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pcsx2/plugins/CDVDlinuz/Src/buffer.c

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/* buffer.c
* Copyright (C) 2002-2005 CDVDlinuz Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <errno.h> // errno
#include <stddef.h> // NULL
#include <stdio.h> // printf()
#include <string.h> // strerror()
#define CDVDdefs
#include "PS2Edefs.h"
#include "logfile.h"
#include "buffer.h"
// Globals
struct BufferSortEmpty {
u16 sortptr;
};
struct BufferSort {
u16 upptr;
u16 uppos;
u32 mask;
u32 divisor;
struct {
u8 isdata;
u16 ptr;
} lower[256];
u16 ptrcount;
u16 firstptr;
};
struct BufferSortEmpty buffersortempty[BUFFERMAX];
u16 buffersortemptystart;
u16 buffersortemptyend;
struct BufferSort buffersort[BUFFERMAX];
u8 buffersortstartisdata;
u16 buffersortstart;
struct BufferList bufferlist[BUFFERMAX];
u16 userbuffer;
u16 replacebuffer;
void InitBuffer() {
u16 i;
u16 j;
#ifdef VERBOSE_FUNCTION_BUFFER
PrintLog("CDVD buffer: InitBuffer()");
#endif /* VERBOSE_FUNCTION_BUFFER */
buffersortemptystart = 0;
buffersortemptyend = 0;
for(i = 0; i < BUFFERMAX; i++) {
buffersortempty[i].sortptr = i;
} // NEXT i- Saying all buffersort[] entries are open.
buffersortstart = 0xffff;
buffersortstartisdata = 2;
for(i = 0; i < BUFFERMAX; i++) {
for(j = 0; j < 256; j++) buffersort[i].lower[j].isdata = 2;
// buffersort[i].ptrcount = 0;
} // NEXT i- Saying all buffersort[] entries are open.
for(i = 0; i < BUFFERMAX; i++) {
bufferlist[i].upsort = 0xffff;
} // NEXT i- Clearing out the buffer pointers
userbuffer = 0xffff;
replacebuffer = BUFFERMAX - 1;
} // END InitBuffer();
u16 AllocSortBuffer() {
u16 newbuffer;
#ifdef VERBOSE_FUNCTION_BUFFER
PrintLog("CDVD buffer: AllocSortBuffer()");
#endif /* VERBOSE_FUNCTION_BUFFER */
newbuffer = buffersortempty[buffersortemptyend].sortptr;
buffersortempty[buffersortemptyend].sortptr = BUFFERMAX;
buffersortemptyend++;
if(buffersortemptyend > BUFFERMAX - 1) buffersortemptyend = 0;
#ifdef VERBOSE_FUNCTION_BUFFER
PrintLog("CDVD buffer: Sort Buffer %u", newbuffer);
#endif /* VERBOSE_FUNCTION_BUFFER */
#ifdef VERBOSE_WARNINGS_BUFFER
if(buffersortemptyend == buffersortemptystart) {
PrintLog("Completely out of Sort Buffers to allocate now!");
} // ENDIF- Out of Sort Buffers? Say so!
#endif /* VERBOSE_WARNINGS_BUFFER */
return(newbuffer);
} // END AllocSortBuffer()
void ReleaseSortBuffer(u16 oldbuffer) {
#ifdef VERBOSE_FUNCTION_BUFFER
PrintLog("CDVD buffer: ReleaseSortBuffer(%u)", oldbuffer);
#endif /* VERBOSE_FUNCTION_BUFFER */
buffersortempty[buffersortemptystart].sortptr = oldbuffer;
buffersortemptystart++;
if(buffersortemptystart > BUFFERMAX - 1) buffersortemptystart = 0;
} // END ReleaseSortBuffer()
// Returns either index in buffersort... or closest insertion point.
