Timeline for Struggling with recover.c
Current License: CC BY-SA 3.0
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| Jan 4, 2017 at 13:27 | history | edited | Shaw Ankush | CC BY-SA 3.0 |
added 102 characters in body
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| Jan 4, 2017 at 7:25 | comment | added | Blauelf | Sscanf is for parsing text representations of data, not binary! | |
| Jan 4, 2017 at 5:38 | comment | added | Shaw Ankush | Thank you so much! just one more thing => If I use sscanf to read from the tempstorage's pointee into the first int of type uint32_t then also it would read the first 32 bits and then I could check it against the number 0Xffd8ffe0-ef. What potential error can sscanf incur? | |
| Jan 3, 2017 at 10:11 | comment | added | Blauelf |
scanf and printf is for interpreting or formatting content, it's for text-based formats, not for binary. If there was a number 67 stored as those two digit characters, you'd use scanf, but if it is stored as ASCII character C (has value 67, 'C' == 67 is true), you'd interpret it as a byte, an 8-bit integer, using functions like fread or fgetc.
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| Jan 3, 2017 at 10:07 | answer | added | Blauelf | timeline score: 0 | |
| Jan 2, 2017 at 19:03 | history | edited | Shaw Ankush | CC BY-SA 3.0 |
added 187 characters in body
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| Jan 2, 2017 at 19:02 | comment | added | Shaw Ankush | Thanks for the help. I did those changes. I ran it in gdb and the check(now firstint) keeps changing its value but it never achieves any value between that range and hence program ends without generating any jpgs. I have updated the source code. Please take a look. And also can you explain why you asked to avoid using scanf and fprintfs. | |
| Jan 2, 2017 at 12:06 | comment | added | Blauelf |
A float makes no sense to me. An uint32_t however would (like uint32_t check = *((uint32_t*) tempstorage);, just not with scanf). You'd have to write full 512 bytes, not 508, and do not by any means fprintf. You fclose tempjpgg without checking whether one is open. Your for loop might better use !feof(sdcard), not without the !
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| Dec 28, 2016 at 13:49 | history | asked | Shaw Ankush | CC BY-SA 3.0 |