From 063038bcef39802aa65c196a162067f66e5c8621 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Rafa=C5=82=20Mi=C5=82ecki?= Date: Fri, 10 Sep 2021 16:34:47 +0200 Subject: [PATCH] bcm4908img: store offset of tail data MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit This simplifies some operations as it doesn't have to be caculated over and over. It will also allow adding support for more vendor formats. Signed-off-by: Rafał Miłecki --- package/utils/bcm4908img/Makefile | 2 +- package/utils/bcm4908img/src/bcm4908img.c | 23 +++++++++++++---------- 2 files changed, 14 insertions(+), 11 deletions(-) diff --git a/package/utils/bcm4908img/Makefile b/package/utils/bcm4908img/Makefile index c18ac958f8..ff504a8078 100644 --- a/package/utils/bcm4908img/Makefile +++ b/package/utils/bcm4908img/Makefile @@ -3,7 +3,7 @@ include $(TOPDIR)/rules.mk PKG_NAME:=bcm4908img -PKG_RELEASE:=1 +PKG_RELEASE:=2 PKG_FLAGS:=nonshared diff --git a/package/utils/bcm4908img/src/bcm4908img.c b/package/utils/bcm4908img/src/bcm4908img.c index 402d317190..f2023ced9f 100644 --- a/package/utils/bcm4908img/src/bcm4908img.c +++ b/package/utils/bcm4908img/src/bcm4908img.c @@ -79,11 +79,11 @@ struct bcm4908img_tail { * 6. BCM4908 tail */ struct bcm4908img_info { - size_t file_size; size_t cferom_offset; size_t bootfs_offset; size_t padding_offset; size_t rootfs_offset; + size_t tail_offset; uint32_t crc32; /* Calculated checksum */ struct bcm4908img_tail tail; }; @@ -219,7 +219,7 @@ static int bcm4908img_calc_crc32(FILE *fp, struct bcm4908img_info *info) { fseek(fp, info->cferom_offset, SEEK_SET); info->crc32 = 0xffffffff; - length = info->file_size - info->cferom_offset - sizeof(struct bcm4908img_tail); + length = info->tail_offset - info->cferom_offset; while (length && (bytes = fread(buf, 1, bcm4908img_min(sizeof(buf), length), fp)) > 0) { info->crc32 = bcm4908img_crc32(info->crc32, buf, bytes); length -= bytes; @@ -267,6 +267,7 @@ static int bcm4908img_parse(FILE *fp, struct bcm4908img_info *info) { struct chk_header *chk; struct stat st; uint8_t buf[1024]; + size_t file_size; uint16_t tmp16; size_t length; size_t bytes; @@ -281,7 +282,9 @@ static int bcm4908img_parse(FILE *fp, struct bcm4908img_info *info) { fprintf(stderr, "Failed to fstat: %d\n", err); return err; } - info->file_size = st.st_size; + file_size = st.st_size; + + info->tail_offset = file_size - sizeof(*tail); /* Vendor formats */ @@ -297,7 +300,7 @@ static int bcm4908img_parse(FILE *fp, struct bcm4908img_info *info) { /* Offsets */ for (info->bootfs_offset = info->cferom_offset; - info->bootfs_offset < info->file_size; + info->bootfs_offset < info->tail_offset; info->bootfs_offset += 0x20000) { if (fseek(fp, info->bootfs_offset, SEEK_SET)) { err = -errno; @@ -311,13 +314,13 @@ static int bcm4908img_parse(FILE *fp, struct bcm4908img_info *info) { if (be16_to_cpu(tmp16) == 0x8519) break; } - if (info->bootfs_offset >= info->file_size) { + if (info->bootfs_offset >= info->tail_offset) { fprintf(stderr, "Failed to find bootfs offset\n"); return -EPROTO; } for (info->rootfs_offset = info->bootfs_offset; - info->rootfs_offset < info->file_size; + info->rootfs_offset < info->tail_offset; info->rootfs_offset += 0x20000) { uint32_t *magic = (uint32_t *)&buf[0]; @@ -340,7 +343,7 @@ static int bcm4908img_parse(FILE *fp, struct bcm4908img_info *info) { if (be32_to_cpu(*magic) == UBI_EC_HDR_MAGIC) break; } - if (info->rootfs_offset >= info->file_size) { + if (info->rootfs_offset >= info->tail_offset) { fprintf(stderr, "Failed to find rootfs offset\n"); return -EPROTO; } @@ -351,7 +354,7 @@ static int bcm4908img_parse(FILE *fp, struct bcm4908img_info *info) { fseek(fp, info->cferom_offset, SEEK_SET); info->crc32 = 0xffffffff; - length = info->file_size - info->cferom_offset - sizeof(*tail); + length = info->tail_offset - info->cferom_offset; while (length && (bytes = fread(buf, 1, bcm4908img_min(sizeof(buf), length), fp)) > 0) { info->crc32 = bcm4908img_crc32(info->crc32, buf, bytes); length -= bytes; @@ -617,10 +620,10 @@ static int bcm4908img_extract(int argc, char **argv) { length = (info.padding_offset ? info.padding_offset : info.rootfs_offset) - offset; } else if (!strcmp(type, "rootfs")) { offset = info.rootfs_offset; - length = info.file_size - offset - sizeof(struct bcm4908img_tail); + length = info.tail_offset - offset; } else if (!strcmp(type, "firmware")) { offset = info.bootfs_offset; - length = info.file_size - offset - sizeof(struct bcm4908img_tail); + length = info.tail_offset - offset; } else { err = -EINVAL; fprintf(stderr, "Unsupported extract type: %s\n", type); -- 2.30.2