diff options
Diffstat (limited to 'genisoimage/endian.c')
| -rw-r--r-- | genisoimage/endian.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/genisoimage/endian.c b/genisoimage/endian.c new file mode 100644 index 0000000..461e65c --- /dev/null +++ b/genisoimage/endian.c @@ -0,0 +1,177 @@ +/* + * endian.c + * + * Copyright (c) 2004-2006 Steve McIntyre <steve@einval.com> + * + * Simple helper routines for marshalling data + * + * GNU GPL v2 + */ + +#include <mconfig.h> +#include "endianconv.h" + +/* Write a 64-bit quantity out into memory in BIG ENDIAN order */ +void write_be64(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(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(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(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(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(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(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(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(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(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(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(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(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(unsigned char *in) +{ + unsigned short result = 0; + + result |= (unsigned short)in[0]; + result |= (unsigned short)in[1] << 8; + return result; +} + |