diff options
Diffstat (limited to 'lib/rbcodec/codecs/cRSID/host/file.c')
-rw-r--r-- | lib/rbcodec/codecs/cRSID/host/file.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/cRSID/host/file.c b/lib/rbcodec/codecs/cRSID/host/file.c new file mode 100644 index 0000000000..c87f37ebb4 --- /dev/null +++ b/lib/rbcodec/codecs/cRSID/host/file.c | |||
@@ -0,0 +1,60 @@ | |||
1 | |||
2 | |||
3 | #ifdef CRSID_PLATFORM_PC | ||
4 | |||
5 | int cRSID_loadSIDfile (unsigned char* SIDfileData, char* filename, int maxlen) { | ||
6 | static signed short Data; | ||
7 | static signed int SizeCnt; | ||
8 | static FILE *SIDfile; | ||
9 | |||
10 | if ( (SIDfile=fopen(filename,"rb")) == NULL ) return CRSID_ERROR_LOAD; | ||
11 | |||
12 | SizeCnt=0; | ||
13 | |||
14 | while ( (Data=fgetc(SIDfile)) != EOF ) { | ||
15 | if (SizeCnt >= maxlen) return CRSID_ERROR_LOAD; | ||
16 | SIDfileData[SizeCnt] = Data; SizeCnt++; | ||
17 | } | ||
18 | |||
19 | fclose(SIDfile); | ||
20 | return SizeCnt; | ||
21 | } | ||
22 | |||
23 | #endif | ||
24 | |||
25 | |||
26 | cRSID_SIDheader* cRSID_processSIDfile(cRSID_C64instance* C64, unsigned char* filedata, int filesize) { | ||
27 | int i; | ||
28 | unsigned short SIDdataOffset; | ||
29 | cRSID_SIDheader* SIDheader; | ||
30 | static const char MagicStringPSID[]="PSID"; | ||
31 | //static const char MagicStringRSID[]="RSID"; | ||
32 | |||
33 | C64->SIDheader = SIDheader = (cRSID_SIDheader*) filedata; | ||
34 | |||
35 | for (i=0x0000; i < 0xA000; ++i) C64->RAMbank[i]=0; //fresh start (maybe some bugged SIDs want 0 at certain RAM-locations) | ||
36 | for (i=0xC000; i < 0xD000; ++i) C64->RAMbank[i]=0; | ||
37 | |||
38 | if ( SIDheader->MagicString[0] != 'P' && SIDheader->MagicString[0] != 'R' ) return NULL; | ||
39 | for (i=1; i < (int)(sizeof(MagicStringPSID)-1); ++i) { if (SIDheader->MagicString[i] != MagicStringPSID[i]) return NULL; } | ||
40 | C64->RealSIDmode = ( SIDheader->MagicString[0] == 'R' ); | ||
41 | |||
42 | if (SIDheader->LoadAddressH==0 && SIDheader->LoadAddressH==0) { //load-address taken from first 2 bytes of the C64 PRG | ||
43 | C64->LoadAddress = (filedata[SIDheader->HeaderSize+1]<<8) + (filedata[SIDheader->HeaderSize+0]); | ||
44 | SIDdataOffset = SIDheader->HeaderSize+2; | ||
45 | } | ||
46 | else { //load-adress taken from SID-header | ||
47 | C64->LoadAddress = (SIDheader->LoadAddressH<<8) + (SIDheader->LoadAddressL); | ||
48 | SIDdataOffset = SIDheader->HeaderSize; | ||
49 | } | ||
50 | |||
51 | for (i=SIDdataOffset; i<filesize; ++i) C64->RAMbank [ C64->LoadAddress + (i-SIDdataOffset) ] = filedata[i]; | ||
52 | |||
53 | i = C64->LoadAddress + (filesize-SIDdataOffset); | ||
54 | C64->EndAddress = (i<0x10000) ? i : 0xFFFF; | ||
55 | |||
56 | C64->PSIDdigiMode = ( !C64->RealSIDmode && (SIDheader->ModelFormatStandard & 2) ); | ||
57 | |||
58 | return C64->SIDheader; | ||
59 | } | ||
60 | |||