From c60366e9d7a094a6da930eab79fae6bf71414728 Mon Sep 17 00:00:00 2001 From: Kabir Kwatra Date: Thu, 25 Jun 2026 22:46:41 -0700 Subject: [PATCH 1/3] ARW: add Sony "ARW 6.0" lossy decoder (compression 32766; A7R VI, A7 V) Adds SonyArw6Decompressor implementing Sony's "ARW 6.0" reversible-5/3-wavelet lossy codec (TIFF Compression 32766), used by the A7R VI (ILCE-7RM6) and A7 V (ILCE-7M5) "Compressed" / "Compressed HQ" RAW modes. Also adds the ILCE-7RM6 camera entry, the compression-32766 dispatch, the active-area crop, a dimension ceiling bump for the 66.8 MP sensor (which also enables the A7R VI lossless tiled LJpeg path), and a fuzz target. (The ILCE-7M5 entry already exists.) Pipeline: container tiles -> per-row GCLI bitplane entropy decode -> inverse reversible 5/3 wavelet (LL0 + 3 detail levels) -> log->linear LUT -> per-line colour conversion -> YCC->RGGB mosaic compose. Coefficients are int16; tiles and their (up to four) components decode in parallel under OpenMP (a no-op without it). The per-tile sub-header marker carries a 1-byte format tag that varies by body ('0' on the A7R VI, 'A' on the A7 V), so only its fixed "000" suffix is matched; the black/white level domain (1024/32800) and the DefaultCrop-derived active area are codec-universal. The format was reverse-engineered clean-room by observing the decoder's input/output behaviour; the 4096-entry log->linear table was recovered as a black-box input->output sampling, not transcribed. The full pipeline is validated byte-exact (MAE 0) against the reference decoder output (Adobe DNG) on both bodies, full-frame and APS-C, in both lossy and HQ modes. Malformed input is rejected via ThrowRDE rather than crashing, hanging, or invoking undefined behaviour. AI-usage: produced with substantial AI assistance; the codec was reverse-engineered from and validated stage-by-stage against the reference output. --- data/cameras.xml | 17 +- fuzz/all-fuzzers.txt | 1 + fuzz/librawspeed/decompressors/CMakeLists.txt | 1 + .../decompressors/SonyArw6Decompressor.cpp | 62 + src/librawspeed/decoders/ArwDecoder.cpp | 71 +- src/librawspeed/decoders/ArwDecoder.h | 1 + src/librawspeed/decompressors/CMakeLists.txt | 3 + .../decompressors/SonyArw6Decompressor.cpp | 1366 +++++++++++++++++ .../decompressors/SonyArw6Decompressor.h | 51 + .../decompressors/SonyArw6LogToLinear.h | 409 +++++ 10 files changed, 1980 insertions(+), 2 deletions(-) create mode 100644 fuzz/librawspeed/decompressors/SonyArw6Decompressor.cpp create mode 100644 src/librawspeed/decompressors/SonyArw6Decompressor.cpp create mode 100644 src/librawspeed/decompressors/SonyArw6Decompressor.h create mode 100644 src/librawspeed/decompressors/SonyArw6LogToLinear.h diff --git a/data/cameras.xml b/data/cameras.xml index 64791f230..26d555dd2 100644 --- a/data/cameras.xml +++ b/data/cameras.xml @@ -13966,8 +13966,23 @@ - + Sony ILCE-7RM6 + + RED + GREEN + GREEN + BLUE + + + + + + 11765 -5595 -1192 + -3689 11507 2485 + 51 681 5731 + + Sony ILCE-7S diff --git a/fuzz/all-fuzzers.txt b/fuzz/all-fuzzers.txt index 172a49033..d264b2603 100644 --- a/fuzz/all-fuzzers.txt +++ b/fuzz/all-fuzzers.txt @@ -54,6 +54,7 @@ SamsungV1DecompressorFuzzer SamsungV2DecompressorFuzzer SonyArw1DecompressorFuzzer SonyArw2DecompressorFuzzer +SonyArw6DecompressorFuzzer TiffDecoderFuzzer-ArwDecoder TiffDecoderFuzzer-Cr2Decoder TiffDecoderFuzzer-DcrDecoder diff --git a/fuzz/librawspeed/decompressors/CMakeLists.txt b/fuzz/librawspeed/decompressors/CMakeLists.txt index d8b145699..10a40ff4b 100644 --- a/fuzz/librawspeed/decompressors/CMakeLists.txt +++ b/fuzz/librawspeed/decompressors/CMakeLists.txt @@ -31,6 +31,7 @@ set(DECOMPRESSORS "SamsungV2Decompressor" "SonyArw1Decompressor" "SonyArw2Decompressor" + "SonyArw6Decompressor" "UncompressedDecompressor" "VC5Decompressor" ) diff --git a/fuzz/librawspeed/decompressors/SonyArw6Decompressor.cpp b/fuzz/librawspeed/decompressors/SonyArw6Decompressor.cpp new file mode 100644 index 000000000..ed2089a3a --- /dev/null +++ b/fuzz/librawspeed/decompressors/SonyArw6Decompressor.cpp @@ -0,0 +1,62 @@ +/* + RawSpeed - RAW file decoder. + + Copyright (C) 2026 Kabir Kwatra + + This library 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 2 of the License, or (at your option) any later version. + + This library 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 this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA +*/ + +#include "decompressors/SonyArw6Decompressor.h" +#include "MemorySanitizer.h" +#include "common/RawImage.h" +#include "common/RawspeedException.h" +#include "fuzz/Common.h" +#include "io/Buffer.h" +#include "io/ByteStream.h" +#include "io/Endianness.h" +#include +#include +#include + +extern "C" int LLVMFuzzerTestOneInput(const uint8_t* Data, size_t Size); + +extern "C" int LLVMFuzzerTestOneInput(const uint8_t* Data, size_t Size) { + assert(Data); + + try { + const rawspeed::Buffer b( + Data, rawspeed::implicit_cast(Size)); + const rawspeed::DataBuffer db(b, rawspeed::Endianness::little); + rawspeed::ByteStream bs(db); + + rawspeed::RawImage mRaw(CreateRawImage(bs)); + + // The decoder feeds the active CFA dimensions; mirror that by reusing the + // image dimensions chosen above. The constructor validates type/dims. + rawspeed::SonyArw6Decompressor d(mRaw, bs.getStream(bs.getRemainSize()), + mRaw->dim.x, mRaw->dim.y); + + mRaw->createData(); + + d.decompress(); + + rawspeed::MSan::CheckMemIsInitialized( + mRaw->getByteDataAsUncroppedArray2DRef()); + } catch (const rawspeed::RawspeedException&) { // NOLINT(bugprone-empty-catch) + // Exceptions are good, crashes are bad. + } + + return 0; +} diff --git a/src/librawspeed/decoders/ArwDecoder.cpp b/src/librawspeed/decoders/ArwDecoder.cpp index a33b48444..892eb105c 100644 --- a/src/librawspeed/decoders/ArwDecoder.cpp +++ b/src/librawspeed/decoders/ArwDecoder.cpp @@ -34,6 +34,7 @@ #include "decompressors/LJpegDecoder.h" #include "decompressors/SonyArw1Decompressor.h" #include "decompressors/SonyArw2Decompressor.h" +#include "decompressors/SonyArw6Decompressor.h" #include "decompressors/UncompressedDecompressor.h" #include "io/Buffer.h" #include "io/ByteStream.h" @@ -182,6 +183,11 @@ RawImage ArwDecoder::decodeRawInternal() { return mRaw; } + if (32766 == compression) { + DecodeARW6(raw); + return mRaw; + } + if (32767 != compression) ThrowRDE("Unsupported compression %i", compression); @@ -316,7 +322,7 @@ void ArwDecoder::DecodeLJpeg(const TiffIFD* raw) { } if (width == 0 || height == 0 || width % 2 != 0 || height % 2 != 0 || - width > 9728 || height > 6656) + width > 10240 || height > 7168) ThrowRDE("Unexpected image dimensions found: (%u; %u)", width, height); mRaw->dim = iPoint2D(width, height); @@ -412,6 +418,69 @@ void ArwDecoder::DecodeLJpeg(const TiffIFD* raw) { mRaw->subFrame(crop); } +void ArwDecoder::DecodeARW6(const TiffIFD* raw) { + // Sony "Compressed RAW 2" / ARW 6.0 (TIFF compression 32766), lossy RAW. + uint32_t width = raw->getEntry(TiffTag::IMAGEWIDTH)->getU32(); + uint32_t height = raw->getEntry(TiffTag::IMAGELENGTH)->getU32(); + + // FF frames are 10016x6672, APS-C 6592x4372. Raise the dimension ceiling. + if (width == 0 || height == 0 || width % 2 != 0 || height % 2 != 0 || + width > 10240 || height > 7168) + ThrowRDE("Unexpected image dimensions found: (%u; %u)", width, height); + + const TiffEntry* offsets = raw->getEntry(TiffTag::STRIPOFFSETS); + const TiffEntry* counts = raw->getEntry(TiffTag::STRIPBYTECOUNTS); + if (offsets->count != 1) + ThrowRDE("Multiple Strips found: %u", offsets->count); + if (counts->count != offsets->count) + ThrowRDE("Byte count number does not match strip size: count:%u, strips:%u", + counts->count, offsets->count); + + uint32_t off = offsets->getU32(); + uint32_t c2 = counts->getU32(); + + if (!mFile.isValid(off)) + ThrowRDE("Data offset after EOF, file probably truncated"); + if (!mFile.isValid(off, c2)) + c2 = mFile.getSize() - off; + + mRaw->dim = iPoint2D(width, height); + mRaw->createData(); + + ByteStream