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This commit is contained in:
Eric MacDonald
2021-09-08 22:31:59 -04:00
parent 848ff5df74
commit 6b1712e107
1 changed files with 9 additions and 9 deletions
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18
zefie_wtvp_minisrv/WTVLzpf.js
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@@ -25,7 +25,7 @@ class WTVLzpf {
ring_bufer_index = 0xFFFF;
working_data = 0;
match_index = 0;
type_index = 0;
compression_mode = 0;
checksum = 0;
this.filler_byte = 0x20
hash_table = new Uint16Array(0x1000)
@@ -322,7 +322,7 @@ class WTVLzpf {
this.ring_bufer_index = 0xFFFF;
this.working_data = 0;
this.match_index = 0;
this.type_index = 0;
this.compression_mode = 0;
this.checksum = 0;
this.ring_buffer.fill(this.filler_byte, 0, 0x2000)
this.hash_table.fill(0xFFFF, 0, 0x1000);
@@ -399,7 +399,7 @@ class WTVLzpf {
code_length = this.matchEncode[this.match_index][1];
code = this.matchEncode[this.match_index][0];
this.match_index = 0;
this.type_index = 3;
this.compression_mode = 3;
} else {
// Previous iteration found a match so we continue matching until we can't.
this.match_index = (this.match_index + 1) & 0x1FFF;
@@ -418,7 +418,7 @@ class WTVLzpf {
this.hash_table[hash_index] = i & 0x1FFF;
} else {
// The first three uncompressed bytes aren't used for the matching algorithm.
this.type_index++;
this.compression_mode++;
}
if (this.ring_bufer_index == 0xFFFF) {
@@ -429,7 +429,7 @@ class WTVLzpf {
// Wow dude, a match has been found. Let's switch get our own room in the next iteration to see if we match further.
this.match_index = 1;
this.ring_bufer_index = (this.ring_bufer_index + 1) & 0x1FFF;
this.type_index = 4;
this.compression_mode = 4;
} else {
// We've seen these bytes before but the index in the ring buffer doesn't match so we revert to our neat Huffman dictionary
// We add 1 flag bit of 0 to account for the fact we've had a hash table hit but no hit in the ring buffer.
@@ -452,7 +452,7 @@ class WTVLzpf {
/**
* Ends a compression stream.
*
* @param type_index {Number} the end type used to finalize
* @param compression_mode {Number} the end type used to finalize
*
* @returns {Buffer} Lzpf compression data
*/
@@ -460,10 +460,10 @@ class WTVLzpf {
var code_length = -1;
var code = -1;
if (this.type_index == 2) {
if (this.compression_mode == 2) {
this.AddBits(0x00990000, 0x10);
} else if (this.type_index >= 3) {
if (this.type_index == 4) {
} else if (this.compression_mode >= 3) {
if (this.compression_mode == 4) {
code_length = this.matchEncode[this.match_index][1];
code = this.matchEncode[this.match_index][0];
this.AddBits(code, code_length);