kc3-lang/libjpeg-turbo/ChangeLog.md

ChangeLog.md

Log

Author Commit Date CI Message
DRC fd8c4da0 2023-01-27T14:05:07 Bump revision to 2.1.90 to prepare for beta + acknowledge upcoming 2.1.5 release
DRC db9f297f 2023-01-27T07:10:49 ChangeLog.md: Document TurboJPEG 3 API overhaul
DRC 7ab6222c 2023-01-20T14:09:25 Merge branch 'main' into dev
DRC 98a64558 2023-01-20T13:14:11 TJBench: Set TJ*OPT_PROGRESSIVE with -progressive The documented behavior of the -progressive option is to use progressive entropy coding in JPEG images generated by compression and transform operations. However, setting TJFLAG_PROGRESSIVE was insufficient to accomplish that, because TJBench doesn't enable lossless transformation if xformOpt == 0.
DRC b99e7590 2023-01-20T10:50:21 TJBench/Java: Fix parsing of quality ranges
DRC c7c02d92 2023-01-17T18:31:31 Merge branch 'main' into dev
DRC 08cbc233 2023-01-17T11:04:38 12-bit: Set alpha channel to 4095 rather than 255
DRC d4589f4f 2023-01-14T18:07:53 Merge branch 'main' into dev
DRC 94a2b953 2023-01-11T15:01:35 tjDecompressToYUV2: Use scaled dims for plane calc The documented behavior of the function is to use decompression scaling to generate the largest possible image that will fit within the desired image dimensions. Thus, if the desired image dimensions are larger than the scaled image dimensions, then tjDecompressToYUV2() should use the scaled image dimensions when computing the plane pointers and strides to pass to tjDecompressToYUVPlanes(). Note that this bug was not previously detected, because tjunittest and tjbench always passed the scaled image dimensions to tjDecompressToYUV2().
DRC 9a146f0f 2023-01-06T10:29:10 TurboJPEG: Numerous documentation improvements - Wordsmithing, formatting, and grammar tweaks - Various clarifications and corrections, including specifying whether a particular buffer or image is used as a source or destination - Accommodate/mention features that were introduced since the API documentation was created. - For clarity, use "packed-pixel" to describe uncompressed source/destination images that are not planar YUV. - Use "row" rather than "line" to refer to a single horizontal group of pixels or component values, for consistency with the libjpeg API documentation. (libjpeg also uses "scanline", which is a more archaic term.) - Use "alignment" rather than "padding" to refer to the number of bytes by which a row's width is evenly divisible. This consistifies the documention of the YUV functions and tjLoadImage(). ("Padding" typically refers to the number of bytes added to each row, which is not the same thing.) - Remove all references to "the underlying codec." Although the TurboJPEG API originated as a cross-platform wrapper for the Intel Integrated Performance Primitives, Sun mediaLib, QuickTime, and libjpeg, none of those TurboJPEG implementations has been maintained since 2009. Nothing would prevent someone from implementing the TurboJPEG API without libjpeg-turbo, but such an implementation would not necessarily have an "underlying codec." (It could be fully self-contained.) - Use "destination image" rather than "output image", for consistency, or describe the type of image that will be output. - Avoid the term "image buffer" and instead use "byte buffer" to refer to buffers that will hold JPEG images, or describe the type of image that will be contained in the buffer. (The Java documentation doesn't use "byte buffer", because the buffer arrays literally have "byte" in front of them, and since Java doesn't have pointers, it is not possible for mere mortals to store any other type of data in those arrays.) - C: Use "unified" to describe YUV images stored in a single buffer, for consistency with the Java documentation. - Use "planar YUV" rather than "YUV planar". Is is our convention to describe images using {component layout} {colorspace/pixel format} {image function}, e.g. "packed-pixel RGB source image" or "planar YUV destination image." - C: Document the TurboJPEG API version in which a particular function or macro was introduced, and reorder the backward compatibility function stubs in turbojpeg.h alphabetically by API version. - C: Use Markdown rather than HTML tags, where possible, in the Doxygen comments.
DRC d2608583 2023-01-05T10:51:12 TurboJPEG: Ensure 'pad' arg is a power of 2 Because the PAD() macro can only handle powers of 2, this is a necessary restriction (and a documented one, except in the case of tjCompressFromYUV()-- oops.) Failing to check the 'pad' argument caused tjBufSizeYUV2() to return bogus results if 'pad' was less than 1 or otherwise not a power of 2. tjEncodeYUV3() and tjDecodeYUV() effectively treated a 'pad' value of 0 as unpadded, but that was subtle and undocumented behavior. tjCompressFromYUV() did not check whether 'pad' was a power of 2, so the strides passed to tjCompressFromYUVPlanes() would have been incorrect if 'pad' was not a power of 2. That would not have caused tjCompressFromYUV() to overrun the source buffer, as long as the calling application allocated the buffer based on the return value of tjBufSizeYUV2() (which computes the strides in the same manner as tjCompressFromYUV().) However, if the calling application attempted to initialize the source buffer using correctly-computed strides, then it could have overrun its own buffer in certain cases or produced incorrect JPEG images in others. Realistically, there is no reason why an application would want to pass a non-power-of-2 'pad' value to a TurboJPEG API function, so this commit is about user-proofing the API rather than fixing any known issue.
