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72 lines
1.3 KiB
C
72 lines
1.3 KiB
C
/*
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*
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* (c) 2005 Laurent Vivier <LaurentVivier@wanadoo.fr>
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*
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*/
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#include <string.h>
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#include <stdio.h>
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#include "libiso9660.h"
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extern iso9660_read_t __iso9660_device_read;
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ssize_t iso9660_read(iso9660_FILE *file, void *buf, size_t count)
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{
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size_t read = 0;
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while (count > 0)
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{
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size_t part;
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/* direct i/o */
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if ( (file->index == sizeof (file->buffer)) &&
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(count > sizeof (file->buffer)) )
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{
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int extents;
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if (file->len < count)
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extents = file->len / sizeof(file->buffer);
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else
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extents = count / sizeof (file->buffer);
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part = extents * sizeof (file->buffer);
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__iso9660_device_read(file->extent,
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buf + read, part);
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file->len -= part;
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file->extent += extents;
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count -= part;
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read += part;
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continue;
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}
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if (file->index == sizeof (file->buffer))
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{
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if (file->len <= 0)
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return read;
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__iso9660_device_read(file->extent,
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file->buffer,
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sizeof (file->buffer));
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file->len -= sizeof (file->buffer);
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file->extent++;
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file->index = 0;
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}
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if (count > sizeof(file->buffer) - file->index)
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part = sizeof(file->buffer) - file->index;
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else
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part = count;
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memcpy(buf + read, file->buffer + file->index, part);
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count -= part;
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file->index += part;
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read += part;
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}
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return read;
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}
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