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/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2010 Google Inc. See LICENSE for details.
* Author: Josh Haberman <jhaberman@gmail.com>
*/
#include "upb_stdio.h"
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
// We can make this configurable if necessary.
#define BUF_SIZE 32768
/* upb_bytesrc methods ********************************************************/
int upb_stdio_cmpbuf(const void *_key, const void *_elem) {
const uint64_t *ofs = _key;
const upb_stdio_buf *buf = _elem;
return (*ofs / BUF_SIZE) - (buf->ofs / BUF_SIZE);
}
static upb_stdio_buf *upb_stdio_findbuf(upb_stdio *s, uint64_t ofs) {
// TODO: it is probably faster to linear search short lists, and to
// special-case the last one or two bufs.
return bsearch(&ofs, s->bufs, s->nbuf, sizeof(*s->bufs), &upb_stdio_cmpbuf);
}
//static upb_strlen_t upb_stdio_read(void *src, uint32_t ofs, upb_buf *b,
// upb_status *status) {
// upb_stdio *stdio = (upb_stdio*)src;
// size_t read = fread(buf, 1, BLOCK_SIZE, stdio->file);
// if(read < (size_t)BLOCK_SIZE) {
// // Error or EOF.
// if(feof(stdio->file)) {
// upb_seterr(status, UPB_EOF, "");
// } else if(ferror(stdio->file)) {
// upb_status_fromerrno(s);
// return 0;
// }
// }
// b->len = read;
// stdio->next_ofs += read;
// return stdio->next_ofs;
//}
size_t upb_stdio_fetch(void *src, uint64_t ofs, upb_status *s) {
(void)src;
(void)ofs;
(void)s;
return 0;
}
void upb_stdio_read(void *src, uint64_t src_ofs, size_t len, char *dst) {
upb_stdio_buf *buf = upb_stdio_findbuf(src, src_ofs);
src_ofs -= buf->ofs;
memcpy(dst, &buf->data[src_ofs], BUF_SIZE - src_ofs);
len -= (BUF_SIZE - src_ofs);
dst += (BUF_SIZE - src_ofs);
while (len > 0) {
++buf;
size_t bytes = UPB_MIN(len, BUF_SIZE);
memcpy(dst, buf->data, bytes);
len -= bytes;
dst += bytes;
}
}
const char *upb_stdio_getptr(void *src, uint64_t ofs, size_t *len) {
upb_stdio_buf *buf = upb_stdio_findbuf(src, ofs);
ofs -= buf->ofs;
*len = BUF_SIZE - ofs;
return &buf->data[ofs];
}
void upb_stdio_refregion(void *src, uint64_t ofs, size_t len) {
upb_stdio_buf *buf = upb_stdio_findbuf(src, ofs);
len -= (BUF_SIZE - ofs);
++buf->refcount;
while (len > 0) {
++buf;
++buf->refcount;
}
}
void upb_stdio_unrefregion(void *src, uint64_t ofs, size_t len) {
(void)src;
(void)ofs;
(void)len;
}
/* upb_bytesink methods *******************************************************/
#if 0
upb_strlen_t upb_stdio_putstr(upb_bytesink *sink, upb_string *str, upb_status *status) {
upb_stdio *stdio = (upb_stdio*)((char*)sink - offsetof(upb_stdio, sink));
upb_strlen_t len = upb_string_len(str);
upb_strlen_t written = fwrite(upb_string_getrobuf(str), 1, len, stdio->file);
if(written < len) {
upb_status_setf(status, UPB_ERROR, "Error writing to stdio stream.");
return -1;
}
return written;
}
#endif
uint32_t upb_stdio_vprintf(upb_bytesink *sink, upb_status *status,
const char *fmt, va_list args) {
upb_stdio *stdio = (upb_stdio*)((char*)sink - offsetof(upb_stdio, sink));
int written = vfprintf(stdio->file, fmt, args);
if (written < 0) {
upb_status_setf(status, UPB_ERROR, "Error writing to stdio stream.");
return -1;
}
return written;
}
void upb_stdio_init(upb_stdio *stdio) {
static upb_bytesrc_vtbl bytesrc_vtbl = {
upb_stdio_fetch,
upb_stdio_read,
upb_stdio_getptr,
upb_stdio_refregion,
upb_stdio_unrefregion,
NULL,
NULL
};
upb_bytesrc_init(&stdio->src, &bytesrc_vtbl);
//static upb_bytesink_vtbl bytesink_vtbl = {
// upb_stdio_putstr,
// upb_stdio_vprintf
//};
//upb_bytesink_init(&stdio->bytesink, &bytesink_vtbl);
}
void upb_stdio_reset(upb_stdio* stdio, FILE *file) {
stdio->file = file;
stdio->should_close = false;
}
void upb_stdio_open(upb_stdio *stdio, const char *filename, const char *mode,
upb_status *s) {
FILE *f = fopen(filename, mode);
if (!f) {
upb_status_fromerrno(s);
return;
}
setvbuf(stdio->file, NULL, _IONBF, 0); // Disable buffering; we do our own.
upb_stdio_reset(stdio, f);
stdio->should_close = true;
}
void upb_stdio_uninit(upb_stdio *stdio) {
// Can't report status; caller should flush() to ensure data is written.
if (stdio->should_close) fclose(stdio->file);
stdio->file = NULL;
}
upb_bytesrc* upb_stdio_bytesrc(upb_stdio *stdio) { return &stdio->src; }
upb_bytesink* upb_stdio_bytesink(upb_stdio *stdio) { return &stdio->sink; }
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