input(DataBuffer(mFile.getSubView(off, c2), Endianness::little)); + + SonyArw6Decompressor d(mRaw, input, implicit_cast(width), + implicit_cast(height)); + d.decompress(); + + // The ARW6 output is already in the final 16-bit CFA domain; no SonyCurve is + // applied for this path. Its value domain is the native ~14-bit scale, so the + // levels from cameras.xml (black 512 / white 16383) and the + // SONYBLACKLEVEL/SONYWHITELEVEL EXIF tags (read by GetWB()) apply unchanged. + + // Crop to the active CFA. The decoded frame keeps the tiling overlap on its + // right edge, so the active area is narrower than the decoded width: it is + // the DefaultCrop region plus its symmetric border (DefaultCropOrigin px on + // each side), equal to the lossless path's SonyRawImageSize. Both tags are + // read from the file, so this holds for any frame size with no hard-coded + // dimensions or full-frame/APS-C special-casing. + const TiffEntry* cropOrigin = raw->getEntry(TiffTag::DEFAULTCROPORIGIN); + const TiffEntry* cropSize = raw->getEntry(TiffTag::DEFAULTCROPSIZE); + // 64-bit so the doubled origin and the sum cannot wrap a 32-bit value past + // the frame-size guard. + uint64_t activeW = + uint64_t{cropSize->getU32(0)} + (2 * cropOrigin->getU32(0)); + uint64_t activeH = + uint64_t{cropSize->getU32(1)} + (2 * cropOrigin->getU32(1)); + if (activeW > width || activeH > height) + ThrowRDE("Active area (%llu; %llu) exceeds the decoded frame (%u; %u)", + static_cast(activeW), + static_cast(activeH), width, height); + mRaw->subFrame(iRectangle2D(0, 0, implicit_cast(activeW), + implicit_cast(activeH))); + applyCrop = false; +} + void ArwDecoder::DecodeARW2(ByteStream input, uint32_t w, uint32_t h, uint32_t bpp) { diff --git a/src/librawspeed/decoders/ArwDecoder.h b/src/librawspeed/decoders/ArwDecoder.h index b84ed6c58..499c7d76b 100644 --- a/src/librawspeed/decoders/ArwDecoder.h +++ b/src/librawspeed/decoders/ArwDecoder.h @@ -54,6 +54,7 @@ class ArwDecoder final : public AbstractTiffDecoder { RawImage decodeSRF(); void DecodeARW2(ByteStream input, uint32_t w, uint32_t h, uint32_t bpp); void DecodeLJpeg(const TiffIFD* raw); + void DecodeARW6(const TiffIFD* raw); void DecodeUncompressed(const TiffIFD* raw) const; static void SonyDecrypt(Array1DRef ibuf, Array1DRef obuf, int len, uint32_t key); diff --git a/src/librawspeed/decompressors/CMakeLists.txt b/src/librawspeed/decompressors/CMakeLists.txt index 8933a3ad1..9330c48d1 100644 --- a/src/librawspeed/decompressors/CMakeLists.txt +++ b/src/librawspeed/decompressors/CMakeLists.txt @@ -60,6 +60,9 @@ FILE(GLOB SOURCES "SonyArw1Decompressor.h" "SonyArw2Decompressor.cpp" "SonyArw2Decompressor.h" + "SonyArw6Decompressor.cpp" + "SonyArw6Decompressor.h" + "SonyArw6LogToLinear.h" "UncompressedDecompressor.cpp" "UncompressedDecompressor.h" "VC5Decompressor.cpp" diff --git a/src/librawspeed/decompressors/SonyArw6Decompressor.cpp b/src/librawspeed/decompressors/SonyArw6Decompressor.cpp new file mode 100644 index 000000000..24e27cd71 --- /dev/null +++ b/src/librawspeed/decompressors/SonyArw6Decompressor.cpp @@ -0,0 +1,1366 @@ +/* + RawSpeed - RAW file decoder. + + Copyright (C) 2026 Kabir Kwatra + + This library 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 2 of the License, or (at your option) any later version. + + This library 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 this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA +*/ + +// This is a clean-room implementation of the Sony "ARW 6.0" codec (the camera's +// "Compressed RAW 2" lossy mode, TIFF compression 32766), used by the A7R VI +// (ILCE-7RM6) and A7 V (ILCE-7M5). The bitstream format was recovered by +// observing the decoder's input/output behaviour, and the implementation is +// validated byte-exact (MAE 0) against that reference output. +// +// Pipeline: +// container strip -> 1-4 spatial tiles (2x2 grid for a large frame; a single +// tile when the frame fits in one) +// per tile -> picture header (per-resolution byte offsets) +// -> 4 components: Y-detail, Y-LL, Cb, Cr +// per component -> 5 resolutions (1 LL0 + 3 detail levels + [Y-LL]) +// -> per-row framing table (offset/length/qbits) +// -> GCLI bitplane entropy decode +// -> inverse reversible 5/3 wavelet (LL0 + 3 detail levels) +// luma -> two side-by-side base wavelet planes combined by a post-filter +// -> log->linear map: out = LUT[clamp(coeff + 2048)] +// chroma -> colour-convert against the luma reference +// YCC -> RGGB mosaic compose + 2x2 tile placement + +#include "rawspeedconfig.h" +#include "decompressors/SonyArw6Decompressor.h" +#include "adt/Array2DRef.h" +#include "adt/Casts.h" +#include "adt/DefaultInitAllocatorAdaptor.h" +#include "common/Common.h" +#include "common/RawImage.h" +#include "decoders/RawDecoderException.h" +#include "decompressors/SonyArw6LogToLinear.h" +#include "io/Buffer.h" +#include "io/ByteStream.h" +#include "io/Endianness.h" +#include +#include +#include +#include +#include +#include + +namespace rawspeed { + +namespace { + +// ------------------------------------------------------------------------- // +// Code: the ARW6 bit reader. Big-endian 64-bit words, MSB-first, +// with a total bit budget. Single-bit reads consume the accumulator MSB-first; +// a fresh word's 64 bits are consumed across 64 reads (bit indices 63..0). +// ------------------------------------------------------------------------- // +class Code final { + const uint8_t* buf; + int len; + + uint64_t acc = 0; + int wi = 0; // index of next byte-word to load + int nwords; // remaining whole 64-bit words still loadable + int bitpos = 0; // index of the bit being consumed + +public: + int flag = 0; // 0 = ok, 2 = exhausted + int budget; // total remaining bit budget (countdown) + + Code(const uint8_t* buf_, int len_) + : buf(buf_), len(len_), nwords((len_ + 7) >> 3), budget(len_ * 8) {} + + // Load the next 64-bit big-endian word; returns false if out of words. + bool refill() { + if (nwords <= 0) { + flag = 2; + return false; + } + nwords -= 1; + uint64_t w = 0; + for (int b = 0; b < 8; ++b) { + int idx = (wi * 8) + b; + uint64_t byte = (idx < len) ? static_cast(buf[idx]) : 0; + w = (w << 8) | byte; + } + acc = w; + wi += 1; + bitpos = 63; + return true; + } + + // The canonical single-bit MSB-first read. + int readBit() { + if (budget <= 0) { + flag = 2; + return 0; + } + budget -= 1; + int old = bitpos; + bitpos = old - 1; + if (old > 0) + return static_cast((acc >> (old - 1)) & 1U); + if (!refill()) + return 0; + return static_cast((acc >> 63) & 1U); + } + + // Read n (0..56) bits MSB-first; bit-for-bit equivalent to n readBit() calls. + // Fast path when all n bits lie within the current word and budget allows; + // otherwise falls back to per-bit reads (identical boundary/flag behaviour). + uint64_t readBitsMsb(int n) { + if (n <= bitpos && budget >= n) { + budget -= n; + const int newpos = bitpos - n; + const uint64_t v = (acc >> newpos) & ((UINT64_C(1) << n) - 1U); + bitpos = newpos; + return v; + } + uint64_t v = 0; + for (int i = 0; i < n; ++i) + v = (v << 1) | static_cast(readBit()); + return v; + } +}; + +// ------------------------------------------------------------------------- // +// Update the running significance/qbits `run`. +// read bit1; 0 -> return unchanged. +// bit1==1, read bit2: +// bit2==1 -> DECREMENT: run-=1 (clamp 0); while next bit==0: run-=1. +// bit2==0 -> INCREMENT: run += 1 + (#0-bits until a 1). +// ------------------------------------------------------------------------- // +void updateBits(Code& code, int& run) { + int budget0 = code.budget; + if (budget0 <= 0) { + code.flag = 2; + run = 0; + return; + } + + int bit1 = code.readBit(); + if (bit1 == 0) + return; // significant at current run + if (code.flag != 0) + return; + + if (budget0 == 1) { + code.flag = 2; // consumed the only budget on bit1; can't read bit2 + return; + } + int bit2 = code.readBit(); + if (code.flag != 0 && bit2 == 0) { + // refill failure on bit2 zeroes run (matches the reference