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Add misc things needed for loading textures

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This commit is contained in:
Magnus Norddahl 2024-02-29 21:09:28 +01:00
parent 847ffe030b
commit ffca8b5b6c
10 changed files with 1488 additions and 0 deletions
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9
CMakeLists.txt
View file

@ -30,6 +30,12 @@ set(ZDRAY_SOURCES
src/framework/bounds.h
src/framework/textureid.cpp
src/framework/textureid.h
src/framework/zipreader.cpp
src/framework/zipreader.h
src/framework/file.cpp
src/framework/file.h
src/framework/utf16.cpp
src/framework/utf16.h
src/blockmapbuilder/blockmapbuilder.cpp
src/blockmapbuilder/blockmapbuilder.h
src/level/level.cpp
@ -107,6 +113,8 @@ set(THIRDPARTY_SOURCES
${CMAKE_SOURCE_DIR}/thirdparty/dp_rect_pack/dp_rect_pack.h
${CMAKE_SOURCE_DIR}/thirdparty/miniz/miniz.h
${CMAKE_SOURCE_DIR}/thirdparty/miniz/miniz.c
${CMAKE_SOURCE_DIR}/thirdparty/picopng/picopng.cpp
${CMAKE_SOURCE_DIR}/thirdparty/picopng/picopng.h
)
set(ZDRAY_LIBS
@ -130,6 +138,7 @@ source_group("src\\Models" REGULAR_EXPRESSION "^${CMAKE_CURRENT_SOURCE_DIR}/src/
source_group("thirdparty" REGULAR_EXPRESSION "${CMAKE_CURRENT_SOURCE_DIR}/thirdparty/.+")
source_group("thirdparty\\dp_rect_pack" REGULAR_EXPRESSION "${CMAKE_CURRENT_SOURCE_DIR}/thirdparty/dp_rect_pack/.+")
source_group("thirdparty\\miniz" REGULAR_EXPRESSION "${CMAKE_CURRENT_SOURCE_DIR}/thirdparty/miniz/.+")
source_group("thirdparty\\picopng" REGULAR_EXPRESSION "${CMAKE_CURRENT_SOURCE_DIR}/thirdparty/picopng/.+")
include_directories( src "${CMAKE_CURRENT_SOURCE_DIR}/thirdparty/ZVulkan/include" "${CMAKE_CURRENT_SOURCE_DIR}/thirdparty" )

603
src/framework/file.cpp Normal file
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@ -0,0 +1,603 @@
#include "File.h"
#include "UTF16.h"
#include <stdexcept>
#ifndef WIN32
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <libgen.h>
#endif
#ifdef WIN32
#define NOMINMAX
#include <Windows.h>
class FileImpl : public File
{
public:
FileImpl(HANDLE handle) : handle(handle)
{
}
~FileImpl()
{
CloseHandle(handle);
}
void write(const void* data, size_t size) override
{
size_t pos = 0;
while (pos < size)
{
size_t writesize = std::min(size, (size_t)0xffffffff);
BOOL result = WriteFile(handle, (const uint8_t*)data + pos, (DWORD)writesize, nullptr, nullptr);
if (result == FALSE)
throw std::runtime_error("WriteFile failed");
pos += writesize;
}
}
void read(void* data, size_t size) override
{
size_t pos = 0;
while (pos < size)
{
size_t readsize = std::min(size, (size_t)0xffffffff);
DWORD bytesRead = 0;
BOOL result = ReadFile(handle, (uint8_t*)data + pos, (DWORD)readsize, &bytesRead, nullptr);
if (result == FALSE || bytesRead != readsize)
throw std::runtime_error("ReadFile failed");
pos += readsize;
}
}
int64_t size() override
{
LARGE_INTEGER fileSize;
BOOL result = GetFileSizeEx(handle, &fileSize);
if (result == FALSE)
throw std::runtime_error("GetFileSizeEx failed");
return fileSize.QuadPart;
}
void seek(int64_t offset, SeekPoint origin) override
{
LARGE_INTEGER off, newoff;
off.QuadPart = offset;
DWORD moveMethod = FILE_BEGIN;
if (origin == SeekPoint::current) moveMethod = FILE_CURRENT;
else if (origin == SeekPoint::end) moveMethod = FILE_END;
BOOL result = SetFilePointerEx(handle, off, &newoff, moveMethod);
if (result == FALSE)
throw std::runtime_error("SetFilePointerEx failed");
}
uint64_t tell() override
{
LARGE_INTEGER offset, delta;
delta.QuadPart = 0;
BOOL result = SetFilePointerEx(handle, delta, &offset, FILE_CURRENT);
if (result == FALSE)
throw std::runtime_error("SetFilePointerEx failed");
return offset.QuadPart;
}
HANDLE handle = INVALID_HANDLE_VALUE;
};
std::shared_ptr<File> File::create_always(const std::string& filename)
{
HANDLE handle = CreateFileW(to_utf16(filename).c_str(), FILE_WRITE_ACCESS, 0, 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
if (handle == INVALID_HANDLE_VALUE)
throw std::runtime_error("Could not create " + filename);
return std::make_shared<FileImpl>(handle);
}
std::shared_ptr<File> File::open_existing(const std::string& filename)
{
HANDLE handle = CreateFileW(to_utf16(filename).c_str(), FILE_READ_ACCESS, FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
if (handle == INVALID_HANDLE_VALUE)
throw std::runtime_error("Could not open " + filename);
return std::make_shared<FileImpl>(handle);
}
#else
#include <stdio.h>
class FileImpl : public File
{
public:
FileImpl(FILE* handle) : handle(handle)
{
}
~FileImpl()
{
fclose(handle);
}
void write(const void* data, size_t size) override
{
size_t result = fwrite(data, 1, size, handle);
if (result != size)
throw std::runtime_error("File write failed");
}
void read(void* data, size_t size) override
{
size_t result = fread(data, 1, size, handle);
if (result != size)
throw std::runtime_error("File read failed");
}
int64_t size() override
{
auto pos = ftell(handle);
auto result = fseek(handle, 0, SEEK_END);
if (result == -1)
throw std::runtime_error("File seek failed");
auto length = ftell(handle);
fseek(handle, pos, SEEK_SET);
if (length == -1)
throw std::runtime_error("File tell failed");
return length;
}
void seek(int64_t offset, SeekPoint origin) override
{
if (origin == SeekPoint::current)
{
auto result = fseek(handle, offset, SEEK_CUR);
if (result == -1)
throw std::runtime_error("File seek failed");
}
else if (origin == SeekPoint::end)
{
auto result = fseek(handle, offset, SEEK_END);
if (result == -1)
throw std::runtime_error("File seek failed");
}
else
{
auto result = fseek(handle, offset, SEEK_SET);
if (result == -1)
throw std::runtime_error("File seek failed");
}
}
uint64_t tell() override
{
auto result = ftell(handle);
if (result == -1)
throw std::runtime_error("File tell failed");
return result;
}
FILE* handle = nullptr;
};
std::shared_ptr<File> File::create_always(const std::string& filename)
{
FILE* handle = fopen(filename.c_str(), "wb");
if (!handle)
throw std::runtime_error("Could not create " + filename);
return std::make_shared<FileImpl>(handle);
}
std::shared_ptr<File> File::open_existing(const std::string& filename)
{
FILE* handle = fopen(filename.c_str(), "rb");
if (!handle)
throw std::runtime_error("Could not open " + filename);
return std::make_shared<FileImpl>(handle);
}
#endif
void File::write_all_bytes(const std::string& filename, const void* data, size_t size)
{
auto file = create_always(filename);
file->write(data, size);
}
void File::write_all_text(const std::string& filename, const std::string& text)
{
auto file = create_always(filename);
file->write(text.data(), text.size());
}
std::vector<uint8_t> File::read_all_bytes(const std::string& filename)
{
auto file = open_existing(filename);
std::vector<uint8_t> buffer(file->size());
file->read(buffer.data(), buffer.size());
return buffer;
}
std::string File::read_all_text(const std::string& filename)
{
auto file = open_existing(filename);
auto size = file->size();
if (size == 0) return {};
std::string buffer;
buffer.resize(size);
file->read(&buffer[0], buffer.size());
return buffer;
}
int64_t File::get_last_write_time(const std::string& filename)
{
#ifdef WIN32
HANDLE handle = CreateFileW(to_utf16(filename).c_str(), GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
if (handle == INVALID_HANDLE_VALUE)
throw std::runtime_error("Could not open " + filename);
FILETIME filetime = {};
BOOL result = GetFileTime(handle, nullptr, nullptr, &filetime);
CloseHandle(handle);
if (result == FALSE)
throw std::runtime_error("GetFileTime failed for " + filename);
LARGE_INTEGER li;
li.LowPart = filetime.dwLowDateTime;
li.HighPart = filetime.dwHighDateTime;
return li.QuadPart;
#else
throw std::runtime_error("File::get_last_write_time not implemented");
#endif
}
bool File::try_remove(const std::string& filename)
{
#ifdef WIN32
return DeleteFileW(to_utf16(filename).c_str()) == TRUE;
#else
throw std::runtime_error("File::try_remove not implemented");
#endif
}
/////////////////////////////////////////////////////////////////////////////
std::vector<std::string> Directory::files(const std::string& filename)
{
#ifdef WIN32
std::vector<std::string> files;
WIN32_FIND_DATAW fileinfo;
HANDLE handle = FindFirstFileW(to_utf16(filename).c_str(), &fileinfo);
if (handle == INVALID_HANDLE_VALUE)
return {};
try
{
do
{
bool is_directory = !!(fileinfo.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY);
if (!is_directory)
files.push_back(from_utf16(fileinfo.cFileName));
} while (FindNextFileW(handle, &fileinfo) == TRUE);
FindClose(handle);
}
catch (...)
