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input: sr_input_scan_*() now return a status code. 

SR_OK: a match was found.
SR_ERR: no match.
SR_ERR_DATA: a match was found but the module cannot handle the input.
SR_OK_CONTINUE: some module didn't have enough data to be sure.
This commit is contained in:
Bert Vermeulen 2014-08-28 00:22:13 +02:00
parent aad21bd866
commit 4f979115a4
7 changed files with 79 additions and 54 deletions
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4
include/libsigrok/proto.h
View File

@ -133,8 +133,8 @@ SR_API const struct sr_option **sr_input_options_get(const struct sr_input_modul
SR_API void sr_input_options_free(const struct sr_option **options);
SR_API struct sr_input *sr_input_new(const struct sr_input_module *imod,
GHashTable *options);
SR_API const struct sr_input *sr_input_scan_buffer(GString *buf);
SR_API const struct sr_input *sr_input_scan_file(const char *filename);
SR_API int sr_input_scan_buffer(GString *buf, const struct sr_input **in);
SR_API int sr_input_scan_file(const char *filename, const struct sr_input **in);
SR_API struct sr_dev_inst *sr_input_dev_inst_get(const struct sr_input *in);
SR_API int sr_input_send(const struct sr_input *in, GString *buf);
SR_API int sr_input_free(const struct sr_input *in);

4
src/input/chronovu_la8.c
View File

@ -44,9 +44,9 @@ static int format_match(GHashTable *metadata)
size = GPOINTER_TO_INT(g_hash_table_lookup(metadata,
GINT_TO_POINTER(SR_INPUT_META_FILESIZE)));
if (size == CHRONOVU_LA8_FILESIZE)
return TRUE;
return SR_OK;
return FALSE;
return SR_ERR;
}
static int init(struct sr_input *in, GHashTable *options)

4
src/input/csv.c
View File

@ -138,9 +138,9 @@ static int format_match(GHashTable *metadata)
buf = g_hash_table_lookup(metadata, GINT_TO_POINTER(SR_INPUT_META_MIMETYPE));
if (!strcmp(buf, "text/csv"))
return TRUE;
return SR_OK;
return FALSE;
return SR_ERR;
}
static void strip_comment(char *buf, const GString *prefix)