on exhaustion). + run = 0; + return; + } + + if (bit2 != 0) { + // ---- DECREMENT path ---- + int r = run - 1; + if (r < 0) { + run = 0; + return; + } + run = r; + if (r == 0) + return; + while (true) { + if (code.budget <= 0) { + code.flag = 2; + run = 0; + return; + } + int bit = code.readBit(); + if (bit) + return; // 1-bit terminates + if (code.flag != 0) { + run = 0; + return; + } + run -= 1; + if (run <= 0) + return; + } + } else { + // ---- INCREMENT path ---- run += 1 + zeros until a 1-bit + if (code.budget <= 0) { + code.flag = 2; + return; // run unchanged + } + int neg = -1; + while (true) { + if (code.budget <= 0) { + code.flag = 2; + return; // run unchanged on exhaustion + } + int bit = code.readBit(); + if (code.flag != 0 && bit == 0) + return; // refill failure -> run unchanged + if (bit) { + run += (-neg); + return; + } + neg -= 1; + } + } +} + +// Inlined re-read used by code2coef2Row after a zero-group run (run was 0). +// Reads a unary code: run = 1 + (#leading 0-bits before a 1-bit). +void inlineReadRun0(Code& code, int& run) { + if (code.budget <= 0) { + code.flag = 2; + return; + } + int neg = -1; + while (true) { + if (code.budget <= 0) { + code.flag = 2; + return; + } + int bit = code.readBit(); + if (code.flag != 0 && bit == 0) + return; + if (bit) { + run = -neg; + return; + } + neg -= 1; + } +} + +// Read 4 magnitudes packed as one 4*qbits-wide MSB-first field (top group = +// out[0]). If signFlag>0, applies GCLI refinement per magnitude. +void decodeMagRev(Code& code, std::array& out, int qbits, + int signFlag) { + // `qbits` is the running significance count, which `updateBits` can drive + // arbitrarily high on malformed input; a real magnitude field is tiny. Reject + // anything that could make the shifts below undefined (a sane bound well + // above any valid value and below the 64-bit shift-width limit). + if (qbits < 0 || qbits >= 22) + ThrowRDE("ARW6: invalid magnitude bit-width %d", qbits); + std::array vals = {0, 0, 0, 0}; + if (qbits > 0) { + int total = 4 * qbits; + uint64_t word = code.readBitsMsb(total); + uint64_t mask = (1ULL << qbits) - 1; + for (int k = 0; k < 4; ++k) + vals[k] = static_cast((word >> ((3 - k) * qbits)) & mask); + } + if (signFlag > 0) { + int sh = signFlag - 1; + for (int k = 0; k < 4; ++k) { + int64_t v = vals[k]; + if (v >= 1) { + int64_t r = (((v << 1) | 1) << sh) - (v & 1); + vals[k] = (r < 0x7fffffff) ? static_cast(r) : 0x7fffffff; + } + } + } + out = vals; +} + +// One sign bit per magnitude >= 1. +void decodeSignRev(Code& code, std::array& out) { + for (int k = 0; k < 4; ++k) { + int32_t v = out[k]; + if (v >= 1) { + int s = code.readBit(); + // 64-bit intermediate: v can reach the INT32 saturation value from the + // magnitude refinement, where `2 * v` would overflow int. + out[k] = static_cast(v - (int64_t{2} * v * s)); + } + } +} + +// Decode one subband row into out[ngroups*4] (4 int32 coeffs/group). +void code2coef2Row(Code& code, int m, int ngroups, std::vector& out) { + int n = ngroups * 4; + out.assign(n, 0); + if (code.flag != 0) + return; + + int run = 0; + updateBits(code, run); + + if (ngroups - 1 < 0) + return; + + int g = 0; // current group index + int oi = 0; // output index = g*4 + while (g < ngroups) { + if (run != 0) { + // ---- significant group ---- + std::array grp = {0, 0, 0, 0}; + decodeMagRev(code, grp, run, m); + if (g < ngroups - 1) + updateBits(code, run); + decodeSignRev(code, grp); + out[oi] = grp[0]; + out[oi + 1] = grp[1]; + out[oi + 2] = grp[2]; + out[oi + 3] = grp[3]; + if (code.flag != 0) + return; // remaining groups already zero + g += 1; + oi += 4; + } else { + // ---- zero-group run (exp-golomb skip) ---- + int remaining = ngroups - g; + if (remaining < 2) + break; + int k = 0; + int value = 1; // = 2^k tracker + bool terminated = false; + while (true) { + if (code.budget <= 0) { + code.flag = 2; + break; + } + int bit = code.readBit(); + if (code.flag != 0 && bit == 0) { + code.flag = 2; + break; + } + if (bit) { + terminated = true; + break; + } + // bit == 0: extend exponent + value = 2 << k; + k += 1; + if (value >= remaining) + break; + } + if (!terminated) + break; + // read k mantissa bits + int mant = 0; + for (int i = 0; i < k; ++i) { + if (code.budget <= 0) { + code.flag = 2; + mant = (mant << 1); + continue; + } + mant = (mant << 1) | code.readBit(); + } + int skip = value + ((k > 0) ? (mant & ((1 << k) - 1)) : 0); + g += skip; + oi += skip * 4; + if (g >= ngroups) + break; + // inlined re-read of next run (run was 0) + run = 0; + inlineReadRun0(code, run); + if (code.flag != 0) + break; + if (run >= 0x14) + break; + } + } +} + +// CoefDiffDecode: horizontal cumulative (delta) decode with int16 wraparound. +void coefDiffDecode(std::vector& coef, int n) { + if (n < 2) + return; + int32_t acc = coef[0]; + for (int i = 1; i < n; ++i) { + int32_t s = + static_cast(static_cast(acc + coef[i]) & 0xffffU); + if (s >= 0x8000) + s -= 0x10000; + coef[i] = s; + acc = s; + } +} + +// ------------------------------------------------------------------------- // +// A 2D row-major grid. `Grid` (int16) holds the wavelet/entropy coefficients, +// which are always wrapped into signed-16-bit range; `Plane` (uint16) holds the +// post-LUT output planes (Y/Cb/Cr), whose values can reach the LUT ceiling +// (~39k, above the 32800 white point) and so need the wider unsigned type. +// ------------------------------------------------------------------------- // +template struct GridT { + // Skip-zeroing allocator (as VC5Decompressor uses): the no-argument vector + // ctor leaves storage uninitialized. `GridT(w, h)` still zero-fills via the + // (n, 0) ctor for the callers that rely on unwritten cells reading 0 (the + // entropy subband grids, Y-LL resize, luma seam); `GridT(w, h, NoInit{})` + // skips the fill for grids whose every cell is written before any read. + std::vector> d; + int w = 0; + int h = 0; + + struct NoInit {}; + + GridT() = default; + GridT(int w_, int h_) : d(static_cast(w_) * h_, 0), w(w_), h(h_) {} + GridT(int w_, int h_, NoInit) + : d(static_cast(w_) * h_), w(w_), h(h_) {} + + T& at(int y, int x) { return d[static_cast(y) * w + x]; } + [[nodiscard]] T at(int y, int x) const { + return d[static_cast(y) * w + x]; + } +}; + +using Grid = GridT; // wavelet / entropy coefficients +using Plane = GridT; // post-LUT output planes + +// Reduce a value modulo 2^16 into signed-16-bit range (C++20 two's complement). +inline int16_t wrapI16(int64_t v) { return static_cast(v); } + +// A bounded view of a component's bitstream bytes. +struct CompBytes { + const uint8_t* data; + int len; +}; + +// ------------------------------------------------------------------------- // +// Framing parsers. +// ------------------------------------------------------------------------- // + +// A picture-header record: per-TU byte offsets into the component bitstream. +struct PicRecord { + int count = 0; + std::array offsets{}; +}; + +// Parse the picture header. `region` = the full tile region (the 16-byte +// sub-header is part of it); the picture-info buffer = region[0x10:]. +// Returns up to 5 records, each with per-TU byte offsets into the component +// bitstream (which begins at region[0x80]). +std::array parsePictureHeader(const uint8_t* region, + int regionLen) { + auto u24 = [&](int o) -> int { + int a = 0x10 + o; + if (a + 2 >= regionLen) + ThrowRDE("ARW6 picture header truncated"); + return (region[a] << 16) | (region[a + 1] << 8) | region[a + 2]; + }; + + std::array bases{}; + for (int kk = 0; kk < 4; ++kk) + bases[kk] = u24(kk * 3) << 4; + + std::array recs{}; + std::array counts{}; + std::array, 5> lens{}; + int nrec = 0; + int off = 0x20; + for (int res = 0; res < 5; ++res) { + int a = 0x10 + off; + if (a >= regionLen) + break; + int cnt = region[a] & 0xf; + if (cnt > 9) + break; + int p = off + 1; + for (int i = 0; i < cnt; ++i) { + lens[res][i] = u24(p) << 4; + p += 3; + } + counts[res] = cnt; + nrec += 1; + off += (cnt <= 4) ? 