{
FindClose(handle);
throw;
}
return files;
#else
throw std::runtime_error("Directory::files not implemented");
#endif
}
std::vector<std::string> Directory::folders(const std::string& filename)
{
#ifdef WIN32
std::vector<std::string> files;
WIN32_FIND_DATAW fileinfo;
HANDLE handle = FindFirstFileW(to_utf16(filename).c_str(), &fileinfo);
if (handle == INVALID_HANDLE_VALUE)
return {};
try
{
do
{
bool is_directory = !!(fileinfo.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY);
if (is_directory)
{
files.push_back(from_utf16(fileinfo.cFileName));
if (files.back() == "." || files.back() == "..")
files.pop_back();
}
} while (FindNextFileW(handle, &fileinfo) == TRUE);
FindClose(handle);
}
catch (...)
{
FindClose(handle);
throw;
}
return files;
#else
throw std::runtime_error("Directory::folders not implemented");
#endif
}
#ifdef WIN32
std::string Directory::exe_path()
{
WCHAR exe_filename[1024];
DWORD len = GetModuleFileNameW(nullptr, exe_filename, 1024);
if (len == 0 || len == 1024)
throw std::runtime_error("GetModuleFileName failed!");
return FilePath::remove_last_component(from_utf16(exe_filename));
}
#else
std::string Directory::exe_path()
{
char exe_file[PATH_MAX];
#ifdef __APPLE__
CFBundleRef mainBundle = CFBundleGetMainBundle();
if (mainBundle)
{
CFURLRef mainURL = CFBundleCopyBundleURL(mainBundle);
if (mainURL)
{
int ok = CFURLGetFileSystemRepresentation(
mainURL, (Boolean)true, (UInt8*)exe_file, PATH_MAX
);
if (ok)
{
return std::string(exe_file) + "/";
}
}
}
throw std::runtime_error("get_exe_path failed");
#else
#ifndef PROC_EXE_PATH
#define PROC_EXE_PATH "/proc/self/exe"
#endif
int size;
struct stat sb;
if (lstat(PROC_EXE_PATH, &sb) < 0)
{
#ifdef EXTERN___PROGNAME
char* pathenv, * name, * end;
char fname[PATH_MAX];
char cwd[PATH_MAX];
struct stat sba;
exe_file[0] = '\0';
if ((pathenv = getenv("PATH")) != nullptr)
{
for (name = pathenv; name; name = end)
{
if ((end = strchr(name, ':')))
*end++ = '\0';
snprintf(fname, sizeof(fname),
"%s/%s", name, (char*)__progname);
if (stat(fname, &sba) == 0) {
snprintf(exe_file, sizeof(exe_file),
"%s/", name);
break;
}
}
}
// if getenv failed or path still not found
// try current directory as last resort
if (!exe_file[0])
{
if (getcwd(cwd, sizeof(cwd)) != nullptr)
{
snprintf(fname, sizeof(fname),
"%s/%s", cwd, (char*)__progname);
if (stat(fname, &sba) == 0)
snprintf(exe_file, sizeof(exe_file),
"%s/", cwd);
}
}
if (!exe_file[0])
throw std::runtime_error("get_exe_path: could not find path");
else
return std::string(exe_file);
#else
throw std::runtime_error("get_exe_path: proc file system not accesible");
#endif
}
else
{
size = readlink(PROC_EXE_PATH, exe_file, PATH_MAX);
if (size < 0)
{
throw std::runtime_error(strerror(errno));
}
else
{
exe_file[size] = '\0';
return std::string(dirname(exe_file)) + "/";
}
}
#endif
}
#endif
void Directory::create(const std::string& path)
{
#ifdef WIN32
BOOL result = CreateDirectoryW(to_utf16(path).c_str(), nullptr);
if (result == FALSE)
{
DWORD error = GetLastError();
if (error == ERROR_ALREADY_EXISTS)
{
return;
}
else if (error == ERROR_PATH_NOT_FOUND)
{
try
{
std::string parent = FilePath::remove_last_component(path);
if (!parent.empty())
{
Directory::create(parent);
if (CreateDirectoryW(to_utf16(path).c_str(), nullptr) == TRUE)
return;
}
}
catch (...)
{
}
}
throw std::runtime_error("Could not create directory for path " + path);
}
#else
throw std::runtime_error("Directory::create not implemented");
#endif
}
/////////////////////////////////////////////////////////////////////////////
bool FilePath::has_extension(const std::string &filename, const char *checkext)
{
auto fileext = extension(filename);
#ifdef WIN32
return _stricmp(fileext.c_str(), checkext) == 0;
#else
return strcasecmp(fileext.c_str(), checkext) == 0;
#endif
}
std::string FilePath::extension(const std::string &filename)
{
std::string file = last_component(filename);
std::string::size_type pos = file.find_last_of('.');
if (pos == std::string::npos)
return std::string();
#ifndef WIN32
// Files beginning with a dot is not a filename extension in Unix.