DRC 2241434e 2022-12-15T12:20:50 16-bit lossless JPEG support
DRC 80352340 2022-12-07T14:11:37 Merge branch 'main' into dev
DRC dc4a93fa 2022-12-07T13:37:16 jpegtran: Fix FPE w/ -drop & -trim on corrupt JPEG requant_comp() in transupp.c, a function that supports the jpegtran -drop option, borrows code from the C quantization function in order to re-quantize the coefficients from the dropped image. However, the function does not guard against the possibility that a corrupt source image could inject quantization table values equal to 0, thus causing a divide-by-zero error. Since this error affected only jpegtran and not any of the libraries (the tjTransform() function in the TurboJPEG API does not expose the image drop feature), it did not represent a security risk. In fact, this commit does not change the output of jpegtran when attempting to transform the aforementioned corrupt source image. It merely eliminates the floating point exception. Like most issues of this type, however, eliminating the error prevents it from hiding legitimate security issues that may later be introduced. Fixes #635 Fixes #636
DRC 5da86f74 2022-12-07T09:45:33 ChangeLog.md: List CVE ID fixed by 9120a247
DRC 7bb5cb56 2022-12-07T09:39:03 ChangeLog.md: List CVE ID fixed by f35fd27e
DRC e7a248eb 2022-11-29T01:08:27 Merge branch 'main' into dev
DRC 45cd2ded 2022-11-28T21:02:42 12-bit: Prevent RGB-to-YCC table overrun/underrun cjpeg relies on the various file I/O modules to range-limit the input samples, but no range limiting is performed by the jpeg_write_scanlines() function itself. With 8-bit samples, that isn't a problem, because sample values > MAXJSAMPLE will overflow the data type and wrap around to 0. With 12-bit samples, however, it is possible to pass sample values < 0 or > 4095 to jpeg_write_scanlines(), which would cause the RGB-to-YCbCr color converter to underflow or overflow the RGB-to-YCbCr conversion tables. That issue has existed in libjpeg all along. This commit mitigates the issue by masking off all but the lowest 12 bits of each 12-bit input sample prior to using the input sample value to index the RGB-to-YCbCr conversion tables. Fixes #633
DRC 98ff1fd1 2022-11-21T20:57:39 TurboJPEG: Add lossless JPEG detection capability Add a new TurboJPEG C API function (tjDecompressHeader4()) and Java API method (TJDecompressor.getFlags()) that return the bitwise OR of any flags that are relevant to the JPEG image being decompressed (currently TJFLAG_PROGRESSIVE, TJFLAG_ARITHMETIC, TJFLAG_LOSSLESS, and their Java equivalents.) This allows a calling program to determine whether the image being decompressed is a lossless JPEG image, which means that the decompression scaling feature will not be available and that a full-sized destination buffer should be allocated. More specifically, this fixes a buffer overrun in TJBench, TJExample, and the decompress* fuzz targets that occurred when attempting (in vain) to decompress a lossless JPEG image with decompression scaling enabled.
DRC 25ccad99 2022-11-16T15:57:25 TurboJPEG: 8-bit lossless JPEG support
DRC 6002720c 2022-11-15T23:10:35 TurboJPEG: Opt. enable arithmetic entropy coding
DRC ed73fdc9 2022-11-15T21:28:01 Merge branch 'main' into dev
DRC 78a36f6d 2022-11-15T17:01:17 Fix buffer overrun in 12-bit prog Huffman encoder Regression introduced by 16bd984557fa2c490be0b9665e2ea0d4274528a8 and 5b177b3cab5cfb661256c1e74df160158ec6c34e The pre-computed absolute values used in encode_mcu_AC_first() and encode_mcu_AC_refine() were stored in a JCOEF (signed short) array. When attempting to losslessly transform a specially-crafted malformed 12-bit JPEG image with a coefficient value of -32768 into a progressive 12-bit JPEG image, the progressive Huffman encoder attempted to store the absolute value of -32768 in the JCOEF array, thus overflowing the 16-bit signed data type. Therefore, at this point in the code: https://github.com/libjpeg-turbo/libjpeg-turbo/blob/8c5e78ce292c1642057102eac42f12ab57964293/jcphuff.c#L889 the absolute value was read as -32768, which caused the test at https://github.com/libjpeg-turbo/libjpeg-turbo/blob/8c5e78ce292c1642057102eac42f12ab57964293/jcphuff.c#L896 to fail, falling through to https://github.com/libjpeg-turbo/libjpeg-turbo/blob/8c5e78ce292c1642057102eac42f12ab57964293/jcphuff.c#L908 with an overly large value of r (46) that, when shifted left four places, incremented, and passed to emit_symbol(), exceeded the maximum index (255) for the derived code tables. Fortunately, the buffer overrun was fully contained within phuff_entropy_encoder, so the issue did not generate a segfault or other user-visible errant behavior, but it did cause a UBSan failure that was detected by OSS-Fuzz. This commit introduces an unsigned JCOEF (UJCOEF) data type and uses it to store the absolute values of DCT coefficients computed by the AC_first_prepare() and AC_refine_prepare() methods. Note that the changes to the Arm Neon progressive Huffman encoder extensions cause signed 16-bit instructions to be replaced with equivalent unsigned 16-bit instructions, so the changes should be performance-neutral. Based on: https://github.com/mayeut/libjpeg-turbo/commit/bbf61c0382c4f8bd1f1cfc666467581496c2fb7c Closes #628
DRC 1926ab41 2022-11-14T16:31:41 ChangeLog.md: Multi-precision feature wordsmithing - Because of b5a9ef64ea299423b7fb46c47f4a70697a442dd4, "by default" is no longer applicable. (12-bit-per-component JPEG support is now part of the core libjpeg-turbo functionality and cannot be disabled.) - Change awkward "can be used to enable the creation of" to less awkward "can be used to create".
