| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| //#define LOG_NDEBUG 0 |
| #define LOG_TAG "ID3" |
| #include <utils/Log.h> |
| |
| #include "../include/ID3.h" |
| |
| #include <media/stagefright/foundation/ADebug.h> |
| #include <media/stagefright/DataSource.h> |
| #include <media/stagefright/Utils.h> |
| #include <utils/String8.h> |
| #include <byteswap.h> |
| |
| namespace android { |
| |
| static const size_t kMaxMetadataSize = 3 * 1024 * 1024; |
| |
| struct MemorySource : public DataSource { |
| MemorySource(const uint8_t *data, size_t size) |
| : mData(data), |
| mSize(size) { |
| } |
| |
| virtual status_t initCheck() const { |
| return OK; |
| } |
| |
| virtual ssize_t readAt(off64_t offset, void *data, size_t size) { |
| off64_t available = (offset >= (off64_t)mSize) ? 0ll : mSize - offset; |
| |
| size_t copy = (available > (off64_t)size) ? size : available; |
| memcpy(data, mData + offset, copy); |
| |
| return copy; |
| } |
| |
| private: |
| const uint8_t *mData; |
| size_t mSize; |
| |
| DISALLOW_EVIL_CONSTRUCTORS(MemorySource); |
| }; |
| |
| ID3::ID3(const sp<DataSource> &source, bool ignoreV1, off64_t offset) |
| : mIsValid(false), |
| mData(NULL), |
| mSize(0), |
| mFirstFrameOffset(0), |
| mVersion(ID3_UNKNOWN), |
| mRawSize(0) { |
| mIsValid = parseV2(source, offset); |
| |
| if (!mIsValid && !ignoreV1) { |
| mIsValid = parseV1(source); |
| } |
| } |
| |
| ID3::ID3(const uint8_t *data, size_t size, bool ignoreV1) |
| : mIsValid(false), |
| mData(NULL), |
| mSize(0), |
| mFirstFrameOffset(0), |
| mVersion(ID3_UNKNOWN), |
| mRawSize(0) { |
| sp<MemorySource> source = new MemorySource(data, size); |
| |
| mIsValid = parseV2(source, 0); |
| |
| if (!mIsValid && !ignoreV1) { |
| mIsValid = parseV1(source); |
| } |
| } |
| |
| ID3::~ID3() { |
| if (mData) { |
| free(mData); |
| mData = NULL; |
| } |
| } |
| |
| bool ID3::isValid() const { |
| return mIsValid; |
| } |
| |
| ID3::Version ID3::version() const { |
| return mVersion; |
| } |
| |
| // static |
| bool ID3::ParseSyncsafeInteger(const uint8_t encoded[4], size_t *x) { |
| *x = 0; |
| for (int32_t i = 0; i < 4; ++i) { |
| if (encoded[i] & 0x80) { |
| return false; |
| } |
| |
| *x = ((*x) << 7) | encoded[i]; |
| } |
| |
| return true; |
| } |
| |
| bool ID3::parseV2(const sp<DataSource> &source, off64_t offset) { |
| struct id3_header { |
| char id[3]; |
| uint8_t version_major; |
| uint8_t version_minor; |
| uint8_t flags; |
| uint8_t enc_size[4]; |
| }; |
| |
| id3_header header; |
| if (source->readAt( |
| offset, &header, sizeof(header)) != (ssize_t)sizeof(header)) { |
| return false; |
| } |
| |
| if (memcmp(header.id, "ID3", 3)) { |
| return false; |
| } |
| |
| if (header.version_major == 0xff || header.version_minor == 0xff) { |
| return false; |
| } |
| |
| if (header.version_major == 2) { |
| if (header.flags & 0x3f) { |
| // We only support the 2 high bits, if any of the lower bits are |
| // set, we cannot guarantee to understand the tag format. |
| return false; |
| } |
| |
| if (header.flags & 0x40) { |
| // No compression scheme has been decided yet, ignore the |
| // tag if compression is indicated. |
| |
| return false; |
| } |
| } else if (header.version_major == 3) { |
| if (header.flags & 0x1f) { |
| // We only support the 3 high bits, if any of the lower bits are |
