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cleanup: Fix fread() and fwrite() error handling

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Cleaned up some of the incorrect uses of fread() and fwrite(), mostly in
the format modules. Neither of these functions will ever return a value
less than 0, which we were checking for in some cases.

I've introduced a fair amount of duplication in the format modules, but
I plan to change how format modules work internally in a subsequent
patch set, so this is simply a stop-gap.

Change-Id: I8ca1cd47c20b2c0b72088bd13b9046f6977aa872
This commit is contained in:
Sean Bright
2017-04-21 13:04:44 -04:00
parent f7ca69809a
commit 1b50df78d0
21 changed files with 227 additions and 70 deletions
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16
formats/format_h264.c
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@@ -52,7 +52,7 @@ struct h264_desc {
static int h264_open(struct ast_filestream *s)
{
unsigned int ts;
if (fread(&ts, 1, sizeof(ts), s->f) < sizeof(ts)) {
if (fread(&ts, 1, sizeof(ts), s->f) != sizeof(ts)) {
ast_log(LOG_WARNING, "Empty file!\n");
return -1;
}
@@ -68,7 +68,7 @@ static struct ast_frame *h264_read(struct ast_filestream *s, int *whennext)
struct h264_desc *fs = (struct h264_desc *)s->_private;
/* Send a frame from the file to the appropriate channel */
if ((res = fread(&len, 1, sizeof(len), s->f)) < 1)
if ((res = fread(&len, 1, sizeof(len), s->f)) != sizeof(len))
return NULL;
len = ntohs(len);
mark = (len & FRAME_ENDED) ? 1 : 0;
@@ -79,8 +79,16 @@ static struct ast_frame *h264_read(struct ast_filestream *s, int *whennext)
}
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, len);
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
if (res)
ast_log(LOG_WARNING, "Short read (%d of %d) (%s)!\n", res, len, strerror(errno));
if (feof(s->f)) {
if (res) {
ast_log(LOG_WARNING, "Incomplete frame data at end of %s file "
"(expected %d bytes, read %d)\n",
ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res);
}
} else {
ast_log(LOG_ERROR, "Error while reading %s file: %s\n",
ast_format_get_name(s->fr.subclass.format), strerror(errno));
}
return NULL;
}
s->fr.samples = fs->lastts;