From cfca06d7963fa0909f90483b42a6d7d194d01e08 Mon Sep 17 00:00:00 2001 From: Dimitry Andric Date: Sun, 26 Jul 2020 19:36:28 +0000 Subject: Vendor import of llvm-project master 2e10b7a39b9, the last commit before the llvmorg-12-init tag, from which release/11.x was branched. --- llvm/lib/Support/CRC.cpp | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) (limited to 'llvm/lib/Support/CRC.cpp') diff --git a/llvm/lib/Support/CRC.cpp b/llvm/lib/Support/CRC.cpp index a3dba1a3aa10..7ff09debe3b7 100644 --- a/llvm/lib/Support/CRC.cpp +++ b/llvm/lib/Support/CRC.cpp @@ -25,7 +25,7 @@ using namespace llvm; -#if !LLVM_ENABLE_ZLIB +#if LLVM_ENABLE_ZLIB == 0 || !HAVE_ZLIB_H static const uint32_t CRCTable[256] = { 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, @@ -85,7 +85,15 @@ uint32_t llvm::crc32(uint32_t CRC, ArrayRef Data) { #include uint32_t llvm::crc32(uint32_t CRC, ArrayRef Data) { - return ::crc32(CRC, (const Bytef *)Data.data(), Data.size()); + // Zlib's crc32() only takes a 32-bit length, so we have to iterate for larger + // sizes. One could use crc32_z() instead, but that's a recent (2017) addition + // and may not be available on all systems. + do { + ArrayRef Slice = Data.take_front(UINT32_MAX); + CRC = ::crc32(CRC, (const Bytef *)Slice.data(), (uInt)Slice.size()); + Data = Data.drop_front(Slice.size()); + } while (Data.size() > 0); + return CRC; } #endif -- cgit v1.2.3