// This is different from Windows where it is considered the extension.
if (pos == 0)
return std::string();
#endif
return file.substr(pos + 1);
}
std::string FilePath::remove_extension(const std::string &filename)
{
std::string file = last_component(filename);
std::string::size_type pos = file.find_last_of('.');
if (pos == std::string::npos)
return filename;
else
return filename.substr(0, filename.length() - file.length() + pos);
}
std::string FilePath::last_component(const std::string &path)
{
#ifdef WIN32
auto last_slash = path.find_last_of("/\\");
if (last_slash != std::string::npos)
return path.substr(last_slash + 1);
else
return path;
#else
auto last_slash = path.find_last_of('/');
if (last_slash != std::string::npos)
return path.substr(last_slash + 1);
else
return path;
#endif
}
std::string FilePath::remove_last_component(const std::string &path)
{
#ifdef WIN32
auto last_slash = path.find_last_of("/\\");
if (last_slash != std::string::npos)
return path.substr(0, last_slash);
else
return std::string();
#else
auto last_slash = path.find_last_of('/');
if (last_slash != std::string::npos)
return path.substr(0, last_slash + 1);
else
return std::string();
#endif
}
std::string FilePath::combine(const std::string &path1, const std::string &path2)
{
#ifdef WIN32
if (path1.empty())
return path2;
else if (path2.empty())
return path1;
else if (path2.front() == '/' || path2.front() == '\\')
return path2;
else if (path1.back() != '/' && path1.back() != '\\')
return path1 + "\\" + path2;
else
return path1 + path2;
#else
if (path1.empty())
return path2;
else if (path2.empty())
return path1;
else if (path2.front() == '/')
return path2;
else if (path1.back() != '/')
return path1 + "/" + path2;
else
return path1 + path2;
#endif
}
std::string FilePath::force_filesys_slash(std::string path)
{
#ifdef WIN32
return force_backslash(std::move(path));
#else
return force_slash(std::move(path));
#endif
}
std::string FilePath::force_slash(std::string path)
{
for (char& c : path)
{
if (c == '\\') c = '/';
}
return path;
}
std::string FilePath::force_backslash(std::string path)
{
for (char& c : path)
{
if (c == '/') c = '\\';
}
return path;
}

67
src/framework/file.h Normal file
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@ -0,0 +1,67 @@
#pragma once
#include <memory>
#include <string>
#include <vector>
#include <cstdint>
enum class SeekPoint
{
begin,
current,
end
};
class File
{
public:
static std::shared_ptr<File> create_always(const std::string &filename);
static std::shared_ptr<File> open_existing(const std::string &filename);
static void write_all_bytes(const std::string& filename, const void* data, size_t size);
static void write_all_text(const std::string& filename, const std::string& text);
static std::vector<uint8_t> read_all_bytes(const std::string& filename);
static std::string read_all_text(const std::string& filename);
static int64_t get_last_write_time(const std::string& filename);
static bool try_remove(const std::string& filename);
uint8_t read_uint8() { uint8_t v; read(&v, sizeof(uint8_t)); return v; }
int8_t read_int8() { int8_t v; read(&v, sizeof(int8_t)); return v; }
uint16_t read_uint16() { uint16_t v; read(&v, sizeof(uint16_t)); return v; }
int16_t read_int16() { int16_t v; read(&v, sizeof(int16_t)); return v; }
uint32_t read_uint32() { uint32_t v; read(&v, sizeof(uint32_t)); return v; }
int32_t read_int32() { int32_t v; read(&v, sizeof(int32_t)); return v; }
uint64_t read_uint64() { uint64_t v; read(&v, sizeof(uint64_t)); return v; }
int64_t read_int64() { int64_t v; read(&v, sizeof(int64_t)); return v; }
virtual ~File() = default;
virtual int64_t size() = 0;
virtual void read(void *data, size_t size) = 0;
virtual void write(const void *data, size_t size) = 0;
virtual void seek(int64_t offset, SeekPoint origin = SeekPoint::begin) = 0;
virtual uint64_t tell() = 0;
};
class Directory
{
public:
static std::vector<std::string> files(const std::string &filename);
static std::vector<std::string> folders(const std::string& filename);
static std::string exe_path();
static void create(const std::string& path);
};
class FilePath
{
public:
static bool has_extension(const std::string &filename, const char *extension);
static std::string extension(const std::string &filename);
static std::string remove_extension(const std::string &filename);
static std::string last_component(const std::string &path);
static std::string remove_last_component(const std::string &path);
static std::string combine(const std::string &path1, const std::string &path2);
static std::string force_filesys_slash(std::string path);
static std::string force_slash(std::string path);
static std::string force_backslash(std::string path);
};

54
src/framework/utf16.cpp Normal file
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#include "utf16.h"
#include <stdexcept>
#ifdef WIN32
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <Windows.h>
#undef min
#undef max
std::wstring to_utf16(const std::string& str)
{
if (str.empty()) return {};
int needed = MultiByteToWideChar(CP_UTF8, 0, str.data(), (int)str.size(), nullptr, 0);
if (needed == 0)
throw std::runtime_error("MultiByteToWideChar failed");
std::wstring result;
result.resize(needed);
needed = MultiByteToWideChar(CP_UTF8, 0, str.data(), (int)str.size(), &result[0], (int)result.size());
if (needed == 0)
throw std::runtime_error("MultiByteToWideChar failed");
return result;
}
std::string from_utf16(const std::wstring& str)
{
if (str.empty()) return {};
int needed = WideCharToMultiByte(CP_UTF8, 0, str.data(), (int)str.size(), nullptr, 0, nullptr, nullptr);
if (needed == 0)
throw std::runtime_error("WideCharToMultiByte failed");
std::string result;
result.resize(needed);
needed = WideCharToMultiByte(CP_UTF8, 0, str.data(), (int)str.size(), &result[0], (int)result.size(), nullptr, nullptr);
if (needed == 0)
throw std::runtime_error("WideCharToMultiByte failed");
return result;
}
#else
std::wstring to_utf16(const std::string& str)
{
throw std::runtime_error("to_utf16 not implemented on this platform");
}
std::string from_utf16(const std::wstring& str)
{
throw std::runtime_error("from_utf16 not implemented on this platform");
}
#endif

6
src/framework/utf16.h Normal file
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#pragma once
#include <string>
std::wstring to_utf16(const std::string& str);
std::string from_utf16(const std::wstring& str);

112
src/framework/zipreader.cpp Normal file
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#include "zipreader.h"
#include "file.h"
#include <miniz/miniz.h>
#include <stdexcept>
class ZipReaderImpl : public ZipReader
{
public:
ZipReaderImpl(std::string filename)
{
file = File::open_existing(std::move(filename));
zip.m_pIO_opaque = this;
zip.m_pRead = &ZipReaderImpl::read;
mz_bool result = mz_zip_reader_init(&zip, file->size(), 0);
if (result == MZ_FALSE)
throw std::runtime_error("mz_zip_reader_init failed");
}
~ZipReaderImpl()
{
mz_zip_reader_end(&zip);
}
bool file_exists(const std::string& filename) override
{
mz_uint32 fileIndex;
mz_bool result = mz_zip_reader_locate_file_v2(&zip, filename.c_str(), nullptr, 0, &fileIndex);
return result;
}
uint32_t get_crc32(const std::string& filename) override
{
int file_index = mz_zip_reader_locate_file(&zip, filename.c_str(), nullptr, 0);
if (file_index == -1)
throw std::runtime_error("File " + filename + " not found in archive");
mz_zip_archive_file_stat stat;
mz_bool result = mz_zip_reader_file_stat(&zip, file_index, &stat);
if (result == MZ_FALSE)
throw std::runtime_error("mz_zip_reader_file_stat failed");
return stat.m_crc32;
}
std::vector<uint8_t> read_all_bytes(const std::string& filename) override
{
int file_index = mz_zip_reader_locate_file(&zip, filename.c_str(), nullptr, 0);
if (file_index == -1)
