/*

 * HEIF JPEG 2000 codec.

 * Copyright (c) 2023 Brad Hards <bradh@frogmouth.net>

 *

 * This file is part of libheif.

 *

 * libheif is free software: you can redistribute it and/or modify

 * it under the terms of the GNU Lesser General Public License as

 * published by the Free Software Foundation, either version 3 of

 * the License, or (at your option) any later version.

 *

 * libheif is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with libheif.  If not, see <http://www.gnu.org/licenses/>.

 */

#include "jpeg2000_boxes.h"

#include "api_structs.h"

#include <cstdint>

#include <iostream>

#include <cstdio>

static const uint16_t JPEG2000_CAP_MARKER = 0xFF50;

static const uint16_t JPEG2000_SIZ_MARKER = 0xFF51;

static const uint16_t JPEG2000_SOC_MARKER = 0xFF4F;

Error Box_cdef::parse(BitstreamRange& range, const heif_security_limits* limits)

{

  uint16_t channel_count = range.read16();

  if (limits->max_components && channel_count > limits->max_components) {

    std::stringstream sstr;

    sstr << "cdef box wants to define " << channel_count << " JPEG-2000 channels, but the security limit is set to "

         << limits->max_components << " components";

    return {heif_error_Invalid_input,

            heif_suberror_Security_limit_exceeded,

            sstr.str()};

  }

  if (channel_count > range.get_remaining_bytes() / 6) {

    std::stringstream sstr;

    sstr << "cdef box wants to define " << channel_count << " JPEG-2000 channels, but file only contains "

         << range.get_remaining_bytes() / 6 << " components";

    return {heif_error_Invalid_input,

            heif_suberror_End_of_data,

            sstr.str()};

  }

  m_channels.resize(channel_count);

  for (uint16_t i = 0; i < channel_count && !range.error() && !range.eof(); i++) {

    Channel channel;

    channel.channel_index = range.read16();

    channel.channel_type = range.read16();

    channel.channel_association = range.read16();

    m_channels[i] = channel;

  }

  return range.get_error();

}

std::string Box_cdef::dump(Indent& indent) const

{

  std::ostringstream sstr;

  sstr << Box::dump(indent);

  for (const auto& channel : m_channels) {

    sstr << indent << "channel_index: " << channel.channel_index

         << ", channel_type: " << channel.channel_type

         << ", channel_association: " << channel.channel_association << "\n";

  }

  return sstr.str();

}

Error Box_cdef::write(StreamWriter& writer) const

{

  size_t box_start = reserve_box_header_space(writer);

  writer.write16((uint16_t) m_channels.size());

  for (const auto& channel : m_channels) {

    writer.write16(channel.channel_index);

    writer.write16(channel.channel_type);

    writer.write16(channel.channel_association);

  }

  prepend_header(writer, box_start);

  return Error::Ok;

}

void Box_cdef::set_channels(heif_colorspace colorspace)

{

  // TODO - Check for the presence of a cmap box which specifies channel indices.

  const uint16_t TYPE_COLOR = 0;

  const uint16_t ASOC_GREY = 1;

  const uint16_t ASOC_RED = 1;

  const uint16_t ASOC_GREEN = 2;

  const uint16_t ASOC_BLUE = 3;

  const uint16_t ASOC_Y = 1;

  const uint16_t ASOC_Cb = 2;

  const uint16_t ASOC_Cr = 3;

  switch (colorspace) {

    case heif_colorspace_RGB:

      m_channels.push_back({0, TYPE_COLOR, ASOC_RED});

      m_channels.push_back({1, TYPE_COLOR, ASOC_GREEN});

      m_channels.push_back({2, TYPE_COLOR, ASOC_BLUE});

      break;

    case heif_colorspace_YCbCr:

      m_channels.push_back({0, TYPE_COLOR, ASOC_Y});

      m_channels.push_back({1, TYPE_COLOR, ASOC_Cb});

      m_channels.push_back({2, TYPE_COLOR, ASOC_Cr});

      break;

    case heif_colorspace_monochrome:

      m_channels.push_back({0, TYPE_COLOR, ASOC_GREY});

      break;

    default:

