From b2a40475ade2fe34a406472e53787bdac5a6950a Mon Sep 17 00:00:00 2001
From: Lei Zhang <thestig@chromium.org>
Date: Tue, 4 Apr 2017 16:15:13 -0700
Subject: Clean up QRCoderBitVector.

Use std::vector and return booleans results when possible.

Change-Id: If3ce4559f137fb449fd1ab818750558a1b5f8df0
Reviewed-on: https://pdfium-review.googlesource.com/3561
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
---
 fxbarcode/qrcode/BC_QRCoderBitVector.cpp | 110 +++++++++++++------------------
 1 file changed, 44 insertions(+), 66 deletions(-)

(limited to 'fxbarcode/qrcode/BC_QRCoderBitVector.cpp')

diff --git a/fxbarcode/qrcode/BC_QRCoderBitVector.cpp b/fxbarcode/qrcode/BC_QRCoderBitVector.cpp
index 2e3c341792..7a41ad0910 100644
--- a/fxbarcode/qrcode/BC_QRCoderBitVector.cpp
+++ b/fxbarcode/qrcode/BC_QRCoderBitVector.cpp
@@ -20,45 +20,34 @@
  * limitations under the License.
  */
 
-#include "core/fxcrt/fx_memory.h"
 #include "fxbarcode/qrcode/BC_QRCoderBitVector.h"
+
+#include "core/fxcrt/fx_memory.h"
 #include "fxbarcode/utils.h"
 
-CBC_QRCoderBitVector::CBC_QRCoderBitVector() {
-  m_sizeInBits = 0;
-  m_size = 32;
-}
-void CBC_QRCoderBitVector::Init() {
-  m_array = FX_Alloc(uint8_t, m_size);
-}
-CBC_QRCoderBitVector::~CBC_QRCoderBitVector() {
-  FX_Free(m_array);
-}
-void CBC_QRCoderBitVector::Clear() {
-  FX_Free(m_array);
-  m_sizeInBits = 0;
-  m_size = 32;
-  m_array = FX_Alloc(uint8_t, m_size);
-}
-int32_t CBC_QRCoderBitVector::At(int32_t index, int32_t& e) {
-  if (index < 0 || index >= m_sizeInBits) {
+CBC_QRCoderBitVector::CBC_QRCoderBitVector() {}
+
+CBC_QRCoderBitVector::~CBC_QRCoderBitVector() {}
+
+int32_t CBC_QRCoderBitVector::At(size_t index, int32_t& e) const {
+  if (index >= m_sizeInBits) {
     e = BCExceptionBadIndexException;
     return 0;
   }
   int32_t value = m_array[index >> 3] & 0xff;
   return (value >> (7 - (index & 0x7))) & 1;
 }
-int32_t CBC_QRCoderBitVector::sizeInBytes() {
+
+size_t CBC_QRCoderBitVector::sizeInBytes() const {
   return (m_sizeInBits + 7) >> 3;
 }
-int32_t CBC_QRCoderBitVector::Size() {
+
+size_t CBC_QRCoderBitVector::Size() const {
   return m_sizeInBits;
 }
-void CBC_QRCoderBitVector::AppendBit(int32_t bit, int32_t& e) {
-  if (!(bit == 0 || bit == 1)) {
-    e = BCExceptionBadValueException;
-    return;
-  }
+
+void CBC_QRCoderBitVector::AppendBit(int32_t bit) {
+  ASSERT(bit == 0 || bit == 1);
   int32_t numBitsInLastByte = m_sizeInBits & 0x7;
   if (numBitsInLastByte == 0) {
     AppendByte(0);
@@ -67,61 +56,50 @@ void CBC_QRCoderBitVector::AppendBit(int32_t bit, int32_t& e) {
   m_array[m_sizeInBits >> 3] |= (bit << (7 - numBitsInLastByte));
   ++m_sizeInBits;
 }
-void CBC_QRCoderBitVector::AppendBits(int32_t value,
-                                      int32_t numBits,
-                                      int32_t& e) {
-  if (numBits < 0 || numBits > 32) {
-    e = BCExceptionBadNumBitsException;
-    return;
-  }
+
+void CBC_QRCoderBitVector::AppendBits(int32_t value, int32_t numBits) {
+  ASSERT(numBits > 0);
+  ASSERT(numBits <= 32);
+
   int32_t numBitsLeft = numBits;
   while (numBitsLeft > 0) {
     if ((m_sizeInBits & 0x7) == 0 && numBitsLeft >= 8) {
-      int32_t newByte = (value >> (numBitsLeft - 8)) & 0xff;
-      AppendByte(newByte);
+      AppendByte(static_cast<int8_t>((value >> (numBitsLeft - 8)) & 0xff));
       numBitsLeft -= 8;
     } else {
-      int32_t bit = (value >> (numBitsLeft - 1)) & 1;
-      AppendBit(bit, e);
-      if (e != BCExceptionNO)
-        return;
+      AppendBit((value >> (numBitsLeft - 1)) & 1);
       --numBitsLeft;
     }
   }
 }
-void CBC_QRCoderBitVector::AppendBitVector(CBC_QRCoderBitVector* bits,
-                                           int32_t& e) {
+
+void CBC_QRCoderBitVector::AppendBitVector(CBC_QRCoderBitVector* bits) {
   int32_t size = bits->Size();
   for (int32_t i = 0; i < size; i++) {
+    int e = BCExceptionNO;
     int32_t num = bits->At(i, e);
-    if (e != BCExceptionNO)
-      return;
-    AppendBit(num, e);
-    if (e != BCExceptionNO)
-      return;
+    ASSERT(e == BCExceptionNO);
+    AppendBit(num);
   }
 }
-void CBC_QRCoderBitVector::XOR(CBC_QRCoderBitVector* other, int32_t& e) {
-  if (m_sizeInBits != other->Size()) {
-    e = BCExceptioncanNotOperatexorOperator;
-    return;
-  }
-  int32_t sizeInBytes = (m_sizeInBits + 7) >> 3;
-  for (int32_t i = 0; i < sizeInBytes; ++i) {
-    m_array[i] ^= (other->GetArray())[i];
-  }
+
+bool CBC_QRCoderBitVector::XOR(const CBC_QRCoderBitVector* other) {
+  if (m_sizeInBits != other->Size())
+    return false;
+
+  const auto* pOther = other->GetArray();
+  for (size_t i = 0; i < sizeInBytes(); ++i)
+    m_array[i] ^= pOther[i];
+  return true;
 }
-uint8_t* CBC_QRCoderBitVector::GetArray() {
-  return m_array;
+
+const uint8_t* CBC_QRCoderBitVector::GetArray() const {
+  return m_array.data();
 }
-void CBC_QRCoderBitVector::AppendByte(int32_t value) {
-  if ((m_sizeInBits >> 3) == m_size) {
-    uint8_t* newArray = FX_Alloc(uint8_t, m_size << 1);
-    memcpy(newArray, m_array, m_size);
-    FX_Free(m_array);
-    m_array = newArray;
-    m_size = m_size << 1;
-  }
-  m_array[m_sizeInBits >> 3] = (uint8_t)value;
+
+void CBC_QRCoderBitVector::AppendByte(int8_t value) {
+  if ((m_sizeInBits >> 3) == m_array.size())
+    m_array.push_back(0);
+  m_array[m_sizeInBits >> 3] = value;
   m_sizeInBits += 8;
 }
-- 
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