81 lines
1.3 KiB
C
81 lines
1.3 KiB
C
#include <stdint.h>
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/* Toggle the 16 bit unsigned integer pointed by *p from little endian to
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* big endian */
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void memrev16(void *p) {
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unsigned char *x = p, t;
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t = x[0];
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x[0] = x[1];
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x[1] = t;
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}
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/* Toggle the 32 bit unsigned integer pointed by *p from little endian to
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* big endian */
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void memrev32(void *p) {
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unsigned char *x = p, t;
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t = x[0];
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x[0] = x[3];
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x[3] = t;
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t = x[1];
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x[1] = x[2];
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x[2] = t;
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}
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/* Toggle the 64 bit unsigned integer pointed by *p from little endian to
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* big endian */
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void memrev64(void *p) {
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unsigned char *x = p, t;
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t = x[0];
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x[0] = x[7];
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x[7] = t;
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t = x[1];
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x[1] = x[6];
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x[6] = t;
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t = x[2];
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x[2] = x[5];
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x[5] = t;
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t = x[3];
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x[3] = x[4];
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x[4] = t;
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}
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uint16_t intrev16(uint16_t v) {
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memrev16(&v);
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return v;
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}
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uint32_t intrev32(uint32_t v) {
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memrev32(&v);
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return v;
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}
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uint64_t intrev64(uint64_t v) {
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memrev64(&v);
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return v;
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}
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#ifdef TESTMAIN
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#include <stdio.h>
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int main(void) {
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char buf[32];
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sprintf(buf,"ciaoroma");
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memrev16(buf);
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printf("%s\n", buf);
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sprintf(buf,"ciaoroma");
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memrev32(buf);
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printf("%s\n", buf);
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sprintf(buf,"ciaoroma");
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memrev64(buf);
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printf("%s\n", buf);
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return 0;
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}
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#endif
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