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php-src/ext/standard/pack.c

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/*
+----------------------------------------------------------------------+
| PHP HTML Embedded Scripting Language Version 3.0 |
+----------------------------------------------------------------------+
| Copyright (c) 1997,1998 PHP Development Team (See Credits file) |
+----------------------------------------------------------------------+
| This program is free software; you can redistribute it and/or modify |
| it under the terms of one of the following licenses: |
| |
| A) the GNU General Public License as published by the Free Software |
| Foundation; either version 2 of the License, or (at your option) |
| any later version. |
| |
| B) the PHP License as published by the PHP Development Team and |
| included in the distribution in the file: LICENSE |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of both licenses referred to here. |
| If you did not, or have any questions about PHP licensing, please |
| contact core@php.net. |
+----------------------------------------------------------------------+
| Authors: Chris Schneider <cschneid@relog.ch> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "php.h"
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#if MSVC5
#include <windows.h>
#include <winsock.h>
#define O_RDONLY _O_RDONLY
#include "win32/param.h"
#else
#include <sys/param.h>
#endif
#include "ext/standard/head.h"
#include "safe_mode.h"
#include "php3_string.h"
#include "pack.h"
#if HAVE_PWD_H
#if MSVC5
#include "win32/pwd.h"
#else
#include <pwd.h>
#endif
#endif
#include "snprintf.h"
#include "fsock.h"
#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
function_entry pack_functions[] = {
{"pack", php3_pack, NULL},
{"unpack", php3_unpack, NULL},
{NULL, NULL, NULL}
};
php3_module_entry pack_module_entry = {
"PHP_pack", pack_functions, php3_minit_pack, NULL, NULL, NULL, NULL, STANDARD_MODULE_PROPERTIES
};
/* Whether machine is little endian */
char machine_little_endian;
/* Mapping of byte from char (8bit) to long for machine endian */
static int byte_map[1];
/* Mappings of bytes from int (machine dependant) to int for machine endian */
static int int_map[sizeof(int)];
/* Mappings of bytes from shorts (16bit) for all endian environments */
static int machine_endian_short_map[2];
static int big_endian_short_map[2];
static int little_endian_short_map[2];
/* Mappings of bytes from longs (32bit) for all endian environments */
static int machine_endian_long_map[4];
static int big_endian_long_map[4];
static int little_endian_long_map[4];
static void _php3_pack(pval *val, int size, int *map, char *output)
{
int i;
char *v;
convert_to_long(val);
v = (char *)&val->value.lval;
for (i = 0; i < size; i++) {
*(output++) = v[map[i]];
}
}
/* pack() idea stolen from Perl (implemented formats behave the same as there)
* Implemented formats are A,a,h,H,c,C,s,S,i,I,l,L,n,N,f,d,x,X,@.
*/
/* {{{ proto string pack(string format, mixed arg1, mixed arg2, ...)
Takes 1 or more arguments and packs them into a binary string according to the format argument */
PHP_FUNCTION(pack)
{
pval **argv;
int argc, i;
int currentarg;
char *format;
int formatlen;
char *formatcodes;
int *formatargs;
int formatcount = 0;
int outputpos = 0, outputsize = 0;
char *output;
