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Decompile interface font byte swap functions 

See #17
This commit is contained in:
Alexander Batalov 2022-05-28 21:39:47 +03:00
parent 14ce3994ce
commit 220fb1a196
2 changed files with 47 additions and 8 deletions
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51
src/font_manager.cc
View File

@ -94,32 +94,32 @@ int interfaceFontLoad(int font_index)
int sig; int sig;
if (fileRead(&sig, 4, 1, stream) != 1) goto err; if (fileRead(&sig, 4, 1, stream) != 1) goto err;
sig = _byteswap_ulong(sig); interfaceFontByteSwapInt32(&sig);
if (sig != 0x41414646) goto err; if (sig != 0x41414646) goto err;
if (fileRead(&(fontDescriptor->field_0), 2, 1, stream) != 1) goto err; if (fileRead(&(fontDescriptor->field_0), 2, 1, stream) != 1) goto err;
fontDescriptor->field_0 = _byteswap_ushort(fontDescriptor->field_0); interfaceFontByteSwapInt16(&(fontDescriptor->field_0));
if (fileRead(&(fontDescriptor->letterSpacing), 2, 1, stream) != 1) goto err; if (fileRead(&(fontDescriptor->letterSpacing), 2, 1, stream) != 1) goto err;
fontDescriptor->letterSpacing = _byteswap_ushort(fontDescriptor->letterSpacing); interfaceFontByteSwapInt16(&(fontDescriptor->letterSpacing));
if (fileRead(&(fontDescriptor->wordSpacing), 2, 1, stream) != 1) goto err; if (fileRead(&(fontDescriptor->wordSpacing), 2, 1, stream) != 1) goto err;
fontDescriptor->wordSpacing = _byteswap_ushort(fontDescriptor->wordSpacing); interfaceFontByteSwapInt16(&(fontDescriptor->wordSpacing));
if (fileRead(&(fontDescriptor->field_6), 2, 1, stream) != 1) goto err; if (fileRead(&(fontDescriptor->field_6), 2, 1, stream) != 1) goto err;
fontDescriptor->field_6 = _byteswap_ushort(fontDescriptor->field_6); interfaceFontByteSwapInt16(&(fontDescriptor->field_6));
for (int index = 0; index < 256; index++) { for (int index = 0; index < 256; index++) {
InterfaceFontGlyph* glyph = &(fontDescriptor->glyphs[index]); InterfaceFontGlyph* glyph = &(fontDescriptor->glyphs[index]);
if (fileRead(&(glyph->width), 2, 1, stream) != 1) goto err; if (fileRead(&(glyph->width), 2, 1, stream) != 1) goto err;
glyph->width = _byteswap_ushort(glyph->width); interfaceFontByteSwapInt16(&(glyph->width));
if (fileRead(&(glyph->field_2), 2, 1, stream) != 1) goto err; if (fileRead(&(glyph->field_2), 2, 1, stream) != 1) goto err;
glyph->field_2 = _byteswap_ushort(glyph->field_2); interfaceFontByteSwapInt16(&(glyph->field_2));
if (fileRead(&(glyph->field_4), 4, 1, stream) != 1) goto err; if (fileRead(&(glyph->field_4), 4, 1, stream) != 1) goto err;
glyph->field_4 = _byteswap_ulong(glyph->field_4); interfaceFontByteSwapInt32(&(glyph->field_4));
} }
fileSize -= sizeof(InterfaceFontDescriptor); fileSize -= sizeof(InterfaceFontDescriptor);
@ -335,3 +335,38 @@ void interfaceFontDrawImpl(unsigned char* buf, const char* string, int length, i
_freeColorBlendTable(color & 0xFF); _freeColorBlendTable(color & 0xFF);
} }
// NOTE: Inlined.
//
// 0x442520
void interfaceFontByteSwapUInt32(unsigned int* value)
{
unsigned int swapped = *value;
unsigned short high = swapped >> 16;
// NOTE: Uninline.
interfaceFontByteSwapUInt16(&high);
unsigned short low = swapped & 0xFFFF;
// NOTE: Uninline.
interfaceFontByteSwapUInt16(&low);
*value = (low << 16) | high;
}
// NOTE: 0x442520 with different signature.
void interfaceFontByteSwapInt32(int* value)
{
interfaceFontByteSwapUInt32((unsigned int*)value);
}
// 0x442568
void interfaceFontByteSwapUInt16(unsigned short* value)
{
unsigned short swapped = *value;
swapped = (swapped >> 8) | (swapped << 8);
*value = swapped;
}
// NOTE: 0x442568 with different signature.
void interfaceFontByteSwapInt16(short* value)
{
interfaceFontByteSwapUInt16((unsigned short*)value);
}

4
src/font_manager.h
View File

@ -43,5 +43,9 @@ int interfaceFontGetLetterSpacingImpl();
int interfaceFontGetBufferSizeImpl(const char* string); int interfaceFontGetBufferSizeImpl(const char* string);
int interfaceFontGetMonospacedCharacterWidthImpl(); int interfaceFontGetMonospacedCharacterWidthImpl();
void interfaceFontDrawImpl(unsigned char* buf, const char* string, int length, int pitch, int color); void interfaceFontDrawImpl(unsigned char* buf, const char* string, int length, int pitch, int color);
void interfaceFontByteSwapUInt32(unsigned int* value);
void interfaceFontByteSwapInt32(int* value);
void interfaceFontByteSwapUInt16(unsigned short* value);
void interfaceFontByteSwapInt16(short* value);
#endif /* FONT_MANAGER_H */ #endif /* FONT_MANAGER_H */