Merge cherrypicks of [2938191, 2937681, 2937682, 2938081, 2938082, 2938083,...

Merge cherrypicks of [2938191, 2937681, 2937682, 2938081, 2938082, 2938083, 2938084, 2936625, 2936626, 2937945, 2937946, 2937947, 2937948, 2938729, 2938192, 2938193, 2938194, 2938195, 2938196, 2937683, 2937684, 2937685, 2938085, 2937965, 2938197, 2938388] into oc-r4-release

Change-Id: Ib6ae1240a59955e1b8d50315e880dcd7f8c53622

libutils/Unicode.cpp

@@ -180,7 +180,15 @@ ssize_t utf32_to_utf8_length(const char32_t *src, size_t src_len)
     size_t ret = 0;
     const char32_t *end = src + src_len;
     while (src < end) {
-        ret += utf32_codepoint_utf8_length(*src++);
+        size_t char_len = utf32_codepoint_utf8_length(*src++);
+        if (SSIZE_MAX - char_len < ret) {
+            // If this happens, we would overflow the ssize_t type when
+            // returning from this function, so we cannot express how
+            // long this string is in an ssize_t.
+            android_errorWriteLog(0x534e4554, "37723026");
+            return -1;
+        }
+        ret += char_len;
     }
     return ret;
 }
@@ -440,14 +448,23 @@ ssize_t utf16_to_utf8_length(const char16_t *src, size_t src_len)
     size_t ret = 0;
     const char16_t* const end = src + src_len;
     while (src < end) {
+        size_t char_len;
         if ((*src & 0xFC00) == 0xD800 && (src + 1) < end
                 && (*(src + 1) & 0xFC00) == 0xDC00) {
             // surrogate pairs are always 4 bytes.
-            ret += 4;
+            char_len = 4;
             src += 2;
         } else {
-            ret += utf32_codepoint_utf8_length((char32_t) *src++);
+            char_len = utf32_codepoint_utf8_length((char32_t)*src++);
+        }
+        if (SSIZE_MAX - char_len < ret) {
+            // If this happens, we would overflow the ssize_t type when
+            // returning from this function, so we cannot express how
+            // long this string is in an ssize_t.
+            android_errorWriteLog(0x534e4554, "37723026");
+            return -1;
         }
+        ret += char_len;
     }
     return ret;
 }