| // set, we cannot guarantee to understand the tag format. |
| return false; |
| } |
| } else if (header.version_major == 4) { |
| if (header.flags & 0x0f) { |
| // The lower 4 bits are undefined in this spec. |
| return false; |
| } |
| } else { |
| return false; |
| } |
| |
| size_t size; |
| if (!ParseSyncsafeInteger(header.enc_size, &size)) { |
| return false; |
| } |
| |
| if (size > kMaxMetadataSize) { |
| ALOGE("skipping huge ID3 metadata of size %zu", size); |
| return false; |
| } |
| |
| mData = (uint8_t *)malloc(size); |
| |
| if (mData == NULL) { |
| return false; |
| } |
| |
| mSize = size; |
| mRawSize = mSize + sizeof(header); |
| |
| if (source->readAt(offset + sizeof(header), mData, mSize) != (ssize_t)mSize) { |
| free(mData); |
| mData = NULL; |
| |
| return false; |
| } |
| |
| if (header.version_major == 4) { |
| void *copy = malloc(size); |
| memcpy(copy, mData, size); |
| |
| bool success = removeUnsynchronizationV2_4(false /* iTunesHack */); |
| if (!success) { |
| memcpy(mData, copy, size); |
| mSize = size; |
| |
| success = removeUnsynchronizationV2_4(true /* iTunesHack */); |
| |
| if (success) { |
| ALOGV("Had to apply the iTunes hack to parse this ID3 tag"); |
| } |
| } |
| |
| free(copy); |
| copy = NULL; |
| |
| if (!success) { |
| free(mData); |
| mData = NULL; |
| |
| return false; |
| } |
| } else if (header.flags & 0x80) { |
| ALOGV("removing unsynchronization"); |
| |
| removeUnsynchronization(); |
| } |
| |
| mFirstFrameOffset = 0; |
| if (header.version_major == 3 && (header.flags & 0x40)) { |
| // Version 2.3 has an optional extended header. |
| |
| if (mSize < 4) { |
| free(mData); |
| mData = NULL; |
| |
| return false; |
| } |
| |
| size_t extendedHeaderSize = U32_AT(&mData[0]) + 4; |
| |
| if (extendedHeaderSize > mSize) { |
| free(mData); |
| mData = NULL; |
| |
| return false; |
| } |
| |
| mFirstFrameOffset = extendedHeaderSize; |
| |
| uint16_t extendedFlags = 0; |
| if (extendedHeaderSize >= 6) { |
| extendedFlags = U16_AT(&mData[4]); |
| |
| if (extendedHeaderSize >= 10) { |
| size_t paddingSize = U32_AT(&mData[6]); |
| |
| if (mFirstFrameOffset + paddingSize > mSize) { |
| free(mData); |
| mData = NULL; |
| |
| return false; |
| } |
| |
| mSize -= paddingSize; |
| } |
| |
| if (extendedFlags & 0x8000) { |
| ALOGV("have crc"); |
| } |
| } |
| } else if (header.version_major == 4 && (header.flags & 0x40)) { |
| // Version 2.4 has an optional extended header, that's different |
| // from Version 2.3's... |
| |
| if (mSize < 4) { |
| free(mData); |
| mData = NULL; |
| |
| return false; |
| } |
| |
| size_t ext_size; |
| if (!ParseSyncsafeInteger(mData, &ext_size)) { |
| free(mData); |
| mData = NULL; |
| |
| return false; |
| } |
| |
| if (ext_size < 6 || ext_size > mSize) { |
| free(mData); |
| mData = NULL; |
| |
| return false; |
| } |
| |
| mFirstFrameOffset = ext_size; |
| } |
| |
| if (header.version_major == 2) { |
| mVersion = ID3_V2_2; |
| } else if (header.version_major == 3) { |
| mVersion = ID3_V2_3; |
| } else { |
| CHECK_EQ(header.version_major, 4); |
| mVersion = ID3_V2_4; |
| } |
| |
| return true; |
| } |
| |
| void ID3::removeUnsynchronization() { |
| for (size_t i = 0; i + 1 < mSize; ++i) { |
| if (mData[i] == 0xff && mData[i + 1] == 0x00) { |
