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#include <string.h>
#include <jim.h>
/* Provides the [pack] and [unpack] commands to pack and unpack
* a binary string to/from arbitrary width integers and strings.
*
* This may be used to implement the [binary] command.
*/
/**
* Big endian bit test.
*
* Considers 'bitvect' as a big endian bit stream and returns
* bit 'b' as zero or non-zero.
*/
static int JimTestBitBigEndian(const unsigned char *bitvec, int b)
{
div_t pos = div(b, 8);
return bitvec[pos.quot] & (1 << (7 - pos.rem));
}
/**
* Little endian bit test.
*
* Considers 'bitvect' as a little endian bit stream and returns
* bit 'b' as zero or non-zero.
*/
static int JimTestBitLittleEndian(const unsigned char *bitvec, int b)
{
div_t pos = div(b, 8);
return bitvec[pos.quot] & (1 << pos.rem);
}
/**
* Sign extends the given value, 'n' of width 'width' bits.
*
* For example, sign extending 0x80 with a width of 8, produces -128
*/
static jim_wide JimSignExtend(jim_wide n, int width)
{
if (width == sizeof(jim_wide) * 8) {
/* Can't sign extend the maximum size integer */
return n;
}
if (n & ((jim_wide)1 << (width - 1))) {
/* Need to extend */
n -= ((jim_wide)1 << width);
}
return n;
}
/**
* Big endian integer extraction.
*
* Considers 'bitvect' as a big endian bit stream.
* Returns an integer of the given width (in bits)
* starting at the given position (in bits).
*
* The pos/width must represent bits inside bitvec,
* and the width be no more than the width of jim_wide.
*/
static jim_wide JimBitIntBigEndian(const unsigned char *bitvec, int pos, int width)
{
jim_wide result = 0;
int i;
/* Aligned, byte extraction */
if (pos % 8 == 0 && width % 8 == 0) {
for (i = 0; i < width; i += 8) {
result = (result << 8) + bitvec[(pos + i) / 8];
}
return result;
}
/* Unaligned */
for (i = 0; i < width; i++) {
if (JimTestBitBigEndian(bitvec, pos + width - i - 1)) {
result |= ((jim_wide)1 << i);
}
}
return result;
}
/**
* Little endian integer extraction.
*
* Like JimBitIntBigEndian() but considers 'bitvect' as a little endian bit stream.
*/
static jim_wide JimBitIntLittleEndian(const unsigned char *bitvec, int pos, int width)
{
jim_wide result = 0;
int i;
/* Aligned, byte extraction */
if (pos % 8 == 0 && width % 8 == 0) {
for (i = 0; i < width; i += 8) {
result += (jim_wide)bitvec[(pos + i) / 8] << i;
}
return result;
}
/* Unaligned */
for (i = 0; i < width; i++) {
if (JimTestBitLittleEndian(bitvec, pos + i)) {
result |= ((jim_wide)1 << i);
}
}
return result;
}
/**
* Big endian bit set.
*
* Considers 'bitvect' as a big endian bit stream and sets
* bit 'b' to 'bit'
*/
static void JimSetBitBigEndian(unsigned char *bitvec, int b, int bit)
{
div_t pos = div(b, 8);
if (bit) {
bitvec[pos.quot] |= (1 << (7 - pos.rem));
}
else {
bitvec[pos.quot] &= ~(1 << (7 - pos.rem));
}
}
/**
* Little endian bit set.
*
* Considers 'bitvect' as a little endian bit stream and sets
* bit 'b' to 'bit'
*/
static void JimSetBitLittleEndian(unsigned char *bitvec, int b, int bit)
{
div_t pos = div(b, 8);
if (bit) {
bitvec[pos.quot] |= (1 << pos.rem);
}
else {
bitvec[pos.quot] &= ~(1 << pos.rem);
}
}
/**
* Big endian integer packing.
*
* Considers 'bitvect' as a big endian bit stream.
* Packs integer 'value' of the given width (in bits)
* starting at the given position (in bits).
*
* The pos/width must represent bits inside bitvec,
* and the width be no more than the width of jim_wide.
*/
static void JimSetBitsIntBigEndian(unsigned char *bitvec, jim_wide value, int pos, int width)
{
int i;
/* Common fast option */
if (pos % 8 == 0 && width == 8) {
bitvec[pos / 8] = value;
return;
}
for (i = 0; i < width; i++) {
int bit = !!(value & ((jim_wide)1 << i));
JimSetBitBigEndian(bitvec, pos + width - i - 1, bit);
}
}
/**
* Little endian version of JimSetBitsIntBigEndian()
*/
static void JimSetBitsIntLittleEndian(unsigned char *bitvec, jim_wide value, int pos, int width)
{
int i;
/* Common fast option */
if (pos % 8 == 0 && width == 8) {
bitvec[pos / 8] = value;
return;
}
for (i = 0; i < width; i++) {
int bit = !!(value & ((jim_wide)1 << i));
JimSetBitLittleEndian(bitvec, pos + i, bit);
}
}
/**
* Binary conversion of jim_wide integer to float
*
* Considers the least significant bits of
* jim_wide 'value' as a IEEE float.
