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add setloadfile and setfileexists functions to flatbuffers

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to allow for custom file loaders. The targeted use case is android runtime.

(from CL 116980408)

Change-Id: I8785c0acf714fab41d8f6fc9f1c52875423b8f5b
This commit is contained in:
Wouter van Oortmerssen
2016-03-30 17:34:52 -07:00
parent c8c0082413
commit e98b1912b3
4 changed files with 87 additions and 22 deletions
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33
include/flatbuffers/util.h
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@@ -111,33 +111,24 @@ inline int64_t StringToUInt(const char *str, int base = 10) {
#endif
}
typedef bool (*LoadFileFunction)(const char *filename, bool binary,
std::string *dest);
typedef bool (*FileExistsFunction)(const char *filename);
LoadFileFunction SetLoadFileFunction(LoadFileFunction load_file_function);
FileExistsFunction SetFileExistsFunction(FileExistsFunction
file_exists_function);
// Check if file "name" exists.
inline bool FileExists(const char *name) {
std::ifstream ifs(name);
return ifs.good();
}
bool FileExists(const char *name);
// Load file "name" into "buf" returning true if successful
// false otherwise. If "binary" is false data is read
// using ifstream's text mode, otherwise data is read with
// no transcoding.
inline bool LoadFile(const char *name, bool binary, std::string *buf) {
std::ifstream ifs(name, binary ? std::ifstream::binary : std::ifstream::in);
if (!ifs.is_open()) return false;
if (binary) {
// The fastest way to read a file into a string.
ifs.seekg(0, std::ios::end);
(*buf).resize(static_cast<size_t>(ifs.tellg()));
ifs.seekg(0, std::ios::beg);
ifs.read(&(*buf)[0], (*buf).size());
} else {
// This is slower, but works correctly on all platforms for text files.
std::ostringstream oss;
oss << ifs.rdbuf();
*buf = oss.str();
}
return !ifs.bad();
}
bool LoadFile(const char *name, bool binary, std::string *buf);
// Save data "buf" of length "len" bytes into a file
// "name" returning true if successful, false otherwise.