notwa/crc32
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use exact type

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This commit is contained in:
Connor Olding 2015-04-11 10:41:52 -07:00
parent c9b1c760b1
commit e2291b22a2
2 changed files with 18 additions and 19 deletions
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20
crc32.c
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@ -1,9 +1,9 @@
enum { CRC_TABLE_SIZE = 0x100 }; enum { CRC_TABLE_SIZE = 0x100 };
ulong uint32_t
crc_reflect(ulong input) crc_reflect(uint32_t input)
{ {
ulong reflected = 0; uint32_t reflected = 0;
for (int i = 0; i < 4 * 8; i++) { for (int i = 0; i < 4 * 8; i++) {
reflected <<= 1; reflected <<= 1;
reflected |= input & 1; reflected |= input & 1;
@ -13,10 +13,10 @@ crc_reflect(ulong input)
} }
void void
crc_fill_table(ulong *table, int big, ulong polynomial) crc_fill_table(uint32_t *table, int big, uint32_t polynomial)
{ {
ulong lsb = (big) ? 1 << 31 : 1; /* least significant bit */ uint32_t lsb = (big) ? 1 << 31 : 1; /* least significant bit */
ulong poly = (big) ? polynomial : crc_reflect(polynomial); uint32_t poly = (big) ? polynomial : crc_reflect(polynomial);
for (int c = 0; c < CRC_TABLE_SIZE; c++, table++) { for (int c = 0; c < CRC_TABLE_SIZE; c++, table++) {
*table = (big) ? c << 24 : c; *table = (big) ? c << 24 : c;
@ -33,15 +33,15 @@ crc_fill_table(ulong *table, int big, ulong polynomial)
} }
void void
crc_be_cycle(ulong *table, ulong *remainder, char c) crc_be_cycle(uint32_t *table, uint32_t *remainder, char c)
{ {
ulong byte = table[(((*remainder) >> 24) ^ c) & 0xff]; uint32_t byte = table[(((*remainder) >> 24) ^ c) & 0xff];
*remainder = (((*remainder) << 8) ^ byte) & 0xFFFFFFFF; *remainder = (((*remainder) << 8) ^ byte) & 0xFFFFFFFF;
} }
void void
crc_le_cycle(ulong *table, ulong *remainder, char c) crc_le_cycle(uint32_t *table, uint32_t *remainder, char c)
{ {
ulong byte = table[((*remainder) ^ c) & 0xFF]; uint32_t byte = table[((*remainder) ^ c) & 0xFF];
*remainder = ((*remainder) >> 8) ^ byte; *remainder = ((*remainder) >> 8) ^ byte;
} }

17
main.c
View file

@ -1,7 +1,6 @@
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <stdint.h>
typedef unsigned long ulong;
#include "crc32.c" #include "crc32.c"
#include "args.c" #include "args.c"
@ -19,9 +18,9 @@ struct string_node_s {
static string_node *input_node = NULL; static string_node *input_node = NULL;
static ulong starting = 0xFFFFFFFF; static uint32_t starting = 0xFFFFFFFF;
static char big_endian = 0; static char big_endian = 0;
static ulong polynomial = 0x04C11DB7; static uint32_t polynomial = 0x04C11DB7;
static char print_binary = 0; static char print_binary = 0;
static char xor_output = 1; static char xor_output = 1;
static char reflect_output = 0; static char reflect_output = 0;
@ -118,13 +117,13 @@ open_stream(char *filename)
} }
static ulong static uint32_t
cycle_file(FILE *stream) cycle_file(FILE *stream)
{ {
ulong remainder = starting; uint32_t remainder = starting;
void (*cycle)(ulong*, ulong*, char) = void (*cycle)(uint32_t*, uint32_t*, char) =
(big_endian) ? crc_be_cycle : crc_le_cycle; (big_endian) ? crc_be_cycle : crc_le_cycle;
ulong table[CRC_TABLE_SIZE]; uint32_t table[CRC_TABLE_SIZE];
crc_fill_table(table, big_endian, polynomial); crc_fill_table(table, big_endian, polynomial);
do { do {
@ -146,7 +145,7 @@ cycle_file(FILE *stream)
} }
static void static void
print_crc(ulong remainder) print_crc(uint32_t remainder)
{ {
if (print_binary) if (print_binary)
fwrite(&remainder, sizeof(remainder), 1, stdout); fwrite(&remainder, sizeof(remainder), 1, stdout);