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package/mtd: reuse existing crc32 stuff in the trx code
* patch by Bernhard Loos * note: fixed compiler error on brcm47xx git-svn-id: svn://svn.openwrt.org/openwrt/trunk@20523 3c298f89-4303-0410-b956-a3cf2f4a3e73
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@ -7,7 +7,7 @@ extern const uint32_t crc32_table[256];
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/* Return a 32-bit CRC of the contents of the buffer. */
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static inline uint32_t
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static inline uint32_t
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crc32(uint32_t val, const void *ss, int len)
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{
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const unsigned char *s = ss;
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@ -16,4 +16,11 @@ crc32(uint32_t val, const void *ss, int len)
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return val;
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}
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static inline unsigned int crc32buf(char *buf, size_t len)
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{
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return crc32(0xFFFFFFFF, buf, len);
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}
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#endif
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@ -31,6 +31,7 @@
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#include <sys/ioctl.h>
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#include "mtd-api.h"
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#include "mtd.h"
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#include "crc32.h"
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#define TRX_MAGIC 0x30524448 /* "HDR0" */
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struct trx_header {
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@ -41,39 +42,6 @@ struct trx_header {
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unsigned offsets[3]; /* Offsets of partitions from start of header */
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};
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static unsigned long *crc32 = NULL;
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static void init_crc32()
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{
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unsigned long crc;
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unsigned long poly = 0xEDB88320L;
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int n, bit;
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if (crc32)
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return;
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crc32 = (unsigned long *) malloc(256 * sizeof(unsigned long));
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if (!crc32) {
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perror("malloc");
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exit(1);
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}
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for (n = 0; n < 256; n++) {
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crc = (unsigned long) n;
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for (bit = 0; bit < 8; bit++)
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crc = (crc & 1) ? (poly ^ (crc >> 1)) : (crc >> 1);
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crc32[n] = crc;
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}
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}
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static unsigned int crc32buf(char *buf, size_t len)
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{
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unsigned int crc = 0xFFFFFFFF;
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for (; len; len--, buf++)
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crc = crc32[(crc ^ *buf) & 0xff] ^ (crc >> 8);
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return crc;
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}
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int
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trx_fixup(int fd, const char *name)
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{
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