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Start factoring out protocol buffer handling code

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Eric Fischer
2016-04-22 12:00:19 -07:00
parent 2607a76c63
commit b91e8f6d3e
6 changed files with 84 additions and 135 deletions
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decode.cc
+1 -40
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@@ -10,6 +10,7 @@
#include <sys/mman.h>
#include <google/protobuf/io/zero_copy_stream_impl_lite.h>
#include <google/protobuf/io/coded_stream.h>
#include "protobuf.hh"
#include "vector_tile.pb.h"
#include "tile.h"
@@ -17,46 +18,6 @@ extern "C" {
#include "projection.h"
}
// https://github.com/mapbox/mapnik-vector-tile/blob/master/src/vector_tile_compression.hpp
inline bool is_compressed(std::string const &data) {
return data.size() > 2 && (((uint8_t) data[0] == 0x78 && (uint8_t) data[1] == 0x9C) || ((uint8_t) data[0] == 0x1F && (uint8_t) data[1] == 0x8B));
}
// https://github.com/mapbox/mapnik-vector-tile/blob/master/src/vector_tile_compression.hpp
inline int decompress(std::string const &input, std::string &output) {
z_stream inflate_s;
inflate_s.zalloc = Z_NULL;
inflate_s.zfree = Z_NULL;
inflate_s.opaque = Z_NULL;
inflate_s.avail_in = 0;
inflate_s.next_in = Z_NULL;
if (inflateInit2(&inflate_s, 32 + 15) != Z_OK) {
fprintf(stderr, "error: %s\n", inflate_s.msg);
}
inflate_s.next_in = (Bytef *) input.data();
inflate_s.avail_in = input.size();
size_t length = 0;
do {
output.resize(length + 2 * input.size());
inflate_s.avail_out = 2 * input.size();
inflate_s.next_out = (Bytef *) (output.data() + length);
int ret = inflate(&inflate_s, Z_FINISH);
if (ret != Z_STREAM_END && ret != Z_OK && ret != Z_BUF_ERROR) {
fprintf(stderr, "error: %s\n", inflate_s.msg);
return 0;
}
length += (2 * input.size() - inflate_s.avail_out);
} while (inflate_s.avail_out == 0);
inflateEnd(&inflate_s);
output.resize(length);
return 1;
}
int dezig(unsigned n) {
return (n >> 1) ^ (-(n & 1));
}
void printq(const char *s) {
putchar('"');
for (; *s; s++) {