argc = ARG_COUNT(ht);
if (argc < 1) {
WRONG_PARAM_COUNT;
}
argv = emalloc(argc * sizeof(pval *));
if (getParametersArray(ht, argc, argv) == FAILURE) {
efree(argv);
WRONG_PARAM_COUNT;
}
convert_to_string(argv[0]);
format = argv[0]->value.str.val;
formatlen = argv[0]->value.str.len;
/* We have a maximum of <formatlen> format codes to deal with */
formatcodes = emalloc(formatlen * sizeof(*formatcodes));
formatargs = emalloc(formatlen * sizeof(*formatargs));
currentarg = 1;
/* Preprocess format into formatcodes and formatargs */
for (i = 0; i < formatlen; formatcount++) {
char code = format[i++];
int arg = 1;
/* Handle format arguments if any */
if (i < formatlen) {
char c = format[i];
if (c == '*') {
arg = -1;
i++;
}
else if ((c >= '0') && (c <= '9')) {
arg = atoi(&format[i]);
while (format[i] >= '0' && format[i] <= '9' && i < formatlen) {
i++;
}
}
}
/* Handle special arg '*' for all codes and check argv overflows */
switch ((int)code) {
/* Never uses any args */
case 'x': case 'X': case '@': {
if (arg < 0) {
php3_error(E_WARNING, "pack type %c: '*' ignored", code);
arg = 1;
}
break;
}
/* Always uses one arg */
case 'a': case 'A': case 'h': case 'H': {
if (currentarg >= argc) {
efree(argv);
efree(formatcodes);
efree(formatargs);
php3_error(E_ERROR, "pack type %c: not enough arguments", code);
RETURN_FALSE;
}
if (arg < 0) {
arg = argv[currentarg]->value.str.len;
}
currentarg++;
break;
}
/* Use as many args as specified */
case 'c': case 'C': case 's': case 'S': case 'i': case 'I':
case 'l': case 'L': case 'n': case 'N': case 'v': case 'V':
case 'f': case 'd': {
if (arg < 0) {
arg = argc - currentarg;
}
currentarg += arg;
if (currentarg > argc) {
efree(argv);
efree(formatcodes);
efree(formatargs);
php3_error(E_ERROR, "pack type %c: too few arguments", code);
RETURN_FALSE;
}
break;
}
default: {
php3_error(E_ERROR, "pack type %c: unknown format code", code);
RETURN_FALSE;
}
}
formatcodes[formatcount] = code;
formatargs[formatcount] = arg;
}
if (currentarg < argc) {
php3_error(E_WARNING, "pack %d arguments unused", (argc - currentarg));
}
/* Calculate output length and upper bound while processing*/
for (i = 0; i < formatcount; i++) {
int code = (int)formatcodes[i];
int arg = formatargs[i];
switch ((int)code) {
case 'h': case 'H': {
outputpos += (arg + 1) / 2; /* 4 bit per arg */
break;
}
case 'a': case 'A':
case 'c': case 'C':
case 'x': {
outputpos += arg; /* 8 bit per arg */
break;
}
case 's': case 'S': case 'n': case 'v': {
outputpos += arg * 2; /* 16 bit per arg */
break;
}
case 'i': case 'I': {
outputpos += arg * sizeof(int);
break;
}
case 'l': case 'L': case 'N': case 'V': {
outputpos += arg * 4; /* 32 bit per arg */
break;
}
case 'f': {
outputpos += arg * sizeof(float);
break;
}
case 'd': {
outputpos += arg * sizeof(double);
break;
}
case 'X': {
outputpos -= arg;
if (outputpos < 0) {
php3_error(E_WARNING, "pack type %c: outside of string", code);
outputpos = 0;
}
break;
}
case '@': {
outputpos = arg;
break;
}
}
if (outputsize < outputpos) {
outputsize = outputpos;
}
}
output = emalloc(outputsize + 1);
outputpos = 0;
currentarg = 1;
/* Do actual packing */
for (i = 0; i < formatcount; i++) {
int code = (int)formatcodes[i];
int arg = formatargs[i];
pval *val;
switch ((int)code) {
case 'a': case 'A': {
memset(&output[outputpos], (code == 'a') ? '\0' : ' ', arg);
val = argv[currentarg++];
