denuvo-ref/precomp-cpp
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Merge pull request #79 from MarcioPais/master

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Improve JPEG parsing
This commit is contained in:
Christian Schneider 2018-03-16 13:20:09 +01:00 • committed by GitHub
commit 378d5bf7c9
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1 changed files with 23 additions and 3 deletions
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26
precomp.cpp
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@ -4292,6 +4292,7 @@ bool compress_file(float min_percent, float max_percent) {
saved_cb = cb;
bool done = false, found = false;
bool hasQuantTable = (in_buf[cb + 3] == 0xDB);
bool progressive_flag = (in_buf[cb + 3] == 0xC2);
input_file_pos+=2;
@ -4299,13 +4300,32 @@ bool compress_file(float min_percent, float max_percent) {
seek_64(fin, input_file_pos );
if ((fread(in, 1, 5, fin) != 5) || (in[0] != 0xFF))
break;
int length = (int)in[2]*256+(int)in[3];
switch (in[1]){
case 0xDA : found = true;
case 0xDB : {
// FF DB XX XX QtId ...
// Marker length (XX XX) must be = 2 + (multiple of 65 <= 260)
// QtId:
// bit 0..3: number of QT (0..3, otherwise error)
// bit 4..7: precision of QT, 0 = 8 bit, otherwise 16 bit
if (length<=262 && ((length-2)%65)==0 && in[4]<=3) {
hasQuantTable = true;
input_file_pos += length+2;
}
else
done = true;
break;
}
case 0xC4 : {
done = ((in[4]&0xF)>3 || (in[4]>>4)>1);
input_file_pos += length+2;
break;
}
case 0xDA : found = hasQuantTable;
case 0xD9 : done = true; break; //EOI with no SOS?
case 0xC2 : progressive_flag = true;
case 0xC0 : done = (in[4] != 0x08);
default: input_file_pos += in[2]*256+in[3]+2;
default: input_file_pos += length+2;
}
}
while (!done);