DRC 97772cba 2022-11-14T15:36:25 Merge branch 'ijg.lossless' into dev Refer to #402
DRC b5a9ef64 2022-11-13T13:00:26 Don't allow 12-bit JPEG support to be disabled In libjpeg-turbo 2.1.x and prior, the WITH_12BIT CMake variable was used to enable 12-bit JPEG support at compile time, because the libjpeg API library could not handle multiple JPEG data precisions at run time. The initial approach to handling multiple JPEG data precisions at run time (7fec5074f962b20ed00b4f5da4533e1e8d4ed8ac) created a whole new API, library, and applications for 12-bit data precision, so it made sense to repurpose WITH_12BIT to allow 12-bit data precision to be disabled. e8b40f3c2ba187ba95c13c3e8ce21c8534256df7 made it so that the libjpeg API library can handle multiple JPEG data precisions at run time via a handful of straightforward API extensions. Referring to 6c2bc901e27b047440ed46920c4d3f0480b48268, it hasn't been possible to build libjpeg-turbo with both forward and backward libjpeg API/ABI compatibility since libjpeg-turbo 1.4.x. Thus, whereas we retain full backward API/ABI compatibility with libjpeg v6b-v8, forward libjpeg API/ABI compatibility ceased being realistic years ago, so it no longer makes sense to provide compile-time options that give a false sense of forward API/ABI compatibility by allowing some (but not all) of our libjpeg API extensions to be disabled. Such options are difficult to maintain and clutter the code with #ifdefs.
DRC e8b40f3c 2022-11-01T21:45:39 Vastly improve 12-bit JPEG integration The Gordian knot that 7fec5074f962b20ed00b4f5da4533e1e8d4ed8ac attempted to unravel was caused by the fact that there are several data-precision-dependent (JSAMPLE-dependent) fields and methods in the exposed libjpeg API structures, and if you change the exposed libjpeg API structures, then you have to change the whole API. If you change the whole API, then you have to provide a whole new library to support the new API, and that makes it difficult to support multiple data precisions in the same application. (It is not impossible, as example.c demonstrated, but using data-precision-dependent libjpeg API structures would have made the cjpeg, djpeg, and jpegtran source code hard to read, so it made more sense to build, install, and package 12-bit-specific versions of those applications.) Unfortunately, the result of that initial integration effort was an unreadable and unmaintainable mess, which is a problem for a library that is an ISO/ITU-T reference implementation. Also, as I dug into the problem of lossless JPEG support, I realized that 16-bit lossless JPEG images are a thing, and supporting yet another version of the libjpeg API just for those images is untenable. In fact, however, the touch points for JSAMPLE in the exposed libjpeg API structures are minimal: - The colormap and sample_range_limit fields in jpeg_decompress_struct - The alloc_sarray() and access_virt_sarray() methods in jpeg_memory_mgr - jpeg_write_scanlines() and jpeg_write_raw_data() - jpeg_read_scanlines() and jpeg_read_raw_data() - jpeg_skip_scanlines() and jpeg_crop_scanline() (This is subtle, but both of those functions use JSAMPLE-dependent opaque structures behind the scenes.) It is much more readable and maintainable to provide 12-bit-specific versions of those six top-level API functions and to document that the aforementioned methods and fields must be type-cast when using 12-bit samples. Since that eliminates the need to provide a 12-bit-specific version of the exposed libjpeg API structures, we can: - Compile only the precision-dependent libjpeg modules (the coefficient buffer controllers, the colorspace converters, the DCT/IDCT managers, the main buffer controllers, the preprocessing and postprocessing controller, the downsampler and upsamplers, the quantizers, the integer DCT methods, and the IDCT methods) for multiple data precisions. - Introduce 12-bit-specific methods into the various internal structures defined in jpegint.h. - Create precision-independent data type, macro, method, field, and function names that are prefixed by an underscore, and use an internal header to convert those into precision-dependent data type, macro, method, field, and function names, based on the value of BITS_IN_JSAMPLE, when compiling the precision-dependent libjpeg modules. - Expose precision-dependent jinit*() functions for each of the precision-dependent libjpeg modules. - Abstract the precision-dependent libjpeg modules by calling the appropriate precision-dependent jinit*() function, based on the value of cinfo->data_precision, from top-level libjpeg API functions.
DRC 664b64a9 2022-11-03T14:25:35 Merge branch 'main' into dev
DRC 4f7a8afb 2022-11-03T13:37:55 Build: Fix issues w/ Ninja Multi-Config generator - Fix an issue whereby a build with ENABLE_SHARED=0 could not be installed when using the Ninja Multi-Config CMake generator. - Fix an issue whereby a Windows installer could not be built when using the Ninja Multi-Config CMake generator. - Fix an issue whereby the Java regression tests failed when using the Ninja Multi-Config CMake generator. Based on: https://github.com/stilllman/libjpeg-turbo/commit/4f169deeb092a0513472b04f05f57bfe42b31ceb Closes #626
DRC 8917c548 2022-11-03T14:20:22 ChangeLog.md: Add colons to sub-headers For some reason, I failed to add a colon to the "Significant changes relative to 2.1 beta1" sub-header, and the mistake propagated from there.
DRC 513f9e66 2022-08-09T04:27:33 Merge branch 'main' into dev
DRC 8162eddf 2022-08-08T16:02:34 Fix issues w/ partial img decompr + buf img mode Fixes #611
DRC 931884e7 2022-08-08T15:41:01 Java: Remove deprecated fields, ctors, and methods Most of these have been deprecated since libjpeg-turbo 1.4.x. It's time.
