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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
#ifndef CORE_FPDFAPI_PARSER_FPDF_PARSER_DECODE_H_
#define CORE_FPDFAPI_PARSER_FPDF_PARSER_DECODE_H_
#include <memory>
#include <utility>
#include <vector>
#include "core/fxcrt/fx_memory_wrappers.h"
#include "core/fxcrt/fx_string.h"
#include "core/fxcrt/retain_ptr.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
#include "third_party/base/span.h"
class CPDF_Array;
class CPDF_Dictionary;
class CPDF_Object;
namespace fxcodec {
class ScanlineDecoder;
}
// Indexed by 8-bit char code, contains unicode code points.
extern const uint16_t kPDFDocEncoding[256];
bool ValidateDecoderPipeline(const CPDF_Array* pDecoders);
ByteString PDF_EncodeString(ByteStringView src);
ByteString PDF_HexEncodeString(ByteStringView src);
WideString PDF_DecodeText(pdfium::span<const uint8_t> span);
ByteString PDF_EncodeText(const WideString& str);
std::unique_ptr<fxcodec::ScanlineDecoder> CreateFaxDecoder(
pdfium::span<const uint8_t> src_span,
int width,
int height,
const CPDF_Dictionary* pParams);
std::unique_ptr<fxcodec::ScanlineDecoder> CreateFlateDecoder(
pdfium::span<const uint8_t> src_span,
int width,
int height,
int nComps,
int bpc,
const CPDF_Dictionary* pParams);
bool FlateEncode(pdfium::span<const uint8_t> src_span,
std::unique_ptr<uint8_t, FxFreeDeleter>* dest_buf,
uint32_t* dest_size);
uint32_t FlateDecode(pdfium::span<const uint8_t> src_span,
std::unique_ptr<uint8_t, FxFreeDeleter>* dest_buf,
uint32_t* dest_size);
uint32_t RunLengthDecode(pdfium::span<const uint8_t> src_span,
std::unique_ptr<uint8_t, FxFreeDeleter>* dest_buf,
uint32_t* dest_size);
uint32_t A85Decode(pdfium::span<const uint8_t> src_span,
std::unique_ptr<uint8_t, FxFreeDeleter>* dest_buf,
uint32_t* dest_size);
uint32_t HexDecode(pdfium::span<const uint8_t> src_span,
std::unique_ptr<uint8_t, FxFreeDeleter>* dest_buf,
uint32_t* dest_size);
uint32_t FlateOrLZWDecode(bool bLZW,
pdfium::span<const uint8_t> src_span,
const CPDF_Dictionary* pParams,
uint32_t estimated_size,
std::unique_ptr<uint8_t, FxFreeDeleter>* dest_buf,
uint32_t* dest_size);
// Returns absl::nullopt if the filter in |pDict| is the wrong type or an
// invalid decoder pipeline.
// Returns an empty vector if there is no filter, or if the filter is an empty
// array.
// Otherwise, returns a vector of decoders.
using DecoderArray = std::vector<std::pair<ByteString, const CPDF_Object*>>;
absl::optional<DecoderArray> GetDecoderArray(const CPDF_Dictionary* pDict);
bool PDF_DataDecode(pdfium::span<const uint8_t> src_span,
uint32_t estimated_size,
bool bImageAcc,
const DecoderArray& decoder_array,
std::unique_ptr<uint8_t, FxFreeDeleter>* dest_buf,
uint32_t* dest_size,
ByteString* ImageEncoding,
RetainPtr<const CPDF_Dictionary>* pImageParams);
#endif // CORE_FPDFAPI_PARSER_FPDF_PARSER_DECODE_H_