| memmove(&mData[i + 1], &mData[i + 2], mSize - i - 2); |
| --mSize; |
| } |
| } |
| } |
| |
| static void WriteSyncsafeInteger(uint8_t *dst, size_t x) { |
| for (size_t i = 0; i < 4; ++i) { |
| dst[3 - i] = (x & 0x7f); |
| x >>= 7; |
| } |
| } |
| |
| bool ID3::removeUnsynchronizationV2_4(bool iTunesHack) { |
| size_t oldSize = mSize; |
| |
| size_t offset = 0; |
| while (offset + 10 <= mSize) { |
| if (!memcmp(&mData[offset], "\0\0\0\0", 4)) { |
| break; |
| } |
| |
| size_t dataSize; |
| if (iTunesHack) { |
| dataSize = U32_AT(&mData[offset + 4]); |
| } else if (!ParseSyncsafeInteger(&mData[offset + 4], &dataSize)) { |
| return false; |
| } |
| |
| if (offset + dataSize + 10 > mSize) { |
| return false; |
| } |
| |
| uint16_t flags = U16_AT(&mData[offset + 8]); |
| uint16_t prevFlags = flags; |
| |
| if (flags & 1) { |
| // Strip data length indicator |
| |
| memmove(&mData[offset + 10], &mData[offset + 14], mSize - offset - 14); |
| mSize -= 4; |
| dataSize -= 4; |
| |
| flags &= ~1; |
| } |
| |
| if (flags & 2) { |
| // This file has "unsynchronization", so we have to replace occurrences |
| // of 0xff 0x00 with just 0xff in order to get the real data. |
| |
| size_t readOffset = offset + 11; |
| size_t writeOffset = offset + 11; |
| for (size_t i = 0; i + 1 < dataSize; ++i) { |
| if (mData[readOffset - 1] == 0xff |
| && mData[readOffset] == 0x00) { |
| ++readOffset; |
| --mSize; |
| --dataSize; |
| } |
| mData[writeOffset++] = mData[readOffset++]; |
| } |
| // move the remaining data following this frame |
| memmove(&mData[writeOffset], &mData[readOffset], oldSize - readOffset); |
| |
| flags &= ~2; |
| } |
| |
| if (flags != prevFlags || iTunesHack) { |
| WriteSyncsafeInteger(&mData[offset + 4], dataSize); |
| mData[offset + 8] = flags >> 8; |
| mData[offset + 9] = flags & 0xff; |
| } |
| |
| offset += 10 + dataSize; |
| } |
| |
| memset(&mData[mSize], 0, oldSize - mSize); |
| |
| return true; |
| } |
| |
| ID3::Iterator::Iterator(const ID3 &parent, const char *id) |
| : mParent(parent), |
| mID(NULL), |
| mOffset(mParent.mFirstFrameOffset), |
| mFrameData(NULL), |
| mFrameSize(0) { |
| if (id) { |
| mID = strdup(id); |
| } |
| |
| findFrame(); |
| } |
| |
| ID3::Iterator::~Iterator() { |
| if (mID) { |
| free(mID); |
| mID = NULL; |
| } |
| } |
| |
| bool ID3::Iterator::done() const { |
| return mFrameData == NULL; |
| } |
| |
| void ID3::Iterator::next() { |
| if (mFrameData == NULL) { |
| return; |
| } |
| |
| mOffset += mFrameSize; |
| |
| findFrame(); |
| } |
| |
| void ID3::Iterator::getID(String8 *id) const { |
| id->setTo(""); |
| |
| if (mFrameData == NULL) { |
| return; |
| } |
| |
| if (mParent.mVersion == ID3_V2_2) { |
| id->setTo((const char *)&mParent.mData[mOffset], 3); |
| } else if (mParent.mVersion == ID3_V2_3 || mParent.mVersion == ID3_V2_4) { |
| id->setTo((const char *)&mParent.mData[mOffset], 4); |
| } else { |
| CHECK(mParent.mVersion == ID3_V1 || mParent.mVersion == ID3_V1_1); |
| |
| switch (mOffset) { |
| case 3: |
| id->setTo("TT2"); |
| break; |
| case 33: |
| id->setTo("TP1"); |
| break; |
| case 63: |
| id->setTo("TAL"); |
| break; |
| case 93: |
| id->setTo("TYE"); |
| break; |
| case 97: |
| id->setTo("COM"); |
| break; |
| case 126: |
| id->setTo("TRK"); |
| break; |
| case 127: |
| id->setTo("TCO"); |
| break; |
| default: |