*
* Should work for both little- and big-endian platforms.
*/
static float JimIntToFloat(jim_wide value)
{
int offs;
float val;
/* Skip offs to get to least significant bytes */
offs = Jim_IsBigEndian() ? (sizeof(jim_wide) - sizeof(float)) : 0;
memcpy(&val, (unsigned char *) &value + offs, sizeof(float));
return val;
}
/**
* Binary conversion of jim_wide integer to double
*
* Double precision version of JimIntToFloat
*/
static double JimIntToDouble(jim_wide value)
{
int offs;
double val;
/* Skip offs to get to least significant bytes */
offs = Jim_IsBigEndian() ? (sizeof(jim_wide) - sizeof(double)) : 0;
memcpy(&val, (unsigned char *) &value + offs, sizeof(double));
return val;
}
/**
* Binary conversion of float to jim_wide integer
*
* Considers the bits of IEEE float 'value' as integer.
* The integer is zero-extended to jim_wide.
*
* Should work for both little- and big-endian platforms.
*/
static jim_wide JimFloatToInt(float value)
{
int offs;
jim_wide val = 0;
/* Skip offs to get to least significant bytes */
offs = Jim_IsBigEndian() ? (sizeof(jim_wide) - sizeof(float)) : 0;
memcpy((unsigned char *) &val + offs, &value, sizeof(float));
return val;
}
/**
* Binary conversion of double to jim_wide integer
*
* Double precision version of JimFloatToInt
*/
static jim_wide JimDoubleToInt(double value)
{
int offs;
jim_wide val = 0;
/* Skip offs to get to least significant bytes */
offs = Jim_IsBigEndian() ? (sizeof(jim_wide) - sizeof(double)) : 0;
memcpy((unsigned char *) &val + offs, &value, sizeof(double));
return val;
}
/**
* [unpack]
*
* Usage: unpack binvalue -intbe|-intle|-uintbe|-uintle|-floatbe|-floatle|-str bitpos bitwidth
*
* Unpacks bits from $binvalue at bit position $bitpos and with $bitwidth.
* Interprets the value according to the type and returns it.
*/
static int Jim_UnpackCmd(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
int option;
static const char * const options[] = { "-intbe", "-intle", "-uintbe", "-uintle",
"-floatbe", "-floatle", "-str", NULL };
enum { OPT_INTBE, OPT_INTLE, OPT_UINTBE, OPT_UINTLE, OPT_FLOATBE, OPT_FLOATLE, OPT_STR, };
jim_wide pos;
jim_wide width;
if (argc != 5) {
Jim_WrongNumArgs(interp, 1, argv,
"binvalue -intbe|-intle|-uintbe|-uintle|-floatbe|-floatle|-str bitpos bitwidth");
return JIM_ERR;
}
if (Jim_GetEnum(interp, argv[2], options, &option, NULL, JIM_ERRMSG) != JIM_OK) {
return JIM_ERR;
}
if (Jim_GetWideExpr(interp, argv[3], &pos) != JIM_OK) {
return JIM_ERR;
}
if (pos < 0 || (option == OPT_STR && pos % 8)) {
Jim_SetResultFormatted(interp, "bad bitoffset: %#s", argv[3]);
return JIM_ERR;
}
if (Jim_GetWideExpr(interp, argv[4], &width) != JIM_OK) {
return JIM_ERR;
}
if (width < 0 || (option == OPT_STR && width % 8) || (option != OPT_STR && width > sizeof(jim_wide) * 8) ||
((option == OPT_FLOATLE || option == OPT_FLOATBE) && width != 32 && width != 64)) {
Jim_SetResultFormatted(interp, "bad bitwidth: %#s", argv[4]);
return JIM_ERR;
}
if (option == OPT_STR) {
int len;
const char *str = Jim_GetString(argv[1], &len);
if (pos < len * 8) {
if (pos + width > len * 8) {
width = len * 8 - pos;
}
Jim_SetResultString(interp, str + pos / 8, width / 8);
}
return JIM_OK;
}
else {
int len;
const unsigned char *str = (const unsigned char *)Jim_GetString(argv[1], &len);
jim_wide result = 0;
if (pos < len * 8) {
if (pos + width > len * 8) {
width = len * 8 - pos;
}
if (option == OPT_INTBE || option == OPT_UINTBE || option == OPT_FLOATBE) {
result = JimBitIntBigEndian(str, pos, width);
}
else {
result = JimBitIntLittleEndian(str, pos, width);
}
if (option == OPT_INTBE || option == OPT_INTLE) {
result = JimSignExtend(result, width);
}
}
if (option == OPT_FLOATBE || option == OPT_FLOATLE) {
double fresult;
if (width == 32) {
fresult = (double) JimIntToFloat(result);
} else {
fresult = JimIntToDouble(result);
}
Jim_SetResult(interp, Jim_NewDoubleObj(interp, fresult));
} else {
Jim_SetResultInt(interp, result);
}
return JIM_OK;
}
}
/**
* [pack]
*
* Usage: pack varname value -intbe|-intle|-floatle|-floatbe|-str width ?bitoffset?