// Make lsn == buffersort[int].lsn test for exact match
u16 FindListBuffer(u32 lsn) {
u16 current;
u8 isdata;
u32 index;
#ifdef VERBOSE_FUNCTION_BUFFER
PrintLog("CDVD buffer: FindListBuffer(%u)", lsn);
#endif /* VERBOSE_FUNCTION_BUFFER */
if(buffersortstart == 0xffff) return(0xffff); // Buffer empty? Exit
if(buffersortstartisdata == 1) {
if(bufferlist[buffersortstart].lsn != lsn) return(0xffff);
return(buffersortstart);
} // ENDIF- Only one Record in Buffer?
#ifdef VERBOSE_FUNCTION_BUFFER
PrintLog("CDVD buffer: Searching...");
#endif /* VERBOSE_FUNCTION_BUFFER */
current = buffersortstart;
isdata = 0;
while(isdata == 0) {
index = lsn;
index &= buffersort[current].mask;
index /= buffersort[current].divisor;
isdata = buffersort[current].lower[index].isdata;
current = buffersort[current].lower[index].ptr;
} // ENDWHILE- still haven't found data
if(isdata == 2) return(0xffff); // Pointing at empty entry?
if(bufferlist[current].lsn != lsn) return(0xffff); // LSNs don't match?
#ifdef VERBOSE_FUNCTION_BUFFER
PrintLog("CDVD buffer: Found.");
#endif /* VERBOSE_FUNCTION_BUFFER */
return(current);
} // END FindListBuffer()
// Removes buffer from the buffersort list
// bufnum = The bufferlist pointer
void RemoveListBuffer(u16 bufnum) {
u16 current;
u16 currentpos;
u16 upperlink;
u16 upperindex;
u16 lowerlink;
u8 lowerisdata;
u32 index;
#ifdef VERBOSE_FUNCTION_BUFFER
PrintLog("CDVD buffer: RemoveListBuffer(%u)", bufnum);
#endif /* VERBOSE_FUNCTION_BUFFER */
if(bufferlist[bufnum].upsort == 0xffff) return; // No link to break.
current = bufferlist[bufnum].upsort;
currentpos = bufferlist[bufnum].uppos;
bufferlist[bufnum].upsort = 0xffff;
if(current == 0xfffe) {
buffersortstart = 0xffff;
buffersortstartisdata = 2;
#ifdef VERBOSE_FUNCTION_BUFFER
PrintLog("CDVD buffer: Buffer emptied");
#endif /* VERBOSE_FUNCTION_BUFFER */
return;
} // ENDIF- Last link broken... empty buffer now.
lowerlink = 0xffff;
lowerisdata = 2;
// Remove Lower Pointer
buffersort[current].lower[currentpos].isdata = 2;
if(currentpos == buffersort[current].firstptr) {
index = currentpos + 1;
while((index < 256) && (buffersort[current].lower[index].isdata == 2)) index++;
buffersort[current].firstptr = index;
} // ENDIF- Do we need to move firstptr to an active entry?
buffersort[current].ptrcount--;
#ifdef VERBOSE_FUNCTION_BUFFER
PrintLog("CDVD buffer: Pointer count for sort buffer %u: %u",
current, buffersort[current].ptrcount);
#endif /* VERBOSE_FUNCTION_BUFFER */
if(buffersort[current].ptrcount > 1) return; // Still 2+ branches left
// Find Lower Link
index = buffersort[current].firstptr;
lowerlink = buffersort[current].lower[index].ptr;
lowerisdata = buffersort[current].lower[index].isdata;
buffersort[current].lower[index].isdata = 2;
// Find and Break Upper Link
upperlink = buffersort[current].upptr;
upperindex = buffersort[current].uppos;
if(upperlink == 0xffff) {
buffersortstart = lowerlink;
buffersortstartisdata = lowerisdata;
} else {
buffersort[upperlink].lower[upperindex].ptr = lowerlink;
buffersort[upperlink].lower[upperindex].isdata = lowerisdata;
} // ENDIF- Did we hit the top of the web?
// Break Lower Link
if(lowerisdata == 1) {
if(upperlink == 0xffff) {
bufferlist[lowerlink].upsort = 0xfffe;
#ifdef VERBOSE_FUNCTION_BUFFER
PrintLog("CDVD buffer: Buffer down to 1 record now");
#endif /* VERBOSE_FUNCTION_BUFFER */
} else {
bufferlist[lowerlink].upsort = upperlink;
bufferlist[lowerlink].uppos = upperindex;
} // ENDIF- Is this the last active buffersort?