DRC 280784f7 2022-08-08T15:07:45 Merge branch 'main' into dev
DRC 2e136a71 2022-08-08T14:17:51 Re-fix buf img mode decompr err w/short prog JPEGs This commit reverts 4dbc293125b417f97e5b1ca9e7260c82ff199a06 and 9f8f683e745972720433406cff4b31e95bd6a33e (the previous two commits) and fixes #613 the correct way. The crux of the issue wasn't the size of the whole_image virtual array but rather that, since last_iMCU_row is unsigned, (last_iMCU_row - 1) wrapped around to 0xFFFFFFFF when last_iMCU_row was 0. This caused the interblock smoothing algorithm introduced in 6d91e950c871103a11bac2f10c63bf998796c719 to erroneously try to access the next two iMCU rows, neither of which existed. The first attempt at a fix (4dbc293125b417f97e5b1ca9e7260c82ff199a06) exposed a NULL dereference, detected by OSS-Fuzz, that occurred when attempting to decompress a specially-crafted malformed JPEG image to a YUV buffer using tjDecompressToYUV*() with 1/4 IDCT scaling. Fixes #613 (again) Also fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=49898
DRC 9a60181b 2022-08-07T13:48:31 Merge branch 'main' into dev
DRC 4dbc2931 2022-08-07T09:24:57 Fix buf image mode decompr err w/ short prog JPEGs Regression introduced by 6d91e950c871103a11bac2f10c63bf998796c719 Because we're now using a 5x5 smoothing window when decompressing progressive JPEG images, we need to ensure that the whole_image virtual array contains at least five rows. Previously that was not always the case unless the progressive JPEG image being decompressed had at least five iMCU rows. Since an iMCU has a height of (8 * the vertical sampling factor), attempting to decompress 4:2:2 and 4:4:4 images <= 32 pixels in height or 4:2:0 images <= 64 pixels in height triggered a JERR_BAD_VIRTUAL_ACCESS error in decompress_smooth_data(), because access_rows exceeded the number of rows in the virtual array. Fixes #613
DRC fc224c48 2022-07-07T13:11:05 Merge branch 'main' into dev
Donovan Watteau 59337a67 2022-07-06T12:11:50 PowerPC: Detect AltiVec support on OS X libjpeg-turbo's AltiVec SIMD extensions previously assumed that AltiVec instructions were available on all Power Macs that supported OS X 10.4 "Tiger" (the earliest version of OS X that libjpeg-turbo has ever supported), but Tiger can actually run on PowerPC G3 processors, which lack AltiVec instructions. This commit enables run-time detection of AltiVec instructions on OS X/PowerPC systems if AltiVec instructions are not force-enabled at compile time (using -maltivec). This allows the same build of libjpeg-turbo to support G3, G4, and G5 Power Macs. Closes #609
DRC aa5a3599 2022-06-24T14:21:33 Merge branch 'main' into dev
DRC ba22c0f7 2022-06-24T14:03:03 tjDecompressHeader3(): Accept tables-only streams Inspired by: https://github.com/amyspark/libjpeg-turbo/commit/b3b15cfe74cf07914122e26cf1e408a9a9cf3135 Closes #604 Closes #605
DRC faa7c74a 2022-05-31T13:07:00 ChangeLog.md: Acknowledge 2.1.4 release
Felix Hanau aadd60ae 2022-05-25T19:51:52 Speed up computation of optimal Huffman tables Closes #602
DRC 263386c2 2022-03-11T17:35:59 Merge branch 'main' into dev
DRC a0148454 2022-03-11T10:50:47 Win: Fix build with Visual Studio 2010 (broken by 607b668ff96e40fdc749de9b1bb98e7f40c86d93) - Visual Studio 2010 apparently doesn't have the snprintf() inline function, so restore the macro that emulates that function using _snprintf_s(). - Explicitly include errno.h in strtest.c, since jinclude.h doesn't include it when building with Visual Studio.
DRC 7fec5074 2022-03-08T12:34:11 Support 8-bit & 12-bit JPEGs using the same build Partially implements #199 This commit also implements a request from #178 (the ability to compile the libjpeg example as a standalone program.)
DRC 6d2d6d3b 2022-02-11T09:34:01 "YASM" = "Yasm" The assembler name was initially spelled "YASM", but it has been "Yasm" for the entirety of libjpeg-turbo's existence.
DRC d7d16df6 2022-02-01T09:11:19 Fix segv w/ h2v2 merged upsamp, jpeg_crop_scanline The h2v2 (4:2:0) merged upsampler uses a spare row buffer so that it can upsample two rows at a time but return only one row to the application, if necessary. merged_2v_upsample() copies from this spare row buffer into the application-supplied output buffer, using the out_row_width field in the my_merged_upsampler struct to determine how many samples to copy. out_row_width is set in jinit_merged_upsampler(), which is called within the body of jpeg_start_decompress(). Since jpeg_crop_scanline() must be called after jpeg_start_decompress(), jpeg_crop_scanline() must modify the value of out_row_width if the h2v2 merged upsampler will be used. Otherwise, merged_2v_upsample() can overflow the output buffer if the number of bytes between the current output buffer position and the end of the buffer is less than the number of bytes required to represent an uncropped scanline of the output image. All of the destination managers used by djpeg allocate either a whole image buffer or a scanline buffer based on the uncropped output image width, so this issue is not reproducible using djpeg. Fixes #574
DRC 57ba02a4 2021-10-01T16:28:54 Build: Improve Neon capability detection - Use check_c_source_compiles() rather than check_symbol_exists() to detect the presence of vld1_s16_x3(), vld1_u16_x2(), and vld1q_u8_x4(). check_symbol_exists() is unreliable for detecting intrinsics, and in practice, it did not detect the presence of the aforementioned intrinsics in versions of GCC that support them. - Set DEFAULT_NEON_INTRINSICS=0 for GCC < 12, even if the aforementioned intrinsics are available. The AArch64 back end in GCC 10 and 11 supports the necessary intrinsics, but the GAS implementation is still faster when using those compilers. Fixes #547
DRC 73eff6ef 2021-11-30T15:06:54 cjpeg: auto. compr. gray BMP/GIF-->grayscale JPEG aa7459050d7a50e1d8a99488902d41fbc118a50f was supposed to enable this for BMP input images but didn't, due to a similar oversight to the one fixed in the previous commit.
