intelvbttool: Add support for reading vbt from sysfs
VBT on Intel(R) systems is available via sysfs as /sys/kernel/debug/dri/0/i915_vbt However the size of this file reads as 0 causing intelvbttool to fail. This patch implements incremental reads with realloc for such cases or whenever the file size is not available (e.g. reading from stdin). After this patch is applied, intelvbttool can be used as follows: sudo intelvbttool -f /sys/kernel/debug/dri/0/i915_vbt -d Change-Id: I5d17095a5747550b7115a54a7619b7294a846196 Signed-off-by: Alex Feinman <alexfeinman@hotmail.com> Reviewed-on: https://review.coreboot.org/c/31531 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Nico Huber <nico.h@gmx.de>
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@ -29,6 +29,7 @@ typedef uint8_t u8;
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typedef uint16_t u16;
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typedef uint32_t u32;
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#define DEF_ALLOC 1024
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typedef struct {
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u16 signature;
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@ -380,39 +381,33 @@ static struct fileobject *malloc_fo_sub(const struct fileobject *old,
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static struct fileobject *read_file(const char *filename)
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{
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FILE *fd = fopen(filename, "rb");
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off_t read_size = DEF_ALLOC;
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if (!fd) {
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printerr("%s open failed: %s\n", filename, strerror(errno));
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return NULL;
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}
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if (fseek(fd, 0, SEEK_END)) {
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printerr("%s seek failed: %s\n", filename, strerror(errno));
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fclose(fd);
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return NULL;
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}
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const off_t size = ftell(fd);
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if (size < 0 || size > SIZE_MAX) {
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printerr("%s tell failed: %s\n", filename, strerror(errno));
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fclose(fd);
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return NULL;
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}
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if (fseek(fd, 0, SEEK_SET)) {
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printerr("%s seek failed: %s\n", filename, strerror(errno));
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fclose(fd);
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return NULL;
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}
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struct fileobject *fo = malloc_fo(size);
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struct fileobject *fo = malloc_fo(read_size);
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if (!fo) {
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printerr("malloc failed\n");
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fclose(fd);
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return NULL;
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}
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if (fread(fo->data, 1, size, fd) != size) {
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off_t total_bytes_read = 0, bytes_read;
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while ((bytes_read = fread(fo->data + total_bytes_read, 1, read_size, fd)) > 0) {
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total_bytes_read += bytes_read;
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struct fileobject *newfo = remalloc_fo(fo, fo->size + read_size);
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if (!newfo) {
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fclose(fd);
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free_fo(fo);
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return NULL;
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}
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fo = newfo;
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}
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if (!total_bytes_read) {
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fclose(fd);
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free_fo(fo);
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return NULL;
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@ -424,7 +419,7 @@ static struct fileobject *read_file(const char *filename)
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return NULL;
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}
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fo->size = size;
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fo->size = total_bytes_read;
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return fo;
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}
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