} else {
buffersort[lowerlink].upptr = upperlink;
buffersort[lowerlink].uppos = upperindex;
} // ENDIF- Was this a BufferList link?
// Cleanup in aisle 5....
ReleaseSortBuffer(current);
return;
} // END RemoveListBuffer()
// Adds buffer to the buffersort list
// bufnum = The bufferlist pointer
void AddListBuffer(u16 bufnum) {
u32 newmask;
u32 newdivisor;
u16 newbuffer;
u32 newvalue;
u16 current;
u32 currentvalue;
u8 currentisdata;
u16 prevbuffer;
u32 prevvalue;
u16 comparebuffer;
u8 compareisdata;
u32 comparevalue;
#ifdef VERBOSE_FUNCTION_BUFFER
PrintLog("CDVD buffer: AddListBuffer(%u)", bufnum);
#endif /* VERBOSE_FUNCTION_BUFFER */
// Already in list? Oh, re-sorting? Got it covered.
if(bufferlist[bufnum].upsort != 0xffff) RemoveListBuffer(bufnum);
if(buffersortstartisdata == 2) {
buffersortstart = bufnum;
buffersortstartisdata = 1;
bufferlist[bufnum].upsort = 0xfffe;
#ifdef VERBOSE_FUNCTION_BUFFER
PrintLog("CDVD buffer: Buffer up to 1 record now");
#endif /* VERBOSE_FUNCTION_BUFFER */
return;
} // ENDIF- Empty list? Set for just 1 entry.
if(buffersortstartisdata == 1) {
newmask = 0xff000000;
newdivisor = 0x01000000;
newvalue = (bufferlist[bufnum].lsn & newmask) / newdivisor;
currentvalue = (bufferlist[buffersortstart].lsn & newmask) / newdivisor;
while((newdivisor != 0x00000001) && (newvalue == currentvalue)) {
newmask /= 0x0100;
newdivisor /= 0x0100;
newvalue = (bufferlist[bufnum].lsn & newmask) / newdivisor;
currentvalue = (bufferlist[buffersortstart].lsn & newmask) / newdivisor;
} // ENDWHILE- trying to find a difference between the LSNs
if(newvalue == currentvalue) {
bufferlist[buffersortstart].upsort = 0xffff;
bufferlist[bufnum].upsort = 0xfffe;
buffersortstart = bufnum;
return;
} else {
newbuffer = AllocSortBuffer();
buffersort[newbuffer].upptr = 0xffff;
buffersort[newbuffer].mask = newmask;
buffersort[newbuffer].divisor = newdivisor;
buffersort[newbuffer].lower[currentvalue].isdata = 1;
buffersort[newbuffer].lower[currentvalue].ptr = buffersortstart;
buffersort[newbuffer].lower[newvalue].isdata = 1;
buffersort[newbuffer].lower[newvalue].ptr = bufnum;
buffersort[newbuffer].ptrcount = 2;
buffersort[newbuffer].firstptr = currentvalue;
if(newvalue < buffersort[newbuffer].firstptr)
buffersort[newbuffer].firstptr = newvalue;
bufferlist[buffersortstart].upsort = newbuffer;
bufferlist[buffersortstart].uppos = currentvalue;
buffersortstart = newbuffer;
buffersortstartisdata = 0;
bufferlist[bufnum].upsort = newbuffer;
bufferlist[bufnum].uppos = newvalue;
#ifdef VERBOSE_FUNCTION_BUFFER
PrintLog("CDVD buffer: Buffer up to 2 records now");
#endif /* VERBOSE_FUNCTION_BUFFER */
return;
} // ENDIF- Same LSN? Shift pointer in response. Else, add a Sort Record.
