diff options
Diffstat (limited to 'modules/libjar/zipwriter/nsZipHeader.cpp')
| -rw-r--r-- | modules/libjar/zipwriter/nsZipHeader.cpp | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/modules/libjar/zipwriter/nsZipHeader.cpp b/modules/libjar/zipwriter/nsZipHeader.cpp new file mode 100644 index 0000000000..7506670f1a --- /dev/null +++ b/modules/libjar/zipwriter/nsZipHeader.cpp @@ -0,0 +1,376 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + */ + +#include "StreamFunctions.h" +#include "nsZipHeader.h" +#include "prtime.h" + +#define ZIP_FILE_HEADER_SIGNATURE 0x04034b50 +#define ZIP_FILE_HEADER_SIZE 30 +#define ZIP_CDS_HEADER_SIGNATURE 0x02014b50 +#define ZIP_CDS_HEADER_SIZE 46 + +#define FLAGS_IS_UTF8 0x800 + +#define ZIP_EXTENDED_TIMESTAMP_FIELD 0x5455 +#define ZIP_EXTENDED_TIMESTAMP_MODTIME 0x01 + +using namespace mozilla; + +/** + * nsZipHeader represents an entry from a zip file. + */ +NS_IMPL_ISUPPORTS(nsZipHeader, nsIZipEntry) + +NS_IMETHODIMP nsZipHeader::GetCompression(uint16_t* aCompression) { + NS_ASSERTION(mInited, "Not initalised"); + + *aCompression = mMethod; + return NS_OK; +} + +NS_IMETHODIMP nsZipHeader::GetSize(uint32_t* aSize) { + NS_ASSERTION(mInited, "Not initalised"); + + *aSize = mCSize; + return NS_OK; +} + +NS_IMETHODIMP nsZipHeader::GetRealSize(uint32_t* aRealSize) { + NS_ASSERTION(mInited, "Not initalised"); + + *aRealSize = mUSize; + return NS_OK; +} + +NS_IMETHODIMP nsZipHeader::GetCRC32(uint32_t* aCRC32) { + NS_ASSERTION(mInited, "Not initalised"); + + *aCRC32 = mCRC; + return NS_OK; +} + +NS_IMETHODIMP nsZipHeader::GetIsDirectory(bool* aIsDirectory) { + NS_ASSERTION(mInited, "Not initalised"); + + if (mName.Last() == '/') + *aIsDirectory = true; + else + *aIsDirectory = false; + return NS_OK; +} + +NS_IMETHODIMP nsZipHeader::GetLastModifiedTime(PRTime* aLastModifiedTime) { + NS_ASSERTION(mInited, "Not initalised"); + + // Try to read timestamp from extra field + uint16_t blocksize; + const uint8_t* tsField = + GetExtraField(ZIP_EXTENDED_TIMESTAMP_FIELD, false, &blocksize); + if (tsField && blocksize >= 5) { + uint32_t pos = 4; + uint8_t flags; + flags = READ8(tsField, &pos); + if (flags & ZIP_EXTENDED_TIMESTAMP_MODTIME) { + *aLastModifiedTime = (PRTime)(READ32(tsField, &pos)) * PR_USEC_PER_SEC; + return NS_OK; + } + } + + // Use DOS date/time fields + // Note that on DST shift we can't handle correctly the hour that is valid + // in both DST zones + PRExplodedTime time; + + time.tm_usec = 0; + + time.tm_hour = (mTime >> 11) & 0x1F; + time.tm_min = (mTime >> 5) & 0x3F; + time.tm_sec = (mTime & 0x1F) * 2; + + time.tm_year = (mDate >> 9) + 1980; + time.tm_month = ((mDate >> 5) & 0x0F) - 1; + time.tm_mday = mDate & 0x1F; + + time.tm_params.tp_gmt_offset = 0; + time.tm_params.tp_dst_offset = 0; + + PR_NormalizeTime(&time, PR_GMTParameters); + time.tm_params.tp_gmt_offset = PR_LocalTimeParameters(&time).tp_gmt_offset; + PR_NormalizeTime(&time, PR_GMTParameters); + time.tm_params.tp_dst_offset = PR_LocalTimeParameters(&time).tp_dst_offset; + + *aLastModifiedTime = PR_ImplodeTime(&time); + + return NS_OK; +} + +NS_IMETHODIMP nsZipHeader::GetIsSynthetic(bool* aIsSynthetic) { + NS_ASSERTION(mInited, "Not initalised"); + + *aIsSynthetic = false; + return NS_OK; +} + +NS_IMETHODIMP nsZipHeader::GetPermissions(uint32_t* aPermissions) { + NS_ASSERTION(mInited, "Not initalised"); + + // Always give user read access at least, this matches nsIZipReader's + // behaviour + *aPermissions = ((mEAttr >> 16) & 0xfff) | 0x100; + return NS_OK; +} + +nsresult nsZipHeader::Init(const nsACString& aPath, PRTime aDate, + uint32_t aAttr, uint32_t aOffset) { + NS_ASSERTION(!mInited, "Already