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preliminary support of uncompress on-the-fly

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This commit is contained in:
Laurent Vivier 2005-06-09 22:13:21 +00:00
parent 406f252a78
commit c2746c0b56
1 changed files with 42 additions and 3 deletions
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45
second/load.c
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@ -80,15 +80,44 @@ int load_image(unsigned long offset, unsigned long size, char *image)
#endif
}
static unsigned char* gzip_image;
#ifdef SCSI_SUPPORT
unsigned char load_get_byte(unsigned long inptr)
{
return gzip_image[inptr];
}
#else
static unsigned long buffer_size;
static unsigned long remaining_size;
static unsigned long buffer_offset;
static unsigned long disk_offset;
#define MIN(a,b) ((a) < (b) ? (a) : (b))
unsigned char load_get_byte(unsigned long inptr)
{
if (buffer_offset == buffer_size)
{
unsigned to_read = MIN(buffer_size, remaining_size);
load_image(disk_offset, to_read, gzip_image);
buffer_offset = 0;
remaining_size -= to_read;
disk_offset += to_read;
}
return gzip_image[buffer_offset++];
}
#endif
int load_gzip(unsigned long offset, unsigned long size, char *image)
{
char* gzip_image;
#ifdef SCSI_SUPPORT
int ret;
/* allocate memory for image */
gzip_image = (char*)malloc(size);
if (gzip_image == NULL)
return -1;
@ -97,10 +126,20 @@ int load_gzip(unsigned long offset, unsigned long size, char *image)
ret = load_image(offset, size, gzip_image);
if (ret == -1)
return -1;
#else
disk_offset = offset;
buffer_size = size;
remaining_size = size;
buffer_size = 512 * 18 * 2;
buffer_offset = buffer_size;
gzip_image = (char*)malloc(buffer_size);
if (gzip_image == NULL)
return -1;
#endif
/* uncompress */
uncompress(image, gzip_image);
uncompress(image, load_get_byte);
printf("\n");
/* free kernel image */