DRC 2ce32e0f 2021-11-30T10:54:24 cjpeg: automatically compress PGM-->grayscale JPEG (regression introduced by aa7459050d7a50e1d8a99488902d41fbc118a50f) cjpeg sets cinfo.in_color_space to JCS_RGB as an "arbitrary guess." Since tjLoadImage() never uses JCS_RGB, the PGM reader should treat JCS_RGB the same as JCS_UNKNOWN. Fixes #566
DRC ecf021bc 2021-11-18T21:04:35 cjpeg: Add -strict arg to treat warnings as fatal This adds fault tolerance to the LZW-compressed GIF reader, which is the only compression-side code that can throw warnings.
Piotr Kubaj d401d625 2021-10-27T03:39:09 PowerPC: Detect AltiVec support on FreeBSD Recent FreeBSD/PowerPC compilers, such as Clang 11.0.x on FreeBSD 13, do the equivalent of passing -maltivec to the compiler by default, so run-time AltiVec detection is unnecessary. However, it becomes necessary when using other compilers or when passing -mno-altivec to the compiler. Closes #552
DRC a9c41fbc 2021-10-03T12:43:15 Build: Don't enable Neon SIMD exts with Armv6- When building for 32-bit Arm platforms, test whether basic Neon intrinsics will compile with the specified compiler and C flags. This prevents the build system from enabling the Neon SIMD extensions when targetting Armv6 and other legacy architectures that do not support Neon instructions. Regression introduced by bbd8089297862efb6c39a22b5623f04567ff6443. (Checking whether gas-preprocessor.pl was needed for 32-bit Arm builds had the effect of checking whether Neon instructions were supported.) Fixes #553
DRC 739ecbc5 2021-09-30T16:28:51 ChangeLog.md: List CVE ID fixed by 2849d86a
DRC 173900b1 2021-09-02T12:48:50 tjTrans: Allow 8x8 crop alignmnt w/odd 4:4:4 JPEGs Fixes #549
DRC 5d2430f4 2021-09-02T13:17:32 ChangeLog.md: Add missing sub-header for 2.1.2
DRC 129f0cb7 2021-08-25T12:07:58 Neon/AArch64: Don't put GAS functions in .rodata Regression introduced by 240ba417aa4b3174850d05ea0d22dbe5f80553c1 Closes #546
DRC 2849d86a 2021-08-06T13:41:15 SSE2/64-bit: Fix trans. segfault w/ malformed JPEG Attempting to losslessly transform certain malformed JPEG images can cause the nbits table index in the Huffman encoder to exceed 32768, so we need to pad the SSE2 implementation of that table to 65536 entries as we do with the C implementation. Regression introduced by 087c29e07f7533ec82fd7eb1dafc84c29e7870ec Fixes #543
Alex Richardson a72816ed 2021-07-16T09:37:06 Use uintptr_t, if avail, for pointer-to-int casts Although sizeof(void *) == sizeof(size_t) for all architectures that are currently supported by libjpeg-turbo, such is not guaranteed by the C standard. Specifically, CHERI-enabled architectures (e.g. CHERI-RISC-V or Arm's Morello) use capability pointers that are twice the size of size_t (128 bits for Morello and RV64), so casting to size_t strips the upper bits of the pointer (including the validity bit) and makes it non-deferenceable, as indicated by the following compiler warning: warning: cast from provenance-free integer type to pointer type will give pointer that can not be dereferenced [-Werror,-Wcheri-capability-misuse] cvalue = values = (JCOEF *)PAD((size_t)values_unaligned, 16); Ignoring this warning results in a run-time crash. Casting pointers to uintptr_t, if it is available, avoids this problem, since uintptr_t is defined as an unsigned integer type that can hold a pointer value. Since C89 compatibility is still necessary in libjpeg-turbo, this commit introduces a new typedef for pointer-to-integer casts that uses a GNU-specific extension available in GCC 4.6+ and Clang 3.0+ and falls back to using size_t if the extension is unavailable. The only other options would require C99 or Clang-specific builtins. Closes #538
DRC 4d9f256b 2021-07-13T11:52:49 jpegtran: Add option to copy only ICC markers Closes #533
DRC 2a2970af 2021-07-09T15:35:56 Neon/AArch32: Work around Clang T32 miscompilation Referring to the C standard (http://www.open-std.org/jtc1/sc22/WG14/www/docs/n1256.pdf, J.2 Undefined behavior), the behavior of the compiler is undefined if "conversion between two pointer types produces a result that is incorrectly aligned." Thus, the behavior of this code *((uint32_t *)buffer) = BUILTIN_BSWAP32(put_buffer); in the AArch32 version of the FLUSH() macro is undefined unless 'buffer' is 32-bit-aligned. Referring to https://bugs.llvm.org/show_bug.cgi?id=50785, certain versions of Clang, when generating Thumb (T32) instructions, miscompile that code into an assembly instruction (stm) that requires the destination to be 32-bit-aligned. Since such alignment cannot be guaranteed within the Huffman encoder, this reportedly led to crashes (SIGBUS: illegal alignment) with AArch32/Thumb builds of libjpeg-turbo running on Android devices, although thus far I have been unable to reproduce those crashes with a plain Linux/Arm system. The miscompilation is visible with the Compiler Explorer: https://godbolt.org/z/rv1ccx1Pb However, it goes away when removing the return statement from the function. Thus, it seems that Clang's behavior in this regard is somewhat variable, which may explain why the crashes are only reproducible on certain platforms. The suggested workaround is to use memcpy(), but whereas Clang and recent GCC releases are smart enough to compile a 4-byte memcpy() call into a str instruction, GCC < 6 is not. Referring to https://godbolt.org/z/ae7Wje3P6, the only way to consistently produce the desired str instruction across all supported compilers is to use inline assembly. Visual C++ presumably does not miscompile the code in question, since no issues have been reported with it, but since the code relies on undefined compiler behavior, prudence dictates that e4ec23d7ae051c1c73947f889818900362fdc52d should be reverted for Visual C++, which this commit does. The performance impact of e4ec23d7ae051c1c73947f889818900362fdc52d for Visual C++/Arm builds is unknown (I have no ability to test such builds), but regardless, this commit reverts the Visual C++/Arm performance to that of libjpeg-turbo 2.1 beta1. Closes #529