} // ENDIF- Only 1 record? Check if we need a Sort Record.
newmask = 0xff000000;
newdivisor = 0x01000000;
prevbuffer = 0xffff;
prevvalue = 0;
current = buffersortstart;
currentisdata = 0;
while(currentisdata == 0) {
newvalue = (bufferlist[bufnum].lsn & newmask) / newdivisor;
if(buffersort[current].mask != newmask) {
comparebuffer = current;
compareisdata = 0;
while(compareisdata == 0) {
comparevalue = buffersort[comparebuffer].firstptr;
compareisdata = buffersort[comparebuffer].lower[comparevalue].isdata;
comparebuffer = buffersort[comparebuffer].lower[comparevalue].ptr;
} // ENDWHILE- looking for an another buffer to compare to...
comparevalue = (bufferlist[comparebuffer].lsn & newmask) / newdivisor;
if(newvalue != comparevalue) {
// Add buffersort here (comparevalue/newvalue)
newbuffer = AllocSortBuffer();
buffersort[newbuffer].upptr = buffersort[current].upptr;
buffersort[newbuffer].uppos = buffersort[current].uppos;
buffersort[newbuffer].mask = newmask;
buffersort[newbuffer].divisor = newdivisor;
buffersort[newbuffer].lower[comparevalue].isdata = 0;
buffersort[newbuffer].lower[comparevalue].ptr = current;
buffersort[newbuffer].lower[newvalue].isdata = 1;
buffersort[newbuffer].lower[newvalue].ptr = bufnum;
buffersort[newbuffer].ptrcount = 2;
buffersort[newbuffer].firstptr = comparevalue;
if(newvalue < buffersort[newbuffer].firstptr)
buffersort[newbuffer].firstptr = newvalue;
if(buffersort[newbuffer].upptr == 0xffff) {
buffersortstart = newbuffer;
} else {
buffersort[prevbuffer].lower[prevvalue].isdata = 0;
buffersort[prevbuffer].lower[prevvalue].ptr = newbuffer;
if(prevvalue < buffersort[prevbuffer].firstptr)
buffersort[prevbuffer].firstptr = prevvalue;
} // ENDIF- Do we need to adjust to buffersortstart connection?
buffersort[current].upptr = newbuffer;
buffersort[current].uppos = comparevalue;
bufferlist[bufnum].upsort = newbuffer;
bufferlist[bufnum].uppos = newvalue;
return;
} // ENDIF- Don't match? Add a buffersort here to say that!
compareisdata = 0;
newmask /= 0x0100;
newdivisor /= 0x0100;
} else {
currentisdata = buffersort[current].lower[newvalue].isdata;
prevbuffer = current;
prevvalue = newvalue;
if(currentisdata == 0) {
current = buffersort[current].lower[newvalue].ptr;
newmask /= 0x0100;
newdivisor /= 0x0100;
if(newdivisor == 0) {
#ifdef VERBOSE_WARNINGS_BUFFER
PrintLog("CDVD buffer: Mask/Divisor at 0! Index corruption! (detected in search)");
#endif /* VERBOSE_WARNINGS_BUFFER */
return;
} // ENDIF- The Mask went too far! Abort! (Sanity Check)
} // ENDIF- Do we have to go through another level of sort data?
} // ENDIF- We don't have a comparison on this byte?
} // ENDWHILE- looking for his level...
if(buffersort[current].lower[newvalue].isdata == 2) {
buffersort[current].lower[newvalue].isdata = 1;
buffersort[current].lower[newvalue].ptr = bufnum;
buffersort[current].ptrcount++;
if(newvalue < buffersort[current].firstptr)
buffersort[current].firstptr = newvalue;
bufferlist[bufnum].upsort = current;
bufferlist[bufnum].uppos = newvalue;
return;
} // ENDIF- an empty slot? Fill it in.
comparebuffer = buffersort[current].lower[newvalue].ptr;
if(bufferlist[bufnum].lsn == bufferlist[comparebuffer].lsn) {
buffersort[current].lower[newvalue].ptr = bufnum;
bufferlist[bufnum].upsort = current;
bufferlist[bufnum].uppos = newvalue;
bufferlist[comparebuffer].upsort = 0xffff;
return;
} // ENDIF- Same LSN? Replace!
