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// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include <algorithm>
#include <limits>
#include <memory>
#include <utility>
#include "core/fxcrt/fx_basic.h"
#include "core/fxcrt/fx_safe_types.h"
#include "third_party/base/numerics/safe_conversions.h"
CFX_BinaryBuf::CFX_BinaryBuf()
: m_AllocStep(0), m_AllocSize(0), m_DataSize(0) {}
CFX_BinaryBuf::CFX_BinaryBuf(FX_STRSIZE size)
: m_AllocStep(0), m_AllocSize(size), m_DataSize(size) {
m_pBuffer.reset(FX_Alloc(uint8_t, size));
}
CFX_BinaryBuf::~CFX_BinaryBuf() {}
void CFX_BinaryBuf::Delete(int start_index, int count) {
if (!m_pBuffer || start_index < 0 || count < 0 || count > m_DataSize ||
start_index > m_DataSize - count) {
return;
}
memmove(m_pBuffer.get() + start_index, m_pBuffer.get() + start_index + count,
m_DataSize - start_index - count);
m_DataSize -= count;
}
void CFX_BinaryBuf::Clear() {
m_DataSize = 0;
}
std::unique_ptr<uint8_t, FxFreeDeleter> CFX_BinaryBuf::DetachBuffer() {
m_DataSize = 0;
m_AllocSize = 0;
return std::move(m_pBuffer);
}
void CFX_BinaryBuf::EstimateSize(FX_STRSIZE size, FX_STRSIZE step) {
m_AllocStep = step;
if (m_AllocSize < size)
ExpandBuf(size - m_DataSize);
}
void CFX_BinaryBuf::ExpandBuf(FX_STRSIZE add_size) {
FX_SAFE_STRSIZE new_size = m_DataSize;
new_size += add_size;
if (m_AllocSize >= new_size.ValueOrDie())
return;
int alloc_step = std::max(128, m_AllocStep ? m_AllocStep : m_AllocSize / 4);
new_size += alloc_step - 1; // Quantize, don't combine these lines.
new_size /= alloc_step;
new_size *= alloc_step;
m_AllocSize = new_size.ValueOrDie();
m_pBuffer.reset(m_pBuffer
? FX_Realloc(uint8_t, m_pBuffer.release(), m_AllocSize)
: FX_Alloc(uint8_t, m_AllocSize));
}
void CFX_BinaryBuf::AppendBlock(const void* pBuf, FX_STRSIZE size) {
if (size <= 0)
return;
ExpandBuf(size);
if (pBuf) {
memcpy(m_pBuffer.get() + m_DataSize, pBuf, size);
} else {
memset(m_pBuffer.get() + m_DataSize, 0, size);
}
m_DataSize += size;
}
void CFX_BinaryBuf::InsertBlock(FX_STRSIZE pos,
const void* pBuf,
FX_STRSIZE size) {
if (size <= 0)
return;
ExpandBuf(size);
memmove(m_pBuffer.get() + pos + size, m_pBuffer.get() + pos,
m_DataSize - pos);
if (pBuf) {
memcpy(m_pBuffer.get() + pos, pBuf, size);
} else {
memset(m_pBuffer.get() + pos, 0, size);
}
m_DataSize += size;
}
void CFX_WideTextBuf::AppendChar(wchar_t ch) {
ExpandBuf(sizeof(wchar_t));
*(wchar_t*)(m_pBuffer.get() + m_DataSize) = ch;
m_DataSize += sizeof(wchar_t);
}
CFX_WideTextBuf& CFX_WideTextBuf::operator<<(const CFX_WideStringC& str) {
AppendBlock(str.unterminated_c_str(), str.GetLength() * sizeof(wchar_t));
return *this;
}
CFX_WideTextBuf& CFX_WideTextBuf::operator<<(const CFX_WideString& str) {
AppendBlock(str.c_str(), str.GetLength() * sizeof(wchar_t));
return *this;
}
CFX_WideTextBuf& CFX_WideTextBuf::operator<<(int i) {
char buf[32];
FXSYS_itoa(i, buf, 10);
FX_STRSIZE len = FXSYS_strlen(buf);
ExpandBuf(len * sizeof(wchar_t));
wchar_t* str = (wchar_t*)(m_pBuffer.get() + m_DataSize);
for (FX_STRSIZE j = 0; j < len; j++) {
*str++ = buf[j];
}
m_DataSize += len * sizeof(wchar_t);
return *this;
}
CFX_WideTextBuf& CFX_WideTextBuf::operator<<(double f) {
char buf[32];
FX_STRSIZE len = FX_ftoa((float)f, buf);
ExpandBuf(len * sizeof(wchar_t));
wchar_t* str = (wchar_t*)(m_pBuffer.get() + m_DataSize);
for (FX_STRSIZE i = 0; i < len; i++) {
*str++ = buf[i];
}
m_DataSize += len * sizeof(wchar_t);
return *this;
}
CFX_WideTextBuf& CFX_WideTextBuf::operator<<(const wchar_t* lpsz) {
AppendBlock(lpsz, FXSYS_wcslen(lpsz) * sizeof(wchar_t));
return *this;
}
CFX_WideTextBuf& CFX_WideTextBuf::operator<<(const CFX_WideTextBuf& buf) {
AppendBlock(buf.m_pBuffer.get(), buf.m_DataSize);
return *this;
}
void CFX_BitStream::Init(const uint8_t* pData, uint32_t dwSize) {
m_pData = pData;
m_BitSize = dwSize * 8;
m_BitPos = 0;
}
void CFX_BitStream::ByteAlign() {
m_BitPos = (m_BitPos + 7) & ~7;
}
uint32_t CFX_BitStream::GetBits(uint32_t nBits) {
if (nBits > m_BitSize || m_BitPos + nBits > m_BitSize)
return 0;
if (nBits == 1) {
int bit = (m_pData[m_BitPos / 8] & (1 << (7 - m_BitPos % 8))) ? 1 : 0;
m_BitPos++;
return bit;
}
uint32_t byte_pos = m_BitPos / 8;
uint32_t bit_pos = m_BitPos % 8;
uint32_t bit_left = nBits;
uint32_t result = 0;
if (bit_pos) {
if (8 - bit_pos >= bit_left) {
result =
(m_pData[byte_pos] & (0xff >> bit_pos)) >> (8 - bit_pos - bit_left);
m_BitPos += bit_left;
return result;
}
bit_left -= 8 - bit_pos;
result = (m_pData[byte_pos++] & ((1 << (8 - bit_pos)) - 1)) << bit_left;
}
while (bit_left >= 8) {
bit_left -= 8;
result |= m_pData[byte_pos++] << bit_left;
}
if (bit_left)
result |= m_pData[byte_pos] >> (8 - bit_left);
m_BitPos += nBits;
return result;
}
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