[pulseaudio-discuss] [PATCH v2] tagstruct: Refactor writing/reading basic types
David Henningsson
david.henningsson at canonical.com
Mon Feb 23 00:21:21 PST 2015
Acked, but would be good to have Peter's view on it too due to his
tagstruct optimisation patches.
On 2015-02-17 20:40, Tanu Kaskinen wrote:
> While adding functions for writing and reading pa_bvolume structs, I
> found myself wondering if I could make it simpler to write and read
> the basic types that a pa_bvolume consists of, without having to worry
> about network byte ordering, remembering to call extend() and getting
> the length and read index adjustments just right. This is what I came
> up with.
>
> There is a functional change too: previously the
> pa_tagstruct_get_foo() functions didn't modify the read index in case
> of errors, but now, due to read_tag() modifying the read index at an
> early stage, the read index gets modified also in case of errors. I
> have checked the call sites, and I believe there's no code that would
> rely on the "no read index modification on error" property of the old
> functions. If reading anything from a tagstruct fails, the whole
> tagstruct is considered invalid (typically resulting in a protocol
> error and client connection teardown).
> ---
>
> Changes in v2:
>
> Added "inline" to extend().
>
> Renamed check_type() to read_tag().
>
> Replaced this pattern:
>
> if (foo() < 0)
> return -1;
>
> return 0;
>
> with
>
> return foo();
>
> Added a note about the changed behaviour change to the commit message.
>
>
> src/pulsecore/tagstruct.c | 442 ++++++++++++++++++++--------------------------
> 1 file changed, 194 insertions(+), 248 deletions(-)
>
> diff --git a/src/pulsecore/tagstruct.c b/src/pulsecore/tagstruct.c
> index 63134f9..bf123d5 100644
> --- a/src/pulsecore/tagstruct.c
> +++ b/src/pulsecore/tagstruct.c
> @@ -83,7 +83,7 @@ uint8_t* pa_tagstruct_free_data(pa_tagstruct*t, size_t *l) {
> return p;
> }
>
> -static void extend(pa_tagstruct*t, size_t l) {
> +static inline void extend(pa_tagstruct*t, size_t l) {
> pa_assert(t);
> pa_assert(t->dynamic);
>
> @@ -93,133 +93,168 @@ static void extend(pa_tagstruct*t, size_t l) {
> t->data = pa_xrealloc(t->data, t->allocated = t->length+l+100);
> }
>
> +static void write_u8(pa_tagstruct *t, uint8_t u) {
> + extend(t, 1);
> + t->data[t->length++] = u;
> +}
> +
> +static int read_u8(pa_tagstruct *t, uint8_t *u) {
> + if (t->rindex + 1 > t->length)
> + return -1;
> +
> + *u = t->data[t->rindex++];
> + return 0;
> +}
> +
> +static void write_u32(pa_tagstruct *t, uint32_t u) {
> + extend(t, 4);
> + u = htonl(u);
> + memcpy(t->data + t->length, &u, 4);
> + t->length += 4;
> +}
> +
> +static int read_u32(pa_tagstruct *t, uint32_t *u) {
> + if (t->rindex + 4 > t->length)
