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#include <stdlib.h>
#include <stdio.h>
#include <stdio.h>
#include <locale.h>
#include <assert.h>
#include <wchar.h>
#include <stdint.h>
typedef uint8_t u8;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;
typedef int8_t s8;
typedef int16_t s16;
typedef int32_t s32;
typedef int64_t s64;
static size_t
UTF8Compress(size_t InSize, wchar_t* In, size_t OutSize, u8* OutBase)
{
wchar_t* InEnd = (wchar_t*)((u8*)In + InSize);
u8* Out = OutBase;
#define MAX_LITERAL_COUNT 255
u8 ASCIILiterals[MAX_LITERAL_COUNT] = {0};
u8 ASCIILiteralsCount = 0;
wchar_t UTF8Literals[MAX_LITERAL_COUNT] = {0};
u8 UTF8LiteralsCount = 0;
while (In < InEnd)
{
wchar_t CurrentChar = In[0];
// Check consecutive ascii characters
while(CurrentChar == (u8)CurrentChar &&
ASCIILiteralsCount < MAX_LITERAL_COUNT)
{
ASCIILiterals[ASCIILiteralsCount++] = (u8)CurrentChar;
CurrentChar = *++In;
}
while(CurrentChar != (u8)CurrentChar &&
UTF8LiteralsCount < MAX_LITERAL_COUNT)
{
UTF8Literals[UTF8LiteralsCount++] = CurrentChar;
CurrentChar = *++In;
}
// Encode ASCII/UTF8 pair
*Out++ = ASCIILiteralsCount;
for (u8 ch = 0;
ch < ASCIILiteralsCount;
ch++)
{
*Out = ASCIILiterals[ch];
Out += sizeof(ASCIILiterals[ch]);
}
ASCIILiteralsCount = 0;
*Out++ = UTF8LiteralsCount;
for (u8 ch = 0;
ch < UTF8LiteralsCount;
ch++)
{
*(wchar_t*)Out = UTF8Literals[ch];
Out += sizeof(UTF8Literals[ch]);
}
UTF8LiteralsCount = 0;
}
#undef MAX_LITERAL_COUNT
assert(In == InEnd);
return Out - OutBase;
}
static void
PrintCompressedUTF8(u8* In, size_t InSize)
{
u8* InEnd = In + InSize;
while (In < InEnd)
{
u8 ASCIICount = *In++;
wprintf(L"%dA(\"", ASCIICount);
while(ASCIICount--)
{
wprintf(L"%c", *In);
In += sizeof(u8);
}
wprintf(L"\") ");
u8 UTF8Count = *In++;
wprintf(L"%dU(\"", UTF8Count);
while(UTF8Count--)
{
wprintf(L"%lc", *(wchar_t*)In);
In += sizeof(wchar_t);
}
wprintf(L"\") ");
}
wprintf(L"\n");
assert(In == InEnd);
}
static void
UTF8Decompress(size_t InSize, u8* In, size_t OutSize, wchar_t* Out)
{
u8* InEnd = In + InSize;
while (In < InEnd)
{
u8 ASCIICount = *In++;
while(ASCIICount--)
{
*Out++ = *In++;
}
u8 UTF8Count = *In++;
while(UTF8Count--)
{
*Out++ = *(wchar_t*)In;
In += sizeof(wchar_t);
}
}
assert(In == InEnd);
}
// Size is the size of the UTF8 string in bytes. "aaa" would be 12.
size_t
UTF8GetMaximumCompressedSize(size_t Size)
{
// The largest would be if there was only one unicode point in which case we store 0 for ascii 1
// for unicode and the raw codepoint. 1 + 1 + 4 * CodepointNum
return Size + 2;
}
int
main(int Argc, char* Argv[]) {
assert(setlocale(LC_ALL, "") != 0);
wchar_t* InBuf = L"text│tt│";
size_t InSize = wcslen(InBuf) * 4;
size_t OutSize = UTF8GetMaximumCompressedSize(InSize);
u8 OutBuf[OutSize];
size_t CompressedSize = UTF8Compress(InSize, InBuf, OutSize, OutBuf);
fwprintf(stderr, L"Raw string: \"%ls\"\n", InBuf);
fwprintf(stderr, L"Compressed %lu bytes -> %lu bytes.\n", InSize, CompressedSize);
size_t DecompressedSize = InSize;
wchar_t *DecompressedBuffer = malloc(DecompressedSize);
UTF8Decompress(CompressedSize, OutBuf, DecompressedSize, DecompressedBuffer);
fwprintf(stderr, L"Decompressed: \"%ls\"\n", DecompressedBuffer);
PrintCompressedUTF8(OutBuf, CompressedSize);
return 0;
}
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