0x10 : 0x20; + } + + // cumulative per-resolution base offsets (running add). Accumulate in 64 + // bits: the file-derived bases/lengths can each be ~2^28, so summing them in + // int would overflow. Offsets that land outside the region are clamped to a + // sentinel (regionLen) so the bounds checks in the consumers reject them. + std::array rb{}; + rb[0] = 0; + rb[1] = bases[0]; + rb[2] = int64_t{bases[1]} + rb[1]; + rb[3] = int64_t{bases[2]} + rb[2]; + rb[4] = int64_t{bases[3]} + rb[3]; + + for (int i = 0; i < nrec; ++i) { + recs[i].count = counts[i]; + int64_t run = rb[i]; + for (int x = 0; x < counts[i]; ++x) { + recs[i].offsets[x] = + (run >= 0 && run < regionLen) ? static_cast(run) : regionLen; + run += lens[i][x]; + } + } + return recs; +} + +// A per-row framing entry. +struct FrameRow { + int byteOff; // byte offset relative to the TU offset + int length; // entropy data byte length + std::array qbits; // per-subband 4-bit qbits (w23 of them) +}; + +struct ResTable { + int headerLen = 0; + int nRows = 0; + int w23 = 0; + std::vector rows; +}; + +// Parse the per-row framing table. +// `buf` = component bitstream; `off` = this TU's byte offset. +ResTable parseResolutionTable(const uint8_t* buf, int bufLen, int off) { + // Subtraction form (and the off<0 guard) so a negative/overflowed offset + // cannot pass via signed overflow of off+16. + if (off < 0 || off > bufLen - 16) + ThrowRDE("ARW6 resolution header out of bounds"); + const uint8_t* h = buf + off; + int sz16 = (h[0] << 8) | h[1]; + int hlen = (sz16 << 4) + 0x10; + if (h[5] != 0x40 || h[9] != 0x10) + ThrowRDE("ARW6 resolution header marker mismatch"); + int w23 = (h[6] >> 6) & 3; + int nRows = (h[7] << 8) | h[8]; + if (nRows > 0x200) + ThrowRDE("ARW6 too many rows: %i", nRows); + + // The per-row table is a MSB-first BE bitstream starting at byte 16. Bound + // the reads by the available bytes in the TU header. + int tabBytesAvail = bufLen - (off + 16); + int bitp = 0; + auto rd = [&](int nbits) -> int { + int v = 0; + for (int i = 0; i < nbits; ++i) { + int byteIdx = 16 + (bitp >> 3); + if (byteIdx >= 16 + tabBytesAvail || off + byteIdx >= bufLen) + ThrowRDE("ARW6 framing table out of bounds"); + int bit = (h[byteIdx] >> (7 - (bitp & 7))) & 1; + v = (v << 1) | bit; + bitp += 1; + } + return v; + }; + + ResTable t; + t.headerLen = hlen; + t.nRows = nRows; + t.w23 = w23; + t.rows.reserve(nRows); + int cur = hlen; + for (int i = 0; i < nRows; ++i) { + FrameRow r{}; + r.length = rd(16); + for (int j = 0; j < w23; ++j) + r.qbits[j] = rd(4); + r.byteOff = cur; + t.rows.push_back(r); + cur += r.length; + } + return t; +} + +// ------------------------------------------------------------------------- // +// Per-resolution subband geometry: {slot -> (W, y0, y1, yoff)}. +// ------------------------------------------------------------------------- // +struct SubGeom { + int W; + int y0; + int y1; + int yoff; +}; + +// Subband slot indices: S20=LL, S28=HL (highH,lowV), S30=LH (lowH,highV), +// S38=HH (highH,highV). (Names are the byte offsets they occupy in the stream.) +enum Slot : uint8_t { S20 = 0, S28 = 1, S30 = 2, S38 = 3 }; + +// chroma_geometry(Wb): the FF/generic dyadic pyramid geometry. Derived from the +// validated reference (Wb = LL0 width). The y-ranges are a function of the +// component height BR (block-rows): LL0 height = ceil(BR/8)+1 rows in [2, ...]. +// For the validated FF case (BR=1668, Wb=313) this reproduces the reference +// exactly. For other heights the same dyadic relations are used. +struct LevelGeom { + // active slots; S20 for level 0, S28/S30/S38 for detail levels. + std::array g{}; + std::array active{}; +}; + +// Canvas origin for the line-based 5/3 wavelet: the smallest top margin a>=6 +// such that the symmetric-extended height (BR + 2a) is congruent to 8 (mod 16). +// Gives a=10 for FF (BR=1668) and a=7 for APS-C (BR=2186) -- and is what all +// the per-subband y-coordinates are derived from. +int arw6CanvasOrigin(int BR) { + // 2*a is even, so a solution only exists for even BR; the residue repeats + // with period 16, so it is found within 8 steps. Bounded to avoid spinning + // forever on a malformed (odd) BR (callers also reject odd BR up front). + for (int a = 6; a < 6 + 16; ++a) { + if ((((2 * a) + BR) % 16) == 8) + return a; + } + ThrowRDE("ARW6: no canvas origin for BR=%d", BR); +} + +// Build the per-resolution subband geometry for a component of LL0-width Wb and +// height BR: a dyadic 3-level inverse-5/3 pyramid over the canvas extent +// [a, a+BR], with vLow = ceil-split and vHigh = floor-split at each level. +// Reproduces the reference geometry byte-exact for both FF (BR=1668, Wb=313) +// and APS-C (BR=2186, Wb=412). +std::array chromaGeometry(int Wb, int BR) { + const int a = arw6CanvasOrigin(BR); + // Three dyadic splits of the extent [u0,u1); each split's low half feeds the + // next. split[0] -> res3, split[1] -> res2, split[2] -> res1 (and res0 = LL, + // which shares the deepest split). Each entry is + // {vLowY0,vLowY1,vHighY0,vHighY1}. + std::array, 3> sp{}; + int u0 = a; + int u1 = a + BR; + for (auto& s : sp) { + const int l0 = (u0 + 1) / 2; + const int l1 = (u1 + 1) / 2; // ceil + const int h0 = u0 / 2; + const int h1 = u1 / 2; // floor + s = {l0, l1, h0, h1}; + u0 = l0; + u1 = l1; + } + const std::array resSplit = {2, 2, 1, 0}; // res r -> split index + const std::array wr = {Wb, Wb, 2 * Wb, 4 * Wb}; + const std::array yoffLow = {1, 1, 1, 2}; + const std::array yoffHigh = {1, 0, 1, 2}; + std::array out{}; + for (int r = 0; r < 4; ++r) { + const auto& s = sp[resSplit[r]]; + out[r].g[S20] = {wr[r], s[0], s[1], yoffLow[r]}; // LL (vLow) + out[r].g[S28] = {wr[r], s[0], s[1], yoffLow[r]}; // HL (vLow) + out[r].g[S30] = {wr[r], s[2], s[3], yoffHigh[r]}; // LH (vHigh) + out[r].g[S38] = {wr[r], s[2], s[3], yoffHigh[r]}; // HH (vHigh) + if (r == 0) + out[r].active[S20] = true; + else + out[r].active[S28] = out[r].active[S30] = out[r].active[S38] = true; + } + return out; +} + +// Per-rowgroup band-decode parameters. +struct BandTask { + int height; // subband rows produced per rowgroup + int rg; // current rowgroup index + int flag; // bit0 set -> apply CoefDiffDecode (LL0 path) + int m; // per-band qbits for the magnitude decode +}; + +// Decode the rows of one subband band produced by rowgroup `t.rg` from the +// (shared) rowgroup Code into `grid`. CoefDiffDecode is applied iff t.flag bit0 +// is set (the LL0 path). Stores wrap to signed 16-bit. +void decodeBandRows(Code& code, const SubGeom& sg, Grid& grid, + const BandTask& t, std::vector& scratch) { + int w8 = sg.yoff + (t.height * t.rg); + int r0 = std::max(w8, sg.y0); + int r1 = std::min(w8 + t.height, sg.y1); + int G = (sg.W + 3) >> 2; + for (int r = r0; r < r1; ++r) { + code2coef2Row(code, t.m, G, scratch); + if (t.flag & 1) + coefDiffDecode(scratch, sg.W); + int gy = r - sg.y0; + for (int x = 0; x < sg.W; ++x) + grid.at(gy, x) = wrapI16(scratch[x]); + } +} + +// Decode one resolution (one TU) into its subband grids. +// level==0 & is_ll==0 : LL path, single band S20 (flag=1), height=1 +// level==0 & is_ll==1 : LL path, single band S20 (flag=0), height=8 +// level>0 : detail, 3 bands S28,S30,S38 (flag=0), +// height=1<<(level-1) +void decodeResolution(CompBytes comp, int off, int level, int isLl, + const LevelGeom& geom, std::array& grids) { + ResTable tab = parseResolutionTable(comp.data, comp.len, off); + + // allocate active grids + for (int s = 0; s < 4; ++s) { + if (geom.active[s]) + grids[s] = Grid(geom.g[s].W, geom.g[s].y1 - geom.g[s].y0); + } + + int height; + int flag; + std::array order{}; + int nOrder; + if (level == 0 && isLl == 0) { + height = 1; + flag = 1; + order = {S20, 0, 0}; + nOrder = 1; + } else if (level == 0 && isLl == 1) { + height = 8; + flag = 0; + order = {S20, 0, 0}; + nOrder = 1; + } else { + height = 1 << (level - 1); + flag = 0; + order = {S28, S30, S38}; + nOrder = 3; + } + + std::vector scratch; + for (int rg = 0; rg < tab.nRows; ++rg) { + const