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(WEBP): fixed alpha decoder.

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This commit is contained in:
morkt 2016-11-13 15:48:09 +04:00
parent b9480255af
commit 1797f5151f
2 changed files with 11 additions and 13 deletions
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6
ArcFormats/WebP/ImageWEBP.cs
View File

@ -64,11 +64,9 @@ namespace GameRes.Formats.Google
{ {
if (0x46464952 != stream.Signature) // 'RIFF' if (0x46464952 != stream.Signature) // 'RIFF'
return null; return null;
if (!stream.ReadHeader (12).AsciiEqual (8, "WEBP"))
return null;
var header = new byte[0x10]; var header = new byte[0x10];
if (8 != stream.Read (header, 0, 8))
return null;
if (!Binary.AsciiEqual (header, 4, "WEBP"))
return null;
bool found_vp8x = false; bool found_vp8x = false;
var info = new WebPMetaData(); var info = new WebPMetaData();
int chunk_size; int chunk_size;

18
ArcFormats/WebP/Lossless.cs
View File

@ -1614,7 +1614,7 @@ namespace GameRes.Formats.Google
{ {
ulong val_; // pre-fetched bits ulong val_; // pre-fetched bits
byte[] buf_; // input byte buffer byte[] buf_; // input byte buffer
uint len_; // buffer length uint end_pos_; // buffer length
uint pos_; // byte position in buf_ uint pos_; // byte position in buf_
int bit_pos_; // current bit-reading position in val_ int bit_pos_; // current bit-reading position in val_
bool eos_; // true if a bit was read past the end of buffer bool eos_; // true if a bit was read past the end of buffer
@ -1632,11 +1632,11 @@ namespace GameRes.Formats.Google
/// Returns true if there was an attempt at reading bit past the end of /// Returns true if there was an attempt at reading bit past the end of
/// the buffer. Doesn't set br->eos_ flag. /// the buffer. Doesn't set br->eos_ flag.
/// </summary> /// </summary>
private bool IsEndOfStream { get { return eos_ || ((pos_ == len_) && (bit_pos_ > LBITS)); } } private bool IsEndOfStream { get { return eos_ || ((pos_ == end_pos_) && (bit_pos_ > LBITS)); } }
public void Init (byte[] input, int start, uint length) public void Init (byte[] input, int start, uint length)
{ {
len_ = length; end_pos_ = (uint)start + length;
val_ = 0; val_ = 0;
bit_pos_ = 0; bit_pos_ = 0;
eos_ = false; eos_ = false;
@ -1665,7 +1665,7 @@ namespace GameRes.Formats.Google
{ {
other.val_ = val_; other.val_ = val_;
other.buf_ = buf_; other.buf_ = buf_;
other.len_ = len_; other.end_pos_ = end_pos_;
other.pos_ = pos_; other.pos_ = pos_;
other.bit_pos_ = bit_pos_; other.bit_pos_ = bit_pos_;
other.eos_ = eos_; other.eos_ = eos_;
@ -1677,9 +1677,9 @@ namespace GameRes.Formats.Google
public void SetBuffer (byte[] buffer, uint length) public void SetBuffer (byte[] buffer, uint length)
{ {
buf_ = buffer; buf_ = buffer;
len_ = length; end_pos_ = length;
// pos_ > len_ should be considered a param error. // pos_ > end_pos_ should be considered a param error.
eos_ = (pos_ > len_) || IsEndOfStream; eos_ = (pos_ > end_pos_) || IsEndOfStream;
} }
/// <summary> /// <summary>
@ -1742,7 +1742,7 @@ namespace GameRes.Formats.Google
void DoFillBitWindow () void DoFillBitWindow ()
{ {
if (pos_ + sizeof(ulong) < len_) if (pos_ + sizeof(ulong) < end_pos_)
{ {
val_ >>= WBITS; val_ >>= WBITS;
bit_pos_ -= WBITS; bit_pos_ -= WBITS;
@ -1755,7 +1755,7 @@ namespace GameRes.Formats.Google
void ShiftBytes () void ShiftBytes ()
{ {
while (bit_pos_ >= 8 && pos_ < len_) while (bit_pos_ >= 8 && pos_ < end_pos_)
{ {
val_ >>= 8; val_ >>= 8;
val_ |= ((ulong)buf_[pos_]) << (LBITS - 8); val_ |= ((ulong)buf_[pos_]) << (LBITS - 8);