      //TODO - Handle remaining cases.

      break;

  }

}

Error Box_cmap::parse(BitstreamRange& range, const heif_security_limits* limits)

{

  while (!range.eof() && !range.error()) {

    Component component;

    component.component_index = range.read16();

    component.mapping_type = range.read8();

    component.palette_colour = range.read8();

    m_components.push_back(component);

  }

  return range.get_error();

}

std::string Box_cmap::dump(Indent& indent) const

{

  std::ostringstream sstr;

  sstr << Box::dump(indent);

  for (const auto& component : m_components) {

    sstr << indent << "component_index: " << component.component_index

         << ", mapping_type: " << (int) (component.mapping_type)

         << ", palette_colour: " << (int) (component.palette_colour) << "\n";

  }

  return sstr.str();

}

Error Box_cmap::write(StreamWriter& writer) const

{

  size_t box_start = reserve_box_header_space(writer);

  for (const auto& component : m_components) {

    writer.write16(component.component_index);

    writer.write8(component.mapping_type);

    writer.write8(component.palette_colour);

  }

  prepend_header(writer, box_start);

  return Error::Ok;

}

Error Box_pclr::parse(BitstreamRange& range, const heif_security_limits* limits)

{

  uint16_t num_entries = range.read16();

  uint8_t num_palette_columns = range.read8();

  for (uint8_t i = 0; i < num_palette_columns; i++) {

    uint8_t bit_depth = range.read8();

    if (bit_depth & 0x80) {

      return Error(heif_error_Unsupported_feature,

                   heif_suberror_Unsupported_data_version,

                   "pclr with signed data is not supported");

    }

    if (bit_depth > 16) {

      return Error(heif_error_Unsupported_feature,

                   heif_suberror_Unsupported_data_version,

                   "pclr more than 16 bits per channel is not supported");

    }

    m_bitDepths.push_back(bit_depth);

  }

  for (uint16_t j = 0; j < num_entries; j++) {

    PaletteEntry entry;

    for (unsigned long int i = 0; i < entry.columns.size(); i++) {

      if (m_bitDepths[i] <= 8) {

        entry.columns.push_back(range.read8());

      }

      else {

        entry.columns.push_back(range.read16());

      }

    }

    m_entries.push_back(entry);

  }

  return range.get_error();

}

std::string Box_pclr::dump(Indent& indent) const

{

  std::ostringstream sstr;

  sstr << Box::dump(indent);

  sstr << indent << "NE: " << m_entries.size();

  sstr << ", NPC: " << (int) get_num_columns();

  sstr << ", B: ";

  for (uint8_t b : m_bitDepths) {

    sstr << (int) b << ", ";

  }

  // TODO: maybe dump entries too?

  sstr << "\n";

  return sstr.str();

}

Error Box_pclr::write(StreamWriter& writer) const

{

  if (get_num_columns() == 0) {

    // skip

    return Error::Ok;

  }

  size_t box_start = reserve_box_header_space(writer);

  writer.write16(get_num_entries());

  writer.write8(get_num_columns());

  for (uint8_t b : m_bitDepths) {

    writer.write8(b);

  }

  for (PaletteEntry entry : m_entries) {

    for (unsigned long int i = 0; i < entry.columns.size(); i++) {

      if (m_bitDepths[i] <= 8) {

        writer.write8((uint8_t) (entry.columns[i]));

      }

      else {

        writer.write16(entry.columns[i]);

      }

    }

  }

  prepend_header(writer, box_start);

  return Error::Ok;

}

void Box_pclr::set_columns(uint8_t num_columns, uint8_t bit_depth)

{

  m_bitDepths.clear();

  m_entries.clear();

  for (int i = 0; i < num_columns; i++) {

    m_bitDepths.push_back(bit_depth);

  }

}

Error Box_j2kL::parse(BitstreamRange& range, const heif_security_limits* limits)

{

  uint16_t layer_count = range.read16();

  if (layer_count > range.get_remaining_bytes() / (2+1+2)) {

    std::stringstream sstr;

    sstr << "j2kL box wants to define " << layer_count << "JPEG-2000 layers, but the box only contains "

