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Merge "dec/webp.c: don't wait for data before reporting w/h"

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James Zern 2013-12-18 18:47:43 -08:00 committed by Gerrit Code Review
commit c72e08119a
1 changed files with 28 additions and 16 deletions
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44
src/dec/webp.c
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@ -328,15 +328,19 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
if (has_animation != NULL) *has_animation = animation_present;
if (format != NULL) *format = 0; // default = undefined
image_width = canvas_width;
image_height = canvas_height;
if (found_vp8x && (animation_present || fragments_present) &&
headers == NULL) {
if (width != NULL) *width = canvas_width;
if (height != NULL) *height = canvas_height;
return VP8_STATUS_OK; // Just return features from VP8X header.
status = VP8_STATUS_OK;
goto ReturnWidthHeight; // Just return features from VP8X header.
}
}
if (data_size < TAG_SIZE) return VP8_STATUS_NOT_ENOUGH_DATA;
if (data_size < TAG_SIZE) {
status = VP8_STATUS_NOT_ENOUGH_DATA;
goto ReturnWidthHeight;
}
// Skip over optional chunks if data started with "RIFF + VP8X" or "ALPH".
if ((found_riff && found_vp8x) ||
@ -344,7 +348,7 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
status = ParseOptionalChunks(&data, &data_size, hdrs.riff_size,
&hdrs.alpha_data, &hdrs.alpha_data_size);
if (status != VP8_STATUS_OK) {
return status; // Found an invalid chunk size / insufficient data.
goto ReturnWidthHeight; // Invalid chunk size / insufficient data.
}
}
@ -352,7 +356,7 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
status = ParseVP8Header(&data, &data_size, hdrs.riff_size,
&hdrs.compressed_size, &hdrs.is_lossless);
if (status != VP8_STATUS_OK) {
return status; // Wrong VP8/VP8L chunk-header / insufficient data.
goto ReturnWidthHeight; // Wrong VP8/VP8L chunk-header / insufficient data.
}
if (hdrs.compressed_size > MAX_CHUNK_PAYLOAD) {
return VP8_STATUS_BITSTREAM_ERROR;
@ -364,7 +368,8 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
if (!hdrs.is_lossless) {
if (data_size < VP8_FRAME_HEADER_SIZE) {
return VP8_STATUS_NOT_ENOUGH_DATA;
status = VP8_STATUS_NOT_ENOUGH_DATA;
goto ReturnWidthHeight;
}
// Validates raw VP8 data.
if (!VP8GetInfo(data, data_size, (uint32_t)hdrs.compressed_size,
@ -373,7 +378,8 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
}
} else {
if (data_size < VP8L_FRAME_HEADER_SIZE) {
return VP8_STATUS_NOT_ENOUGH_DATA;
status = VP8_STATUS_NOT_ENOUGH_DATA;
goto ReturnWidthHeight;
}
// Validates raw VP8L data.
if (!VP8LGetInfo(data, data_size, &image_width, &image_height, has_alpha)) {
@ -386,20 +392,26 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
return VP8_STATUS_BITSTREAM_ERROR;
}
}
if (width != NULL) *width = image_width;
if (height != NULL) *height = image_height;
if (has_alpha != NULL) {
// If the data did not contain a VP8X/VP8L chunk the only definitive way
// to set this is by looking for alpha data (from an ALPH chunk).
*has_alpha |= (hdrs.alpha_data != NULL);
}
if (headers != NULL) {
*headers = hdrs;
headers->offset = data - headers->data;
assert((uint64_t)(data - headers->data) < MAX_CHUNK_PAYLOAD);
assert(headers->offset == headers->data_size - data_size);
}
return VP8_STATUS_OK; // Return features from VP8 header.
ReturnWidthHeight:
if (status == VP8_STATUS_OK ||
(status == VP8_STATUS_NOT_ENOUGH_DATA && found_vp8x && headers == NULL)) {
if (has_alpha != NULL) {
// If the data did not contain a VP8X/VP8L chunk the only definitive way
// to set this is by looking for alpha data (from an ALPH chunk).
*has_alpha |= (hdrs.alpha_data != NULL);
}
if (width != NULL) *width = image_width;
if (height != NULL) *height = image_height;
return VP8_STATUS_OK;
} else {
return status;
}
}
VP8StatusCode WebPParseHeaders(WebPHeaderStructure* const headers) {