diff options
Diffstat (limited to 'llvm/lib/Support/CRC.cpp')
| -rw-r--r-- | llvm/lib/Support/CRC.cpp | 12 |
1 files changed, 10 insertions, 2 deletions
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<uint8_t> Data) { #include <zlib.h> uint32_t llvm::crc32(uint32_t CRC, ArrayRef<uint8_t> 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<uint8_t> 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 |