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// Copyright 2016 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 "core/fpdfapi/parser/cpdf_simple_parser.h"
#include <vector>
#include "core/fpdfapi/parser/fpdf_parser_utility.h"
CPDF_SimpleParser::CPDF_SimpleParser(const ByteStringView& str) : data_(str) {}
CPDF_SimpleParser::~CPDF_SimpleParser() = default;
ByteStringView CPDF_SimpleParser::GetWord() {
uint8_t ch;
// Skip whitespace and comment lines.
while (1) {
if (data_.GetLength() <= cur_pos_)
return ByteStringView();
ch = data_[cur_pos_++];
while (PDFCharIsWhitespace(ch)) {
if (data_.GetLength() <= cur_pos_)
return ByteStringView();
ch = data_[cur_pos_++];
}
if (ch != '%')
break;
while (1) {
if (data_.GetLength() <= cur_pos_)
return ByteStringView();
ch = data_[cur_pos_++];
if (PDFCharIsLineEnding(ch))
break;
}
}
uint8_t dwSize = 0;
uint32_t start_pos = cur_pos_ - 1;
if (PDFCharIsDelimiter(ch)) {
// Find names
if (ch == '/') {
while (1) {
if (data_.GetLength() <= cur_pos_)
break;
ch = data_[cur_pos_++];
if (!PDFCharIsOther(ch) && !PDFCharIsNumeric(ch)) {
cur_pos_--;
dwSize = cur_pos_ - start_pos;
break;
}
}
return data_.Mid(start_pos, dwSize);
}
dwSize = 1;
if (ch == '<') {
if (data_.GetLength() <= cur_pos_)
return data_.Mid(start_pos, dwSize);
ch = data_[cur_pos_++];
if (ch == '<') {
dwSize = 2;
} else {
while (cur_pos_ < data_.GetLength() && data_[cur_pos_] != '>')
cur_pos_++;
if (cur_pos_ < data_.GetLength())
cur_pos_++;
dwSize = cur_pos_ - start_pos;
}
} else if (ch == '>') {
if (data_.GetLength() <= cur_pos_)
return data_.Mid(start_pos, dwSize);
ch = data_[cur_pos_++];
if (ch == '>')
dwSize = 2;
else
cur_pos_--;
} else if (ch == '(') {
int level = 1;
while (cur_pos_ < data_.GetLength()) {
if (data_[cur_pos_] == ')') {
level--;
if (level == 0)
break;
}
if (data_[cur_pos_] == '\\') {
if (data_.GetLength() <= cur_pos_)
break;
cur_pos_++;
} else if (data_[cur_pos_] == '(') {
level++;
}
if (data_.GetLength() <= cur_pos_)
break;
cur_pos_++;
}
if (cur_pos_ < data_.GetLength())
cur_pos_++;
dwSize = cur_pos_ - start_pos;
}
return data_.Mid(start_pos, dwSize);
}
dwSize = 1;
while (cur_pos_ < data_.GetLength()) {
ch = data_[cur_pos_++];
if (PDFCharIsDelimiter(ch) || PDFCharIsWhitespace(ch)) {
cur_pos_--;
break;
}
dwSize++;
}
return data_.Mid(start_pos, dwSize);
}
bool CPDF_SimpleParser::FindTagParamFromStart(const ByteStringView& token,
int nParams) {
nParams++;
std::vector<uint32_t> pBuf(nParams);
int buf_index = 0;
int buf_count = 0;
cur_pos_ = 0;
while (1) {
pBuf[buf_index++] = cur_pos_;
if (buf_index == nParams)
buf_index = 0;
buf_count++;
if (buf_count > nParams)
buf_count = nParams;
ByteStringView word = GetWord();
if (word.IsEmpty())
return false;
if (word == token) {
if (buf_count < nParams)
continue;
cur_pos_ = pBuf[buf_index];
return true;
}
}
return false;
}
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