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#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#define NEED_newSVpvn_flags_GLOBAL
#include "ppport.h"
#include <stdint.h>
#include "define.h"
#include "type.h"
/* Int */
int32_t unpack_int(pTHX_ unsigned char *input, STRLEN len, STRLEN *pos)
{
if (UNLIKELY(len - *pos < 4))
croak("unpack_int: input too short. Data corrupted?");
int32_t result = (int32_t)ntohl(*(uint32_t*)(input+*pos));
*pos += 4;
return result;
}
STRLEN pack_int(pTHX_ SV *dest, int32_t number)
{
union {
int32_t number;
unsigned char bytes[4];
} int_or_bytes;
int_or_bytes.number = htonl(number);
sv_catpvn(dest, (char*)int_or_bytes.bytes, 4);
return SvCUR(dest)-4;
}
void set_packed_int(pTHX_ SV *dest, STRLEN pos, int32_t number)
{
STRLEN len;
char *ptr;
union {
int32_t number;
unsigned char bytes[4];
} int_or_bytes;
int_or_bytes.number = htonl(number);
ptr = SvPV(dest, len);
assert(pos <= len-4);
memcpy(ptr+pos, int_or_bytes.bytes, 4);
}
/* Short */
int unpack_short_nocroak(pTHX_ unsigned char *input, STRLEN len, STRLEN *pos, uint16_t *out)
{
if (UNLIKELY(len - *pos < 2))
return -1;
*out = ntohs(*(uint16_t*)(input+*pos));
*pos += 2;
return 0;
}
uint16_t unpack_short(pTHX_ unsigned char *input, STRLEN len, STRLEN *pos)
{
uint16_t out;
if (UNLIKELY(unpack_short_nocroak(aTHX_ input, len, pos, &out) != 0))
croak("unpack_short: invalid input");
return out;
}
void pack_short(pTHX_ SV *dest, uint16_t number)
{
union {
uint16_t number;
unsigned char bytes[2];
} short_or_bytes;
short_or_bytes.number = htons(number);
sv_catpvn(dest, (char*)short_or_bytes.bytes, 2);
}
/* Bytes */
int unpack_bytes(pTHX_ unsigned char *input, STRLEN len, STRLEN *pos, unsigned char **output, STRLEN *outlen)
{
int32_t bytes_length = unpack_int(aTHX_ input, len, pos);
if (bytes_length < 0) {
return 1;
}
if (UNLIKELY(len - *pos < bytes_length))
croak("unpack_bytes: input too short. Data corrupted?");
*output = input + *pos;
*outlen = bytes_length;
*pos += bytes_length;
return 0;
}
SV *unpack_bytes_sv(pTHX_ unsigned char *input, STRLEN len, STRLEN *pos)
{
unsigned char *bytes;
STRLEN bytes_len;
if (unpack_bytes(aTHX_ input, len, pos, &bytes, &bytes_len) == 0) {
return newSVpvn((char*)bytes, bytes_len);
} else {
return &PL_sv_undef;
}
}
/* String */
int unpack_string_nocroak(pTHX_ unsigned char *input, STRLEN len, STRLEN *pos, char **output, STRLEN *outlen)
{
uint16_t string_length = unpack_short(aTHX_ input, len, pos);
if (UNLIKELY(len - *pos < string_length))
return -1;
*output = (char*)(input + *pos);
*outlen = string_length;
*pos += string_length;
return 0;
}
void unpack_string(pTHX_ unsigned char *input, STRLEN len, STRLEN *pos, char **output, STRLEN *outlen)
{
if (UNLIKELY(unpack_string_nocroak(aTHX_ input, len, pos, output, outlen)) != 0)
croak("unpack_string: input invalid");
}
SV *unpack_string_sv(pTHX_ unsigned char *input, STRLEN len, STRLEN *pos)
{
char *string;
STRLEN str_len;
unpack_string(aTHX_ input, len, pos, &string, &str_len);
return newSVpvn_utf8(string, str_len, 1);
}
SV *unpack_string_sv_hash(pTHX_ unsigned char *input, STRLEN len, STRLEN *pos, U32 *hashout)
{
char *string;
STRLEN str_len;
unpack_string(aTHX_ input, len, pos, &string, &str_len);
PERL_HASH((*hashout), string, str_len);
return newSVpvn_utf8(string, str_len, 1);
}
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