         << range.get_remaining_bytes() / (2 + 1 + 2) << " layers entries";

    return {heif_error_Invalid_input,

            heif_suberror_End_of_data,

            sstr.str()};

  }

  m_layers.resize(layer_count);

  for (int i = 0; i < layer_count && !range.error() && !range.eof(); i++) {

    Layer layer;

    layer.layer_id = range.read16();

    layer.discard_levels = range.read8();

    layer.decode_layers = range.read16();

    m_layers[i] = layer;

  }

  if (range.get_error()) {

    m_layers.clear();

  }

  return range.get_error();

}

std::string Box_j2kL::dump(Indent& indent) const

{

  std::ostringstream sstr;

  sstr << Box::dump(indent);

  for (const auto& layer : m_layers) {

    sstr << indent << "layer_id: " << layer.layer_id

         << ", discard_levels: " << (int) (layer.discard_levels)

         << ", decode_layers: " << layer.decode_layers << "\n";

  }

  return sstr.str();

}

Error Box_j2kL::write(StreamWriter& writer) const

{

  size_t box_start = reserve_box_header_space(writer);

  writer.write16((uint16_t) m_layers.size());

  for (const auto& layer : m_layers) {

    writer.write16(layer.layer_id);

    writer.write8(layer.discard_levels);

    writer.write16(layer.decode_layers);

  }

  prepend_header(writer, box_start);

  return Error::Ok;

}

Error Box_j2kH::parse(BitstreamRange& range, const heif_security_limits* limits)

{

  return read_children(range, READ_CHILDREN_ALL, limits);

}

std::string Box_j2kH::dump(Indent& indent) const

{

  std::ostringstream sstr;

  sstr << Box::dump(indent);

  sstr << dump_children(indent);

  return sstr.str();

}

Error JPEG2000MainHeader::parseHeader(const std::vector<uint8_t>& compressedImageData)

{

  // TODO: it is very inefficient to store the whole image data when we only need the header

  headerData = compressedImageData;

  return doParse();

}

Error JPEG2000MainHeader::doParse()

{

  cursor = 0;

  Error err = parse_SOC_segment();

  if (err) {

    return err;

  }

  err = parse_SIZ_segment();

  if (err) {

    return err;

  }

  if (cursor < headerData.size() - MARKER_LEN) {

    uint16_t marker = read16();

    if (marker == JPEG2000_CAP_MARKER) {

      return parse_CAP_segment_body();

    }

    return Error::Ok;

  }

  // we should have at least COD and QCD, so this is probably broken.

  return Error(heif_error_Invalid_input,

               heif_suberror_Invalid_J2K_codestream,

               std::string("Missing required header marker(s)"));

}

Error JPEG2000MainHeader::parse_SOC_segment()

{

  const size_t REQUIRED_BYTES = MARKER_LEN;

  if ((headerData.size() < REQUIRED_BYTES) || (cursor > (headerData.size() - REQUIRED_BYTES))) {

    return Error(heif_error_Invalid_input,

                 heif_suberror_Invalid_J2K_codestream);

  }

  uint16_t marker = read16();

  if (marker == JPEG2000_SOC_MARKER) {

    return Error::Ok;

  }

  return Error(heif_error_Invalid_input,

               heif_suberror_Invalid_J2K_codestream,

               std::string("Missing required SOC Marker"));

}

Error JPEG2000MainHeader::parse_SIZ_segment()

{

  size_t REQUIRED_BYTES = MARKER_LEN + 38 + 3 * 1;

  if ((headerData.size() < REQUIRED_BYTES) || (cursor > (headerData.size() - REQUIRED_BYTES))) {

    return Error(heif_error_Invalid_input,

                 heif_suberror_Invalid_J2K_codestream);

  }

  uint16_t marker = read16();

  if (marker != JPEG2000_SIZ_MARKER) {

    return Error(heif_error_Invalid_input,

                 heif_suberror_Invalid_J2K_codestream,

                 std::string("Missing required SIZ Marker"));

  }

  uint16_t lsiz = read16();

  if ((lsiz < 41) || (lsiz > 49190)) {

    return Error(heif_error_Invalid_input,

                 heif_suberror_Invalid_J2K_codestream,

                 std::string("Out of range Lsiz value"));

