cbfs: add cbfs_read()
Allow for reading from cbfs media without having a handle to a non-CBFS_DEFAULT_MEDIA cbfs_media. In conjunction with cbfs_locate_file() one can locate and cbfs_read() a file without bringing the entire file through a potentially temporary buffer (non-memory-mappable cbfs media platforms). BUG=chrome-os-partner:29922 BRANCH=None TEST=Built. Original-Change-Id: Ib5d965334bce1267650fc23c9e9f496675cf8450 Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/205991 Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org> (cherry picked from commit 85200f28863e5ea8888322f5787dc6de9a2999f0) Signed-off-by: Marc Jones <marc.jones@se-eng.com> Change-Id: I25e3221beefd0155305ad63da6be9f47e756f7d0 Reviewed-on: http://review.coreboot.org/8181 Tested-by: build bot (Jenkins) Reviewed-by: Furquan Shaikh <furquan@google.com>
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@ -224,6 +224,10 @@ struct cbfs_media {
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ssize_t cbfs_locate_file(struct cbfs_media *media, struct cbfs_file *file,
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const char *name);
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/* Read count bytes at offset into dest. Return number of bytes read. */
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size_t cbfs_read(struct cbfs_media *media, void *dest, size_t offset,
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size_t count);
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/* returns pointer to a file entry inside CBFS or NULL */
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struct cbfs_file *cbfs_get_file(struct cbfs_media *media, const char *name);
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@ -194,6 +194,22 @@ ssize_t cbfs_locate_file(struct cbfs_media *media, struct cbfs_file *file,
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return -1;
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}
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size_t cbfs_read(struct cbfs_media *media, void *dest, size_t offset,
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size_t count)
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{
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struct cbfs_media default_media;
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size_t nread;
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if (init_media(&media, &default_media))
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return 0;
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media->open(media);
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nread = media->read(media, dest, offset, count);
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media->close(media);
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return nread;
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}
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struct cbfs_file *cbfs_get_file(struct cbfs_media *media, const char *name)
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{
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struct cbfs_media default_media;
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