> + return -1;
> +
> + memcpy(u, t->data + t->rindex, 4);
> + *u = ntohl(*u);
> + t->rindex += 4;
> +
> + return 0;
> +}
> +
> +static void write_u64(pa_tagstruct *t, uint64_t u) {
> + write_u32(t, u >> 32);
> + write_u32(t, u);
> +}
> +
> +static int read_u64(pa_tagstruct *t, uint64_t *u) {
> + uint32_t tmp;
> +
> + if (read_u32(t, &tmp) < 0)
> + return -1;
> +
> + *u = ((uint64_t) tmp) << 32;
> +
> + if (read_u32(t, &tmp) < 0)
> + return -1;
> +
> + *u |= tmp;
> + return 0;
> +}
> +
> +static int read_s64(pa_tagstruct *t, int64_t *u) {
> + uint32_t tmp;
> +
> + if (read_u32(t, &tmp) < 0)
> + return -1;
> +
> + *u = (int64_t) (((uint64_t) tmp) << 32);
> +
> + if (read_u32(t, &tmp) < 0)
> + return -1;
> +
> + *u |= (int64_t) tmp;
> + return 0;
> +}
> +
> +static void write_arbitrary(pa_tagstruct *t, const void *p, size_t len) {
> + extend(t, len);
> +
> + if (len > 0)
> + memcpy(t->data + t->length, p, len);
> +
> + t->length += len;
> +}
> +
> +static int read_arbitrary(pa_tagstruct *t, const void **p, size_t length) {
> + if (t->rindex + length > t->length)
> + return -1;
> +
> + *p = t->data + t->rindex;
> + t->rindex += length;
> + return 0;
> +}
> +
> void pa_tagstruct_puts(pa_tagstruct*t, const char *s) {
> size_t l;
> pa_assert(t);
>
> if (s) {
> - l = strlen(s)+2;
> - extend(t, l);
> - t->data[t->length] = PA_TAG_STRING;
> - strcpy((char*) (t->data+t->length+1), s);
> - t->length += l;
> - } else {
> - extend(t, 1);
> - t->data[t->length] = PA_TAG_STRING_NULL;
> - t->length += 1;
> - }
> + write_u8(t, PA_TAG_STRING);
> + l = strlen(s)+1;
> + write_arbitrary(t, s, l);
> + } else
> + write_u8(t, PA_TAG_STRING_NULL);
> }
>
> void pa_tagstruct_putu32(pa_tagstruct*t, uint32_t i) {
> pa_assert(t);
>
> - extend(t, 5);
> - t->data[t->length] = PA_TAG_U32;
> - i = htonl(i);
> - memcpy(t->data+t->length+1, &i, 4);
> - t->length += 5;
> + write_u8(t, PA_TAG_U32);
> + write_u32(t, i);
> }
>
> void pa_tagstruct_putu8(pa_tagstruct*t, uint8_t c) {
> pa_assert(t);
>
> - extend(t, 2);
> - t->data[t->length] = PA_TAG_U8;
> - *(t->data+t->length+1) = c;
> - t->length += 2;
> + write_u8(t, PA_TAG_U8);
> + write_u8(t, c);
> }
>
> void pa_tagstruct_put_sample_spec(pa_tagstruct *t, const pa_sample_spec *ss) {
> - uint32_t rate;
> -
> pa_assert(t);
> pa_assert(ss);
>
> - extend(t, 7);
> - t->data[t->length] = PA_TAG_SAMPLE_SPEC;
> - t->data[t->length+1] = (uint8_t) ss->format;
> - t->data[t->length+2] = ss->channels;
> - rate = htonl(ss->rate);
> - memcpy(t->data+t->length+3, &rate, 4);
> - t->length += 7;
> + write_u8(t, PA_TAG_SAMPLE_SPEC);
> + write_u8(t, ss->format);
> + write_u8(t, ss->channels);
> + write_u32(t, ss->rate);
> }
>
> void pa_tagstruct_put_arbitrary(pa_tagstruct *t, const void *p, size_t length) {
