mirror of
https://github.com/google/sandboxed-api.git
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294 lines
9.0 KiB
C++
294 lines
9.0 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "guetzli_entry_points.h" // NOLINT(build/include)
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#include <sys/stat.h>
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#include <algorithm>
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#include <cstdio>
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#include <iostream>
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#include <string>
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#include <vector>
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#include "guetzli/jpeg_data_reader.h"
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#include "guetzli/quality.h"
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#include "png.h" // NOLINT(build/include)
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#include "sandboxed_api/sandbox2/util/fileops.h"
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#include "sandboxed_api/util/statusor.h"
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namespace {
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constexpr int kBytesPerPixel = 350;
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constexpr int kLowestMemusageMB = 100;
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struct GuetzliInitData {
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std::string in_data;
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guetzli::Params params;
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guetzli::ProcessStats stats;
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};
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struct ImageData {
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int xsize;
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int ysize;
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std::vector<uint8_t> rgb;
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};
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sapi::LenValStruct CreateLenValFromData(const void* data, size_t size) {
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void* new_data = malloc(size);
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memcpy(new_data, data, size);
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return {size, new_data};
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}
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sapi::StatusOr<std::string> ReadFromFd(int fd) {
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struct stat file_data;
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int status = fstat(fd, &file_data);
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if (status < 0) {
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return absl::FailedPreconditionError("Error reading input from fd");
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}
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std::string result;
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result.resize(file_data.st_size);
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status = read(fd, result.data(), result.size());
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if (status < 0) {
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return absl::FailedPreconditionError("Error reading input from fd");
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}
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return result;
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}
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sapi::StatusOr<GuetzliInitData> PrepareDataForProcessing(
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const ProcessingParams& processing_params) {
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sapi::StatusOr<std::string> input = ReadFromFd(processing_params.remote_fd);
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if (!input.ok()) {
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return input.status();
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}
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guetzli::Params guetzli_params;
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guetzli_params.butteraugli_target = static_cast<float>(
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guetzli::ButteraugliScoreForQuality(processing_params.quality));
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guetzli::ProcessStats stats;
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if (processing_params.verbose) {
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stats.debug_output_file = stderr;
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}
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return GuetzliInitData{std::move(input.value()), guetzli_params, stats};
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}
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inline uint8_t BlendOnBlack(const uint8_t val, const uint8_t alpha) {
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return (static_cast<int>(val) * static_cast<int>(alpha) + 128) / 255;
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}
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// Modified version of ReadPNG from original guetzli.cc
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sapi::StatusOr<ImageData> ReadPNG(const std::string& data) {
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std::vector<uint8_t> rgb;
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int xsize, ysize;
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png_structp png_ptr =
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png_create_read_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
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if (!png_ptr) {
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return absl::FailedPreconditionError(
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"Error reading PNG data from input file");
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}
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png_infop info_ptr = png_create_info_struct(png_ptr);
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if (!info_ptr) {
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png_destroy_read_struct(&png_ptr, nullptr, nullptr);
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return absl::FailedPreconditionError(
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"Error reading PNG data from input file");
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}
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if (setjmp(png_jmpbuf(png_ptr)) != 0) {
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// Ok we are here because of the setjmp.
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png_destroy_read_struct(&png_ptr, &info_ptr, nullptr);
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return absl::FailedPreconditionError(
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"Error reading PNG data from input file");
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}
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std::istringstream memstream(data, std::ios::in | std::ios::binary);
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png_set_read_fn(
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png_ptr, static_cast<void*>(&memstream),
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[](png_structp png_ptr, png_bytep outBytes, png_size_t byteCountToRead) {
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std::istringstream& memstream =
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*static_cast<std::istringstream*>(png_get_io_ptr(png_ptr));
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memstream.read(reinterpret_cast<char*>(outBytes), byteCountToRead);
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if (memstream.eof()) png_error(png_ptr, "unexpected end of data");
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if (memstream.fail()) png_error(png_ptr, "read from memory error");
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});
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// The png_transforms flags are as follows:
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// packing == convert 1,2,4 bit images,
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// strip == 16 -> 8 bits / channel,
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// shift == use sBIT dynamics, and
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// expand == palettes -> rgb, grayscale -> 8 bit images, tRNS -> alpha.
