mirror of https://github.com/OpenRCT2/OpenRCT2.git
Added encode functions. Missing check sum calc for end of chunk
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@ -28,6 +28,8 @@ static int decode_chunk_rle(uint8* src_buffer, uint8* dst_buffer, int length);
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static int decode_chunk_repeat(char *buffer, int length);
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static void decode_chunk_rotate(char *buffer, int length);
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int encode_chunk_rle(char *src_buffer, char *dst_buffer, int length);
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void encode_chunk_rotate(char *buffer, int length);
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/**
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*
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* rct2: 0x00676FD2
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@ -195,6 +197,7 @@ static void decode_chunk_rotate(char *buffer, int length)
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*
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*/
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int sawyercoding_write_chunk(FILE *file, uint8* buffer, sawyercoding_chunk_header chunkHeader){
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uint8* dst_buffer;
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switch (chunkHeader.encoding){
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case CHUNK_ENCODING_NONE:
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@ -202,15 +205,80 @@ int sawyercoding_write_chunk(FILE *file, uint8* buffer, sawyercoding_chunk_heade
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fwrite(buffer, 1, chunkHeader.length, file);
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break;
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case CHUNK_ENCODING_RLE:
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//chunkHeader.length = decode_chunk_rle(src_buffer, buffer, chunkHeader.length);
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dst_buffer = malloc(0x600000);
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chunkHeader.length = encode_chunk_rle(buffer, dst_buffer, chunkHeader.length);
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fwrite(&chunkHeader, sizeof(sawyercoding_chunk_header), 1, file);
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fwrite(dst_buffer, 1, chunkHeader.length, file);
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free(dst_buffer);
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break;
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case CHUNK_ENCODING_RLECOMPRESSED:
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//chunkHeader.length = decode_chunk_rle(src_buffer, buffer, chunkHeader.length);
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//chunkHeader.length = decode_chunk_repeat(buffer, chunkHeader.length);
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break;
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case CHUNK_ENCODING_ROTATE:
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//memcpy(buffer, src_buffer, chunkHeader.length);
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//decode_chunk_rotate(buffer, chunkHeader.length);
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encode_chunk_rotate(buffer, chunkHeader.length);
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fwrite(&chunkHeader, sizeof(sawyercoding_chunk_header), 1, file);
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fwrite(buffer, 1, chunkHeader.length, file);
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break;
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}
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return chunkHeader.length;
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}
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/**
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* Ensure dst_buffer is bigger than src_buffer then resize afterwards
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* returns length of dst_buffer
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*/
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int encode_chunk_rle(char *src_buffer, char *dst_buffer, int length)
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{
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char* src = src_buffer;
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char* dst = dst_buffer;
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char* end_src = src + length;
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uint8 count = 0;
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char* src_norm_start = src;
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while (src < end_src - 1){
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if ((count && *src == src[1]) || count > 126){
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*dst++ = count;
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for (; count != 0; --count){
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*dst++ = *src_norm_start++;
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}
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}
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if (*src == src[1]){
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for (; (count < 127) && ((src + count) < end_src); count++){
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if (*src != src[count]) break;
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}
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*dst++ = 257 - count;
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*dst++ = *src;
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src += count;
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src_norm_start = src;
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count = 0;
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}
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else{
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count++;
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src++;
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}
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}
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if (src == end_src - 1)count++;
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if (count){
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*dst++ = count;
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for (; count != 0; --count){
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*dst++ = *src_norm_start++;
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}
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}
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return dst - dst_buffer;
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}
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/**
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*
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*
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*/
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void encode_chunk_rotate(char *buffer, int length)
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{
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int i, code = 1;
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for (i = 0; i < length; i++) {
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buffer[i] = rol8(buffer[i], code);
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code = (code + 2) % 8;
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}
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}
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