convert_to_string(val);
memcpy(&output[outputpos], val->value.str.val,
(val->value.str.len < arg) ? val->value.str.len : arg);
outputpos += arg;
break;
}
case 'h': case 'H': {
int nibbleshift = (code == 'h') ? 0 : 4;
int first = 1;
char *v;
val = argv[currentarg++];
convert_to_string(val);
v = val->value.str.val;
outputpos--;
while (arg-- > 0) {
char n = *(v++);
if ((n >= '0') && (n <= '9')) {
n -= '0';
} else if ((n >= 'A') && (n <= 'F')) {
n -= ('A' - 10);
} else if ((n >= 'a') && (n <= 'f')) {
n -= ('a' - 10);
} else {
php3_error(E_WARNING, "pack type %c: illegal hex digit %c", code, n);
n = 0;
}
if (first--) {
output[++outputpos] = 0;
} else {
first = 1;
}
output[outputpos] |= (n << nibbleshift);
nibbleshift = (nibbleshift + 4) & 7;
}
outputpos++;
break;
}
case 'c': case 'C': {
while (arg-- > 0) {
_php3_pack(argv[currentarg++], 1, byte_map, &output[outputpos]);
outputpos++;
}
break;
}
case 's': case 'S': case 'n': case 'v': {
int *map = machine_endian_short_map;
if (code == 'n') {
map = big_endian_short_map;
} else if (code == 'v') {
map = little_endian_short_map;
}
while (arg-- > 0) {
_php3_pack(argv[currentarg++], 2, map, &output[outputpos]);
outputpos += 2;
}
break;
}
case 'i': case 'I': {
while (arg-- > 0) {
_php3_pack(argv[currentarg++], sizeof(int), int_map, &output[outputpos]);
outputpos += sizeof(int);
}
break;
}
case 'l': case 'L': case 'N': case 'V': {
int *map = machine_endian_long_map;
if (code == 'N') {
map = big_endian_long_map;
} else if (code == 'V') {
map = little_endian_long_map;
}
while (arg-- > 0) {
_php3_pack(argv[currentarg++], 4, map, &output[outputpos]);
outputpos += 4;
}
break;
}
case 'f': {
float v;
while (arg-- > 0) {
val = argv[currentarg++];
convert_to_double(val);
v = (float)val->value.dval;
memcpy(&output[outputpos], &v, sizeof(v));
outputpos += sizeof(v);
}
break;
}
case 'd': {
double v;
while (arg-- > 0) {
val = argv[currentarg++];
convert_to_double(val);
v = (double)val->value.dval;
memcpy(&output[outputpos], &v, sizeof(v));
outputpos += sizeof(v);
}
break;
}
case 'x': {
memset(&output[outputpos], '\0', arg);
outputpos += arg;
break;
}
case 'X': {
outputpos -= arg;
if (outputpos < 0) {
outputpos = 0;
}
break;
}
case '@': {
if (arg > outputpos) {
memset(&output[outputpos], '\0', arg - outputpos);
}
outputpos = arg;
break;
}
}
}
efree(argv);
efree(formatcodes);
efree(formatargs);
output[outputpos] = '\0';
RETVAL_STRINGL(output, outputpos, 1);
efree(output);
}
/* }}} */
static long _php3_unpack(char *data, int size, int issigned, int *map)
{
long result;
char *cresult = (char *)&result;
int i;
result = issigned ? -1 : 0;
for (i = 0; i < size; i++) {
cresult[map[i]] = *(data++);
}
return result;
}
/* unpack() is based on Perl's unpack(), but is modified a bit from there.
* Rather than depending on error-prone ordered lists or syntactically
* unpleasant pass-by-reference, we return an object with named paramters
* (like *_fetch_object()). Syntax is "f[repeat]name/...", where "f" is the
* formatter char (like pack()), "[repeatt]" is the optional repeater argument,
* and "name" is the name of the variable to use.
* Example: "c2chars/nints" will return an object with fields
* chars1, chars2, and ints.
* Numeric pack types will return numbers, a and A will return strings,
* f and d will return doubles.
* Implemented formats are A,a,h,H,c,C,s,S,i,I,l,L,n,N,f,d,x,X,@.
