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KytyPS5/src/libs/libPngDec.cpp
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nmzik 147188b143 Initial commit
2026-07-16 10:21:41 +02:00

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#include "common/abi.h"
#include "common/logging/log.h"
#include "libs/libs.h"
#include "loader/symbolDatabase.h"
#include "stb_image.h"
#include <algorithm>
#include <cstddef>
#include <cstring>
namespace Libs {
LIB_VERSION("PngDec", 1, "PngDec", 1, 1);
namespace PngDec {
constexpr int32_t PNG_DEC_ERROR_INVALID_ADDR = -2140602367; // 0x80690001
constexpr int32_t PNG_DEC_ERROR_INVALID_SIZE = -2140602366; // 0x80690002
constexpr int32_t PNG_DEC_ERROR_INVALID_PARAM = -2140602365; // 0x80690003
constexpr int32_t PNG_DEC_ERROR_INVALID_HANDLE = -2140602364; // 0x80690004
constexpr int32_t PNG_DEC_ERROR_INVALID_WORK_MEMORY = -2140602363; // 0x80690005
constexpr int32_t PNG_DEC_ERROR_INVALID_DATA = -2140602352; // 0x80690010
constexpr int32_t PNG_DEC_ERROR_DECODE_ERROR = -2140602350; // 0x80690012
constexpr uint32_t PNG_DEC_ATTRIBUTE_BIT_DEPTH_16 = 1;
constexpr uint16_t PNG_DEC_COLOR_SPACE_GRAYSCALE = 2;
constexpr uint16_t PNG_DEC_COLOR_SPACE_RGB = 3;
constexpr uint16_t PNG_DEC_COLOR_SPACE_CLUT = 4;
constexpr uint16_t PNG_DEC_COLOR_SPACE_GRAYSCALE_ALPHA = 18;
constexpr uint16_t PNG_DEC_COLOR_SPACE_RGBA = 19;
constexpr uint16_t PNG_DEC_PIXEL_FORMAT_R8G8B8A8 = 0;
constexpr uint16_t PNG_DEC_PIXEL_FORMAT_B8G8R8A8 = 1;
constexpr uint32_t PNG_DEC_IMAGE_FLAG_ADAM7_INTERLACE = 1;
constexpr uint32_t PNG_DEC_IMAGE_FLAG_TRNS_CHUNK_EXIST = 2;
struct PngDecCreateParam {
uint32_t this_size;
uint32_t attribute;
uint32_t max_image_width;
};
struct PngDecDecodeParam {
const void* png_mem_addr;
void* image_mem_addr;
uint32_t png_mem_size;
uint32_t image_mem_size;
uint16_t pixel_format;
uint16_t alpha_value;
uint32_t image_pitch;
};
struct PngDecParseParam {
const void* png_mem_addr;
uint32_t png_mem_size;
uint32_t reserved0;
};
struct PngDecImageInfo {
uint32_t image_width;
uint32_t image_height;
uint16_t color_space;
uint16_t bit_depth;
uint32_t image_flag;
};
struct PngDecContext {
uint64_t magic;
};
struct PngHeaderInfo {
uint32_t width;
uint32_t height;
uint16_t color_space;
uint16_t bit_depth;
uint32_t image_flag;
};
constexpr uint64_t PNG_DEC_CONTEXT_MAGIC = 0x4b595459504e4744ull; // KYTYPNGD
static uint32_t ReadBe32(const uint8_t* ptr) {
return (static_cast<uint32_t>(ptr[0]) << 24u) | (static_cast<uint32_t>(ptr[1]) << 16u) |
(static_cast<uint32_t>(ptr[2]) << 8u) | static_cast<uint32_t>(ptr[3]);
}
static bool AddOverflow(uint32_t a, uint32_t b, uint32_t* out) {
*out = a + b;
return *out < a;
}
static bool ParsePngHeader(const void* data, uint32_t size, PngHeaderInfo* info) {
if (data == nullptr || info == nullptr) {
return false;
}
const auto* bytes = static_cast<const uint8_t*>(data);
constexpr uint8_t png_signature[] = {0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a};
if (size < 33u || std::memcmp(bytes, png_signature, sizeof(png_signature)) != 0) {
return false;
}
if (ReadBe32(bytes + 8u) != 13u || std::memcmp(bytes + 12u, "IHDR", 4u) != 0) {
return false;
}
const auto color_type = bytes[25u];
switch (color_type) {
case 0: info->color_space = PNG_DEC_COLOR_SPACE_GRAYSCALE; break;
case 2: info->color_space = PNG_DEC_COLOR_SPACE_RGB; break;
case 3: info->color_space = PNG_DEC_COLOR_SPACE_CLUT; break;
case 4: info->color_space = PNG_DEC_COLOR_SPACE_GRAYSCALE_ALPHA; break;
case 6: info->color_space = PNG_DEC_COLOR_SPACE_RGBA; break;
