/* * endian.c * * Simple helper functions for reading and writing BE and LE numbers * * Copyright (c) 2004 Steve McIntyre <steve@einval.com> * * GPL v2 - see COPYING */ #include "endian.h" /* Write a 64-bit quantity out into memory in BIG ENDIAN order */ void write_be64(in, out) unsigned long long in; unsigned char *out; { out[0] = (in >> 56) & 0xFF; out[1] = (in >> 48) & 0xFF; out[2] = (in >> 40) & 0xFF; out[3] = (in >> 32) & 0xFF; out[4] = (in >> 24) & 0xFF; out[5] = (in >> 16) & 0xFF; out[6] = (in >> 8) & 0xFF; out[7] = in & 0xFF; } /* Read in a 64-bit BIG ENDIAN quantity */ unsigned long long read_be64(in) unsigned char *in; { unsigned long long result = 0; result |= (unsigned long long)in[0] << 56; result |= (unsigned long long)in[1] << 48; result |= (unsigned long long)in[2] << 40; result |= (unsigned long long)in[3] << 32; result |= (unsigned long long)in[4] << 24; result |= (unsigned long long)in[5] << 16; result |= (unsigned long long)in[6] << 8; result |= (unsigned long long)in[7]; return result; } /* Write a 64-bit quantity out into memory in LITTLE ENDIAN order */ void write_le64(in, out) unsigned long long in; unsigned char *out; { out[0] = in & 0xFF; out[1] = (in >> 8) & 0xFF; out[2] = (in >> 16) & 0xFF; out[3] = (in >> 24) & 0xFF; out[4] = (in >> 32) & 0xFF; out[5] = (in >> 40) & 0xFF; out[6] = (in >> 48) & 0xFF; out[7] = (in >> 56) & 0xFF; } /* Read in a 64-bit LITTLE ENDIAN quantity */ unsigned long long read_le64(in) unsigned char *in; { unsigned long long result = 0; result |= (unsigned long long)in[0]; result |= (unsigned long long)in[1] << 8; result |= (unsigned long long)in[2] << 16; result |= (unsigned long long)in[3] << 24; result |= (unsigned long long)in[4] << 32; result |= (unsigned long long)in[5] << 40; result |= (unsigned long long)in[6] << 48; result |= (unsigned long long)in[7] << 56; return result; } /* Write a 48-bit quantity out into memory in LITTLE ENDIAN order */ void write_le48(in, out) unsigned long long in; unsigned char *out; { out[0] = in & 0xFF; out[1] = (in >> 8) & 0xFF; out[2] = (in >> 16) & 0xFF; out[3] = (in >> 24) & 0xFF; out[4] = (in >> 32) & 0xFF; out[5] = (in >> 40) & 0xFF; } /* Read in a 48-bit LITTLE ENDIAN quantity */ unsigned long long read_le48(in) unsigned char *in; { unsigned long long result = 0; result |= (unsigned long long)in[0]; result |= (unsigned long long)in[1] << 8; result |= (unsigned long long)in[2] << 16; result |= (unsigned long long)in[3] << 24; result |= (unsigned long long)in[4] << 32; result |= (unsigned long long)in[5] << 40; return result; } /* Write a 32-bit quantity out into memory in BIG ENDIAN order */ void write_be32(in, out) unsigned long in; unsigned char *out; { out[0] = (in >> 24) & 0xFF; out[1] = (in >> 16) & 0xFF; out[2] = (in >> 8) & 0xFF; out[3] = in & 0xFF; } /* Read in a 32-bit BIG ENDIAN quantity */ unsigned long read_be32(in) unsigned char *in; { unsigned long result = 0; result |= (unsigned long)in[0] << 24; result |= (unsigned long)in[1] << 16; result |= (unsigned long)in[2] << 8; result |= (unsigned long)in[3]; return result; } /* Write a 32-bit quantity out into memory in LITTLE ENDIAN order */ void write_le32(in, out) unsigned long in; unsigned char *out; { out[0] = in & 0xFF; out[1] = (in >> 8) & 0xFF; out[2] = (in >> 16) & 0xFF; out[3] = (in >> 24) & 0xFF; } /* Read in a 32-bit LITTLE ENDIAN quantity */ unsigned long read_le32(in) unsigned char *in; { unsigned long result = 0; result |= (unsigned long)in[0]; result |= (unsigned long)in[1] << 8; result |= (unsigned long)in[2] << 16; result |= (unsigned long)in[3] << 24; return result; } /* Write a 16-bit quantity out into memory in BIG ENDIAN order */ void write_be16(in, out) unsigned short in; unsigned char *out; { out[0] = (in >> 8) & 0xFF; out[1] = in & 0xFF; } /* Read in a 16-bit BIG ENDIAN quantity */ unsigned short read_be16(in) unsigned char *in; { unsigned short result = 0; result |= (unsigned short)in[0] << 8; result |= (unsigned short)in[1]; return result; } /* Write a 16-bit quantity out into memory in LITTLE ENDIAN order */ void write_le16(in, out) unsigned short in; unsigned char *out; { out[0] = in & 0xFF; out[1] = in & 0xFF >> 8; } /* Read in a 16-bit LITTLE ENDIAN quantity */ unsigned short read_le16(in) unsigned char *in; { unsigned short result = 0; result |= (unsigned short)in[0]; result |= (unsigned short)in[1] << 8; return result; }

Generated by Doxygen 1.6.0 Back to index