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lzpf: updated function flow path

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zefie
2021-08-08 17:06:07 -04:00
parent 5e8aebd621
commit 02c92b8527
1 changed files with 22 additions and 22 deletions
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44
zefie_wtvp_minisrv/WTVLzpf.js
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@@ -21,7 +21,6 @@ class WTVLzpf {
checksum = 0;
flag_table = new Uint16Array(0x1000)
ring_buffer = new Uint8Array(0x2000)
encoded_data = [];
nomatchEncode = [
[0x0000, 0x10], [0x0001, 0x10], [0x0002, 0x10],
@@ -289,7 +288,6 @@ class WTVLzpf {
this.checksum = 0;
this.ring_buffer.fill(0x00, 0, 0x2000)
this.flag_table.fill(0xFFFF, 0, 0x1000);
this.encoded_data = [];
}
/**
@@ -299,8 +297,9 @@ class WTVLzpf {
*
* @returns {undefined}
*/
AddByte(byte) {
this.encoded_data.push(byte);
AddByte(byte, encoded_data) {
encoded_data.push(byte);
return encoded_data;
}
/**
@@ -311,18 +310,19 @@ class WTVLzpf {
*
* @returns {undefined}
*/
EncodeLiteral(code_length, code) {
EncodeLiteral(code_length, code, encoded_data) {
// Using >>> to stick with unsigned integers without making a mess with casting.
this.current_literal |= code >>> (this.current_length & 0x1F);
this.current_length += code_length;
while (this.current_length > 7) {
this.AddByte((this.current_literal >>> 0x18) & 0xFF);
encoded_data = this.AddByte((this.current_literal >>> 0x18) & 0xFF, encoded_data);
this.current_length -= 8;
this.current_literal = (this.current_literal << 8) & 0xFFFFFFFF;
}
return encoded_data;
}
/**
@@ -342,8 +342,7 @@ class WTVLzpf {
*
* @returns {Buffer} Lzpf encoded data
*/
EncodeBlock(unencoded_data, compress_data) {
this.encoded_data = [];
EncodeBlock(unencoded_data, compress_data, encoded_data = []) {
var uncompressed_len = unencoded_data.byteLength;
var i = 0;
@@ -397,11 +396,11 @@ class WTVLzpf {
}
if (code_length > 0) {
this.EncodeLiteral(code_length, code);
encoded_data = this.EncodeLiteral(code_length, code, encoded_data);
}
}
return Buffer.from(this.encoded_data);
return encoded_data;
}
/**
@@ -411,37 +410,38 @@ class WTVLzpf {
*
* @returns {Buffer} Lzpf compression data
*/
Finish() {
Finish(encoded_data) {
var code_length = -1
var code = -1
if (this.type_index == 2) {
this.EncodeLiteral(0x10, 0x00990000);
encoded_data = this.EncodeLiteral(0x10, 0x00990000, encoded_data);
} else if (this.type_index >= 3) {
if (this.type_index == 4) {
code_length = this.matchEncode[this.match_index][1];
code = this.matchEncode[this.match_index][0];
this.EncodeLiteral(code_length, code);
encoded_data = this.EncodeLiteral(code_length, code, encoded_data);
}
var flags_index = (this.working_data >>> 0x0B ^ this.working_data) & 0x0FFF;
var flag = this.flag_table[flags_index];
if (flag == 0xFFFF) {
this.EncodeLiteral(0x10, 0x00990000);
encoded_data = this.EncodeLiteral(0x10, 0x00990000, encoded_data);
} else {
this.EncodeLiteral(0x11, 0x004c8000);
encoded_data = this.EncodeLiteral(0x11, 0x004c8000, encoded_data);
}
}
// Below is just metadata. The compressed block is complete.
// Encode checksum
this.EncodeLiteral(0x08, (this.checksum << 0x10) & 0xFFFFFFFF);
this.EncodeLiteral(0x08, (this.checksum << 0x18) & 0xFFFFFFFF);
encoded_data = this.EncodeLiteral(0x08, (this.checksum << 0x10) & 0xFFFFFFFF, encoded_data);
encoded_data = this.EncodeLiteral(0x08, (this.checksum << 0x18) & 0xFFFFFFFF, encoded_data);
// End
this.AddByte((this.current_literal >>> 0x18) & 0xFF);
this.AddByte(0x20);
encoded_data = this.AddByte((this.current_literal >>> 0x18) & 0xFF, encoded_data);
encoded_data = this.AddByte(0x20, encoded_data);
return encoded_data;
}
/**
@@ -474,10 +474,10 @@ class WTVLzpf {
Compress(uncompressed_data) {
uncompressed_data = this.ConvertToBuffer(uncompressed_data);
this.Begin();
this.EncodeBlock(uncompressed_data, true);
this.Finish();
var compressed_data = this.EncodeBlock(uncompressed_data, true);
compressed_data = this.Finish(compressed_data);
return Buffer.from(this.encoded_data);
return Buffer.from(compressed_data);
}
}