ensure favorDecSpeed is properly initialized

also :
- fix a potential malloc error
- proper use of ALLOC macro inside lz4hc
- update html API doc

1 files changed, 7 insertions, 5 deletions

diff --git a/doc/lz4_manual.html b/doc/lz4_manual.html
index f8639fe..ddd2724 100644
--- a/doc/lz4_manual.html
+++ b/doc/lz4_manual.html
@@ -126,15 +126,17 @@ int LZ4_compress_fast_extState (void* state, const char* src, char* dst, int src
 
 <pre><b>int LZ4_decompress_fast (const char* src, char* dst, int originalSize);
 </b><p>This function is a bit faster than LZ4_decompress_safe(),
-but doesn't provide any security guarantee.
+but it may misbehave on malformed input because it doesn't perform full validation of compressed data.
     originalSize : is the uncompressed size to regenerate
                    Destination buffer must be already allocated, and its size must be >= 'originalSize' bytes.
     return : number of bytes read from source buffer (== compressed size).
              If the source stream is detected malformed, the function stops decoding and return a negative result.
-    note : This function respects memory boundaries for *properly formed* compressed data.
-           However, it does not provide any protection against malicious input.
-           It also doesn't know 'src' size, and implies it's >= compressed size.
-           Use this function in trusted environment **only**.
+    note : This function is only usable if the originalSize of uncompressed data is known in advance.
+           The caller should also check that all the compressed input has been consumed properly,
+           i.e. that the return value matches the size of the buffer with compressed input.
+           The function never writes past the output buffer.  However, since it doesn't know its 'src' size,
+           it may read past the intended input.  Also, because match offsets are not validated during decoding,
+           reads from 'src' may underflow.  Use this function in trusted environment **only**.
 </p></pre><BR>
 
 <pre><b>int LZ4_decompress_safe_partial (const char* src, char* dst, int srcSize, int targetOutputSize, int dstCapacity);