| CHECK(!"should not be here."); |
| break; |
| } |
| } |
| } |
| |
| |
| // the 2nd argument is used to get the data following the \0 in a comment field |
| void ID3::Iterator::getString(String8 *id, String8 *comment) const { |
| getstring(id, false); |
| if (comment != NULL) { |
| getstring(comment, true); |
| } |
| } |
| |
| // comment fields (COM/COMM) contain an initial short descriptor, followed by \0, |
| // followed by more data. The data following the \0 can be retrieved by setting |
| // "otherdata" to true. |
| void ID3::Iterator::getstring(String8 *id, bool otherdata) const { |
| id->setTo(""); |
| |
| const uint8_t *frameData = mFrameData; |
| if (frameData == NULL) { |
| return; |
| } |
| |
| uint8_t encoding = *frameData; |
| |
| if (mParent.mVersion == ID3_V1 || mParent.mVersion == ID3_V1_1) { |
| if (mOffset == 126 || mOffset == 127) { |
| // Special treatment for the track number and genre. |
| char tmp[16]; |
| sprintf(tmp, "%d", (int)*frameData); |
| |
| id->setTo(tmp); |
| return; |
| } |
| |
| // this is supposed to be ISO-8859-1, but pass it up as-is to the caller, who will figure |
| // out the real encoding |
| id->setTo((const char*)frameData, mFrameSize); |
| return; |
| } |
| |
| size_t n = mFrameSize - getHeaderLength() - 1; |
| if (otherdata) { |
| // skip past the encoding, language, and the 0 separator |
| frameData += 4; |
| int32_t i = n - 4; |
| while(--i >= 0 && *++frameData != 0) ; |
| int skipped = (frameData - mFrameData); |
| if (skipped >= (int)n) { |
| return; |
| } |
| n -= skipped; |
| } |
| |
| if (encoding == 0x00) { |
| // supposedly ISO 8859-1 |
| id->setTo((const char*)frameData + 1, n); |
| } else if (encoding == 0x03) { |
| // supposedly UTF-8 |
| id->setTo((const char *)(frameData + 1), n); |
| } else if (encoding == 0x02) { |
| // supposedly UTF-16 BE, no byte order mark. |
| // API wants number of characters, not number of bytes... |
| int len = n / 2; |
| const char16_t *framedata = (const char16_t *) (frameData + 1); |
| char16_t *framedatacopy = NULL; |
| #if BYTE_ORDER == LITTLE_ENDIAN |
| framedatacopy = new char16_t[len]; |
| for (int i = 0; i < len; i++) { |
| framedatacopy[i] = bswap_16(framedata[i]); |
| } |
| framedata = framedatacopy; |
| #endif |
| id->setTo(framedata, len); |
| if (framedatacopy != NULL) { |
| delete[] framedatacopy; |
| } |
| } else if (encoding == 0x01) { |
| // UCS-2 |
| // API wants number of characters, not number of bytes... |
| int len = n / 2; |
| const char16_t *framedata = (const char16_t *) (frameData + 1); |
| char16_t *framedatacopy = NULL; |
| if (*framedata == 0xfffe) { |
| // endianness marker doesn't match host endianness, convert |
| framedatacopy = new char16_t[len]; |
| for (int i = 0; i < len; i++) { |
| framedatacopy[i] = bswap_16(framedata[i]); |
| } |
| framedata = framedatacopy; |
| } |
| // If the string starts with an endianness marker, skip it |
| if (*framedata == 0xfeff) { |
| framedata++; |
| len--; |
| } |
| |
| // check if the resulting data consists entirely of 8-bit values |
| bool eightBit = true; |
| for (int i = 0; i < len; i++) { |
| if (framedata[i] > 0xff) { |
| eightBit = false; |
| break; |
| } |
| } |
| if (eightBit) { |
| // collapse to 8 bit, then let the media scanner client figure out the real encoding |
