Remove GetAt from string classes

This method duplicates the behaviour of the const [] operator and
doesn't offer any additional safety. Folding them into one
implementation.

SetAt is retained, since implementing the non-const [] operator to
replace SetAt has potential performance concerns. Specifically many
non-obvious cases of reading an element using [] will cause a realloc
& copy.

BUG=pdfium:860

Change-Id: I3ef5e5e5a15376f040256b646eb0d90636e24b67
Reviewed-on: https://pdfium-review.googlesource.com/10870
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

5 files changed, 9 insertions, 9 deletions

diff --git a/fxbarcode/oned/BC_OnedCodaBarWriter.cpp b/fxbarcode/oned/BC_OnedCodaBarWriter.cpp
index 14ffcdfc35..ecaeb8d656 100644
--- a/fxbarcode/oned/BC_OnedCodaBarWriter.cpp
+++ b/fxbarcode/oned/BC_OnedCodaBarWriter.cpp
@@ -106,7 +106,7 @@ CFX_WideString CBC_OnedCodaBarWriter::FilterContents(
   CFX_WideString filtercontents;
   wchar_t ch;
   for (int32_t index = 0; index < contents.GetLength(); index++) {
-    ch = contents.GetAt(index);
+    ch = contents[index];
     if (ch > 175) {
       index++;
       continue;
@@ -137,7 +137,7 @@ uint8_t* CBC_OnedCodaBarWriter::EncodeImpl(const CFX_ByteString& contents,
   char ch;
   int32_t position = 0;
   for (int32_t index = 0; index < data.GetLength(); index++) {
-    ch = data.GetAt(index);
+    ch = data[index];
     if (((ch >= 'a') && (ch <= 'z'))) {
       ch = ch - 32;
     }
diff --git a/fxbarcode/oned/BC_OnedCode39Writer.cpp b/fxbarcode/oned/BC_OnedCode39Writer.cpp
index b9d594a028..cd87231fdf 100644
--- a/fxbarcode/oned/BC_OnedCode39Writer.cpp
+++ b/fxbarcode/oned/BC_OnedCode39Writer.cpp
@@ -50,7 +50,7 @@ CBC_OnedCode39Writer::~CBC_OnedCode39Writer() {}
 bool CBC_OnedCode39Writer::CheckContentValidity(
     const CFX_WideStringC& contents) {
   for (int32_t i = 0; i < contents.GetLength(); i++) {
-    wchar_t ch = contents.GetAt(i);
+    wchar_t ch = contents[i];
     if ((ch >= (wchar_t)'0' && ch <= (wchar_t)'9') ||
         (ch >= (wchar_t)'A' && ch <= (wchar_t)'Z') || ch == (wchar_t)'-' ||
         ch == (wchar_t)'.' || ch == (wchar_t)' ' || ch == (wchar_t)'*' ||
@@ -67,7 +67,7 @@ CFX_WideString CBC_OnedCode39Writer::FilterContents(
     const CFX_WideStringC& contents) {
   CFX_WideString filtercontents;
   for (int32_t i = 0; i < contents.GetLength(); i++) {
-    wchar_t ch = contents.GetAt(i);
+    wchar_t ch = contents[i];
     if (ch == (wchar_t)'*' && (i == 0 || i == contents.GetLength() - 1)) {
       continue;
     }
@@ -92,7 +92,7 @@ CFX_WideString CBC_OnedCode39Writer::RenderTextContents(
     const CFX_WideStringC& contents) {
   CFX_WideString renderContents;
   for (int32_t i = 0; i < contents.GetLength(); i++) {
-    wchar_t ch = contents.GetAt(i);
+    wchar_t ch = contents[i];
     if (ch == (wchar_t)'*' && (i == 0 || i == contents.GetLength() - 1)) {
       continue;
     }
diff --git a/fxbarcode/oned/BC_OnedEAN13Writer.cpp b/fxbarcode/oned/BC_OnedEAN13Writer.cpp
index 6f1d957a01..85f545c602 100644
--- a/fxbarcode/oned/BC_OnedEAN13Writer.cpp
+++ b/fxbarcode/oned/BC_OnedEAN13Writer.cpp
@@ -64,7 +64,7 @@ CFX_WideString CBC_OnedEAN13Writer::FilterContents(
   CFX_WideString filtercontents;
   wchar_t ch;
   for (int32_t i = 0; i < contents.GetLength(); i++) {
-    ch = contents.GetAt(i);
+    ch = contents[i];
     if (ch > 175) {
       i++;
       continue;
diff --git a/fxbarcode/oned/BC_OnedEAN8Writer.cpp b/fxbarcode/oned/BC_OnedEAN8Writer.cpp
index 9a85f814a7..ae10fe52ef 100644
--- a/fxbarcode/oned/BC_OnedEAN8Writer.cpp
+++ b/fxbarcode/oned/BC_OnedEAN8Writer.cpp
@@ -70,7 +70,7 @@ CFX_WideString CBC_OnedEAN8Writer::FilterContents(
   CFX_WideString filtercontents;
   wchar_t ch;
   for (int32_t i = 0; i < contents.GetLength(); i++) {
-    ch = contents.GetAt(i);
+    ch = contents[i];
     if (ch > 175) {
       i++;
       continue;
diff --git a/fxbarcode/oned/BC_OnedUPCAWriter.cpp b/fxbarcode/oned/BC_OnedUPCAWriter.cpp
index 13514eb53f..fff4184221 100644
--- a/fxbarcode/oned/BC_OnedUPCAWriter.cpp
+++ b/fxbarcode/oned/BC_OnedUPCAWriter.cpp
@@ -43,7 +43,7 @@ CBC_OnedUPCAWriter::~CBC_OnedUPCAWriter() {}
 
 bool CBC_OnedUPCAWriter::CheckContentValidity(const CFX_WideStringC& contents) {
   for (FX_STRSIZE i = 0; i < contents.GetLength(); ++i) {
-    if (contents.GetAt(i) < '0' || contents.GetAt(i) > '9')
+    if (contents[i] < '0' || contents[i] > '9')
       return false;
   }
   return true;
@@ -54,7 +54,7 @@ CFX_WideString CBC_OnedUPCAWriter::FilterContents(
   CFX_WideString filtercontents;
   wchar_t ch;
   for (int32_t i = 0; i < contents.GetLength(); i++) {
-    ch = contents.GetAt(i);
+    ch = contents[i];
     if (ch > 175) {
       i++;
       continue;