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/*
** Common functionality for tests.
**/
#ifndef UPB_TEST_UTIL_H_
#define UPB_TEST_UTIL_H_
#include <stdio.h>
#include <math.h>
#include "tests/upb_test.h"
#include "upb/env.h"
#include "upb/sink.h"
upb::BufferHandle global_handle;
// A convenience class for parser tests. Provides some useful features:
//
// - can support multiple calls to parse, to test the parser's handling
// of buffer seams.
//
// - can output verbose output about each parse call when requested, for
// ease of debugging.
//
// - can pass NULL for skipped regions of the input if requested.
//
// - allocates and passes a separate buffer for each parsed region, to
// ensure that the parser is not erroneously overreading its buffer.
class VerboseParserEnvironment {
public:
// Pass verbose=true to print detailed diagnostics to stderr.
VerboseParserEnvironment(bool verbose) : verbose_(verbose) {
env_.ReportErrorsTo(&status_);
}
void Reset(const char *buf, size_t len, bool may_skip) {
buf_ = buf;
len_ = len;
ofs_ = 0;
skip_until_ = may_skip ? 0 : -1;
skipped_with_null_ = false;
status_.Clear();
}
// The user should call a series of:
//
// Reset(buf, len, may_skip);
// Start()
// ParseBuffer(X);
// ParseBuffer(Y);
// // Repeat ParseBuffer as desired, but last call should pass -1.
// ParseBuffer(-1);
// End();
bool Start() {
if (verbose_) {
fprintf(stderr, "Calling start()\n");
}
return sink_->Start(len_, &subc_);
}
bool End() {
if (verbose_) {
fprintf(stderr, "Calling end()\n");
}
return sink_->End();
}
bool ParseBuffer(int bytes) {
if (bytes < 0) {
bytes = len_ - ofs_;
}
ASSERT((size_t)bytes <= (len_ - ofs_));
// Copy buffer into a separate, temporary buffer.
// This is necessary to verify that the parser is not erroneously
// reading outside the specified bounds.
char *buf2 = NULL;
if ((int)(ofs_ + bytes) <= skip_until_) {
skipped_with_null_ = true;
} else {
buf2 = (char*)malloc(bytes);
assert(buf2);
memcpy(buf2, buf_ + ofs_, bytes);
}
if (buf2 == NULL && bytes == 0) {
// Decoders dont' support buf=NULL, bytes=0.
return true;
}
if (verbose_) {
fprintf(stderr, "Calling parse(%u) for bytes %u-%u of the input\n",
(unsigned)bytes, (unsigned)ofs_, (unsigned)(ofs_ + bytes));
}
int parsed = sink_->PutBuffer(subc_, buf2, bytes, &global_handle);
free(buf2);
if (verbose_) {
if (parsed == bytes) {
fprintf(stderr,
"parse(%u) = %u, complete byte count indicates success\n",
(unsigned)bytes, (unsigned)bytes);
} else if (parsed > bytes) {
fprintf(stderr,
"parse(%u) = %u, long byte count indicates success and skip "
"of the next %u bytes\n",
(unsigned)bytes, (unsigned)parsed, (unsigned)(parsed - bytes));
} else {
fprintf(stderr,
"parse(%u) = %u, short byte count indicates failure; "
"last %u bytes were not consumed\n",
(unsigned)bytes, (unsigned)parsed, (unsigned)(bytes - parsed));
}
}
if (!status_.ok())
return false;
if (parsed > bytes && skip_until_ >= 0) {
skip_until_ = ofs_ + parsed;
}
ofs_ += UPB_MIN(parsed, bytes);
return true;
}
void ResetBytesSink(upb::BytesSink* sink) {
sink_ = sink;
}
const upb::Status& status() { return status_; }
size_t ofs() { return ofs_; }
upb::Environment* env() { return &env_; }
bool SkippedWithNull() { return skipped_with_null_; }
private:
upb::Environment env_;
upb::Status status_;
upb::BytesSink* sink_;
const char* buf_;
size_t len_;
bool verbose_;
size_t ofs_;
void *subc_;
// When our parse call returns a value greater than the number of bytes
// we passed in, the decoder is indicating to us that the next N bytes
// in the stream are not needed and can be skipped. The user is allowed
// to pass a NULL buffer for those N bytes.
//
// skip_until_ is initially set to 0 if we should do this NULL-buffer
// skipping or -1 if we should not. If we are open to doing NULL-buffer
// skipping and we get an opportunity to do it, we set skip_until to the
// stream offset where we can skip until. The user can then test whether
// this happened by testing SkippedWithNull().
int skip_until_;
bool skipped_with_null_;
};
#endif
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