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jsonparser.cpp
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64 lines (59 loc) · 1.92 KB
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#include "simdjson/jsonparser.h"
#ifdef _MSC_VER
#include <windows.h>
#include <sysinfoapi.h>
#else
#include <unistd.h>
#endif
extern bool json_parse(const char * buf, size_t len, ParsedJson &pj, bool reallocifneeded);
extern bool json_parse(const std::string_view &s, ParsedJson &pj, bool reallocifneeded);
extern ParsedJson build_parsed_json(const char * buf, size_t len, bool reallocifneeded);
extern ParsedJson build_parsed_json(const std::string_view &s, bool reallocifneeded);
// parse a document found in buf, need to preallocate ParsedJson.
WARN_UNUSED
bool json_parse(const uint8_t *buf, size_t len, ParsedJson &pj, bool reallocifneeded) {
if (pj.bytecapacity < len) {
std::cerr << "Your ParsedJson cannot support documents that big: " << len
<< std::endl;
return false;
}
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 false;
memcpy((void*)buf,tmpbuf,len);
reallocated = true;
}
}
bool isok = find_structural_bits(buf, len, pj);
if (isok) {
isok = unified_machine(buf, len, pj);
} else {
if(reallocated) free((void*)buf);
return false;
}
if(reallocated) free((void*)buf);
return isok;
}
WARN_UNUSED
ParsedJson build_parsed_json(const uint8_t *buf, size_t len, bool reallocifneeded) {
ParsedJson pj;
bool ok = pj.allocateCapacity(len);
if(ok) {
ok = json_parse(buf, len, pj, reallocifneeded);
assert(ok == pj.isValid());
} else {
std::cerr << "failure during memory allocation " << std::endl;
}
return pj;
}