xref: /aosp_15_r20/external/zlib/patches/0016-minizip-parse-unicode-path-extra-field.patch (revision 86ee64e75fa5f8bce2c8c356138035642429cd05)

commit c8834821f452a3d424edd0ed2a1e9ceeda38d0ea
Author: Alex Danilo <[email protected]>
Date:   Thu May 12 03:29:52 2022 +0000

    Extract: Parse Unicode Path Extra field in minizip

    Adds parsing of the Info-ZIP Extra field which overrides the
    file name in the File Header only if the CRC in the extra field
    is a CRC of the file name in the File Header.

    See https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT
    section 4.6.9 for reference.

    Also tidied up some whitespace indent.

    Bug: 953256, 953599
    Tests: Manually tested, auto test in follow on CL
    Change-Id: I1283dcb88a203c3bb56c1d9c504035a2e51aecbd
    Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3641742
    Reviewed-by: Noel Gordon <[email protected]>
    Commit-Queue: Alex Danilo <[email protected]>
    Cr-Commit-Position: refs/heads/main@{#1002476}

diff --git a/third_party/zlib/contrib/minizip/unzip.c b/third_party/zlib/contrib/minizip/unzip.c
index c8a01b23efd42..42677cff82c96 100644
--- a/third_party/zlib/contrib/minizip/unzip.c
+++ b/third_party/zlib/contrib/minizip/unzip.c
@@ -193,6 +193,26 @@ typedef struct
    Reads a long in LSB order from the given gz_stream. Sets
 */

+local int unz64local_getByte(const zlib_filefunc64_32_def* pzlib_filefunc_def,
+                             voidpf filestream,
+                             int *pi) {
+    unsigned char c;
+    int err = (int)ZREAD64(*pzlib_filefunc_def,filestream,&c,1);
+    if (err==1)
+    {
+        *pi = (int)c;
+        return UNZ_OK;
+    }
+    else
+    {
+        *pi = 0;
+        if (ZERROR64(*pzlib_filefunc_def,filestream))
+            return UNZ_ERRNO;
+        else
+            return UNZ_EOF;
+    }
+}
+
 local int unz64local_getShort(const zlib_filefunc64_32_def* pzlib_filefunc_def,
                               voidpf filestream,
                               uLong *pX) {
@@ -948,6 +968,62 @@ local int unz64local_GetCurrentFileInfoInternal(unzFile file,
                 }

             }
+            else if (headerId == 0x7075) /* Info-ZIP Unicode Path Extra Field */
+            {
+                int version = 0;
+
+                if (unz64local_getByte(&s->z_filefunc, s->filestream, &version) != UNZ_OK)
+                {
+                    err = UNZ_ERRNO;
+                }
+                if (version != 1)
+                {
+                    if (ZSEEK64(s->z_filefunc, s->filestream,dataSize - 1, ZLIB_FILEFUNC_SEEK_CUR) != 0)
+                    {
+                        err = UNZ_ERRNO;
+                    }
+                }
+                else
+                {
+                    uLong uCrc, uHeaderCrc, fileNameSize;
+
+                    if (unz64local_getLong(&s->z_filefunc, s->filestream, &uCrc) != UNZ_OK)
+                    {
+                        err = UNZ_ERRNO;
+                    }
+                    uHeaderCrc = crc32(0, (const unsigned char *)szFileName, file_info.size_filename);
+                    fileNameSize = dataSize - (2 * sizeof (short) + 1);
+                    /* Check CRC against file name in the header. */
+                    if (uHeaderCrc != uCrc)
+                    {
+                        if (ZSEEK64(s->z_filefunc, s->filestream, fileNameSize, ZLIB_FILEFUNC_SEEK_CUR) != 0)
+                        {
+                            err = UNZ_ERRNO;
+                        }
+                    }
+                    else
+                    {
+                        uLong uSizeRead;
+
+                        if (fileNameSize < fileNameBufferSize)
+                        {
+                             *(szFileName + fileNameSize) = '\0';
+                            uSizeRead = fileNameSize;
+                        }
+                        else
+                        {
+                            uSizeRead = fileNameBufferSize;
+                        }
+                        if ((fileNameSize > 0) && (fileNameBufferSize > 0))
+                        {
+                            if (ZREAD64(s->z_filefunc, s->filestream, szFileName, uSizeRead) != uSizeRead)
+                            {
+                                err = UNZ_ERRNO;
+                            }
+                        }
+                    }
+                }
+            }
             else
             {
                 if (ZSEEK64(s->z_filefunc, s->filestream,dataSize,ZLIB_FILEFUNC_SEEK_CUR)!=0)