vendor: OpenCV 5.0.0 snapshot at 40738fb16ceddb5fb3fea747585f7ce6abb0605b

2026-08-22 00:10:33 +08:00
commit f7f077da11
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+/* adler32_p.h -- Private inline functions and macros shared with
+ *                different computation of the Adler-32 checksum
+ *                of a data stream.
+ * Copyright (C) 1995-2011, 2016 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#ifndef ADLER32_P_H
+#define ADLER32_P_H
+
+#define BASE 65521U     /* largest prime smaller than 65536 */
+#define NMAX 5552
+/* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
+
+#define DO1(sum1, sum2, buf, i)  {(sum1) += buf[(i)]; (sum2) += (sum1);}
+#define DO2(sum1, sum2, buf, i)  {DO1(sum1, sum2, buf, i); DO1(sum1, sum2, buf, i+1);}
+#define DO4(sum1, sum2, buf, i)  {DO2(sum1, sum2, buf, i); DO2(sum1, sum2, buf, i+2);}
+#define DO8(sum1, sum2, buf, i)  {DO4(sum1, sum2, buf, i); DO4(sum1, sum2, buf, i+4);}
+#define DO16(sum1, sum2, buf)    {DO8(sum1, sum2, buf, 0); DO8(sum1, sum2, buf, 8);}
+
+static inline uint32_t adler32_len_1(uint32_t adler, const uint8_t *buf, uint32_t sum2) {
+    adler += buf[0];
+    adler %= BASE;
+    sum2 += adler;
+    sum2 %= BASE;
+    return adler | (sum2 << 16);
+}
+
+static inline uint32_t adler32_len_16(uint32_t adler, const uint8_t *buf, size_t len, uint32_t sum2) {
+    while (len) {
+        --len;
+        adler += *buf++;
+        sum2 += adler;
+    }
+    adler %= BASE;
+    sum2 %= BASE;            /* only added so many BASE's */
+    /* return recombined sums */
+    return adler | (sum2 << 16);
+}
+
+static inline uint32_t adler32_copy_len_16(uint32_t adler, const uint8_t *buf, uint8_t *dst, size_t len, uint32_t sum2) {
+    while (len--) {
+        *dst = *buf++;
+        adler += *dst++;
+        sum2 += adler;
+    }
+    adler %= BASE;
+    sum2 %= BASE;            /* only added so many BASE's */
+    /* return recombined sums */
+    return adler | (sum2 << 16);
+}
+
+static inline uint32_t adler32_len_64(uint32_t adler, const uint8_t *buf, size_t len, uint32_t sum2) {
+#ifdef UNROLL_MORE
+    while (len >= 16) {
+        len -= 16;
+        DO16(adler, sum2, buf);
+        buf += 16;
+#else
+    while (len >= 8) {
+        len -= 8;
+        DO8(adler, sum2, buf, 0);
+        buf += 8;
+#endif
+    }
+    /* Process tail (len < 16).  */
+    return adler32_len_16(adler, buf, len, sum2);
+}
+
+#endif /* ADLER32_P_H */