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Fix integer underflow on verbose output #138

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Fix integer underflow on verbose output #138

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3 changes: 2 additions & 1 deletion src/zopfli/deflate.c
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Original file line number Diff line number Diff line change
Expand Up @@ -926,6 +926,7 @@ void ZopfliDeflate(const ZopfliOptions* options, int btype, int final,
fprintf(stderr,
"Original Size: %lu, Deflate: %lu, Compression: %f%% Removed\n",
(unsigned long)insize, (unsigned long)(*outsize - offset),
100.0 * (double)(insize - (*outsize - offset)) / (double)insize);
100.0 * (double)(ssize_t)(insize - (*outsize - offset))
/ (double)insize);
}
}
2 changes: 1 addition & 1 deletion src/zopfli/gzip_container.c
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Expand Up @@ -119,6 +119,6 @@ void ZopfliGzipCompress(const ZopfliOptions* options,
fprintf(stderr,
"Original Size: %d, Gzip: %d, Compression: %f%% Removed\n",
(int)insize, (int)*outsize,
100.0 * (double)(insize - *outsize) / (double)insize);
100.0 * (double)(ssize_t)(insize - *outsize) / (double)insize);
}
}
2 changes: 1 addition & 1 deletion src/zopfli/zlib_container.c
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Expand Up @@ -74,6 +74,6 @@ void ZopfliZlibCompress(const ZopfliOptions* options,
fprintf(stderr,
"Original Size: %d, Zlib: %d, Compression: %f%% Removed\n",
(int)insize, (int)*outsize,
100.0 * (double)(insize - *outsize) / (double)insize);
100.0 * (double)(ssize_t)(insize - *outsize) / (double)insize);
}
}