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more riff compress algo

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wrapper 2025-12-31 20:14:02 +07:00
parent 3040c15f07
commit c762dc9e25
1 changed files with 13 additions and 34 deletions
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47
dcc/dn_dcc_proto.c
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@ -86,34 +86,25 @@ uint32_t DN_Calculate_CRC32(uint32_t crc, uint8_t* data, uint32_t len)
}
/* 02 - Compress */
void DN_RLE_FindMatch(uint8_t *src,uint32_t *RAW_Count,uint32_t *RLE_Count,uint32_t size)
void DN_RLE_FindMatch(uint8_t *src, uint32_t *RAW_Count, uint32_t *RLE_Count, uint32_t size)
{
uint8_t first;
uint8_t second;
uint32_t pReadOffset = 0;
uint32_t rawCount = 0;
uint32_t runCount = 1;
uint32_t pReadSize = 0x7fff;
if (size < 0x7fff) {
pReadSize = size;
}
uint32_t pReadSize = size < 0x7fff ? size : 0x7fff;
uint32_t rawCount = 0;
while (pReadOffset < (pReadSize - 1)) {
wdog_reset();
first = src[pReadOffset];
second = src[pReadOffset + 1];
pReadOffset++;
if (first == second) {
if (src[pReadOffset] == src[pReadOffset + 1]) {
runCount++;
}
else {
if (4 < runCount) break;
rawCount = pReadOffset + 1;
runCount = 1;
rawCount = pReadOffset;
}
pReadOffset++;
}
*RAW_Count = rawCount;
@ -133,26 +124,19 @@ uint32_t DN_Packet_Compress(uint8_t *src, uint32_t size, uint8_t *dest)
wdog_reset();
DN_RLE_FindMatch(src + inOffset,&RAW_PixCount,&RLE_PixCount,size - inOffset);
if (RAW_PixCount != 0) {
// memcpy(dest + outOffset, &RAW_PixCount, 2);
dest[outOffset] = RAW_PixCount & 0xff;
dest[outOffset + 1] = RAW_PixCount >> 8;
memcpy(dest + outOffset + 2,src + inOffset,RAW_PixCount);
memcpy(dest + outOffset + 2, src + inOffset, RAW_PixCount);
outOffset += RAW_PixCount + 2;
inOffset += RAW_PixCount;
}
if (RLE_PixCount != 0) {
RLE_PixCount |= 0x8000;
// memcpy(dest + outOffset, &RLE_PixCount, 2);
dest[outOffset] = RLE_PixCount & 0xff;
dest[outOffset + 1] = RLE_PixCount >> 8;
dest[outOffset + 1] = (RLE_PixCount | 0x8000) >> 8;
dest[outOffset + 2] = src[inOffset];
outOffset += 3;
inOffset += RLE_PixCount & 0x7fff;
outOffset += 3;
RLE_PixCount |= 0x8000;
}
}
@ -499,21 +483,16 @@ void DN_Packet_WriteDirectCompressed(uint8_t *src, uint32_t size) {
wdog_reset();
DN_RLE_FindMatch(src + inOffset,&RAW_PixCount,&RLE_PixCount,size - inOffset);
if (RAW_PixCount != 0) {
// memcpy(dest + outOffset, &RAW_PixCount, 2);
DN_Packet_DCC_Send_Buffer16(RAW_PixCount);
DN_Packet_DCC_Send_Buffer8_Multi(src + inOffset, RAW_PixCount);
inOffset += RAW_PixCount;
}
if (RLE_PixCount != 0) {
RLE_PixCount |= 0x8000;
// memcpy(dest + outOffset, &RLE_PixCount, 2);
DN_Packet_DCC_Send_Buffer16(RLE_PixCount);
DN_Packet_DCC_Send_Buffer16(RLE_PixCount | 0x8000);
DN_Packet_DCC_Send_Buffer8(src[inOffset]);
inOffset += RLE_PixCount & 0x7fff;
RLE_PixCount |= 0x8000;
}
}