> - uint32_t tmp;
> -
> pa_assert(t);
> pa_assert(p);
>
> - extend(t, 5+length);
> - t->data[t->length] = PA_TAG_ARBITRARY;
> - tmp = htonl((uint32_t) length);
> - memcpy(t->data+t->length+1, &tmp, 4);
> - if (length)
> - memcpy(t->data+t->length+5, p, length);
> - t->length += 5+length;
> + write_u8(t, PA_TAG_ARBITRARY);
> + write_u32(t, length);
> + write_arbitrary(t, p, length);
> }
>
> void pa_tagstruct_put_boolean(pa_tagstruct*t, bool b) {
> pa_assert(t);
>
> - extend(t, 1);
> - t->data[t->length] = (uint8_t) (b ? PA_TAG_BOOLEAN_TRUE : PA_TAG_BOOLEAN_FALSE);
> - t->length += 1;
> + write_u8(t, b ? PA_TAG_BOOLEAN_TRUE : PA_TAG_BOOLEAN_FALSE);
> }
>
> void pa_tagstruct_put_timeval(pa_tagstruct*t, const struct timeval *tv) {
> - uint32_t tmp;
> pa_assert(t);
>
> - extend(t, 9);
> - t->data[t->length] = PA_TAG_TIMEVAL;
> - tmp = htonl((uint32_t) tv->tv_sec);
> - memcpy(t->data+t->length+1, &tmp, 4);
> - tmp = htonl((uint32_t) tv->tv_usec);
> - memcpy(t->data+t->length+5, &tmp, 4);
> - t->length += 9;
> + write_u8(t, PA_TAG_TIMEVAL);
> + write_u32(t, tv->tv_sec);
> + write_u32(t, tv->tv_usec);
> }
>
> void pa_tagstruct_put_usec(pa_tagstruct*t, pa_usec_t u) {
> - uint32_t tmp;
> -
> pa_assert(t);
>
> - extend(t, 9);
> - t->data[t->length] = PA_TAG_USEC;
> - tmp = htonl((uint32_t) (u >> 32));
> - memcpy(t->data+t->length+1, &tmp, 4);
> - tmp = htonl((uint32_t) u);
> - memcpy(t->data+t->length+5, &tmp, 4);
> - t->length += 9;
> + write_u8(t, PA_TAG_USEC);
> + write_u64(t, u);
> }
>
> void pa_tagstruct_putu64(pa_tagstruct*t, uint64_t u) {
> - uint32_t tmp;
> -
> pa_assert(t);
>
> - extend(t, 9);
> - t->data[t->length] = PA_TAG_U64;
> - tmp = htonl((uint32_t) (u >> 32));
> - memcpy(t->data+t->length+1, &tmp, 4);
> - tmp = htonl((uint32_t) u);
> - memcpy(t->data+t->length+5, &tmp, 4);
> - t->length += 9;
> + write_u8(t, PA_TAG_U64);
> + write_u64(t, u);
> }
>
> void pa_tagstruct_puts64(pa_tagstruct*t, int64_t u) {
> - uint32_t tmp;
> -
> pa_assert(t);
>
> - extend(t, 9);
> - t->data[t->length] = PA_TAG_S64;
> - tmp = htonl((uint32_t) ((uint64_t) u >> 32));
> - memcpy(t->data+t->length+1, &tmp, 4);
> - tmp = htonl((uint32_t) ((uint64_t) u));
> - memcpy(t->data+t->length+5, &tmp, 4);
> - t->length += 9;
> + write_u8(t, PA_TAG_S64);
> + write_u64(t, u);
> }
>
> void pa_tagstruct_put_channel_map(pa_tagstruct *t, const pa_channel_map *map) {
> @@ -227,42 +262,32 @@ void pa_tagstruct_put_channel_map(pa_tagstruct *t, const pa_channel_map *map) {
>
> pa_assert(t);
> pa_assert(map);
> - extend(t, 2 + (size_t) map->channels);
>
> - t->data[t->length++] = PA_TAG_CHANNEL_MAP;
> - t->data[t->length++] = map->channels;
> + write_u8(t, PA_TAG_CHANNEL_MAP);
> + write_u8(t, map->channels);
>