// Calc new position based on new separation markers...
newmask /= 0x0100;
newdivisor /= 0x0100;
if(newdivisor == 0) {
#ifdef VERBOSE_WARNINGS_BUFFER
PrintLog("CDVD buffer: Mask/Divisor at 0! Index corruption! (bottom add initial)");
#endif /* VERBOSE_WARNINGS_BUFFER */
return;
} // ENDIF- The Mask went too far! Abort! (Sanity Check)
newvalue = (bufferlist[bufnum].lsn & newmask) / newdivisor;
comparevalue = (bufferlist[comparebuffer].lsn & newmask) / newdivisor;
while((newmask != 0x000000ff) && (comparevalue == newvalue)) {
newmask /= 0x0100;
newdivisor /= 0x0100;
if(newdivisor == 0) {
#ifdef VERBOSE_WARNINGS_BUFFER
PrintLog("CDVD buffer: Mask/Divisor at 0! Index corruption! (bottom add loop)");
#endif /* VERBOSE_WARNINGS_BUFFER */
return;
} // ENDIF- The Mask went too far! Abort! (Sanity Check)
newvalue = (bufferlist[bufnum].lsn & newmask) / newdivisor;
comparevalue = (bufferlist[comparebuffer].lsn & newmask) / newdivisor;
} // ENDWHILE- continuing to scan for difference between the two numbers
newbuffer = AllocSortBuffer();
buffersort[newbuffer].upptr = prevbuffer;
buffersort[newbuffer].uppos = prevvalue;
buffersort[newbuffer].mask = newmask;
buffersort[newbuffer].divisor = newdivisor;
buffersort[newbuffer].lower[comparevalue].isdata = 1;
buffersort[newbuffer].lower[comparevalue].ptr = comparebuffer;
buffersort[newbuffer].lower[newvalue].isdata = 1;
buffersort[newbuffer].lower[newvalue].ptr = bufnum;
buffersort[newbuffer].ptrcount = 2;
buffersort[newbuffer].firstptr = comparevalue;
if(newvalue < buffersort[newbuffer].firstptr)
buffersort[newbuffer].firstptr = newvalue;
buffersort[prevbuffer].lower[prevvalue].isdata = 0;
buffersort[prevbuffer].lower[prevvalue].ptr = newbuffer;
bufferlist[comparebuffer].upsort = newbuffer;
bufferlist[comparebuffer].uppos = comparevalue;
bufferlist[bufnum].upsort = newbuffer;
bufferlist[bufnum].uppos = newvalue;
} // END AddListBuffer()
#ifdef VERBOSE_WARNINGS_BUFFER
void PrintSortBuffers() {
u16 h;
u16 i;
u16 j;
printf("CDVD buffer: Sort Buffer Dump\n");
printf("CDVD buffer: Top Pointer: isdata %u ptr %u\n",
buffersortstartisdata, buffersortstart);
for(i = 0; i < BUFFERMAX; i++) {
h = 0;
while((h < BUFFERMAX) && (buffersortempty[h].sortptr != i)) h++;
if(h == BUFFERMAX) {
printf("CDVD buffer: Sort Buffer:%u Mask:%x Divisor:%x\n",
i, buffersort[i].mask, buffersort[i].divisor);
printf("CDVD buffer: Up Ptr:%u Up Pos:%u First Down Ptr:%u Ptr Count: %u\n",
buffersort[i].upptr,
buffersort[i].uppos,
buffersort[i].firstptr,
buffersort[i].ptrcount);
printf("CDVD buffer: ");
for(j = 0; j < 256; j++) {
if(buffersort[i].lower[j].isdata == 1) printf(" D");
if(buffersort[i].lower[j].isdata == 0) printf(" L");
if(buffersort[i].lower[j].isdata < 2) {
printf("%u:%u", j, buffersort[i].lower[j].ptr);
} // ENDIF- We have active data? Print it.
} // NEXT j- Scanning lower 256 pointers for active ones...
printf("\n");
} // ENDIF- Not found in inactive list? Must be active! Print it.
} // NEXT i- looking at all the Allocated Buffers...
} // END PrintSortBuffers()
#endif /* VERBOSE_WARNINGS_BUFFER */
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