Major surgery.

src/jsonparser.cpp

@@ -0,0 +1,65 @@
+#include "jsonparser.h"
+
+// allocate a ParsedJson structure that can support document
+// up to len bytes.
+// returns NULL if memory cannot be allocated
+// This structure is meant to be reused from document to document, as needed.
+// you can use deallocate_ParsedJson to deallocate the memory.
+ParsedJson *allocate_ParsedJson(size_t len) {
+  if (len > 0xffffff) {
+    std::cerr << "Currently only support JSON files < 16MB, requested length: "
+              << len << std::endl;
+    return NULL;
+  }
+  ParsedJson *pj_ptr = new ParsedJson;
+  if (pj_ptr == NULL) {
+    std::cerr << "Could not allocate memory for core struct." << std::endl;
+    return NULL;
+  }
+  ParsedJson &pj(*pj_ptr);
+  pj.bytecapacity = len;
+  if (posix_memalign((void **)&pj.structurals, 8, ROUNDUP_N(len, 64) / 8)) {
+    std::cerr << "Could not allocate memory for structurals" << std::endl;
+    delete pj_ptr;
+    return NULL;
+  };
+  pj.n_structural_indexes = 0;
+  u32 max_structures = ROUNDUP_N(len, 64) + 2 + 7;
+  pj.structural_indexes = new u32[max_structures];
+  if (pj.structural_indexes == NULL) {
+    std::cerr << "Could not allocate memory for structural_indexes"
+              << std::endl;
+    delete[] pj.structurals;
+    delete pj_ptr;
+    return NULL;
+  }
+  return pj_ptr;
+}
+
+void deallocate_ParsedJson(ParsedJson *pj_ptr) {
+  if (pj_ptr == NULL)
+    return;
+  delete[] pj_ptr->structural_indexes;
+  delete[] pj_ptr->structurals;
+  delete pj_ptr;
+}
+
+// parse a document found in buf, need to preallocate ParsedJson.
+bool json_parse(const u8 *buf, size_t len, ParsedJson &pj) {
+  if (pj.bytecapacity < len) {
+    std::cerr << "Your ParsedJson cannot support documents that big: " << len
+              << std::endl;
+    return false;
+  }
+  bool isok = find_structural_bits(buf, len, pj);
+  if (isok) {
+    isok = flatten_indexes(len, pj);
+  }
+  if (isok) {
+    isok = ape_machine(buf, len, pj);
+  }
+  if (isok) {
+    isok = shovel_machine(buf, len, pj);
+  }
+  return isok;
+}