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const unsigned int png_transforms =
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PNG_TRANSFORM_PACKING | PNG_TRANSFORM_EXPAND | PNG_TRANSFORM_STRIP_16;
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png_read_png(png_ptr, info_ptr, png_transforms, nullptr);
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png_bytep* row_pointers = png_get_rows(png_ptr, info_ptr);
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xsize = png_get_image_width(png_ptr, info_ptr);
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ysize = png_get_image_height(png_ptr, info_ptr);
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rgb.resize(3 * xsize * ysize);
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const int components = png_get_channels(png_ptr, info_ptr);
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switch (components) {
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case 1: {
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// GRAYSCALE
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for (int y = 0; y < ysize; ++y) {
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const uint8_t* row_in = row_pointers[y];
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uint8_t* row_out = &rgb[3 * y * xsize];
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for (int x = 0; x < xsize; ++x) {
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const uint8_t gray = row_in[x];
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row_out[3 * x + 0] = gray;
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row_out[3 * x + 1] = gray;
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row_out[3 * x + 2] = gray;
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}
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}
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break;
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}
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case 2: {
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// GRAYSCALE + ALPHA
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for (int y = 0; y < ysize; ++y) {
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const uint8_t* row_in = row_pointers[y];
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uint8_t* row_out = &rgb[3 * y * xsize];
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for (int x = 0; x < xsize; ++x) {
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const uint8_t gray = BlendOnBlack(row_in[2 * x], row_in[2 * x + 1]);
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row_out[3 * x + 0] = gray;
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row_out[3 * x + 1] = gray;
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row_out[3 * x + 2] = gray;
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}
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}
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break;
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}
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case 3: {
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// RGB
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for (int y = 0; y < ysize; ++y) {
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const uint8_t* row_in = row_pointers[y];
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uint8_t* row_out = &rgb[3 * y * xsize];
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memcpy(row_out, row_in, 3 * xsize);
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}
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break;
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}
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case 4: {
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// RGBA
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for (int y = 0; y < ysize; ++y) {
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const uint8_t* row_in = row_pointers[y];
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uint8_t* row_out = &rgb[3 * y * xsize];
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for (int x = 0; x < xsize; ++x) {
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const uint8_t alpha = row_in[4 * x + 3];
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row_out[3 * x + 0] = BlendOnBlack(row_in[4 * x + 0], alpha);
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row_out[3 * x + 1] = BlendOnBlack(row_in[4 * x + 1], alpha);
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row_out[3 * x + 2] = BlendOnBlack(row_in[4 * x + 2], alpha);
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}
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}
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break;
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}
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default:
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png_destroy_read_struct(&png_ptr, &info_ptr, nullptr);
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return absl::FailedPreconditionError(
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"Error reading PNG data from input file");
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}
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png_destroy_read_struct(&png_ptr, &info_ptr, nullptr);
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return ImageData{xsize, ysize, std::move(rgb)};
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}
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bool CheckMemoryLimitExceeded(int memlimit_mb, int xsize, int ysize) {
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double pixels = static_cast<double>(xsize) * ysize;
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return memlimit_mb != -1 &&
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(pixels * kBytesPerPixel / (1 << 20) > memlimit_mb ||
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memlimit_mb < kLowestMemusageMB);
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}
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} // namespace
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extern "C" bool ProcessJpeg(const ProcessingParams* processing_params,
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sapi::LenValStruct* output) {
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auto processing_data = PrepareDataForProcessing(*processing_params);
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if (!processing_data.ok()) {
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std::cerr << processing_data.status().ToString() << std::endl;
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return false;
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}
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guetzli::JPEGData jpg_header;
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if (!guetzli::ReadJpeg(processing_data->in_data, guetzli::JPEG_READ_HEADER,
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&jpg_header)) {
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std::cerr << "Error reading JPG data from input file" << std::endl;
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return false;
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}
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if (CheckMemoryLimitExceeded(processing_params->memlimit_mb, jpg_header.width,
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jpg_header.height)) {
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std::cerr << "Memory limit would be exceeded" << std::endl;
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return false;
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}
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std::string out_data;
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if (!guetzli::Process(processing_data->params, &processing_data->stats,
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processing_data->in_data, &out_data)) {
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std::cerr << "Guezli processing failed" << std::endl;
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return false;
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}
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*output = CreateLenValFromData(out_data.data(), out_data.size());
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return true;
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}
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extern "C" bool ProcessRgb(const ProcessingParams* processing_params,
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sapi::LenValStruct* output) {
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auto processing_data = PrepareDataForProcessing(*processing_params);
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if (!processing_data.ok()) {
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std::cerr << processing_data.status().ToString() << std::endl;
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return false;
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}
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auto png_data = ReadPNG(processing_data->in_data);
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if (!png_data.ok()) {
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std::cerr << "Error reading PNG data from input file" << std::endl;
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return false;
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}
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if (CheckMemoryLimitExceeded(processing_params->memlimit_mb, png_data->xsize,
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png_data->ysize)) {
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std::cerr << "Memory limit would be exceeded" << std::endl;
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return false;
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}
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std::string out_data;
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if (!guetzli::Process(processing_data->params, &processing_data->stats,
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png_data->rgb, png_data->xsize, png_data->ysize,
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&out_data)) {
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std::cerr << "Guetzli processing failed" << std::endl;
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return false;
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}
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*output = CreateLenValFromData(out_data.data(), out_data.size());
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return true;
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}
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extern "C" bool WriteDataToFd(int fd, sapi::LenValStruct* data) {
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return sandbox2::file_util::fileops::WriteToFD(
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fd, static_cast<const char*>(data->data), data->size);
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}
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