FrameRow& row = tab.rows[rg]; + if (row.length == 0) + continue; + int dataOff = off + row.byteOff; + if (dataOff < 0 || row.length < 0 || dataOff > comp.len - row.length) + ThrowRDE("ARW6 entropy buffer out of bounds"); + // One fresh Code per rowgroup, SHARED across the (up to 3) bands, which are + // decoded sequentially (HL, LH, HH) from the same bitstream. + Code code(comp.data + dataOff, row.length); + for (int si = 0; si < nOrder; ++si) { + int slot = order[si]; + if (!geom.active[slot]) + continue; + // The per-band qbits for the magnitude decode = the per-row 4-bit field. + int m = 0; + if (si < tab.w23) + m = row.qbits[si]; + else if (tab.w23 > 0) + m = row.qbits[0]; + decodeBandRows(code, geom.g[slot], grids[slot], {height, rg, flag, m}, + scratch); + } + } +} + +// ------------------------------------------------------------------------- // +// Inverse reversible 5/3 transform (interleaved, mirror boundary, int16 wrap). +// ------------------------------------------------------------------------- // + +// 1D inverse 5/3 along a contiguous interleaved buffer S of length N. +// low_even selects whether the LOW band lands on even positions. +void inv53_1d(std::vector& S, int N, bool lowEven) { + if (N <= 1) { + for (int i = 0; i < N; ++i) + S[i] = wrapI16(S[i]); + return; + } + // int32 suffices: values are int16-range, so the lift sums (two int16 + 2) + // never exceed int32. + auto sm = [&](int i) -> int { return (i - 1 >= 0) ? S[i - 1] : S[1]; }; + auto sp = [&](int i) -> int { return (i + 1 < N) ? S[i + 1] : S[N - 2]; }; + int loStart = lowEven ? 0 : 1; + int hiStart = lowEven ? 1 : 0; + // predict (LOW): L -= (S[i-1]+S[i+1]+2)>>2 + for (int i = loStart; i < N; i += 2) + S[i] = wrapI16(S[i] - ((sm(i) + sp(i) + 2) >> 2)); + // update (HIGH): H += (S[i-1]+S[i+1])>>1 + for (int i = hiStart; i < N; i += 2) + S[i] = wrapI16(S[i] + ((sm(i) + sp(i)) >> 1)); +} + +// Inverse 5/3 combining two bands into a single grid along the given axis. +// axis 0 = vertical (interleave rows), axis 1 = horizontal (interleave cols). +Grid inv53Axis(const Grid& low, const Grid& high, int axis, bool lowEven) { + bool horiz = (axis == 1); + int nL = horiz ? low.w : low.h; + int nH = horiz ? high.w : high.h; + int span = horiz ? low.h : low.w; // number of independent 1D lines + int N = nL + nH; + int loBase = lowEven ? 0 : 1; + int hiBase = lowEven ? 1 : 0; + // Every cell is written by the scatter below, so skip zero-init. + Grid out = + horiz ? Grid(N, span, Grid::NoInit{}) : Grid(span, N, Grid::NoInit{}); + std::vector S(N); + for (int line = 0; line < span; ++line) { + if (horiz) { + for (int i = 0; i < nL; ++i) + S[loBase + 2 * i] = low.at(line, i); + for (int i = 0; i < nH; ++i) + S[hiBase + 2 * i] = high.at(line, i); + } else { + for (int i = 0; i < nL; ++i) + S[loBase + 2 * i] = low.at(i, line); + for (int i = 0; i < nH; ++i) + S[hiBase + 2 * i] = high.at(i, line); + } + inv53_1d(S, N, lowEven); + for (int k = 0; k < N; ++k) { + if (horiz) + out.at(line, k) = static_cast(S[k]); + else + out.at(k, line) = static_cast(S[k]); + } + } + return out; +} + +// Vertical inverse 5/3 specialised to be cache-friendly: interleave the +// low/high rows into the output, then lift across whole rows (sequential +// sweeps) instead of the per-column strided gather/scatter inv53Axis(axis=0) +// would do. Bit-for- bit identical to inv53Axis(low, high, 0, lowEven): low.w +// == high.w holds for every vertical combine (sibling subbands share a width), +// and the lifting reads LOW from HIGH rows (predict) then HIGH from the +// just-predicted LOW rows (update), exactly as inv53_1d does on the interleaved +// buffer. +Grid inv53Vertical(const Grid& low, const Grid& high, bool lowEven) { + const int span = low.w; + const int nL = low.h; + const int nH = high.h; + const int N = nL + nH; + const int loBase = lowEven ? 0 : 1; + const int hiBase = lowEven ? 1 : 0; + // For N >= 2 every row is written (the interleave covers all rows, then the + // lifting overwrites in place), so skip zero-init. The degenerate N <= 1 path + // reads cells back during its wrap, so keep it zero-filled there. + Grid out = (N >= 2) ? Grid(span, N, Grid::NoInit{}) : Grid(span, N); + + for (int i = 0; i < nL; ++i) { + const int16_t* src = &low.d[static_cast(i) * low.w]; + int16_t* dst = &out.d[static_cast(loBase + 2 * i) * span]; + for (int x = 0; x < span; ++x) + dst[x] = src[x]; + } + for (int i = 0; i < nH; ++i) { + const int16_t* src = &high.d[static_cast(i) * high.w]; + int16_t* dst = &out.d[static_cast(hiBase + 2 * i) * span]; + for (int x = 0; x < span; ++x) + dst[x] = src[x]; + } + + if (N <= 1) { + for (int x = 0; x < N * span; ++x) + out.d[x] = wrapI16(out.d[x]); + return out; + } + + const int loStart = lowEven ? 0 : 1; + const int hiStart = lowEven ? 1 : 0; + // predict (LOW rows): row -= (above + below + 2) >> 2 + for (int i = loStart; i < N; i += 2) { + const int im = (i - 1 >= 0) ? (i - 1) : 1; + const int ip = (i + 1 < N) ? (i + 1) : (N - 2); + int16_t* row = &out.d[static_cast(i) * span]; + const int16_t* a = &out.d[static_cast(im) * span]; + const int16_t* b = &out.d[static_cast(ip) * span]; + for (int x = 0; x < span; ++x) + row[x] = wrapI16(row[x] - ((a[x] + b[x] + 2) >> 2)); + } + // update (HIGH rows): row += (above + below) >> 1 + for (int i = hiStart; i < N; i += 2) { + const int im = (i - 1 >= 0) ? (i - 1) : 1; + const int ip = (i + 1 < N) ? (i + 1) : (N - 2); + int16_t* row = &out.d[static_cast(i) * span]; + const int16_t* a = &out.d[static_cast(im) * span]; + const int16_t* b = &out.d[static_cast(ip) * span]; + for (int x = 0; x < span; ++x) + row[x] = wrapI16(row[x] + ((a[x] + b[x]) >> 1)); + } + return out; +} + +// One 2D inverse 5/3 level: VERTICAL first, then HORIZONTAL. +Grid inv53Level(const Grid& LL, const Grid& HL, const Grid& LH, const Grid& HH, + bool vlowEven) { + Grid Lcol = inv53Vertical(LL, LH, vlowEven); // low-horizontal cols + Grid Hcol = inv53Vertical(HL, HH, vlowEven); // high-horizontal cols + return inv53Axis(Lcol, Hcol, /*axis=*/1, /*lowEven=*/true); +} + +// Reconstruct the full dyadic pyramid: LL0 + 3 detail levels (coarse->fine). +// out_y0 = per-level output y0; vlow_even = (out_y0 % 2 == 0). +Grid reconstructPyramid(const Grid& LL0, const std::array& d1, + const std::array& d2, + const std::array& d3, + const std::array& outY0) { + Grid cur = LL0; + const std::array*, 3> details = {&d1, &d2, &d3}; + for (int i = 0; i < 3; ++i) { + const auto& d = *details[i]; + bool ve = (outY0[i] % 2 == 0); + cur = inv53Level(cur, d[S28], d[S30], d[S38], ve); + } + return cur; +} + +// ------------------------------------------------------------------------- // +// Luma post-filter: a vertical-5/3 ring combined with a horizontal-5/3 pass. +// ------------------------------------------------------------------------- // + +inline int64_t u16v(int64_t v) { return static_cast(v); } + +// The PostFilter vertical-ring out0 line (the LOW vertical band). +void pfVpredict(const std::vector& s0, + const std::vector& above, + const std::vector& below, int w, + std::vector& out0) { + out0.assign(w, 0); + for (int i = 0; i < w; ++i) { + int64_t ab0 = wrapI16(above[i]); + int64_t bl0 = wrapI16(below[i]); + int64_t ab1 = wrapI16(above[std::min(i + 1, w - 1)]); + int64_t bl1 = wrapI16(below[std::min(i + 1, w - 1)]); + int64_t res; + if (i == w - 1) { + uint32_t last = static_cast(ab0 + bl0); + res = (static_cast( + static_cast(2 * u16v(s0[i]) - (last >> 1))) >> + 1); + } else { + uint32_t summ = static_cast(ab0 + ab1 + bl0 + bl1); + res = (static_cast( + static_cast(2 * u16v(s0[i]) - (summ >> 2))) >> + 1); + } + out0[i] = wrapI16(res); + } +} + +// The PostFilter horizontal-5/3 write: interleave LOW (odd cols) + predicted. +void pfHwrite(const std::vector& LO, const std::vector& HI, + const std::vector& LOX, int w, + std::vector& res) { + res.assign(static_cast(2) * w, 0); + uint32_t w11 = static_cast(wrapI16(LO[0]) + wrapI16(LOX[0])); + res[0] = wrapI16(static_cast(u16v(HI[0])) + (w11 >> 1)); + res[1] = wrapI16(wrapI16(LO[0])); + int64_t prev = wrapI16(LO[0]); + for (int i = 1; i < w; ++i) { + uint32_t acc = static_cast(wrapI16(LO[i]) + prev + + wrapI16(LOX[i]) + wrapI16(LOX[i - 1])); + res[2 * i] = wrapI16(static_cast(u16v(HI[i])) + (acc >> 2)); + res[2 * i + 1] = wrapI16(wrapI16(LO[i])); + prev = wrapI16(LO[i]); + } +} + +// One ring line: lo + hi bands. +struct RingLine { + std::vector lo; + std::vector hi; + bool valid = false; +}; + +// Run the streaming luma PostFilter over a column slice [xLo, xHi) of the two +// sub-wavelet planes (s0 = Y-detail recon, s1 = Y-LL grid). Produces a +// (H x 2*(xHi-xLo)) int16 luma-coeff plane (the log->linear map's source). +Grid postfilterPlane(const Grid& s0Plane, const Grid& s1Plane, int xLo, int xHi, + int y1, int margin = 8) { + int H = s0Plane.h; + int ncol = xHi - xLo; + int w = ncol + margin; + int COMPW = s0Plane.w; + + auto srow = [&](const Grid& plane, int r, std::vector& seg) { + seg.assign(w, 0); + int64_t lastv = 0; + for (int i = 0; i < w; ++i) { + int col = xLo + i; + if (col < COMPW) { + lastv = wrapI16(plane.at(r, col)); + seg[i] = lastv; + } else { + seg[i] = lastv; // clamp to last available column + } + } + }; + + Grid outPlane(2 * ncol, H); + std::array ring; + std::vector s0, s1, above, zeros(w, 0); + std::vector loTmp, line; + for (int cur = 1; cur <= H + 1; ++cur) { + int r = cur - 1; + int cm1 = cur - 1; + int cm2 = cur - 2; + if (cur <= y1 && r < H) { + srow(s0Plane, r, s0); + srow(s1Plane, r, s1); + if (0 == cm1) { + above = s1; + } else { + const RingLine& rl = ring[cm2 & 1]; + above = rl.valid ? rl.hi : zeros; + } + pfVpredict(s0, above, s1, w, loTmp); + ring[cm1 & 1].lo = loTmp; + ring[cm1 & 1].hi = s1; + ring[cm1 & 1].valid = true; + } + if (cur >= 2 && ring[cm2 & 1].valid) { + const RingLine& r2 = ring[cm2 & 1]; + const std::vector* lox; + if (y1 == cm1) { + lox = &r2.lo; + } else { + lox = ring[cm1 & 1].valid ? &ring[cm1 & 1].lo : &r2.lo; + } + pfHwrite(r2.lo, r2.hi, *lox, w, line); + int orow = cur - 2; + if (orow >= 0 && orow < H) { + for (int x = 0; x < 2 * ncol; ++x) + outPlane.at(orow, x) = wrapI16(line[x]); + } + } + } + return outPlane; +} + +// Combine the two side-by-side base wavelet planes into the full-width +// luma-coeff plane. +Grid reconstructLumaCoeff(const Grid& Ydet, const Grid& Yll, int totalW, + int half) { + int COMPW = Ydet.w; + int H = Ydet.h; + int seam = 2 * half; + Grid pf0 = postfilterPlane(Ydet, Yll, 0, half + 8, /*y1=*/H); + Grid pf1 = postfilterPlane(Ydet, Yll, half, COMPW, /*y1=*/H); + Grid luma(totalW, H); + for (int y = 0; y < H; ++y) { + for (int x = 0; x <= seam && x < totalW; ++x) + luma.at(y, x) = pf0.at(y, x); + // pf1 local col k -> output col seam+k, starting at local col 1. + for (int x = seam + 1; x < totalW; ++x) { + int local = x - seam; // 1, 2, ... + if (local < pf1.w) + luma.at(y, x) = pf1.at(y, local); + } + } + return luma; +} + +// ------------------------------------------------------------------------- // +// Per-tile reconstruction (region buffer -> RGGB CFA block). +// ------------------------------------------------------------------------- // + +// Decode a visual component's full subband pyramid (LL0 + 3 detail levels). +// ci: 0=Y-detail, 1=Cb, 2=Cr. +Grid decodeComponentPyramid(CompBytes comp, + const std::array& recs, int ci, + const std::array& geom, + int canvasOrigin) { + std::array, 4> g; + for (int lvl = 0; lvl < 4; ++lvl) { + if (ci >= recs[lvl].count) + ThrowRDE("ARW6: missing component %d in record %d", ci, lvl); + decodeResolution(comp, recs[lvl].offsets[ci], lvl, + /*isLl=*/0, geom[lvl], g[lvl]); + } + // Vertical inter-level parity origins for the 3 inverse-5/3 combine steps: + // the output origin of each step = {res2.y0, res3.y0, canvasOrigin} + // (= {3,5,10} for FF, {2,4,7} for APS-C). Derived from the geometry so it + // generalises across tile heights. + return reconstructPyramid( + g[0][S20], g[1], g[2], g[3], + {geom[2].g[S20].y0, geom[3].g[S20].y0, canvasOrigin}); +} + +// Log->linear map: lin = clamp(coeff + 2048, 0, 4095); Y = LUT[lin]. Fills +// `lin` (the shared grayscale reference) and `Yp` (the final luma plane). +void setLineLogLuma(const Grid& luma, Grid& lin, Plane& Yp) { + int H = luma.h; + int PW = luma.w; + for (int y = 0; y < H; ++y) { + for (int x = 0; x < PW; ++x) { + int v = std::clamp(static_cast(luma.at(y, x)) + 2048, 0, 4095); + lin.at(y, x) = static_cast(v); + Yp.at(y, x) = SonyArw6LogToLinear[v]; + } + } +} + +// Chroma colour-conversion against the luma reference: +// plane = LUT[clamp(((lin[2i]+lin[2i+1])>>1) + 2*coeff, 0, 4095)]. +Plane colorConvChroma(const Grid& cf, const Grid& lin, int COMPW) { + int H = lin.h; + Plane plane(COMPW, H, Plane::NoInit{}); // every cell written below + for (int y = 0; y < H; ++y) { + for (int i = 0; i < COMPW; ++i) { + int g = lin.at(y, 2 * i); + int h = lin.at(y, (2 * i) + 1); + int cval = (y < cf.h && i < cf.w) ? static_cast(cf.at(y, i)) : 0; + int v = std::clamp(((g + h) >> 1) + (2 * cval), 0, 4095); + plane.at(y, i) = SonyArw6LogToLinear[v]; + } + } + return plane; +} + +// Interleave Y/Cb/Cr into the RGGB CFA, fused with tile placement: +// block[2k , 2i ] = Cb[k, i] (R site) +// block[2k , 2i+1] = Y [1 + 2i] of plane row k (G) +// block[2k+1, 2i ] = Y [ 2i] of plane row k (G) +// block[2k+1, 2i+1] = Cr[k, i] (B site) +// and write the (2*BR x PW) block straight into the output at (x0, y0), clipped +// to the active (clipW x clipH) frame. Writing uint16 directly avoids +// materialising a full int32 CFA grid per tile and the separate serial copy. +void composeTileToOutput(Array2DRef out, const Plane& Yp, + const Plane& Cb, const Plane& Cr, int PW, int BR, + int x0, int y0, int clipW, int clipH) { + int halfW = PW / 2; + for (int k = 0; k < BR; ++k) { + const int oy0 = y0 + (2 * k); + const int oy1 = oy0 + 1; + if (oy0 >= clipH) + break; // all remaining rows are below the frame + const bool r1 = oy1 < clipH; + for (int i = 0; i < halfW; ++i) { + const int ox0 = x0 + (2 * i); + const int ox1 = ox0 + 1; + if (ox0 >= clipW) + break; // all remaining columns are right of the frame + const bool c1 = ox1 < clipW; + const int yEvenCol = (2 * i) + 1; // odd column, output row 2k + const int yOddCol = 2 * i; // even column, output row 2k+1 + out(oy0, ox0) = + static_cast((k < Cb.h && i < Cb.w) ? Cb.at(k, i) : 0); + if (c1) + out(oy0, ox1) = static_cast( + (k < Yp.h && yEvenCol < Yp.w) ? Yp.at(k, yEvenCol) : 0); + if (r1) + out(oy1, ox0) = static_cast( + (k < Yp.h && yOddCol < Yp.w) ? Yp.at(k, yOddCol) : 0); + if (r1 && c1) + out(oy1, ox1) = + static_cast((k < Cr.h && i < Cr.w) ? Cr.at(k, i) : 0); + } + } +} + +// Per-tile geometry + placement, parsed once (cheaply, no entropy decode) from +// the tile sub-header and picture header. Shared read-only by the (independent) +// component decodes, so it is split out from the heavy reconstruction. +struct TileCtx { + const uint8_t* region = nullptr; + int regionLen = 0; + int PW = 0; // tile width + int BR = 0; // Bayer-row count (tile height = 2*BR) + int COMPW = 0; // per-component width (PW/2) + int Wb = 0; // LL0 width + int half = 0; // base sub-wavelet width + int a = 0; // canvas origin + std::array recs{}; + std::array geom{}; + int x0 = 0; // output placement + int y0 = 0; +}; + +// The (up to) four independent per-tile component decodes. +enum TileComp { COMP_YDET = 0, COMP_YLL = 1, COMP_CB = 2, COMP_CR = 3 }; + +TileCtx parseTileCtx(const uint8_t* region, int regionLen) { + // Tile sub-header: a 1-byte format tag + "000", u32 index, u16 segW (=PW), + // u16 segH/2 (=BR), ... The tag byte varies by body ('0' on the A7R VI, 'A' + // on the A7 V); only the trailing "000" is the fixed marker. The geometry and + // picture-header validation below reject anything that slips past it. + if (region[1] != '0' || region[2] != '0' || region[3] != '0') + ThrowRDE("ARW6: bad tile sub-header marker"); + int PW = (region[8] << 8) | region[9]; + int