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Improve deflate_decompress() documentation

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This commit is contained in:
Eric Biggers 2016-01-23 11:01:22 -06:00
parent e43a7171de
commit be419e24fa
1 changed files with 14 additions and 6 deletions
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20
libdeflate.h
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@ -128,12 +128,20 @@ deflate_alloc_decompressor(void);
* deflate_decompress() decompresses 'in_nbytes' bytes of DEFLATE-compressed * deflate_decompress() decompresses 'in_nbytes' bytes of DEFLATE-compressed
* data at 'in' and writes the uncompressed data to 'out', which is a buffer of * data at 'in' and writes the uncompressed data to 'out', which is a buffer of
* at least 'out_nbytes_avail' bytes. If decompression was successful, then * at least 'out_nbytes_avail' bytes. If decompression was successful, then
* %true is returned; otherwise, the compressed data must have been invalid and * true is returned; otherwise, false is returned.
* %false is returned. In addition, on success, if 'actual_out_nbytes_ret' is *
* not NULL, then the actual uncompressed size is written to * deflate_decompress() can be used in cases where the actual uncompressed size
* *actual_out_nbytes_ret. Or, if 'actual_out_nbytes_ret' is NULL, then the * is known (recommended) or unknown (not recommended). If the actual
* uncompressed size must be exactly equal to 'out_nbytes_avail'; otherwise * uncompressed size is known, then pass the actual uncompressed size as
* decompression fails and %false is returned. * 'out_nbytes_avail' and pass NULL for 'actual_out_nbytes_ret'. This makes
* deflate_decompress() return false if the data did not decompress to exactly
* the specified number of bytes. Alternatively, if the actual uncompressed
* size is unknown, then provide a non-NULL 'actual_out_nbytes_ret' and provide
* a buffer with some size 'out_nbytes_avail' that you think is large enough to
* hold all the uncompressed data. In this case, if the data decompresses to
* less than or equal to 'out_nbytes_avail' bytes, then deflate_decompress()
* will write the actual uncompressed size to *actual_out_nbytes_ret and return
* true. Otherwise, it will return false.
*/ */
extern bool extern bool
deflate_decompress(struct deflate_decompressor *decompressor, deflate_decompress(struct deflate_decompressor *decompressor,