*/
/* {{{ proto array unpack(string format, string input)
Unpack binary string into named array elements according to format argument */
PHP_FUNCTION(unpack)
{
pval *formatarg;
pval *inputarg;
char *format;
char *input;
int formatlen;
int inputpos, inputlen;
int i;
if ((ARG_COUNT(ht) != 2) || getParameters(ht, 2, &formatarg, &inputarg) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_string(formatarg);
convert_to_string(inputarg);
format = formatarg->value.str.val;
formatlen = formatarg->value.str.len;
input = inputarg->value.str.val;
inputlen = inputarg->value.str.len;
inputpos = 0;
if (array_init(return_value) == FAILURE)
return;
while (formatlen-- > 0) {
char type = *(format++);
char c;
int arg = 1;
char *name;
int namelen;
int size=0;
/* Handle format arguments if any */
if (formatlen > 0) {
c = *format;
if ((c >= '0') && (c <= '9')) {
arg = atoi(format);
while ((formatlen > 0) && (*format >= '0') && (*format <= '9')) {
format++;
formatlen--;
}
} else if (c == '*') {
arg = -1;
format++;
formatlen--;
}
}
/* Get of new value in array */
name = format;
while ((formatlen > 0) && (*format != '/')) {
formatlen--;
format++;
}
namelen = format - name;
if (namelen > 200)
namelen = 200;
switch ((int)type) {
/* Never use any input */
case 'X': {
size = -1;
break;
}
case '@': {
size = 0;
break;
}
case 'a': case 'A': case 'h': case 'H': {
size = arg;
arg = 1;
break;
}
/* Use 1 byte of input */
case 'c': case 'C': case 'x': {
size = 1;
break;
}
/* Use 2 bytes of input */
case 's': case 'S': case 'n': case 'v': {
size = 2;
break;
}
/* Use sizeof(int) bytes of input */
case 'i': case 'I': {
size = sizeof(int);
break;
}
/* Use 4 bytes of input */
case 'l': case 'L': case 'N': case 'V': {
size = 4;
break;
}
/* Use sizeof(float) bytes of input */
case 'f': {
size = sizeof(float);
break;
}
/* Use sizeof(double) bytes of input */
case 'd': {
size = sizeof(double);
break;
}
}
/* Do actual unpacking */
for (i = 0; (i != arg); i++ ) {
/* Space for name + number, safe as namelen is ensured <= 200 */
char n[256];
if (arg != 1) {
/* Need to add element number to name */
sprintf(n, "%.*s%d", namelen, name, i + 1);
} else {
/* Truncate name to next format code or end of string */
sprintf(n, "%.*s", namelen, name);
}
if ((inputpos + size) <= inputlen) {
switch ((int)type) {
case 'a': case 'A': {
char pad = (type == 'a') ? '\0' : ' ';
int len = inputlen - inputpos; /* Remaining string */
/* If size was given take minimum of len and size */
if ((size >= 0) && (len > size)) {
len = size;
}
size = len;
/* Remove padding chars from unpacked data */
while (--len >= 0) {
if (input[inputpos + len] != pad)
break;
}
add_assoc_stringl(return_value, n, &input[inputpos], len + 1, 1);
break;
}
case 'h': case 'H': {
int len = (inputlen - inputpos) * 2; /* Remaining */
int nibbleshift = (type == 'h') ? 0 : 4;
int first = 1;
char *buf;
int ipos, opos;
/* If size was given take minimum of len and size */
if ((size >= 0) && (len > size)) {
len = size;
}
size = (len + 1) / 2;
buf = emalloc(len + 1);
for (ipos = opos = 0; opos < len; opos++) {
char c = (input[inputpos + ipos] >> nibbleshift) & 0xf;
if (c < 10) {
c += '0';
} else {
c += 'a' - 10;
}
buf[opos] = c;
nibbleshift = (nibbleshift + 4) & 7;
if (first-- == 0) {
ipos++;
first = 1;
}
}
buf[len] = '\0';
add_assoc_stringl(return_value, n, buf, len, 1);
efree(buf);
break;
}
case 'c': case 'C': {
int issigned = (type == 'c') ? (input[inputpos] & 0x80) : 0;
long v = _php3_unpack(&input[inputpos], 1, issigned, byte_map);
add_assoc_long(return_value, n, v);
break;
}
case 's': case 'S': case 'n': case 'v': {
long v;
int issigned = 0;
int *map = machine_endian_short_map;
if (type == 's') {
issigned = input[inputpos + (machine_little_endian ? 1 : 0)] & 0x80;