BR = (region[10] << 8) | region[11]; + // BR must be even: arw6CanvasOrigin has no solution otherwise, and every real + // frame uses an even Bayer-row count. + if (PW <= 0 || BR <= 0 || (PW & 1) != 0 || (BR & 1) != 0 || PW > 10240 || + BR > 4096) + ThrowRDE("ARW6: bad tile geometry (%d x %d)", PW, 2 * BR); + + TileCtx c; + c.region = region; + c.regionLen = regionLen; + c.PW = PW; + c.BR = BR; + c.COMPW = PW / 2; + c.Wb = (c.COMPW + 7) / 8; + c.half = c.COMPW / 2; + c.a = arw6CanvasOrigin(BR); + c.recs = parsePictureHeader(region, regionLen); + c.geom = chromaGeometry(c.Wb, BR); + return c; +} + +// Decode one independent component for a tile. COMP_YLL returns the raw is_ll +// grid (resized against the Y-detail height later, in finishTile); the others +// return the reconstructed component pyramid. +Grid decodeTileComponent(const TileCtx& c, int comp) { + CompBytes cb{c.region + 0x80, c.regionLen - 0x80}; + if (comp == COMP_YLL) { + std::array yllGeom{}; + yllGeom[0].g[S20] = {c.COMPW, c.a, c.a + (2 * c.BR), 4}; + yllGeom[0].active[S20] = true; + std::array yllGrids; + if (c.recs[4].count < 1) + ThrowRDE("ARW6: missing Y-LL record"); + decodeResolution(cb, c.recs[4].offsets[0], /*level=*/0, + /*isLl=*/1, yllGeom[0], yllGrids); + return std::move(yllGrids[S20]); + } + int ci = (comp == COMP_YDET) ? 0 : (comp == COMP_CB ? 1 : 2); + return decodeComponentPyramid(cb, c.recs, ci, c.geom, c.a); +} + +// Combine a tile's decoded components (Y-detail pyramid, raw Y-LL, Cb/Cr coeff +// pyramids) into the RGGB CFA and write it into the output at the tile's +// placement, clipped to the active frame. +void finishTile(const TileCtx& c, const Grid& Ydet, const Grid& YllRaw, + const Grid& CbCoef, const Grid& CrCoef, + Array2DRef out, int clipW, int clipH) { + int H = Ydet.h; + + // Y-LL: resize the raw is_ll grid to the luma height. + Grid Yll(c.COMPW, H); + for (int y = 0; y < H && y < YllRaw.h; ++y) + for (int x = 0; x < c.COMPW; ++x) + Yll.at(y, x) = YllRaw.at(y, x); + + // Luma: combine the two side-by-side base planes via the post-filter, then + // the log->linear map. + Grid luma = reconstructLumaCoeff(Ydet, Yll, c.PW, c.half); + Grid lin(c.PW, H, Grid::NoInit{}); // every cell written by setLineLogLuma + Plane Yp(c.PW, H, Plane::NoInit{}); + setLineLogLuma(luma, lin, Yp); + + // Chroma: colour-conv each coeff pyramid against the luma reference. + Plane Cb = colorConvChroma(CbCoef, lin, c.COMPW); + Plane Cr = colorConvChroma(CrCoef, lin, c.COMPW); + + composeTileToOutput(out, Yp, Cb, Cr, c.PW, c.BR, c.x0, c.y0, clipW, clipH); +} + +} // namespace + +// ------------------------------------------------------------------------- // +// Per-tile reconstruction + compose into the CFA mosaic. +// ------------------------------------------------------------------------- // + +SonyArw6Decompressor::SonyArw6Decompressor(RawImage img, ByteStream input_, + int width_, int height_) + : mRaw(std::move(img)), input(input_), width(width_), height(height_) { + if (mRaw->getCpp() != 1 || mRaw->getDataType() != RawImageType::UINT16 || + mRaw->getBpp() != sizeof(uint16_t)) + ThrowRDE("Unexpected component count / data type"); + if (width <= 0 || height <= 0 || width > 10240 || height > 7168) + ThrowRDE("Unexpected image dimensions: (%d; %d)", width, height); +} + +void SonyArw6Decompressor::decompress() const { + const Array2DRef out(mRaw->getU16DataAsUncroppedArray2DRef()); + + // Parse the strip header: u32[0]=nseg, [2]=512 (data start), then nseg + // records of 6 u32 {w, h, end, f3, px, py}. + ByteStream hdr = input; + hdr.setByteOrder(Endianness::little); + uint32_t nseg = hdr.peekU32(0); + if (nseg < 1 || nseg > 4) + ThrowRDE("ARW6: unexpected tile count %u", nseg); + + // The container records start at u32 index 6. Compute per-tile byte ranges: + // record[i].end is the strip offset where tile i's data ends; tile 0 starts + // at 512. (record end==0 for the last tile -> ends at strip end.) + std::array tileEnd{}; + for (uint32_t i = 0; i < nseg; ++i) + tileEnd[i] = hdr.peekU32(6 + 6 * i + 2); + + uint32_t stripLen = input.getSize(); + std::array tileStart{}; + std::array tileStop{}; + tileStart[0] = 512; + for (uint32_t i = 0; i < nseg; ++i) { + tileStop[i] = (tileEnd[i] != 0) ? tileEnd[i] : stripLen; + if (i + 1 < nseg) + tileStart[i + 1] = tileStop[i]; + } + + // Each spatial tile is placed on the 2x2 grid by strip index (column = s/2, + // row = s%2). Parse every tile's headers up front (serially, cheaply) to + // validate its byte range/geometry and resolve placements: the left column's + // tile width sets the column-1 x-offset, and each tile's own height (2*BR) + // sets the row-1 y-offset (matching the historical placement). + std::array ctx{}; + for (uint32_t s = 0; s < nseg; ++s) { + if (tileStart[s] >= stripLen || tileStop[s] > stripLen || + tileStop[s] <= tileStart[s]) + ThrowRDE("ARW6: bad tile byte range"); + Buffer regionBuf = input.peekBuffer(stripLen).getSubView( + tileStart[s], tileStop[s] - tileStart[s]); + int regionLen = implicit_cast(regionBuf.getSize()); + if (regionLen < 0x80 + 16) + ThrowRDE("ARW6: tile region too small"); + ctx[s] = parseTileCtx(regionBuf.begin(), regionLen); + } + int leftColWidth = 0; + for (uint32_t s = 0; s < nseg; ++s) { + if (s / 2 == 0) + leftColWidth = ctx[s].PW; + } + for (uint32_t s = 0; s < nseg; ++s) { + int col = static_cast(s) / 2; + int rowi = static_cast(s) % 2; + ctx[s].x0 = col * (leftColWidth != 0 ? leftColWidth : ctx[s].PW); + ctx[s].y0 = rowi * (2 * ctx[s].BR); + // Every tile must fit inside the declared frame. This ties the (otherwise + // independent) per-tile PW/BR caps to the image dimensions, so a few header + // bytes cannot request reconstruction work far exceeding width*height + // (a decode bomb), and keeps the per-tile output rectangles disjoint. + if (ctx[s].x0 + ctx[s].PW > width || ctx[s].y0 + (2 * ctx[s].BR) > height) + ThrowRDE("ARW6: tile %u geometry (%d+%d, %d+%d) exceeds frame (%d, %d)", + s, ctx[s].x0, ctx[s].PW, ctx[s].y0, 2 * ctx[s].BR, width, + height); + } + + // Phase A: decode every tile's (up to) four independent components. + // Flattening tiles x components into one work-list lets the thread pool fill + // past the tile count (e.g. 16 units for a full frame, 4 for a single APS-C + // tile). Each unit owns a distinct comps[tile][component] slot. (No-op + // without OpenMP.) Exceptions cannot cross the OpenMP region, so they are + // funnelled through the RawImage error log and re-raised serially after each + // phase, per the rawspeed idiom. + std::vector> comps(nseg); + const auto nsegI = implicit_cast(nseg); + const int nUnits = nsegI * 4; + const int nThreads = rawspeed_get_number_of_processor_cores(); +#ifdef HAVE_OPENMP +#pragma omp parallel for schedule(dynamic) num_threads(nThreads) +#endif + for (int u = 0; u < nUnits; ++u) { + try { + comps[u / 4][u % 4] = decodeTileComponent(ctx[u / 4], u % 4); + } catch (const RawspeedException& e) { + mRaw->setError(e.what()); + } catch (...) { + // Nothing (e.g. std::bad_alloc from the per-unit allocations) may cross + // the OpenMP region boundary; funnel it like any other decode error. + mRaw->setError("ARW6: component decode failed"); + } + } + + std::string firstErr; + if (mRaw->isTooManyErrors(1, &firstErr)) + ThrowRDE("ARW6: tile component decode failed: %s", firstErr.c_str()); + + // Phase B: per tile, combine its components (luma PostFilter + colour-conv) + // and write the RGGB block into its disjoint, clipped output rectangle. +#ifdef HAVE_OPENMP +#pragma omp parallel for schedule(static) num_threads(nThreads) +#endif + for (int s = 0; s < nsegI; ++s) { + try { + finishTile(ctx[s], comps[s][COMP_YDET], comps[s][COMP_YLL], + comps[s][COMP_CB], comps[s][COMP_CR], out, width, height); + } catch (const RawspeedException& e) { + mRaw->setError(e.what()); + } catch (...) { + mRaw->setError("ARW6: tile finish failed"); + } + } + + if (mRaw->isTooManyErrors(1, &firstErr)) + ThrowRDE("ARW6: tile finish failed: %s", firstErr.c_str()); +} + +} // namespace rawspeed diff --git a/src/librawspeed/decompressors/SonyArw6Decompressor.h b/src/librawspeed/decompressors/SonyArw6Decompressor.h new file mode 100644 index 000000000..caec0c77e --- /dev/null +++ b/src/librawspeed/decompressors/SonyArw6Decompressor.h @@ -0,0 +1,51 @@ +/* + RawSpeed - RAW file decoder. + + Copyright (C) 2026 Kabir Kwatra + + This library 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 2 of the License, or (at your option) any later version. + + This library 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 this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA +*/ + +#pragma once + +#include "common/RawImage.h" +#include "decompressors/AbstractDecompressor.h" +#include "io/ByteStream.h" + +namespace rawspeed { + +// Decompressor for the Sony "ARW 6.0" format (the camera's "Compressed RAW 2" +// lossy mode, TIFF compression 32766), as used by the A7R VI (ILCE-7RM6) and +// A7 V (ILCE-7M5). +// +// The format is a wavelet codec: each spatial tile holds 3 visual components +// (Y full-res + Cb/Cr half-res), reconstructed via an inverse reversible 5/3 +// DWT (LL0 + 3 detail levels), GCLI bitplane entropy coding, a log->linear LUT, +// and a YCC->RGGB mosaic compose. See SonyArw6Decompressor.cpp for the +// pipeline. +class SonyArw6Decompressor final : public AbstractDecompressor { + RawImage mRaw; + ByteStream input; + + // Width/height of the full active CFA. + int width; + int height; + +public: + SonyArw6Decompressor(RawImage img, ByteStream input, int width, int height); + void decompress() const; +}; + +} // namespace rawspeed diff --git a/src/librawspeed/decompressors/SonyArw6LogToLinear.h b/src/librawspeed/decompressors/SonyArw6LogToLinear.h new file mode 100644 index 000000000..c41b05b39 --- /dev/null +++ b/src/librawspeed/decompressors/SonyArw6LogToLinear.h @@ -0,0 +1,409 @@ +/* + RawSpeed - RAW file decoder. + + Copyright (C) 2026 Kabir Kwatra + + This library 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 2 of the License, or (at your option) any later version. + + This library 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 this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA +*/ + +#pragma once + +#include +#include + +namespace rawspeed { + +// Sony ARW 6.0 log->linear companding table (4096 x u16). Recovered by sampling +// the decoder's output for each input index (a black-box input/output mapping), +// not transcribed from the reference. Identity for indices <= 1427, then a +// smooth log->linear expansion. Index = clamp(coeff + 2048, 0, 4095). +// LUT[1024] = 1024 (the BlackLevel). +inline constexpr std::array SonyArw6LogToLinear = {{ + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, + 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, + 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, + 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, + 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, + 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, + 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, + 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, + 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, + 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, + 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, + 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, + 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, + 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, + 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, + 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, + 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, + 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, + 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, + 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, + 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, + 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, + 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, + 253, 254, 255, 256, 257, 258, 259, 260, 261, 262, 263, + 264, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, + 275, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, + 286, 287, 288, 289, 290, 291, 292, 293, 294, 295, 296, + 297, 298, 299, 300, 301, 302, 303, 304, 305, 306, 307, + 308, 309, 310, 311, 312, 313, 314, 315, 316, 317, 318, + 319, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329, + 330, 331, 332, 333, 334, 335, 336, 337, 338, 339, 340, + 341, 342, 343, 344, 345, 346, 347, 348, 349, 350, 351, + 352, 353, 354, 355, 356, 357, 358, 359, 360, 361, 362, + 363, 364, 365, 366, 367, 368, 369, 370, 371, 372, 373, + 374, 375, 376, 377, 378, 379, 380, 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36476, 36531, 36585, 36640, 36694, 36749, 36803, 36858, 36913, + 36968, 37023, 37078, 37133, 37188, 37243, 37299, 37355, 37410, 37466, 37522, + 37578, 37633, 37689, 37746, 37802, 37859, 37915, 37972, 38028, 38085, 38141, + 38198, 38255, 38312, 38369, 38426, 38483, 38540, 38597, 38655, 38713, 38771, + 38829, 38886, 38944, 39002, +}}; + +} // namespace rawspeed From 99c7954f738c1d5faa552f3a7913462f1c2bb1a6 Mon Sep 17 00:00:00 2001 From: Kabir Kwatra Date: Fri, 26 Jun 2026 23:45:26 -0700 Subject: [PATCH 2/3] Applying clang-format --- src/librawspeed/decompressors/SonyArw6Decompressor.cpp | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/src/librawspeed/decompressors/SonyArw6Decompressor.cpp b/src/librawspeed/decompressors/SonyArw6Decompressor.cpp index 24e27cd71..eb6212b41 100644 --- a/src/librawspeed/decompressors/SonyArw6Decompressor.cpp +++ b/src/librawspeed/decompressors/SonyArw6Decompressor.cpp @@ -1343,8 +1343,8 @@ void SonyArw6Decompressor::decompress() const { if (mRaw->isTooManyErrors(1, &firstErr)) ThrowRDE("ARW6: tile component decode failed: %s", firstErr.c_str()); - // Phase B: per tile, combine its components (luma PostFilter + colour-conv) - // and write the RGGB block into its disjoint, clipped output rectangle. + // Phase B: per tile, combine its components (luma PostFilter + colour-conv) + // and write the RGGB block into its disjoint, clipped output rectangle. #ifdef HAVE_OPENMP #pragma omp parallel for schedule(static) num_threads(nThreads) #endif From 5ca4ff0c188ba59eaa7147b3ee92428759f87764 Mon Sep 17 00:00:00 2001 From: Kabir Kwatra Date: Sat, 27 Jun 2026 11:05:06 -0700 Subject: [PATCH 3/3] fix: fix overflow bug found during fuzzing MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit coefDiffDecode (SonyArw6Decompressor.cpp:383) — signed integer overflow: int32_t s = static_cast(static_cast(acc + coef[i]) & 0xffffU); The uint32_t cast was meant to give wraparound, but it's applied after acc + coef[i] is already computed in signed int. The raw coefficients from decodeCoeffs/decodeSignRev can saturate to ±0x7fffffff, so the add overflows int. The fix: Compute the sum in int64_t (can't overflow), then mask — semantics provably identical (only the low 16 bits ever mattered): int32_t s = static_cast((static_cast(acc) + coef[i]) & 0xffff); --- src/librawspeed/decompressors/SonyArw6Decompressor.cpp | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/src/librawspeed/decompressors/SonyArw6Decompressor.cpp b/src/librawspeed/decompressors/SonyArw6Decompressor.cpp index eb6212b41..7cdf8131f 100644 --- a/src/librawspeed/decompressors/SonyArw6Decompressor.cpp +++ b/src/librawspeed/decompressors/SonyArw6Decompressor.cpp @@ -379,8 +379,12 @@ void coefDiffDecode(std::vector& coef, int n) { return; int32_t acc = coef[0]; for (int i = 1; i < n; ++i) { - int32_t s = - static_cast(static_cast(acc + coef[i]) & 0xffffU); + // Cumulative sum in a wider type: the raw coefficients can saturate to + // ~INT32_MIN/MAX, so `acc + coef[i]` would overflow `int`. Only the low 16 + // bits matter (the band stores wrap to signed 16-bit), so widen, mask, then + // reinterpret as signed 16-bit. + int32_t s = static_cast((static_cast(acc) + coef[i]) & + 0xffff); if (s >= 0x8000) s -= 0x10000; coef[i] = s;