DRC 0081c2de 2021-07-07T10:12:46 Neon/AArch32: Fix build if 'soft' float ABI used Arm compilers have three floating point ABI options: 'soft' compiles floating point operations as function calls into a software floating point library, which emulates floating point operations using integer operations. Floating point function arguments are passed using integer registers. 'softfp' also compiles floating point operations as function calls into a floating point library and passes floating point function arguments using integer registers, but the floating point library functions can use FPU instructions if the CPU supports them. 'hard' compiles floating point operations into inline FPU instructions, similarly to x86 and other architectures, and passes floating point function arguments using FPU registers. Not all AArch32 CPUs have FPUs or support Neon instructions, so on Linux and Android platforms, the AArch32 SIMD dispatcher in libjpeg-turbo only enables the Neon SIMD extensions at run time if /proc/cpuinfo indicates that the CPU supports Neon instructions or if Neon instructions are explicitly enabled (e.g. by passing -mfpu=neon to the compiler.) In order to support all AArch32 CPUs using the same code base, i.e. to support run-time FPU and Neon auto-detection, it is necessary to compile the scalar C source code using -mfloat-abi=soft. However, the 'soft' floating point ABI cannot be used when compiling Neon intrinsics, so the intrinsics implementation of the Neon SIMD extensions must be compiled using -mfloat-abi=softfp if the scalar C source code is compiled using -mfloat-abi=soft. This commit modifies the build system so that it detects whether -mfloat-abi=softfp must be explicitly added to the compiler flags when building the intrinsics implementation of the Neon SIMD extensions. This will be necessary if the build is using the 'soft' floating point ABI along with run-time auto-detection of Neon instructions. Fixes #523
DRC 1a1fb615 2021-06-18T09:46:03 ChangeLog.md: List CVE ID fixed by c76f4a08 Referring to #527, the security community did not assign this CVE ID until more than 8 months after the fix for the issue was released. By the time they assigned the ID, libjpeg-turbo already had two production releases containing the fix. This calls into question the usefulness of assigning a CVE ID to the issue, particularly given that the buffer overrun in question was fully contained in the stack, not detectable with valgrind, and confined to lossless transformation (it did not affect JPEG compression or decompression.) https://vuldb.com/?id.176175 says that "the exploitability is told to be easy" but provides no clarification, and given that the author of that page does not seem to be aware that a fix for the issue has been available since early December of 2019, it calls into question the accuracy of everything else on the page. It would really be nice if the security community approached me about these things before wasting my time, but I guess it's my lot in life to modify a change log entry from 2019 to include a CVE ID from 2020. So it goes...
DRC 3932190c 2021-05-17T13:05:16 Fix build w/ non-GCC-compatible Un*x/Arm compilers Regression introduced by d2c407995992be1f128704ae2479adfd7906c158 Closes #519
DRC 4f51f36e 2021-04-23T11:42:40 Bump version to 2.1.0 to prepare for final release
DRC e0606daf 2021-04-21T14:49:06 TurboJPEG: Update JPEG buf ptrs on comp/xform err When using the in-memory destination manager, it is necessary to explicitly call the destination manager's term_destination() method if an error occurs. That method is called by jpeg_finish_compress() but not by jpeg_abort_compress(). This fixes a potential double free() that could occur if tjCompress*() or tjTransform() returned an error and the calling application tried to clean up a JPEG buffer that was dynamically re-allocated by one of those functions.
DRC f35fd27e 2021-04-06T12:51:03 tjLoadImage: Fix issues w/loading 16-bit PPMs/PGMs - The PPM reader now throws an error rather than segfaulting (due to a buffer overrun) if an application attempts to load a 16-bit PPM file into a grayscale uncompressed image buffer. No known applications allowed that (not even the test applications in libjpeg-turbo), because that mode of operation was never expected to work and did not work under any circumstances. (In fact, it was necessary to modify TJBench in order to reproduce the issue outside of a fuzzing environment.) This was purely a matter of making the library bow out gracefully rather than crash if an application tries to do something really stupid. - The PPM reader now throws an error rather than generating incorrect pixels if an application attempts to load a 16-bit PGM file into an RGB uncompressed image buffer. - The PPM reader now correctly loads 16-bit PPM files into extended RGB uncompressed image buffers. (Previously it generated incorrect pixels unless the input colorspace was JCS_RGB or JCS_EXT_RGB.) The only way that users could have potentially encountered these issues was through the tjLoadImage() function. cjpeg and TJBench were unaffected.
DRC c81e91e8 2021-04-05T16:08:22 TurboJPEG: New flag for limiting prog JPEG scans This also fixes timeouts reported by OSS-Fuzz.
DRC e795afc3 2021-03-25T22:36:15 SSE2: Fix prog Huff enc err if Sl%32==0 && Al!=0 (regression introduced by 16bd984557fa2c490be0b9665e2ea0d4274528a8) This implements the same fix for jsimd_encode_mcu_AC_refine_prepare_sse2() that a81a8c137b3f1c65082aa61f236aa88af61b3ad4 implemented for jsimd_encode_mcu_AC_first_prepare_sse2(). Based on: https://github.com/MegaByte/libjpeg-turbo/commit/1a59587397150c9ef9dffc5813cb3891db4bc0c8 https://github.com/MegaByte/libjpeg-turbo/commit/eb176a91d87a470bf8c987be786668aa944dd1dd Fixes #509 Closes #510
DRC ed70101d 2021-03-15T12:36:55 ChangeLog.md: List CVE ID fixed by 1719d12e Referring to https://bugzilla.redhat.com/show_bug.cgi?id=1937385#c2, it is my opinion that the severity of this bug was grossly overstated and that a CVE never should have been assigned to it, but since one was assigned, users need to know which version of libjpeg-turbo contains the fix. Dear security community, please learn what "DoS" actually means and stop misusing that term for dramatic effect. Thanks.
