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mkimage : Split out and clean pbl_crc32 for use by other image types

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The crc32 used by pblimgae is NOT the same as zlib crc32.

The pbl_crc32 is useful for other purposes in mkimage so split it out.

While we are about it, clean up redundant and confusing code.

Signed-off-by: Charles Manning <cdhmanning@gmail.com>
This commit is contained in:
Charles Manning 2014-05-14 14:45:00 +12:00 committed by Tom Rini
parent 4eb580b780
commit abbc67eedf
4 changed files with 71 additions and 46 deletions
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1
tools/Makefile
View file

@ -91,6 +91,7 @@ dumpimage-mkimage-objs := aisimage.o \
omapimage.o \
os_support.o \
pblimage.o \
pbl_crc32.o \
sha1.o \
sha256.o \
ublimage.o \

56
tools/pbl_crc32.c Normal file
View file

@ -0,0 +1,56 @@
/*
* Copyright 2012 Freescale Semiconductor, Inc.
*
* Cleaned up and refactored by Charles Manning.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include "pblimage.h"
static uint32_t crc_table[256];
static int crc_table_valid;
static void make_crc_table(void)
{
uint32_t mask;
int i, j;
uint32_t poly; /* polynomial exclusive-or pattern */
if (crc_table_valid)
return;
/*
* the polynomial used by PBL is 1 + x1 + x2 + x4 + x5 + x7 + x8 + x10
* + x11 + x12 + x16 + x22 + x23 + x26 + x32.
*/
poly = 0x04c11db7;
for (i = 0; i < 256; i++) {
mask = i << 24;
for (j = 0; j < 8; j++) {
if (mask & 0x80000000)
mask = (mask << 1) ^ poly;
else
mask <<= 1;
}
crc_table[i] = mask;
}
crc_table_valid = 1;
}
uint32_t pbl_crc32(uint32_t in_crc, const char *buf, uint32_t len)
{
uint32_t crc32_val;
int i;
make_crc_table();
crc32_val = ~in_crc;
for (i = 0; i < len; i++)
crc32_val = (crc32_val << 8) ^
crc_table[(crc32_val >> 24) ^ (*buf++ & 0xff)];
return crc32_val;
}

13
tools/pbl_crc32.h Normal file
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@ -0,0 +1,13 @@
/*
* Copyright 2012 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef PBLCRC32_H
#define PBLCRC32_H
#include <stdint.h>
uint32_t pbl_crc32(uint32_t in_crc, const char *buf, uint32_t len);
#endif

47
tools/pblimage.c
View file

@ -6,6 +6,7 @@
#include "imagetool.h"
#include <image.h>
#include "pblimage.h"
#include "pbl_crc32.h"
/*
* Initialize to an invalid value.
@ -137,52 +138,6 @@ static void pbl_parser(char *name)
fclose(fd);
}
static uint32_t crc_table[256];
static void make_crc_table(void)
{
uint32_t mask;
int i, j;
uint32_t poly; /* polynomial exclusive-or pattern */
/*
* the polynomial used by PBL is 1 + x1 + x2 + x4 + x5 + x7 + x8 + x10
* + x11 + x12 + x16 + x22 + x23 + x26 + x32.
*/
poly = 0x04c11db7;
for (i = 0; i < 256; i++) {
mask = i << 24;
for (j = 0; j < 8; j++) {
if (mask & 0x80000000)
mask = (mask << 1) ^ poly;
else
mask <<= 1;
}
crc_table[i] = mask;
}
}
unsigned long pbl_crc32(unsigned long crc, const char *buf, uint32_t len)
{
uint32_t crc32_val = 0xffffffff;
uint32_t xor = 0x0;
int i;
make_crc_table();
for (i = 0; i < len; i++)
crc32_val = (crc32_val << 8) ^
crc_table[(crc32_val >> 24) ^ (*buf++ & 0xff)];
crc32_val = crc32_val ^ xor;
if (crc32_val < 0) {
crc32_val += 0xffffffff;
crc32_val += 1;
}
return crc32_val;
}
static uint32_t reverse_byte(uint32_t val)
{
uint32_t temp;