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Diffstat (limited to 'libs/zlib/src/crc32.c')
-rw-r--r--libs/zlib/src/crc32.c348
1 files changed, 174 insertions, 174 deletions
diff --git a/libs/zlib/src/crc32.c b/libs/zlib/src/crc32.c
index 979a7190a3..a7da8f56fb 100644
--- a/libs/zlib/src/crc32.c
+++ b/libs/zlib/src/crc32.c
@@ -184,16 +184,16 @@ local void write_table(out, table)
#include "crc32.h"
#endif /* DYNAMIC_CRC_TABLE */
-/* =========================================================================
- * This function can be used by asm versions of crc32()
- */
+ /* =========================================================================
+ * This function can be used by asm versions of crc32()
+ */
const z_crc_t FAR * ZEXPORT get_crc_table()
{
-#ifdef DYNAMIC_CRC_TABLE
- if (crc_table_empty)
- make_crc_table();
-#endif /* DYNAMIC_CRC_TABLE */
- return (const z_crc_t FAR *)crc_table;
+ #ifdef DYNAMIC_CRC_TABLE
+ if (crc_table_empty)
+ make_crc_table();
+ #endif /* DYNAMIC_CRC_TABLE */
+ return (const z_crc_t FAR *)crc_table;
}
/* ========================================================================= */
@@ -202,37 +202,37 @@ const z_crc_t FAR * ZEXPORT get_crc_table()
/* ========================================================================= */
unsigned long ZEXPORT crc32(crc, buf, len)
- unsigned long crc;
- const unsigned char FAR *buf;
- uInt len;
+unsigned long crc;
+const unsigned char FAR *buf;
+uInt len;
{
- if (buf == Z_NULL) return 0UL;
-
-#ifdef DYNAMIC_CRC_TABLE
- if (crc_table_empty)
- make_crc_table();
-#endif /* DYNAMIC_CRC_TABLE */
-
-#ifdef BYFOUR
- if (sizeof(void *) == sizeof(ptrdiff_t)) {
- z_crc_t endian;
-
- endian = 1;
- if (*((unsigned char *)(&endian)))
- return crc32_little(crc, buf, len);
- else
- return crc32_big(crc, buf, len);
- }
-#endif /* BYFOUR */
- crc = crc ^ 0xffffffffUL;
- while (len >= 8) {
- DO8;
- len -= 8;
- }
- if (len) do {
- DO1;
- } while (--len);
- return crc ^ 0xffffffffUL;
+ if (buf == Z_NULL) return 0UL;
+
+ #ifdef DYNAMIC_CRC_TABLE
+ if (crc_table_empty)
+ make_crc_table();
+ #endif /* DYNAMIC_CRC_TABLE */
+
+ #ifdef BYFOUR
+ if (sizeof(void *) == sizeof(ptrdiff_t)) {
+ z_crc_t endian;
+
+ endian = 1;
+ if (*((unsigned char *)(&endian)))
+ return crc32_little(crc, buf, len);
+ else
+ return crc32_big(crc, buf, len);
+ }
+ #endif /* BYFOUR */
+ crc = crc ^ 0xffffffffUL;
+ while (len >= 8) {
+ DO8;
+ len -= 8;
+ }
+ if (len) do {
+ DO1;
+ } while (--len);
+ return crc ^ 0xffffffffUL;
}
#ifdef BYFOUR
@@ -245,36 +245,36 @@ unsigned long ZEXPORT crc32(crc, buf, len)
/* ========================================================================= */
local unsigned long crc32_little(crc, buf, len)
- unsigned long crc;
- const unsigned char FAR *buf;
- unsigned len;
+unsigned long crc;
+const unsigned char FAR *buf;
+unsigned len;
{
- register z_crc_t c;
- register const z_crc_t FAR *buf4;
-
- c = (z_crc_t)crc;
- c = ~c;
- while (len && ((ptrdiff_t)buf & 3)) {
- c = crc_table[0][(c ^ *buf++) & 0xff] ^ (c >> 8);
- len--;
- }
-
- buf4 = (const z_crc_t FAR *)(const void FAR *)buf;
- while (len >= 32) {
- DOLIT32;
- len -= 32;
- }
- while (len >= 4) {
- DOLIT4;
- len -= 4;
- }