throw std::runtime_error("File " + filename + " not found in archive");
mz_zip_archive_file_stat stat;
mz_bool result = mz_zip_reader_file_stat(&zip, file_index, &stat);
if (result == MZ_FALSE)
throw std::runtime_error("mz_zip_reader_file_stat failed");
std::vector<uint8_t> buffer(stat.m_uncomp_size);
if (!buffer.empty())
{
mz_bool result = mz_zip_reader_extract_to_mem(&zip, file_index, buffer.data(), buffer.size(), 0);
if (result == MZ_FALSE)
throw std::runtime_error("mz_zip_reader_extract_file_to_mem failed");
}
return buffer;
}
std::string read_all_text(const std::string& filename) override
{
int file_index = mz_zip_reader_locate_file(&zip, filename.c_str(), nullptr, 0);
if (file_index == -1)
throw std::runtime_error("File " + filename + " not found in archive");
mz_zip_archive_file_stat stat;
mz_bool result = mz_zip_reader_file_stat(&zip, file_index, &stat);
if (result == MZ_FALSE)
throw std::runtime_error("mz_zip_reader_file_stat failed");
std::string buffer;
buffer.resize(stat.m_uncomp_size);
if (!buffer.empty())
{
mz_bool result = mz_zip_reader_extract_to_mem(&zip, file_index, &buffer[0], buffer.size(), 0);
if (result == MZ_FALSE)
throw std::runtime_error("mz_zip_reader_extract_file_to_mem failed");
}
return buffer;
}
static size_t read(void* pOpaque, mz_uint64 file_ofs, void* pBuf, size_t n)
{
ZipReaderImpl* impl = static_cast<ZipReaderImpl*>(pOpaque);
if (file_ofs != impl->offset)
{
impl->file->seek(file_ofs);
impl->offset = file_ofs;
}
impl->file->read(pBuf, n);
impl->offset += n;
return n;
}
std::shared_ptr<File> file;
mz_uint64 offset = 0;
mz_zip_archive zip = {};
};
std::unique_ptr<ZipReader> ZipReader::open(std::string filename)
{
return std::make_unique<ZipReaderImpl>(std::move(filename));
}

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#pragma once
#include <memory>
#include <string>
#include <vector>
#include <cstdint>
class ZipReader
{
public:
static std::unique_ptr<ZipReader> open(std::string filename);
virtual ~ZipReader() = default;
virtual bool file_exists(const std::string& filename) = 0;
virtual uint32_t get_crc32(const std::string& filename) = 0;
virtual std::vector<uint8_t> read_all_bytes(const std::string& filename) = 0;
virtual std::string read_all_text(const std::string& filename) = 0;
};

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// picoPNG version 20101224
// Copyright (c) 2005-2010 Lode Vandevenne
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source distribution.

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#include <vector>
#include <cstddef>
#include <cstdint>
/*
decodePNG: The picoPNG function, decodes a PNG file buffer in memory, into a raw pixel buffer.
out_image: output parameter, this will contain the raw pixels after decoding.
By default the output is 32-bit RGBA color.
The std::vector is automatically resized to the correct size.
image_width: output_parameter, this will contain the width of the image in pixels.
image_height: output_parameter, this will contain the height of the image in pixels.
in_png: pointer to the buffer of the PNG file in memory. To get it from a file on
disk, load it and store it in a memory buffer yourself first.
in_size: size of the input PNG file in bytes.
convert_to_rgba32: optional parameter, true by default.
Set to true to get the output in RGBA 32-bit (8 bit per channel) color format
no matter what color type the original PNG image had. This gives predictable,
useable data from any random input PNG.
Set to false to do no color conversion at all. The result then has the same data
type as the PNG image, which can range from 1 bit to 64 bits per pixel.
Information about the color type or palette colors are not provided. You need
to know this information yourself to be able to use the data so this only
works for trusted PNG files. Use LodePNG instead of picoPNG if you need this information.
return: 0 if success, not 0 if some error occured.
*/
int decodePNG(std::vector<unsigned char>& out_image, unsigned long& image_width, unsigned long& image_height, const unsigned char* in_png, size_t in_size, bool convert_to_rgba32 = true)
{
// picoPNG version 20101224
// Copyright (c) 2005-2010 Lode Vandevenne
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source distribution.
// picoPNG is a PNG decoder in one C++ function of around 500 lines. Use picoPNG for
// programs that need only 1 .cpp file. Since it's a single function, it's very limited,
// it can convert a PNG to raw pixel data either converted to 32-bit RGBA color or
// with no color conversion at all. For anything more complex, another tiny library
// is available: LodePNG (lodepng.c(pp)), which is a single source and header file.
// Apologies for the compact code style, it's to make this tiny.
static const unsigned long LENBASE[29] = {3,4,5,6,7,8,9,10,11,13,15,17,19,23,27,31,35,43,51,59,67,83,99,115,131,163,195,227,258};
static const unsigned long LENEXTRA[29] = {0,0,0,0,0,0,0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0};
static const unsigned long DISTBASE[30] = {1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577};
static const unsigned long DISTEXTRA[30] = {0,0,0,0,1,1,2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13};
static const unsigned long CLCL[19] = {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15}; //code length code lengths
struct Zlib //nested functions for zlib decompression
{
static unsigned long readBitFromStream(size_t& bitp, const unsigned char* bits) { unsigned long result = (bits[bitp >> 3] >> (bitp & 0x7)) & 1; bitp++; return result;}
static unsigned long readBitsFromStream(size_t& bitp, const unsigned char* bits, size_t nbits)
{
unsigned long result = 0;
for(size_t i = 0; i < nbits; i++) result += (readBitFromStream(bitp, bits)) << i;
return result;
}
struct HuffmanTree
{
int makeFromLengths(const std::vector<unsigned long>& bitlen, unsigned long maxbitlen)
{ //make tree given the lengths
unsigned long numcodes = (unsigned long)(bitlen.size()), treepos = 0, nodefilled = 0;
std::vector<unsigned long> tree1d(numcodes), blcount(maxbitlen + 1, 0), nextcode(maxbitlen + 1, 0);
for(unsigned long bits = 0; bits < numcodes; bits++) blcount[bitlen[bits]]++; //count number of instances of each code length
for(unsigned long bits = 1; bits <= maxbitlen; bits++) nextcode[bits] = (nextcode[bits - 1] + blcount[bits - 1]) << 1;
for(unsigned long n = 0; n < numcodes; n++) if(bitlen[n] != 0) tree1d[n] = nextcode[bitlen[n]]++; //generate all the codes
tree2d.clear(); tree2d.resize(numcodes * 2, 32767); //32767 here means the tree2d isn't filled there yet
for(unsigned long n = 0; n < numcodes; n++) //the codes
for(unsigned long i = 0; i < bitlen[n]; i++) //the bits for this code
{
unsigned long bit = (tree1d[n] >> (bitlen[n] - i - 1)) & 1;
if(treepos > numcodes - 2) return 55;
if(tree2d[2 * treepos + bit] == 32767) //not yet filled in
{
if(i + 1 == bitlen[n]) { tree2d[2 * treepos + bit] = n; treepos = 0; } //last bit
else { tree2d[2 * treepos + bit] = ++nodefilled + numcodes; treepos = nodefilled; } //addresses are encoded as values > numcodes
}
else treepos = tree2d[2 * treepos + bit] - numcodes; //subtract numcodes from address to get address value
}
return 0;
}
int decode(bool& decoded, unsigned long& result, size_t& treepos, unsigned long bit) const
{ //Decodes a symbol from the tree
unsigned long numcodes = (unsigned long)tree2d.size() / 2;
if(treepos >= numcodes) return 11; //error: you appeared outside the codetree
result = tree2d[2 * treepos + bit];
decoded = (result < numcodes);
treepos = decoded ? 0 : result - numcodes;
return 0;
}
std::vector<unsigned long> tree2d; //2D representation of a huffman tree: The one dimension is "0" or "1", the other contains all nodes and leaves of the tree.
