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#include "sys/encoding.h"
#include "base/allocator.h"
#include <stdbool.h>
#include <string.h>
static bool
utf8_codepoint(const unsigned char *input, size_t length, size_t *used, uint32_t *codepoint)
{
const unsigned char first = input[0];
size_t width, index;
uint32_t value;
if (first < 0x80)
{
width = 1;
value = first;
}
else if (first >= 0xc2 && first <= 0xdf)
{
width = 2;
value = first & 0x1f;
}
else if (first >= 0xe0 && first <= 0xef)
{
width = 3;
value = first & 0x0f;
}
else if (first >= 0xf0 && first <= 0xf4)
{
width = 4;
value = first & 0x07;
}
else
{
return false;
}
if (width > length)
{
return false;
}
for (index = 1; index < width; ++index)
{
if ((input[index] & 0xc0) != 0x80)
{
return false;
}
value = (value << 6) | (input[index] & 0x3f);
}
if ((width == 3 && ((first == 0xe0 && input[1] < 0xa0) || (first == 0xed && input[1] >= 0xa0)))
|| (width == 4
&& ((first == 0xf0 && input[1] < 0x90) || (first == 0xf4 && input[1] >= 0x90))))
{
return false;
}
*used = width;
*codepoint = value;
return true;
}
tiny_encoding_status_t
tiny_utf8_to_utf16(const char *input, size_t input_length, uint16_t **output, size_t *output_length)
{
size_t offset = 0, units = 0;
uint16_t *result;
if (output == NULL || output_length == NULL)
{
return TINY_ENCODING_INVALID;
}
*output = NULL;
*output_length = 0;
if (input == NULL && input_length != 0)
{
return TINY_ENCODING_INVALID;
}
while (offset < input_length)
{
size_t used;
uint32_t point;
if (!utf8_codepoint(
(const unsigned char *)input + offset, input_length - offset, &used, &point))
{
return TINY_ENCODING_INVALID;
}
if (units > SIZE_MAX - (point >= 0x10000 ? 2U : 1U))
{
return TINY_ENCODING_OVERFLOW;
}
units += point >= 0x10000 ? 2U : 1U;
offset += used;
}
if (units == SIZE_MAX || units + 1 > SIZE_MAX / sizeof(*result))
{
return TINY_ENCODING_OVERFLOW;
}
result = malloc((units + 1) * sizeof(*result));
if (result == NULL)
{
return TINY_ENCODING_NO_MEMORY;
}
offset = 0;
units = 0;
while (offset < input_length)
{
size_t used;
uint32_t point;
(void)utf8_codepoint(
(const unsigned char *)input + offset, input_length - offset, &used, &point);
if (point < 0x10000)
{
result[units++] = (uint16_t)point;
}
else
{
point -= 0x10000;
result[units++] = (uint16_t)(0xd800 + (point >> 10));
result[units++] = (uint16_t)(0xdc00 + (point & 0x3ff));
}
offset += used;
}
result[units] = 0;
*output = result;
*output_length = units;
return TINY_ENCODING_OK;
}
tiny_encoding_status_t
tiny_utf16_to_utf8(const uint16_t *input, size_t input_length, char **output, size_t *output_length)
{
size_t index = 0, bytes = 0;
char *result;
if (output == NULL || output_length == NULL)
{
return TINY_ENCODING_INVALID;
}
*output = NULL;
*output_length = 0;
if (input == NULL && input_length != 0)
{
return TINY_ENCODING_INVALID;
}
while (index < input_length)
{
uint32_t point = input[index++];
if (point >= 0xd800 && point <= 0xdbff)
{
if (index >= input_length || input[index] < 0xdc00 || input[index] > 0xdfff)
{
return TINY_ENCODING_INVALID;
}
point = 0x10000 + ((point - 0xd800) << 10) + (input[index++] - 0xdc00);
}
else if (point >= 0xdc00 && point <= 0xdfff)
{
return TINY_ENCODING_INVALID;
}
if (bytes > SIZE_MAX - (point < 0x80 ? 1U : point < 0x800 ? 2U : point < 0x10000 ? 3U : 4U))
{
return TINY_ENCODING_OVERFLOW;
}
bytes += point < 0x80 ? 1U : point < 0x800 ? 2U : point < 0x10000 ? 3U : 4U;
}
if (bytes == SIZE_MAX)
{
return TINY_ENCODING_OVERFLOW;
}
result = malloc(bytes + 1);
if (result == NULL)
{
return TINY_ENCODING_NO_MEMORY;
}
index = 0;
bytes = 0;
while (index < input_length)
{
uint32_t point = input[index++];
if (point >= 0xd800 && point <= 0xdbff)
{
point = 0x10000 + ((point - 0xd800) << 10) + (input[index++] - 0xdc00);
}
if (point < 0x80)
{
result[bytes++] = (char)point;
}
else if (point < 0x800)
{
result[bytes++] = (char)(0xc0 | (point >> 6));
result[bytes++] = (char)(0x80 | (point & 0x3f));
}
else if (point < 0x10000)
{
result[bytes++] = (char)(0xe0 | (point >> 12));
result[bytes++] = (char)(0x80 | ((point >> 6) & 0x3f));
result[bytes++] = (char)(0x80 | (point & 0x3f));
}
else
{
result[bytes++] = (char)(0xf0 | (point >> 18));
result[bytes++] = (char)(0x80 | ((point >> 12) & 0x3f));
result[bytes++] = (char)(0x80 | ((point >> 6) & 0x3f));
result[bytes++] = (char)(0x80 | (point & 0x3f));
}
}
result[bytes] = '\0';
*output = result;
*output_length = bytes;
return TINY_ENCODING_OK;
}
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