*
* Packs the binary representation of 'value' into the variable of the given name.
* The value is packed according to the given type, width and bitoffset.
* The variable is created if necessary (like [append])
* The variable is expanded if necessary
*/
static int Jim_PackCmd(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
int option;
static const char * const options[] = { "-intle", "-intbe", "-floatle", "-floatbe",
"-str", NULL };
enum { OPT_LE, OPT_BE, OPT_FLOATLE, OPT_FLOATBE, OPT_STR };
jim_wide pos = 0;
jim_wide width;
jim_wide value;
double fvalue;
Jim_Obj *stringObjPtr;
int len;
int freeobj = 0;
if (argc != 5 && argc != 6) {
Jim_WrongNumArgs(interp, 1, argv,
"varName value -intle|-intbe|-floatle|-floatbe|-str bitwidth ?bitoffset?");
return JIM_ERR;
}
if (Jim_GetEnum(interp, argv[3], options, &option, NULL, JIM_ERRMSG) != JIM_OK) {
return JIM_ERR;
}
if ((option == OPT_LE || option == OPT_BE) &&
Jim_GetWideExpr(interp, argv[2], &value) != JIM_OK) {
return JIM_ERR;
}
if ((option == OPT_FLOATLE || option == OPT_FLOATBE) &&
Jim_GetDouble(interp, argv[2], &fvalue) != JIM_OK) {
return JIM_ERR;
}
if (Jim_GetWideExpr(interp, argv[4], &width) != JIM_OK) {
return JIM_ERR;
}
if (width <= 0 || (option == OPT_STR && width % 8) || (option != OPT_STR && width > sizeof(jim_wide) * 8) ||
((option == OPT_FLOATLE || option == OPT_FLOATBE) && width != 32 && width != 64)) {
Jim_SetResultFormatted(interp, "bad bitwidth: %#s", argv[4]);
return JIM_ERR;
}
if (argc == 6) {
if (Jim_GetWideExpr(interp, argv[5], &pos) != JIM_OK) {
return JIM_ERR;
}
if (pos < 0 || (option == OPT_STR && pos % 8)) {
Jim_SetResultFormatted(interp, "bad bitoffset: %#s", argv[5]);
return JIM_ERR;
}
}
stringObjPtr = Jim_GetVariable(interp, argv[1], JIM_UNSHARED);
if (!stringObjPtr) {
/* Create the string if it doesn't exist */
stringObjPtr = Jim_NewEmptyStringObj(interp);
freeobj = 1;
}
else if (Jim_IsShared(stringObjPtr)) {
freeobj = 1;
stringObjPtr = Jim_DuplicateObj(interp, stringObjPtr);
}
len = Jim_Length(stringObjPtr) * 8;
/* Extend the string as necessary first */
while (len < pos + width) {
Jim_AppendString(interp, stringObjPtr, "", 1);
len += 8;
}
Jim_SetResultInt(interp, pos + width);
/* Now set the bits. Note that the the string *must* have no non-string rep
* since we are writing the bytes directly.
*/
Jim_AppendString(interp, stringObjPtr, "", 0);
/* Convert floating point to integer if necessary */
if (option == OPT_FLOATLE || option == OPT_FLOATBE) {
/* Note that the following is slightly incompatible with Tcl behaviour.
* In Tcl floating overflow gives FLT_MAX (cf. test binary-13.13).
* In Jim Tcl it gives Infinity. This behavior may change.
*/
value = (width == 32) ? JimFloatToInt((float)fvalue) : JimDoubleToInt(fvalue);
}
if (option == OPT_BE || option == OPT_FLOATBE) {
JimSetBitsIntBigEndian((unsigned char *)stringObjPtr->bytes, value, pos, width);
}
else if (option == OPT_LE || option == OPT_FLOATLE) {
JimSetBitsIntLittleEndian((unsigned char *)stringObjPtr->bytes, value, pos, width);
}
else {
pos /= 8;
width /= 8;
if (width > Jim_Length(argv[2])) {
width = Jim_Length(argv[2]);
}
memcpy(stringObjPtr->bytes + pos, Jim_String(argv[2]), width);
/* No padding is needed since the string is already extended */
}
if (Jim_SetVariable(interp, argv[1], stringObjPtr) != JIM_OK) {
if (freeobj) {
Jim_FreeNewObj(interp, stringObjPtr);
return JIM_ERR;
}
}
return JIM_OK;
}
int Jim_packInit(Jim_Interp *interp)
{
Jim_PackageProvideCheck(interp, "pack");
Jim_CreateCommand(interp, "unpack", Jim_UnpackCmd, NULL, NULL);
Jim_CreateCommand(interp, "pack", Jim_PackCmd, NULL, NULL);
return JIM_OK;
}
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