> for (i = 0; i < map->channels; i ++)
> - t->data[t->length++] = (uint8_t) map->map[i];
> + write_u8(t, map->map[i]);
> }
>
> void pa_tagstruct_put_cvolume(pa_tagstruct *t, const pa_cvolume *cvolume) {
> unsigned i;
> - pa_volume_t vol;
>
> pa_assert(t);
> pa_assert(cvolume);
> - extend(t, 2 + cvolume->channels * sizeof(pa_volume_t));
>
> - t->data[t->length++] = PA_TAG_CVOLUME;
> - t->data[t->length++] = cvolume->channels;
> + write_u8(t, PA_TAG_CVOLUME);
> + write_u8(t, cvolume->channels);
>
> - for (i = 0; i < cvolume->channels; i ++) {
> - vol = htonl(cvolume->values[i]);
> - memcpy(t->data + t->length, &vol, sizeof(pa_volume_t));
> - t->length += sizeof(pa_volume_t);
> - }
> + for (i = 0; i < cvolume->channels; i ++)
> + write_u32(t, cvolume->values[i]);
> }
>
> void pa_tagstruct_put_volume(pa_tagstruct *t, pa_volume_t vol) {
> - uint32_t u;
> pa_assert(t);
>
> - extend(t, 5);
> - t->data[t->length] = PA_TAG_VOLUME;
> - u = htonl((uint32_t) vol);
> - memcpy(t->data+t->length+1, &u, 4);
> - t->length += 5;
> + write_u8(t, PA_TAG_VOLUME);
> + write_u32(t, vol);
> }
>
> void pa_tagstruct_put_proplist(pa_tagstruct *t, pa_proplist *p) {
> @@ -270,9 +295,7 @@ void pa_tagstruct_put_proplist(pa_tagstruct *t, pa_proplist *p) {
> pa_assert(t);
> pa_assert(p);
>
> - extend(t, 1);
> -
> - t->data[t->length++] = PA_TAG_PROPLIST;
> + write_u8(t, PA_TAG_PROPLIST);
>
> for (;;) {
> const char *k;
> @@ -295,13 +318,23 @@ void pa_tagstruct_put_format_info(pa_tagstruct *t, pa_format_info *f) {
> pa_assert(t);
> pa_assert(f);
>
> - extend(t, 1);
> -
> - t->data[t->length++] = PA_TAG_FORMAT_INFO;
> + write_u8(t, PA_TAG_FORMAT_INFO);
> pa_tagstruct_putu8(t, (uint8_t) f->encoding);
> pa_tagstruct_put_proplist(t, f->plist);
> }
>
> +static int read_tag(pa_tagstruct *t, uint8_t type) {
> + if (t->rindex + 1 > t->length)
> + return -1;
> +
> + if (t->data[t->rindex] != type)
> + return -1;
> +
> + t->rindex++;
> +
> + return 0;
> +}
> +
> int pa_tagstruct_gets(pa_tagstruct*t, const char **s) {
> int error = 0;
> size_t n;
> @@ -319,14 +352,14 @@ int pa_tagstruct_gets(pa_tagstruct*t, const char **s) {
> return 0;
> }
>
> - if (t->rindex+2 > t->length)
> + if (read_tag(t, PA_TAG_STRING) < 0)
> return -1;
>
> - if (t->data[t->rindex] != PA_TAG_STRING)
> + if (t->rindex + 1 > t->length)
> return -1;
>
> error = 1;
> - for (n = 0, c = (char*) (t->data+t->rindex+1); t->rindex+1+n < t->length; n++, c++)
> + for (n = 0, c = (char*) (t->data + t->rindex); t->rindex + n < t->length; n++, c++)
> if (!*c) {
> error = 0;
> break;
> @@ -335,9 +368,9 @@ int pa_tagstruct_gets(pa_tagstruct*t, const char **s) {
> if (error)
> return -1;
>
> - *s = (char*) (t->data+t->rindex+1);
> + *s = (char*) (t->data + t->rindex);
>
> - t->rindex += n+2;
