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Make sure huffman trees always have valid symbols

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- Symbols added to the tree are valid inside HuffmanTreeBuildExplicit().
- In HuffmanTreeBuildImplicit(), make sure 'root_symbol' is
valid in case of a single symbol tree.

Change-Id: I7de5de71ff28f41e2d6228b29ed8dd4a20813e99
This commit is contained in:
Urvang Joshi
2012-05-10 11:37:17 +05:30
parent 4105061840
commit 14757f8ae2
3 changed files with 14 additions and 6 deletions
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6
src/utils/huffman.h
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@ -56,12 +56,12 @@ int HuffmanTreeBuildImplicit(HuffmanTree* const tree,
int code_lengths_size);
// Build a Huffman tree with explicitly given lists of code lengths, codes
// and symbols.
// Returns false in case of error (invalid tree or memory error).
// and symbols. Verifies that all symbols added are smaller than max_symbol.
// Returns false in case of an invalid symbol, invalid tree or memory error.
int HuffmanTreeBuildExplicit(HuffmanTree* const tree,
const int* const code_lengths,
const int* const codes,
const int* const symbols,
const int* const symbols, int max_symbol,
int num_symbols);
// Utility: converts Huffman code lengths to corresponding Huffman codes.