};
struct Inflator
{
int error;
void inflate(std::vector<unsigned char>& out, const std::vector<unsigned char>& in, size_t inpos = 0)
{
size_t bp = 0, pos = 0; //bit pointer and byte pointer
error = 0;
unsigned long BFINAL = 0;
while(!BFINAL && !error)
{
if(bp >> 3 >= in.size()) { error = 52; return; } //error, bit pointer will jump past memory
BFINAL = readBitFromStream(bp, &in[inpos]);
unsigned long BTYPE = readBitFromStream(bp, &in[inpos]); BTYPE += 2 * readBitFromStream(bp, &in[inpos]);
if(BTYPE == 3) { error = 20; return; } //error: invalid BTYPE
else if(BTYPE == 0) inflateNoCompression(out, &in[inpos], bp, pos, in.size());
else inflateHuffmanBlock(out, &in[inpos], bp, pos, in.size(), BTYPE);
}
if(!error) out.resize(pos); //Only now we know the true size of out, resize it to that
}
void generateFixedTrees(HuffmanTree& tree, HuffmanTree& treeD) //get the tree of a deflated block with fixed tree
{
std::vector<unsigned long> bitlen(288, 8), bitlenD(32, 5);;
for(size_t i = 144; i <= 255; i++) bitlen[i] = 9;
for(size_t i = 256; i <= 279; i++) bitlen[i] = 7;
tree.makeFromLengths(bitlen, 15);
treeD.makeFromLengths(bitlenD, 15);
}
HuffmanTree codetree, codetreeD, codelengthcodetree; //the code tree for Huffman codes, dist codes, and code length codes
unsigned long huffmanDecodeSymbol(const unsigned char* in, size_t& bp, const HuffmanTree& codetree, size_t inlength)
{ //decode a single symbol from given list of bits with given code tree. return value is the symbol
bool decoded; unsigned long ct;
for(size_t treepos = 0;;)
{
if((bp & 0x07) == 0 && (bp >> 3) > inlength) { error = 10; return 0; } //error: end reached without endcode
error = codetree.decode(decoded, ct, treepos, readBitFromStream(bp, in)); if(error) return 0; //stop, an error happened
if(decoded) return ct;
}
}
void getTreeInflateDynamic(HuffmanTree& tree, HuffmanTree& treeD, const unsigned char* in, size_t& bp, size_t inlength)
{ //get the tree of a deflated block with dynamic tree, the tree itself is also Huffman compressed with a known tree
std::vector<unsigned long> bitlen(288, 0), bitlenD(32, 0);
if(bp >> 3 >= inlength - 2) { error = 49; return; } //the bit pointer is or will go past the memory
size_t HLIT = readBitsFromStream(bp, in, 5) + 257; //number of literal/length codes + 257
size_t HDIST = readBitsFromStream(bp, in, 5) + 1; //number of dist codes + 1
size_t HCLEN = readBitsFromStream(bp, in, 4) + 4; //number of code length codes + 4
std::vector<unsigned long> codelengthcode(19); //lengths of tree to decode the lengths of the dynamic tree
for(size_t i = 0; i < 19; i++) codelengthcode[CLCL[i]] = (i < HCLEN) ? readBitsFromStream(bp, in, 3) : 0;
error = codelengthcodetree.makeFromLengths(codelengthcode, 7); if(error) return;
size_t i = 0, replength;
while(i < HLIT + HDIST)
{
unsigned long code = huffmanDecodeSymbol(in, bp, codelengthcodetree, inlength); if(error) return;
if(code <= 15) { if(i < HLIT) bitlen[i++] = code; else bitlenD[i++ - HLIT] = code; } //a length code
else if(code == 16) //repeat previous
{
if(bp >> 3 >= inlength) { error = 50; return; } //error, bit pointer jumps past memory
replength = 3 + readBitsFromStream(bp, in, 2);
unsigned long value; //set value to the previous code
if((i - 1) < HLIT) value = bitlen[i - 1];
else value = bitlenD[i - HLIT - 1];
for(size_t n = 0; n < replength; n++) //repeat this value in the next lengths
{
if(i >= HLIT + HDIST) { error = 13; return; } //error: i is larger than the amount of codes
if(i < HLIT) bitlen[i++] = value; else bitlenD[i++ - HLIT] = value;
}
}
else if(code == 17) //repeat "0" 3-10 times
{
if(bp >> 3 >= inlength) { error = 50; return; } //error, bit pointer jumps past memory
replength = 3 + readBitsFromStream(bp, in, 3);
for(size_t n = 0; n < replength; n++) //repeat this value in the next lengths
{
if(i >= HLIT + HDIST) { error = 14; return; } //error: i is larger than the amount of codes
if(i < HLIT) bitlen[i++] = 0; else bitlenD[i++ - HLIT] = 0;
}
}
else if(code == 18) //repeat "0" 11-138 times
{
if(bp >> 3 >= inlength) { error = 50; return; } //error, bit pointer jumps past memory
replength = 11 + readBitsFromStream(bp, in, 7);
for(size_t n = 0; n < replength; n++) //repeat this value in the next lengths
{
if(i >= HLIT + HDIST) { error = 15; return; } //error: i is larger than the amount of codes
if(i < HLIT) bitlen[i++] = 0; else bitlenD[i++ - HLIT] = 0;
}
}
else { error = 16; return; } //error: somehow an unexisting code appeared. This can never happen.
}
if(bitlen[256] == 0) { error = 64; return; } //the length of the end code 256 must be larger than 0
error = tree.makeFromLengths(bitlen, 15); if(error) return; //now we've finally got HLIT and HDIST, so generate the code trees, and the function is done
error = treeD.makeFromLengths(bitlenD, 15); if(error) return;
}
void inflateHuffmanBlock(std::vector<unsigned char>& out, const unsigned char* in, size_t& bp, size_t& pos, size_t inlength, unsigned long btype)
{
if(btype == 1) { generateFixedTrees(codetree, codetreeD); }
else if(btype == 2) { getTreeInflateDynamic(codetree, codetreeD, in, bp, inlength); if(error) return; }
for(;;)
{
unsigned long code = huffmanDecodeSymbol(in, bp, codetree, inlength); if(error) return;
if(code == 256) return; //end code
else if(code <= 255) //literal symbol
{
if(pos >= out.size()) out.resize((pos + 1) * 2); //reserve more room
out[pos++] = (unsigned char)(code);
}
else if(code >= 257 && code <= 285) //length code
{
size_t length = LENBASE[code - 257], numextrabits = LENEXTRA[code - 257];
if((bp >> 3) >= inlength) { error = 51; return; } //error, bit pointer will jump past memory
length += readBitsFromStream(bp, in, numextrabits);
unsigned long codeD = huffmanDecodeSymbol(in, bp, codetreeD, inlength); if(error) return;
if(codeD > 29) { error = 18; return; } //error: invalid dist code (30-31 are never used)
unsigned long dist = DISTBASE[codeD], numextrabitsD = DISTEXTRA[codeD];
if((bp >> 3) >= inlength) { error = 51; return; } //error, bit pointer will jump past memory
dist += readBitsFromStream(bp, in, numextrabitsD);
size_t start = pos, back = start - dist; //backwards
if(pos + length >= out.size()) out.resize((pos + length) * 2); //reserve more room
for(size_t i = 0; i < length; i++) { out[pos++] = out[back++]; if(back >= start) back = start - dist; }
}
}
}
void inflateNoCompression(std::vector<unsigned char>& out, const unsigned char* in, size_t& bp, size_t& pos, size_t inlength)
{
while((bp & 0x7) != 0) bp++; //go to first boundary of byte
size_t p = bp / 8;
if(p >= inlength - 4) { error = 52; return; } //error, bit pointer will jump past memory
unsigned long LEN = in[p] + 256 * in[p + 1], NLEN = in[p + 2] + 256 * in[p + 3]; p += 4;
if(LEN + NLEN != 65535) { error = 21; return; } //error: NLEN is not one's complement of LEN
if(pos + LEN >= out.size()) out.resize(pos + LEN);
if(p + LEN > inlength) { error = 23; return; } //error: reading outside of in buffer
for(unsigned long n = 0; n < LEN; n++) out[pos++] = in[p++]; //read LEN bytes of literal data
bp = p * 8;
}
};
int decompress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in) //returns error value
{
Inflator inflator;
if(in.size() < 2) { return 53; } //error, size of zlib data too small
if((in[0] * 256 + in[1]) % 31 != 0) { return 24; } //error: 256 * in[0] + in[1] must be a multiple of 31, the FCHECK value is supposed to be made that way
unsigned long CM = in[0] & 15, CINFO = (in[0] >> 4) & 15, FDICT = (in[1] >> 5) & 1;
if(CM != 8 || CINFO > 7) { return 25; } //error: only compression method 8: inflate with sliding window of 32k is supported by the PNG spec
if(FDICT != 0) { return 26; } //error: the specification of PNG says about the zlib stream: "The additional flags shall not specify a preset dictionary."