  }

  siz.decoder_capabilities = read16();

  siz.reference_grid_width = read32();

  siz.reference_grid_height = read32();

  siz.image_horizontal_offset = read32();

  siz.image_vertical_offset = read32();

  siz.tile_width = read32();

  siz.tile_height = read32();

  siz.tile_offset_x = read32();

  siz.tile_offset_y = read32();

  uint16_t csiz = read16();

  if ((csiz < 1) || (csiz > 16384)) {

    return Error(heif_error_Invalid_input,

                 heif_suberror_Invalid_J2K_codestream,

                 std::string("Out of range Csiz value"));

  }

  if (3 * static_cast<size_t>(csiz) > headerData.size() - cursor) {

    return Error(heif_error_Invalid_input,

                 heif_suberror_Invalid_J2K_codestream);

  }

  // TODO: consider checking for Lsiz consistent with Csiz

  for (uint16_t c = 0; c < csiz; c++) {

    JPEG2000_SIZ_segment::component comp;

    uint8_t ssiz = read8();

    comp.is_signed = (ssiz & 0x80);

    comp.precision = uint8_t((ssiz & 0x7F) + 1);

    comp.h_separation = read8();

    comp.v_separation = read8();

    siz.components.push_back(comp);

  }

  return Error::Ok;

}

Error JPEG2000MainHeader::parse_CAP_segment_body()

{

  // Need at least Lcap (2) + Pcap (4) = 6 bytes.

  if (headerData.size() - cursor < 6) {

    return Error(heif_error_Invalid_input,

                 heif_suberror_Invalid_J2K_codestream);

  }

  uint16_t lcap = read16();

  if ((lcap < 8) || (lcap > 70)) {

    return Error(heif_error_Invalid_input,

                 heif_suberror_Invalid_J2K_codestream,

                 std::string("Out of range Lcap value"));

  }

  // Lcap counts the Lcap field itself, so Lcap-2 bytes must follow it.

  if (headerData.size() - cursor < static_cast<size_t>(lcap) - 2) {

    return Error(heif_error_Invalid_input,

                 heif_suberror_Invalid_J2K_codestream);

  }

  uint32_t pcap = read32();

  size_t segment_end = cursor + (static_cast<size_t>(lcap) - 6);

  for (uint8_t i = 2; i <= 32; i++) {

    if (pcap & (1u << (32 - i))) {

      if (segment_end - cursor < 2) {

        return Error(heif_error_Invalid_input,

                     heif_suberror_Invalid_J2K_codestream,

                     std::string("CAP segment Pcap inconsistent with Lcap"));

      }

      switch (i) {

        case JPEG2000_Extension_Capability_HT::IDENT:

          parse_Ccap15();

          break;

        default:

          read16();

      }

    }

  }

  return Error::Ok;

}

void JPEG2000MainHeader::parse_Ccap15()

{

  uint16_t val = read16();

  JPEG2000_Extension_Capability_HT ccap;

  // We could parse more here, but we don't need that yet.

  ccap.setValue(val);

  cap.push_back(ccap);

}

heif_chroma JPEG2000MainHeader::get_chroma_format() const

{

  // Y-plane must be full resolution

  if (siz.components[0].h_separation != 1 || siz.components[0].v_separation != 1) {

    return heif_chroma_undefined;

  }

  if (siz.components.size() == 1) {

    return heif_chroma_monochrome;

  }

  else if (siz.components.size() == 3) {

    // TODO: we should map channels through `cdef` ?

    // both chroma components must have the same sampling

    if (siz.components[1].h_separation != siz.components[2].h_separation ||

        siz.components[1].v_separation != siz.components[2].v_separation) {

      return heif_chroma_undefined;

    }

    if (siz.components[1].h_separation == 2 && siz.components[1].v_separation==2) {

      return heif_chroma_420;

    }

    if (siz.components[1].h_separation == 2 && siz.components[1].v_separation==1) {

      return heif_chroma_422;

    }

    if (siz.components[1].h_separation == 1 && siz.components[1].v_separation==1) {

      return heif_chroma_444;

    }

  }

  return heif_chroma_undefined;

}