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mra: support xor mode in patches.

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This commit is contained in:
sorgelig
2020-11-16 19:22:27 +08:00
parent 387c82293a
commit 933b7f57d0
1 changed files with 21 additions and 4 deletions
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25
support/arcade/mra_loader.cpp
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@@ -31,6 +31,7 @@ struct arc_struct {
int repeat;
int insiderom;
int patchaddr;
int dataop;
int validrom0;
int insidesw;
int insideinterleave;
@@ -222,10 +223,18 @@ static int rom_file(const char *name, uint32_t crc32, int start, int len, int ma
return 1;
}
static int rom_patch(const uint8_t *buf, int offset, uint16_t len)
static int rom_patch(const uint8_t *buf, int offset, uint16_t len, int dataop)
{
if ((offset + len) > romlen[0]) return 0;
memcpy(romdata + offset, buf, len);
if (!dataop)
{
memcpy(romdata + offset, buf, len);
}
else
{
for (int i = 0; i < len; i++) romdata[offset + i] ^= buf[i];
}
return 1;
}
@@ -426,7 +435,11 @@ static int xml_send_rom(XMLEvent evt, const XMLNode* node, SXML_CHAR* text, cons
arc_info->imap = 0;
}
if (!strcasecmp(node->tag, "patch")) arc_info->patchaddr = 0;
if (!strcasecmp(node->tag, "patch"))
{
arc_info->patchaddr = 0;
arc_info->dataop = 0;
}
//printf("XML_EVENT_START_NODE: tag [%s]\n",node->tag);
// walk the attributes and save them in the data structure as appropriate
@@ -504,6 +517,10 @@ static int xml_send_rom(XMLEvent evt, const XMLNode* node, SXML_CHAR* text, cons
{
arc_info->patchaddr = strtoul(node->attributes[i].value, NULL, 0);
}
if (!strcasecmp(node->attributes[i].name, "operation") && !strcasecmp(node->tag, "patch"))
{
if(!strcasecmp(node->attributes[i].value, "xor")) arc_info->dataop = 1;
}
if (!strcasecmp(node->attributes[i].name, "map") && !strcasecmp(node->tag, "part"))
{
arc_info->imap = strtoul(node->attributes[i].value, NULL, 16);
@@ -806,7 +823,7 @@ static int xml_send_rom(XMLEvent evt, const XMLNode* node, SXML_CHAR* text, cons
unsigned char* binary = hexstr_to_char(arc_info->data->content, &len);
if (binary)
{
rom_patch(binary, arc_info->patchaddr, len);
rom_patch(binary, arc_info->patchaddr, len, arc_info->dataop);
free(binary);
}
}