| char *frame8 = new char[len]; |
| for (int i = 0; i < len; i++) { |
| frame8[i] = framedata[i]; |
| } |
| id->setTo(frame8, len); |
| delete [] frame8; |
| } else { |
| id->setTo(framedata, len); |
| } |
| |
| if (framedatacopy != NULL) { |
| delete[] framedatacopy; |
| } |
| } |
| } |
| |
| const uint8_t *ID3::Iterator::getData(size_t *length) const { |
| *length = 0; |
| |
| if (mFrameData == NULL) { |
| return NULL; |
| } |
| |
| *length = mFrameSize - getHeaderLength(); |
| |
| return mFrameData; |
| } |
| |
| size_t ID3::Iterator::getHeaderLength() const { |
| if (mParent.mVersion == ID3_V2_2) { |
| return 6; |
| } else if (mParent.mVersion == ID3_V2_3 || mParent.mVersion == ID3_V2_4) { |
| return 10; |
| } else { |
| CHECK(mParent.mVersion == ID3_V1 || mParent.mVersion == ID3_V1_1); |
| return 0; |
| } |
| } |
| |
| void ID3::Iterator::findFrame() { |
| for (;;) { |
| mFrameData = NULL; |
| mFrameSize = 0; |
| |
| if (mParent.mVersion == ID3_V2_2) { |
| if (mOffset + 6 > mParent.mSize) { |
| return; |
| } |
| |
| if (!memcmp(&mParent.mData[mOffset], "\0\0\0", 3)) { |
| return; |
| } |
| |
| mFrameSize = |
| (mParent.mData[mOffset + 3] << 16) |
| | (mParent.mData[mOffset + 4] << 8) |
| | mParent.mData[mOffset + 5]; |
| |
| mFrameSize += 6; |
| |
| if (mOffset + mFrameSize > mParent.mSize) { |
| ALOGV("partial frame at offset %zu (size = %zu, bytes-remaining = %zu)", |
| mOffset, mFrameSize, mParent.mSize - mOffset - (size_t)6); |
| return; |
| } |
| |
| mFrameData = &mParent.mData[mOffset + 6]; |
| |
| if (!mID) { |
| break; |
| } |
| |
| char id[4]; |
| memcpy(id, &mParent.mData[mOffset], 3); |
| id[3] = '\0'; |
| |
| if (!strcmp(id, mID)) { |
| break; |
| } |
| } else if (mParent.mVersion == ID3_V2_3 |
| || mParent.mVersion == ID3_V2_4) { |
| if (mOffset + 10 > mParent.mSize) { |
| return; |
| } |
| |
| if (!memcmp(&mParent.mData[mOffset], "\0\0\0\0", 4)) { |
| return; |
| } |
| |
| size_t baseSize; |
| if (mParent.mVersion == ID3_V2_4) { |
| if (!ParseSyncsafeInteger( |
| &mParent.mData[mOffset + 4], &baseSize)) { |
| return; |
| } |
| } else { |
| baseSize = U32_AT(&mParent.mData[mOffset + 4]); |
| } |
| |
| mFrameSize = 10 + baseSize; |
| |
| if (mOffset + mFrameSize > mParent.mSize) { |
| ALOGV("partial frame at offset %zu (size = %zu, bytes-remaining = %zu)", |
| mOffset, mFrameSize, mParent.mSize - mOffset - (size_t)10); |
| return; |
| } |
| |
| uint16_t flags = U16_AT(&mParent.mData[mOffset + 8]); |
| |
| if ((mParent.mVersion == ID3_V2_4 && (flags & 0x000c)) |
| || (mParent.mVersion == ID3_V2_3 && (flags & 0x00c0))) { |
| // Compression or encryption are not supported at this time. |
| // Per-frame unsynchronization and data-length indicator |
| // have already been taken care of. |
| |
| ALOGV("Skipping unsupported frame (compression, encryption " |
| "or per-frame unsynchronization flagged"); |
| |
| mOffset += mFrameSize; |
| continue; |
| } |
| |
| mFrameData = &mParent.mData[mOffset + 10]; |
| |
| if (!mID) { |
| break; |
| } |
| |
| char id[5]; |
| memcpy(id, &mParent.mData[mOffset], 4); |
| id[4] = '\0'; |
| |
| if (!strcmp(id, mID)) { |
| break; |
| } |
| } else { |
| CHECK(mParent.mVersion == ID3_V1 || mParent.mVersion == ID3_V1_1); |
| |
| if (mOffset >= mParent.mSize) { |
| return; |
| } |
| |
| mFrameData = &mParent.mData[mOffset]; |
