Add 'neozip/' from commit 'c2712b8a345191f6ed79558c089777df94590087'

git-subtree-dir: neozip
git-subtree-mainline: b1e34e861b5d732afe828d58aad2c638135061fd
git-subtree-split: c2712b8a345191f6ed79558c089777df94590087

1 files changed, 71 insertions, 0 deletions

diff --git a/neozip/arch/loongarch/crc32_la.c b/neozip/arch/loongarch/crc32_la.c
new file mode 100644
index 0000000000..f1bd314e65
--- /dev/null
+++ b/neozip/arch/loongarch/crc32_la.c
@@ -0,0 +1,71 @@
+/* crc32_la.c - LoongArch version of crc32
+ * Copyright (C) 2025 Vladislav Shchapov <vladislav@shchapov.ru>
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#ifdef LOONGARCH_CRC
+
+#include "zbuild.h"
+
+#include <larchintrin.h>
+
+Z_INTERNAL uint32_t crc32_loongarch64(uint32_t crc, const uint8_t *buf, size_t len) {
+    uint32_t c = ~crc;
+
+    if (UNLIKELY(len == 1)) {
+        c = (uint32_t)__crc_w_b_w((char)(*buf), (int)c);
+        c = ~c;
+        return c;
+    }
+
+    uintptr_t align_diff = ALIGN_DIFF(buf, 8);
+    if (align_diff) {
+        if (len && (align_diff & 1)) {
+            c = (uint32_t)__crc_w_b_w((char)(*buf++), (int)c);
+            len--;
+        }
+
+        if (len >= 2 && (align_diff & 2)) {
+            c = (uint32_t)__crc_w_h_w((short)*((uint16_t*)buf), (int)c);
+            buf += 2;
+            len -= 2;
+        }
+
+        if (len >= 4 && (align_diff & 4)) {
+            c = (uint32_t)__crc_w_w_w((int)*((uint32_t*)buf), (int)c);
+            len -= 4;
+            buf += 4;
+        }
+
+    }
+
+    while (len >= 8) {
+        c = (uint32_t)__crc_w_d_w((long int)*((uint64_t*)buf), (int)c);
+        len -= 8;
+        buf += 8;
+    }
+
+    if (len & 4) {
+        c = (uint32_t)__crc_w_w_w((int)*((uint32_t*)buf), (int)c);
+        buf += 4;
+    }
+
+    if (len & 2) {
+        c = (uint32_t)__crc_w_h_w((short)*((uint16_t*)buf), (int)c);
+        buf += 2;
+    }
+
+    if (len & 1) {
+        c = (uint32_t)__crc_w_b_w((char)(*buf), (int)c);
+    }
+
+    c = ~c;
+    return c;
+}
+
+Z_INTERNAL uint32_t crc32_copy_loongarch64(uint32_t crc, uint8_t *dst, const uint8_t *src, size_t len) {
+    crc = crc32_loongarch64(crc, src, len);
+    memcpy(dst, src, len);
+    return crc;
+}
+#endif