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y4minput: add some tolerance for read short counts

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Change-Id: Id5d3c536b7494eb3292f33f35c700b5de7034595
This commit is contained in:
James Zern 2014-02-12 16:30:43 -08:00
parent 59853f8fdf
commit df0829fdfc
1 changed files with 32 additions and 8 deletions
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40
y4minput.c
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@ -10,10 +10,37 @@
* Based on code from the OggTheora software codec source code,
* Copyright (C) 2002-2010 The Xiph.Org Foundation and contributors.
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "vpx/vpx_integer.h"
#include "y4minput.h"
// Reads 'size' bytes from 'file' into 'buf' with some fault tolerance.
// Returns true on success.
static int file_read(void *buf, size_t size, FILE *file) {
const int kMaxRetries = 5;
int retry_count = 0;
size_t len = 0;
do {
const size_t n = fread((uint8_t*)buf + len, 1, size - len, file);
len += n;
if (ferror(file)) {
if (errno == EINTR || errno == EAGAIN) {
++retry_count;
clearerr(file);
continue;
} else {
fprintf(stderr, "Error reading file: %u of %u bytes read, %d: %s\n",
(uint32_t)len, (uint32_t)size, errno, strerror(errno));
return 0;
}
}
} while (!feof(file) && len < size && retry_count < kMaxRetries);
return len == size;
}
static int y4m_parse_tags(y4m_input *_y4m, char *_tags) {
int got_w;
int got_h;
@ -670,8 +697,7 @@ int y4m_input_open(y4m_input *_y4m, FILE *_fin, char *_skip, int _nskip,
buffer[i] = *_skip++;
_nskip--;
} else {
ret = (int)fread(buffer + i, 1, 1, _fin);
if (ret < 1)return -1;
if (!file_read(buffer + i, 1, _fin)) return -1;
}
if (buffer[i] == '\n')break;
}
@ -853,10 +879,8 @@ int y4m_input_fetch_frame(y4m_input *_y4m, FILE *_fin, vpx_image_t *_img) {
int c_w;
int c_h;
int c_sz;
int ret;
/*Read and skip the frame header.*/
ret = (int)fread(frame, 1, 6, _fin);
if (ret < 6)return 0;
if (!file_read(frame, 6, _fin)) return 0;
if (memcmp(frame, "FRAME", 5)) {
fprintf(stderr, "Loss of framing in Y4M input data\n");
return -1;
@ -864,19 +888,19 @@ int y4m_input_fetch_frame(y4m_input *_y4m, FILE *_fin, vpx_image_t *_img) {
if (frame[5] != '\n') {
char c;
int j;
for (j = 0; j < 79 && fread(&c, 1, 1, _fin) && c != '\n'; j++);
for (j = 0; j < 79 && file_read(&c, 1, _fin) && c != '\n'; j++) {}
if (j == 79) {
fprintf(stderr, "Error parsing Y4M frame header\n");
return -1;
}
}
/*Read the frame data that needs no conversion.*/
if (fread(_y4m->dst_buf, 1, _y4m->dst_buf_read_sz, _fin) != _y4m->dst_buf_read_sz) {
if (!file_read(_y4m->dst_buf, _y4m->dst_buf_read_sz, _fin)) {
fprintf(stderr, "Error reading Y4M frame data.\n");
return -1;
}
/*Read the frame data that does need conversion.*/
if (fread(_y4m->aux_buf, 1, _y4m->aux_buf_read_sz, _fin) != _y4m->aux_buf_read_sz) {
if (!file_read(_y4m->aux_buf, _y4m->aux_buf_read_sz, _fin)) {
fprintf(stderr, "Error reading Y4M frame data.\n");
return -1;
}