| |
| switch (mOffset) { |
| case 3: |
| case 33: |
| case 63: |
| mFrameSize = 30; |
| break; |
| case 93: |
| mFrameSize = 4; |
| break; |
| case 97: |
| if (mParent.mVersion == ID3_V1) { |
| mFrameSize = 30; |
| } else { |
| mFrameSize = 29; |
| } |
| break; |
| case 126: |
| mFrameSize = 1; |
| break; |
| case 127: |
| mFrameSize = 1; |
| break; |
| default: |
| CHECK(!"Should not be here, invalid offset."); |
| break; |
| } |
| |
| if (!mID) { |
| break; |
| } |
| |
| String8 id; |
| getID(&id); |
| |
| if (id == mID) { |
| break; |
| } |
| } |
| |
| mOffset += mFrameSize; |
| } |
| } |
| |
| static size_t StringSize(const uint8_t *start, uint8_t encoding) { |
| if (encoding == 0x00 || encoding == 0x03) { |
| // ISO 8859-1 or UTF-8 |
| return strlen((const char *)start) + 1; |
| } |
| |
| // UCS-2 |
| size_t n = 0; |
| while (start[n] != '\0' || start[n + 1] != '\0') { |
| n += 2; |
| } |
| |
| // Add size of null termination. |
| return n + 2; |
| } |
| |
| const void * |
| ID3::getAlbumArt(size_t *length, String8 *mime) const { |
| *length = 0; |
| mime->setTo(""); |
| |
| Iterator it( |
| *this, |
| (mVersion == ID3_V2_3 || mVersion == ID3_V2_4) ? "APIC" : "PIC"); |
| |
| while (!it.done()) { |
| size_t size; |
| const uint8_t *data = it.getData(&size); |
| |
| if (mVersion == ID3_V2_3 || mVersion == ID3_V2_4) { |
| uint8_t encoding = data[0]; |
| mime->setTo((const char *)&data[1]); |
| size_t mimeLen = strlen((const char *)&data[1]) + 1; |
| |
| uint8_t picType = data[1 + mimeLen]; |
| #if 0 |
| if (picType != 0x03) { |
| // Front Cover Art |
| it.next(); |
| continue; |
| } |
| #endif |
| |
| size_t descLen = StringSize(&data[2 + mimeLen], encoding); |
| |
| if (size < 2 || |
| size - 2 < mimeLen || |
| size - 2 - mimeLen < descLen) { |
| ALOGW("bogus album art sizes"); |
| return NULL; |
| } |
| *length = size - 2 - mimeLen - descLen; |
| |
| return &data[2 + mimeLen + descLen]; |
| } else { |
| uint8_t encoding = data[0]; |
| |
| if (!memcmp(&data[1], "PNG", 3)) { |
| mime->setTo("image/png"); |
| } else if (!memcmp(&data[1], "JPG", 3)) { |
| mime->setTo("image/jpeg"); |
| } else if (!memcmp(&data[1], "-->", 3)) { |
| mime->setTo("text/plain"); |
| } else { |
| return NULL; |
| } |
| |
| #if 0 |
| uint8_t picType = data[4]; |
| if (picType != 0x03) { |
| // Front Cover Art |
| it.next(); |
| continue; |
| } |
| #endif |
| |
| size_t descLen = StringSize(&data[5], encoding); |
| |
| *length = size - 5 - descLen; |
| |
| return &data[5 + descLen]; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| bool ID3::parseV1(const sp<DataSource> &source) { |
| const size_t V1_TAG_SIZE = 128; |
| |
| off64_t size; |
| if (source->getSize(&size) != OK || size < (off64_t)V1_TAG_SIZE) { |
| return false; |
| } |
| |
| mData = (uint8_t *)malloc(V1_TAG_SIZE); |
| if (source->readAt(size - V1_TAG_SIZE, mData, V1_TAG_SIZE) |
| != (ssize_t)V1_TAG_SIZE) { |
| free(mData); |
| mData = NULL; |
| |
| return false; |
| } |
| |
| if (memcmp("TAG", mData, 3)) { |
| free(mData); |
| mData = NULL; |
| |
| return false; |
| } |
| |
| mSize = V1_TAG_SIZE; |
| mFirstFrameOffset = 3; |
| |
| if (mData[V1_TAG_SIZE - 3] != 0) { |
| mVersion = ID3_V1; |
| } else { |
| mVersion = ID3_V1_1; |
| } |
| |
| return true; |
| } |
| |
| } // namespace android |