initalised"); + + PRExplodedTime time; + PR_ExplodeTime(aDate, PR_LocalTimeParameters, &time); + if (time.tm_year < 1980) { + return NS_ERROR_INVALID_ARG; + } + + mTime = time.tm_sec / 2 + (time.tm_min << 5) + (time.tm_hour << 11); + mDate = + time.tm_mday + ((time.tm_month + 1) << 5) + ((time.tm_year - 1980) << 9); + + // Store modification timestamp as extra field + // First fill CDS extra field + mFieldLength = 9; + mExtraField = MakeUnique<uint8_t[]>(mFieldLength); + if (!mExtraField) { + mFieldLength = 0; + } else { + uint32_t pos = 0; + WRITE16(mExtraField.get(), &pos, ZIP_EXTENDED_TIMESTAMP_FIELD); + WRITE16(mExtraField.get(), &pos, 5); + WRITE8(mExtraField.get(), &pos, ZIP_EXTENDED_TIMESTAMP_MODTIME); + WRITE32(mExtraField.get(), &pos, aDate / PR_USEC_PER_SEC); + + // Fill local extra field + mLocalExtraField = MakeUnique<uint8_t[]>(mFieldLength); + if (mLocalExtraField) { + mLocalFieldLength = mFieldLength; + memcpy(mLocalExtraField.get(), mExtraField.get(), mLocalFieldLength); + } + } + + mEAttr = aAttr; + mOffset = aOffset; + mName = aPath; + mComment.Truncate(); + // Claim a UTF-8 path in case it needs it. + mFlags |= FLAGS_IS_UTF8; + mInited = true; + + return NS_OK; +} + +uint32_t nsZipHeader::GetFileHeaderLength() { + return ZIP_FILE_HEADER_SIZE + mName.Length() + mLocalFieldLength; +} + +nsresult nsZipHeader::WriteFileHeader(nsIOutputStream* aStream) { + NS_ASSERTION(mInited, "Not initalised"); + + uint8_t buf[ZIP_FILE_HEADER_SIZE]; + uint32_t pos = 0; + WRITE32(buf, &pos, ZIP_FILE_HEADER_SIGNATURE); + WRITE16(buf, &pos, mVersionNeeded); + WRITE16(buf, &pos, mFlags); + WRITE16(buf, &pos, mMethod); + WRITE16(buf, &pos, mTime); + WRITE16(buf, &pos, mDate); + WRITE32(buf, &pos, mCRC); + WRITE32(buf, &pos, mCSize); + WRITE32(buf, &pos, mUSize); + WRITE16(buf, &pos, mName.Length()); + WRITE16(buf, &pos, mLocalFieldLength); + + nsresult rv = ZW_WriteData(aStream, (const char*)buf, pos); + NS_ENSURE_SUCCESS(rv, rv); + + rv = ZW_WriteData(aStream, mName.get(), mName.Length()); + NS_ENSURE_SUCCESS(rv, rv); + + if (mLocalFieldLength) { + rv = ZW_WriteData(aStream, (const char*)mLocalExtraField.get(), + mLocalFieldLength); + NS_ENSURE_SUCCESS(rv, rv); + } + + return NS_OK; +} + +uint32_t nsZipHeader::GetCDSHeaderLength() { + return ZIP_CDS_HEADER_SIZE + mName.Length() + mComment.Length() + + mFieldLength; +} + +nsresult nsZipHeader::WriteCDSHeader(nsIOutputStream* aStream) { + NS_ASSERTION(mInited, "Not initalised"); + + uint8_t buf[ZIP_CDS_HEADER_SIZE]; + uint32_t pos = 0; + WRITE32(buf, &pos, ZIP_CDS_HEADER_SIGNATURE); + WRITE16(buf, &pos, mVersionMade); + WRITE16(buf, &pos, mVersionNeeded); + WRITE16(buf, &pos, mFlags); + WRITE16(buf, &pos, mMethod); + WRITE16(buf, &pos, mTime); + WRITE16(buf, &pos, mDate); + WRITE32(buf, &pos, mCRC); + WRITE32(buf, &pos, mCSize); + WRITE32(buf, &pos, mUSize); + WRITE16(buf, &pos, mName.Length()); + WRITE16(buf, &pos, mFieldLength); + WRITE16(buf, &pos, mComment.Length()); + WRITE16(buf, &pos, mDisk); + WRITE16(buf, &pos, mIAttr); + WRITE32(buf, &pos, mEAttr); + WRITE32(buf, &pos, mOffset); + + nsresult rv = ZW_WriteData(aStream, (const char*)buf, pos); + NS_ENSURE_SUCCESS(rv, rv); + + rv = ZW_WriteData(aStream, mName.get(), mName.Length()); + NS_ENSURE_SUCCESS(rv, rv); + if (mExtraField) { + rv = ZW_WriteData(aStream, (const char*)mExtraField.get(), mFieldLength); + NS_ENSURE_SUCCESS(rv, rv); + } + return ZW_WriteData(aStream, mComment.get(), mComment.Length()); +} + +nsresult nsZipHeader::ReadCDSHeader(nsIInputStream* stream) { + NS_ASSERTION(!mInited, "Already initalised"); + + uint8_t buf[ZIP_CDS_HEADER_SIZE]; + + nsresult rv = ZW_ReadData(stream, (char*)buf, ZIP_CDS_HEADER_SIZE); + NS_ENSURE_SUCCESS(rv, rv); + + uint32_t