// Copyright 2016 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#include "core/fpdfapi/fpdf_parser/include/cpdf_simple_parser.h"
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#include "core/fpdfapi/fpdf_parser/fpdf_parser_utility.h"
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CPDF_SimpleParser::CPDF_SimpleParser(const uint8_t* pData, uint32_t dwSize)
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: m_pData(pData), m_dwSize(dwSize), m_dwCurPos(0) {}
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CPDF_SimpleParser::CPDF_SimpleParser(const CFX_ByteStringC& str)
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: m_pData(str.raw_str()), m_dwSize(str.GetLength()), m_dwCurPos(0) {}
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void CPDF_SimpleParser::ParseWord(const uint8_t*& pStart, uint32_t& dwSize) {
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pStart = nullptr;
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dwSize = 0;
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uint8_t ch;
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while (1) {
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if (m_dwSize <= m_dwCurPos)
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return;
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ch = m_pData[m_dwCurPos++];
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while (PDFCharIsWhitespace(ch)) {
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if (m_dwSize <= m_dwCurPos)
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return;
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ch = m_pData[m_dwCurPos++];
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}
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if (ch != '%')
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break;
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while (1) {
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if (m_dwSize <= m_dwCurPos)
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return;
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ch = m_pData[m_dwCurPos++];
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if (PDFCharIsLineEnding(ch))
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break;
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}
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}
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uint32_t start_pos = m_dwCurPos - 1;
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pStart = m_pData + start_pos;
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if (PDFCharIsDelimiter(ch)) {
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if (ch == '/') {
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while (1) {
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if (m_dwSize <= m_dwCurPos)
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return;
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ch = m_pData[m_dwCurPos++];
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if (!PDFCharIsOther(ch) && !PDFCharIsNumeric(ch)) {
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m_dwCurPos--;
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dwSize = m_dwCurPos - start_pos;
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return;
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}
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}
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} else {
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dwSize = 1;
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if (ch == '<') {
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if (m_dwSize <= m_dwCurPos)
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return;
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ch = m_pData[m_dwCurPos++];
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if (ch == '<')
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dwSize = 2;
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else
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m_dwCurPos--;
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} else if (ch == '>') {
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if (m_dwSize <= m_dwCurPos)
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return;
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ch = m_pData[m_dwCurPos++];
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if (ch == '>')
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dwSize = 2;
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else
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m_dwCurPos--;
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}
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}
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return;
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}
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dwSize = 1;
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while (1) {
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if (m_dwSize <= m_dwCurPos)
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return;
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ch = m_pData[m_dwCurPos++];
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if (PDFCharIsDelimiter(ch) || PDFCharIsWhitespace(ch)) {
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m_dwCurPos--;
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break;
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}
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dwSize++;
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}
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}
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CFX_ByteStringC CPDF_SimpleParser::GetWord() {
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const uint8_t* pStart;
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uint32_t dwSize;
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ParseWord(pStart, dwSize);
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if (dwSize == 1 && pStart[0] == '<') {
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while (m_dwCurPos < m_dwSize && m_pData[m_dwCurPos] != '>') {
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m_dwCurPos++;
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}
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if (m_dwCurPos < m_dwSize) {
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m_dwCurPos++;
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}
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return CFX_ByteStringC(pStart,
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(FX_STRSIZE)(m_dwCurPos - (pStart - m_pData)));
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}
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if (dwSize == 1 && pStart[0] == '(') {
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int level = 1;
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while (m_dwCurPos < m_dwSize) {
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if (m_pData[m_dwCurPos] == ')') {
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level--;
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if (level == 0) {
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break;
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}
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}
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if (m_pData[m_dwCurPos] == '\\') {
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if (m_dwSize <= m_dwCurPos) {
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break;
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}
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m_dwCurPos++;
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} else if (m_pData[m_dwCurPos] == '(') {
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level++;
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}
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if (m_dwSize <= m_dwCurPos) {
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break;
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}
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m_dwCurPos++;
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}
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if (m_dwCurPos < m_dwSize) {
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m_dwCurPos++;
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}
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return CFX_ByteStringC(pStart,
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(FX_STRSIZE)(m_dwCurPos - (pStart - m_pData)));
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}
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return CFX_ByteStringC(pStart, dwSize);
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}
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bool CPDF_SimpleParser::FindTagParamFromStart(const CFX_ByteStringC& token,
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int nParams) {
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nParams++;
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uint32_t* pBuf = FX_Alloc(uint32_t, nParams);
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int buf_index = 0;
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int buf_count = 0;
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m_dwCurPos = 0;
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while (1) {
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pBuf[buf_index++] = m_dwCurPos;
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if (buf_index == nParams) {
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buf_index = 0;
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}
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buf_count++;
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if (buf_count > nParams) {
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buf_count = nParams;
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}
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CFX_ByteStringC word = GetWord();
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if (word.IsEmpty()) {
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FX_Free(pBuf);
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return false;
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}
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if (word == token) {
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if (buf_count < nParams) {
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continue;
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}
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m_dwCurPos = pBuf[buf_index];
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FX_Free(pBuf);
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return true;
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}
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}
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return false;
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}
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