sed: open input files sequentially to avoid EMFILE

[oweals/busybox.git] / libbb / crc32.c

diff --git a/libbb/crc32.c b/libbb/crc32.c
index 42079b9c597f8cfd73e2eec56aed05849f108097..ac9836cc9e61b185e08687e75c73c380fc751762 100644 (file)
--- a/libbb/crc32.c
+++ b/libbb/crc32.c
@@ -12,10 +12,14 @@
  *
  * endian = 1: big-endian
  * endian = 0: little-endian
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
  */
 
 #include "libbb.h"
 
+uint32_t *global_crc32_table;
+
 uint32_t* FAST_FUNC crc32_filltable(uint32_t *crc_table, int endian)
 {
        uint32_t polynomial = endian ? 0x04c11db7 : 0xedb88320;
@@ -38,3 +42,25 @@ uint32_t* FAST_FUNC crc32_filltable(uint32_t *crc_table, int endian)
 
        return crc_table - 256;
 }
+
+uint32_t FAST_FUNC crc32_block_endian1(uint32_t val, const void *buf, unsigned len, uint32_t *crc_table)
+{
+       const void *end = (uint8_t*)buf + len;
+
+       while (buf != end) {
+               val = (val << 8) ^ crc_table[(val >> 24) ^ *(uint8_t*)buf];
+               buf = (uint8_t*)buf + 1;
+       }
+       return val;
+}
+
+uint32_t FAST_FUNC crc32_block_endian0(uint32_t val, const void *buf, unsigned len, uint32_t *crc_table)
+{
+       const void *end = (uint8_t*)buf + len;
+
+       while (buf != end) {
+               val = crc_table[(uint8_t)val ^ *(uint8_t*)buf] ^ (val >> 8);
+               buf = (uint8_t*)buf + 1;
+       }
+       return val;
+}