update

tests/pre15/fixtures/B27-compact-finalization.c

@@ -0,0 +1,50 @@
+#include <stdint.h>
+#include <stdio.h>
+
+#define Z_EROFS_LI_D0_CBLKCNT 0x800U
+#define Z_EROFS_LCLUSTER_TYPE_NONHEAD 2U
+
+static unsigned int
+compact_head_nblocks(const uint16_t *values, const uint8_t *types, int index)
+{
+	unsigned int blocks, value;
+
+	blocks = 0;
+	while (index > 0) {
+		--index;
+		value = values[index];
+		if (types[index] == Z_EROFS_LCLUSTER_TYPE_NONHEAD) {
+			if ((value & Z_EROFS_LI_D0_CBLKCNT) != 0) {
+				--index;
+				blocks += value & ~Z_EROFS_LI_D0_CBLKCNT;
+				continue;
+			}
+			if (value <= 1)
+				return (UINT32_MAX);
+			index -= value - 2;
+			continue;
+		}
+		++blocks;
+	}
+	return (blocks);
+}
+
+int
+main(void)
+{
+	uint16_t values[16] = { 0 };
+	uint8_t types[16] = { 0 };
+	unsigned int blocks;
+
+	values[0] = Z_EROFS_LI_D0_CBLKCNT | 1U;
+	types[0] = Z_EROFS_LCLUSTER_TYPE_NONHEAD;
+	values[4] = 5U;
+	types[4] = Z_EROFS_LCLUSTER_TYPE_NONHEAD;
+	blocks = compact_head_nblocks(values, types, 5);
+	if (blocks != 1U) {
+		fprintf(stderr, "compact HEAD finalization blocks=%u expected=1\n",
+		    blocks);
+		return (1);
+	}
+	return (0);
+}