Implemented upb_stdio (upb_bytesrc/upb_bytesink).

pull/13171/head
Joshua Haberman 15 years ago
parent c53921d2fe
commit 57ad204cea
  1. 61
      stream/upb_stdio.c
  2. 42
      stream/upb_stdio.h

@ -0,0 +1,61 @@
/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2010 Joshua Haberman. See LICENSE for details.
*/
#include "upb_stdio.h"
// We can make this configurable if necessary.
#define BLOCK_SIZE 4096
struct upb_stdio {
upb_bytesrc bytesrc;
upb_bytesink bytesink;
FILE *file;
}
static bool upb_stdio_read(upb_stdio *stdio, upb_string *str,
int offset, int bytes_to_read) {
char *buf = upb_string_getrwbuf(offset + bytes_to_read) + offset;
size_t read = fread(buf, 1, bytes_to_read, stdio->file);
if(read < bytes_to_read) {
// Error or EOF.
stdio->bytesrc.eof = feof(stdio->file);
if(ferror(stdio->file)) {
upb_seterr(&stdio->bytesrc.status, UPB_STATUS_ERROR,
"Error reading from stdio stream.");
return false;
}
// Resize to actual read size.
upb_string_getrwbuf(str, offset + read);
}
return true;
}
bool upb_stdio_get(upb_bytesrc *src, upb_string *str, upb_strlen_t minlen) {
// We ignore "minlen" since the stdio interfaces always return a full read
// unless they are at EOF.
(void)minlen;
return upb_stdio_read((upb_stdio*)src, str, 0, BLOCK_SIZE);
}
bool upb_stdio_append(upb_bytesrc *src, upb_string *str, upb_strlen_t len) {
return upb_stdio_read((upb_stdio*)src, str, upb_string_len(str), len);
}
int32_t upb_bytesink_put(upb_bytesink *sink, upb_string *str) {
upb_stdio *stdio = (upb_stdio*)sink - offsetof(upb_stdio, bytesink);
upb_strlen_t len = upb_string_len(str);
size_t written = fwrite(upb_string_getrobuf(str), 1, len, stdio->file);
if(written < len) {
// Error or EOF.
stdio->bytesink.eof = feof(stdio->file);
if(ferror(stdio->file)) {
upb_seterr(&stdio->bytesink.status, UPB_STATUS_ERROR,
"Error writing to stdio stream.");
return 0;
}
}
return written;
}

@ -0,0 +1,42 @@
/*
* upb - a minimalist implementation of protocol buffers.
*
* This file provides upb_bytesrc and upb_bytesink implementations for
* ANSI C stdio.
*
* Copyright (c) 2010 Joshua Haberman. See LICENSE for details.
*/
#include <stdio.h>
#include "upb_stream.h"
#ifndef UPB_STDIO_H_
#define UPB_STDIO_H_
#ifdef __cplusplus
extern "C" {
#endif
struct upb_stdio;
typedef struct upb_stdio upb_stdio;
// Creation/deletion.
upb_stdio_ *upb_stdio__new();
void upb_stdio_free(upb_stdio *stdio);
// Reset/initialize the object for use. The src or sink will call
// fread()/fwrite()/etc. on the given FILE*.
void upb_stdio_reset(upb_stdio *stdio, FILE* file);
// Gets a bytesrc or bytesink for the given stdio. The returned pointer is
// invalidated by upb_stdio_reset above. It is perfectly valid to get both
// a bytesrc and a bytesink for the same stdio if the FILE* is open for reading
// and writing.
upb_bytesrc* upb_stdio_bytesrc(upb_stdio *stdio);
upb_bytesink* upb_stdio_bytesink(upb_stdio *stdio);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif
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