From 64875e9fda7bf0c78a535e9ea354c37d8f113019 Mon Sep 17 00:00:00 2001
From: Campbell Barton <ideasman42@gmail.com>
Date: Wed, 14 Jul 2010 20:31:11 +0000
Subject: - change blend thumbnail loading function not to use goto's - fix for
 some warnings

---
 source/blender/imbuf/intern/thumbs_blend.c | 125 +++++++++++++++++------------
 1 file changed, 74 insertions(+), 51 deletions(-)

(limited to 'source/blender/imbuf/intern/thumbs_blend.c')

diff --git a/source/blender/imbuf/intern/thumbs_blend.c b/source/blender/imbuf/intern/thumbs_blend.c
index c5c853f0c93..2b55e87546a 100644
--- a/source/blender/imbuf/intern/thumbs_blend.c
+++ b/source/blender/imbuf/intern/thumbs_blend.c
@@ -37,54 +37,60 @@
 
 /* extracts the thumbnail from between the 'REND' and the 'GLOB'
  * chunks of the header, dont use typical blend loader because its too slow */
-ImBuf *IMB_loadblend_thumb(const char *path)
+
+static ImBuf *loadblend_thumb(gzFile gzfile)
 {
 	char buf[8];
 	int code= 0;
 	char endian, pointer_size;
 	char endian_switch;
 	int len, im_len, x, y;
-	int *rect= NULL;
+	ImBuf *img= NULL;
 
-	gzFile gzfile;
-	
-	ImBuf *img;
-	
-	/* not necessarily a gzip */
-	gzfile = gzopen(path, "rb");
 
-	if (NULL == gzfile ) {
-		return NULL;
-	}
-	
 	/* read the blend file header */
-	if(gzread(gzfile, buf, 8) != 8)		goto thumb_error;
-	if(strncmp(buf, "BLENDER", 7))		goto thumb_error;
-	
-	if(buf[7]=='-')						pointer_size= 8;
-	else if(buf[7]=='_')				pointer_size= 4;
-	else								goto thumb_error;
-	
+	if(gzread(gzfile, buf, 8) != 8)
+		return NULL;
+	if(strncmp(buf, "BLENDER", 7))
+		return NULL;
+
+	if(buf[7]=='-')
+		pointer_size= 8;
+	else if(buf[7]=='_')
+		pointer_size= 4;
+	else
+		return NULL;
+
 	/* read the next 4 bytes, only need the first char, ignore the version */
 	/* endian and vertsion (ignored) */
-	if(gzread(gzfile, buf, 4) != 4)		goto thumb_error;
-	
-	if(buf[0]=='V')						endian= B_ENDIAN; /* big: PPC */
-	else if(buf[0]=='v')				endian= L_ENDIAN; /* little: x86 */
-	else								goto thumb_error;
+	if(gzread(gzfile, buf, 4) != 4)
+		return NULL;
+
+	if(buf[0]=='V')
+		endian= B_ENDIAN; /* big: PPC */
+	else if(buf[0]=='v')
+		endian= L_ENDIAN; /* little: x86 */
+	else
+		return NULL;
 
 	while(gzread(gzfile, &code, sizeof(int)) == sizeof(int)) {
 		endian_switch = ((ENDIAN_ORDER != endian)) ? 1 : 0;
-		
-		if(gzread(gzfile, buf, sizeof(int)) != sizeof(int))		goto thumb_error;
+
+		if(gzread(gzfile, buf, sizeof(int)) != sizeof(int))
+			return NULL;
+
 		len = *( (int *)((void *)buf) );
-		if(endian_switch) SWITCH_INT(len);
-		
+
+		if(endian_switch)
+			SWITCH_INT(len);
+
 		/* finally read the rest of the bhead struct, pointer and 2 ints */
-		if(gzread(gzfile, buf, pointer_size) != pointer_size)	goto thumb_error;
-		if(gzread(gzfile, buf, sizeof(int) * 2) != sizeof(int) * 2)	goto thumb_error;
+		if(gzread(gzfile, buf, pointer_size) != pointer_size)
+			return NULL;
+		if(gzread(gzfile, buf, sizeof(int) * 2) != sizeof(int) * 2)
+			return NULL;
+
 		/* we dont actually care whats in the bhead */
-		
 		if (code==REND) {
 			gzseek(gzfile, len, SEEK_CUR); /* skip to the next */
 		}
@@ -92,40 +98,57 @@ ImBuf *IMB_loadblend_thumb(const char *path)
 			break;
 		}
 	}
-	
+
 	/* using 'TEST' since new names segfault when loading in old blenders */
-	if(code != TEST)					goto thumb_error;
-	
-	if(gzread(gzfile, &x, sizeof(int)) != sizeof(int))		goto thumb_error;
-	if(gzread(gzfile, &y, sizeof(int)) != sizeof(int))		goto thumb_error;
+	if(code != TEST)
+		return NULL;
+
+	if(gzread(gzfile, &x, sizeof(int)) != sizeof(int))
+		return NULL;
+	if(gzread(gzfile, &y, sizeof(int)) != sizeof(int))
+		return NULL;
+
 	len -= sizeof(int) * 2;
 
-	if(endian_switch) { SWITCH_INT(x); SWITCH_INT(y); }
+	if(endian_switch) {
+		SWITCH_INT(x);
+		SWITCH_INT(y);
+	}
 
 	/* inconsistant image size, quit early */
 	im_len = x * y * sizeof(int);
-	if(im_len != len)					goto thumb_error;
+	if(im_len != len)
+		return NULL;
 
 	/* finally malloc and read the data */
-	rect= MEM_mallocN(len, "imb_loadblend_thumb");
+	img= IMB_allocImBuf(x, y, 32, IB_rect, 0);
+
+	if(gzread(gzfile, img->rect, len) != len) {
+		IMB_freeImBuf(img);
+		img= NULL;
+	}
 
-	if(gzread(gzfile, rect, len) != len) goto thumb_error;
+	return img;
+}
 
-	/* read ok! */
-	gzclose(gzfile);
+ImBuf *IMB_loadblend_thumb(const char *path)
+{
+	gzFile gzfile;
 
-	img = IMB_allocImBuf(x, y, 32, IB_rect | IB_metadata, 0);
+	/* not necessarily a gzip */
+	gzfile = gzopen(path, "rb");
 
-	memcpy(img->rect, rect, im_len);
+	if (NULL == gzfile ) {
+		return NULL;
+	}
+	else {
+		ImBuf *img= loadblend_thumb(gzfile);
 
-	MEM_freeN(rect);
-	
-	return img;	
+		/* read ok! */
+		gzclose(gzfile);
 
-thumb_error:
-	gzclose(gzfile);
-	if(rect) MEM_freeN(rect);
-	return NULL;
+		return img;
+	}
 }
 
 /* add a fake passepartout overlay to a byte buffer, use for blend file thumbnails */
-- 
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