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@@ -0,0 +1,181 @@ |
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#define _GNU_SOURCE |
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#include <stdbool.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#ifndef BUFSIZE |
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#define BUFSIZE 1048576 |
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#endif |
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#define STATE_BEFORE_RECORD 0 |
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#define STATE_RESPONSE_RECORD 1 |
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#define STATE_OTHER_RECORD 2 |
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#ifdef DEBUG |
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#define DEBUG_PRINTF(...) do { fprintf(stderr, __VA_ARGS__); } while (false) |
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#else |
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#define DEBUG_PRINTF(...) do {} while (false) |
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#endif |
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int main(int argc, char* argv[]) { |
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//TODO --meta or a similar way to get something like that? |
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// Read stdin, decode WARC, dump all response record bodies to stdout. |
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// One LF is inserted at the end of each response to ensure that a new record always begins on a new line. |
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// Headers must fit into BUFSIZE. |
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char buf[2 * BUFSIZE]; |
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size_t n; |
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int state = STATE_BEFORE_RECORD; |
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char* m0; |
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char* m1; |
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size_t record_bytes_read; |
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size_t record_length; |
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size_t nscan; |
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while ((n = fread(buf, 1, BUFSIZE, stdin)) > 0) { |
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checkstate: |
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DEBUG_PRINTF("Have %zu bytes of buffer (at %p)\n", n, (void*)&buf); |
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if (n == 0) { |
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break; |
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} |
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DEBUG_PRINTF("State: %d\n", state); |
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if (state == STATE_BEFORE_RECORD) { |
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if (n < 10) { |
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fprintf(stderr, "Error: too little data before WARC headers"); |
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return 1; |
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} |
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if (memcmp(buf, "WARC/1.0\r\n", 10) == 0 || memcmp(buf, "WARC/1.1\r\n", 10) == 0) { |
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// Got some headers; find the record type, content length, and end of headers |
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m0 = memmem(buf, n, "\r\nContent-Length:", 17); |
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if (!m0) { |
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fprintf(stderr, "Error: Content-Length missing"); |
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return 1; |
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} |
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DEBUG_PRINTF("Found Content-Length header at %p (offset %zu)\n", (void*)(m0 + 2), m0 + 2 - buf); |
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m1 = memmem(m0 + 1, n - (m0 + 1 - buf), "\r\n", 2); |
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if (!m1) { |
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fprintf(stderr, "Error: CRLF after Content-Length missing"); |
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return 1; |
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} |
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m0 += 17; |
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while (m0 < buf + n && (*m0 == ' ' || *m0 == '\t')) ++m0; |
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if (!sscanf(m0, "%zu%n", &record_length, &nscan)) { |
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fprintf(stderr, "Error: invalid Content-Length"); |
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return 1; |
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} |
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if (nscan > n - (m0 - buf)) { |
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fprintf(stderr, "Error: buffer overread"); |
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return 1; |
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} |
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m0 += nscan; |
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while (m0 < buf + n && (*m0 == ' ' || *m0 == '\t')) ++m0; |
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if (m0 != m1) { |
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fprintf(stderr, "Error: invalid Content-Length (noise before EOL)"); |
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return 1; |
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} |
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DEBUG_PRINTF("Record body length: %zu\n", record_length); |
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m0 = memmem(buf, n, "\r\nWARC-Type:", 12); |
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if (!m0) { |
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fprintf(stderr, "Error: WARC-Type missing"); |
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return 1; |
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} |
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DEBUG_PRINTF("Found WARC-Type header at %p (offset %zu)\n", (void*)(m0 + 2), m0 + 2 - buf); |
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m1 = memmem(m0, n - (m0 - buf), "\r\n", 2); |
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if (!m1) { |
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fprintf(stderr, "Error: CRLF after WARC-Type missing"); |
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return 1; |
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} |
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m0 += 12; |
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while (m0 < buf + n && (*m0 == ' ' || *m0 == '\t')) ++m0; |
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if (memcmp(m0, "response", 8) == 0) { |
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DEBUG_PRINTF("Response record\n"); |
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state = STATE_RESPONSE_RECORD; |
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} else { |
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DEBUG_PRINTF("Other record\n"); |