} else if (type == 'n') {
map = big_endian_short_map;
} else if (type == 'v') {
map = little_endian_short_map;
}
v = _php3_unpack(&input[inputpos], 2, issigned, map);
add_assoc_long(return_value, n, v);
break;
}
case 'i': case 'I': {
long v;
int issigned = 0;
if (type == 'i') {
issigned = input[inputpos + (machine_little_endian ? (sizeof(int) - 1) : 0)] & 0x80;
}
v = _php3_unpack(&input[inputpos], sizeof(int), issigned, int_map);
add_assoc_long(return_value, n, v);
break;
}
case 'l': case 'L': case 'N': case 'V': {
int issigned = 0;
int *map = machine_endian_long_map;
long v;
if (type == 'l') {
issigned = input[inputpos + (machine_little_endian ? 3 : 0)] & 0x80;
} else if (type == 'N') {
map = big_endian_long_map;
} else if (type == 'V') {
map = little_endian_long_map;
}
v = _php3_unpack(&input[inputpos], 4, issigned, map);
add_assoc_long(return_value, n, v);
break;
}
case 'f': {
float v;
memcpy(&v, &input[inputpos], sizeof(float));
add_assoc_double(return_value, n, (double)v);
break;
}
case 'd': {
double v;
memcpy(&v, &input[inputpos], sizeof(float));
add_assoc_double(return_value, n, v);
break;
}
case 'x': {
/* Do nothing with input, just skip it */
break;
}
case 'X': {
if (inputpos < size) {
inputpos = -size;
i = arg - 1; /* Break out of for loop */
if (arg >= 0) {
php3_error(E_WARNING, "pack type %c: outside of string", type);
}
}
break;
}
case '@': {
if (arg <= inputlen) {
inputpos = arg;
} else {
php3_error(E_WARNING, "pack type %c: outside of string", type);
}
i = arg - 1; /* Done, break out of for loop */
break;
}
}
inputpos += size;
} else if (arg < 0) {
/* Reached end of input for '*' repeater */
break;
} else {
php3_error(E_ERROR, "pack type %c: not enough input, need %d, have %d", type, size, inputlen - inputpos);
RETURN_FALSE;
}
}
formatlen--; /* Skip '/' separator, does no harm if inputlen == 0 */
format++;
}
}
/* }}} */
int php3_minit_pack(INIT_FUNC_ARGS)
{
int machine_endian_check = 1;
int i;
machine_little_endian = ((char *)&machine_endian_check)[0];
if (machine_little_endian) {
/* Where to get lo to hi bytes from */
byte_map[0] = 0;
for (i = 0; i < sizeof(int); i++) {
int_map[i] = i;
}
machine_endian_short_map[0] = 0;
machine_endian_short_map[1] = 1;
big_endian_short_map[0] = 1;
big_endian_short_map[1] = 0;
little_endian_short_map[0] = 0;
little_endian_short_map[1] = 1;
machine_endian_long_map[0] = 0;
machine_endian_long_map[1] = 1;
machine_endian_long_map[2] = 2;
machine_endian_long_map[3] = 3;
big_endian_long_map[0] = 3;
big_endian_long_map[1] = 2;
big_endian_long_map[2] = 1;
big_endian_long_map[3] = 0;
little_endian_long_map[0] = 0;
little_endian_long_map[1] = 1;
little_endian_long_map[2] = 2;
little_endian_long_map[3] = 3;
}
else {
pval val;
int size = sizeof(val.value.lval);
val.value.lval=0; /*silence a warning*/
/* Where to get hi to lo bytes from */
byte_map[0] = size - 1;
for (i = 0; i < sizeof(int); i++) {
int_map[i] = size - (sizeof(int) - i);
}
machine_endian_short_map[0] = size - 2;
machine_endian_short_map[1] = size - 1;
big_endian_short_map[0] = size - 2;
big_endian_short_map[1] = size - 1;
little_endian_short_map[0] = size - 1;
little_endian_short_map[1] = size - 2;
machine_endian_long_map[0] = size - 4;
machine_endian_long_map[1] = size - 3;
machine_endian_long_map[2] = size - 2;
machine_endian_long_map[3] = size - 1;
big_endian_long_map[0] = size - 4;
big_endian_long_map[1] = size - 3;
big_endian_long_map[2] = size - 2;
big_endian_long_map[3] = size - 1;
little_endian_long_map[0] = size - 1;
little_endian_long_map[1] = size - 2;
little_endian_long_map[2] = size - 3;
little_endian_long_map[3] = size - 4;
}
return SUCCESS;
}
/*
* Local variables:
* tab-width: 4
* End:
*/
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