- buf = (const unsigned char FAR *)buf4;
-
- if (len) do {
- c = crc_table[0][(c ^ *buf++) & 0xff] ^ (c >> 8);
- } while (--len);
- c = ~c;
- return (unsigned long)c;
+ register z_crc_t c;
+ register const z_crc_t FAR *buf4;
+
+ c = (z_crc_t)crc;
+ c = ~c;
+ while (len && ((ptrdiff_t)buf & 3)) {
+ c = crc_table[0][(c ^ *buf++) & 0xff] ^ (c >> 8);
+ len--;
+ }
+
+ buf4 = (const z_crc_t FAR *)(const void FAR *)buf;
+ while (len >= 32) {
+ DOLIT32;
+ len -= 32;
+ }
+ while (len >= 4) {
+ DOLIT4;
+ len -= 4;
+ }
+ buf = (const unsigned char FAR *)buf4;
+
+ if (len) do {
+ c = crc_table[0][(c ^ *buf++) & 0xff] ^ (c >> 8);
+ } while (--len);
+ c = ~c;
+ return (unsigned long)c;
}
/* ========================================================================= */
@@ -285,38 +285,38 @@ local unsigned long crc32_little(crc, buf, len)
/* ========================================================================= */
local unsigned long crc32_big(crc, buf, len)
- unsigned long crc;
- const unsigned char FAR *buf;
- unsigned len;
+unsigned long crc;
+const unsigned char FAR *buf;
+unsigned len;
{
- register z_crc_t c;
- register const z_crc_t FAR *buf4;
-
- c = ZSWAP32((z_crc_t)crc);
- c = ~c;
- while (len && ((ptrdiff_t)buf & 3)) {
- c = crc_table[4][(c >> 24) ^ *buf++] ^ (c << 8);
- len--;
- }
-
- buf4 = (const z_crc_t FAR *)(const void FAR *)buf;
- buf4--;
- while (len >= 32) {
- DOBIG32;
- len -= 32;
- }
- while (len >= 4) {
- DOBIG4;
- len -= 4;
- }
- buf4++;
- buf = (const unsigned char FAR *)buf4;
-
- if (len) do {
- c = crc_table[4][(c >> 24) ^ *buf++] ^ (c << 8);
- } while (--len);
- c = ~c;
- return (unsigned long)(ZSWAP32(c));
+ register z_crc_t c;
+ register const z_crc_t FAR *buf4;
+
+ c = ZSWAP32((z_crc_t)crc);
+ c = ~c;
+ while (len && ((ptrdiff_t)buf & 3)) {
+ c = crc_table[4][(c >> 24) ^ *buf++] ^ (c << 8);
+ len--;
+ }
+
+ buf4 = (const z_crc_t FAR *)(const void FAR *)buf;
+ buf4--;
+ while (len >= 32) {
+ DOBIG32;
+ len -= 32;
+ }
+ while (len >= 4) {
+ DOBIG4;
+ len -= 4;
+ }
+ buf4++;
+ buf = (const unsigned char FAR *)buf4;
+
+ if (len) do {
+ c = crc_table[4][(c >> 24) ^ *buf++] ^ (c << 8);
+ } while (--len);
+ c = ~c;
+ return (unsigned long)(ZSWAP32(c));
}
#endif /* BYFOUR */
@@ -325,101 +325,101 @@ local unsigned long crc32_big(crc, buf, len)
/* ========================================================================= */
local unsigned long gf2_matrix_times(mat, vec)
- unsigned long *mat;
- unsigned long vec;
+unsigned long *mat;
+unsigned long vec;
{
- unsigned long sum;
-
- sum = 0;
- while (vec) {
- if (vec & 1)
- sum ^= *mat;
- vec >>= 1;
- mat++;
- }
- return sum;
+ unsigned long sum;
+
+ sum = 0;
+ while (vec) {
+ if (vec & 1)
+ sum ^= *mat;
+ vec >>= 1;
+ mat++;
+ }
+ return sum;
}
/* ========================================================================= */
local void gf2_matrix_square(square, mat)
- unsigned long *square;
- unsigned long *mat;
+unsigned long *square;
+unsigned long *mat;
{
- int n;
+ int n;
- for (n = 0; n < GF2_DIM; n++)
- square[n] = gf2_matrix_times(mat, mat[n]);
+ for (n = 0; n < GF2_DIM; n++)
+ square[n] = gf2_matrix_times(mat, mat[n]);
}
/* ========================================================================= */
