170 lines
3.2 KiB
C
170 lines
3.2 KiB
C
/*
|
|
* strfunc.c
|
|
*
|
|
* String transformation functions
|
|
*/
|
|
|
|
#include "nasmlib.h"
|
|
#include "nasm.h"
|
|
|
|
/*
|
|
* Convert a string in UTF-8 format to UTF-16LE
|
|
*/
|
|
static size_t utf8_to_16le(uint8_t *str, size_t len, char *op)
|
|
{
|
|
#define EMIT(x) do { if (op) { WRITESHORT(op,x); } outlen++; } while(0)
|
|
|
|
size_t outlen = 0;
|
|
int expect = 0;
|
|
uint8_t c;
|
|
uint32_t v = 0, vmin = 0;
|
|
|
|
while (len--) {
|
|
c = *str++;
|
|
|
|
if (expect) {
|
|
if ((c & 0xc0) != 0x80) {
|
|
expect = 0;
|
|
return -1;
|
|
} else {
|
|
v = (v << 6) | (c & 0x3f);
|
|
if (!--expect) {
|
|
if (v < vmin || v > 0x10ffff ||
|
|
(v >= 0xd800 && v <= 0xdfff)) {
|
|
return -1;
|
|
} else if (v > 0xffff) {
|
|
v -= 0x10000;
|
|
EMIT(0xd800 | (v >> 10));
|
|
EMIT(0xdc00 | (v & 0x3ff));
|
|
} else {
|
|
EMIT(v);
|
|
}
|
|
}
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (c < 0x80) {
|
|
EMIT(c);
|
|
} else if (c < 0xc0 || c >= 0xfe) {
|
|
/* Invalid UTF-8 */
|
|
return -1;
|
|
} else if (c < 0xe0) {
|
|
v = c & 0x1f;
|
|
expect = 1;
|
|
vmin = 0x80;
|
|
} else if (c < 0xf0) {
|
|
v = c & 0x0f;
|
|
expect = 2;
|
|
vmin = 0x800;
|
|
} else if (c < 0xf8) {
|
|
v = c & 0x07;
|
|
expect = 3;
|
|
vmin = 0x10000;
|
|
} else if (c < 0xfc) {
|
|
v = c & 0x03;
|
|
expect = 4;
|
|
vmin = 0x200000;
|
|
} else {
|
|
v = c & 0x01;
|
|
expect = 5;
|
|
vmin = 0x4000000;
|
|
}
|
|
}
|
|
|
|
return expect ? (size_t)-1 : outlen << 1;
|
|
|
|
#undef EMIT
|
|
}
|
|
|
|
/*
|
|
* Convert a string in UTF-8 format to UTF-32LE
|
|
*/
|
|
static size_t utf8_to_32le(uint8_t *str, size_t len, char *op)
|
|
{
|
|
#define EMIT(x) do { if (op) { WRITELONG(op,x); } outlen++; } while(0)
|
|
|
|
size_t outlen = 0;
|
|
int expect = 0;
|
|
uint8_t c;
|
|
uint32_t v = 0, vmin = 0;
|
|
|
|
while (len--) {
|
|
c = *str++;
|
|
|
|
if (expect) {
|
|
if ((c & 0xc0) != 0x80) {
|
|
return -1;
|
|
} else {
|
|
v = (v << 6) | (c & 0x3f);
|
|
if (!--expect) {
|
|
if (v < vmin || (v >= 0xd800 && v <= 0xdfff)) {
|
|
return -1;
|
|
} else {
|
|
EMIT(v);
|
|
}
|
|
}
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (c < 0x80) {
|
|
EMIT(c);
|
|
} else if (c < 0xc0 || c >= 0xfe) {
|
|
/* Invalid UTF-8 */
|
|
return -1;
|
|
} else if (c < 0xe0) {
|
|
v = c & 0x1f;
|
|
expect = 1;
|
|
vmin = 0x80;
|
|
} else if (c < 0xf0) {
|
|
v = c & 0x0f;
|
|
expect = 2;
|
|
vmin = 0x800;
|
|
} else if (c < 0xf8) {
|
|
v = c & 0x07;
|
|
expect = 3;
|
|
vmin = 0x10000;
|
|
} else if (c < 0xfc) {
|
|
v = c & 0x03;
|
|
expect = 4;
|
|
vmin = 0x200000;
|
|
} else {
|
|
v = c & 0x01;
|
|
expect = 5;
|
|
vmin = 0x4000000;
|
|
}
|
|
}
|
|
|
|
return expect ? (size_t)-1 : outlen << 2;
|
|
|
|
#undef EMIT
|
|
}
|
|
|
|
typedef size_t (*transform_func)(uint8_t *, size_t, char *);
|
|
|
|
/*
|
|
* Apply a specific string transform and return it in a nasm_malloc'd
|
|
* buffer, returning the length. On error, returns (size_t)-1 and no
|
|
* buffer is allocated.
|
|
*/
|
|
size_t string_transform(char *str, size_t len, char **out, enum strfunc func)
|
|
{
|
|
/* This should match enum strfunc in nasm.h */
|
|
static const transform_func str_transforms[] = {
|
|
utf8_to_16le,
|
|
utf8_to_32le,
|
|
};
|
|
transform_func transform = str_transforms[func];
|
|
size_t outlen;
|
|
uint8_t *s = (uint8_t *)str;
|
|
char *buf;
|
|
|
|
outlen = transform(s, len, NULL);
|
|
if (outlen == (size_t)-1)
|
|
return -1;
|
|
|
|
*out = buf = nasm_malloc(outlen+1);
|
|
buf[outlen] = '\0'; /* Forcibly null-terminate the buffer */
|
|
return transform(s, len, buf);
|
|
}
|