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[SkySight] updated compress/decompress functions

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This commit is contained in:
Ilia Platone 2019-01-18 20:49:48 +01:00
parent 881bfd7c11
commit 069ced973a
1 changed files with 12 additions and 11 deletions
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23
mvt.cpp
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@ -79,25 +79,26 @@ int decompress(std::string const &input, std::string &output) {
// https://github.com/mapbox/mapnik-vector-tile/blob/master/src/vector_tile_compression.hpp
int compress(std::string const &input, std::string &output) {
void* next_in = (void*)input.data();
size_t avail_in = input.size();
void* next_out = (void*)output.data();
size_t avail_out = output.size();
size_t output_size = 0;
size_t input_size = 0;
size_t increase = 1024;
struct libdeflate_compressor *deflate_s = libdeflate_alloc_compressor(9);
do {
size_t increase = input.size() / 2 + 1024;
output.resize(avail_in + increase);
avail_out = increase;
next_out = (void*)((long)output.data() + avail_in);
output.resize(output.size() + increase);
int ret = libdeflate_deflate_compress(deflate_s,
next_in, avail_in,
next_out, avail_out);
next_in, increase,
next_out, increase);
if (ret != LIBDEFLATE_SUCCESS) {
return -1;
}
avail_in += (increase - avail_out);
} while (avail_out == 0);
output_size += ret;
input_size += increase;
next_out = (void*)((long)next_out + ret);
next_in = (void*)((long)next_in + increase);
} while ((long)next_in < input.size());
libdeflate_free_compressor(deflate_s);
output.resize(avail_in);
output.resize(output_size);
return 0;
}