75
src/input/input.c
View File

@ -308,8 +308,8 @@ static gboolean check_required_metadata(const uint8_t *metadata, uint8_t *avail)
* the input modules to find a match. This is format-dependent, but
* 128 bytes is normally enough.
*
* If an input module is found, an instance is created and returned.
* Otherwise, NULL is returned.
* If an input module is found, an instance is created into *in.
* Otherwise, *in contains NULL.
*
* If an instance is created, it has the given buffer used for scanning
* already submitted to it, to be processed before more data is sent.
@ -318,19 +318,20 @@ static gboolean check_required_metadata(const uint8_t *metadata, uint8_t *avail)
* it again later.
*
*/
SR_API const struct sr_input *sr_input_scan_buffer(GString *buf)
SR_API int sr_input_scan_buffer(GString *buf, const struct sr_input **in)
{
struct sr_input *in;
const struct sr_input_module *imod;
GHashTable *meta;
unsigned int m, i;
int ret;
uint8_t mitem, avail_metadata[8];
/* No more metadata to be had from a buffer. */
avail_metadata[0] = SR_INPUT_META_HEADER;
avail_metadata[1] = 0;
in = NULL;
*in = NULL;
ret = SR_ERR;
for (i = 0; input_module_list[i]; i++) {
imod = input_module_list[i];
if (!imod->metadata[0]) {
@ -353,54 +354,61 @@ SR_API const struct sr_input *sr_input_scan_buffer(GString *buf)
g_hash_table_destroy(meta);
continue;
}
if (!imod->format_match(meta)) {
sr_spew("Trying module %s.", imod->id);
ret = imod->format_match(meta);
g_hash_table_destroy(meta);
if (ret == SR_ERR_DATA) {
/* Module recognized this buffer, but cannot handle it. */
break;
} else if (ret == SR_ERR) {
/* Module didn't recognize this buffer. */
g_hash_table_destroy(meta);
continue;
} else if (ret != SR_OK) {
/* Can be SR_OK_CONTINUE. */
return ret;
}
g_hash_table_destroy(meta);
/* Found a matching module. */
in = sr_input_new(imod, NULL);
g_string_insert_len(in->buf, 0, buf->str, buf->len);
sr_spew("Module %s matched.", imod->id);
*in = sr_input_new(imod, NULL);
g_string_insert_len((*in)->buf, 0, buf->str, buf->len);
break;
}
return in;
return ret;
}
/**
* Try to find an input module that can parse the given file.
*
* If an input module is found, an instance is created and returned.
* Otherwise, NULL is returned.
* If an input module is found, an instance is created into *in.
* Otherwise, *in contains NULL.
*
*/
SR_API const struct sr_input *sr_input_scan_file(const char *filename)
SR_API int sr_input_scan_file(const char *filename, const struct sr_input **in)
{
struct sr_input *in;
const struct sr_input_module *imod;
GHashTable *meta;
GString *header_buf;
struct stat st;
unsigned int midx, m, i;
int fd;
int fd, ret;
ssize_t size;
uint8_t mitem, avail_metadata[8];
if (!filename || !filename[0]) {
sr_err("Invalid filename.");
return NULL;
return SR_ERR_ARG;
}
if (!g_file_test(filename, G_FILE_TEST_EXISTS)) {
sr_err("No such file.");
return NULL;
return SR_ERR_ARG;
}
if (stat(filename, &st) < 0) {
sr_err("%s", strerror(errno));
return NULL;
return SR_ERR_ARG;
}
midx = 0;
@ -409,7 +417,8 @@ SR_API const struct sr_input *sr_input_scan_file(const char *filename)
avail_metadata[midx++] = SR_INPUT_META_HEADER;
/* TODO: MIME type */
in = NULL;
*in = NULL;
ret = SR_ERR;
header_buf = g_string_sized_new(128);
for (i = 0; input_module_list[i]; i++) {
g_string_truncate(header_buf, 0);
@ -430,17 +439,16 @@ SR_API const struct sr_input *sr_input_scan_file(const char *filename)
if (!mitem)
/* Metadata list is 0-terminated. */
break;
if (mitem == SR_INPUT_META_FILENAME)
if (mitem == SR_INPUT_META_FILENAME) {
g_hash_table_insert(meta, GINT_TO_POINTER(mitem),
(gpointer)filename);
else if (mitem == SR_INPUT_META_FILESIZE) {
sr_dbg("inserting fs %d", st.st_size);
} else if (mitem == SR_INPUT_META_FILESIZE) {
g_hash_table_insert(meta, GINT_TO_POINTER(mitem),
GINT_TO_POINTER(st.st_size));
} else if (mitem == SR_INPUT_META_HEADER) {
if ((fd = open(filename, O_RDONLY)) < 0) {
sr_err("%s", strerror(errno));
return NULL;
return SR_ERR;
}
size = read(fd, header_buf->str, 128);
header_buf->len = size;
@ -448,7 +456,7 @@ SR_API const struct sr_input *sr_input_scan_file(const char *filename)
if (size <= 0) {
g_string_free(header_buf, TRUE);
sr_err("%s", strerror(errno));
return NULL;
return SR_ERR;
}
g_hash_table_insert(meta, GINT_TO_POINTER(mitem), header_buf);
}
@ -459,17 +467,28 @@ SR_API const struct sr_input *sr_input_scan_file(const char *filename)
g_hash_table_destroy(meta);
continue;
}
if (!imod->format_match(meta))
sr_spew("Trying module %s.", imod->id);
ret = imod->format_match(meta);
g_hash_table_destroy(meta);
if (ret == SR_ERR_DATA) {
/* Module recognized this buffer, but cannot handle it. */
break;
} else if (ret == SR_ERR) {
/* Module didn't recognize this buffer. */
continue;
} else if (ret != SR_OK) {
/* Can be SR_OK_CONTINUE. */
return ret;
}
/* Found a matching module. */
in = sr_input_new(imod, NULL);
sr_spew("Module %s matched.", imod->id);
*in = sr_input_new(imod, NULL);
break;
}
g_string_free(header_buf, TRUE);
return in;
return ret;
}
/**

2
src/input/vcd.c
View File

@ -257,7 +257,7 @@ static int format_match(GHashTable *metadata)
g_free(name);
g_free(contents);
return status;
return status ? SR_OK : SR_ERR;
}
/* Send N samples of the given value. */