DRC 1719d12e 2021-01-14T18:35:15 cjpeg: Fix FPE when compressing 0-width GIF Fixes #493
Richard Townsend 74e6ea45 2021-01-05T20:23:11 Neon: Fix Huffman enc. error w/Visual Studio+Clang The GNU builtin function __builtin_clzl() accepts an unsigned long argument, which is 8 bytes wide on LP64 systems (most Un*x systems, including Mac) but 4 bytes wide on LLP64 systems (Windows.) This caused the Neon intrinsics implementation of Huffman encoding to produce mathematically incorrect results when compiled using Visual Studio with Clang. This commit changes all invocations of __builtin_clzl() in the Neon SIMD extensions to __builtin_clzll(), which accepts an unsigned long long argument that is guaranteed to be 8 bytes wide on all systems. Fixes #480 Closes #490
DRC c7ca521b 2020-11-28T06:38:27 Fix uninitialized read in decompress_smooth_data() Regression introduced by 42825b68d570fb07fe820ac62ad91017e61e9a25 Referring to the discussion in #459, the OSS-Fuzz test case https://github.com/libjpeg-turbo/libjpeg-turbo/files/5597075/clusterfuzz-testcase-minimized-pngsave_buffer_fuzzer-5728375846731776.txt created a situation in which cinfo->output_iMCU_row > cinfo->master->last_good_iMCU_row but cinfo->input_scan_number == 1 thus causing decompress_smooth_data() to read from prev_coef_bits_latch[], which was uninitialized. I was unable to create the same situation with a real JPEG image.
DRC ccaba5d7 2020-11-25T14:55:55 Fix buffer overrun with certain narrow prog JPEGs Regression introduced by 6d91e950c871103a11bac2f10c63bf998796c719 last_block_column in decompress_smooth_data() can be 0 if, for instance, decompressing a 4:4:4 image of width 8 or less or a 4:2:2 or 4:2:0 image of width 16 or less. Since last_block_column is an unsigned int, subtracting 1 from it produced 0xFFFFFFFF, the test in line 590 passed, and we attempted to access blocks from a second block column that didn't actually exist. Closes #476
DRC 8cf6f716 2020-11-24T21:32:48 Bump revision to 2.0.90 to prepare for beta
Jonathan Wright eb14189c 2020-11-17T12:48:49 Fix Neon SIMD build issues with Visual Studio - Use the _M_ARM and _M_ARM64 macros provided by Visual Studio for compile-time detection of Arm builds, since __arm__ and __aarch64__ are only present in GNU-compatible compilers. - Neon/intrinsics: Use the _CountLeadingZeros() and _CountLeadingZeros64() intrinsics provided by Visual Studio, since __builtin_clz() and __builtin_clzl() are only present in GNU-compatible compilers. - Neon/intrinsics: Since Visual Studio does not support static vector initialization, replace static initialization of Neon vectors with the appropriate intrinsics. Compared to the static initialization approach, this produces identical assembly code with both GCC and Clang. - Neon/intrinsics: Since Visual Studio does not support inline assembly code, provide alternative code paths for Visual Studio whenever inline assembly is used. - Build: Set FLOATTEST appropriately for AArch64 Visual Studio builds (Visual Studio does not emit fused multiply-add [FMA] instructions by default for such builds.) - Neon/intrinsics: Move temporary buffer allocation outside of nested loops. Since Visual Studio configures Arm builds with a relatively small amount of stack memory, attempting to allocate those buffers within the inner loops caused a stack overflow. Closes #461 Closes #475
DRC 91dd3b23 2020-11-24T19:22:38 ChangeLog: macOS Armv8/x86-64 univ. binary support
DRC 6d91e950 2020-10-05T13:37:44 Use 5x5 win & 9 AC coeffs when smoothing DC scans ... of progressive images. Based on: https://github.com/mo271/libjpeg-turbo/commit/be8d36d13b79a472e56da0717ba067e6139bc0e1 https://github.com/mo271/libjpeg-turbo/commit/9d528f278ee3a5ba571c0b9ec4567c557614fb25 https://github.com/mo271/libjpeg-turbo/commit/85f36f0765ea2c28909fc4c0e570cd68d3a1ed85 https://github.com/mo271/libjpeg-turbo/commit/63a4d39e387f61bcb83b393838f436b410b97308 https://github.com/mo271/libjpeg-turbo/commit/51336a6ad5acb9379dc8e3e5e5758fd439224b7c Closes #459 Closes #474
DRC 8f830598 2020-11-13T15:21:26 Merge branch 'master' into dev
DRC 3e9e7c70 2020-11-11T17:54:06 Fix build if WITH_12BIT==1 && WITH_JPEG(7|8)==1 Fixes #466
DRC bbd80892 2020-11-10T17:54:14 Neon: Finalize intrinsics implementation - Remove gas-preprocessor.pl. None of the compilers that can build the new intrinsics implementation require gas-preprocessor.pl (tested with Xcode and with Clang 3.9+ for Linux.) - Document that Xcode 6.3.x or later is now required for iOS builds (older versions of Xcode do not have a full set of Neon intrinsics.) - Add a change log entry. - Do not enable the ASM CMake language unless NEON_INTRINSICS is false. - Add a Clang/Arm64 test to .travis.yml in order to test the new intrinsics implementation. Closes #455
Jonathan Wright 240ba417 2020-01-07T16:40:32 Neon: Intrinsics impl. of prog. Huffman encoding The previous AArch64 GAS implementation has been removed, since the intrinsics implementation provides the same or better performance. There was no previous AArch32 GAS implementation.