default: return false;
}
info->width = ReadBe32(bytes + 16u);
info->height = ReadBe32(bytes + 20u);
info->bit_depth = bytes[24u];
info->image_flag = (bytes[28u] == 1u ? PNG_DEC_IMAGE_FLAG_ADAM7_INTERLACE : 0u);
if (info->width == 0 || info->height == 0) {
return false;
}
uint32_t offset = 33u;
while (offset + 12u <= size) {
const uint32_t length = ReadBe32(bytes + offset);
const auto* type = bytes + offset + 4u;
uint32_t chunk_end = 0;
if (AddOverflow(offset, 12u, &chunk_end) || AddOverflow(chunk_end, length, &chunk_end) ||
chunk_end > size) {
return false;
}
if (std::memcmp(type, "tRNS", 4u) == 0) {
info->image_flag |= PNG_DEC_IMAGE_FLAG_TRNS_CHUNK_EXIST;
}
if (std::memcmp(type, "IDAT", 4u) == 0 || std::memcmp(type, "IEND", 4u) == 0) {
break;
}
offset = chunk_end;
}
return true;
}
static void FillImageInfo(const PngHeaderInfo& header, PngDecImageInfo* image_info) {
if (image_info != nullptr) {
image_info->image_width = header.width;
image_info->image_height = header.height;
image_info->color_space = header.color_space;
image_info->bit_depth = header.bit_depth;
image_info->image_flag = header.image_flag;
}
}
static bool PngHasSourceAlpha(const PngHeaderInfo& header) {
return header.color_space == PNG_DEC_COLOR_SPACE_RGBA ||
header.color_space == PNG_DEC_COLOR_SPACE_GRAYSCALE_ALPHA ||
(header.image_flag & PNG_DEC_IMAGE_FLAG_TRNS_CHUNK_EXIST) != 0;
}
static int32_t KYTY_SYSV_ABI PngDecQueryMemorySize(const PngDecCreateParam* param) {
PRINT_NAME();
if (param == nullptr) {
return PNG_DEC_ERROR_INVALID_PARAM;
}
LOGF("\t this_size = %" PRIu32 "\n", param->this_size);
LOGF("\t attribute = %" PRIu32 "\n", param->attribute);
LOGF("\t max_image_width = %" PRIu32 "\n", param->max_image_width);
if (param->attribute > PNG_DEC_ATTRIBUTE_BIT_DEPTH_16) {
return PNG_DEC_ERROR_INVALID_PARAM;
}
if (param->max_image_width == 0) {
return PNG_DEC_ERROR_INVALID_SIZE;
}
return sizeof(PngDecContext);
}
static int32_t KYTY_SYSV_ABI PngDecCreate(const PngDecCreateParam* param, void* memory_address,
uint32_t memory_size, void** handle) {
PRINT_NAME();
if (param == nullptr || handle == nullptr) {
return PNG_DEC_ERROR_INVALID_PARAM;
}
LOGF("\t memory_address = %p\n", memory_address);
LOGF("\t memory_size = %" PRIu32 "\n", memory_size);
if (param->attribute > PNG_DEC_ATTRIBUTE_BIT_DEPTH_16) {
return PNG_DEC_ERROR_INVALID_PARAM;
}
if (param->max_image_width == 0) {
return PNG_DEC_ERROR_INVALID_SIZE;
}
if (memory_address == nullptr) {
return PNG_DEC_ERROR_INVALID_ADDR;
}
if (memory_size < sizeof(PngDecContext)) {
return PNG_DEC_ERROR_INVALID_WORK_MEMORY;
}
auto* ctx = static_cast<PngDecContext*>(memory_address);
ctx->magic = PNG_DEC_CONTEXT_MAGIC;
*handle = ctx;
return 0;
}
static int32_t KYTY_SYSV_ABI PngDecDecode(void* handle, const PngDecDecodeParam* param,
PngDecImageInfo* image_info) {
PRINT_NAME();
if (handle == nullptr) {
return PNG_DEC_ERROR_INVALID_HANDLE;
}
const auto* ctx = static_cast<const PngDecContext*>(handle);
if (ctx->magic != PNG_DEC_CONTEXT_MAGIC) {
return PNG_DEC_ERROR_INVALID_HANDLE;
}
if (param == nullptr) {
return PNG_DEC_ERROR_INVALID_PARAM;
}
if (param->png_mem_addr == nullptr || param->image_mem_addr == nullptr) {
return PNG_DEC_ERROR_INVALID_ADDR;
}
if (param->pixel_format != PNG_DEC_PIXEL_FORMAT_R8G8B8A8 &&
param->pixel_format != PNG_DEC_PIXEL_FORMAT_B8G8R8A8) {
return PNG_DEC_ERROR_INVALID_PARAM;
}
PngHeaderInfo header {};
if (!ParsePngHeader(param->png_mem_addr, param->png_mem_size, &header)) {
return PNG_DEC_ERROR_INVALID_DATA;
