img->f) != 1) goto readerr;
- xval = letohs(xval); img->foff += sizeof xval;
+ xval = unpack_16_le(buf+2);
if (img->width - img->currentx <= xval) {
lbx_errno = LBX_EFORMAT;
img->currentx += xval;
count = type;
-
}
if (count > img->width - img->currentx) {
goto readerr;
if (count % 2) {
- if (fread(&abyss, 1, 1, img->f) != 1)
+ if (fread(buf, 1, 1, img->f) != 1)
goto readerr;
img->foff += 1;
}
int
lbximg_getpalette(struct lbx_image *img, struct lbx_colour palette[static 256])
{
- size_t hdrlen = 6*(sizeof img->wtf1)+(img->frames+1)*(sizeof *img->offsets);
unsigned int i;
size_t rc;
- uint16_t start, count;
uint8_t entry[4];
/* Do nothing if the image doesn't have embedded palette data. */
if (!(img->flags & FLAG_PALETTE))
return 0;
- /* Palette data is located right after the header. */
- if (_lbx_fseek(img->f, &img->foff, hdrlen) == -1)
- return -1;
-
- /* Palette header */
- if (fread(&start, sizeof start, 1, img->f) != 1) goto readerr;
- if (fread(&count, sizeof count, 1, img->f) != 1) goto readerr;
- start = letohs(start); img->foff += sizeof start;
- count = letohs(count); img->foff += sizeof count;
-
- if (start + count > 256) {
- lbx_errno = LBX_EFORMAT;
+ if (_lbx_fseek(img->f, &img->foff, img->paloff) == -1)
return -1;
- }
-
- if (hdrlen + 2*sizeof start + count*sizeof entry > img->offsets[0]) {
- lbx_errno = LBX_EFORMAT;
- return -1;
- }
- for (i = 0; i < count; i++) {
+ for (i = 0; i < img->palcount; i++) {
rc = fread(entry, 1, sizeof entry, img->f);
img->foff += rc;
return -1;
}
- palette[start + i] = (struct lbx_colour){
+ palette[img->palstart + i] = (struct lbx_colour){
.red = entry[1] << 2,
.green = entry[2] << 2,
.blue = entry[3] << 2,
.width = img->width,
.height = img->height,
.nframes = img->frames,
- .haspalette = (_Bool)(img->flags & FLAG_PALETTE),
+ .palettesz = (img->flags & FLAG_PALETTE) ? img->palcount : 0,
};
/* There seems to be two ways of specifying that an image loops. */
projects / liblbx.git / blobdiff