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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 "core/fpdfapi/parser/fpdf_parser_utility.h"
#include "core/fpdfapi/parser/cpdf_array.h"
#include "core/fpdfapi/parser/cpdf_boolean.h"
#include "core/fpdfapi/parser/cpdf_dictionary.h"
#include "core/fpdfapi/parser/cpdf_number.h"
#include "core/fpdfapi/parser/cpdf_reference.h"
#include "core/fpdfapi/parser/cpdf_stream.h"
#include "core/fpdfapi/parser/cpdf_stream_acc.h"
#include "core/fpdfapi/parser/cpdf_string.h"
#include "core/fpdfapi/parser/fpdf_parser_decode.h"
#include "core/fxcrt/fx_extension.h"
#include "core/fxcrt/fx_stream.h"
#include "third_party/base/logging.h"
// Indexed by 8-bit character code, contains either:
// 'W' - for whitespace: NUL, TAB, CR, LF, FF, SPACE, 0x80, 0xff
// 'N' - for numeric: 0123456789+-.
// 'D' - for delimiter: %()/<>[]{}
// 'R' - otherwise.
const char PDF_CharType[256] = {
// NUL SOH STX ETX EOT ENQ ACK BEL BS HT LF VT FF CR SO
// SI
'W', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'W', 'W', 'R', 'W', 'W', 'R',
'R',
// DLE DC1 DC2 DC3 DC4 NAK SYN ETB CAN EM SUB ESC FS GS RS
// US
'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R',
'R',
// SP ! " # $ % & ´ ( ) * + , - .
// /
'W', 'R', 'R', 'R', 'R', 'D', 'R', 'R', 'D', 'D', 'R', 'N', 'R', 'N', 'N',
'D',
// 0 1 2 3 4 5 6 7 8 9 : ; < = > ?
'N', 'N', 'N', 'N', 'N', 'N', 'N', 'N', 'N', 'N', 'R', 'R', 'D', 'R', 'D',
'R',
// @ A B C D E F G H I J K L M N O
'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R',
'R',
// P Q R S T U V W X Y Z [ \ ] ^ _
'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'D', 'R', 'D', 'R',
'R',
// ` a b c d e f g h i j k l m n o
'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R',
'R',
// p q r s t u v w x y z { | } ~
// DEL
'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'D', 'R', 'D', 'R',
'R',
'W', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R',
'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R',
'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R',
'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R',
'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R',
'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R',
'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R',
'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R', 'R',
'R', 'R', 'R', 'R', 'R', 'R', 'R', 'W'};
Optional<FX_FILESIZE> GetHeaderOffset(
const RetainPtr<IFX_SeekableReadStream>& pFile) {
static constexpr size_t kBufSize = 4;
uint8_t buf[kBufSize];
for (FX_FILESIZE offset = 0; offset <= 1024; ++offset) {
if (!pFile->ReadBlock(buf, offset, kBufSize))
return {};
if (memcmp(buf, "%PDF", 4) == 0)
return offset;
}
return {};
}
int32_t GetDirectInteger(const CPDF_Dictionary* pDict, const ByteString& key) {
const CPDF_Number* pObj = ToNumber(pDict->GetObjectFor(key));
return pObj ? pObj->GetInteger() : 0;
}
ByteString PDF_NameDecode(const ByteStringView& bstr) {
if (!bstr.Contains('#'))
return ByteString(bstr);
size_t src_size = bstr.GetLength();
size_t out_index = 0;
ByteString result;
{
// Span's lifetime must end before ReleaseBuffer() below.
pdfium::span<char> pDest = result.GetBuffer(src_size);
for (size_t i = 0; i < src_size; i++) {
if (bstr[i] == '#' && i + 2 < src_size) {
pDest[out_index++] = FXSYS_HexCharToInt(bstr[i + 1]) * 16 +
FXSYS_HexCharToInt(bstr[i + 2]);
i += 2;
} else {
pDest[out_index++] = bstr[i];
}
}
}
result.ReleaseBuffer(out_index);
return result;
}
ByteString PDF_NameEncode(const ByteString& orig) {
const uint8_t* src_buf = reinterpret_cast<const uint8_t*>(orig.c_str());
int src_len = orig.GetLength();
int dest_len = 0;
int i;
for (i = 0; i < src_len; i++) {
uint8_t ch = src_buf[i];
if (ch >= 0x80 || PDFCharIsWhitespace(ch) || ch == '#' ||
PDFCharIsDelimiter(ch)) {
dest_len += 3;
} else {
dest_len++;
}
}
if (dest_len == src_len)
return orig;
ByteString res;
{
// Span's lifetime must end before ReleaseBuffer() below.
pdfium::span<char> dest_buf = res.GetBuffer(dest_len);
dest_len = 0;
for (i = 0; i < src_len; i++) {
uint8_t ch = src_buf[i];
if (ch >= 0x80 || PDFCharIsWhitespace(ch) || ch == '#' ||
PDFCharIsDelimiter(ch)) {
dest_buf[dest_len++] = '#';
FXSYS_IntToTwoHexChars(ch, &dest_buf[dest_len]);
dest_len += 2;
continue;
}
dest_buf[dest_len++] = ch;
}
}
res.ReleaseBuffer(dest_len);
return res;
}
std::ostream& operator<<(std::ostream& buf, const CPDF_Object* pObj) {
if (!pObj) {
buf << " null";
return buf;
}
switch (pObj->GetType()) {
case CPDF_Object::NULLOBJ:
buf << " null";
break;
case CPDF_Object::BOOLEAN:
case CPDF_Object::NUMBER:
buf << " " << pObj->GetString();
break;
case CPDF_Object::STRING:
buf << PDF_EncodeString(pObj->GetString(), pObj->AsString()->IsHex());
break;
case CPDF_Object::NAME: {
ByteString str = pObj->GetString();
buf << "/" << PDF_NameEncode(str);
break;
}
case CPDF_Object::REFERENCE: {
buf << " " << pObj->AsReference()->GetRefObjNum() << " 0 R ";
break;
}
case CPDF_Object::ARRAY: {
const CPDF_Array* p = pObj->AsArray();
buf << "[";
for (size_t i = 0; i < p->GetCount(); i++) {
const CPDF_Object* pElement = p->GetObjectAt(i);
if (pElement && !pElement->IsInline()) {
buf << " " << pElement->GetObjNum() << " 0 R";
} else {
buf << pElement;
}
}
buf << "]";
break;
}
case CPDF_Object::DICTIONARY: {
const CPDF_Dictionary* p = pObj->AsDictionary();
buf << "<<";
for (const auto& it : *p) {
const ByteString& key = it.first;
CPDF_Object* pValue = it.second.get();
buf << "/" << PDF_NameEncode(key);
if (pValue && !pValue->IsInline()) {
buf << " " << pValue->GetObjNum() << " 0 R ";
} else {
buf << pValue;
}
}
buf << ">>";
break;
}
case CPDF_Object::STREAM: {
const CPDF_Stream* p = pObj->AsStream();
buf << p->GetDict() << "stream\r\n";
auto pAcc = pdfium::MakeRetain<CPDF_StreamAcc>(p);
pAcc->LoadAllDataRaw();
buf.write(reinterpret_cast<const char*>(pAcc->GetData()),
pAcc->GetSize());
buf << "\r\nendstream";
break;
}
default:
NOTREACHED();
break;
}
return buf;
}
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