74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
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#include <k/iso9660.h>
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#include <k/types.h>
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#include "atapi.h"
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#include "fd.h"
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#include "iso.h"
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#include "stdio.h"
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#include "string.h"
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static u32 get_filename_length(const char *path, u32 *index)
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{
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u32 len = 0;
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for (; path[*index]; ++(*index))
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{
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if (path[*index] != '/')
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++len;
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else {
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while (path[*index] == '/')
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++(*index);
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break;
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}
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}
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return len;
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}
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int open(const char *pathname, int flags)
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{
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if (flags != O_RDONLY)
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return -1;
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struct iso_prim_voldesc *iso_prim_block = read_block(ISO_PRIM_VOLDESC_BLOCK);
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if (strncmp(iso_prim_block->std_identifier, "CD001", 5))
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return -1;
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struct iso_dir *root = &iso_prim_block->root_dir;
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struct iso_dir *curr = read_block(root->data_blk.le);
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u32 index = 0;
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while (pathname[index] == '/')
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++index;
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for (int depth = 0; depth < MAX_DIR_DEPTH; ++depth)
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{
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char found = 0;
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u32 start = index;
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u32 length = get_filename_length(pathname, &index);
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// we found the file
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if (!length)
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return register_fd(curr->data_blk.le);
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// iteration for one directory
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while (curr->dir_size != 0)
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{
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if (length == curr->idf_len &&
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!strncmp(pathname + start, curr->idf, length))
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{
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curr = read_block(curr->data_blk.le);
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found = 1;
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break;
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}
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else
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curr = (void *)curr + curr->dir_size;
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}
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if (!found)
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return -1;
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}
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return -1;
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}
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