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state = STATE_OTHER_RECORD; |
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} |
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m0 = memmem(buf, n, "\r\n\r\n", 4); |
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if (!m0) { |
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fprintf(stderr, "Error: end of headers not found"); |
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return 1; |
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} |
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m0 += 4; |
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DEBUG_PRINTF("Record body begins at %p (offset %zu)\n", (void*)m0, m0 - buf); |
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//TODO Replace all the memmove business with pointer logic to avoid needless constant memory copying (is more wrooom). |
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DEBUG_PRINTF("Moving %zu bytes backwards by %zu\n", n - (m0 - buf), m0 - buf); |
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memmove(buf, m0, n - (m0 - buf)); |
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n = n - (m0 - buf); |
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record_bytes_read = 0; |
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goto checkstate; |
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// Previous code for this case, but the state handling below should do the same thing with less duplication |
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/* |
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if (record_length + 4 > n - (m0 - buf)) { |
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// The whole record isn't in this buffer, print what we have and continue with the loop. |
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if (state == STATE_RESPONSE_RECORD) { |
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fwrite(m0, 1, n - (m0 - buf), stdout); |
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} |
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record_bytes_read = n - (m0 - buf); |
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} else { |
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// The buffer contains the entire record. Print it, then adjust buf and go back to the beginning of the state processing. |
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if (state == STATE_RESPONSE_RECORD) { |
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fwrite(m0, 1, record_length, stdout); |
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} |
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if (memcmp(m0 + record_length, "\r\n\r\n", 4) != 0) { |
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fprintf(stderr, "Error: end of block not found"); |
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return 1; |
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} |
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m0 += record_length + 4; |
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memmove(buf, m0, n - (m0 - buf)); |
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n = n - (m0 - buf); |
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// Fill the buffer back up to ensure that there's at least BUFSIZE bytes in the buffer so the next iteration has the full headers of the next record |
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if (n < BUFSIZE) { |
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n += fread(buf + n, 1, BUFSIZE, stdin); |
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} |
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state = STATE_BEFORE_RECORD; |
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goto checkstate; |
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} |
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*/ |
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} else { |
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fprintf(stderr, "Error: expected header line, got something else\n"); |
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return 1; |
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} |
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} else if (state == STATE_RESPONSE_RECORD || state == STATE_OTHER_RECORD) { |
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if (record_length + 4 - record_bytes_read > n) { |
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// Only got part of the record body |
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DEBUG_PRINTF("Partial record\n"); |
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if (state == STATE_RESPONSE_RECORD) { |
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DEBUG_PRINTF("Copying %zu bytes to stdout\n", n); |
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fwrite(buf, 1, n, stdout); |
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} |
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record_bytes_read += n; |
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DEBUG_PRINTF("%zu of %zu bytes from this record written\n", record_bytes_read, record_length); |
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} else { |
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// Remainder of the record is in the buffer. Same logic as above for small records fitting in the buffer with the headers. |
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DEBUG_PRINTF("Full record\n"); |
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if (state == STATE_RESPONSE_RECORD) { |
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DEBUG_PRINTF("Copying %zu bytes to stdout\n", record_length - record_bytes_read); |
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fwrite(buf, 1, record_length - record_bytes_read, stdout); |
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fprintf(stdout, "\n"); |
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} |
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if (memcmp(buf + record_length - record_bytes_read, "\r\n\r\n", 4) != 0) { |
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fprintf(stderr, "Error: end of block not found"); |
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return 1; |
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} |
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DEBUG_PRINTF("Moving %zu bytes backwards by %zu\n", n - (record_length + 4 - record_bytes_read), record_length + 4 - record_bytes_read); |
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memmove(buf, buf + record_length + 4 - record_bytes_read, n - (record_length + 4 - record_bytes_read)); |
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n = n - (record_length + 4 - record_bytes_read); |
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if (n < BUFSIZE) { |
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DEBUG_PRINTF("Refilling buffer\n"); |
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n += fread(buf + n, 1, BUFSIZE, stdin); |
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} |
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state = STATE_BEFORE_RECORD; |
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goto checkstate; |
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} |
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} |
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} |
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} |