> + t->rindex += n + 1;
> return 0;
> }
>
> @@ -345,50 +378,40 @@ int pa_tagstruct_getu32(pa_tagstruct*t, uint32_t *i) {
> pa_assert(t);
> pa_assert(i);
>
> - if (t->rindex+5 > t->length)
> - return -1;
> -
> - if (t->data[t->rindex] != PA_TAG_U32)
> + if (read_tag(t, PA_TAG_U32) < 0)
> return -1;
>
> - memcpy(i, t->data+t->rindex+1, 4);
> - *i = ntohl(*i);
> - t->rindex += 5;
> - return 0;
> + return read_u32(t, i);
> }
>
> int pa_tagstruct_getu8(pa_tagstruct*t, uint8_t *c) {
> pa_assert(t);
> pa_assert(c);
>
> - if (t->rindex+2 > t->length)
> + if (read_tag(t, PA_TAG_U8) < 0)
> return -1;
>
> - if (t->data[t->rindex] != PA_TAG_U8)
> - return -1;
> -
> - *c = t->data[t->rindex+1];
> - t->rindex +=2;
> - return 0;
> + return read_u8(t, c);
> }
>
> int pa_tagstruct_get_sample_spec(pa_tagstruct *t, pa_sample_spec *ss) {
> + uint8_t tmp;
> +
> pa_assert(t);
> pa_assert(ss);
>
> - if (t->rindex+7 > t->length)
> + if (read_tag(t, PA_TAG_SAMPLE_SPEC) < 0)
> return -1;
>
> - if (t->data[t->rindex] != PA_TAG_SAMPLE_SPEC)
> + if (read_u8(t, &tmp) < 0)
> return -1;
>
> - ss->format = t->data[t->rindex+1];
> - ss->channels = t->data[t->rindex+2];
> - memcpy(&ss->rate, t->data+t->rindex+3, 4);
> - ss->rate = ntohl(ss->rate);
> + ss->format = tmp;
>
> - t->rindex += 7;
> - return 0;
> + if (read_u8(t, &ss->channels) < 0)
> + return -1;
> +
> + return read_u32(t, &ss->rate);
> }
>
> int pa_tagstruct_get_arbitrary(pa_tagstruct *t, const void **p, size_t length) {
> @@ -397,19 +420,13 @@ int pa_tagstruct_get_arbitrary(pa_tagstruct *t, const void **p, size_t length) {
> pa_assert(t);
> pa_assert(p);
>
> - if (t->rindex+5+length > t->length)
> - return -1;
> -
> - if (t->data[t->rindex] != PA_TAG_ARBITRARY)
> + if (read_tag(t, PA_TAG_ARBITRARY) < 0)
> return -1;
>
> - memcpy(&len, t->data+t->rindex+1, 4);
> - if (ntohl(len) != length)
> + if (read_u32(t, &len) < 0 || len != length)
> return -1;
>
> - *p = t->data+t->rindex+5;
> - t->rindex += 5+length;
> - return 0;
> + return read_arbitrary(t, p, length);
> }
>
> int pa_tagstruct_eof(pa_tagstruct*t) {
> @@ -446,82 +463,55 @@ int pa_tagstruct_get_boolean(pa_tagstruct*t, bool *b) {
> }
>
> int pa_tagstruct_get_timeval(pa_tagstruct*t, struct timeval *tv) {
> + uint32_t tmp;
>
> pa_assert(t);
> pa_assert(tv);
>
> - if (t->rindex+9 > t->length)
> + if (read_tag(t, PA_TAG_TIMEVAL) < 0)
> return -1;
>
> - if (t->data[t->rindex] != PA_TAG_TIMEVAL)
> + if (read_u32(t, &tmp) < 0)
> return -1;
>
> - memcpy(&tv->tv_sec, t->data+t->rindex+1, 4);
> - tv->tv_sec = (time_t) ntohl((uint32_t) tv->tv_sec);
> - memcpy(&tv->tv_usec, t->data+t->rindex+5, 4);
> - tv->tv_usec = (suseconds_t) ntohl((uint32_t) tv->tv_usec);
> - t->rindex += 9;
> + tv->tv_sec = tmp;
> +