inflator.inflate(out, in, 2);
return inflator.error; //note: adler32 checksum was skipped and ignored
}
};
struct PNG //nested functions for PNG decoding
{
struct Info
{
unsigned long width, height, colorType, bitDepth, compressionMethod, filterMethod, interlaceMethod, key_r, key_g, key_b;
bool key_defined; //is a transparent color key given?
std::vector<unsigned char> palette;
} info;
int error;
void decode(std::vector<unsigned char>& out, const unsigned char* in, size_t size, bool convert_to_rgba32)
{
error = 0;
if(size == 0 || in == 0) { error = 48; return; } //the given data is empty
readPngHeader(&in[0], size); if(error) return;
size_t pos = 33; //first byte of the first chunk after the header
std::vector<unsigned char> idat; //the data from idat chunks
bool IEND = false, known_type = true;
info.key_defined = false;
while(!IEND) //loop through the chunks, ignoring unknown chunks and stopping at IEND chunk. IDAT data is put at the start of the in buffer
{
if(pos + 8 >= size) { error = 30; return; } //error: size of the in buffer too small to contain next chunk
size_t chunkLength = read32bitInt(&in[pos]); pos += 4;
if(chunkLength > 2147483647) { error = 63; return; }
if(pos + chunkLength >= size) { error = 35; return; } //error: size of the in buffer too small to contain next chunk
if(in[pos + 0] == 'I' && in[pos + 1] == 'D' && in[pos + 2] == 'A' && in[pos + 3] == 'T') //IDAT chunk, containing compressed image data
{
idat.insert(idat.end(), &in[pos + 4], &in[pos + 4 + chunkLength]);
pos += (4 + chunkLength);
}
else if(in[pos + 0] == 'I' && in[pos + 1] == 'E' && in[pos + 2] == 'N' && in[pos + 3] == 'D') { pos += 4; IEND = true; }
else if(in[pos + 0] == 'P' && in[pos + 1] == 'L' && in[pos + 2] == 'T' && in[pos + 3] == 'E') //palette chunk (PLTE)
{
pos += 4; //go after the 4 letters
info.palette.resize(4 * (chunkLength / 3));
if(info.palette.size() > (4 * 256)) { error = 38; return; } //error: palette too big
for(size_t i = 0; i < info.palette.size(); i += 4)
{
for(size_t j = 0; j < 3; j++) info.palette[i + j] = in[pos++]; //RGB
info.palette[i + 3] = 255; //alpha
}
}
else if(in[pos + 0] == 't' && in[pos + 1] == 'R' && in[pos + 2] == 'N' && in[pos + 3] == 'S') //palette transparency chunk (tRNS)
{
pos += 4; //go after the 4 letters
if(info.colorType == 3)
{
if(4 * chunkLength > info.palette.size()) { error = 39; return; } //error: more alpha values given than there are palette entries
for(size_t i = 0; i < chunkLength; i++) info.palette[4 * i + 3] = in[pos++];
}
else if(info.colorType == 0)
{
if(chunkLength != 2) { error = 40; return; } //error: this chunk must be 2 bytes for greyscale image
info.key_defined = 1; info.key_r = info.key_g = info.key_b = 256 * in[pos] + in[pos + 1]; pos += 2;
}
else if(info.colorType == 2)
{
if(chunkLength != 6) { error = 41; return; } //error: this chunk must be 6 bytes for RGB image
info.key_defined = 1;
info.key_r = 256 * in[pos] + in[pos + 1]; pos += 2;
info.key_g = 256 * in[pos] + in[pos + 1]; pos += 2;
info.key_b = 256 * in[pos] + in[pos + 1]; pos += 2;
}
else { error = 42; return; } //error: tRNS chunk not allowed for other color models
}
else //it's not an implemented chunk type, so ignore it: skip over the data
{
if(!(in[pos + 0] & 32)) { error = 69; return; } //error: unknown critical chunk (5th bit of first byte of chunk type is 0)
pos += (chunkLength + 4); //skip 4 letters and uninterpreted data of unimplemented chunk
known_type = false;
}
pos += 4; //step over CRC (which is ignored)
}
unsigned long bpp = getBpp(info);
std::vector<unsigned char> scanlines(((info.width * (info.height * bpp + 7)) / 8) + info.height); //now the out buffer will be filled
Zlib zlib; //decompress with the Zlib decompressor
error = zlib.decompress(scanlines, idat); if(error) return; //stop if the zlib decompressor returned an error
size_t bytewidth = (bpp + 7) / 8, outlength = (info.height * info.width * bpp + 7) / 8;
out.resize(outlength); //time to fill the out buffer
unsigned char* out_ = outlength ? &out[0] : 0; //use a regular pointer to the std::vector for faster code if compiled without optimization
if(info.interlaceMethod == 0) //no interlace, just filter
{
size_t linestart = 0, linelength = (info.width * bpp + 7) / 8; //length in bytes of a scanline, excluding the filtertype byte
if(bpp >= 8) //byte per byte
for(unsigned long y = 0; y < info.height; y++)
{
unsigned long filterType = scanlines[linestart];
const unsigned char* prevline = (y == 0) ? 0 : &out_[(y - 1) * info.width * bytewidth];
unFilterScanline(&out_[linestart - y], &scanlines[linestart + 1], prevline, bytewidth, filterType, linelength); if(error) return;
linestart += (1 + linelength); //go to start of next scanline
}
else //less than 8 bits per pixel, so fill it up bit per bit
{
std::vector<unsigned char> templine((info.width * bpp + 7) >> 3); //only used if bpp < 8
for(size_t y = 0, obp = 0; y < info.height; y++)
{
unsigned long filterType = scanlines[linestart];
const unsigned char* prevline = (y == 0) ? 0 : &out_[(y - 1) * info.width * bytewidth];
unFilterScanline(&templine[0], &scanlines[linestart + 1], prevline, bytewidth, filterType, linelength); if(error) return;
for(size_t bp = 0; bp < info.width * bpp;) setBitOfReversedStream(obp, out_, readBitFromReversedStream(bp, &templine[0]));
linestart += (1 + linelength); //go to start of next scanline
}
}
}
else //interlaceMethod is 1 (Adam7)
{
size_t passw[7] = { (info.width + 7) / 8, (info.width + 3) / 8, (info.width + 3) / 4, (info.width + 1) / 4, (info.width + 1) / 2, (info.width + 0) / 2, (info.width + 0) / 1 };
size_t passh[7] = { (info.height + 7) / 8, (info.height + 7) / 8, (info.height + 3) / 8, (info.height + 3) / 4, (info.height + 1) / 4, (info.height + 1) / 2, (info.height + 0) / 2 };
size_t passstart[7] = {0};
size_t pattern[28] = {0,4,0,2,0,1,0,0,0,4,0,2,0,1,8,8,4,4,2,2,1,8,8,8,4,4,2,2}; //values for the adam7 passes
for(int i = 0; i < 6; i++) passstart[i + 1] = passstart[i] + passh[i] * ((passw[i] ? 1 : 0) + (passw[i] * bpp + 7) / 8);
std::vector<unsigned char> scanlineo((info.width * bpp + 7) / 8), scanlinen((info.width * bpp + 7) / 8); //"old" and "new" scanline
for(int i = 0; i < 7; i++)
adam7Pass(&out_[0], &scanlinen[0], &scanlineo[0], &scanlines[passstart[i]], info.width, pattern[i], pattern[i + 7], pattern[i + 14], pattern[i + 21], passw[i], passh[i], bpp);
}
if(convert_to_rgba32 && (info.colorType != 6 || info.bitDepth != 8)) //conversion needed
{
std::vector<unsigned char> data = out;
error = convert(out, &data[0], info, info.width, info.height);
}
}
void readPngHeader(const unsigned char* in, size_t inlength) //read the information from the header and store it in the Info
{
if(inlength < 29) { error = 27; return; } //error: the data length is smaller than the length of the header
if(in[0] != 137 || in[1] != 80 || in[2] != 78 || in[3] != 71 || in[4] != 13 || in[5] != 10 || in[6] != 26 || in[7] != 10) { error = 28; return; } //no PNG signature
if(in[12] != 'I' || in[13] != 'H' || in[14] != 'D' || in[15] != 'R') { error = 29; return; } //error: it doesn't start with a IHDR chunk!