}
FillImageInfo(header, image_info);
const uint32_t min_pitch = header.width * 4u;
const uint32_t pitch = (param->image_pitch == 0 ? min_pitch : param->image_pitch);
const uint64_t min_size = static_cast<uint64_t>(pitch) * (header.height - 1u) + min_pitch;
if (pitch < min_pitch || min_size > param->image_mem_size) {
return PNG_DEC_ERROR_INVALID_SIZE;
}
LOGF("\t png_mem_addr = %p\n", param->png_mem_addr);
LOGF("\t image_mem_addr = %p\n", param->image_mem_addr);
LOGF("\t png_mem_size = %" PRIu32 "\n", param->png_mem_size);
LOGF("\t image_mem_size = %" PRIu32 "\n", param->image_mem_size);
LOGF("\t pixel_format = %" PRIu16 "\n", param->pixel_format);
LOGF("\t alpha_value = %" PRIu16 "\n", param->alpha_value);
LOGF("\t image_pitch = %" PRIu32 "\n", param->image_pitch);
int width = 0;
int height = 0;
int components = 0;
auto* rgba = stbi_load_from_memory(static_cast<const stbi_uc*>(param->png_mem_addr),
static_cast<int>(param->png_mem_size), &width, &height,
&components, 4);
if (rgba == nullptr || width <= 0 || height <= 0 ||
static_cast<uint32_t>(width) != header.width ||
static_cast<uint32_t>(height) != header.height) {
if (rgba != nullptr) {
stbi_image_free(rgba);
}
return PNG_DEC_ERROR_DECODE_ERROR;
}
const bool apply_alpha_value = !PngHasSourceAlpha(header);
auto* dst_row = static_cast<uint8_t*>(param->image_mem_addr);
for (uint32_t y = 0; y < header.height; y++) {
const auto* src = rgba + static_cast<size_t>(y) * min_pitch;
auto* dst = dst_row;
for (uint32_t x = 0; x < header.width; x++) {
dst[0] = src[0];
dst[1] = src[1];
dst[2] = src[2];
dst[3] = (apply_alpha_value
? static_cast<uint8_t>(std::min<uint16_t>(param->alpha_value, 255u))
: src[3]);
if (param->pixel_format == PNG_DEC_PIXEL_FORMAT_B8G8R8A8) {
std::swap(dst[0], dst[2]);
}
src += 4;
dst += 4;
}
dst_row += pitch;
}
stbi_image_free(rgba);
return (header.width > 32767u || header.height > 32767u
? 0
: static_cast<int32_t>((header.width << 16u) | header.height));
}
static int32_t KYTY_SYSV_ABI PngDecDelete(void* handle) {
PRINT_NAME();
if (handle == nullptr) {
return PNG_DEC_ERROR_INVALID_HANDLE;
}
auto* ctx = static_cast<PngDecContext*>(handle);
if (ctx->magic != PNG_DEC_CONTEXT_MAGIC) {
return PNG_DEC_ERROR_INVALID_HANDLE;
}
ctx->magic = 0;
return 0;
}
static int32_t KYTY_SYSV_ABI PngDecParseHeader(const PngDecParseParam* param,
PngDecImageInfo* image_info) {
PRINT_NAME();
if (param == nullptr || image_info == nullptr) {
return PNG_DEC_ERROR_INVALID_PARAM;
}
if (param->png_mem_addr == nullptr) {
return PNG_DEC_ERROR_INVALID_ADDR;
}
if (param->reserved0 != 0) {
return PNG_DEC_ERROR_INVALID_PARAM;
}
PngHeaderInfo header {};
if (!ParsePngHeader(param->png_mem_addr, param->png_mem_size, &header)) {
return PNG_DEC_ERROR_INVALID_DATA;
}
FillImageInfo(header, image_info);
LOGF("\t image_width = %" PRIu32 "\n", image_info->image_width);
LOGF("\t image_height = %" PRIu32 "\n", image_info->image_height);
LOGF("\t color_space = %" PRIu16 "\n", image_info->color_space);
LOGF("\t bit_depth = %" PRIu16 "\n", image_info->bit_depth);
LOGF("\t image_flag = 0x%08" PRIx32 "\n", image_info->image_flag);
return 0;
}
} // namespace PngDec
LIB_DEFINE(InitPngDec_1) {
PRINT_NAME_ENABLE(true);
LIB_FUNC("-6srIGbLTIU", PngDec::PngDecQueryMemorySize);
LIB_FUNC("m0uW+8pFyaw", PngDec::PngDecCreate);
LIB_FUNC("WC216DD3El4", PngDec::PngDecDecode);
LIB_FUNC("QbD+eENEwo8", PngDec::PngDecDelete);
LIB_FUNC("U6h4e5JRPaQ", PngDec::PngDecParseHeader);
}
} // namespace Libs
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