From 0806586ee10e29b60a77c351d355a00087f81f57 Mon Sep 17 00:00:00 2001
From: Nick Bowler <draconx@gmail.com>
Date: Sat, 29 Dec 2007 14:28:31 -0500
Subject: [PATCH] Start adding image support to liblbx.

---
 src/Makefile.am |  2 +-
 src/image.c     | 80 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/image.h     | 11 +++++++
 3 files changed, 92 insertions(+), 1 deletion(-)
 create mode 100644 src/image.c
 create mode 100644 src/image.h

diff --git a/src/Makefile.am b/src/Makefile.am
index d1ddaf2..6867d30 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -2,7 +2,7 @@ lib_LTLIBRARIES   = liblbx.la
 bin_PROGRAMS      = lbxtool
 include_HEADERS   = lbx.h
 
-liblbx_la_SOURCES = byteorder.h lbx.c
+liblbx_la_SOURCES = byteorder.h lbx.c image.c
 
 lbxtool_SOURCES   = lbxtool.c
 lbxtool_LDADD     = liblbx.la
diff --git a/src/image.c b/src/image.c
new file mode 100644
index 0000000..86f6f98
--- /dev/null
+++ b/src/image.c
@@ -0,0 +1,80 @@
+#ifdef HAVE_CONFIG_H
+#	include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <assert.h>
+#include <errno.h>
+
+#include "lbx.h"
+#include "byteorder.h"
+
+struct lbx_image {
+	FILE *f;
+	uint16_t width, height;
+	uint16_t wtf1, wtf2;
+	uint16_t offs, frames;
+	uint32_t offsets[];
+};
+
+struct lbx_image *lbximg_fopen(FILE *f)
+{
+	struct lbx_image tmp = {.f = f}, *new;
+
+	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.offs,   sizeof tmp.offs,    1, f) != 1) goto readerr;
+	if (fread(&tmp.frames, sizeof tmp.frames,  1, f) != 1) goto readerr;
+	if (fread(&tmp.wtf2,   sizeof tmp.wtf2,    1, f) != 1) goto readerr;
+
+	tmp.width  = letohs(tmp.width);
+	tmp.height = letohs(tmp.height);
+	tmp.wtf1   = letohs(tmp.wtf1);
+	tmp.offs   = letohs(tmp.offs);
+	tmp.frames = letohs(tmp.frames);
+	tmp.wtf2   = letohs(tmp.wtf2);
+
+	/*
+	 * 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.
+	 */
+	assert(tmp.wtf1 == 0);
+	assert(tmp.offs == tmp.frames + 1);
+
+	new = malloc(sizeof *new + tmp.offs * sizeof *new->offsets);
+	if (!new) {
+		lbx_errno = -errno;
+		return NULL;
+	}
+
+	*new = tmp;
+
+	if (fread(new->offsets, sizeof *new->offsets, new->offs, f) != new->offs)
+		goto readerr;
+
+	return new;
+readerr:
+	if (feof(f)) {
+		lbx_errno = LBX_EEOF;
+	} else {
+		lbx_errno = -errno;
+	}
+
+	free(new);
+	return NULL;
+}
+
+void lbximg_close(struct lbx_image *img)
+{
+	if (!img) return;
+
+	if (img->f) {
+		fclose(img->f);
+	}
+
+	free(img);
+}
diff --git a/src/image.h b/src/image.h
new file mode 100644
index 0000000..5b5e4a3
--- /dev/null
+++ b/src/image.h
@@ -0,0 +1,11 @@
+#ifndef LBXIMG_H_
+#define LBXIMG_H_
+
+#include <stdio.h>
+
+typedef struct lbx_image LBXIMG;
+
+LBXIMG *lbximg_fopen(FILE *f);
+void    lbximg_close(LBXIMG *img);
+
+#endif
-- 
2.43.2