beginnings of new --add-seekpoint option

diff --git a/src/metaflac/main.c b/src/metaflac/main.c
index 7cfdb97..993c81a 100644 (file)
--- a/src/metaflac/main.c
+++ b/src/metaflac/main.c
@@ -82,6 +82,7 @@ static struct share__option long_options_[] = {
        { "set-vc-field", 1, 0, 0 },
        { "import-vc-from", 1, 0, 0 },
        { "export-vc-to", 1, 0, 0 },
+       { "add-seekpoint", 1, 0, 0 },
        { "add-replay-gain", 0, 0, 0 },
        { "add-padding", 1, 0, 0 },
        /* major operations */
@@ -130,6 +131,7 @@ typedef enum {
        OP__SET_VC_FIELD,
        OP__IMPORT_VC_FROM,
        OP__EXPORT_VC_TO,
+       OP__ADD_SEEKPOINT,
        OP__ADD_REPLAY_GAIN,
        OP__ADD_PADDING,
        OP__LIST,
@@ -201,6 +203,10 @@ typedef struct {
 } Argument_FromFile;
 
 typedef struct {
+       char *specification;
+} Argument_AddSeekpoint;
+
+typedef struct {
        unsigned length;
 } Argument_AddPadding;
 
@@ -213,6 +219,7 @@ typedef struct {
                Argument_VcFieldName vc_field_name;
                Argument_VcField vc_field;
                Argument_VcFilename vc_filename;
+               Argument_AddSeekpoint add_seekpoint;
                Argument_AddPadding add_padding;
        } argument;
 } Operation;
@@ -275,6 +282,7 @@ static FLAC__bool parse_uint64(const char *src, FLAC__uint64 *dest);
 static FLAC__bool parse_filename(const char *src, char **dest);
 static FLAC__bool parse_vorbis_comment_field(const char *field_ref, char **field, char **name, char **value, unsigned *length, const char **violation);
 static FLAC__bool parse_vorbis_comment_field_name(const char *field_ref, char **name, const char **violation);
+static FLAC__bool parse_add_seekpoint(const char *in, char **out, const char **violation);
 static FLAC__bool parse_add_padding(const char *in, unsigned *out);
 static FLAC__bool parse_block_number(const char *in, Argument_BlockNumber *out);
 static FLAC__bool parse_block_type(const char *in, Argument_BlockType *out);
@@ -616,6 +624,16 @@ FLAC__bool parse_option(int option_index, const char *option_argument, CommandLi
                        ok = false;
                }
        }
+       else if(0 == strcmp(opt, "add-seekpoint")) {
+               const char *violation;
+               op = append_shorthand_operation(options, OP__ADD_SEEKPOINT);
+               FLAC__ASSERT(0 != option_argument);
+               if(!parse_add_seekpoint(option_argument, &(op->argument.add_seekpoint.specification), &violation)) {
+                       FLAC__ASSERT(0 != violation);
+                       fprintf(stderr, "ERROR (--%s): malformed seekpoint specification \"%s\",\n       %s\n", opt, option_argument, violation);
+                       ok = false;
+               }
+       }
        else if(0 == strcmp(opt, "add-replay-gain")) {
                (void) append_shorthand_operation(options, OP__ADD_REPLAY_GAIN);
        }
@@ -734,6 +752,10 @@ void free_options(CommandLineOptions *options)
                                if(0 != op->argument.vc_filename.value)
                                        free(op->argument.vc_filename.value);
                                break;
+                       case OP__ADD_SEEKPOINT:
+                               if(0 != op->argument.add_seekpoint.specification)
+                                       free(op->argument.add_seekpoint.specification);
+                               break;
                        default:
                                break;
                }
@@ -1208,8 +1230,57 @@ static FLAC__bool parse_vorbis_comment_field_name(const char *field_ref, char **
        return true;
 }
 
+FLAC__bool parse_add_seekpoint(const char *in, char **out, const char **violation)
+{
+       static const char *garbled_ = "garbled specification";
+       const unsigned n = strlen(in);
+
+       FLAC__ASSERT(0 != in);
+       FLAC__ASSERT(0 != out);
+
+       if(n == 0) {
+               *violation = "specification is empty";
+               return false;
+       }
+
+       if(n > strspn(in, "0123456789.Xsx")) {
+               *violation = "specification contains invalid character";
+               return false;
+       }
+
+       if(in[n-1] == 'X') {
+               if(n > 1) {
+                       *violation = garbled_;
+                       return false;
+               }
+       }
+       else if(in[n-1] == 's') {
+               if(n-1 > strspn(in, "0123456789.")) {
+                       *violation = garbled_;
+                       return false;
+               }
+       }
+       else if(in[n-1] == 'x') {
+               if(n-1 > strspn(in, "0123456789")) {
+                       *violation = garbled_;
+                       return false;
+               }
+       }
+       else {
+               if(n > strspn(in, "0123456789")) {
+                       *violation = garbled_;
+                       return false;
+               }
+       }
+
+       *out = local_strdup(in);
+       return true;
+}
+
 FLAC__bool parse_add_padding(const char *in, unsigned *out)
 {
+       FLAC__ASSERT(0 != in);
+       FLAC__ASSERT(0 != out);
        *out = (unsigned)strtoul(in, 0, 10);
        return *out < (1u << FLAC__STREAM_METADATA_LENGTH_LEN);
 }