From: Bert Vermeulen Date: Wed, 27 Aug 2014 22:22:13 +0000 (+0200) Subject: input: sr_input_scan_*() now return a status code. X-Git-Tag: libsigrok-0.4.0~1088 X-Git-Url: https://sigrok.org/gitaction?a=commitdiff_plain;h=4f979115a4206bc1ff72c0319a340cbcad0f4b06;p=libsigrok.git 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. --- diff --git a/include/libsigrok/proto.h b/include/libsigrok/proto.h index c99d4c65..e8aa7ab1 100644 --- a/include/libsigrok/proto.h +++ b/include/libsigrok/proto.h @@ -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); diff --git a/src/input/chronovu_la8.c b/src/input/chronovu_la8.c index 9adfe61a..f1eb921c 100644 --- a/src/input/chronovu_la8.c +++ b/src/input/chronovu_la8.c @@ -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) diff --git a/src/input/csv.c b/src/input/csv.c index ab0830db..2db90854 100644 --- a/src/input/csv.c +++ b/src/input/csv.c @@ -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) diff --git a/src/input/input.c b/src/input/input.c index 3961e429..a5182e2b 100644 --- a/src/input/input.c +++ b/src/input/input.c @@ -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; } /** diff --git a/src/input/vcd.c b/src/input/vcd.c index edddb68b..62b9a090 100644 --- a/src/input/vcd.c +++ b/src/input/vcd.c @@ -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. */ diff --git a/src/input/wav.c b/src/input/wav.c index 9ad6240d..c5abf235 100644 --- a/src/input/wav.c +++ b/src/input/wav.c @@ -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); diff --git a/src/libsigrok-internal.h b/src/libsigrok-internal.h index 092d7d53..2ab6347f 100644 --- a/src/libsigrok-internal.h +++ b/src/libsigrok-internal.h @@ -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);