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Refactor cheat decoding, add support for Master System cheats.

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This commit is contained in:
iLag 2017-03-25 15:26:40 -07:00
parent 7093f1b7b2
commit 929d8bd723
1 changed files with 163 additions and 121 deletions
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134
libretro/libretro.c
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@ -1190,14 +1190,13 @@ static uint32_t decode_cheat(char *string, int index)
uint32_t address = 0;
uint16_t data = 0;
uint8_t ref = 0;
/* 16-bit Game Genie code (ABCD-EFGH) */
if ((system_hw & SYSTEM_PBC) == SYSTEM_MD){
//If system is Genesis-based
//Game-Genie
if ((strlen(string) >= 9) && (string[4] == '-'))
{
/* 16-bit system only */
if ((system_hw & SYSTEM_PBC) != SYSTEM_MD)
{
return 0;
}
for (i = 0; i < 8; i++)
{
if (i == 4) string++;
@ -1238,14 +1237,36 @@ static uint32_t decode_cheat(char *string, int index)
/* code length */
len = 9;
}
/* 8-bit Game Genie code (DDA-AAA-XXX) */
else if ((strlen(string) >= 11) && (string[3] == '-') && (string[7] == '-'))
//Patch and PAR
else if ((strlen(string) >=9) && (string[6] == ':'))
{
/* 8-bit system only */
if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
/* decode 24-bit address */
for (i=0; i<6; i++)
{
return 0;
p = strchr (arvalidchars, *string++);
if (p == NULL) return 0;
n = (p - arvalidchars) & 0xF;
address |= (n << ((5 - i) * 4));
}
/* decode 16-bit data */
string++;
for (i=0; i<4; i++)
{
p = strchr (arvalidchars, *string++);
if (p == NULL) break;
n = (p - arvalidchars) & 0xF;
data |= (n << ((3 - i) * 4));
}
/* code length */
len = 11;
}
} else {
//If System is Master-based
//Game Genie
if ((strlen(string) >=11) && (string[3] == '-') && (string[7] == '-'))
{
/* decode 8-bit data */
for (i=0; i<2; i++)
{
@ -1291,39 +1312,35 @@ static uint32_t decode_cheat(char *string, int index)
/* code length */
len = 11;
}
/* Action Replay code */
else if (string[6] == ':')
{
if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
{
/* 16-bit code (AAAAAA:DDDD) */
if (strlen(string) < 11) return 0;
/* decode 24-bit address */
for (i=0; i<6; i++)
{
p = strchr (arvalidchars, *string++);
if (p == NULL) return 0;
n = (p - arvalidchars) & 0xF;
address |= (n << ((5 - i) * 4));
}
/* decode 16-bit data */
string++;
//Action Replay
else if ((strlen(string) >=9) && (string[4] == '-')){
string+=2;
/* decode 16-bit address */
for (i=0; i<4; i++)
{
p = strchr (arvalidchars, *string++);
if (p == NULL) return 0;
n = (p - arvalidchars) & 0xF;
data |= (n << ((3 - i) * 4));
address |= (n << ((3 - i) * 4));
if (i==1) string++;
}
/* decode 8-bit data */
for (i=0; i<2; i++)
{
p = strchr (arvalidchars, *string++);
if (p == NULL) return 0;
n = (p - arvalidchars) & 0xF;
data |= (n << ((1 - i) * 4));
}
/* code length */
len = 11;
len = 9;
}
else
//Fusion RAM
else if ((strlen(string) >=7) && (string[4] == ':'))
{
/* 8-bit code (xxAAAA:DD) */
if (strlen(string) < 9) return 0;
/* decode 16-bit address */
string+=2;
for (i=0; i<4; i++)
{
p = strchr (arvalidchars, *string++);
@ -1331,10 +1348,6 @@ static uint32_t decode_cheat(char *string, int index)
n = (p - arvalidchars) & 0xF;
address |= (n << ((3 - i) * 4));
}
/* ROM addresses are not supported */
if (address < 0xC000) return 0;
/* convert to 24-bit Work RAM address */
address = 0xFF0000 | (address & 0x1FFF);
/* decode 8-bit data */
string++;
for (i=0; i<2; i++)
@ -1345,6 +1358,40 @@ static uint32_t decode_cheat(char *string, int index)
data |= (n << ((1 - i) * 4));
}
/* code length */
len = 7;
}
//Fusion ROM
else if ((strlen(string) >=9) && (string[6] == ':'))
{
/* decode reference 8-bit data */
for (i=0; i<2; i++)
{
p = strchr (arvalidchars, *string++);
if (p == NULL) return 0;
n = (p - arvalidchars) & 0xF;
ref |= (n << ((1 - i) * 4));
}
/* decode 16-bit address */
for (i=0; i<4; i++)
{
p = strchr (arvalidchars, *string++);
if (p == NULL) return 0;
n = (p - arvalidchars) & 0xF;
address |= (n << ((3 - i) * 4));
}
/* decode 8-bit data */
string++;
for (i=0; i<2; i++)
{
p = strchr (arvalidchars, *string++);
if (p == NULL) return 0;
n = (p - arvalidchars) & 0xF;
data |= (n << ((1 - i) * 4));
}
/* update old data value */
cheatlist[index].old = ref;
/* code length */
len = 9;
}
}
@ -1894,19 +1941,16 @@ void retro_cheat_set(unsigned index, bool enabled, const char *code)
{
char codeCopy[256];
char *buff;
bool multiline=0;
/* Avoid crashing when giving empty input */
if (code=='\0') return;
/* clear existing ROM patches */
clear_cheats();
/* Detect and split multiline cheats */
strcpy(codeCopy,code);
if (strstr(code,"+")){
multiline=1;
buff = strtok(codeCopy,"+");
} else {
buff=codeCopy;
}
while (buff != NULL)
{
@ -1933,8 +1977,6 @@ void retro_cheat_set(unsigned index, bool enabled, const char *code)
maxcheats++;
}
}
if (!multiline)
break;
buff = strtok(NULL,"+");
}