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better keep_alive() handling 

git-svn-id: svn://svn.berlios.de/openocd/trunk@1018 b42882b7-edfa-0310-969c-e2dbd0fdcd60
This commit is contained in:
oharboe 2008-10-06 11:16:10 +00:00
parent 333499a962
commit 7b369df52c
1 changed files with 27 additions and 21 deletions
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48
src/target/image.c
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@ -998,36 +998,42 @@ int image_close(image_t *image)
return ERROR_OK;
}
static u32 crc32_table[256] = {0, 0};
int image_calculate_checksum(u8* buffer, u32 nbytes, u32* checksum)
{
u32 crc = 0xffffffff;
LOG_DEBUG("Calculating checksum");
if (!crc32_table[1])
{
/* Initialize the CRC table and the decoding table. */
int i, j;
unsigned int c;
for (i = 0; i < 256; i++)
{
/* as per gdb */
for (c = i << 24, j = 8; j > 0; --j)
c = c & 0x80000000 ? (c << 1) ^ 0x04c11db7 : (c << 1);
crc32_table[i] = c;
}
}
u32 crc32_table[256];
while (nbytes--)
/* Initialize the CRC table and the decoding table. */
int i, j;
unsigned int c;
for (i = 0; i < 256; i++)
{
/* as per gdb */
crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ *buffer++) & 255];
if ((nbytes%16384)==0)
{
keep_alive();
}
for (c = i << 24, j = 8; j > 0; --j)
c = c & 0x80000000 ? (c << 1) ^ 0x04c11db7 : (c << 1);
crc32_table[i] = c;
}
while (nbytes>0)
{
int run=nbytes;
if (run>32768)
{
run=32768;
}
nbytes-=run;
while (run--)
{
/* as per gdb */
crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ *buffer++) & 255];
}
keep_alive();
}
LOG_DEBUG("Calculating checksum done");
*checksum = crc;
return ERROR_OK;
}