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-rw-r--r--core/fpdfapi/font/cpdf_cmapparser.cpp4
1 files changed, 3 insertions, 1 deletions
diff --git a/core/fpdfapi/font/cpdf_cmapparser.cpp b/core/fpdfapi/font/cpdf_cmapparser.cpp
index 0f9bca6018..cbf693966e 100644
--- a/core/fpdfapi/font/cpdf_cmapparser.cpp
+++ b/core/fpdfapi/font/cpdf_cmapparser.cpp
@@ -35,7 +35,7 @@ CIDSet CIDSetFromSizeT(size_t index) {
CFX_ByteStringC CMap_GetString(const CFX_ByteStringC& word) {
if (word.GetLength() <= 2)
return CFX_ByteStringC();
- return CFX_ByteStringC(&word[1], word.GetLength() - 2);
+ return word.Right(word.GetLength() - 2);
}
} // namespace
@@ -137,6 +137,8 @@ void CPDF_CMapParser::ParseWord(const CFX_ByteStringC& word) {
// Static.
uint32_t CPDF_CMapParser::CMap_GetCode(const CFX_ByteStringC& word) {
+ if (word.IsEmpty())
+ return 0;
pdfium::base::CheckedNumeric<uint32_t> num = 0;
if (word.GetAt(0) == '<') {
for (int i = 1; i < word.GetLength() && std::isxdigit(word.GetAt(i)); ++i) {