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<p><pre><code> static int hexdigit(char x) { if (x >= '0' && x <= '9') return x - '0'; if (x >= 'a' && x <= 'f') return 10 + (x - 'a'); if (x >= 'A' && x <= 'F') return 10 + (x - 'A'); return -1; } int hexparse(unsigned char *y,long long len,const char *x) { if (!x) return 0; while (len > 0) { int digit0; int digit1; digit0 = hexdigit(x[0]); if (digit0 == -1) return 0; digit1 = hexdigit(x[1]); if (digit1 == -1) return 0; *y++ = digit1 + 16 * digit0; --len; x += 2; } if (x[0]) return 0; return 1; } #define BLOCK 4096 static unsigned char buf[BLOCK + 1]; int main(int argc, char **argv) { long long r,w; for (;;) { r = readblock(0, buf, BLOCK); if (r == -1) _exit(0); for (;;) { if (r <= 0) goto end; if (buf[r - 1] == '\n') { --r; continue; } if (buf[r - 1] == '\r') { --r; continue; } break; } buf[r] = 0; if (r % 2) _exit(0); w = r / 2; if (!hexparse(buf, w, (char *)buf)) break; if (writeall(1, buf, w) == -1) break; if (r != BLOCK) break; } end: if (fsyncfd(1) == -1) _exit(0); _exit(0); }</code></pre>

Convert hex to binary faster than xxd part 2/2

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Convert hex to binary faster than xxd part 2/2

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