local uLong crc32_combine_(crc1, crc2, len2)
- uLong crc1;
- uLong crc2;
- z_off64_t len2;
+uLong crc1;
+uLong crc2;
+z_off64_t len2;
{
- int n;
- unsigned long row;
- unsigned long even[GF2_DIM]; /* even-power-of-two zeros operator */
- unsigned long odd[GF2_DIM]; /* odd-power-of-two zeros operator */
-
- /* degenerate case (also disallow negative lengths) */
- if (len2 <= 0)
- return crc1;
-
- /* put operator for one zero bit in odd */
- odd[0] = 0xedb88320UL; /* CRC-32 polynomial */
- row = 1;
- for (n = 1; n < GF2_DIM; n++) {
- odd[n] = row;
- row <<= 1;
- }
-
- /* put operator for two zero bits in even */
- gf2_matrix_square(even, odd);
-
- /* put operator for four zero bits in odd */
- gf2_matrix_square(odd, even);
-
- /* apply len2 zeros to crc1 (first square will put the operator for one
- zero byte, eight zero bits, in even) */
- do {
- /* apply zeros operator for this bit of len2 */
- gf2_matrix_square(even, odd);
- if (len2 & 1)
- crc1 = gf2_matrix_times(even, crc1);
- len2 >>= 1;
-
- /* if no more bits set, then done */
- if (len2 == 0)
- break;
-
- /* another iteration of the loop with odd and even swapped */
- gf2_matrix_square(odd, even);
- if (len2 & 1)
- crc1 = gf2_matrix_times(odd, crc1);
- len2 >>= 1;
-
- /* if no more bits set, then done */
- } while (len2 != 0);
-
- /* return combined crc */
- crc1 ^= crc2;
- return crc1;
+ int n;
+ unsigned long row;
+ unsigned long even[GF2_DIM]; /* even-power-of-two zeros operator */
+ unsigned long odd[GF2_DIM]; /* odd-power-of-two zeros operator */
+
+ /* degenerate case (also disallow negative lengths) */
+ if (len2 <= 0)
+ return crc1;
+
+ /* put operator for one zero bit in odd */
+ odd[0] = 0xedb88320UL; /* CRC-32 polynomial */
+ row = 1;
+ for (n = 1; n < GF2_DIM; n++) {
+ odd[n] = row;
+ row <<= 1;
+ }
+
+ /* put operator for two zero bits in even */
+ gf2_matrix_square(even, odd);
+
+ /* put operator for four zero bits in odd */
+ gf2_matrix_square(odd, even);
+
+ /* apply len2 zeros to crc1 (first square will put the operator for one
+ zero byte, eight zero bits, in even) */
+ do {
+ /* apply zeros operator for this bit of len2 */
+ gf2_matrix_square(even, odd);
+ if (len2 & 1)
+ crc1 = gf2_matrix_times(even, crc1);
+ len2 >>= 1;
+
+ /* if no more bits set, then done */
+ if (len2 == 0)
+ break;
+
+ /* another iteration of the loop with odd and even swapped */
+ gf2_matrix_square(odd, even);
+ if (len2 & 1)
+ crc1 = gf2_matrix_times(odd, crc1);
+ len2 >>= 1;
+
+ /* if no more bits set, then done */
+ } while (len2 != 0);
+
+ /* return combined crc */
+ crc1 ^= crc2;
+ return crc1;
}
/* ========================================================================= */
uLong ZEXPORT crc32_combine(crc1, crc2, len2)
- uLong crc1;
- uLong crc2;
- z_off_t len2;
+uLong crc1;
+uLong crc2;
+z_off_t len2;
{
- return crc32_combine_(crc1, crc2, len2);
+ return crc32_combine_(crc1, crc2, len2);
}
uLong ZEXPORT crc32_combine64(crc1, crc2, len2)
- uLong crc1;
- uLong crc2;
- z_off64_t len2;
+uLong crc1;
+uLong crc2;
+z_off64_t len2;
{
- return crc32_combine_(crc1, crc2, len2);
+ return crc32_combine_(crc1, crc2, len2);
}
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