pos = 0; + uint32_t signature = READ32(buf, &pos); + if (signature != ZIP_CDS_HEADER_SIGNATURE) return NS_ERROR_FILE_CORRUPTED; + + mVersionMade = READ16(buf, &pos); + mVersionNeeded = READ16(buf, &pos); + mFlags = READ16(buf, &pos); + mMethod = READ16(buf, &pos); + mTime = READ16(buf, &pos); + mDate = READ16(buf, &pos); + mCRC = READ32(buf, &pos); + mCSize = READ32(buf, &pos); + mUSize = READ32(buf, &pos); + uint16_t namelength = READ16(buf, &pos); + mFieldLength = READ16(buf, &pos); + uint16_t commentlength = READ16(buf, &pos); + mDisk = READ16(buf, &pos); + mIAttr = READ16(buf, &pos); + mEAttr = READ32(buf, &pos); + mOffset = READ32(buf, &pos); + + if (namelength > 0) { + auto field = MakeUnique<char[]>(namelength); + NS_ENSURE_TRUE(field, NS_ERROR_OUT_OF_MEMORY); + rv = ZW_ReadData(stream, field.get(), namelength); + NS_ENSURE_SUCCESS(rv, rv); + mName.Assign(field.get(), namelength); + } else + mName.Truncate(); + + if (mFieldLength > 0) { + mExtraField = MakeUnique<uint8_t[]>(mFieldLength); + NS_ENSURE_TRUE(mExtraField, NS_ERROR_OUT_OF_MEMORY); + rv = ZW_ReadData(stream, (char*)mExtraField.get(), mFieldLength); + NS_ENSURE_SUCCESS(rv, rv); + } + + if (commentlength > 0) { + auto field = MakeUnique<char[]>(commentlength); + NS_ENSURE_TRUE(field, NS_ERROR_OUT_OF_MEMORY); + rv = ZW_ReadData(stream, field.get(), commentlength); + NS_ENSURE_SUCCESS(rv, rv); + mComment.Assign(field.get(), commentlength); + } else + mComment.Truncate(); + + mInited = true; + return NS_OK; +} + +const uint8_t* nsZipHeader::GetExtraField(uint16_t aTag, bool aLocal, + uint16_t* aBlockSize) { + const uint8_t* buf = aLocal ? mLocalExtraField.get() : mExtraField.get(); + uint32_t buflen = aLocal ? mLocalFieldLength : mFieldLength; + uint32_t pos = 0; + uint16_t tag, blocksize; + + while (buf && (pos + 4) <= buflen) { + tag = READ16(buf, &pos); + blocksize = READ16(buf, &pos); + + if (aTag == tag && (pos + blocksize) <= buflen) { + *aBlockSize = blocksize; + return buf + pos - 4; + } + + pos += blocksize; + } + + return nullptr; +} + +/* + * Pad extra field to align data starting position to specified size. + */ +nsresult nsZipHeader::PadExtraField(uint32_t aOffset, uint16_t aAlignSize) { + uint32_t pad_size; + uint32_t pa_offset; + uint32_t pa_end; + + // Check for range and power of 2. + if (aAlignSize < 2 || aAlignSize > 32768 || + (aAlignSize & (aAlignSize - 1)) != 0) { + return NS_ERROR_INVALID_ARG; + } + + // Point to current starting data position. + aOffset += ZIP_FILE_HEADER_SIZE + mName.Length() + mLocalFieldLength; + + // Calculate aligned offset. + pa_offset = aOffset & ~(aAlignSize - 1); + pa_end = pa_offset + aAlignSize; + pad_size = pa_end - aOffset; + if (pad_size == 0) { + return NS_OK; + } + + // Leave enough room(at least 4 bytes) for valid values in extra field. + while (pad_size < 4) { + pad_size += aAlignSize; + } + // Extra field length is 2 bytes. + if (mLocalFieldLength + pad_size > 65535) { + return NS_ERROR_FAILURE; + } + + UniquePtr<uint8_t[]> field = std::move(mLocalExtraField); + uint32_t pos = mLocalFieldLength; + + mLocalExtraField = MakeUnique<uint8_t[]>(mLocalFieldLength + pad_size); + memcpy(mLocalExtraField.get(), field.get(), mLocalFieldLength); + // Use 0xFFFF as tag ID to avoid conflict with other IDs. + // For more information, please read "Extensible data fields" section in: + // http://www.pkware.com/documents/casestudies/APPNOTE.TXT + WRITE16(mLocalExtraField.get(), &pos, 0xFFFF); + WRITE16(mLocalExtraField.get(), &pos, pad_size - 4); + memset(mLocalExtraField.get() + pos, 0, pad_size - 4); + mLocalFieldLength += pad_size; + + return NS_OK; +} |