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/*
* 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;
}
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