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#include "usuals.h"
#include "ntfs.h"
/*
* Transcode UCS2 to UTF8.
*
* Since the nature of the transformation is that the
* resulting length is unpredictable, this function
* allocates it's own memory.
*/
char* unicode_transcode16to8(const ntfs_char* src, size_t len)
{
char* ret = NULL;
size_t alloc = 0;
size_t pos = 0;
const ntfs_char* c;
const ntfs_char* e;
/* Allocate 1.25 times the length initially */
alloc = len + (len / 4) + 1;
ret = (char*)mallocf(alloc * sizeof(char));
c = src;
e = c + len;
for( ; c < e; c++)
{
/* Make sure we have enough memory */
if(pos + 4 >= alloc)
{
alloc += (len / 2) + 1;
ret = (char*)reallocf(ret, alloc * sizeof(char));
}
/* Encode as one character */
if(*c <= 0x007F)
{
ret[pos++] = (char)*c;
}
/* Encode as two characters */
else if(*c <= 0x07FF)
{
ret[pos++] = (char)(192 | (*c >> 6));
ret[pos++] = (char)(128 | (*c & 63));
}
/* Encode as three characters */
else
{
ret[pos++] = (char)(224 | (*c >> 12));
ret[pos++] = (char)(128 | ((*c >> 6) & 63));
ret[pos++] = (char)(128 | (*c & 63));
}
}
ret[pos] = 0;
return ret;
}
/*
* Transcode UTF-8 to UCS2
*
* Since a semi predictable length of the resulting data is
* known, the caller should allocate the memory for this conversion.
*/
ntfs_char* unicode_transcode8to16(const char* src, ntfs_char* out, size_t len)
{
/* Note: out should always be at least as long as src in chars */
size_t pos = 0;
const char* c;
const char* e;
c = src;
e = c + len;
for( ; c < e; c++)
{
/* We never have to reallocate here. We will always
be using the same or less number of output characters
than input chars. That's just the nature of the encoding. */
/* First 4 bits set */
if((c + 3) < e &&
(c[0] & 0xF8) == 0xF0 &&
(c[1] & 0xC0) == 0x80 &&
(c[2] & 0xC0) == 0x80 &&
(c[3] & 0xC0) == 0x80)
{
out[pos++] = (ntfs_char)(((ntfs_char)c[0] & 7) << 18 |
((ntfs_char)c[1] & 63) << 12 |
((ntfs_char)c[2] & 63) << 6 |
((ntfs_char)c[3] & 63));
c += 3;
}
/* First 3 bits set */
else if((c + 2) < e &&
(c[0] & 0xF0) == 0xE0 &&
(c[1] & 0xC0) == 0x80 &&
(c[2] & 0xC0) == 0x80)
{
out[pos++] = (ntfs_char)(((ntfs_char)c[0] & 15) << 12 |
((ntfs_char)c[1] & 63) << 6 |
((ntfs_char)c[2] & 63));
c += 2;
}
/* First 2 bits set */
else if((c + 1) < e &&
(c[0] & 0xE0) == 0xC0 &&
(c[1] & 0xC0) == 0x80)
{
out[pos++] = (ntfs_char)(((ntfs_char)c[0] & 31) << 6 |
((ntfs_char)c[1] & 63));
c += 1;
}
/* First bit set */
else if(!(c[0] & 0x80))
{
out[pos++] = (ntfs_char)c[0];
}
/* Invalid encoding */
else
{
out[pos++] = L'?';
}
}
out[pos] = 0;
return out;
}
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