> + if (read_u32(t, &tmp) < 0)
> + return -1;
> +
> + tv->tv_usec = tmp;
> +
> return 0;
> }
>
> int pa_tagstruct_get_usec(pa_tagstruct*t, pa_usec_t *u) {
> - uint32_t tmp;
> -
> pa_assert(t);
> pa_assert(u);
>
> - if (t->rindex+9 > t->length)
> + if (read_tag(t, PA_TAG_USEC) < 0)
> return -1;
>
> - if (t->data[t->rindex] != PA_TAG_USEC)
> - return -1;
> -
> - memcpy(&tmp, t->data+t->rindex+1, 4);
> - *u = (pa_usec_t) ntohl(tmp) << 32;
> - memcpy(&tmp, t->data+t->rindex+5, 4);
> - *u |= (pa_usec_t) ntohl(tmp);
> - t->rindex +=9;
> - return 0;
> + return read_u64(t, u);
> }
>
> int pa_tagstruct_getu64(pa_tagstruct*t, uint64_t *u) {
> - uint32_t tmp;
> -
> pa_assert(t);
> pa_assert(u);
>
> - if (t->rindex+9 > t->length)
> - return -1;
> -
> - if (t->data[t->rindex] != PA_TAG_U64)
> + if (read_tag(t, PA_TAG_U64) < 0)
> return -1;
>
> - memcpy(&tmp, t->data+t->rindex+1, 4);
> - *u = (uint64_t) ntohl(tmp) << 32;
> - memcpy(&tmp, t->data+t->rindex+5, 4);
> - *u |= (uint64_t) ntohl(tmp);
> - t->rindex +=9;
> - return 0;
> + return read_u64(t, u);
> }
>
> int pa_tagstruct_gets64(pa_tagstruct*t, int64_t *u) {
> - uint32_t tmp;
> -
> pa_assert(t);
> pa_assert(u);
>
> - if (t->rindex+9 > t->length)
> + if (read_tag(t, PA_TAG_S64) < 0)
> return -1;
>
> - if (t->data[t->rindex] != PA_TAG_S64)
> - return -1;
> -
> - memcpy(&tmp, t->data+t->rindex+1, 4);
> - *u = (int64_t) ((uint64_t) ntohl(tmp) << 32);
> - memcpy(&tmp, t->data+t->rindex+5, 4);
> - *u |= (int64_t) ntohl(tmp);
> - t->rindex +=9;
> - return 0;
> + return read_s64(t, u);
> }
>
> int pa_tagstruct_get_channel_map(pa_tagstruct *t, pa_channel_map *map) {
> @@ -530,149 +520,105 @@ int pa_tagstruct_get_channel_map(pa_tagstruct *t, pa_channel_map *map) {
> pa_assert(t);
> pa_assert(map);
>
> - if (t->rindex+2 > t->length)
> + if (read_tag(t, PA_TAG_CHANNEL_MAP) < 0)
> return -1;
>
> - if (t->data[t->rindex] != PA_TAG_CHANNEL_MAP)
> + if (read_u8(t, &map->channels) < 0 || map->channels > PA_CHANNELS_MAX)
> return -1;
>
> - if ((map->channels = t->data[t->rindex+1]) > PA_CHANNELS_MAX)
> - return -1;
> + for (i = 0; i < map->channels; i ++) {
> + uint8_t tmp;
>
> - if (t->rindex+2+map->channels > t->length)
> - return -1;
> + if (read_u8(t, &tmp) < 0)
> + return -1;
>
> - for (i = 0; i < map->channels; i ++)
> - map->map[i] = (int8_t) t->data[t->rindex + 2 + i];
> + map->map[i] = tmp;
> + }
>
> - t->rindex += 2 + (size_t) map->channels;
> return 0;
> }
>
> int pa_tagstruct_get_cvolume(pa_tagstruct *t, pa_cvolume *cvolume) {
> unsigned i;
> - pa_volume_t vol;
>
> pa_assert(t);
> pa_assert(cvolume);
>
> - if (t->rindex+2 > t->length)
> + if (read_tag(t, PA_TAG_CVOLUME) < 0)
> return -1;
>
> - if (t->data[t->rindex] != PA_TAG_CVOLUME)
> - return -1;
> -
