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55 lines (53 loc) · 1.63 KB
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Copy pathjsonparser.cpp
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55 lines (53 loc) · 1.63 KB
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#include "simdjson/jsonparser.h"
#ifdef _MSC_VER
#include <windows.h>
#include <sysinfoapi.h>
#else
#include <unistd.h>
#endif
#include "simdjson/simdjson.h"
// parse a document found in buf, need to preallocate ParsedJson.
WARN_UNUSED
int json_parse(const uint8_t *buf, size_t len, ParsedJson &pj, bool reallocifneeded) {
if (pj.bytecapacity < len) {
return simdjson::CAPACITY;
}
bool reallocated = false;
if(reallocifneeded) {
// realloc is needed if the end of the memory crosses a page
#ifdef _MSC_VER
SYSTEM_INFO sysInfo;
GetSystemInfo(&sysInfo);
long pagesize = sysInfo.dwPageSize;
#else
long pagesize = sysconf (_SC_PAGESIZE);
#endif
if ( (reinterpret_cast<uintptr_t>(buf + len - 1) % pagesize ) < SIMDJSON_PADDING ) {
const uint8_t *tmpbuf = buf;
buf = (uint8_t *) allocate_padded_buffer(len);
if(buf == NULL) return simdjson::MEMALLOC;
memcpy((void*)buf,tmpbuf,len);
reallocated = true;
}
}
// find_structural_bits returns a boolean, not an int, we invert its result to keep consistent with res == 0 meaning success
int res = !find_structural_bits(buf, len, pj);
if (!res) {
res = unified_machine(buf, len, pj);
}
if(reallocated) { aligned_free((void*)buf);}
return res;
}
WARN_UNUSED
ParsedJson build_parsed_json(const uint8_t *buf, size_t len, bool reallocifneeded) {
ParsedJson pj;
bool ok = pj.allocateCapacity(len);
if(ok) {
int res = json_parse(buf, len, pj, reallocifneeded);
ok = res == simdjson::SUCCESS;
assert(ok == pj.isValid());
} else {
std::cerr << "failure during memory allocation " << std::endl;
}
return pj;
}