31
src/input/wav.c
View File

@ -57,7 +57,7 @@ static int parse_wav_header(GString *buf, struct context *inc)
unsigned int fmt_code, samplesize, num_channels, unitsize;
if (buf->len < MIN_DATA_CHUNK_OFFSET)
return SR_ERR;
return SR_OK_CONTINUE;
fmt_code = RL16(buf->str + 20);
samplerate = RL32(buf->str + 24);
@ -65,7 +65,7 @@ static int parse_wav_header(GString *buf, struct context *inc)
samplesize = RL16(buf->str + 32);
if (samplesize != 1 && samplesize != 2 && samplesize != 4) {
sr_err("Only 8, 16 or 32 bits per sample supported.");
return SR_ERR;
return SR_ERR_DATA;
}
num_channels = RL16(buf->str + 22);
@ -77,7 +77,7 @@ static int parse_wav_header(GString *buf, struct context *inc)
} else if (fmt_code == WAVE_FORMAT_IEEE_FLOAT) {
if (unitsize != 4) {
sr_err("only 32-bit floats supported.");
return SR_ERR;
return SR_ERR_DATA;
}
} else if (fmt_code == WAVE_FORMAT_EXTENSIBLE) {
if (buf->len < 70)
@ -94,17 +94,17 @@ static int parse_wav_header(GString *buf, struct context *inc)
}
if (RL16(buf->str + 34) != RL16(buf->str + 38)) {
sr_err("Reduced valid bits per sample not supported.");
return SR_ERR;
return SR_ERR_DATA;
}
/* Real format code is the first two bytes of the GUID. */
fmt_code = RL16(buf->str + 44);
if (fmt_code != WAVE_FORMAT_PCM && fmt_code != WAVE_FORMAT_IEEE_FLOAT) {
sr_err("Only PCM and floating point samples are supported.");
return SR_ERR;
return SR_ERR_DATA;
}
} else {
sr_err("Only PCM and floating point samples are supported.");
return SR_ERR;
return SR_ERR_DATA;
}
if (inc) {
@ -122,22 +122,23 @@ static int parse_wav_header(GString *buf, struct context *inc)
static int format_match(GHashTable *metadata)
{
GString *buf;
int ret;
buf = g_hash_table_lookup(metadata, GINT_TO_POINTER(SR_INPUT_META_HEADER));
if (strncmp(buf->str, "RIFF", 4))
return FALSE;
return SR_ERR;
if (strncmp(buf->str + 8, "WAVE", 4))
return FALSE;
return SR_ERR;
if (strncmp(buf->str + 12, "fmt ", 4))
return FALSE;
return SR_ERR;
/*
* Only gets called when we already know this is a WAV file, so
* this parser can log error messages.
*/
if (parse_wav_header(buf, NULL) != SR_OK)
return FALSE;
if ((ret = parse_wav_header(buf, NULL)) != SR_OK)
return ret;
return TRUE;
return SR_OK;
}
static int init(struct sr_input *in, GHashTable *options)
@ -179,7 +180,7 @@ static int initial_receive(struct sr_input *in)
struct sr_channel *ch;
struct sr_config *src;
struct context *inc;
int i;
int ret, i;
char channelname[8];
if (!in->buf)
@ -187,8 +188,8 @@ static int initial_receive(struct sr_input *in)
return SR_ERR;
inc = in->priv = g_malloc(sizeof(struct context));
if (parse_wav_header(in->buf, inc) != SR_OK)
return SR_ERR;
if ((ret = parse_wav_header(in->buf, inc)) != SR_OK)
return ret;
for (i = 0; i < inc->num_channels; i++) {
snprintf(channelname, 8, "CH%d", i + 1);

9
src/libsigrok-internal.h
View File

@ -263,8 +263,13 @@ struct sr_input_module {
*
* @param[in] metadata Metadata the module can use to identify the stream.
*
* @retval TRUE This module knows the format.
* @retval FALSE This module does not know the format.
* @retval SR_OK This module knows the format.
* @retval SR_OK_CONTINUE There wasn't enough data for this module to
* positively identify the format.
* @retval SR_ERR_DATA This module knows the format, but cannot handle it.
* This means the stream is either corrupt, or indicates a feature
* that the module does not support.
* @retval SR_ERR This module does not know the format.
*/
int (*format_match) (GHashTable *metadata);