info.width = read32bitInt(&in[16]); info.height = read32bitInt(&in[20]);
info.bitDepth = in[24]; info.colorType = in[25];
info.compressionMethod = in[26]; if(in[26] != 0) { error = 32; return; } //error: only compression method 0 is allowed in the specification
info.filterMethod = in[27]; if(in[27] != 0) { error = 33; return; } //error: only filter method 0 is allowed in the specification
info.interlaceMethod = in[28]; if(in[28] > 1) { error = 34; return; } //error: only interlace methods 0 and 1 exist in the specification
error = checkColorValidity(info.colorType, info.bitDepth);
}
void unFilterScanline(unsigned char* recon, const unsigned char* scanline, const unsigned char* precon, size_t bytewidth, unsigned long filterType, size_t length)
{
switch(filterType)
{
case 0: for(size_t i = 0; i < length; i++) recon[i] = scanline[i]; break;
case 1:
for(size_t i = 0; i < bytewidth; i++) recon[i] = scanline[i];
for(size_t i = bytewidth; i < length; i++) recon[i] = scanline[i] + recon[i - bytewidth];
break;
case 2:
if(precon) for(size_t i = 0; i < length; i++) recon[i] = scanline[i] + precon[i];
else for(size_t i = 0; i < length; i++) recon[i] = scanline[i];
break;
case 3:
if(precon)
{
for(size_t i = 0; i < bytewidth; i++) recon[i] = scanline[i] + precon[i] / 2;
for(size_t i = bytewidth; i < length; i++) recon[i] = scanline[i] + ((recon[i - bytewidth] + precon[i]) / 2);
}
else
{
for(size_t i = 0; i < bytewidth; i++) recon[i] = scanline[i];
for(size_t i = bytewidth; i < length; i++) recon[i] = scanline[i] + recon[i - bytewidth] / 2;
}
break;
case 4:
if(precon)
{
for(size_t i = 0; i < bytewidth; i++) recon[i] = scanline[i] + paethPredictor(0, precon[i], 0);
for(size_t i = bytewidth; i < length; i++) recon[i] = scanline[i] + paethPredictor(recon[i - bytewidth], precon[i], precon[i - bytewidth]);
}
else
{
for(size_t i = 0; i < bytewidth; i++) recon[i] = scanline[i];
for(size_t i = bytewidth; i < length; i++) recon[i] = scanline[i] + paethPredictor(recon[i - bytewidth], 0, 0);
}
break;
default: error = 36; return; //error: unexisting filter type given
}
}
void adam7Pass(unsigned char* out, unsigned char* linen, unsigned char* lineo, const unsigned char* in, unsigned long w, size_t passleft, size_t passtop, size_t spacex, size_t spacey, size_t passw, size_t passh, unsigned long bpp)
{ //filter and reposition the pixels into the output when the image is Adam7 interlaced. This function can only do it after the full image is already decoded. The out buffer must have the correct allocated memory size already.
if(passw == 0) return;
size_t bytewidth = (bpp + 7) / 8, linelength = 1 + ((bpp * passw + 7) / 8);
for(unsigned long y = 0; y < passh; y++)
{
unsigned char filterType = in[y * linelength], *prevline = (y == 0) ? 0 : lineo;
unFilterScanline(linen, &in[y * linelength + 1], prevline, bytewidth, filterType, (w * bpp + 7) / 8); if(error) return;
if(bpp >= 8) for(size_t i = 0; i < passw; i++) for(size_t b = 0; b < bytewidth; b++) //b = current byte of this pixel
out[bytewidth * w * (passtop + spacey * y) + bytewidth * (passleft + spacex * i) + b] = linen[bytewidth * i + b];
else for(size_t i = 0; i < passw; i++)
{
size_t obp = bpp * w * (passtop + spacey * y) + bpp * (passleft + spacex * i), bp = i * bpp;
for(size_t b = 0; b < bpp; b++) setBitOfReversedStream(obp, out, readBitFromReversedStream(bp, &linen[0]));
}
unsigned char* temp = linen; linen = lineo; lineo = temp; //swap the two buffer pointers "line old" and "line new"
}
}
static unsigned long readBitFromReversedStream(size_t& bitp, const unsigned char* bits) { unsigned long result = (bits[bitp >> 3] >> (7 - (bitp & 0x7))) & 1; bitp++; return result;}
static unsigned long readBitsFromReversedStream(size_t& bitp, const unsigned char* bits, unsigned long nbits)
{
unsigned long result = 0;
for(size_t i = nbits - 1; i < nbits; i--) result += ((readBitFromReversedStream(bitp, bits)) << i);
return result;
}
void setBitOfReversedStream(size_t& bitp, unsigned char* bits, unsigned long bit) { bits[bitp >> 3] |= (bit << (7 - (bitp & 0x7))); bitp++; }
unsigned long read32bitInt(const unsigned char* buffer) { return (buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3]; }
int checkColorValidity(unsigned long colorType, unsigned long bd) //return type is a LodePNG error code
{
if((colorType == 2 || colorType == 4 || colorType == 6)) { if(!(bd == 8 || bd == 16)) return 37; else return 0; }
else if(colorType == 0) { if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 || bd == 16)) return 37; else return 0; }
else if(colorType == 3) { if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 )) return 37; else return 0; }
else return 31; //unexisting color type
}
unsigned long getBpp(const Info& info)
{
if(info.colorType == 2) return (3 * info.bitDepth);
else if(info.colorType >= 4) return (info.colorType - 2) * info.bitDepth;
else return info.bitDepth;
}
int convert(std::vector<unsigned char>& out, const unsigned char* in, Info& infoIn, unsigned long w, unsigned long h)
{ //converts from any color type to 32-bit. return value = LodePNG error code
size_t numpixels = w * h, bp = 0;
out.resize(numpixels * 4);
unsigned char* out_ = out.empty() ? 0 : &out[0]; //faster if compiled without optimization
if(infoIn.bitDepth == 8 && infoIn.colorType == 0) //greyscale
for(size_t i = 0; i < numpixels; i++)
{
out_[4 * i + 0] = out_[4 * i + 1] = out_[4 * i + 2] = in[i];
