add a one-argument version of package_extract_file

Add a version of package_extract_file that returns the file data as
its return value (to be consumed by some other edify function that
expects to receive a bunch of binary data as an argument).  Lets us
avoid having two copies of a big file in memory (extracting it into
/tmp, which is a ramdisk, and then having something load it into
memory) when doing things like radio updates.

Change-Id: Ie26ece5fbae457eb0ddcd8a13d74d78a769fbc70

1 files changed, 7 insertions, 0 deletions

diff --git a/minzip/Zip.h b/minzip/Zip.h
index 1c1df2f..9f99fba 100644
--- a/minzip/Zip.h
+++ b/minzip/Zip.h
@@ -169,6 +169,13 @@ bool mzExtractZipEntryToFile(const ZipArchive *pArchive,
     const ZipEntry *pEntry, int fd);
 
 /*
+ * Inflate and write an entry to a memory buffer, which must be long
+ * enough to hold mzGetZipEntryUncomplen(pEntry) bytes.
+ */
+bool mzExtractZipEntryToBuffer(const ZipArchive *pArchive,
+    const ZipEntry *pEntry, unsigned char* buffer);
+
+/*
  * Inflate all entries under zipDir to the directory specified by
  * targetDir, which must exist and be a writable directory.
  *