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- #define ZLIB_INTERNAL
- #include "zlib.h"
- int ZEXPORT compress2 (
- Bytef *dest,
- uLongf *destLen,
- const Bytef *source,
- uLong sourceLen,
- int level)
- {
- z_stream stream;
- int err;
- const uInt max = (uInt)-1;
- uLong left;
- left = *destLen;
- *destLen = 0;
- stream.zalloc = (alloc_func)0;
- stream.zfree = (free_func)0;
- stream.opaque = (voidpf)0;
- err = deflateInit(&stream, level);
- if (err != Z_OK) return err;
- stream.next_out = dest;
- stream.avail_out = 0;
- stream.next_in = (z_const Bytef *)source;
- stream.avail_in = 0;
- do {
- if (stream.avail_out == 0) {
- stream.avail_out = left > (uLong)max ? max : (uInt)left;
- left -= stream.avail_out;
- }
- if (stream.avail_in == 0) {
- stream.avail_in = sourceLen > (uLong)max ? max : (uInt)sourceLen;
- sourceLen -= stream.avail_in;
- }
- err = deflate(&stream, sourceLen ? Z_NO_FLUSH : Z_FINISH);
- } while (err == Z_OK);
- *destLen = stream.total_out;
- deflateEnd(&stream);
- return err == Z_STREAM_END ? Z_OK : err;
- }
- int ZEXPORT compress (
- Bytef *dest,
- uLongf *destLen,
- const Bytef *source,
- uLong sourceLen)
- {
- return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);
- }
- uLong ZEXPORT compressBound (
- uLong sourceLen)
- {
- return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
- (sourceLen >> 25) + 13;
- }
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