diff options
Diffstat (limited to 'src/target/image.c')
| -rw-r--r-- | src/target/image.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/target/image.c b/src/target/image.c index dbb1c2ab..d20f9df2 100644 --- a/src/target/image.c +++ b/src/target/image.c @@ -949,3 +949,34 @@ 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; + + 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; + } + } + + while (nbytes--) + { + /* as per gdb */ + crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ *buffer++) & 255]; + } + + *checksum = crc; + return ERROR_OK; +} + |