out_[4 * i + 3] = (infoIn.key_defined && in[i] == infoIn.key_r) ? 0 : 255;
}
else if(infoIn.bitDepth == 8 && infoIn.colorType == 2) //RGB color
for(size_t i = 0; i < numpixels; i++)
{
for(size_t c = 0; c < 3; c++) out_[4 * i + c] = in[3 * i + c];
out_[4 * i + 3] = (infoIn.key_defined == 1 && in[3 * i + 0] == infoIn.key_r && in[3 * i + 1] == infoIn.key_g && in[3 * i + 2] == infoIn.key_b) ? 0 : 255;
}
else if(infoIn.bitDepth == 8 && infoIn.colorType == 3) //indexed color (palette)
for(size_t i = 0; i < numpixels; i++)
{
if(4U * in[i] >= infoIn.palette.size()) return 46;
for(size_t c = 0; c < 4; c++) out_[4 * i + c] = infoIn.palette[4 * in[i] + c]; //get rgb colors from the palette
}
else if(infoIn.bitDepth == 8 && infoIn.colorType == 4) //greyscale with alpha
for(size_t i = 0; i < numpixels; i++)
{
out_[4 * i + 0] = out_[4 * i + 1] = out_[4 * i + 2] = in[2 * i + 0];
out_[4 * i + 3] = in[2 * i + 1];
}
else if(infoIn.bitDepth == 8 && infoIn.colorType == 6) for(size_t i = 0; i < numpixels; i++) for(size_t c = 0; c < 4; c++) out_[4 * i + c] = in[4 * i + c]; //RGB with alpha
else if(infoIn.bitDepth == 16 && infoIn.colorType == 0) //greyscale
for(size_t i = 0; i < numpixels; i++)
{
out_[4 * i + 0] = out_[4 * i + 1] = out_[4 * i + 2] = in[2 * i];
out_[4 * i + 3] = (infoIn.key_defined && 256U * in[i] + in[i + 1] == infoIn.key_r) ? 0 : 255;
}
else if(infoIn.bitDepth == 16 && infoIn.colorType == 2) //RGB color
for(size_t i = 0; i < numpixels; i++)
{
for(size_t c = 0; c < 3; c++) out_[4 * i + c] = in[6 * i + 2 * c];
out_[4 * i + 3] = (infoIn.key_defined && 256U*in[6*i+0]+in[6*i+1] == infoIn.key_r && 256U*in[6*i+2]+in[6*i+3] == infoIn.key_g && 256U*in[6*i+4]+in[6*i+5] == infoIn.key_b) ? 0 : 255;
}
else if(infoIn.bitDepth == 16 && infoIn.colorType == 4) //greyscale with alpha
for(size_t i = 0; i < numpixels; i++)
{
out_[4 * i + 0] = out_[4 * i + 1] = out_[4 * i + 2] = in[4 * i]; //most significant byte
out_[4 * i + 3] = in[4 * i + 2];
}
else if(infoIn.bitDepth == 16 && infoIn.colorType == 6) for(size_t i = 0; i < numpixels; i++) for(size_t c = 0; c < 4; c++) out_[4 * i + c] = in[8 * i + 2 * c]; //RGB with alpha
else if(infoIn.bitDepth < 8 && infoIn.colorType == 0) //greyscale
for(size_t i = 0; i < numpixels; i++)
{
unsigned long value = (readBitsFromReversedStream(bp, in, infoIn.bitDepth) * 255) / ((1 << infoIn.bitDepth) - 1); //scale value from 0 to 255
out_[4 * i + 0] = out_[4 * i + 1] = out_[4 * i + 2] = (unsigned char)(value);
out_[4 * i + 3] = (infoIn.key_defined && value && ((1U << infoIn.bitDepth) - 1U) == infoIn.key_r && ((1U << infoIn.bitDepth) - 1U)) ? 0 : 255;
}
else if(infoIn.bitDepth < 8 && infoIn.colorType == 3) //palette
for(size_t i = 0; i < numpixels; i++)
{
unsigned long value = readBitsFromReversedStream(bp, in, infoIn.bitDepth);
if(4 * value >= infoIn.palette.size()) return 47;
for(size_t c = 0; c < 4; c++) out_[4 * i + c] = infoIn.palette[4 * value + c]; //get rgb colors from the palette
}
return 0;
}
unsigned char paethPredictor(short a, short b, short c) //Paeth predicter, used by PNG filter type 4
{
short p = a + b - c, pa = p > a ? (p - a) : (a - p), pb = p > b ? (p - b) : (b - p), pc = p > c ? (p - c) : (c - p);
return (unsigned char)((pa <= pb && pa <= pc) ? a : pb <= pc ? b : c);
}
};
PNG decoder; decoder.decode(out_image, in_png, in_size, convert_to_rgba32);
image_width = decoder.info.width; image_height = decoder.info.height;
return decoder.error;
}
#if 0
//an example using the PNG loading function:
#include <iostream>
#include <fstream>
void loadFile(std::vector<unsigned char>& buffer, const std::string& filename) //designed for loading files from hard disk in an std::vector
{
std::ifstream file(filename.c_str(), std::ios::in|std::ios::binary|std::ios::ate);
//get filesize
std::streamsize size = 0;
if(file.seekg(0, std::ios::end).good()) size = file.tellg();
if(file.seekg(0, std::ios::beg).good()) size -= file.tellg();
//read contents of the file into the vector
if(size > 0)
{
buffer.resize((size_t)size);
file.read((char*)(&buffer[0]), size);
}
else buffer.clear();
}
int main(int argc, char *argv[])
{
const char* filename = argc > 1 ? argv[1] : "test.png";
//load and decode
std::vector<unsigned char> buffer, image;
loadFile(buffer, filename);
unsigned long w, h;
int error = decodePNG(image, w, h, buffer.empty() ? 0 : &buffer[0], (unsigned long)buffer.size());
//if there's an error, display it
if(error != 0) std::cout << "error: " << error << std::endl;
//the pixels are now in the vector "image", use it as texture, draw it, ...
if(image.size() > 4) std::cout << "width: " << w << " height: " << h << " first pixel: " << std::hex << int(image[0]) << int(image[1]) << int(image[2]) << int(image[3]) << std::endl;
}
/*
//this is test code, it displays the pixels of a 1 bit PNG. To use it, set the flag convert_to_rgba32 to false and load a 1-bit PNG image with a small size (so that its ASCII representation can fit in a console window)
for(int y = 0; y < h; y++)
{
for(int x = 0; x < w; x++)
{
int i = y * h + x;
std::cout << (((image[i/8] >> (7-i%8)) & 1) ? '.' : '#');
}
std::cout << std::endl;
}
*/
#endif

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#pragma once
#include <vector>
int decodePNG(std::vector<unsigned char>& out_image, unsigned long& image_width, unsigned long& image_height, const unsigned char* in_png, size_t in_size, bool convert_to_rgba32 = true);