DRC 7c1a1789 2020-11-05T16:04:55 Merge branch 'master' into dev
DRC 6e632af9 2020-11-04T10:13:06 Demote "fast" [I]DCT algorithms to legacy status - Refer to the "slow" [I]DCT algorithms as "accurate" instead, since they are not slow under libjpeg-turbo. - Adjust documentation claims to reflect the fact that the "slow" and "fast" algorithms produce about the same performance on AVX2-equipped CPUs (because of the dual-lane nature of AVX2, it was not possible to accelerate the "fast" algorithm beyond what was achievable with SSE2.) Also adjust the claims to reflect the fact that the "fast" algorithm tends to be ~5-15% faster than the "slow" algorithm on non-AVX2-equipped CPUs, regardless of the use of the libjpeg-turbo SIMD extensions. - Indicate the legacy status of the "fast" and float algorithms in the documentation and cjpeg/djpeg usage info. - Remove obsolete paragraph in the djpeg man page that suggested that the float algorithm could be faster than the "fast" algorithm on some CPUs.
DRC 88ae6098 2020-10-27T13:28:56 Merge branch 'ijg' into dev - Restore GIF read/compressed GIF write support from jpeg-6a and jpeg-9d. - Integrate jpegtran -wipe and -drop options from jpeg-9a and jpeg-9d. - Integrate jpegtran -crop extension (for expanding the image size) from jpeg-9a and jpeg-9d. - Integrate other minor code tweaks from jpeg-9*
DRC 59352195 2020-10-19T21:17:46 Merge branch 'master' into dev
DRC 1ed312ea 2020-10-15T17:47:31 "ARM"="Arm", "NEON"="Neon" Refer to: https://www.arm.com/company/policies/trademarks/arm-trademark-list/arm-trademark https://www.arm.com/company/policies/trademarks/arm-trademark-list/neon-trademark NOTE: These changes are only applied to change log entries for 2.0.x and later, since the change log is a historical record and Arm's new trademark policy did not go into effect until late 2017.
DRC b8200c66 2019-03-08T11:57:54 Build: Add CMake package config files Based on: https://github.com/hjmallon/libjpeg-turbo/commit/d34b89b41134bd2b581e222514ee493594193d87 Closes #339 Closes #342
DRC 460dfe40 2020-10-14T14:46:30 ChangeLog: Acknowledge 2.0.6 release
DRC ae08115d 2020-10-15T10:25:46 Merge branch 'master' into dev
DRC 190382b7 2020-10-14T15:14:26 ChangeLog: Fix minor formatting issue
DRC 8789a5e2 2020-10-01T21:27:47 Merge branch 'master' into dev
DRC 89c88c25 2020-10-01T21:24:27 ChangeLog.md: jpeg_crop_scanline(), not scanlines
DRC 2ec4a5eb 2020-10-01T19:18:44 Fix dec artifacts w/cropped+smoothed prog DC scans This commit modifies decompress_smooth_data(), adding missing MCU column offsets to the prev_block_row and next_block_row indices that are used for block rows other than the first and last. Effectively, this eliminates unexpected visual artifacts when using jpeg_crop_scanline() along with interblock smoothing while decompressing the DC scan of a progressive JPEG image. Based on: https://github.com/mo271/libjpeg-turbo/commit/0227d4fb484e6baf1565163211ee64e52e7b96bd Fixes #456 Closes #457
DRC 6ab61fa1 2020-09-13T17:02:09 Merge branch 'master' into dev
DRC 6ee5d5f5 2020-07-28T18:06:20 ARMv8 NEON: Support Windows builds w/AArch64 MinGW Based on: https://github.com/mstorsjo/libjpeg-turbo/commit/c5ef6659285a7d5bc74c679aa87ad187186cf7e1 Closes #438
DRC fe79f56b 2020-07-28T15:09:00 Merge branch 'master' into dev
DRC c1037f43 2020-07-28T14:57:47 Fix bad return val when skipping past end of image Fixes #439
DRC a46c111d 2020-07-27T14:21:23 Further jpeg_skip_scanlines() fixes - Introduce a partial image decompression regression test script that validates the correctness of jpeg_skip_scanlines() and jpeg_crop_scanlines() for a variety of cropping regions and libjpeg settings. This regression test catches the following issues: #182, fixed in 5bc43c7821df982f65aa1c738f67fbf7cba8bd69 #237, fixed in 6e95c08649794f5018608f37250026a45ead2db8 #244, fixed in 398c1e9acc9b4531edceb3d77da0de5744675052 #441, fully fixed in this commit It does not catch the following issues: #194, fixed in 773040f9d949d5f313caf7507abaf4bd5d7ffa12 #244 (additional segfault), fixed in 9120a247436e84c0b4eea828cb11e8f665fcde30 - Modify the libjpeg-turbo regression test suite (make test) so that it checks for the issue reported in #441 (segfault in jpeg_skip_scanlines() when used with 4:2:0 merged upsampling/color conversion.) - Fix issues in jpeg_skip_scanlines() that caused incorrect output with h2v2 (4:2:0) merged upsampling/color conversion. The previous commit fixed the segfault reported in #441, but that was a symptom of a larger problem. Because merged 4:2:0 upsampling uses a "spare row" buffer, it is necessary to allow the upsampler to run when skipping rows (fancy 4:2:0 upsampling, which uses context rows, also requires this.) Otherwise, if skipping starts at an odd-numbered row, the output image will be incorrect. - Throw an error if jpeg_skip_scanlines() is called with two-pass color quantization enabled. With two-pass color quantization, the first pass occurs within jpeg_start_decompress(), so subsequent calls to jpeg_skip_scanlines() interfere with the multipass state and prevent the second pass from occurring during subsequent calls to jpeg_read_scanlines().
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