> - if ((cvolume->channels = t->data[t->rindex+1]) > PA_CHANNELS_MAX)
> - return -1;
> -
> - if (t->rindex+2+cvolume->channels*sizeof(pa_volume_t) > t->length)
> + if (read_u8(t, &cvolume->channels) < 0 || cvolume->channels > PA_CHANNELS_MAX)
> return -1;
>
> for (i = 0; i < cvolume->channels; i ++) {
> - memcpy(&vol, t->data + t->rindex + 2 + i * sizeof(pa_volume_t), sizeof(pa_volume_t));
> - cvolume->values[i] = (pa_volume_t) ntohl(vol);
> + if (read_u32(t, &cvolume->values[i]) < 0)
> + return -1;
> }
>
> - t->rindex += 2 + cvolume->channels * sizeof(pa_volume_t);
> return 0;
> }
>
> int pa_tagstruct_get_volume(pa_tagstruct*t, pa_volume_t *vol) {
> - uint32_t u;
> -
> pa_assert(t);
> pa_assert(vol);
>
> - if (t->rindex+5 > t->length)
> - return -1;
> -
> - if (t->data[t->rindex] != PA_TAG_VOLUME)
> + if (read_tag(t, PA_TAG_VOLUME) < 0)
> return -1;
>
> - memcpy(&u, t->data+t->rindex+1, 4);
> - *vol = (pa_volume_t) ntohl(u);
> -
> - t->rindex += 5;
> - return 0;
> + return read_u32(t, vol);
> }
>
> int pa_tagstruct_get_proplist(pa_tagstruct *t, pa_proplist *p) {
> - size_t saved_rindex;
> -
> pa_assert(t);
>
> - if (t->rindex+1 > t->length)
> - return -1;
> -
> - if (t->data[t->rindex] != PA_TAG_PROPLIST)
> + if (read_tag(t, PA_TAG_PROPLIST) < 0)
> return -1;
>
> - saved_rindex = t->rindex;
> - t->rindex++;
> -
> for (;;) {
> const char *k;
> const void *d;
> uint32_t length;
>
> if (pa_tagstruct_gets(t, &k) < 0)
> - goto fail;
> + return -1;
>
> if (!k)
> break;
>
> if (!pa_proplist_key_valid(k))
> - goto fail;
> + return -1;
>
> if (pa_tagstruct_getu32(t, &length) < 0)
> - goto fail;
> + return -1;
>
> if (length > MAX_TAG_SIZE)
> - goto fail;
> + return -1;
>
> if (pa_tagstruct_get_arbitrary(t, &d, length) < 0)
> - goto fail;
> + return -1;
>
> if (p)
> pa_assert_se(pa_proplist_set(p, k, d, length) >= 0);
> }
>
> return 0;
> -
> -fail:
> - t->rindex = saved_rindex;
> - return -1;
> }
>
> int pa_tagstruct_get_format_info(pa_tagstruct *t, pa_format_info *f) {
> - size_t saved_rindex;
> uint8_t encoding;
>
> pa_assert(t);
> pa_assert(f);
>
> - if (t->rindex+1 > t->length)
> + if (read_tag(t, PA_TAG_FORMAT_INFO) < 0)
> return -1;
>
> - if (t->data[t->rindex] != PA_TAG_FORMAT_INFO)
> - return -1;
> -
> - saved_rindex = t->rindex;
> - t->rindex++;
> -
> if (pa_tagstruct_getu8(t, &encoding) < 0)
> - goto fail;
> + return -1;
>
> f->encoding = encoding;
>
> - if (pa_tagstruct_get_proplist(t, f->plist) < 0)
> - goto fail;
> -
> - return 0;
> -
> -fail:
> - t->rindex = saved_rindex;
> - return -1;
> + return pa_tagstruct_get_proplist(t, f->plist);
> }
>
> void pa_tagstruct_put(pa_tagstruct *t, ...) {
>
--
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic
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